JPH05325604A - Projector type lamp for vehicle - Google Patents

Abstract

PURPOSE:To improve the brightness of the illumination light by utilizing the whole reflected light from a reflector. CONSTITUTION:A reflector 12 is split-constituted of an upper reflector 16 and a lower reflector 17. The upper reflector 16 is formed into a composite elliptic paraboloid having an elliptic curve with focal points F1, F2 on the center vertical cross section, and the lower reflector 17 is formed into a composite paraboloid having an elliptic curve with focal points F1, F3 on the center vertical cross section. The light fed to a convex lens 15 via the focal point F1 is radiated as the horizontal light from the convex lens 15, and the light fed to the convex lens 15 via the upper side of the focal point F1 is radiated from the convex lens 15 as the downward light lower than the horizontal light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector-type lamp for a vehicle, which is suitable for use as a headlamp or fog lamp for automobiles and motorcycles.

[0002]

2. Description of the Related Art A vehicular projector type lamp 1 has, for example, a front shape shown in FIG. 7, and a sectional view (vertical section) taken along the line AA of FIG. 7 is shown in FIG. The lamp 1 is provided with a reflector 2 having an elliptic curve (focal points F1 and F2), a bulb 4 containing a filament 3, and a convex lens 5.
The filament 3 is set at the focal point F2 of the reflector 2, and the focal point F1 is matched with the focal point of the convex lens 5. The light emitted from the filament 3 is reflected by the inner surface of the reflector 2, and then the convex lens 5 emits horizontal light that does not diffuse in the vertical direction but diffuses in the horizontal direction. Further, a cross-section (horizontal cross-section) taken along the line BB of FIG.
Is shown in FIG. The shape of the reflector 2 having a horizontal cross section is a parabola that is wider than the elliptic curve of the focal points F1 and F2, and the light in the horizontal direction emitted from the convex lens 5 becomes diffused light.

[0003]

However, in the case of the conventional projector type lamp, as shown in FIG. 10, the filament 3 of the bulb 4 incorporated in the lamp 1 has a predetermined shape and is not a point light source. The light that is reflected by and then enters the convex lens 5 has an angular width of θ1 and θ2. That is, since the incident light on the convex lens 5 enters from a position deviated from the lens focus, all the emitted light from the convex lens 5 has an angular width of θ1 ′ and θ2 ′ with respect to the illumination target direction. Become light. As a result, the light distribution pattern is as shown in FIG. 11. The light distribution pattern can be used as a high beam, but cannot be used as a low beam because there is light that diffuses upward. Therefore, conventionally, when a low beam is created, FIG.
As shown in, the shade 6 is arranged below the focal point F1,
By cutting off the light incident on the convex lens 5 from the lower side of the focal point F1, a light distribution pattern as shown in FIG. 13 is obtained. However, in the conventional method, since the reflected light from the reflector 2 is cut by the shade 6, only about 60% of the reflected light can be used for light distribution, and the utilization efficiency of filament light is poor and the illumination light is not used. There was a problem that it was dark.

[0004]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems.
An object of the present invention is to provide a projector-type lamp for a vehicle in which the brightness of illumination light is improved by using all reflected light from a reflector.

[0005]

In order to achieve the above object, the present invention provides a bulb accommodating a filament for light emission, a reflector to which the bulb is attached and which has an elliptic curve, and an interval on the inner surface side of the reflector. In a projector-type lamp for a vehicle, which comprises a convex lens arranged side by side, the reflector is divided into an upper reflector and a lower reflector, and one focus of the upper reflector and the lower reflector is formed on the convex lens. The focal point is matched and the other focal points of the upper reflector and the lower reflector are set at positions shifted by the length of the filament of the bulb.

[0006]

According to the present invention, when the projector type lamp is operated, the light emitted upward from the filament of the bulb is reflected by the upper reflector and then passes through the focal point of the convex lens and the upper side thereof and is incident on the convex lens. On the other hand, the light emitted downward from the filament is reflected by the lower reflector and then passes through the focal point of the convex lens and the upper side thereof to enter the convex lens.
As a result, the light emitted from the convex lens becomes a light that spreads horizontally and downward, and the downward diffused light has a spread corresponding to the length of the filament, but the diffused light in the horizontal direction does not spread upward and downward. The focal points of the reflectors are different, so that the reflectors spread widely. Therefore, it is possible to utilize all the light that strikes the upper and lower reflectors from the filament of the bulb, and it is possible to greatly improve the brightness of the illumination light as compared with the conventional case. Further, as in the conventional case where a shade is arranged between the reflector and the convex lens, light is interrupted at the shade arrangement portion, so that it is possible to prevent a problem that a rainbow occurs due to the prism effect of the convex lens.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 is an external configuration example of a vehicle equipped with the vehicle projector-type lamp of the present embodiment. A projector-type headlamp H is disposed in the front of the vehicle, and a projector-type headlamp H is provided in the front of the vehicle. The fog lamp F is provided.

