JPS63304501A - Projector type automobile head light - 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 automobile 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. The latest technology regarding this projector as a headlamp is known, for example, in Japanese Patent Laid-Open No. 58-209801.

FIG. 2 shows the above-mentioned known projector type headlamp. The headlamp 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 In a vehicle headlamp increasing from a direction vertical longitudinal section to an axial horizontal longitudinal section, the focal point 105 of the elliptical portion 101° 102 of every axial section is also within the ellipse of every axial section. Corresponding vertices 104 of portions 101 and 102
are configured to match.

110 is an outer focal point of the ellipse 102, 11o is a light-shielding plate-like dimmer, 112 is an outer focal point of the ellipse 101, and 113 is a lens.

FIG. 3 is a plan view schematically depicting an example of this type of projector type headlamp, FIG. 4 is a side view, and FIG. 5 is a front view.

l is a concave mirror and F is its focal point. The light source pulp 2 is provided so that the filament is located near the focal point F'.

A convex lens is provided to share the optical axis 2 with the concave mirror 1 described above.

j-j in FIG. 3 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 enters this meridional image plane.

The above incident light is modulated by the convex lens 3 and is directed forward (
3 and 4).

If a screen is provided near the meridional image plane and the light distribution pattern is shown as an isoluminance curve, the result will be as shown in FIG.

H-H is a horizontal line on the screen, and V-V is also a vertical line.

As shown in FIGS. 3 to 5, a shade 4 having an edge along the meridional image plane is provided. Specifically, as shown in 4a shown in FIG. 5, the horizontal section 1-j of the meridional image plane
A cut line 4a is formed so as to recede downward from the point. FIG. 6 shows how the light distribution pattern described above and the shade 4 overlap. As shown in FIG. 6, the upper part of the light beam passes through. The main part of the lower calf is blocked, but light is allowed to pass through the part corresponding to cut line 4&.

As the partially covered light beams as described above are focused on the meridional image plane 1-j 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. 6. form. FIG. 7 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. 5 to 7 are configured to be opposite.

FIG. 8 is a vertical cross-sectional view of an automobile headlamp equipped with a projector unit configured by applying the above-mentioned projector-type lamp.

A projector unit 5 includes a concave mirror 1, a light source pulp 2, a convex lens 3, and a shade 4, and is housed in a lamp housing 6. 7 is a front cover.

A frame 9 supports the convex lens 3 on the concave mirror 1 and also supports the shade 4, thereby forming the projector unit 5.

When this headlight (Fig. 8) is viewed from the front (left side of the figure), it is not desirable from a design standpoint that components other than the convex lens of the projector unit 5 are visible through the front lens 7. An inner panel 10 is provided to partition the interior space of the lamp housing 6 into front and rear parts. 10
The aperture is an aperture provided so as not to block the projected light flux.

A rotating bracket 11 is rotatably mounted on a vertical shaft 12 with respect to the lamp housing 6, and a projector unit 5 is rotatably supported on a horizontal shaft 13 with respect to the rotating bracket 11. has been done. This allows the direction of the optical axis 2 of the projector unit 5 to be adjusted.

When adjusting the optical axis direction, the projector unit 5 is tilted in the horizontal direction 13 and the vertical direction 12, so a gap g is provided between the projector unit 5 and the inner panel opening 10m.

[Problem that the invention seeks to solve]

Light that is emitted from the light source pulp 2 and enters the convex lens 3, for example, is emitted as shown by arrow a, is reflected as shown by arrow S, and is reflected as shown by arrow C.
Most of the refracted light is projected forward as shown by the arrow, but some of it is reflected as shown by the arrow d, and some of it is reflected as shown by the arrow e,
After being repeatedly reflected and scattered as indicated by f, it is emitted as diffused light as indicated by arrow l.

The above arrows a to 1 are just one example, and scattering occurs within the convex lens 3 for other optical paths as well.

Therefore, even when the headlamp is viewed diagonally from the front, the convex lens 3 can be seen like a light-emitting body.

