A focusing mechanism for a binocular with dual stiffness of operation, comprises a focusing knob which is mounted rotatably about its longitudinal axis on a static shaft which is fixedly mounted in the binocular structure. The focusing knob is associated with a braking means with adjustable braking effect and is provided with a braking drum. The cylindrical circumferential surface of the braking drum is associated rotatably about its longitudinal axis with the cylindrical circumferential surface of a braking ring, whose other cylindrical circumferential surface is associated by its circumferential surface with a collet of a clamping ring, which is with its rigid part seated in the housing which is fixedly mounted on the static shaft. The collet of the clamping ring is associated with the control of the pressure force on the cylindrical circumferential surface of the braking ring, the control of the gripping of the collet being coupled to a switch of stiffness of the focusing operation.

Provided are a lens drive device, a camera module, and a camera-equipped device. A set consisting of an image-stabilization coil part and an image-stabilization magnet part in the lens drive device is disposed along a first side and a second side that are adjacent to each other. An autofocus movable part is disposed eccentrically with respect to a central axis along the direction of the optical axis. An image-stabilization fixed part includes connection terminal parts that are respectively disposed on the first side and the second side, and are connected to power supply wiring of the image-stabilization coil part.

A stereoscopic optical system including: left and right channels; an electromagnetic actuator including a stator and rotor; wherein first optical components of the left channel are arranged in a left tube and second optical components of the right channel are arranged in a right tube; the stator is arranged outside the guide tubes; the rotor includes a left rotor, in which one or more of the first optical components is accommodated, and a right rotor, in which one or more of the second optical components is accommodated; the left and right rotors are mounted in one of the left and right tubes to be movable in a longitudinal axial direction; the left and right rotors include paramagnetic and/or ferromagnetic material and are movable by an electromagnetic field; the stator includes distal and proximal permanent magnets oppositely polarized; and the stator includes an electric coil for generating the electromagnet field.

The present invention is a lightweight night vision device sealed from environmental conditions, shielded from electromagnetic interference (EMI), and having mechanisms for easy adjustment and fixation of collimation and interpupillary distance. The night vision device accomplishes this by removing unnecessary elements from existing designs and providing new components to provide full adjustability while maintaining EMI shielding. Certain components from existing night vision devices may be reused in assembling the present invention to provide cost savings.

The invention relates to a binocular observation device, in particular a field glass, with two visual optical paths and with a laser distance meter with a laser transmitter and a laser receiver and with an opto-electronic display element. A part of an optical path of the laser transmitter is integrated in a first visual optical path and a part of an optical path of the laser receiver is also integrated in the first visual optical path.

The invention relates to a binocular observation device, in particular a field glass, with two visual optical paths and with a laser distance meter with a laser transmitter and a laser receiver and with an opto-electronic display element. A part of an optical path of the laser transmitter is integrated in a first visual optical path and a part of an optical path of the laser receiver is also integrated in the first visual optical path.

A retractable virtual reality device includes a rear cover, a front cover, a first restraining component, a second restraining component, and a display module. The front cover is movably combined with the rear cover. The first restraining component is fixed on the front cover. The second restraining component is movably disposed on the rear cover and for restraining the first restraining component. The display module includes a sleeve, a lens, and a display. The sleeve is fixed on the rear cover. The lens is disposed on a side of the sleeve. The display is disposed on the front cover and movably combined with the other side of the sleeve. By cooperation of the first restraining component and the second restraining component, the display and the front cover are movable relative to the lens and the rear cover, which reduces an overall size of the virtual reality device for easy carry.

A retractable virtual reality device includes a rear cover, a front cover, a first restraining component, a second restraining component, and a display module. The front cover is movably combined with the rear cover. The first restraining component is fixed on the front cover. The second restraining component is movably disposed on the rear cover and for restraining the first restraining component. The display module includes a sleeve, a lens, and a display. The sleeve is fixed on the rear cover. The lens is disposed on a side of the sleeve. The display is disposed on the front cover and movably combined with the other side of the sleeve. By cooperation of the first restraining component and the second restraining component, the display and the front cover are movable relative to the lens and the rear cover, which reduces an overall size of the virtual reality device for easy carry.

A method includes displaying a high contrast image on a display screen; and projecting the high contrast image through a Fresnel lens to provide a cue for adjusting a position of the Fresnel lens. Also disclosed is a device for determining and/or adjusting an offset of a Fresnel lens. The device includes a Fresnel lens and a display screen configured to project a high contrast image through the Fresnel lens. Further disclosed is a method for adjusting a position of a Fresnel lens. The method includes receiving a projection of a high contrast image transmitted through a Fresnel lens; and adjusting a position of the Fresnel lens based on the projection of the high contrast image.

A method includes displaying a high contrast image on a display screen; and projecting the high contrast image through a Fresnel lens to provide a cue for adjusting a position of the Fresnel lens. Also disclosed is a device for determining and/or adjusting an offset of a Fresnel lens. The device includes a Fresnel lens and a display screen configured to project a high contrast image through the Fresnel lens. Further disclosed is a method for adjusting a position of a Fresnel lens. The method includes receiving a projection of a high contrast image transmitted through a Fresnel lens; and adjusting a position of the Fresnel lens based on the projection of the high contrast image.