摘要:
An electrostatic actuator for increasing a swing (deflection angle) of a movable structure includes a laminate substrate in which a thin film silicon layer is formed on a silicon substrate through a buried insulating film and a torsion beam movable structure constructed with the thin film silicon layer. A potential difference is generated between a movable side comb-tooth electrode of the movable structure and a fixed side comb-tooth electrode disposed to face the movable side comb-tooth electrode to swing the movable structure. The fixed side comb-tooth electrode is formed in the inside of a through hole bored through the laminate substrate.
摘要:
An electrostatic actuator for increasing a swing (deflection angle) of a movable structure includes a laminate substrate in which a thin film silicon layer is formed on a silicon substrate through a buried insulating film and a torsion beam movable structure constructed with the thin film silicon layer. A potential difference is generated between a movable side comb-tooth electrode of the movable structure and a fixed side comb-tooth electrode disposed to face the movable side comb-tooth electrode to swing the movable structure. The fixed side comb-tooth electrode is formed in the inside of a through hole bored through the laminate substrate.
摘要:
An optical scanner and a two-dimensional scanning device using the same are provided. The optical scanner includes a scanning mechanism and a swing support. The swing support is designed to support the scanning mechanism on a housing so as to allow the scanning mechanism to swing and made up of a plurality of springs. The springs are so constructed so as resist unwanted vibrations acting on the optical scanner in directions different from a scan direction, thereby ensuring a stable scan of a light beam at all the time.
摘要:
A two-dimensional optical scanner not affected by acceleration disturbances. The two-dimensional optical scanner includes a mirror section having at least one mirror surface formed thereon. A first frame is provided outside the mirror section with a first clearance therebetween. First springs connect the mirror section and the first frame and torsionally vibrating about an axis passing through the center of gravity of the mirror section. A second frame is provided outside the first frame with a second clearance therebetween, and second springs connect the first frame and the second frame. The second springs torsionally vibrate about an axis passing through the center of gravity of mirror section. Piezoelectric bimorphs 21, 22, 23, and 24 drive the optical scanner to impart a torsional oscillation to the first springs and the second springs.
摘要:
An optical data reader including a device for producing a light beam, and a device for changing a condensing position of the light beams before the light beam is reflected from a target such as a bar code. The device for changing the condensing position is either a variable focus lens or mirror, each adapted to change the curvature of the surface of the lens or mirror in order to move the condensing position cyclically and continuously. The variable focus mirror changes the shape of its reflecting surface in response to electrical signals from a driving circuit. Excess pressure within the mirror caused by the mirror surface being attracted inwards is expelled through intake/outlet ports formed in the drive electrode. The variable focus lens alters the focal length of the lens each time the curvature of the surface thereof is changed. Preferably, the curvature of the lens surface is changed by increasing fluid pressure within the lens, while the curvature of the variable focus mirror is electrically driven. Either the variable focus lens or mirror is disposed in the optical path between the light source and the target. The light source is usually a laser or laser diode.