JPH06275103A - Lamp structure - Google Patents

Abstract

PURPOSE:To provide a lamp structure which can be miniaturized without increase in its manufacturing cost. CONSTITUTION:A luminous bulb 26 is mounted on the deep side face of the housing 22 of a headlamp 20. A reflector 28, which has a reflecting surface made by a rough paraboloid of revolution formed by rotation of a rough parabola about its axis, is mounted on the end portion of the luminous bulb 26 with the axis of the parabola tilted relative to the direction F of illumination of the head lamp 20, and the reflector 28 is brought close to a lens 24. The luminous portion of the luminous bulb 26 is disposed roughly at the focus of the parabola. The lens 24 is formed to fit with the shape of the front of an automobile, and is tilted relative to the housing 22. Inclination-compensating cuts 24a are formed on the inside face of the lens 24 and a fisheye lens 24b is formed on the surface of the inclination-compensating cuts 24. Light reflected by the reflector 28 is transmitted through the fisheye lens 24b and diffused, and then transmitted through the inclination-compensating cuts 24a with its optical path refracted and pointed in the direction F of illumination of the head lamp 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp structure in which light emitted from a light emitting bulb is reflected by a reflector to illuminate the front, and more particularly to a lamp structure suitable for a headlamp of a vehicle.

[0002]

2. Description of the Related Art At the front of an automobile or the like, there is mounted a headlamp for illuminating the front side in the traveling direction when traveling at night. As shown in FIG. 2, the headlamp 1 is configured by mounting a lens 4 on a front portion of a housing 2 having a substantially rectangular parallelepiped shape, and inside the housing 2, a parabolic rotation surface is formed and an inner surface is formed. A reflector 6 having a reflecting surface and a light emitting bulb 8 arranged at a position substantially at the focus of the parabola of the reflector 6 are housed. In addition,
The rotation axis of the parabolic rotation surface of the reflector 6 is oriented in the irradiation direction F of the headlamp 1 described later.

When the light emitting valve 8 emits light, most of the emitted light is reflected by the reflector 6 and then enters the lens 4. At this time, the reflector 6
Is substantially a parabolic surface of revolution, and since the light emitting bulb 8 is arranged at the focal point of the parabola, the optical path of the reflected light reflected by the reflector 6 is the axis of rotation of the parabolic surface of revolution. The direction is almost parallel to.

A large number of minute fisheye lenses 4a are formed on the incident surface of the lens 4, and the incident light is diffused by the fisheye lens 4a. This scattered light is emitted in the irradiation direction F of the headlamp 1 and is irradiated in the traveling direction of an automobile (not shown).

The fish-eye lens 4a does not refract the optical path of the transmitted light, but the optical path of the reflected light from the reflector 6 is substantially in the irradiation direction F, so that the reflected light is refracted in its optical path. Without passing through the lens 4, the transmitted light is emitted in the irradiation direction F of the headlamp 1.

[0006]

However, in the above-described lamp structure, the lens 4 has an appropriate inclination according to the outer shape of the automobile, and the reflector 6 does not depend on the inclination of the lens 4 in the irradiation direction. It must be oriented towards F. For this reason, a gap is created between the reflector 6 and the lens 4, which hinders downsizing of the housing 2. As a result, there are restrictions on the design of the vehicle body, and it becomes difficult to reduce the weight of the vehicle body.

By the way, as a structure for reducing the size of the housing 2, as shown in FIG. 3, there is a structure in which the inner lens 10 is provided immediately before the light emitting bulb 8 and the reflector is not provided. The lens surface of the inner lens 10 is provided with a Fresnel cut 10a, and the light path of the light emitted by the light emitting bulb 8 is directed in the irradiation direction F by passing through the Fresnel cut 10a. The transmitted light is incident on the outer lens 14 attached to the front part of the housing 12, diffused by the fisheye lens 14a formed on the lens surface of the outer lens 14, and emitted in the irradiation direction F of the headlamp.

