JPH0249603Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a projector type vehicle headlamp.

[Conventional technology]

Automobile headlights must have a light distribution pattern that brightly illuminates the area in front of the vehicle's own lane and does not dazzle oncoming vehicles.

A projector-type automobile headlamp has been proposed as a headlamp that has light distribution characteristics that meet the above requirements, has a simple lens configuration, and can be made compact in overall size. As the latest technology regarding this projector type headlamp, for example, Japanese Patent Application Laid-Open No. 58-209801 is known.

FIG. 6 shows the above-mentioned known projector type headlamp. The headlight of this known example is provided with a shell-shaped reflector, and the axial cross section of the inner reflective surface of this reflector each forms a part of an ellipse, and the eccentricity of the ellipse is perpendicular to the axial direction. In a vehicle headlamp increasing from the longitudinal section to the axially horizontal longitudinal section, the elliptical portion 10 of every axial section
The focal points 105 of 1,102 and the corresponding vertices 104 of the elliptical portions 101, 102 of all axial sections coincide.

110 is the outer focus of the ellipse 102, 110 is a light shielding plate-like dimmer, 112 is the outer focus of the ellipse 101,
113 is a lens.

FIG. 7 is a plan view schematically depicting an example of this type of projector type headlamp, FIG. 8 is a side view, and FIG. 9 is a front view.

1 is a concave mirror, and F is its focal point. The light source bulb 2 is provided so that the filament is located near the focal point F mentioned above.

A convex lens 3 is provided to share the optical axis Z with the concave mirror 1 described above.

I-j drawn in FIG. 7 shows the meridional image plane of the convex lens 3, which emits light from the light source and passes through the concave mirror 1.
The light reflected by the lens enters this meridional image plane.

The above incident light is modulated by the convex lens 3 and projected forward (to the right in FIGS. 7 and 8).

If a screen is provided near the meridional image plane and the light distribution pattern is represented by an isoluminous curve, the 10th
It will look like the figure. H-H is a horizontal line on the screen, and V-V is also a vertical line.

As shown in FIGS. 7 to 9, a shade 4 having an edge along the meridional image plane is provided. Specifically, as shown in 4a shown in FIG. 9, a cut line 4a is formed so as to recede from the meridional image plane ij. FIG. 10 also shows how the light distribution pattern described above and the shade 4 overlap. Book 1
As shown in Figure 0, the upper half of the light beam passes through. Although most of the lower half is blocked, light is allowed to pass through the portion corresponding to the cut line 4a.

As the partially covered light beams as described above are focused on the meridional image planes ij and intersect with each other, the light beams projected in front of the headlight have a pattern that is an inversion of the one shown in Figure 10. form. FIG. 11 is an explanatory diagram showing the general shape of a light projection pattern using isoluminance curves on a screen provided in front of the headlight.

This conventional example is configured for left-hand traffic, and in the case of right-hand traffic, the left and right sides of FIGS. 9 to 11 are configured to be different. In either case, the light above the horizontal line H-H on the oncoming lane side (right side in Figure 11) is completely blocked, and the light on the own lane side (left side in Figure 11) is completely blocked.
Also, about 1/3 of the area above the horizontal line H-H is cut off.

[Problem that the invention attempts to solve]

When passing an oncoming vehicle, it is necessary to cut off the light distribution in the upward area of the oncoming lane as shown in Figure 11, but when there is no oncoming vehicle, it is better to drive if the road ahead can be brightly illuminated. Easy to do. This invention was created in response to such requests.
It is an object of the present invention to provide a projector type headlamp that can freely switch between a light distribution pattern for passing each other and a light distribution pattern for traveling alone.

[Means for solving problems]

In order to achieve the above object, the projector type headlight of the present invention has a light source bulb installed near the focal point of the reflector, and the light emitted from the light source bulb is reflected by the reflector to form a cut line near the shade. In a projector-type headlamp that focuses the light with a convex lens and projects the reflected light forward with a convex lens, the shade is supported so as to be slidable in the vertical direction so as to be moved toward and away from the optical axis. , attaching a cam follower part to the shade;
and means for supporting a part having an inclined surface slidingly in contact with the cam follower part so as to be slidable in a horizontal direction perpendicular to the optical axis, and driving the part having the inclined surface reciprocatingly in the horizontal direction. establish.

[Effect]

The projector-type headlight configured as described above is constructed by retracting the shade downward to separate it from the light flux so that it does not block (or only slightly blocks) the light flux reflected by the reflector. It is possible to brightly illuminate the area ahead in the driving direction far away, to achieve suitable illumination performance when there is no oncoming vehicle, and to restore the illumination performance to one that does not dazzle oncoming vehicles.

〔Example〕

FIG. 1 is a partial front view of the vicinity of the shade 14 in an embodiment of the projector type headlamp of the present invention, as viewed from the convex lens side in the optical axis direction, and FIG. 2 is a plan view of the vicinity of the shade 14.

