Koito Manufacturing Company, Ltd.

Naoki Kawabata

Tomoyuki Ichikawa

Satoshi Kikuchi

Ryosuke Matsuhana

Norito Takahashi

Mitsuharu Mano

Kentarou Murakami

Yuta Maruyama

Shuji Matsuura

Hirotaka Sawada

Keisuke Inagaki

Tomoki Wakasugi

A vehicle headlight includes: an image generation unit; a light source unit configured to emit light based on an image generated by the image generation unit; and a memory configured to store a reference image for forming a reference light distribution pattern and a plurality of additional images, in which each of the plurality of additional images is one of a plurality of darkened images, and a plurality of brightened images, and the image generation unit generates the image for forming a predetermined light distribution pattern by light emitted from the light source unit by selecting at least one additional image and superimposing the selected additional image on a part of the reference image, the predetermined light distribution pattern being obtained by changing an amount of light of a predetermined region overlapping a predetermined target object in the reference light distribution pattern.

Vehicle headlight having an imaging generation unit and a matrix light source unit for producing overlapping images in a light distribution

A light distribution controller controls a light distribution variable lamp including a plurality of pixels arranged in an array. The processor executes the software program to generate at least one image defining the light distribution of the light distribution variable lamp, and writes the image in the volatile memory. A monitoring microcontroller detects an abnormality of the processor. A hardware logic circuit (i) generates a light distribution image data to be output to the light distribution variable lamp on the basis of at least one image written in the volatile memory in a normal state of the processor, and (ii) generates a light distribution image data on the basis of the generated auxiliary image without depending on the processor in an abnormal state of the processor.

Vehicle lamp system and light distribution controller

A controller pulse width modulation (PWM) controls multiple light-emitting pixels arranged in an array that form a variable light distribution lamp. A common counter is provided in common for the multiple light-emitting pixels, and generates a common count value having a ramp waveform. A signal processing unit generates multiple duty cycle instruction values for specifying the duty cycles of the multiple light-emitting pixels according to a light distribution instruction. Furthermore, the signal processing unit stores multiple offset values that correspond to the multiple light-emitting pixels, generates an individual count value for each light-emitting pixel by adding the corresponding offset value to the common count value, and generates individual PWM signals pwmthrough pwmn that correspond to results of comparison between the individual count values and the corresponding duty cycle instruction values.

Automotive lamp system

A lighting circuit turns on a plurality of semiconductor light sources. Multiple current sources are each coupled to a corresponding semiconductor light source. A switching converter supplies a driving voltage Vacross each of multiple series connection circuits each formed of the semiconductor light source and the current source. A converter controller employing a ripple control method turns on a switching transistor of the switching converter in response to a voltage across any one of the multiple current sources decreasing to a bottom limit voltage.

Lighting circuit of automotive lamp

A vehicle lamp includes a first lamp unit that includes a light source, a driving unit, and a reflective body that is driven by the driving unit to repeat a periodic motion and thus scans an exit beam from the light source; and a controlling unit that controls the first lamp unit. The controlling unit instructs that the driving unit be driven until a first duration Thas passed even in a case where the controlling unit has received an illumination instruction instructing the first lamp unit to emit a beam and then received a stop instruction instructing the first lamp unit to stop emitting a beam.

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Shizuoka, Japan

Naoki Kawabata