JPH0739125Y2 - Projector type headlamp - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector type headlamp in which a projection lens is arranged in front of a spheroidal reflecting mirror.

[0002]

2. Description of the Related Art The structure of a conventional projector type headlamp is described in Japanese Patent Application Laid-Open No. 1-213901. In the one described in this publication, the projection lens and the light shielding plate (mask plate) are made movable to form a spot pattern and a pattern with no spread and no glare light.

[0003]

However, in the above-mentioned conventional technique, in order to form the patterns of the traveling beam and the passing beam as the headlamp, there is a problem in conformity with the light distribution standard in terms of the spread of the pattern.

Therefore, the present invention was devised in view of the above-mentioned problems of the prior art, and provides a projector type headlamp capable of obtaining a light distribution pattern conforming to the conformity with the light distribution standard. Has an aim.

[0005]

In order to achieve the above object, in the projector type headlamp of the present invention, a projection lens is arranged in front of a spheroidal reflecting mirror incorporating a light source at a first focal position. In the projector headlamp to be installed,

Between the ellipsoidal reflecting mirror and the projection lens, a rotatable shading plate whose lower end is attached to the rotary shaft of a rotary gear is arranged, and the front surface of the projection lens is a link axially attached to the rotary shaft. The projection lens is connected to the light-shielding plate via a link so as to be linearly movable in the optical axis direction. At the time of traveling beam, the second focus of the ellipsoidal reflecting mirror and the focus of the projection lens. Substantially coincident with each other, and at the same time, the light shielding plate is rotationally moved so as to be set in front of the second focal point and below the optical axis, or a second light shielding plate which is movable in conjunction with this light shielding plate is projected. It is set above the optical axis behind the focal point of the lens, and the diffusing lens is moved to the outside of the light emitting surface of the projection lens. At the time of passing beams, the light shielding plate is located behind the second focal point of the elliptical reflecting mirror. Also, rotate it to the approximate focus position of the projection lens. It is characterized by rotating the diffusing lens in front of the projection lens with.

[0007]

In the case of the low beam, the light shielding plate is moved to the rear of the second focal point F2 of the spheroid, and the diffusing lens is moved to the front surface of the projection lens to measure the left and right diffusion of the low beam pattern. At this time, the projection lens focal point F3 and the arrangement position of the light shielding plate are substantially coincident with each other.

During the traveling beam, the second focal point F2 of the ellipsoid of revolution and the focal point F3 of the projection lens are substantially coincident with each other, and at the same time, the light shielding plate is rotationally moved to be set below the optical axis in front of the point F2. As a result, the amount of light at the 4D-V point in the traveling beam screen pattern is suppressed and an ideal light distribution pattern is formed.

When a dedicated light-shield plate for traveling is used, the dedicated light-shield plate setting position is set above the optical axis behind point F2.

The diffusing lens set for the passing beam is diffused during the traveling beam when the traveling beam is used, if the diffusing lens is not necessary for improving the light collecting property during the traveling beam. The lens for use outside the light emitting surface of the projection lens.

[0011]

EXAMPLES Examples will be described with reference to the drawings. 1 to 4, the present invention relates to a projector-type headlamp in which a projection lens is arranged in front of a spheroidal reflecting mirror.

A light source 8 is incorporated at the position of the focal point F1 inside the elliptical reflecting mirror 1, and the lower end is attached to the rotary shaft 74 of the rotary gear 7 between the elliptical reflecting mirror 1 and the projection lens 2. A light-shielding plate 3 is arranged so as to be rotatable.

The rotary gear 7 is normally and reversely rotated by a worm gear 71 attached to a rotary shaft 73 of a motor 72.

A link 6 is provided on the front surface of the projection lens 2.
The diffusing lens 4 is rotatably arranged via the. The base of the link 6 is attached to the rotary shaft 74 of the rotary gear 7, and the diffusion lens 4 is attached to the tip of the link 6.

Further, the lower end of the projection lens 2 and a substantially intermediate position between the light shielding plate 3 are rotatably connected by a link 5, and the projection lens 2 is formed so as to be linearly movable in the optical axis R direction.

