JP2001184911A - Vehicle lighting - Google Patents

Abstract

(57) [Summary] (Modifications required) [Problem] In a projection-type lamp, the light emitted from the light source and reflected by the lower half of the reflector is blocked by the shade, so that light is not used effectively. Was. A reflector using a part of an elliptical shape, a light source provided at a first focal point thereof, an aspherical lens provided before the light source, and a light distribution as a lamp provided near a second focal point of the reflector. In a projection-type vehicle lamp configured with a shade 5 for obtaining characteristics,
On the light source side of the shade, there is provided a vehicular lamp which has been subjected to reflection processing 6 so as to reflect light reflected from the lower half of the reflector to the upper half of the reflector. Further, the shade portion for performing the reflection process has a convex shape on the light source side, and the shade portion for performing the reflection process has a spherical shape on the light source side around the second focal point of the reflector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vehicular lamp.
In particular, a projection-type vehicle lighting device is characterized in that a portion of the light emitted from the light source in the conventional lighting device is invalidated by effectively devising the shape of the shade.

[0002]

2. Description of the Related Art A conventional projection type lamp 9
0 is shown in the vertical sectional view in FIG. Reference numeral 91 denotes a light source, usually a halogen bulb. Reference numeral 92 denotes a reflector provided at the rear of the light source, which is usually formed of a part of an elliptical shape. The light source is provided at a first focal point F91 of the reflector. Reference numeral 93 denotes a lens provided in front of the light source, which looks hemispherical in the figure, but has a constant diameter and is called an aspheric lens. The focal point of this lens and the second focal point F92 of the reflector are provided so as to substantially coincide with each other. Reference numeral 94 denotes a shade for determining the light distribution, which is provided slightly closer to the light source than the second focal point.

[0003] Of the light emitted from the light source, the light that hits the reflector is reflected by the reflector because the light source is provided at the first focal point of the reflector, and travels toward the second focal point of the reflector. At this time, the light that has hit the upper half of the reflector passes through the second focal point after reflection, passes through the lower side of the lens, and exits in front of the lamp.

The light hitting the lower half of the reflector is reflected so as to aim at the second focal point, but is blocked by a shade existing in front and does not reach the lens. The shape of the shade does not completely block light from the lower half of the reflector, but has a shape that is partially cut obliquely so as to allow a part of the light to pass through. Therefore, the light distribution by the light emitted through the lens is as shown in FIG.

This light distribution diagram is for domestic use (for a vehicle having a steering wheel on the right side). In a vehicle having a steering wheel on the left side, as in most countries in Europe and the United States, the light distribution portion above the horizontal line is on the right side. To be present.

[0006] All of the above are described in the low state (passing state) of the headlamp. In the high state (running state), since the shade is removed, the light reflected on the lower half of the reflector passes through the second focal point and exits from the upper half of the lens. That is, the light is combined with the reflected light from the upper half of the reflector. Light is emitted from the entire surface.

A lamp other than the projection type has a plurality of filaments in a light bulb, and switches between high and low by turning on one of the filaments using a switch provided outside to switch a predetermined light distribution. However, in a projection type lamp, physically moving the shade is usually used only for low due to various problems such as rattling of the movable part and providing a device to actually move the shade. Many.

In such a case, a projection lamp only for low and a conventional lamp for exclusive use for high or for switching between high and low are used in combination.

[0009]

However, in the above-mentioned projection type lamp, since the light reflected by the lower half of the reflector is blocked by the shade, this light has not been used effectively. That is, for example, nearly half of the light from a bulb having an output of 55 W is invalid.

[0010] A lamp having a conventional structure has a plurality of filaments in a single bulb, and high / low switching is performed by switching energization to the filament, and the positional relationship between the filament and the reflector (or). (Including the lens) to obtain the required light distribution. Therefore, there is basically no light that becomes invalid. However, a projection-type lamp has a structure in which half of reflected light must be cut using a shade in order to obtain a light distribution in a low state.

That is, if the light that is invalidated in this part can be used effectively, the W
The number can be reduced, which contributes to reduction of power consumption, that is, effective use of resources.

