Abstract: The present application generally relates to retroreflective articles and methods of making retroreflective articles. Some embodiments include a body layer having an elastic modulus of equal to or greater than 1750 MPa, a plurality of truncated cube corner elements, and a polymeric layer between the body layer and the cube corner elements, the polymeric layer having an elastic modulus of less than 1750 MPa.

Abstract: An aero-optical disturbance measurement system includes a mirror supported by a gimbal for receiving a light beam from a light emitting source, reflecting the light beam to a first periscope fold mirror and therefrom reflecting the light beam directly to a second periscope fold mirror. A first concave off-axis paraboloid mirror receives the light beam reflected from second periscope fold mirror and therefrom a first fold mirror receives the light beam reflected directly from first concave off-axis paraboloid mirror. A second fold mirror receives the light beam reflected directly from the first fold mirror. A second concave off-axis paraboloid mirror receives the light beam reflected directly from second fold mirror which reflects the light beam to a fast steering mirror. A fine tracker camera coupled to an embedded processer receives portion of light beam from fast steering mirror. Embedded processor controls movement of fast steering mirror and gimbal.

Abstract: An optical device includes: an optical portion that has a light incident face onto which light is incident; a movable portion that is swingable while supporting the optical portion; a shaft portion that supports the movable portion so as to swing the movable portion around a swing axis; and a supporting portion that supports the shaft portion. The supporting portion has a rib structure which is formed by connecting ribs. The rib structure is provided on a single surface of the supporting portion.

Abstract: According to the present invention there is provided a MEMS device comprising, a mirror which is connected to a fixed portion by means of a first and second torsional arm, each of the first and second torsional arms are configured such that they can twist about torsional axes so as to oscillate the mirror about a first oscillation axes, and wherein the first and second torsional arms are each configured to have two or more meanders and wherein the first and second torsional arms are arranged symmetrically relative to the first oscillation axis.

Abstract: A micromechanical component includes a mount; a drive body on which at least one coil device is disposed and which is connected to the mount by way of at least one spring such that the drive body can be set into a driving motion by an interaction of a current conducted through the at least one coil device and a magnetic field present at the at least one coil device; and a control element connected to the drive body such a manner that a setting of the drive body into a driving motion causes the control element to be set into a deflection motion with at least one motion component directed about a rotation axis. At least one connecting element disposes the drive body and control element relative to each other such that the rotation axis extends at a spacing from a center of gravity of the drive body.

Abstract: An optical device includes: an optical portion that has a light incident surface on which light is incident; a movable portion that supports the optical portion; a shaft portion that supports the movable portion so that the movable portion is oscillatable; and a fixing portion that is connected to the shaft portion, wherein the fixing portion has a thickness greater than the shaft portion and includes a portion of which an end not connected to the shaft portion serves as a free end.

Abstract: The present disclosure relates to the formation of high contrast, wavelength independent retroreflective sheeting made by including a light scattering material on at least a portion of the retroreflective sheeting. The light scattering material reduces the brightness of the retroreflective sheeting without substantially changing the appearance of the retroreflective sheeting when viewed under scattered light.

Abstract: Improvements and modifications are provided in the type of frustrated total internal reflection (TIR) systems described in U.S. Pat. Nos. 6,885,496; 6,891,658; 7,286,280; 7,760,417 and 8,040,591. The improvements and modifications include various methods to improve display operation of hemispherical beaded front plane TIR systems such as (a) inhibit or prevent the undesired non-uniform distribution and lateral migration of charged, electrophoretically mobile, TIR frustrating particles by encapsulating or tethering the particles to the beaded front plane surface; (b) inhibit or prevent the settling of the TIR frustrating particles such as modifying the viscosity of the low refractive index medium; and (c) inhibit or prevent the non-uniformity of the applied electric field during display operation such as using a conforming rear electrode.

Abstract: An image projection device includes: a light source for emitting a light beam; a mirror unit that includes a mirror for reflecting the beam and projects an image onto a surface by rotating the mirror about a rotational axis to scan the beam; and a controller for determining, according to a function representing a relationship between a shift amount, an emitting time of the beam, a position on the surface irradiated by the beam emitted at the emitting time, and a shift angle of the mirror from its position when it is not driven, the emitting time corresponding to a target position. The shift amount is a shift amount of a position of the beam incident on the mirror or a shift amount of a position of the source relative to an optical axis of light incident on the mirror without the shift amount and perpendicularly intersecting the rotational axis.

Abstract: Disclosed herein are devices and techniques related to optical diffusers and particularly, diffusers to reduce moiré patterns in a projected image. The device may comprise an array of micro-focal elements or reflectors and a light polarization grid. The light polarization grid configured to change a polarization between portions of a light beam and the micro-focal elements of reflectors to diffuse the light beam such that portions of the light beam having a difference in polarization may meet at a point.

