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Vehicle front headlight device

a technology for headlight devices and vehicles, applied in semiconductor devices, lighting and heating apparatus, instruments, etc., can solve problems such as the overall decrease of light illumination intensity, and achieve the effect of suppressing the reduction of light illumination intensity

Active Publication Date: 2019-11-21
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The vehicle front headlight device described in this patent allows for two regions of illumination to partially overlap, resulting in higher illumination intensity in the overlap area. This helps to prevent the driver of a leading vehicle from being dazzled. In summary, the technical effect of this device is to improve headlighting while driving and to reduce glare for the driver.

Problems solved by technology

In such optical units, however, enlarging the high beam light distribution area in the vehicle width direction or a vehicle vertical direction while maintaining the same number of light sources (LEDs or the like) results in an overall decrease in light illumination intensity.

Method used

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  • Vehicle front headlight device
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  • Vehicle front headlight device

Examples

Experimental program
Comparison scheme
Effect test

first exemplary embodiment

[0047]As illustrated in FIG. 2 and FIG. 3, the high beam units 18 applied with the vehicle front headlight device 10 according to a first exemplary embodiment each include a light source 20 that emits visible light, a rotating mirror 30 that reflects the visible light emitted from the light source 20, and a single lens 32 that transmits the visible light reflected by the rotating mirror 30 and illuminates (projects) the visible light ahead (to the exterior of) the vehicle 12.

[0048]The light source 20 is configured by plural (for example, eight) light emitting diodes (LEDs) arranged on a substrate 22 so as to form a single row with no gaps present between the LEDs. The substrate 22 is disposed on a heat sink 24 (see FIG. 3). The light source 20 (the respective LEDs) is electrically connected to a controller 40 (see FIG. 1), and the light source 20 is switched on and off not only by switch operation by a driver, but also under the control of the controller 40.

[0049]A front surface of ...

second exemplary embodiment

[0079]Explanation follows regarding a vehicle front headlight device 10 according to a second exemplary embodiment. Locations equivalent to those of the first exemplary embodiment described above are allocated the same reference numerals, and detailed explanation thereof is omitted as appropriate.

[0080]As illustrated in FIG. 6, in the vehicle front headlight device 10 according to the second exemplary embodiment, the high beam light distribution area Ha is enlarged in the vehicle vertical direction. Namely, in the second exemplary embodiment, the rotating mirror 30 is configured including a first mirror body 28A with a curvature that reflects light upward, and a second mirror body 28B with a curvature that reflects light downward.

[0081]Accordingly, in the second exemplary embodiment, the high beam light distribution area Ha is formed by a first illuminated region HaU of light reflected by the first mirror body 28A and radiated toward an upper side ahead of the vehicle 12, and a seco...

third exemplary embodiment

[0099]Explanation follows regarding a vehicle front headlight device 10 according to a third exemplary embodiment. Locations equivalent to those of the first exemplary embodiment and the second exemplary embodiment described above are allocated the same reference numerals, and detailed explanation thereof is omitted as appropriate.

[0100]As illustrated in FIG. 8 and FIG. 9, in the vehicle front headlight device 10 according to the third exemplary embodiment, the high beam light distribution area Ha is enlarged in the vehicle vertical direction. Namely, in the third exemplary embodiment, the rotating mirror 30 is configured including a first mirror body 28A with a curvature that reflects light upward, a third mirror body 28C with a curvature that reflects light downward, and a second mirror body 28B with a curvature that reflects light substantially toward the vehicle vertical direction central region

[0101]Accordingly, in the third exemplary embodiment, the high beam light distributio...

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PUM

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Abstract

A vehicle front headlight device includes a light source, a rotating mirror that is configured by disposing a first minor body and a second mirror body around a circumferential direction of a shaft, that is rotationally driven about the shaft and rotates while reflecting light emitted by the light source, a lens that transmits light reflected by the rotating mirror so as to illuminate the light forward, and a controller for controlling rotational drive of the rotating mirror. A first illuminated region of light that is reflected by the first mirror body and that is radiated forward through the lens, and a second illuminated region of light that is reflected by the second mirror body and that is radiated forward through the lens, are offset from each other in a vehicle width direction or in a vehicle vertical direction.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority under 35 USC 119 from Japanese Patent Application No. 2018-096045 filed May 18, 2018, the disclosure of which is incorporated by reference herein in its entirety.BACKGROUNDTechnical Field[0002]The present disclosure relates to a vehicle front headlight device.Related Art[0003]Optical units (vehicle front headlight devices) have been proposed in which a rotating mirror is capable of changing a high beam light distribution area (illuminated region) in a vehicle width direction (see Japanese Patent No. 5722882).[0004]In such optical units, however, enlarging the high beam light distribution area in the vehicle width direction or a vehicle vertical direction while maintaining the same number of light sources (LEDs or the like) results in an overall decrease in light illumination intensity.[0005]Accordingly, the present disclosure obtains a vehicle front headlight device capable of suppressing a decrease in ligh...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60Q1/14F21S41/30
CPCF21S41/30B60Q2300/45B60Q1/14B60Q2300/41F21S41/675F21S41/25F21S41/141F21W2102/13F21W2107/10F21Y2115/10F21S41/663F21S41/147B60Q2300/056F21S41/00G02B7/1821
Inventor MOURI, FUMIHIKOHONDA, TAKAHIKO
Owner TOYOTA JIDOSHA KK