The shade 14 has an elongated hole 14a in the vertical direction for supporting the shade 14 so as to be slidable in the vertical direction.
14b and 14c are provided. 2 is a light source bulb.

A bracket 1 having a vertical plate-like portion supports the shade 14 in a vertically slidable manner.
5 is provided, and the bracket 15 fits into the elongated holes 14a to 14c, and the brackets 16a to 16.
The shade 14 is supported through c.

A cam follower roller 17 is attached to the shade 14.
The drive plate 18, which has an inclined surface 18a that rotates in contact with the cam follower roller 17, is moved relative to the bracket 15 in the horizontal direction in the figure (that is, in the horizontal direction perpendicular to the optical axis of the headlamp). ) is slidably supported. 18a and 18b are long holes for support, 19
Similarly, a and 19b are rivets.

The drive plate 18 is biased to the right in the drawing by a spring 20, and is configured to be suctioned to the left in the drawing by a solenoid means 21.

22a and 22b are configured to bring the cam follower roller 17 into contact with the slope (i.e., cam surface) 18a.
This is a spring that urges the shade 14 downward.

In the headlight provided with the shade configured as described above, when the solenoid means 21 is not energized, the drive plate 18 is pulled to the right in the figure by the spring 20, and the slope (cam surface) 18a is The shade 14 is pushed up via a cam follower roller 17. The relative positions of the reflected light flux and the shade in this attitude are the same as in the conventional example shown in FIG. 10, and therefore illumination is performed with a light distribution pattern similar to that in FIG. 11.

When the solenoid means 21 is energized to draw the drive plate 18 to the left in the figure, the shade 14 is lowered as shown by the chain line 14' by the biasing force of the springs 22a and 22b. The relationship between the shade and the reflected light beam in this state is as shown in FIG. 3 when viewed from the reflecting mirror side in the optical axis direction, and the reflected light beam is hardly blocked. Therefore, when the screen provided in front of the headlamp is illuminated, a light distribution pattern as shown in FIG. 4 is obtained. This light distribution characteristic is suitable for use when there is no oncoming vehicle. Solenoid means 21
When the power is cut off and the shade is restored to the 14 position (Fig. 1) drawn in the actual battle, Figs. 10 and 11
It has light distribution characteristics similar to the conventional projector type headlight shown in the figure, and is suitable when passing an oncoming vehicle.

FIG. 5 shows a different embodiment from the above, and is a diagram opposite to FIG. 1 in the previous example.

The driving plate 18' in this example is a component corresponding to the slope 18a (FIG. 1) in the previous example.
A slot 18c inclined with respect to the horizontal line is provided and is fitted with a cam follower 17'. This example (FIG. 5) also provides the same effects as the previous example (FIG. 1), and can also omit the installation of the springs 22a and 22b.

[Effect of idea]

As described in detail above, when the present invention is applied, it is possible to freely switch between the light distribution pattern for passing each other and the light distribution pattern for independent travel.

[Brief explanation of drawings]

1 to 4 show one embodiment of the projector-type headlamp of the present invention, in which FIG. 1 is a front view of the shaded area, FIG. 2 is a front view, and FIG. 3 is an operational illustration. Figure 4 is a chart showing the light distribution pattern. FIG. 5 is a front view of a shaded portion in an embodiment different from the above. FIG. 6 is an explanatory diagram of a known projector type headlamp. Figures 7 to 9
The figure shows a conventional projector-type headlight.
The figure is a plan view, FIG. 8 is a side view, and FIG. 9 is a front view. FIGS. 10 and 11 are charts showing the optical characteristics of the above-mentioned conventional example. 1... Concave mirror, 2... Light source bulb, 2a... Filament, 3... Convex lens, 4... Shade,
4a...cut line, 14...shade, 14
a~14c...Long hole, 15...Bracket, 16
a to 16c... Rivet, 17... Cam follower roller, 18, 18'... Drive plate, 18a, 18
b...Long hole, 18c...Slot hole, 19a, 19b...
... Rivet, 20 ... Spring, 21 ... Solenoid means, 22a, 22b ... Spring.

Claims (1)

[Scope of utility model registration request] A projector in which a light source bulb is installed near the focal point of a reflecting mirror, the light emitted from the light source bulb is reflected by the reflecting mirror and focused near a shade having a cut line, and the reflected light is projected forward by a convex lens. In this type of headlamp, the shade is slidably supported in the vertical direction so as to be able to move toward and away from the optical axis, and a cam follower part is attached to the shade, and the cam follower part is attached to the shade. A projector characterized in that a part having an inclined surface for sliding contact is supported so as to be slidable in a horizontal direction orthogonal to the optical axis, and a means is provided for reciprocating the part having the inclined surface in the horizontal direction. type headlight.