An image projector includes a spatial light modulator (SLM) with a two dimensional array of pixel elements controllable to modulate a property of light transmitted or reflected by the pixel elements. An illumination arrangement delivers illumination to the SLM. A collimating arrangement collimates illumination from the SLM to generate a collimated image directed to an exit stop. The illumination arrangement is configured to sequentially illuminate regions of the SLM, each corresponding to a multiple pixel elements. A controller synchronously controls the pixel elements and the illumination arrangement so as to project a collimated image with pixel intensities corresponding to a digital image.

A line scanner assembly includes a cam with a cam surface, where the cam rotatable about a cam axis of rotation and includes a first ferromagnetic material. A mirror with a planar surface is configured to tilt about a mirror axis of rotation. A follower is attached to the mirror and has a second ferromagnetic material, where the first magnetic material and/or the second magnetic material includes a permanent magnet and where the follower maintains contact with the cam due to a magnetic attraction between the first ferromagnetic material and the second ferromagnetic material.

A wearable heads-up display includes a power source, laser sources, and a lightguide. A photodetector is positioned to detect an intensity of a test light emitted at a perimeter of the lightguide from an optical path within the lightguide. A laser safety circuit provides a control to reduce or shut off a supply of electrical power from the power source to the laser sources in response to an output signal from the photodetector indicating that the detected intensity is below a threshold.

Provided is an optical device capable of suppressing variations in the range for scanning light. This optical device comprises: a light source that emits a laser beam; a MEMS mirror that scans the laser beam toward a predetermined range; and a diffraction grating that guides the laser beam to the MEMS mirror by guiding the laser beam in a direction corresponding to the wavelength thereof. The optical device also comprises an MEMS control unit that performs control such that, by employing a change in the optical path of the laser beam caused through the diffraction grating by a change in the wavelength of the laser beam, variations in the scanning range of the laser beam by the MEMS mirror are suppressed.

An actuator that includes: a first driving body that includes a first piezoelectric material that extends in a first axis direction; a second driving body that includes a second piezoelectric material shorter than the first piezoelectric material in the first axis direction; and a base that holds the first driving body and the second driving body at proximal end portions of the first driving body and the second driving body in the first axis direction. The first driving body and the second driving body are aligned and coupled together in a polarization axis direction in a state in which a polarization axis of the first piezoelectric material and a polarization axis of the second piezoelectric material correspond with each other. A length of the second piezoelectric material in a second axis direction is greater than a length of the first piezoelectric material in the second axis direction.

A light projection system includes a MEMS mirror operating on a mirror drive signal to generate a mirror sense signal resulting from operation of the MEMS mirror based on the mirror drive signal. A mirror driver generates the mirror drive signal from a drive control signal. A controller receives the mirror sense signal from the MEMS mirror, obtains a first sample of the mirror sense signal at a first phase thereof, obtains a second sample of the mirror sense signal at a second phase thereof, wherein the first and second phases are separated by a half period of the mirror drive signal, with the second phase occurring after the first phase, and generates the drive control signal based on a difference between the first and second samples to keep the mirror drive signal separated in phase from the mirror sense signal by a desired amount of phase separation.

Display systems, such as near eye display systems or wearable heads up displays, may include a laser projection system having an optical engine and an optical scanner. Light output by the optical engine may be directed into the optical scanner as two angularly separated laser light beams. The angularly separated laser light beams typically have different angles of incidence on a second scan mirror of the optical scanner. Respectively different levels of magnification are applied to the beam diameter of each of the angularly separated laser light beams in a first dimension, such that the angularly separated laser light beams have respectively different beam diameters upon incidence at the second scan mirror. In some embodiments, the different beam diameters of the angularly separated laser light beams result in regions of incidence of each of the angularly separated laser light beams on the second scan mirror being equal or substantially similar.

A drive device (10) includes a support (23), a first movable portion (21), a first magnet (41), a second magnet (42), a first coil (31), and a second coil (32). The first movable portion (21) is swingable in two axial directions with respect to the support (23). The first magnet (41) is positioned inside the first movable portion (21) when viewed from a first direction. The second magnet (42) is positioned outside the first movable portion (21) when viewed from the first direction. Magnetic flux from the first magnet (41) acts on the first coil (31). Magnetic flux from the second magnet (42) acts on the second coil (32).

A MEMS-mirror device (1) is provided that comprises a support (2), a mirror body (3) that is rotationally suspended with respect to the support along a rotation axis (4), and an actuator (7A, 7B) to induce a rotation in the mirror body around the rotation axis. The mirror body (3) has a mirror surface (311) that in a neutral state defines a reference plane (x, y) having a longitudinal axis (y) through a center of the mirror body parallel to the rotation axis (4) and a lateral axis (x) transverse to the longitudinal axis. The mirror body (3) has a central portion (31) and integral therewith a pair of extension portions (32A, 32B) that extend in mutually opposite directions along the longitudinal axis. Each of the extension portions (32A, 32B) is flexibly coupled at a lateral side (322A, 322B) to the support with a respective plurality (6A, 6B) of torsion beams (61) which in a neutral state of the mirror body extend in the reference plane (x, y). The torsion beams of a respective plurality of torsion beams have a respective first end (611) attached to the support and a respective second end (612) attached to the respective extension portion, wherein the respective first end and the respective second end have mutually different positions (y1, y2) in the direction of the longitudinal axis (y) and in the lateral direction (x) are at mutually opposite sides (x1, x2) of the rotation axis (4).

A resonance mode of one lower order than a basic resonance mode closest to a frequency of a cyclic voltage signal exists in at least any one of a plurality of resonance modes accompanied by a mirror tilt swing around a first axis or a plurality of resonance modes accompanied by the mirror tilt swing around a second axis. In a case where a resonance frequency of one higher order from a frequency of the basic resonance mode is f.sub.rH, a ratio of a first voltage level to a second voltage level which is a maximum voltage level value in the entire frequency range among frequency components of the cyclic voltage signal is satisfied to be −55 dBV or less, where a maximum voltage level value in a frequency range of (1±1/20)×f.sub.rL and a frequency range of (1± 1/20)×f.sub.rH among the frequency components of the cyclic voltage signal is the first voltage level for an axis in which the lower-order resonance mode exists among the first axis and the second axis, and a maximum voltage level value in the frequency range of (1± 1/20)×C.sub.rH among the frequency components of the cyclic voltage signal is the first voltage level for an axis in which the lower-order resonance mode does not exist among the axes.