10results about How to "Improve photosensitivity" patented technology

The present invention belongs to the technical field of holographic polymer materials, and specifically relates to a photopolymer holographic storage material, a holographic optical disc and a preparation method thereof. The photopolymer holographic storage material is prepared from raw materials in the following mass ratio: MMA: NMP: AIBN: PQ = 100: 5-25: 0.7-1: 1-1.5. The photopolymer holographic storage material is doped with NMP (N-methylpyrrolidone) in PQ / PMMA (phenanthrenequinone / polymethyl methacrylate) to significantly improve the optical properties of the material.

The invention discloses a preparation process of a photosensitive polyimide material, and belongs to the technical field of polyimide materials, diphenylethynyl is introduced into a polyamide acid molecule main chain, and a cross-linking point is constructed among the polyamide acid molecule main chains by utilizing photocrosslinking among the diphenylethynyl, so that the photosensitive polyimide material is prepared. A polyimide body solution capable of being developed by alkali liquor is obtained; and filtering, spin-coating, pre-baking, exposing, developing, cleaning and the like to obtain the polyimide material with the photosensitive characteristic. Besides, in order to improve the rate of photosensitive cross-linking reaction between polyamide acid molecular chains, and meanwhile, in order to obtain higher photosensitive sensitivity and maintain the advantage of alkali liquor development, a cross-linking agent and a photoinitiator can be added into the polyamide acid so as to improve the photoreaction efficiency of the polyamide acid. The preparation process of the photosensitive polyimide material solves the technical problem of how to improve the environmental protection property of the photosensitive polyimide material.

The application provides a kind of photoinitiator, holographic polymer dispersed liquid crystal material and its preparation method and application, the above-mentioned photoinitiator is a single-component photoinitiator, which is excited after absorbing photon and homolysis generates carbon radical with initiation polymerization activity;Compared with the holographic polymer dispersed liquid crystal material of the existing multi-component photoinitiating system, the chemical reaction in the molecule of the photoinitiator in the application cannot be disturbed by additive, which is cracked after being excited, effectively improves the generation efficiency of free radical, and can realize the holographic recording process faster, greatly improves the photosensitive sensitivity of holographic polymer material, effectively simplifies the formula of holographic polymer dispersed liquid crystal material, further reduces the production cost of holographic polymer dispersed liquid crystal material.

The invention belongs to the technical field of additive manufacturing, and discloses a laser energy deposition spectral signal acquisition device and method based on a photomultiplier, a collimating mirror is connected to a laser cladding head of a laser energy deposition forming system, the input end of a first single-channel optical fiber is connected with the output end of the collimating mirror, and the output end of the first single-channel optical fiber is connected with the output end of a second single-channel optical fiber; the output end of the first single-channel optical fiber is connected with the input end of the optical fiber splitter, the optical fiber splitter is provided with at least two output ends, each output end of the optical fiber splitter is connected with a second single-channel optical fiber, the output end of each second single-channel optical fiber is connected with a narrow-band optical filter, a photomultiplier is arranged behind each narrow-band optical filter, and the photomultiplier is connected with the optical fiber splitter. And the output end of each photomultiplier is connected to a digital acquisition card. The invention solves the problems of low sampling frequency, poor sensitivity under weak plasma, weak effective spectral signal and external signal interference of the current spectrograph, and the problem of insufficient refinement capability of a broadband photoelectric sensor.

This disclosure relates to an image sensor, camera module, and imaging device; the image sensor includes: a pixel array layer including a plurality of sub-pixels arranged in an array, the pixel array layer including a plurality of pixel groups, each pixel group including a first number of sub-pixels, the first number of sub-pixels being used to sense the same color, the first number being greater than 1; a first lens layer disposed on the light-incident side of the pixel array layer, including a plurality of first lenses disposed one-to-one with the plurality of sub-pixels; a second lens layer disposed on the side of the first lens layer away from the pixel array layer, including a plurality of second lenses disposed one-to-one with the plurality of pixel groups; each second lens being used to disperse incident light onto the first number of first lenses corresponding to each second lens; each first lens being used to focus light onto the sub-pixel corresponding to the first lens.

