An ultra-small camera module with wide field of view includes (a) a wafer-level lens system for forming, on an image plane, an image of a wide field-of-view scene, wherein the wafer-level lens system includes (i) a distal planar surface positioned closest to the scene and no more than 2.5 millimeters away from the image plane in direction along optical axis of the wafer-level lens system, and (ii) a plurality of lens elements optically coupled in series along the optical axis, each of the lens elements having a curved surface, and (b) an image sensor mechanically coupled to the wafer-level lens system and including a rectangular array of photosensitive pixels, positioned at the image plane, for capturing the image, wherein cross section of the ultra-small camera module, orthogonal to the optical axis, is rectangular with side lengths no greater than 1.5 millimeters.

Implementations of an augmented reality (AR)-capable display device for displaying light generated by a display onto a predefined field of view are disclosed herein. Within one implementation, the display device comprises a mount assembly configured to removably attach with a mobile computing device associated with the display, to thereby arrange the display with a predefined position. The display device further comprises an optical arrangement having a predefined arrangement relative to the predefined position and defining the field of view. The optical arrangement comprises a first mirror element configured to reflect a first portion of first incident light that is based on the light generated by the display, and a second mirror element disposed within the field of view and configured to reflect, onto the field of view, a second portion of second incident light that is based on the first portion.

Implementations of an augmented reality (AR)-capable display device for displaying light generated by a display onto a predefined field of view are disclosed herein. Within one implementation, the display device comprises a mount assembly configured to removably attach with a mobile computing device associated with the display, to thereby arrange the display with a predefined position. The display device further comprises an optical arrangement having a predefined arrangement relative to the predefined position and defining the field of view. The optical arrangement comprises a first mirror element configured to reflect a first portion of first incident light that is based on the light generated by the display, and a second mirror element disposed within the field of view and configured to reflect, onto the field of view, a second portion of second incident light that is based on the first portion.

Provided are an ophthalmic lens and a technique related thereto, the ophthalmic lens including two lens elements 1 and 2 having powers with different signs, in which when the Abbe number (e-line reference) of the lens element 1 having a power with a smaller absolute value is v.sub.e1, and the Abbe number (e-line reference) of the other lens element 2 is v.sub.e2, Formula 1 below is satisfied, and

v.sub.e1<v.sub.e2  (Formula 1) when a partial dispersion ratio P.sub.gF′1 between the g-line and F′-line in the lens element 1 having the power with the smaller absolute value, and a partial dispersion ratio P.sub.gF′2 between the g-line and F′-line in the other lens element 2 are set, the following Formula 2 is satisfied.

P.sub.gF′1>P.sub.gF′2  (Formula 2)

Provided are an ophthalmic lens and a technique related thereto, the ophthalmic lens including two lens elements 1 and 2 having powers with different signs, in which when the Abbe number (e-line reference) of the lens element 1 having a power with a smaller absolute value is v.sub.e1, and the Abbe number (e-line reference) of the other lens element 2 is v.sub.e2, Formula 1 below is satisfied, and

v.sub.e1<v.sub.e2  (Formula 1) when a partial dispersion ratio P.sub.gF′1 between the g-line and F′-line in the lens element 1 having the power with the smaller absolute value, and a partial dispersion ratio P.sub.gF′2 between the g-line and F′-line in the other lens element 2 are set, the following Formula 2 is satisfied.

P.sub.gF′1>P.sub.gF′2  (Formula 2)

Techniques disclosed herein relate to micro light emitting diodes (micro-LEDs) for a display system. A display system includes an array of micro light emitting diodes (micro-LEDs), an array of output couplers optically coupled to the array of micro-LEDs and configured to extract light emitted by respective micro-LEDs in the array of micro-LEDs, a waveguide display, and display optics configured to couple the light emitted by the array of micro-LEDs and extracted by the array of output couplers into the waveguide display. Each output coupler in the array of output couplers is configured to direct a chief ray of the light emitted by a respective micro-LED in the array of micro-LEDs to a different respective direction.

Provided is a metalens including a first metasurface including a plurality of first nanostructures disposed based on a first shape distribution, and a second metasurface spaced apart from the first metasurface at a distance greater than a central wavelength of a predetermined wavelength band, the second metasurface including a plurality of second nanostructures disposed based on a second shape distribution, wherein the metalens provides chromatic aberration for light in the predetermined wavelength band.

A compact three-surface wafer-level lens system for imaging a scene onto an image plane includes a one-sided wafer-level lens and a two-sided wafer-level lens disposed between the one-sided wafer-level lens and the image plane. The total track length of the wafer-level lens system is no more than 2.2 millimeters. The maximum transverse extent (in dimensions transverse to the optical axis) of the lens system and associated light propagating therethrough is no greater than 1.8 millimeters. The field of view angle of the lens system is at least 100 degrees.

A compact three-surface wafer-level lens system for imaging a scene onto an image plane includes a one-sided wafer-level lens and a two-sided wafer-level lens disposed between the one-sided wafer-level lens and the image plane. The total track length of the wafer-level lens system is no more than 2.2 millimeters. The maximum transverse extent (in dimensions transverse to the optical axis) of the lens system and associated light propagating therethrough is no greater than 1.8 millimeters. The field of view angle of the lens system is at least 100 degrees.

An objective optical system for an endoscope consists of, in order from an object side, a negative front group, an aperture stop, and a positive rear group. The front group includes, in order from the object side, only a negative first lens and a cemented lens formed of a negative second lens and a positive third lens cemented to each other, as lenses. The rear group includes, in order from the object side, only a positive fourth lens and a cemented lens formed of a positive fifth lens and a negative sixth lens cemented to each other, as lenses. The objective optical system for an endoscope satisfies predetermined conditional expressions.