64results about How to "Large scanning area" patented technology

In an optical angle-measuring device for ascertaining the relative movement between at least one scanning grating and a graduated disk having at least one measuring graduation, the scanning grating is in the form of a linear scanning grating, and the graduated disk includes a first and a second combined radial-circular grating as measuring graduation, and has a mirror. An incident beam of rays is initially split at the scanning grating into two partial beams of rays that then propagate in the direction of the first combined radial-circular grating and are diffracted there, then propagate in the direction of the mirror and are reflected there in the direction of the second combined radial-circular grating, subsequently propagate in the direction of the second combined radial-circular grating and are diffracted there, and then propagate in the direction of the scanning grating, where a superposition of the partial beams of rays results.

The invention discloses an automatically stretching type vertical-axis wind driven generator comprising a generator, a spindle, a spoke, vanes, a support rib and a screw rod. The screw rod is mounted on the spindle which is connected with the generator, and the vanes are mounted on the spindle through the spoke and connected with the screw rod through the support rib. The automatically stretching type vertical-axis wind driven generator further comprises a support frame, a heavy ball, a gear, an inner sleeve, an outer sleeve, an inner brake and an outer brake, when the wind speed is too high, the heavy ball locks the outer sleeve, the gear drives the screw rod to move downwards, the vanes close up, and the outer brake limits the displacement of the screw rod; when the speed is too low, the heavy ball lock the inner sleeve, the gear drives the screw rod to move upwards, the vanes expand, and the inner brake limits the displacement of the screw rod. The automatically stretching type vertical-axis wind driven generator is driven without a motor, vanes' sweeping area is decreased automatically when wind speed is too high and increased automatically when wind speed is too low, the generating capacity of the vertical-axis wind driven generator is increased, safe and stable running of the vertical-axis wind driven generator is guaranteed.

The embodiment of the invention discloses a wavelength conversion device and a projection system. The wavelength conversion device comprises an excitation light source, a light emitting module and a first vibration system, and is characterized in that the excitation light source is used for emitting excitation light, the light emitting module is used for receiving the excitation light, converting the received excitation light into light with specific wavelength and emitting the light, and the first vibration system is located at the side, which is away from the excitation light source, of the light emitting module and used for driving the light emitting module to move in a reciprocating manner along a first preset direction. In the wavelength conversion device provided by the embodiment of the invention, the scanning area of convergent light spots of the excitation light in unit time is increased through reciprocating movements of the light emitting module, and the scanning area of the convergent light spots of the excitation light is not enabled to be fixedly concentrated in a certain area of the light emitting module, so that the energy density borne by a light emitting layer in the light emitting module in unit time and unit area is effectively reduced, the heat dissipation effect of the wavelength conversion device is improved, and the light emitting efficiency of the wavelength conversion device is improved.