Abstract: This vibrating element includes a movable portion driven to vibrate at a prescribed resonance frequency, a driving portion vibrating the movable portion by cyclically supplying a pulse signal and a detecting portion detecting the vibrational state of the movable portion, while the driving portion is so formed as to supply the pulse signal at a first frequency substantially identical to the resonance frequency of the movable portion at least in starting and to cyclically supply the pulse signal at a second frequency smaller than the first frequency in detection of the vibrational state of the movable portion.

Abstract: Disclosed is a projection image display apparatus to display an image by projecting a light from a light source to a screen including a scan mirror to scan the light from the light source by vibrating in a sine vibration manner at least in an one-dimensional direction and a correction lens which is disposed between the scan mirror and the screen and which corrects a deflection angle of the light scanned by the scan mirror at least in the one-dimensional direction, and the correction lens carries out a correction so that the larger a scan angle of the scan mirror is, the larger the deflection angle is to be by the correction.

Abstract: An enlarging optical unit receives laser light emitted from a laser light source, enlarges a light flux of the received laser light to have a diverging angle corresponding to a swing angle of a scanning mirror and provides it to the scanning mirror.

Abstract: A laser projector includes a green laser, a two-wavelength laser, a PBS, a collimator lens, a two-axis galvanometer mirror, a group of lenses, and a screen. The green laser emits a green laser beam. The two-wavelength laser emits red and blue laser beams. The PBS is provided at the position where respective optical paths of laser beams emitted from respective lasers cross each other to cause these optical paths to coincide with each other.

Abstract: A projector includes: a laser beam generator configured to emit a laser beam according to an image signal; a beam splitter configured to split the laser beam into a first laser beam toward the first projection plane and a second laser beam toward the second projection plane; a scanning unit, disposed between the laser beam generator and the beam splitter, configured to scan the laser beam from the laser beam generator toward the beam splitter; a light receiver configured to receive reflected light of the first laser beam; a computation portion configured to compute positional information indicating a position of an obstacle located in an optical path of the first laser beam based on a light receiving result by the light receiver; and a display control portion configured to change the image signal so that a pointer is displayed in the image based on the positional information.

Abstract: A projector that can prevent laser light from entering eyes is provided. A process that controls the projector includes the steps of detecting turning-on of power to the projector; detecting an input for adjusting the reflection direction of a two-axis galvanometer mirror; sending an instruction to reduce output from respective lasers, to an FPGA; setting signal values of the lasers respectively controlled by laser control circuits, to small values; determining whether a certain period of time has elapsed since an operation input is no longer performed on an operation panel; standing by the process for a certain period of time when the certain period of time has not elapsed since an operation input is no longer performed; and returning the signal values to a normal level when the certain period of time has elapsed since an operation input is no longer performed.

Abstract: An image display apparatus is provided that allows a user to check image content even in a place where there is no projection screen. A projector that is one mode of the image display apparatus includes a casing, a projection aperture provided in the casing, and an internal projection mirror and a built-in screen that are provided in a casing. When the projector is being folded, laser light emitted from the projection aperture is reflected by the internal projection mirror. The reflected light is projected onto the built-in screen, whereby an image is displayed.

Abstract: Conventional mirror angle control systems require a detection mirror separate from a deflection mirror. Depending on the accuracy with which these mirrors are fitted relative to each other, in products incorporating such control systems, degraded control accuracy may result. Moreover, a separate light source is needed for shining laser light on the detection mirror. This makes it difficult to miniaturize products incorporating these control systems, and leads to increased electric power consumption. To overcome these disadvantages, in the mirror angle control system of the invention, light from a light source is shone on a mirror, and part of the light reflected therefrom is condensed, with a reflective hologram, on a light receiver. Then, based on an electrical signal commensurate with the inclination angle of the mirror as outputted from the light receiver and a target signal, a drive signal is fed to a driver that drives the mirror to rotate.