Abstract: An electrostatically actuated oscillating structure includes a first stator subregion, a second stator subregion, a first rotor subregion and a second rotor subregion. Torsional elastic elements mounted to the first and second rotor subregions define an axis of rotation. A mobile element is coupled to the torsional elastic elements. The stator subregions are electrostatically coupled to respective regions of actuation on the mobile element. The stator subregions exhibit an element of structural asymmetry such that the electrostatic coupling surface between the first stator subregion and the first actuation region differs from the electrostatic coupling surface between the second stator subregion and the second actuation region.

Abstract: An optical device includes: an optical portion that has a light incident surface on which light is incident; a movable portion that includes a disposition surface on which the optical portion is disposed and a concave disposition portion; and a shaft portion that supports the movable portion so that the movable portion is oscillatable, wherein a portion in which the disposition surface is not formed is included between the optical portion and the shaft portion in a plan view in a normal line direction of the light incident surface.

Abstract: An image display apparatus includes a light output part that outputs modulated lights and a light scanning part that performs scanning with the modulated lights in first directions and second directions. Scanning with the respective modulated lights is performed only in ones of outward paths and return paths in the first directions, in an image plane, irradiated points of the modulated lights are arranged side by side in directions crossing the first directions, the scanning of the modulated lights is performed in the second directions for two scanning lines extending in the first directions at a time, and one of the irradiated points at a certain time is located in a position different from those of scanning tracks of the other.

Abstract: A mirror system including a mirror that is mounted in a manner that permits oscillation, having a coil and at least one first spring that intercouples the mirror and the coil in a way that allows the coil to be placed as a counterweight to the oscillating mirror. Also a corresponding projection device.

Abstract: The present application relates generally to retroreflective sheeting and the tools and methods used to make retroreflective sheeting. Microreplication tools and sheeting include controlled surface structure or haze. The surface structure or haze can be introduced, for example, by chemical etching of the tool surface and/or electroplating.

Abstract: A beam directing device includes a transmissive element having an entry surface disposed in a first plane and an exit surface disposed in a second plane, the first and second planes intersecting to form a wedge angle. A first coating on the entry surface transmits a predetermined spectrum of light incident upon the first coating from external to the transmissive element at a normal angle of incidence and reflects the predetermined spectrum of light incident on the first coating from within the transmissive element at two times the wedge angle. A second coating on the exit surface reflects the predetermined spectrum of light incident on the second coating from within the transmissive element at the wedge angle and transmits the predetermined spectrum of light incident on the second coating from within the transmissive element at three times the wedge angle.

Abstract: Light rays from an image A are made to enter one or more retroreflective bodies formed by first and second light-reflective surfaces 13 and 14 and third light-reflective surfaces 15, the first and second light-reflective surfaces 13 and 14 each being orthogonal to one another and formed in a right-triangle-wave pattern in cross section, the third light-reflective surfaces 15 being orthogonal to each of corresponding ones of the first and second light-reflective surfaces 13 and 14, a direction of each of one or more reflected lights from the one or more retroreflective bodies is further turned in a different direction on a corresponding one of fourth light-reflective surfaces 16, and an image B is formed at a different position.

Abstract: The present disclosure provides a retroreflective film for removable application to a three-dimensional object. The film comprises a transparent film layer; a first transparent adhesive layer; a retroreflective layer comprising glass microspheres and a binder; a metalized coating layer comprising aluminum applied on the retroreflective layer; a removable adhesive layer having a peel force of 2 lbs/inch or less. When the film is elongated by 50% it retains at least 50% of its unstretched coefficient of retroreflection as measured at the 0.2 degree observation angle and ?4 degree entrance angle. When the film is elongated by 50% it retains at least 50% of its unstretched gloss when measured at a 20 degree angle.

Abstract: A display device includes: a stepping motor; a concave mirror that moves in accordance with the operation of the stepping motor, the concave mirror reflecting display light emitted from a display unit toward the windshield; a lever part that moves together with the concave mirror; a drive unit for driving the stepping motor by a microstep drive system; a control unit for controlling the movement of the concave mirror by controlling the drive unit; and a stopper unit provided within the range of movement of the lever part. The drive unit is configured to detect the counter-electromotive force generated by the stepping motor when the lever part comes into contact with the stopper unit. The control unit determines the reference position when the movement of the concave mirror is controlled in accordance with the counter-electromotive force detected by the drive unit.

Abstract: A display device includes a display and a prism module. The display has a display area and a frame area surrounding the display area. The display area has a plurality of corners. The prism module includes a first prism and a second prism. The first prism is located on an edge area of the display area. The first prism includes a plurality of first corner portions. Each first corner portion is correspondingly arranged in a corner of the display area. Each first corner portion has a first free-form curved surface. The second prism is located on the frame area and is conformally disposed beside the first prism. The second prism includes a plurality of second corner portions. Each second corner portion has a second free-form curved surface. The second free-form curved surface faces the first free-form curved surface. A prism module is also provided.