Further, even when the light source pulp 2 is not lit, when strong incident light (for example, sunlight m) is received from diagonally ahead, the convex lens 3 exhibits an appearance as if it is emitting a beam of light due to scattering within the convex lens 3, There is a risk of causing an illusion or misunderstanding of other vehicles.

The present invention has been made in view of the above-mentioned circumstances, and is a projector-type headlight that does not cause any illusion or misunderstanding due to scattered light within the convex lens when the headlight is viewed diagonally from the front. The purpose is to provide

[Means for solving problems]

In order to achieve the above object, the projector type headlamp of the present invention includes a conical cylindrical member that expands toward the front, and a cylindrical member in front of a convex lens constituting the projector type headlamp. At least one of these is provided to limit the diffusion range of the scattered light that is reflected and scattered within the convex lens and exits diagonally forward.

[For production]

According to the above configuration, among the light scattered within the convex lens and emitted obliquely forward, the component having a large diffusion angle with respect to the optical axis is absorbed by the cylindrical member (cylindrical member or conical tube). (shaped member).

Furthermore, the blocked light is reflected by the cylindrical member,
By arbitrarily setting the reflectance of the inner surface of the cylindrical member, reflected light can also be controlled.

〔Example〕

FIG. 1 is a sectional view showing one embodiment of the present invention.

This embodiment is an improvement by applying the present invention to the conventional example shown in FIG. , are the same or similar components to those in the conventional example.

14 is the inner panel of this embodiment, and the outer peripheral portion 14
A conical cylindrical portion 14b is integrally arranged inside the cylindrical portion 14b to form an annular structure having an asymmetric V-shaped cross section. Above outer peripheral part 1
4 m is a component for preventing the internal configuration of the projector unit 5 (portions other than the convex lens 3) from appearing on the outside.

The conical cylindrical portion 14b in this example has a shape that expands toward the front, but it may also have a cylindrical shape.

In this example, light is emitted from the light source pulp 2 as shown by the arrow 1.
Since the light scattered within the convex lens 3 and emitted as shown by the arrow l hits the conical cylindrical portion 14b of the inner panel 14, it is reflected as shown by the arrow without traveling as shown by the arrow j.

By appropriately adjusting the reflectance by coating the inner surface of the conical cylindrical portion 14b, the intensity of light in the direction indicated by the arrow can be controlled.

The above has described the light emitted from the light source pulp 2 and scattered within the convex lens 3, but the same effect also applies to the light that is directly incident on the convex lens 3 and is scattered within the convex lens 3.
Effects can be obtained.

〔Effect of the invention〕

As detailed above, when the present invention is applied, it is possible to control the light scattered within the convex lens from being emitted diagonally forward, thereby preventing a person viewing the light diagonally from the front from having an illusion or misperception caused by the scattered light. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a projector type automobile headlamp according to the present invention. FIG. 2 is an explanatory diagram of a known projector type headlamp. 3 to 5 show a conventional projector type headlamp, in which FIG. 3 is a plan view, FIG. 4 is a side view, and FIG. 5 is a front view. FIGS. 6 and 7 are charts showing the optical characteristics of the above-mentioned conventional example. FIG. 8 is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Concave mirror, 2... Light source pulp, 3... Convex lens, 4... Shade, 5... Projector unit, 6... Lamp housing, 7... Front cover, 1
4... Inner panel, 14a... Inner panel outer periphery i, 14b... Inner panel conical cylindrical part. Patent applicant Nissan Motor Co., Ltd. Ichikoh Industries Co., Ltd. Agent Patent attorney Tadashi Akimoto 1 other person Figure 1 5

Claims (1)

[Claims] 1. In a projector-type automobile headlamp in which a light source pulp is installed near the focal point of a reflector, the light emitted from the light source pulp is reflected by the reflector, and the reflected light is projected forward by a convex lens. , in front of the convex lens, at least one of a conical cylindrical member that expands toward the front and a cylindrical member is provided, and a diffusion range of scattered light reflected and scattered within the convex lens and emitted obliquely forward. A projector-type automobile headlamp characterized by restricting.