This invention provides a lens assembly for a vision system, allowing for a constant magnification at various focal distances. The lens assembly resides movably/adjustably along the optical axis relative to the sensor. In an embodiment, the lens assembly includes a fixed rear lens and a front lens that is moved mechanically to focus the object image on the image sensor. The lens assembly can alternatively include a liquid lens that is controlled to adjust magnification with respect to a fixed front lens so as to maintain a constant system magnification. The liquid lens resides between the (fixed) front lens assembly and the image sensor and can be controlled to focus the image onto the image sensor.

An objective optical system (OB) which forms an observation optical system (LS) consists of, in order from the object, a first lens group (G1) that has positive refractive power, a second lens group (G2) that has positive or negative refractive power, and a third lens group (G3) that has negative refractive power. Focusing is performed by moving the second lens group (G2) along an optical axis, the third lens group (G3) is configured to move in a direction that is perpendicular to the optical axis to correct image blur, and the following conditional expression is satisfied:

0.70≤f1/f12≤1.50 where f1 denotes a focal length of the first lens group (G1), and f12 denotes a combined focal length of the first lens group (G1) and the second lens group (G2).

An objective optical system (OB) which forms an observation optical system (LS) consists of, in order from the object, a first lens group (G1) that has positive refractive power, a second lens group (G2) that has positive or negative refractive power, and a third lens group (G3) that has negative refractive power. Focusing is performed by moving the second lens group (G2) along an optical axis, the third lens group (G3) is configured to move in a direction that is perpendicular to the optical axis to correct image blur, and the following conditional expression is satisfied:

0.70≤f1/f12≤1.50 where f1 denotes a focal length of the first lens group (G1), and f12 denotes a combined focal length of the first lens group (G1) and the second lens group (G2).

A transparent thin film electroluminescent display device includes a first transparent thin film electroluminescent display having a substrate and a first active layer capable of emitting a spectrum of light in a wavelength of visible light. The transparent thin film electroluminescent display device further includes a second transparent thin film electroluminescent display having a substrate and a second active layer, the first and second transparent thin film electroluminescent displays being arranged in a superposed manner such that the first and second active layers are spaced apart from each other for forming the transparent thin film electroluminescent display device with a superposed structure.

The invention relates to optical surveying such as in building construction, road construction, landscaping and similar. A first image sensor obtains in a first wavelength range a first image of a scene within a field of view captured by an optical arrangement such as a telescope. A light emitter emits light in a second wavelength range and a second image sensor obtains a second image of the field of view in the second wavelength range. A target position of a reflecting target is found in the first image by detecting a known image pattern of the reflecting target in the first image. A region of interest in the second image is then a defined based on the identified target position in the first image, for detecting a reflector position of a reflector of the reflecting target in the region of interest. With the invention it becomes possible to improve the identification of a reflective target at reduced processing time, even if reflections from other objects than the reflective target are present.

The present invention relates to target acquisition and related devices, and more particularly to telescopic gunsights and associated equipment used to achieve shooting accuracy at, for example, close ranges, medium ranges and long ranges at stationary and moving targets.

A forming mold for forming a prism by press molding includes a first mold, a second mold, and a third mold. The second mold includes a surface configured to form a base surface of a non-optical surface and is configured to define, together with the first mold, a space in which a material is disposed. The third mold is slidable with respect to the second mold so as to project toward the space with respect to the second mold and is configured to form a recess portion recessed with respect to the base surface.

An unobscured five-mirror afocal telescope includes an aperture configured to direct electromagnetic radiation to first, second, third, fourth and fifth mirrors, each configured to receive electromagnetic radiation and reflect electromagnetic radiation along a beam path. The five mirrors are arranged to sequentially reflect from one another electromagnetic radiation received via the aperture to produce a collimated output beam of the electromagnetic radiation at an exit pupil, with the five mirrors consisting of a three-element objective and a two-element eyepiece. A beam splitter may be disposed between the first mirror and the second mirror to direct short-wavelength electromagnetic radiation toward a device along a separate path.

An occulting device includes a sensor capable of capturing an image, a photochromic film disposed in a field of view of the sensor, and a projector disposed adjacent the photochromic film and capable of darkening portions of the film.

An occulting device includes a sensor capable of capturing an image, a photochromic film disposed in a field of view of the sensor, and a projector disposed adjacent the photochromic film and capable of darkening portions of the film.