However, in the headlamp having the structure shown in FIG. 3, although the depth of the housing 12 is shortened, the inner lens 10 must be provided inside the housing 12, and the inner lens 10 is provided with the reflector 8. The more complex structure may increase manufacturing costs.

Therefore, an object of the present invention is to provide a lamp structure which can be downsized without increasing the manufacturing cost.

[0010]

In order to achieve the above-mentioned object, the lamp structure according to the present invention has a light emitting bulb capable of emitting an appropriate amount of light and a light emitted from the light emitting bulb reflected in substantially the same direction. A reflector structure, a lens for transmitting the reflected light reflected by the reflector, and a light diffusing means for diffusing the reflected light, wherein the diffused reflected light is emitted from the lens in the irradiation direction. The reflector is inclined so that the optical path of the reflected light reflected by the lens is appropriately inclined with respect to the irradiation direction of the lens, and optical path refraction means for refracting the optical path is provided in the optical path of the reflected light. The diffused means diffuses the reflected light reflected, and the optical path refracting means refracts the optical path of the reflected light in the irradiation direction of the lens, and the diffused reflected light is It is characterized by injecting the irradiation direction from.

[0011]

The light emitting valve emits light, and the emitted light is reflected by the reflecting surface of the reflector. The optical path of the reflected light due to this reflection is a direction that is appropriately inclined with respect to the irradiation direction of the lamp.

Then, the reflected light is diffused by the light diffusing means, and the reflected light is refracted by the optical path refracting means in the direction substantially coincident with the irradiation direction of the lamp. The diffused reflected light is emitted from the lens in the irradiation direction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The lamp structure according to the present invention will be specifically described below based on the illustrated embodiments. In this embodiment, the lamp structure used for the headlamp of the automobile is described.

As shown in FIG. 1, the headlamp 20 comprises a housing 22 having a substantially rectangular parallelepiped shape and a lens 24 fixed to the front portion of the housing 22. The traveling direction of the automobile is the irradiation direction F of the headlamp 20.

A light emitting bulb 26 is attached to a substantially central portion of the back side of the housing 22, and a reflector 28 is attached to a proximal end portion of the light emitting bulb 26. The reflector 28 is formed on a substantially parabolic rotation surface obtained by rotating a parabola about its central axis, and its inner surface is a reflecting surface. The light emitting portion of the light emitting bulb 26 is disposed at the position of substantially the focus of the parabola. Further, the reflector 28 is arranged so that the central axis of the parabola is appropriately inclined with respect to the irradiation direction F of the headlamp 20, and is close to the lens 24 described later.

The lens 24 fixed to the front portion of the housing 22 is formed in conformity with the shape of the front portion of an automobile (not shown), and is appropriately inclined and curved with respect to the housing 22. There is. An inclination correction cut 24a is provided as an optical path refracting means on the inner surface of the lens 24, and the reflected light reflected by the reflector 28 is the inclination correction cut.
The light path is refracted by passing through 24a, and the light path is directed in the irradiation direction F of the headlamp 20. On the surface of the tilt correction cut 24a, a large number of minute fisheye lenses 24b are formed as a light diffusing means.
The reflected light reflected by 28 is transmitted through these fisheye lenses 24b and diffused.

The operation of the lamp structure according to this embodiment constructed as above will be described.

When the light emitting bulb 26 emits light, most of the emitted light is reflected by the reflector 28.
At this time, the reflecting surface of the reflector 28 is substantially a paraboloidal rotating surface, and since the light emitting bulb 26 is disposed substantially at the focal point of the parabola, the optical paths of the reflected light are all the central axes of the parabola. Is directed in a direction substantially parallel to. Then, this reflected light is made incident on the fisheye lens 24b of the lens 24 and is appropriately diffused. The diffused diffused light is incident on the inclination correction cut 24a of the lens 24, and its optical path is refracted by passing through the inclination correction cut 24a,
The optical path is directed in the irradiation direction F. Therefore, the light emitted from the lens 24 illuminates the traveling direction of the automobile in which the lamp 20 is mounted.