[0012]

A reflector using a part of an elliptical shape, a light source provided at a first focal point thereof, an aspheric lens provided in front of the light source, and a lamp provided near a second focal point of the reflector. And a shade for obtaining light distribution characteristics of the so-called projection type vehicle lighting device, wherein the light source side of the shade reflects light reflected from the lower half of the reflector to the upper half of the reflector. The object of the present invention is to solve the above-mentioned problem by providing a vehicular lamp characterized by being subjected to reflection processing as described above.

The above problem is solved by providing a shade for a vehicle lamp, wherein the shade portion for performing the reflection processing has a convex shape on the light source side.

The above-mentioned problem is solved by providing a shade for a vehicle lamp, wherein the shade portion for performing the reflection processing has a spherical shape on the light source side around the second focal point of the reflector. Things.

[0015]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention. In FIG. 1, 1 is a lamp, 2 is a light source, and usually a halogen bulb is used. Reference numeral 3 denotes a reflector provided at the rear of the light source, which is usually constituted by a part of an elliptical shape. The light source is the first of this reflector
It is provided at the focal point F1. Reference numeral 4 denotes a lens provided in front of the light source, which looks like a hemisphere when viewed in the figure, but has an irregular diameter and is called an aspheric lens. The focal point of this lens and the second focal point F2 of the reflector are provided so as to substantially coincide with each other. Reference numeral 5 denotes a shade for determining the light distribution, which is provided slightly closer to the light source than the second focal point.

[0016] Of the light emitted from the light source, the light that strikes the reflector is reflected by the reflector because the light source is provided at the first focal point of the reflector, and travels toward the second focal point of the reflector. At this time, the light that has hit the upper half of the reflector passes through the second focal point after reflection, passes through the lower side of the lens, and exits in front of the lamp.

Up to this point, the configuration is the same as that of the conventional projection type lamp except for the shape of the shade. In the first embodiment of the present invention, the upper portion of the shade (FIG. 2) is subjected to reflection processing 6 so that light reflected by the lower half of the reflector is reflected by the upper half of the reflector. It is characterized by being. The reflection treatment may be Al deposition conventionally performed on the reflector, or a reflective paint may be applied.

Since the shade is subjected to a reflection process so that light reflected on the lower half of the reflector and hitting the shade is reflected on the upper half of the reflector, light reflected by the shade is reflected on the reflector. The light is reflected in half, is reflected again by the reflector, and is emitted to the front of the lamp through the lower half of the lens.

The light reflected by the upper half of the reflector passes through the second focal point of the reflector and exits from the lower half of the lens to the front of the lamp as in the prior art. In this case, both the light reflected by the upper half of the reflector and the light reflected by the lower half pass through the lower half of the lens and are emitted to the front of the lamp, and about twice as much light as conventional light is emitted. It will be emitted.

Therefore, the light distribution diagram of the light emitted forward through the lens has the same shape as that of the conventional example shown in FIG.
The brightness is about twice that of the conventional example.

That is, it is possible to obtain a lamp having about twice the brightness of a conventional lamp. Alternatively, if the conventional brightness is sufficient, the input power may be reduced to about half. Normally, the light distribution characteristics including the brightness are determined, so that the input power can be halved. That is, it is effective for energy saving.

The basic structure of the second embodiment of the present invention is the same as that of the first embodiment except for the shape of the shade 7.
This embodiment is characterized in that the upper shape subjected to the reflection processing of the shade (FIG. 4) is made convex.

Since the upper side of the shade is convex,
The light reflected by the lower half of the reflector and hitting the shade is reflected by the upper half of the reflector, so that the light is reflected again by the reflector, passes through the lower half of the lens, and exits in front of the lamp.

