Vehicle lamp

A technology for lamps and vehicles, applied in the direction of headlights, vehicle parts, lighting and heating equipment, etc., can solve the problems of astigmatism and coma aberration not necessarily sufficient, the boundary of the lighting area is blurred, and the definition of the peripheral edge is reduced, etc. Achieve the effect of suppressing spherical aberration and improving sharpness

Active Publication Date: 2019-03-29
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The projection lens of Patent Document 1 is effective in improving chromatic aberration, but astigmatism and coma aberration are not necessarily sufficient, and the sharpness of each peripheral portion of a plurality of illumination areas and the peripheral portion of a combined illumination area is affected by these aberrations. lowered, blurred boundaries of illuminated areas

Method used

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  • Vehicle lamp
  • Vehicle lamp
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Embodiment Construction

[0039] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following embodiments, although various limitations are made to constituent elements, types, combinations, shapes, relative arrangements, etc., these are merely examples, and the present invention is not intended to limited to this.

[0040] figure 1 It is a vertical cross-sectional view of the concept of applying the present invention to an automobile headlamp HL using ADB light distribution control. In the following description, regarding the front or the rear, the light source side of the headlamp HL is referred to as the rear, and the front side of the headlamp HL is referred to as the front.

[0041] In the headlamp HL, a lamp housing 1 is formed by a lamp body 11 and a front cover 12 made of a translucent material, and a lamp unit 2 is housed in the lamp housing 1 . The lamp unit 2 is configured such that the inner surface serves as a light ref...

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Abstract

The invention provides a vehicle lamp that is provided with a projection lens which has a high sharpness capable of clarifying the boundary of the illumination areas. Disclosed is a vehicle lamp including a projection lens (4) that projects light emitted from the light source. The projection lens is constituted by a triplet lens including a first lens (41) having a positive refractive power, a second lens (42) having a negative refractive power, and a third lens (43) having a positive refractive power, and a first inter-lens distance (t1) between the first lens (41) and the second lens (42), asecond inter-lens distance (t2) between the second lens (42) and the third lens (43), and a total lens thickness (T) of the projection lens 4 are in a relationship that satisfies 0.03<t1/T<0.1 and 0.03<t2/T<0.1.

Description

technical field [0001] The present invention relates to lamps used in vehicles such as automobiles, and more particularly to suitable vehicle lamps such as headlamps that can perform ADB (Adaptive Driving Beam, Adaptive Driving Beam) light distribution control. Background technique [0002] As the headlights of automobiles, in order to improve the lighting effect of the front area of ​​the self-vehicle on the one hand, and on the other hand to prevent the vehicles existing in the front area of ​​the self-vehicle such as the preceding vehicle or the oncoming vehicle existing in the front area ( Hereinafter, it is referred to as "the vehicle in front") that dazzles the light distribution. As one of the methods, ADB light distribution control is recommended. In this ADB light distribution control, a vehicle in front is detected by a vehicle position detection device, and control is performed to reduce the amount of light in the detected area where the vehicle in front is presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S41/25F21V5/00F21V5/04F21V23/04F21V33/00F21W102/13F21Y115/10
CPCF21S41/25F21V5/007F21V5/04F21V23/04F21V33/0052F21Y2115/10F21W2102/13B60Q1/143F21S41/255F21S41/265F21S41/153F21S41/663F21S41/143B60Q2300/41B60Q2300/056F21S41/141F21W2102/00F21S41/27B60Q1/1423F21S41/151
Inventor 本桥和也
Owner KOITO MFG CO LTD
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