JPS62202402A - Projector type head lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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 provide a porthole to 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 Laid-Open No. 58-209801 is known.

FIG. 7 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 towards the axially horizontal longitudinal section, the focal point 105 of the elliptical portions 101, 102 of all axial sections is also the elliptical portion 101 of all axial sections. The corresponding vertices 104 of .102 are configured to match.

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

FIG. 8 is a plan view schematically depicting an example of this type of projector type headlamp, FIG. 9 is a side view, and FIG. 10 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.

8 indicates the meridional image plane of the convex lens 3, and the light emitted from the light source and reflected by the concave mirror 1 is incident on this meridional image plane.

The above incident light is modulated by the convex lens 3 and is directed forward (
8 and 9).

When a screen is provided near the meridional image plane and the light distribution pattern is shown as an isoluminance curve, it becomes as shown in FIG. 11. H-H is a horizontal line on the screen, and V-V is also a vertical line.

As shown in FIGS. 8 to 10, a shade 4 having an edge along the meridional image plane is provided. For details, see Part 10.
As shown in the figure, a cut line 4a is formed so as to recede from the meridional image plane ij. FIG. 11 also shows how the light distribution pattern described above and the shade 4 overlap. As shown in FIG. 11, 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 Fig. 11. form. FIG. 12 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. 10 to 12 are configured to be opposite. In either case, the light distribution pattern is constant and cannot be changed while the car is running.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a projector type headlamp whose light distribution pattern can be arbitrarily switched. This makes it possible to switch between the light distribution pattern for general driving and the light distribution pattern for passing each other, and it also becomes possible to switch between the light distribution pattern for right-hand traffic and the light distribution pattern for left-hand traffic.

[Means for solving problems]

In order to achieve the above object, the projector type headlamp of the present invention includes a light source bulb installed near the focal point of a reflector, and the light emitted from the light source bulb is reflected by the reflector to form a shade with a cut line. In a projector-type headlight that focuses nearby and projects the reflected light forward using a convex lens, a pivot shaft perpendicular to the optical axis is provided below the optical axis, and the shade is attached to the pivot shaft. The present invention is characterized in that it is supported by the shade and is provided with drive/control means for rotating the shade.

[Effect]

The projector-type headlamp configured as described above rotates the rotation axis and rotates the shade around it, so that the light beam reflected by the reflector can be dimmed by the cut line of the shade. The shade can be placed in a position parallel to the optical axis and evacuated from the reflected light flux, so that the light flux is not blocked. Furthermore, it is also possible to change the dimming state by attaching two shades each having a cut line of a different shape to one rotating shaft and rotating these.

FIGS. 13 to 16 are explanatory diagrams depicting the principle of the operation of the present invention. (A) in each figure shows a schematic perspective view of a shade, and (B) in each figure shows a light distribution pattern.

FIG. 13(A) shows the shade 14 fixed to the rotating shaft 13.
into a vertical position, and align its cut line 14a with the optical axis Z.
It is in a state where it is brought close to. This state is similar to that shown in FIG. 11 in the conventional projector type headlamp. Therefore, the light distribution pattern in the state shown in FIG. 13 (8), as shown in FIG. 13 (B), is similar to the light distribution pattern in FIG. 12 in the conventional example.

When the rotation shaft 13 is rotated 90 degrees from the above state, the first
As shown in Figure 4 (8), the shade 14 is positioned horizontally (optical axis Z
) and are spaced below the optical axis Z so that the light flux (the light flux reflected by the reflecting mirror) is not blocked. Therefore, the light distribution pattern in this state illuminates the front of the road surface vertically and horizontally symmetrically, as shown in FIG. 14(B).

This light distribution pattern is suitable for driving when there is no oncoming vehicle.

