Optical imaging device
AssigneeYoung Optics Inc.
InventorsCHEN-CHENG LEE, HSIN-TE CHEN, KUO-CHUAN WANG
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Abstract
One embodiment of the invention discloses an optical imaging device including an optical lens. The optical lens has N number of lenses, and the N number of lenses are divided into a first lens group and a second lens group and have at least three aspheric lenses. The first lens group is disposed between an object side and an image side, and the first lens group has (N/2)−1 piece of lens. The first lens group includes, in order from the object side, a first lens, a second lens and a third lens, and the second lens is an aspheric lens. The second lens group is disposed between the first lens group and the image side, and an aperture stop is disposed between the first lens group and the second lens group.
Claims20
An optical imaging device, comprising:
- an optical lens comprising N number of lenses including at least three aspheric lenses, the N number of lenses comprising:
- a first lens group disposed between an object side and an image side, the first lens group having (N/2)−1 piece of lens, and the first lens group comprising, in order from the object side to the image side, a first lens, a second lens and a third lens, and the second lens being an aspheric lens;
- a second lens group disposed between the first lens group and the image side;
- and
- an aperture stop disposed between the first lens group and the second lens group, wherein a maximum field of view of the optical lens is greater than or equal to 180 degrees.
An optical imaging device, comprising:
- an optical lens having an aspheric lens, the aspheric lens having a maximum thickness ratio smaller than 4.5 measured in a direction parallel to an optical axis, the optical lens having a maximum field of view greater than or equal to 180 degrees, and the optical lens receiving an image from an object side and outputting a panoramic image to an image side;
- wherein, a ratio of the first length to the second length of the panoramic image is in the range of 30%-50%, the first length is a length of a diagonal line in the 0-100 FOV degrees sector of the panoramic image, and the second length is a length of a diagonal line of the maximum FOV sector of the panoramic image.
An optical imaging device, comprising:
- an optical lens having a maximum field of view greater than or equal to 180 degrees and forming a panoramic image to an image side;
- wherein the panoramic image is represented as a distribution line in a coordinate plot, an abscissa of the coordinate plot represents a field of view, an ordinate of the coordinate plot represents a distance ratio, the distance ratio is defined as a ratio of a first distance to a second distance, where the first distance is a distance between a point and a center of the panoramic image, the second distance is a distance between an outermost point of the panoramic image and the center of the panoramic image, the abscissa is divided, from zero to a maximum field of view, former to latter, into ten equal parts to correspondingly divide the coordinate plot into ten sectors, slopes of the distribution line of at least four sectors of the latter five sectors of the coordinate plot are respectively greater than a standard slope, and the standard slope is a slope of a straight line connected between coordinates (0, 0) and coordinates (1, 1) of the coordinate plot.
Dependencies are inferred from the claim text.