The above headlamp (in the case of a low beam)
The projector type lamp 11 of the present embodiment applied to a lamp or a fog lamp (when cutting diffused light on the upper side) is shown in FIG.
As shown in FIG.
And a bulb 14 mounted on the reflector 12 and accommodating the filament 13, and a convex lens 15 arranged in front of the bulb 14. in this case,
A high beam headlamp or fog lamp has the structure shown in FIG. 10 and the light distribution pattern shown in FIG. 11.

The reflector 12 of the projector type lamp 11 of this embodiment is divided into an upper reflector 16 and a lower reflector 17 by a horizontal line, as shown in FIG. Upper reflector 16
Has a complex elliptical parallelepiped having the elliptic curves of the focal points F1 and F2 in the central vertical section, and the lower reflector 17 has a complex elliptic parallelepiped having the elliptic curve of the focal points F1 and F3 in the central vertical section. have. By configuring the reflector 12 with the above structure, a light distribution pattern as shown in FIG. 3 is obtained. As a result, the brightness of the projector-type lamp 11 of this embodiment is about double that of the conventional one.

Further, the projector type lamp 1 of this embodiment is used.
1 will be described in detail. The focal point of the convex lens 15 is F1, which is matched with the elliptic curve focal point F1 of the upper reflector 16 and the elliptic curve focal point F1 of the lower reflector 17.
Since the filament 13 of the bulb 14 has a predetermined longitudinal dimension, the elliptic curve focus F2 of the upper reflector 16 is set at the front end portion of the filament 13 and the elliptic curve focus F3 of the lower reflector 17 is set. Filament 1
It is set at the rear end of 3. In addition, the upper reflector 16
Has a complex elliptical parallelepiped having an elliptic curve of the focal points F1 and F2 in the vertical cross section at the center, and the lower reflector 17 has the focal points F1 and F2.
Since it has a compound elliptic parallelepiped having an F3 elliptic curve in the vertical cross section at the center, as shown in FIG. 1, the two are deviated from the conventional configuration.

Next, the operation of the projector-type lamp for a vehicle according to the present embodiment having the above-described structure during operation will be described.

When the projector lamp 11 for a vehicle is operated, light is emitted during the width of the bulb 14 and between the focal point F2 and the focal point F3.
The light emitted to 6 is spread in angle by the width. Of the light reflected from the reflector 16, the light emitted from the focus F2 enters the convex lens 15 via the focus F1.
On the other hand, since the focal point F2 is located on the tip side in the longitudinal direction of the bulb 14, light emitted from other than the focal point F2 enters the convex lens 15 via the upper side of the focal point F1. The light incident on the convex lens 15 via the focal point F1 is emitted as horizontal light from the convex lens 15, but the light incident on the convex lens 15 via the upper side of the focal point F1 is converted to the convex lens 15.
The light is emitted downward from the horizontal.

Similarly, from the valve 14 to the lower reflector 1
The light emitted to 7 also expands in angle. Reflector 1
Of the reflected light from 7, the light emitted from the focus F3 is the focus F1.
The light enters the convex lens 15 via. On the other hand, light emitted from other than the focus F3 passes through the upper side of the focus F1 and the convex lens 1
Incident on 5. Then, the convex lens 1 is passed through the focal point F1.
The light that has entered 5 is emitted as horizontal light from the convex lens 15, but the light that has entered the convex lens 15 via the upper side of the focal point F1 is emitted from the convex lens 15 as light that is downward from the horizontal.

That is, the light emitted from the convex lens 15 is only light that has a horizontal and downward spread. Further, the reflector 12 is a compound ellipse in which the upper reflector 16 and the lower reflector 17 have a parabola in which each elliptic curve is opened in the horizontal sectional direction, similarly to the horizontal section of the basic structure of the projector type lamp shown in FIG. Since it is configured as a paraboloid, when the light reflected by the reflector 12 passes through the convex lens 15 and exits, it becomes light that spreads in the horizontal direction.

