An imaging lens substantially consists of a first lens-group, a stop and a second lens-group in this order from an object-side. The first lens-group substantially consists of three or less lenses including at least one negative lens and a positive lens. The second lens-group substantially consists of a 21st lens-group and a 22nd lens-group in this order from the object-side. The 21st lens-group substantially consists of three or less lenses and has positive refractive-power. The 22nd lens-group substantially consists of two lenses of a negative lens and a positive lens in this order from the object-side. Predetermined conditional formulas about distance on an optical-axis from a most-object-side lens surface in an entire system to an image-plane, maximum image height, distance on the optical-axis from a most-object-side lens surface in the first lens-group to a most-image-side lens surface in the second lens-group, and focal-length of the entire system are satisfied.

Imaging lens and imaging apparatus

An advantage of some aspects of the invention is to provide a virtual image display apparatus in which occurrence of luminance spots is suppressed to improve efficiency of use of illumination light. In the virtual image display apparatus of the invention, an optical-directivity changing section forms a non-uniform distribution concerning the directivity of image lights GL emitted from an image display device. Therefore, even when an angle of a light beam emitted from the image display device and effectively captured into the eye EY of an observer is substantially different depending on a position of the image display device, it is possible to form the image lights GL having directivity corresponding to such an angle characteristic of light beam capturing. It is possible to suppress occurrence of luminance spots to improve efficiency of use of illumination light.

Virtual image display apparatus

Systems and methods are described for generating restricted depth of field depth maps. In one embodiment, an image processing pipeline application configures a processor to: determine a desired focal plane distance and a range of distances corresponding to a restricted depth of field for an image rendered from a reference viewpoint; generate a restricted depth of field depth map from the reference viewpoint using the set of images captured from different viewpoints, where depth estimation precision is higher for pixels with depth estimates within the range of distances corresponding to the restricted depth of field and lower for pixels with depth estimates outside of the range of distances corresponding to the restricted depth of field; and render a restricted depth of field image from the reference viewpoint using the set of images captured from different viewpoints and the restricted depth of field depth map.

Systems and Methods for Synthesizing Images from Image Data Captured by an Array Camera Using Restricted Depth of Field Depth Maps in which Depth Estimation Precision Varies

Provided is a small-sized five-element image pickup lens which ensures a sufficient lens speed of about F2 and exhibits various aberrations being excellently corrected. The image pickup lens is composed of, in order from the object side, a first lens with a positive refractive power, including a convex surface facing the object side; a second lens with a negative refractive power, including a concave surface facing the image side; a third lens with a positive or negative refractive power; a fourth lens with a positive refractive power, including a convex surface facing the image side; and a fifth lens with a negative refractive power, including a concave surface facing the image side. The image-side surface of the fifth lens has an aspheric shape, and includes an inflection point at a position excluding an intersection point with the optical axis.

Image pickup lens, image pickup apparatus, and mobile terminal

An optical lens system for taking image comprises, in order from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface; an aperture stop; a second lens element with negative refractive power; a third lens element having a convex object-side surface; and a fourth lens element with negative refractive power having a concave object-side surface, an image-side surface of the fourth lens element being aspheric and formed with inflection points. A distance from the image-side surface of the fourth lens element to an image plane along an optical axis being BFL, a total track length of the optical lens system for taking image being TTL, and they satisfy the relation: BFL/TTL>0.12. In the optical lens system for taking image, the number of lens elements with refractive power being limited to four.

Optical lens system for taking image

Provided is a small-sized five-element image pickup lens which ensures a sufficient lens speed of about F2 and exhibits various aberrations being excellently corrected The image pickup lens is composed of, in order from the object side, a first lens with a positive refractive power, including a convex surface facing the object side; a second lens with a negative refractive power, including a concave surface facing the image side; a third lens with a positive or negative refractive power; a fourth lens with a positive refractive power, including a convex surface facing the image side; and a fifth lens with a negative refractive power, including a concave surface facing the image side The image-side surface of the fifth lens has an aspheric shape, and includes an inflection point at a position excluding an intersection point with the optical axis

Imaging lens, imaging device and portable terminal

PROBLEM TO BE SOLVED: To provide a compact imaging lens which has sufficient brightness and has satisfactorily corrected various aberrations, and is composed of five lenses.SOLUTION: The imaging lens comprises, in order from an object side: a first lens L1 which has positive refractive power and has a convex surface facing the object side; a second lens L2 which has negative refractive power and has a shape in which the object-side surface thereof has a concave surface facing the object side and the image-side surface thereof has a convex surface facing an image side, or is infinite; a third lens L3 which has positive refractive power; a fourth lens L4 which has negative refractive power and has a concave surface facing the image side; and a fifth lens L5 which has positive refractive power and has a concave surface facing the image side. The image-side surface of the fifth lens L5 has an aspherical shape and has an inflection point in a position other than an intersection with an optical axis. The imaging lens satisfies the following conditional expressions: -0.60<f1/f45<-0.25 (1) and 0.1<f/f3<1.0 (2), where f1 is the focal length (mm) of the first lens L1, f45 is the composite focal length (mm) of the fourth lens L4 and the fifth lens L5, f is the focal length (mm) of the entire system of the imaging lens, and f3 is the focal length (mm) of the third lens L3.

Imaging lens, imaging apparatus, and portable terminal

An image pickup lens includes: an aperture stop; a first lens having a positive power and including a convex surface facing an object side; a second lens having a negative power and including a concave surface facing an image side; a third lens in a meniscus shape having a positive power and including a convex surface facing the image side; and a fourth lens in a meniscus shape having a negative power and including a convex surface facing the object side. The image pickup lens satisfies predetermined conditions relating to a composite focal length of the first through third lenses, a length of an air space between the third lens and the fourth lens along the optical axis, and a curvature radius of a surface of the second lens facing the image side.

Image pickup lens, image pickup unit and mobile terminal

PROBLEM TO BE SOLVED: To provide an imaging lens composed of five lenses, which satisfactorily corrects a spherical aberration and an astigmatic aberration even when the entire lens length is shortened in accordance with the compact size of a lens unit, and which suppresses image quality degradation resulting from an eccentricity error, and to provide an imaging optical device and a digital apparatus. SOLUTION: The imaging lens LN includes, in order from an object side, a first lens L1 of positive refractive power, the convex face of which is oriented on the object side, a second lens L2, the concave face of which is oriented in the direction of the object side, a third lens L3 of positive refractive power, the fourth lens L4 of positive or negative refractive power, and a fifth lens L5 of positive or negative refractive power. Each of the first and third lenses L1 and L3 has at least one aspherical face, and satisfies the following conditional expression: 0.4 COPYRIGHT: (C)2011,JPO&INPIT

Eigo Sano

Papers

Image pickup lens, image pickup apparatus, and mobile terminal

Imaging lens, imaging device and portable terminal

Imaging lens, imaging apparatus, and portable terminal

Image pickup lens, image pickup unit and mobile terminal

Imaging lens, imaging optical device and digital apparatus