JPS63304502A - 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 [Industrial Field of Application] The present invention relates to a projector type automobile headlamp.

[Prior Art] 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 Laid-Open No. 58-209801 is known.

FIG. 3 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 portion 101° 102 of every axial section is also the elliptical portion 101 of every axial section. The corresponding vertices 104 of .102 are configured to match.

110 is an outer focal point of the ellipse 102, 111 is a light-shielding plate-like dimmer, 112 is an outer focal point of the ellipse 101, and 113 is a lens.

FIG. 4 is a plan view schematically depicting an example of this type of projector type headlamp, FIG. 5 is a side view, and FIG. 6 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.

4 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 (
4 and 5).

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.

HH is a horizontal line on the screen, and ■-■ is also a vertical line.

As shown in FIGS. 4 to 6, a shade 4 having an edge along the meridional image plane is provided. In detail, as shown in 4a shown in FIG. 6, the horizontal cross section i-j of the meridional image plane
A cut line 4a is formed so as to recede downward from the point. FIG. 7 shows how the light distribution pattern described above and the shade 4 overlap. As shown in FIG. 7, 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. 7. form. FIG. 8 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. 6 to 8 are configured to be opposite.

FIG. 9 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 bulb 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 (Figure 9) is viewed from the front (left side of the figure), it is undesirable from a design standpoint that components of the projector unit 5 other than the convex lens appear through the front cover 7. Therefore, an inner panel 10 is provided to partition the interior space of the lamp housing 6 into front and rear parts. 1
0a is an aperture provided so as not to block the projected light flux.

The U-shaped rotating bracket 11 is connected to the lamp housing 6.
The projector unit 5 is rotatably supported on the pivot bracket 11 so as to be rotatable about a vertical shaft 12 .

Thereby, the direction of the optical axis 2 of the projector unit 5 can be adjusted.

[Problem to be Solved by the Invention Since the coprojector unit 5 has a built-in shade 4, the desired light projection pattern (the eighth
Figure) is obtained. Therefore, the conventional front cover 7 shown in FIG. 9 may be a so-called transparent cover. That is, it serves as a cover to prevent dust, rainwater, etc. from entering the lamp housing 6, and is made of a transparent member so as not to block the light beam emitted from the projector unit 5. Since the front cover 7 is transparent, the above-mentioned inner panel is required, which increases the number of component parts.

Moreover, in the conventional example (FIG. 5), when the optical axis direction of the projector unit 5 is adjusted, the inner panel opening 1
There was a risk that the concentricity between Oa and the convex lens 3 would change and the appearance would be impaired.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a projector-type automobile headlamp that has a small number of component parts and whose appearance does not change even if the optical axis direction of the projector unit is adjusted. .

[Means for Solving the Problems] The present invention, which was created to achieve the above object, is a method in which a light source bulb is installed near the focal point of a reflecting mirror, and the light emitted from the light source bulb is reflected by the reflecting mirror. The projector comprises a projector unit that projects the reflected light forward using a convex lens.

In a projector-type automobile headlamp in which a unit is installed in a lamp housing and a plate-shaped member is attached to cover a front opening of the lamp housing, a through hole is provided in the plate-shaped member, and the convex lens is fitted into the through hole and attached to a plate-shaped member.

However, in the present invention, a projector unit does not necessarily mean that they are mechanically connected, but refers to a set of multiple members (concave mirror, light source bulb, convex lens) that function in optical cooperation. , a shade is incorporated into this member as necessary.

[Function] According to the above configuration, since the structure penetrates the plate-like member (hereinafter referred to as the front panel) that covers the front opening of the lamp housing, the optical Does not interfere with function.

If the front panel is configured to be semi-transparent or opaque, or if minute irregularities are provided on the surface of the front panel,
Even without providing an inner panel, the internal structure of the projector unit 5 (excluding the convex lens) is not visible from the outside.

Furthermore, since the projector has a structure in which the convex lens is fixed through the front panel, the appearance does not change even if the optical axis is adjusted by rotating the components of the projector unit except for the convex lens.

[Embodiment] FIGS. 1 and 2 show an embodiment of a projector type headlamp according to the present invention, with FIG. 1 being a horizontal sectional view and FIG. 2 being a vertical sectional view.

This embodiment is an improvement of the conventional example (FIG. 9) by applying the present invention, and FIG. 2 is a diagram corresponding to FIG. 9 of the conventional example.

In this embodiment (Figs. 1 and 2), Fig. 9 (conventional example)
Components with the same drawing numbers as those in the conventional example are the same or similar to those in the conventional example.

A frame 9' shown with a reference number in FIG. 9 is a member corresponding to the frame 9 in the conventional example, but the frame 9' in this example does not support the convex lens 3.

The frame 9' fixedly supports the shade 4 relative to the concave mirror 1, and is rotatably supported by a vertical shaft 12 and a horizontal shaft 13.

A front panel 8 is made of an opaque member and is attached to cover the front opening of the lamp housing 6.

The front panel 8 is provided with an opening 8a that is slightly smaller than the outer periphery of the convex lens 3, and the convex lens 3 is fitted into the opening 8a.

The above-mentioned convex lens 3 is held by the presser 15 through the gasket 14.
is pressed against the edge of the opening 8a and fixed watertightly.

In the projector-type automobile headlamp of this embodiment configured as described above, since the front panel 8 is opaque, the internal structure of the projector unit 5 is not visible from the outside even if no inner panel is provided.

Further, even if the direction of the optical axis Z is adjusted by rotating the frame 9', the convex lens 3 does not move, so the appearance of the headlamp does not change.

[Effects of the Invention] As detailed above, the projector-type automobile headlamp according to the present invention has excellent practical effects in that the number of component parts is small and the appearance does not change even when the optical axis direction is adjusted. play.

[Brief explanation of the drawing]

FIG. 1 is a horizontal sectional view showing one embodiment of a projector-type automobile headlamp according to the present invention, and FIG. 2 is a vertical sectional view of the same. FIG. 3 is an explanatory diagram of a known example of a projector type headlamp. 4 to 6 show a conventional projector type headlamp, in which FIG. 4 is a plan view, FIG. 5 is a side view, and FIG. 6 is a front view. FIGS. 7 and 8 are charts showing the optical characteristics of the above-mentioned conventional example. FIG. 9 is a sectional view of a conventional example. 1... Concave mirror, 2... Light source bulb, 3... Convex lens, 4... Shade, 5... Projector unit,
6...Lamp housing, 7...Front cover, 8...
・Front panel, 8a... Opening, 9, 9'... Frame, 10... Inner panel, 11... Rotating bracket, 12... Vertical axis, 13... Horizontal axis, 14... Patsukin, 15... restraint. Patent applicant Nissan Motor Co., Ltd. Ichikoh Industries Co., Ltd. Agent Patent attorney Masami Akimoto (1 other person) Figure 2 Figure 3

Claims (1)

[Claims] 1. A light source bulb is installed near the focal point of the reflector, the light emitted from the light source bulb is reflected by the reflector, and a convex lens projects the reflected light forward to form a projector unit, and the projector unit is used as a lamp. In a projector-type automobile headlamp that is installed in a housing and has a plate-shaped member attached to cover the front opening of the lamp housing, a through hole is provided in the plate-shaped member,
A projector-type automobile headlamp, characterized in that the convex lens is fitted into the through hole and attached to a plate-like member.