The invention discloses a sulfur-containing isocyanate-terminated first oligomer, a preparation method of the sulfur-containing isocyanate-terminated first oligomer, a sulfur-containing hydroxyl-terminated second oligomer, a preparation method of the sulfur-containing hydroxyl-terminated second oligomer, a photopolymer type holographic recording medium and a holographic optical element. The film-forming resin comprises a sulfur-containing isocyanate-terminated first oligomer and a polyhydroxy compound, or the film-forming resin comprises a sulfur-containing hydroxyl-terminated second oligomer and a polyfunctional isocyanate. In this way, environmental pollution and damage to health of production personnel caused by volatilization of mercaptan in the preparation process of the photopolymer type holographic recording medium can be effectively avoided, and the average refractive index of the photopolymer is increased.

The invention relates to recording 3D image data using light sectioning. A camera (10) for recording 3D image data (20) using light sectioning is presented, the camera (10) comprising: an illumination unit (12) for projecting a light pattern (14) in a focal plane (28); an image sensor (22) having a plurality of light-receiving elements in an image plane; a receiving optics (26) arranged upstream of the image sensor (22) and having a lens plane; and a control and evaluation unit (24) which is designed to generate 3D image data by evaluating the light pattern (14) in the recording of the image sensor (22), the image plane being inclined with respect to the focal plane (28). In this case, the receiving optics (26) have at least one optical super element (30), which compensates for an oblique light incidence on the light receiving element.

A time-of-flight sensor pixel circuit, structure and time-of-flight sensor, including a row a and b column pixel units; in the M-th row and N-th column pixel units, a photoelectric conversion element receives a modulated light wave to generate charges; a first charge storage transfer circuit to a fourth charge storage transfer circuit selectively modulate charges corresponding to four phases of the modulated light wave according to four charge modulation signals to generate four integrated charge signals, and output the four integrated charge signals according to four control selection signals; a charge readout circuit outputs a third photoelectric signal and a second photoelectric signal according to a third integrated charge signal and a second integrated charge signal, respectively; the charge readout circuit also outputs a first photoelectric signal and a fourth photoelectric signal of the M-th row and N+1 column pixel unit according to the first integrated charge signal and the fourth integrated charge signal outputted from the M-th row and N+1 column; therefore, the left and right adjacent pixel units share the charge readout circuit, saving area and improving the photosensitivity of the pixels.

The application belongs to the technical field of acrylic resin, and particularly relates to an acrylic resin and a preparation method thereof. The target acrylic resin is prepared through free radical polymerization, and the acrylic resin is mainly formed by copolymerization of a p-hydroxystyrene monomer unit A and an adamantyl unsaturated ester monomer unit B. The acrylic resin has a weight average molecular weight of 3000-9500 and a molecular weight distribution of 1.2-2.0. The application further provides a preparation method of the acrylic resin. The photoresist prepared by using the acrylic resin has high photosensitivity, excellent heat resistance and etching resistance under the condition of a 1-5 mu thick film, and has good uniformity of the formed film layer, no cracks and no phase separation, thereby effectively optimizing the comprehensive performance of the thick film photoresist.

The invention relates to the technical field of materials, in particular to a polyimide precursor and a preparation method thereof, a polyimide precursor glue solution and a preparation method thereof, and a polyimide film. The main chain of the polyimide precursor contains a keto-carbonyl self-sensitizing group and a group containing abstractable reactive hydrogen, and the keto-carbonyl self-sensitizing group and the group can realize photo-crosslinking. Meanwhile, the polyimide precursor also has an ester-type photosensitive branched chain, and a cross-linked structure is easily formed under the action of a photo-crosslinking agent and the like, so that dual sensitization is realized. The polyimide film prepared from the polyimide precursor not only retains the high resolution of ester type photosensitive polyimide, but also reduces the proportion of photosensitive branched chains in the structure, so that the film shrinkage effect after curing is reduced, and the prepared polyimide film has both high resolution and lower film thickness shrinkage rate.