As described above, according to this embodiment,
A tilt correction cut 24 as an optical path refraction means for the lens 24.
Since the a and the fisheye lens 24b as the light diffusing means are formed, the lamp structure can be made smaller and lighter than the structure in which the optical path refracting means and the light diffusing means are provided in other portions.

Further, since the inclination correction cut 24a and the fisheye lens 24b are formed on the inner surface of the lens 24, mud, wax, etc. do not accumulate between the irregularities of these lens surfaces,
The illumination ability of the headlamp 20 can be fully exerted. That is, when the inclination correction cut 24a and the fish-eye lens 24b are formed on the outer side surface of the lens 24, mud, wax, etc. enter into the inner part of the unevenness of the lens surface and cannot be easily dropped, and the illumination ability of the headlamp 20 is reduced. However, since the unevenness is formed on the inner surface of the lens 24, the above situation does not occur.

Further, a tilt correction cut 24a and a fish-eye lens 24b are formed on the inner surface of the lens 24 to have a complicated shape. However, if the lens 24 is made of plastic, molding can be performed easily. The manufacturing cost does not increase.

In the present embodiment, the reflected light reflected by the reflector 28 is transmitted through the fish-eye lens 24b of the lens 24 and then through the inclination correction cut 24a of the lens 24, but in the reverse order. I don't mind. That is, the structure may be such that the reflected light is transmitted through the inclination correction cut and then through the fisheye lens. In this case, it is preferable that the inclination correction cut is formed on the inner surface of the lens and the fisheye lens is formed on the outer surface of the lens.

Further, although the light diffusing means is formed on the lens surface in the present embodiment, the reflected light itself may be diffused by the reflector 28 having a slightly expanded shape. In this case, since it is not necessary to form the light diffusing means on the lens surface, the lens can be easily molded.

[0024]

As described above, according to the lamp structure of the present invention, the reflector is inclined so that the optical path of the reflected light reflected by the reflector is appropriately inclined with respect to the irradiation direction of the lens. Therefore, when the lens is attached to be inclined with respect to the irradiation direction, the reflector can be arranged along the inclination. Therefore, the reflector is arranged close to the lens, and the depth of the lamp is shortened. As a result, the housing of the lamp is reduced, the material cost is reduced, and the degree of freedom in designing a device in which the lamp is mounted is increased. And since the weight of the lamp is reduced,
The weight of the mounted device can be reduced.

Further, since the optical path refracting means is provided in the optical path of the reflected light reflected by the reflector, the reflected light is emitted from the lens in the irradiation direction even if the optical path is inclined. Therefore, it is possible to emit light in a predetermined direction from a device or the like equipped with this lamp.

[Brief description of drawings]

FIG. 1 is a partially omitted horizontal sectional view showing a state in which a lamp structure according to the present invention is cut along a horizontal plane.

FIG. 2 is a horizontal sectional view, partly omitted, showing a state where a conventional lamp structure is cut.

FIG. 3 is a partially omitted horizontal sectional view showing a state in which another example of the conventional lamp structure is cut.

[Explanation of symbols]

 20 Headlamp 24 Lens 24a Tilt correction cut (optical path refraction means) 24b Fisheye lens (diffusing means) 26 Light emitting bulb 28 Reflector

Claims (1)

[Claims] 1. A light emitting bulb capable of emitting light with an appropriate amount of light,
The reflector includes a reflector that reflects light emitted from the light emitting valve in substantially the same direction, a lens that transmits the reflected light reflected by the reflector, and a diffuser that diffuses the reflected light. In a lamp structure that emits in the irradiation direction from a lens, the reflector is tilted so that the optical path of the reflected light reflected by the reflector is appropriately inclined with respect to the irradiation direction of the lens, and in the optical path of the reflected light, An optical path refracting means for refracting the optical path is provided, the diffused means diffuses the reflected light reflected by the reflector, and the optical path refracting means refracts and diffuses the optical path of the reflected light in the irradiation direction of the lens. A lamp structure in which reflected light is emitted from the lens in the irradiation direction.