7results about How to "Reduce stray light interference" patented technology

The application provides a fiber-optic Fabry-Perot sensor based on light beam convergence and a manufacturing method thereof, and relates to the technical field of semiconductors. The sensor comprises a diaphragm layer, an intermediate layer and a bottom layer which are arranged in layers; the diaphragm layer is provided with a first groove, the intermediate layer is attached to the diaphragm layer in a manner that a first layer surface thereof faces the first groove, so as to form a Fabry-Perot cavity based on the first groove; the bottom layer is provided with a second groove, the intermediate layer is attached to the bottom layer in a manner that a second layer surface thereof faces the second groove, so as to form a nano-containing cavity based on the second groove; the second layer surface of the intermediate layer is formed with a micro-nano anti-reflection structure comprising array-distributed anti-reflection units located in the nano-containing cavity; and the bottom layer is formed with a micro-nano collimation structure comprising array-distributed collimation units located in the nano-containing cavity and in a symmetrical positional relationship with the micro-nano anti-reflection structure. The application at least reduces the manufacturing complexity.

The application belongs to the field of portable lighting devices, and discloses a portable lighting device with a window breaking function. The movable connecting mechanism enables the light source module to switch between a first position and a second position relative to the shell. The piercing part is fixedly installed at the end of the shell and coaxially arranged with the shell when in the first position. The central axis of the shell and the central axis of the piercing part are arranged at an angle when the piercing part is in the second position. When the piercing part is in the second position, the light source module automatically deviates from the space in front of the glass when breaking the window, thereby reducing the scratches and impacts of the splashed debris on the light source module, prolonging the service life of the lighting component, and isolating and significantly reducing the stress borne by the battery compartment and the internal battery cell due to the non-collinear angle formed between the piercing part and the shell when the piercing part is in the second position.

This invention provides a vision system and device for detecting defects in optical convex lenses, comprising three sets of vision inspection modules. The first and third vision inspection modules are mirror-symmetrical, respectively detecting defects on the left and right edges of the sample. The first vision inspection module includes a first inspection camera and a first inspection light source; the second vision inspection module includes a second inspection camera and a second inspection light source; and the third vision inspection module includes a third inspection camera and a third inspection light source. The first, second, and third inspection cameras are located at the same height above the sample. The first and third inspection light sources are located diagonally above opposite sides of the sample, with the same vertical distance from the sample. The second inspection light source is located diagonally above the sample, with a greater vertical distance from the sample than the first inspection light source. By combining dual-station collaborative inspection with special reflective film optical path optimization technology, full coverage and high-precision detection of surface defects in optical convex lenses are achieved.

This application discloses an AR display module, an AR display device, and a vehicle, belonging to the field of vehicle-mounted equipment technology. The AR display module includes: a light-emitting unit, a display and imaging unit, an optical path coupling unit, and an optical waveguide unit; wherein, the optical path coupling unit includes a triangular prism and a mirror assembly; the triangular prism includes a first optical surface, a second optical surface, and a third optical surface connected end-to-end, the first optical surface facing the emitting end of the display and imaging unit, the second optical surface facing the incident end of the optical waveguide unit, and the third optical surface facing the reflecting surface of the mirror assembly; a first polarization beam-splitting film is formed on the second optical surface; a quarter-wave plate structure is integrated into the mirror assembly. By using the triangular prism and the mirror assembly to filter the polarization state and fold the optical path of the image light, the image light can be efficiently coupled into the waveguide at an angle that meets the requirements of optical waveguide transmission, while improving the system's light utilization and integration.

This invention discloses a broadband linear graded filter for spectral imaging, possessing high transmittance and excellent stray light suppression performance. The filter employs a multilayer thin-film structure, including an interference cutoff film system above a substrate and a narrowband filter film system below. The narrowband filter film system achieves high transmittance in the 500-800 nm wavelength range through an optimized design using multiple alternating combinations of high and low refractive index materials. The interference cutoff film system effectively suppresses stray light through its long-pass and short-pass design.

The invention discloses a photoelectric volume pulse wave detection system based on a vertical cavity surface emitting laser, which is characterized in that a multi-wavelength VCSEL (vertical cavity surface emitting laser) is used as a core light emitting unit and is matched with a signal processing module, an embedded control module and an AI (artificial intelligence) sign analysis module to construct an integrated detection framework. According to the system, stable lasing is realized by optimizing a VCSEL epitaxial structure and a preparation process; a multi-wavelength PPG signal is accurately acquired in cooperation with a low-noise amplification-multistage filtering-adjustable gain signal processing link; the embedded control module dynamically adjusts light source parameters, and the AI engine realizes real-time accurate calculation of health parameters through multi-dimensional feature extraction and integrated learning model and fusion of multi-wavelength signals. The system has the advantages of high integration level, low power consumption and strong anti-interference performance, the core unit is packaged compactly, the system adapts to the long endurance requirement of wearable equipment, the detection precision is obviously improved compared with the traditional LED equipment, and a high-cost-performance solution can be provided for the scenes of consumer electronic health management, primary medical screening and the like.

The invention provides an optical system for complex system imaging, which comprises an eyepiece, an aperture diaphragm, an aberration eliminating lens group, a front field lens group, a rear field lens group and a prism group, a semi-transparent and semi-reflective mirror is arranged in the rear field lens group, light of a light source is irradiated to pupils through the eyepiece, reflected light of the eye ground comes out from the pupils, and the prism group is arranged on the eyepiece. Light passes through the eyepiece, the aperture diaphragm, the aberration eliminating lens group, the front field lens group and the rear field lens group and reaches the semi-transparent and semi-reflecting mirror, 50% of the light passes through the semi-transparent and semi-reflecting mirror and enters the prism group for RGB imaging, the other 50% of the light is reflected by the semi-transparent and semi-reflecting mirror for white light imaging, the front field lens group comprises a transmission-type deformable mirror, and the rear field lens group comprises a transmission-type deformable mirror. The fundus, the focusing surface of the aberration eliminating lens group, the focusing surface of the front field lens group and the focusing surface of the prism group are mutually conjugated, and the pupil, the aperture diaphragm and the transmission type deformable lens are mutually conjugated. According to the invention, high precision, high stability and high light energy utilization rate of the system in a complex imaging scene are ensured, and a solution is provided for multi-band and high-resolution diagnosis of fundus diseases.