An imaging lens set includes a plastic lens element. The plastic lens element having a central axis includes an object-side surface and an image-side surface, wherein the image-side surface is located opposite to the object-side surface. Each of the object-side surface and the image-side surface includes an effective optical section and a lens peripheral section in order from the central axis to an edge of the plastic lens element. The effective optical section is for being passed through by an imaging light and aspheric. The lens peripheral section surrounds the effective optical section. At least one of the lens peripheral section of the object-side surface and the lens peripheral section of the image-side surface includes at least one annular groove structure, wherein the annular groove structure includes a plurality of stepped surfaces and is not in contact with the optical elements.

An annular optical element having an optical axis includes an outer diameter surface, an inner annular surface, an object-side surface and an image-side surface. The object-side surface includes an annular reflecting surface, an annular auxiliary surface and a connecting surface. The annular reflecting surface is inclined with the optical axis. The annular auxiliary surface is closer to the optical axis than the annular reflecting surface is to the optical axis. The connecting surface is for connecting to an optical element, wherein the connecting surface is closer to the optical axis than the annular auxiliary surface is to the optical axis. The image-side surface is located opposite to the object-side surface and includes an annular optical surface. A V-shaped groove is formed by the annular auxiliary surface and the annular reflecting surface of the object-side surface.

According to various embodiments of the present invention, an optical capture system is provided. In one embodiment, a micro-scale optical capturing system is provided with low divergence (approximately 1°) of the incident light and low acceptance angle (<8°) of the captured light. According to embodiments, a micro-scale optical capturing system is provided with a large number of collimated high-power white LEDs as light sources, between 60 and 100 units, for example, and may be positioned at distances of about 650 mm from the sample. In one embodiment, a digital camera using 50 mm focal objective with a 25 mm length extension tube captures images of the sample. This provides a working distance of approximately 100 mm and at the same time maintains ×0.5 magnification for microscale captures, with an image size of 4×4 microns per pixel.

A camera optical lens is provided. The camera optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens that are sequentially arranged from an object side to an image side. The second lens has a positive refractive power. At least one of the first lens to the seventh lens includes a free-form surface. The camera optical lens satisfies: 1.00≤f2/f≤4.00 and R1≤0, where f denotes a focal length of the camera optical lens, f2 denotes a focal length of the second lens, and R1 denotes a central curvature radius of an object-side surface of the first lens. The camera optical lens can achieve good optical performance and meet the requirement of being ultra-thin and having a wide-angle and a large apertures.

The disclosure provides an imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis, a movable diaphragm, a first lens with a positive refractive power, a second lens with a negative refractive power, a third lens with a refractive power, a fourth lens with a refractive power, a fifth lens with a refractive power and a sixth lens with a negative refractive power, wherein TSmin is a distance from the movable diaphragm at a minimum distance from an imaging surface of the imaging lens assembly to an object-side surface of the first lens on the optical axis, TSmax is a distance from the movable diaphragm at a maximum distance from the imaging surface of the imaging lens assembly to the object-side surface of the first lens on the optical axis and EPDmin is a minimum entrance pupil diameter of the imaging lens assembly.

An optical system includes a partial reflector having an average optical reflectance of at least 30% in a desired plurality of wavelengths, a display panel disposed to emit image light toward the partial reflector, and a multilayer reflective polarizer disposed proximate the partial reflector. The multilayer reflective polarizer is curved about two orthogonal axes and includes at least one layer substantially optically uniaxial at at least one location. The image light is transmitted by the multilayer reflective polarizer after it is first reflected by the multilayer reflective polarizer. A quarter wave retarder may be disposed between the reflective polarizer and the partial reflector.

An example electronic device includes a window including a first surface and a second surface that faces the direction opposite to that of the first surface; a lens housing disposed in the internal space of the electronic device; and an optical lens module including a lens assembly aligned toward the second surface of the window in the lens housing, wherein the window includes: a window lens area formed on the first surface or the second surface; and an alignment guide formed on the perimeter of the window lens area for aligning the window lens area and the lens assembly.

A meta lens includes a first lens surface, and a second lens surface provided opposite to the first lens surface, wherein at least one of the first lens surface and the second lens surface is a metasurface including a plurality of nanostructures having a sub-wavelength dimension that is less than a central wavelength λ.sub.0 in an operation wavelength band of the meta lens, and wherein a deflection property of the first lens surface and a deflection property of the second lens surface based on positions of incident light are opposite to each other in at least some regions of each of the first lens surface and the second lens surface.

Imaging systems and methods are provided for taking high-magnification photographs confined to a small physical volume. In some embodiments the system is composed of at least one lens, one or more partially reflective elements, and a sensor. The partial reflectors reflect a portion of the light back and forth between them to allow a long path length for a portion of the light from the lens to the sensor which enables a high magnification.

One embodiment provides an imaging device, including: a sparsely-filled optical aperture having a shape forming an outer portion of the optical aperture, wherein at least a portion of an inner portion formed by the outer portion of the optical aperture is not a part of the optical aperture; and imaging optics, wherein the imaging optics include at least one reflection device optically located after the optical aperture and at least one imaging sensor optically located after the at least one reflection device, wherein light entering the optical aperture reflects from the at least one reflection device onto the at least one imaging sensor. Other embodiments are described herein.