Abstract: A virtual reality lens barrel assembly, a virtual reality device and a control method, belonging to the field of virtual reality technology is provided. The virtual reality lens barrel assembly includes a lens, a blocking mechanism and a lens barrel, the lens and the blocking mechanism are both located outside a first opening of the lens barrel, and a second opening of the lens barrel is configured to place a display assembly; and the blocking mechanism includes a through hole with a variable size, and an optical axis of the lens passes through a center of the through hole and the first opening.

Abstract: An energy conserving remote viewing system comprising an instantaneous analog video transmission camera, an analog video receiver that receives and transmits a video image to a video monitor and a remote transmitter that activates the analog video transmission camera. The remote camera device is normally in a low power, sleep mode that has a minimal power drain. The system includes a battery powered camera requiring a first voltage to operate and an RF transmitter to send an activation signal to the camera. The activation signal has a duration. A camera power circuit includes a normally sleeping signal receiving circuit and a first timer. The first timer periodically activates the signal receiving circuit to check for the presence of the activation signal and turns off the signal receiving circuit if the activation signal is not present and turns on the camera if the activation signal is present, and wherein the time the signal receiving circuit sleeps is less than the activation signal duration.

Abstract: An optical system having an input surface configured to receive an input optical signal having a polarization, and a polarization changer comprising the input surface and configured to generate two orthogonal polarization components from the input optical signal. The polarization changer also changes a direction of the polarization of the input optical signal in a controlled manner while maintaining coherence of the two orthogonal polarization components in order to reduce stimulated Brillion scattering.

Abstract: A digital single-lens reflex camera includes a first mirror for reflecting part of a light beam coming from a subject through a photographing optical system and transmitting the remaining light beam. The reflected light beam is used for detecting the focus state of an imaging light beam, and the transmitted light beam is used for performing live view display. For example, the first mirror can be configured as a movable mirror in the digital single-lens reflex camera. This enables continuous live view display using the transmitted light beam on condition that the movable mirror is down while detecting the focus state using the reflected light beam. In addition, phase-contrast AF can be adopted for detecting the focus state.

Abstract: Described is a wide-angle slip-on viewfinder (1) on rangefinder cameras for analog and digital wide-angle recordings of different image recording formats with lenses of different focal lengths, comprising three lens groups (LG1, LG2, LG3), a frame/mask unit (10) and a partially transmissive prism cube (8) which is designed as a combination element, wherein, on the light entrance side (4) in the viewfinder beam path (9), a first lens group (LG1) has a negative refractive power and the second and third lens groups (LG2, LG3) have a positive refractive power, wherein the second lens group (LG2) is composed of a first lens (L3) arranged downstream of the first lens group (LG1) and a second lens (L4) arranged on the light exit side (7) and the partially transmissive prism cube (8) is arranged between the lenses (L3, L4) and the third lens group (LG3) is arranged in a mask imaging beam path (11) which is at right angles to the viewfinder beam path (9) between the frame/mask unit (10) and the partially transmissive

Abstract: A superimpose-plate is put on a focusing glass, on which a subject image obtained through the photographing optical system is formed. The superimpose-plate and the focusing glass are provided in an incident opening of a hollow pentagonal mirror. The superimpose-plate comprises a plurality of micro-prisms that are formed on the superimpose-plate. Each of the micro-prisms shows a triangle in a cross-section. The vertical angle of the triangle is identical in each of the micro-prisms. A ridgeline of each of the micro-prisms is parallel to the right-left direction of the picture plane of the view finder.

Abstract: A light-projecting device comprises an ocular optical system facing an emergent opening of a hollow pentagonal mirror. A superimpose-plate is provided in an incident opening of the hollow pentagonal mirror so that a subject image obtained through a photographing optical system is formed. The superimpose-plate is put on a focusing glass. A mark, indicated in a picture plane of the view finder, is formed on the superimpose-plate. A light source radiates an illumination light beam. A light-projecting prism reflects the illumination light beam toward the emergent opening. The light-projecting prism has a light-projecting plane. The light-projecting plane is located below the optical axis of the ocular optical system.

Abstract: A focusing screen for use in a camera has a diffusive surface having a plurality of random pattern cells of one or a plurality of types arranged two-dimensionally so as to form a macroscopically flat surface. The random pattern cells are each composed of a plurality of minute rectangular elements having one of two to eight types of heights, and the individual rectangular elements are arranged irregularly so as to constitute a plurality of types of diffraction gratings having different grating pitches.

Abstract: A finder system for a single lens reflex camera includes a focusing screen having a split prism, a penta roof mirror and an eyepiece lens system. The penta roof mirror has a hollow housing made of plastic material in the shape of a pentagonal prism whose three surfaces are coated inside to reflect light. The eyepiece lens system includes two plastic lenses, each of which has a different dispersion.

Abstract: A viewfinder of a camera having a multi-point type auto-focus function, in which a photographing lens can be focused on one of a plurality of objects in a plurality of focus detection zones within the field of view, when viewed through a viewfinder, includes a focusing plate which is provided with a plurality of split-image prisms corresponding to the focus detection zones within the finder field of view.

Abstract: A device and a method for facilitating the focusing of a camera during a so-called tilt operation, in which an image plane/focusing plane of a camera is angled relative the optical axis of an objective lens or vice versa, in order to obtain an inclined plane of focus, the camera being provided with a focusing screen located in said image plane/focusing plane and an optical viewing location, the optical axis which coincides with the optical axis of said focusing screen, said tilt operation resulting in the exiting light from the focusing screen being directed away from said viewing location, wherein an optical wedge is located between said focusing screen and said viewing location in such a way as to redirect the exiting light to said viewing location at which an eyepiece or an observer's eye is located. In a preferred embodiment, said optical wedge is a fresnel prism plate located adjacent to said focusing screen on the side of the exiting light.

Abstract: Apparatus comprising active alignment sensors mounted on the steerable wheel of a vehicle to follow the plane of rotation of these wheels, cooperating passive alignment means positionable selectively on the non-steerable wheels and on the adjacent vehicle body in view of the active sensors, and associated electronic equipment assembled in a console and responsive to signals generated by the active sensors for displaying alignment characteristics important to achieve motion balance in the vehicle for proper rolling response of the wheels and directional attitude of the vehicle body with steering wheel center-point position.