Abstract: An optical pickup device includes three laser light sources, one objective lens, and a beam shaping mirror. The beam shaping mirror converts light intensity distribution of the laser beams having the respective wavelengths from an elliptic shape to a circular shape by inputting the respective laser beams from a transmission surface, reflecting the laser beams by a reflection surface that is not parallel to the transmission surface and outputting the laser beams from the transmission surface. Two kinds of diffraction gratings are formed on the reflection surface and the plurality of diffraction gratings are formed alternately and side by side. The two kinds of diffraction gratings diffract the laser beams having two out of the three wavelengths such that dispersion by the refracting action at the transmission surface is canceled out using the dispersion by the diffracting action at the reflection surface.

Abstract: An optical pickup device includes two laser light sources, one objective lens, and a beam shaping mirror. The mirror converts light intensity distribution of the laser beams having the respective wavelengths from an elliptic shape to a circular shape by inputting the respective laser beams from a transmission surface, reflecting the laser beams by a reflection surface that is not parallel to the transmission surface and outputting the laser beams from the transmission surface. Diffraction gratings which are different types each other are formed respectively on the transmission surface and the reflection surface. The diffraction gratings which are formed respectively on the transmission surface and the reflection surface diffract at least the laser beam having one wavelength of the two wavelengths such that dispersion by the refracting action at the transmission surface is canceled out using the dispersion by the diffracting action at the transmission surface and the reflection surface.

Abstract: An optical pickup apparatus includes a plurality of laser light sources, a single objective lens, and a beam shaping mirror. The beam shaping mirror causes each of the laser beams to be incident on a transmission surface, reflects the beam from a reflection surface being unparallel to the transmission surface and causes the beam to emerge from the transmission surface, thereby to convert a light intensity distribution of the beam of each of the wavelengths from an elliptic shape into a circular shape. The beam shaping mirror is made of a liquid crystal, which forms the transmission surface and the reflection surface, and is electrically driven so that a refractive index of the liquid crystal may be held constant irrespective of the wavelengths of the beams each of which enters the beam shaping mirror.

Abstract: In an optical pickup device which is compatible with two light beam having two wavelengths, a beam shaping mirror is arranged which has an incident surface and a reflecting surface that are disposed in non parallel relation, and makes light intensity distribution of the light beam emitted from a light source that has the light intensity distribution in a shape of ellipse, close to a circular shape by reflecting the light beam coming into the incident surface by the reflecting surface. A diffraction grating is formed on the reflecting surface of the beam shaping mirror, at least one of the two light beams having different wavelengths emitted from the light source is diffracted by the diffraction grating, and directions of optical axes of the two light beams which are output from the beam shaping mirror are made substantially the same.

Abstract: Conventional mirror angle control systems require a detection mirror separate from a deflection mirror. Depending on the accuracy with which these mirrors are fitted relative to each other, in products incorporating such control systems, degraded control accuracy may result. Moreover, a separate light source is needed for shining laser light on the detection mirror. This makes it difficult to miniaturize products incorporating these control systems, and leads to increased electric power consumption. To overcome these disadvantages, in the mirror angle control system of the invention, light from a light source is shone on a mirror, and part of the light reflected therefrom is condensed, with a reflective hologram, on a light receiver. Then, based on an electrical signal commensurate with the inclination angle of the mirror as outputted from the light receiver and a target signal, a drive signal is fed to a driver that drives the mirror to rotate.

Abstract: An optical fiber connector comprises a first tubular body having a passageway extending generally longitudinally therethrough for receiving an optical fiber, a first end for connection to an adaptor and being polished into a tilted convex surface, and a second end. A second tubular body has a passageway extending generally longitudinally therethrough in substantial coaxial alignment with the passageway of the first tubular body for receiving the second end of the first tubular body. A positioning device integral with the second tubular body is provided for positioning a tilt direction of the tilted convex surface of the first tubular body in a predetermined registered position when the first end of the first tubular body is connected to the adaptor.