56 results about "Oblique reflection" patented technology

The invention proposes a narrow-linewidth and high-performance tunable optical detector based on a non-periodic sub-wavelength grating, and relates to the technical field of photoelectron. The high-performance optical detector comprises a filtering cavity bottom lens (DBR), a filtering cavity, a filtering cavity top lens (DBR), an absorption cavity and a non-periodic sub-wavelength grating oblique reflection mirror from bottom to top. In the optical detector, the optical cavity length is changed by electric tuning or thermal tuning to achieve a selective tuning function of wavelength; and the non-periodic sub-wavelength grating inclined reflection mirror is used for achieving oblique reflection on incident light at different angles for many times, so that the incident light can be repeatedly absorbed by an absorption layer, and the high-speed and high-quantum efficiency performance of a device is achieved. The optical detector has the characteristics of narrow linewidth, high quantum efficiency, high frequency response bandwidth and the like, is easy to integrate and is tunable, and can be widely applied to the field of optical communication and optical signal processing.

A backlight unit of a liquid crystal display device includes a light source and a reflective means, the reflective means having a plurality of sloping reflective surfaces for reflecting light emitted from the light source to a light-irradiation surface of a liquid crystal panel at an angle of about 30° or less with respect to a line perpendicular with the light-irradiation surface of the liquid crystal panel thereby to improve light efficiency.

A MEMS mirror is disclosed having thickness correlated with the intensity profile of an impinging optical beam, so as to reduce moment of inertia of the MEMS mirror while preserving optical quality of the reflected beam. It is the mirror edges that contribute the most to the moment of inertia, while it is generally the mirror center that contributes the most to a reduction of the quality of an optical beam reflected from the mirror. Accordingly, by providing a mirror having laterally varying thickness matched to the local variation of the intensity of the optical beam, the quality of the latter may be preserved while the moment of inertia of the mirror may be significantly reduced. The thickness of MEMS mirrors may be varied continuously or stepwise; in one direction or in two mutually orthogonal directions.

The present invention relates, in general, to a light modulator having a variable blaze diffraction grating and, more particularly, to a light modulator having a variable blaze diffraction grating, in which a diffraction member rotates due to piezoelectric force so as to incline a reflective surface.

A projection display system includes a screen, an illumination projecting system to form an image using light radiated by a light source, to magnify the image, and to project the image along a rear side of the screen, and a reflection unit having an array of unit mirrors to reflect the image received from the illumination projecting system onto the screen, each of the unit mirrors having a first sloped reflection surface and a second reflection surface adjacent to the first reflection surface having a predetermined angle therebetween.

The invention relates to a three-dimensional rotating angle measurement method and device adopted by the same. The three-dimensional rotating angle measurement device comprises a measurement device composed of two two-dimensional auto-collimators and a reflection part which is a cooperative target. During measurement, the first auto-collimator in the measurement device collimates the forward reflection face of the reflection part and measures the two-dimensional angle change amount of the forward reflection face of the reflection part according to an optical auto-collimation measurement principle. In the similar way, the second auto-collimator measures the two-dimensional angle change amount of the oblique reflection face of the reflection part. A data processing center of the three-dimensional measurement device can calculate three-dimensional rotating angle values according to a formula after receiving angle information, achieves the three-dimensional posture change amount of a measured object in space and has the advantages of being simple in achievement mode, mature and reliable in technology and convenient to install and operate.

A backlight illuminating module includes a first supporting base, a plurality of first illuminating units, and a light reflection housing. The light reflection housing includes a first light reflection member having a first inclined reflection surface, a first vertical optical surface and a plurality of first prisms provided in a first light reflection chamber, wherein when the first illuminating units are activated to generate illumination, the illumination is arranged to be reflected and diffracted by the first inclined reflection surface, the first vertical optical surface and the first prisms to produce an uniform line source of light of the backlight illuminating module.

The present invention relates to the field of semiconductor photoelectronic device, and provides a resonant cavity based on a non-periodic sub-wavelength grating and a distributed bragg reflector (DBR). The resonant cavity based on a non-periodic sub-wavelength grating and a DBR has a feature of controlling distribution of a light standing wave field in the resonant cavity. The structure of the resonant cavity comprises from top to bottom: a DBR, a resonant cavity and a non-periodic sub-wavelength grating reflector. A planar incident light reaches the non-periodic sub-wavelength grating reflector through the resonant cavity to realize oblique reflection deflect towards the center of the resonant cavity, and the oblique reflection is subjected to multiple oscillation and coupling in the resonant cavity to form a stable standing wave field with light field energy concentrated on the middle portion of the resonant cavity, wherein the width of the standing wave field is determined by a structure of the non-periodic sub-wavelength grating, and therefore the structure of the non-periodic sub-wavelength grating is changed to achieve control of the width of the standing wave field in the resonant cavity. The problem is solved that a traditional resonant cavity cannot control the width of the standing wave field, and the resonant cavity based on the non-periodic sub-wavelength grating and the distributed bragg reflector can be widely applicable to the optical communication and optical system fields.