The light reflected by the upper half of the reflector passes through the second focal point of the reflector and exits from the lower half of the lens to the front of the lamp as in the prior art. In this case, both the light reflected by the upper half of the reflector and the light reflected by the lower half pass through the lower half of the lens and are emitted to the front of the lamp, and about twice as much light as conventional light is emitted. It will be emitted.
The light distribution diagram of the light emitted forward through the lens has the same shape as that of the conventional example shown in FIG. 3, but the brightness is about twice that of the conventional example. Is the same as

This means that a lamp having approximately twice the brightness of the conventional lamp can be obtained. Alternatively, if the conventional brightness is sufficient, the input power may be reduced to about half. Normally, the light distribution characteristics including the brightness are determined, so that the input power can be halved. That is, it is effective for energy saving.

The basic structure of the third embodiment of the present invention is the same as that of the first embodiment except for the shape of the shade 8.
This embodiment is characterized in that the upper shape to which the reflection processing of the shade (FIG. 5) is applied is made spherical around the second focal point of the reflector.

Light reflected by the lower half of the reflector and hitting the shade is reflected back by the shade having a spherical shape centered on the second focal point of the reflector in the incident direction.
It is returned to the lower half of the reflector. At this time, the light returned to the second focal point of the reflector is returned to the light source which is the first focal point of the reflector. The light returned from the lower half of the reflector to the light source goes to the upper half of the reflector,
There it is reflected towards the second focal point of the reflector. This light is emitted to the front of the lamp through the lower half of the lens.

The light reflected by the upper half of the reflector passes through the second focal point of the reflector and exits from the lower half of the lens to the front of the lamp as in the prior art. In this case, both the light reflected by the upper half of the reflector and the light reflected by the lower half pass through the lower half of the lens and are emitted to the front of the lamp, and about twice as much light as conventional light is emitted. It will be emitted.
The light distribution diagram of the light emitted forward through the lens has the same shape as that of the conventional example shown in FIG. 3, but the brightness is about twice that of the conventional example. Is the same as

This means that a lamp having approximately twice the brightness of a conventional lamp can be obtained. Alternatively, if the conventional brightness is sufficient, the input power may be reduced to about half. Normally, the light distribution characteristics including the brightness are determined, so that the input power can be halved. That is, it is effective for energy saving. This is the same as in the first embodiment.

[0030]

According to the present invention, a reflector using a part of an elliptical shape and a light source at its first focal point, an aspherical lens provided in front of the light source, and a lamp provided near the second focal point of the reflector are provided. In a so-called projection type vehicle lamp, which comprises a shade for obtaining a light distribution characteristic, a light source side of the shade reflects light reflected from a lower half of the reflector to an upper half portion of the reflector. Because of the reflection treatment, the light reflected by the lower half of the reflector in the conventional lamp was invalidated, but this light can now be used effectively. Therefore, a brighter lamp than before was obtained.
If the brightness is the same as before, the input power to the bulb can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a first embodiment of a lamp of the present invention.

FIG. 2 shows a shade according to the first embodiment of the lamp of the present invention.

FIG. 3 shows a light distribution diagram of the lamp of the present invention, a conventional example.

FIG. 4 shows a shade according to a second embodiment of the lamp of the present invention.

FIG. 5 shows a shade according to a third embodiment of the lamp of the present invention.

FIG. 6 is a vertical sectional view of a conventional lamp.

[Explanation of symbols]

 1, 90, lamp 2, 91, light source 3, 92, reflector 4, 93, lens 5, 7, 8, 94, shade 6, reflection processing F1, F91, first focus F2, F92 ..Second focus

Claims (3)

[Claims] 1. A light source having a reflector using a part of an elliptical shape, a light source provided at a first focal point thereof, an aspheric lens provided in front of the light source, and a light fixture provided near a second focal point of the reflector. Composed of shades to get
In a so-called projection type vehicle lamp, a reflection process is performed on a light source side of the shade so as to reflect light reflected from a lower half of the reflector to an upper half portion of the reflector. Vehicle lighting. 2. A shade for a vehicle lamp according to claim 1, wherein the shade portion for performing the reflection processing has a convex shape on the light source side. 3. A shade for a vehicle lamp according to claim 1, wherein a shade portion for performing said reflection processing has a spherical shape on the light source side around said second focal point.