Vehicle headlight and projection lens

A vehicle headlight having an optical axis extending in a front-to-rear direction of a vehicle body on which the vehicle headlight is to be mounted, the vehicle headlight comprising:

• a projection lens disposed on the optical axis, the projection lens including a light emitting surface, a light incident surface on which light to be projected through the light emitting surface is incident, and a reference point disposed to face the light incident surface;
• and
• a light source disposed substantially at the reference point, the light source emitting white light to be incident on the light incident surface to enter the projection lens and be projected forward through the light emitting surface, wherein
• the light source is configured to emit white light by color mixture of at least a first color light and a second color light so that white light directed in a direction of the optical axis contains a relatively larger amount of the first color light than the second color light while white light directed in an oblique direction with respect to the optical axis by a certain angle contains a relatively larger amount of the second color light than the first color light,
• the light source includes at least one semiconductor light emitting device configured to emit the first color light and a light transmitting member configured to absorb at least part of the first color light from the semiconductor light emitting device and convert the first color light into the second color light,
• a ratio of an amount of the first color light contained in the white light directed toward the optical axis is large than a ratio of an amount of the first color light contained in the white light directed in the oblique direction by a larger angle with respect to the optical axis,
• at least one of the light emitting surface and the light incident surface includes a surface configured to control the light from the light source at the reference point such that at least a portion of light incident on the light incident surface at an incident position on the optical axis or a first incident position near the optical axis is directed in a direction not parallel to the optical axis, the surface also configured to control light incident on the light incident surface at a second incident position away from the optical axis to be directed in a direction parallel to the optical axis, and the surface also configured to control light incident on the light incident surface at an incident position between the first incident position and the second incident position to be directed in a direction closer to the direction parallel to the optical axis as the light is incident on the light incident surface at an incident position closer from the first incident position to the second incident position,
• a right portion of any one of the light incident surface and the light emitting surface on a right side with respect to a vertical plane including the optical axis has a horizontal cross section configured to control the light emitted from the light source at the reference point and directed in a 0° direction with respect to the optical axis to a direction rightward by a first predetermined right angle with respect to the optical axis and also control the light emitted from the light source at the reference point and directed in directions ranging from the 0° direction to a direction rightward by a second predetermined right angle with respect to the optical axis to directions rightward by the predetermined right angle to the 0° direction as the direction of light emission is gradually changed from 0° to the second predetermined right angle rightward, and
• a left portion of any one of the light incident surface and the light emitting surface on a left side with respect to the vertical plane including the optical axis has a horizontal cross section configured to control the light emitted from the light source at the reference point and directed in a 0° direction with respect to the optical axis to a direction leftward by a first predetermined left angle with respect to the optical axis and also control the light emitted from the light source at the reference point and directed in directions ranging from the 0° direction to a direction leftward by a second predetermined left angle with respect to the optical axis to directions leftward by the first predetermined left angle to the 0° direction as the direction of light emission is gradually changed from 0° to the second predetermined left angle rightward.