Koito Manufacturing Company, Ltd.

Toru Ito

Masaya Shido

Yoshiro Ito

Haruhiko Iyoda

Yukihiro Onoda

Tomoyuki Ichikawa

Hironori Tsukamoto

Atsushi Ozawa

Osamu Kuboyama

Tomoaki Harada

Toshiaki Tsuda

Tetsuya Suzuki

Masaru Sasaki

Yasutaka Sasaki

Takayuki Otsubo

Koji Magori

A first light emitting unit includes M (M≥2) first light emitting elements provided in series. A second light emitting unit including N (N<M) second light emitting elements and a switching transistor are provided on a path parallel to the first light emitting unit. A constant-current driver is connected in series to both the first light emitting unit and the second light emitting unit, and generates a drive current. A drive circuit includes a capacitor provided between a gate and a drain of the switching transistor, and causes the gate of the switching transistor to generate a drive signal according to a switching signal.

Light source module and lighting circuit

A semiconductor light source and a constant current circuit are arranged in series between an input terminal and a ground terminal. When an input voltage at the input terminal exceeds a predetermined threshold voltage, a load dump circuit cuts off or reduces a current that flows through the constant current circuit.

Vehicle lamp

An automotive lamp includes a temperature-sensing element having an electrical state that changes according to the temperature T of a semiconductor light source, and a constant current driver that generates a driving current Ithat corresponds to the temperature T. The maximum value of the temperature differential of the driving current Iin a first temperature range from a reference temperature Tto a first temperature T(T>T) is smaller than the maximum value of the temperature differential of the driving current Iin a second temperature range from the first temperature Tto a second temperature T(T>T).

Lighting circuit

A vehicular display device includes: a reflective display configured to provide display toward an outside of a vehicle; and a light emission member arranged to face a display part of the reflective display. The light emission member is configured to allow light to be incident from a display part side and light to be incident from an opposite side to the display part side to pass through the light emission member, and is configured to emit light toward the display part, which is different from the light to be incident from the display part side and the light to be incident from the opposite side to the display part side.

Vehicular display device

A vehicle display device mounted on a vehicle and configured to display an image to an outside of the vehicle includes: a self-luminous display unit configured to display an image to the outside of the vehicle by emitting light emitted from a light source to the outside of the vehicle; a reflective display unit configured to display an image to the outside of the vehicle by reflecting light from the outside of the vehicle; an information acquisition unit configured to acquire environment information indicating an environment outside the vehicle; and a controller configured to switch between image display by the self-luminous display unit and image display by the reflective display unit based on the acquired environment information.

Vehicle display device, method of controlling vehicle display device, and computer-readable non-transitory storage medium

A vehicle lampincludes: an organic EL element; a lighting circuitconfigured to switch between lighting and lighting-off of the organic EL element; and a lighting control unitconfigured to control the lighting circuitso as to repeat instantaneous lighting-off in a state in which the organic EL elementis to be lighted. The lighting circuitincludes a discharge pathformed at least during the instantaneous lighting-off so as to discharge accumulated charges from the organic EL element

A vehicle lamp that ensures achieving downsizing while integrating sensors and improving a designability is provided. The vehicle lamp includes a lamp function unit () and a sensor function unit (). The lamp function unit () has a light irradiating region (). The sensor function unit () is arranged within the light irradiating region () in a front view.

The present disclosure relates to a light emitting device using an organic EL. The light emitting device includes an organic EL panel where a plurality of light emitting parts is arranged toward a predetermined direction. The plurality of light emitting parts is configured such that brightness is decreased gradually toward the predetermined direction.

Light emitting device having a plurality of light emitting parts with brightnesses decreased in a direction

A vehicle lamp includes a planar light-emitting structure having a substrate on which an organic EL emission element is provided, a framing member that fixes the planar light-emitting structure inside a vehicle-lamp light cabinet, and an elastic member that is interposed between the planar light-emitting structure and the framing member and that fixes the planar light-emitting structure by its biasing force.

The present disclosure provides a vehicular lamp including an organic EL element that has only a non-light emitting point with a size of 120 &#x3bc;m or less on a light emitting surface.

Vehicular lamp, inspection method of organic EL element

Provided is a vehicular marker lamp including a planar light emitter; and a lens including an incident portion formed on a surface facing the planar light emitter. A plurality of cross-sectionally triangular prisms are arranged in the incident portion in a state where the vertexes of triangular prisms face the planar light emitter side. Each of the prisms includes an incident surface formed on one surface in the arrangement direction to make a light from the planar light emitter is incident and a light-shielding portion formed on a surface opposite to the incident surface to shield incidence of the light from the planar light emitter.

Vehicular marker lamp using planar light emitter

A light emitting device includes a planar light emitting body configured to emit light in a planar shape, and a transparent member configured to control the light from the planar light emitting body. The transparent member has a light incidence surface arranged so as to face a light emitting surface of the planar light emitting body and configured to cause the light from the planar light emitting body to be incident on the transparent member and a light emission surface configured to emit, to the outside, the light which is propagated in the transparent member. The transparent member is formed so as to extend in a predetermined direction and formed such that a distance between the light incidence surface and the light emission surface changes in accordance with a position in the predetermined direction.

Light emitting device and vehicle lamp

Provided is a vehicle lamp including: an organic EL element; and a lighting circuit that applies a voltage to the organic EL device with a rise time of the voltage of 5 milliseconds or less.

Vehicle lamp and method for inspecting organic EL element

A vehicular lamp includes a lamp body, a translucent outer cover, and a planar light source including a substrate and an organic EL light emitting layer formed on one side surface of the substrate. The planar light source has a bent portion in which the substrate having flexibility is bent at a predetermined position in a portion formed with the organic EL light emitting layer such that one end portion of the substrate is directed to one of a side of the outer cover and a side opposite to the outer cover, or the planar light source is provided such that at least part of an outer peripheral end of the organic EL light emitting layer emits light.

Vehicular lamp

A lamp unit has an organic EL panel in which an organic EL light emission portion is formed on a substrate, the organic EL panel being flexible, and a frame that fixes the light emission device so as to cover a light emission area of the organic EL, panel. The frame has a window or a transparent portion at least in a part of a portion, overlapping the light emission area, of the frame. The frame is formed with recess portions at both ends thereof to house both end portions of the organic EL panel.

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Shizuoka, Japan

Toru Ito