Nalux Co., Ltd.

Other

Stanley Electric Co., Ltd

Kenta Ishii

Daisuke Seki

Norihisa Sakagami

Keiji Ikemori

Sadayuki Konishi

Kayuri Kinoshita

Tetsuya Zenko

Chang Shih-Yuan

An imaging optical system wherein the number of lenses is three to seven, one to four lenses, each of which is an aspheric lens in which radius of curvature of each of both surfaces is infinity in the paraxial region and which has a power of the third-order aberration region in the peripheral area are provided, the first lens from the object side is a negative lens or the aspheric lens, the relationship

Imaging optical system

A lens for headlamps of vehicles provided with a diffraction grating on a surface, wherein a phase function of the diffraction grating is represented by where r represents distance from the central axis of the lens, and the relationship|&#x3b2;|&#xb7;(0.3)&#x3c;|&#x3b2;|&#xb7;(0.3)is satisfied where R represents effective radius of the lens, and wherein a second derivative of the phase function has at least one extreme value and at least one point of inflection where r is greater than 30% of R, a difference in spherical aberration between the maximum value and the minimum value at any value of r in0&#x2264;is equal to or less than the longitudinal chromatic aberration for visible light, the diffraction grating is at least partially on the surface where r is greater than 30%, and the relationship is satisfied.

Lens for headlamps of vehicles and method of using lens for headlamps of vehicles

An illumination optical system having a light source and a single convex lens with a diffractive structure, wherein the phase function of the diffractive structure is represented by where r represents distance from the central axis of the lens, the relationship|&#x3b2;|&#xb7;(0.3)&#x3c;|&#x3b2;|&#xb7;(0.3)is satisfied where R represents effective radius of the lens, the second derivative of the phase function has at least one extreme value and at least one point of inflection where r is greater than 30% of R, and the area of a surface of the light source is equal to or greater than 3% of the area of the entrance pupil when the light source side of the lens is defined as the image side.

Illumination optical system

The imaging optical system is provided with a first lens having a negative refractive power, a second lens having a positive refractive power, an aperture stop, and a third lens having a positive refractive power, disposed from the object side to the image side. With |d| being the distance between the image-side principal point of the first lens and the object-side principal point of the second lens, d=&#x2212;|d| being the signed distance between the image-side principal point of the first lens and the object-side principal point of the second lens when the image-side principal point of the first lens is further towards the image side than the object-side principal point of the second lens, and f12 being the composite focal length of the first lens and the second lens, the relationships d&#x3c;0 and 0.005&#x3c;d/f12&#x3c;16 are established.

Growing community of inventors

Osaka, Japan

Kenta Ishii