A shade 14 provided with a cut line 14a similar to that described above and a shade 15 provided with a cut line 15a different from that described above are fixed to the rotating shaft 13 shown in FIG. 15(A), facing each other. . When the shade 14 is placed in a vertical position with the shade 14 facing upward as shown in FIG. 15(A), the reflected light beam is dimmed by the cut line 14a as in FIG. 13(A), and as shown in FIG. 13(B). A light distribution pattern 15 (B) similar to the above is obtained. From this state, rotate the rotation axis 13 by 1
When rotated by 80 degrees, it becomes as shown in Fig. 16 (8), and the reflected light beam is modulated at the cut line 15a, as shown in Fig. 16 (B).
The light distribution pattern shown in is obtained.

Although not shown in the drawings, by fixing two shades having cut lines with opposite left and right shapes to the rotating shaft, the light distribution pattern for right-hand traffic and left-hand traffic can be switched and used.

〔Example〕

Figures 1 to 6 show one of the projector type headlights of the present invention.
An example is shown.

This embodiment is an example of improving the conventional projector type headlamp shown in FIGS. 8 to 10 by applying the present invention, and is given the same drawing reference number as the conventional example. is a component that is the same as or similar to that in the conventional example.

FIGS. 1 to 3 depict the state corresponding to FIG. 15(A) of the above-mentioned explanatory diagram.

That is, two shades 14 and 15 are attached to the rotation shaft 13.

16 and 17 are bearing brackets for the rotating shaft 13, and 18 is a drive motor (in this example, a step motor).

In this state, shade 1 is shown in Figure 3.
The light is dimmed by 4. From this state, drive motor 1
8 and rotates the rotating shaft 13 by 180 degrees, the shade 15 becomes dimmable.

Also, from this state (Figs. 1 to 3), rotate the rotation shaft 13 to 9
When turned 06 times, it becomes as shown in Figures 4 to 6,
None of the shades 14 and 15 block the luminous flux. In this state, a light distribution pattern similar to or similar to the light distribution pattern previously shown in FIG. 14(B) is obtained, and is suitable for solo travel (in a state where there is no oncoming vehicle).

〔Effect of the invention〕

As described in detail above, according to the projector type headlamp of the present invention, the light distribution pattern can be arbitrarily switched while the automobile is running.

[Brief explanation of drawings]

Figures 1 to 6 show one of the projector type headlights of the present invention.
Embodiments are shown in which Fig. 1 is a plan view of a state in which the reflected light flux is modulated by a shade, Fig. 2 is a side view of the same, Fig. 3 is a front view of the same, and Fig. 4 is a state in which the reflected light flux is blocked by a shade. 5 is a side view of the same, and FIG. 6 is a front view of the same. FIG. 7 is an explanatory diagram of a known projector type headlamp. 8 to 10 show a conventional projector type headlamp, in which FIG. 8 is a plan view, FIG. 9 is a side view, and FIG. 10 is a front view. FIGS. 11 and 12 are charts showing the optical characteristics of the above conventional example. FIGS. 13 to 16 are explanatory views of the operation of the projector type headlamp of the present invention. 1... Concave mirror, 2... Light source bulb, 2a... Filament, 3... Convex lens, 4... Shade, 4a
...Cut line, 1.3...Rotation axis, 14.15
...shade, 14a. 15a... Cut line, 16.17... Bearing bracket, 18... Drive motor. Patent Applicant Ichikoh Industries Co., Ltd. Agent Patent Attorney Masami Akimoto No. 1 Figure 3 Figure 5rX! Figure 6 Figure 7 Figure 9 Section Y Figure 1O Figure 11 Figure 16 (A knob 4a

Claims (1)

[Claims] 1. A light source bulb is installed near the focal point of the reflector, and the light emitted from the light source bulb is reflected by the reflector and focused near the shade having a cut line, and the reflected light is projected forward by a convex lens. In a projector-type headlamp, a pivot shaft is provided below the optical axis and perpendicular to the optical axis, and the shade is supported by the pivot shaft, and drive and control for rotating the shade is provided. A projector-type headlamp characterized by being provided with a means.