An observation optical system according to the present invention includes a Fresnel lens and a lens LP with a positive refractive power provided on a light incident side or a light emitting side of the Fresnel lens. A length in a direction of an optical axis from a surface vertex of a central annular section of the Fresnel lens to an end portion of the central annular section is defined as h0, and a length in the direction of the optical axis of a grating wall surface of a first annular section adjacent to the central annular section is defined as h1. The lengths h1 and h0 are set to appropriate values, respectively.

A method and apparatus for determining gaze direction information, includes a light source for forming illuminating light to an eye region of a user, and optical element(s) configured to guide the illuminating light from the light source to the eye region. The illuminating light is dynamically adjustable to generate a dynamic light beam on the eye region, and a sensor is configured to capture reflected light on the eye region and generate reflection eye data. The apparatus can maintain user profile information, adjust spectral power distribution of the light source based on the user profile information, receive the reflection eye data, and generate the gaze direction information based on the reflection eye data.

A magnifier for use while fishing comprises a bracket for temporary and convenient attachment to a cylindrical fishing rod, a magnifying lens adjustably attached to that bracket, and a rod guide stop that is inserted inside a rod guide to prevent movement of the bracket. The bracket engages a fishing rod and supports a magnifying lens that is conveniently retained in position on the fishing rod thereby enabling use of the magnifying lens by a user in proximity to the fishing rod.

The systems, devices, and methods described herein relate to eyepieces with one or more homogenous optical elements which may be configured to include one or more polymeric nanolayer gradient index (LGRIN) lenses. The one or more LGRIN lenses may replace one or more of the homogenous optical elements or be added as corrector lenses on an end of the eyepiece to provide improved optical performance of the eyepiece.

An optical apparatus includes an eyepiece optical system including a first linear polarization plate and configured to guide light from an image display element to an eye of an observer, and a second linear polarization plate disposed outside an optical path from the image display element to the eye of the observer. The first linear polarization plate is disposed closest to the observer in the eyepiece optical system. A transmission axis direction of the first linear polarization plate and a transmission axis direction of the second linear polarization plate are different from each other.

An eyepiece includes a substrate and an in-coupling grating patterned on a single side of the substrate. A first grating coupler is patterned on the single side of the substrate and has a first grating pattern. The first grating coupler is optically coupled to the in-coupling grating. A second grating coupler is patterned on the single side of the substrate adjacent to the first grating coupler. The second grating coupler has a second grating pattern different from the first grating pattern. The second grating coupler is optically coupled to the in-coupling grating.

An observation system includes: an observation device that includes an eyepiece lens and an objective and forms a real image of a sample on an optical path between the eyepiece lens and the objective; and an observation auxiliary device that is worn by a user and outputs auxiliary information to the user, the observation auxiliary device superimposing the auxiliary information on a virtual image of the sample to be observed by the user through the eyepiece lens on the basis of a relative position of the observation auxiliary device with respect to the observation device.

Techniques are described for applying an edge sealant to the edge of a multi-layer optical device. In particular, embodiments provide an apparatus that performs a precision measurement of the perimeter of an eyepiece, applying the edge sealant (e.g., polymer) based on the precision-measured perimeter, and subsequently cures the edge sealant, using ultraviolet (UV) light that is directed at the edge sealant. The curing process may be performed within a short time following the application of the edge sealant, to ensure that any wicking of the edge sealant between the layers of the eyepiece is controlled to be no greater than a particular depth tolerance. In some examples, the edge sealant is applied to the optical device prevent, or at least reduce, the leakage of light from the optical device, and also to ensure and maintain the structure of the multi-layer optical device.

A display apparatus of the present disclosure includes an eyepiece optical device and an image display device, the image display device includes an image forming device, a transfer optical device, a control unit, a first position detection device, a second position detection device, and a transfer-optical-device control device, the eyepiece optical device forms an image from the transfer optical device on a retina of an observer, the transfer-optical-device control device controls the transfer optical device such that the image incident from the image forming device reaches the eyepiece optical device under the control of the control unit on the basis of position information of the eyepiece optical device detected by the first position detection device, and the control unit corrects a position detected by the first position detection device on the basis of position information of the eyepiece optical device detected by the second position detection device.

The present invention relates to a reflective eyepiece optical system and a head-mounted near-to-eye display device. The system includes: a first optical element and a second optical element arranged successively along an incident direction of an optical axis of the human eye, and a first lens group located on an optical axis of an miniature image displayer. The first optical element reflects the image light refracted by the first lens group to the second optical element, and then transmits the image light reflected by the second optical element to the human eye. The effective focal lengths of the first sub-lens group, the second sub-lens group and the third sub-lens group are a combination of positive, negative and positive. The optical path is effectively folded, the overall size of the optical system is reduced, aberrations are largely eliminated, and a visual experience effect of high liveness is achieved.