At the time of the passing beam, as shown in FIG. 1, the light shielding plate 3 is arranged behind the second focal point F2 of the spheroidal surface 1, and at the same time, the diffusion lens 4 is arranged in front of the projection lens 2. Then, measure the left and right divergence of the passing beam pattern. At this time, the focal point F3 of the projection lens 2 and the arrangement position of the light shielding plate 3 are substantially coincident with each other.

During the traveling beam, the second focal point F2 of the ellipsoid of revolution 1 and the focal point F3 of the projection lens 2 are substantially coincident with each other, and at the same time, the light shielding plate 3 is rotationally moved to be below the optical axis R in front of the focal point F2. By setting to the side, an ideal light distribution pattern in which the light amount at the 4D-V point in the traveling beam screen pattern is suppressed is formed.

Further, the same effect can be achieved by arranging a dedicated light shielding plate 31 for traveling which is movable in association with the light shielding plate 3.

In this case, the setting position of the exclusive shading plate 31 is set behind the point F2 and above the optical axis R.

The diffusing lens set at the time of the passing beam is designed to enhance the light collecting property at the time of the traveling beam.
When it is unnecessary, the diffusing lens 4 is moved to the outside of the light emitting surface of the projection lens 2 during the traveling beam along with the rotational movement of the light shielding plate 3.

FIG. 2 shows a light distribution pattern at the time of passing beams, where C represents a basic pattern of a headlamp,
B is a spread portion formed by the diffusion lens 4.

FIG. 4 shows a light distribution pattern for a traveling beam, and A is an edge line of the light shielding plate 3.

[0023]

Since the present invention is constructed as described above, it has the following effects. It is possible to realize a light distribution pattern that spreads to the left and right during a passing beam, and at the same time, since the diffusing lens is movable, it is possible to improve the light converging property during a traveling beam.

Further, if the light converging property is increased during the traveling beam, the illuminance at the 4D-V point exceeds the standard. However, during the traveling beam, it is also used during the traveling beam by moving the light shielding plate used for the passing beam. Therefore, a very simple structure can be used.

Further, since one light source can create a light distribution pattern suitable for a traveling beam and a passing beam, space saving and cost reduction can be achieved.

Further, even in the case of a special light source which requires a lighting device such as a discharge lamp, the number of lighting devices can be reduced to half, so that significant space saving and cost reduction can be realized.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention when a passing beam is used.

FIG. 2 is a diagram showing a light distribution pattern at the time of passing beams of the present invention.

FIG. 3 is a schematic view of an embodiment of the present invention when a traveling beam is used.

FIG. 4 is a diagram showing a light distribution pattern of a traveling beam of the present invention.

[Explanation of sign]

 1 Ellipsoidal reflector 2 Projection lens 3 Light-shielding plate 4 Diffusing lens 5 Link 6 Link 7 Rotating gear

Claims (1)

[Scope of utility model registration request] 1. A projector-type headlamp in which a projection lens is provided on the front surface of a spheroidal reflecting mirror incorporating a light source at a first focal position, wherein a lower end is provided between the elliptical reflecting mirror and the projection lens. A rotatable light shield attached to the rotary shaft of the rotary gear is arranged, and a diffusion lens attached to a link axially attached to the rotary shaft is arranged in front of the projection lens. Via a linear movement in the optical axis direction, the second focus of the elliptical reflecting mirror and the focus of the projection lens are substantially coincident with each other at the time of traveling beam, and at the same time, the light shielding plate is rotationally moved to the second focus. It is set further forward and below the optical axis, or a second light blocking plate movable in conjunction with this light blocking plate is set above the optical axis behind the focal point of the projection lens and the diffusion lens Move out of the emitting surface of the projection lens However, at the time of passing beams, the light shielding plate is rotated to the rear of the second focal point of the elliptical reflecting mirror and to the approximate focus position of the projection lens, and the diffusion lens is rotated to the front surface of the projection lens. This is a projector headlamp.