Therefore, the light emitted from the convex lens 15 is
The light diffuses horizontally and downward, and the downward diffused light corresponds to the dimension of the filament 13 of the bulb 14 in the longitudinal direction, but the diffused light in the horizontal direction has the focus of the reflector 12 on the upper side and the lower side. As a result, the light distribution pattern becomes a pattern that spreads in the horizontal direction with the upper side cut as shown in FIG.

As described above, according to the vehicular projector-type lamp of this embodiment, the reflector 12 is divided into the upper reflector 16 and the lower reflector 17, and the bulb 14 is divided.
Since all the light that hits each of the reflectors 16 and 17 from the filament 13 can be used and the cut line of the light is also formed, the brightness of the illumination light emitted from the projector-type lamp can be greatly increased (about 2 Can be doubled). Further, as in the case where the shade is arranged as in the conventional case, since the light is interrupted at the shade arrangement portion, it is possible to eliminate the defect that a rainbow is generated due to the prism effect of the convex lens, which is preferable.

Next, a modification of this embodiment will be described. FIG. 4 shows the structure of a reflector 22 of a projector-type lamp for a vehicle of a modified example, and the reflector 22 is divided into an upper reflector 26 and a lower reflector 27. In this case, when the reflector 22 is viewed from the front,
The right side from the center of the reflector is divided by a horizontal line,
The left side from the center of the reflector is divided by diagonal lines that rise upward to the left. Since the upper reflector 26 has a complex elliptical parallelepiped surface having the elliptic curves of the focal points F1 and F2, and the lower reflector 17 has the complex elliptical parallelepiped surface having the elliptic curves of the focal points F1 and F3. It is possible to obtain a light distribution pattern having a cut line rising to the left as shown in FIG. It is also possible to divide the reflector 22 by an oblique line in which the right side from the center of the reflector rises to the upper right, contrary to FIG.
In this case, the light distribution pattern has a cut line that rises to the right.

[0018]

As described above, according to the present invention,
The reflector is divided into an upper reflector and a lower reflector, and one focus of the upper reflector and the lower reflector is made to match the focus of the convex lens, and the other focus of the upper reflector and the lower reflector is made the length of the bulb filament. Since it is set to each position shifted by the amount, it is possible to use all the light that hits the upper and lower reflectors from the filament of the bulb,
Compared with the conventional case, the brightness of the illumination light can be significantly improved. In addition, since light incident on the convex lens from the lower side of the focal point of the convex lens can be cut without arranging a shade between the reflector and the convex lens, as in the conventional case where the shade is arranged between the reflector and the convex lens, the shade distribution is reduced. Since the light is interrupted at the installation portion, it is possible to prevent the problem that a rainbow occurs due to the prism effect of the convex lens.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vehicle projector type lamp according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the reflector of this embodiment as viewed in the direction of FIG. 1C.

FIG. 3 is a light distribution pattern diagram of the present embodiment.

FIG. 4 is a cross-sectional view of a modified reflector.

FIG. 5 is a light distribution pattern diagram of a modified example.

FIG. 6 is an external view of a vehicle equipped with the projector type lamp of the present embodiment.

FIG. 7 is a front view of a projector-type lamp of a conventional example.

8 is a cross-sectional view taken along the line AA of FIG.

9 is a sectional view taken along the line BB of FIG.

FIG. 10 is a sectional view of a projector-type lamp of a conventional example.

FIG. 11 is a light distribution pattern diagram of a conventional example.

FIG. 12 is a sectional view of a conventional projector lamp with a shade.

FIG. 13 is a light distribution pattern diagram of a conventional example.

[Explanation of symbols]

 11 Projector Lamp 12 Reflector 13 Filament 14 Bulb 15 Convex Lens 16 Upper Reflector 17 Lower Reflector

Claims (1)

[Claims] 1. A vehicle, comprising: a bulb accommodating a filament for emitting light; a reflector to which the bulb is attached and having an elliptic curve; and a convex lens arranged on the inner surface side of the reflector with a space therebetween. In the projector type lamp, the reflector is divided into an upper reflector and a lower reflector, and one focus of the upper reflector and the lower reflector is made to match the focus of the convex lens, and the other reflector of the upper reflector and the lower reflector is made. The projector-type lamp for vehicles is characterized in that the focus of each is set at a position shifted by the length of the filament of the bulb.