6 results about "Imaging lens" patented technology

An imaging lens assembly includes, in order from an object side to an image side, a stop, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a concave image-side surface. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element has refractive power. The sixth lens element with refractive power has a concave image-side surface at a paraxial region thereof, wherein the image-side surface of the sixth lens element has a convex shape at an off-axis region, and both of the surfaces of the sixth lens element are aspheric. The imaging lens assembly has a total of six non-cemented lens elements with refractive power.

A method and apparatus for recalibrating a liquid lens. In one embodiment, a lens holder is provided to adjust the focal length of the lens as a function of temperature. In another embodiment, a recalibration circuit including a second lens of similar characteristics to the imaging lens is used to determine an appropriate focus. In other embodiments, an open loop calibration process is used.

Provided is an information processing device including an acquisition unit that acquires a first captured image, a second captured image, and a distance to a subject, and a derivation unit that derives an imaging position distance which is a distance between the first imaging position and the second imaging position, on the basis of a plurality of pixel coordinates for specifying a plurality of pixels of more than three pixels which are present in the same planar region as an emission position irradiated with the directional light beam on the real space and correspond to the position on the real space in each of the first captured image and the second captured image which are acquired by the acquisition unit, emission position coordinates which are derived on the basis of the distance acquired by the acquisition unit, a focal length of an imaging lens, and dimensions of imaging pixels.

The invention discloses a device for detecting the surface imperfection of a curved-surface optical element. The device comprises a lighting system and an imaging system and is characterized in that light sources are arranged in the lighting system, the imaging system comprises an imaging lens, an imaging device and a processor in signal connection with the imaging device, the light sources are arranged outside the imaging lens, and the imaging device at least comprises a coaxial imaging mechanism or a lateral imaging mechanism. The device has the advantages that on the basis of the light scattering principle, the light source evenly irradiates the surface of the curved-surface optical element, the imaging system above the curved-surface optical element detects the imaging of the curved-surface optical element, the curved-surface optical elements of different curvature radiuses can be detected, the difficulty that the surface imperfection of the curved-surface optical element cannot beautomatically detected is solved, and the device is low in cost and simple in structure.

The invention discloses a device for laser direct imaging on an uneven surface of a workpiece. The device comprises a computer control system, and at least one group of light-emitting light source, collimating mirror and imaging lens which are integrally arranged on an optical axis, and the uneven surface of the workpiece is coated with a photosensitive ink layer. The light-emitting source, the collimating lens and the imaging lens are controlled by the computer control system to integrally swing back and forth to scan points to be exposed on the photosensitive ink layer. The computer control system is used for controlling the light-emitting light source, the collimating lens, the imaging lens and the workpiece to work cooperatively, so that emergent light is subjected to multiple times of reciprocating scanning on the photosensitive ink layer, and all the points to be exposed are exposed. The invention further discloses a method for direct laser imaging on the uneven surface. According to the device and the method, the problem that laser imaging cannot be directly carried out on an uneven surface is solved.