scholarly journals Naked-Eye 3D Display Based on Microlens Array Using Combined Micro-Nano Imprint and UV Offset Printing Methods

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2012 ◽  
Author(s):  
Linyi Chen ◽  
Guangxue Chen ◽  
Liyu Liao ◽  
Haozhi Chen
Keyword(s):  
Large Scale ◽  
Production Efficiency ◽  
Focal Length ◽  
Numerical Aperture ◽  
Microlens Array ◽  
Curvature Radius ◽  
3D Display ◽  
Offset Printing ◽  
Naked Eye ◽  
Nano Imprint

An optical film integrating microlens array (MLAs) and 3D micro-graphics is an important way to achieve the naked-eye 3D display effect. The 3D micro-graphics is traditionally generated by the micro-nano imprint technology based on precision engraving mold, which leads to high production cost and low production efficiency, and thus restricts the rapid response to production tasks and large-scale popularization and application. In this study, a process scheme for large-scale printing of 3D micro-graphics using UV offset printing based on presensitized (PS) plate was proposed, matching with the MLAs fabricated by micro-nano imprint process to achieve naked-eye 3D display effect. We used the laser confocal microscope to systematically measure and analyze the geometric and optical performance of the fabricated MLAs in terms of height, curvature radius, center distance, spacing, focal length, and numerical aperture, and evaluated the influence of the publishing resolution of the PS plate on the display effect of 3D micro-graphics. The printing quality and display effect of 3D micro-graphics were further improved by adjusting process parameters such as printing speed and printing pressure. The results of the current study demonstrate that the combined application of micro-nano imprint technology based on precision mold and UV offset printing technology based on PS plate can achieve an excellent naked-eye 3D display effect in 360° all angles, which is efficient, cost-saving, and highly flexible.

scholarly journals Large-scale microlens arrays on flexible substrate with improved numerical aperture for curved integral imaging 3D display

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Wenwen Wang ◽  
Guixiong Chen ◽  
Yalian Weng ◽  
Xuyang Weng ◽  
Xiongtu Zhou ◽  
...  
Keyword(s):  
Large Scale ◽  
Flexible Substrate ◽  
Numerical Aperture ◽  
3D Display ◽  
Microlens Arrays ◽  
Integral Imaging

scholarly journals Design and Fabrication of Flexible Naked-Eye 3D Display Film Element Based on Microstructure

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 864 ◽  
Author(s):  
Axiu Cao ◽  
Li Xue ◽  
Yingfei Pang ◽  
Liwei Liu ◽  
Hui Pang ◽  
...  
Keyword(s):  
High Resolution ◽  
Information Acquisition ◽  
Structural Model ◽  
Three Dimensional ◽  
Microlens Array ◽  
Development Trend ◽  
3D Display ◽  
Naked Eye ◽  
Film Substrate ◽  
Film Element

The naked-eye three-dimensional (3D) display technology without wearing equipment is an inevitable future development trend. In this paper, the design and fabrication of a flexible naked-eye 3D display film element based on a microstructure have been proposed to achieve a high-resolution 3D display effect. The film element consists of two sets of key microstructures, namely, a microimage array (MIA) and microlens array (MLA). By establishing the basic structural model, the matching relationship between the two groups of microstructures has been studied. Based on 3D graphics software, a 3D object information acquisition model has been proposed to achieve a high-resolution MIA from different viewpoints, recording without crosstalk. In addition, lithography technology has been used to realize the fabrications of the MLA and MIA. Based on nanoimprint technology, a complete integration technology on a flexible film substrate has been formed. Finally, a flexible 3D display film element has been fabricated, which has a light weight and can be curled.

scholarly journals P/Halley: The Disconnection Event of 1986 April 11

1988 ◽  
Vol 98 ◽  
pp. 155-157 ◽  
Author(s):  
P.M. Bergé ◽  
G. Mahoux ◽  
A.C. Levasseur-Regourd
Keyword(s):  
Southern Hemisphere ◽  
Large Scale ◽  
Focal Length ◽  
La Réunion ◽  
Structure Dynamics ◽  
Plasma Tail

This work was carried out by an expedition organized by the S.A.F. in 1986 April to La Réunion. The aim was to observe and photograph P/Halley, within the framework of IHW, as part of the Island Network in the southern hemisphere. To be more precise, our work consisted of studying large-scale phenomena: the structure, dynamics and possible disconnection events in the plasma tail. We were lucky enough to observe one of the latter on the night of April 11/12, and describe it here.For the Island Network, IHW had a number of Schmidt telescopes (Celestron 8). One was lent to the S.A.F. and this is what we used. This telescope has a focal ratio of 1.5, with a 200-mm (8-inch) objective and 300-mm focal length. We used only Kodak TP2415 film, hypersensitized in forming gas (24h at 60°C).

scholarly journals Fault diagnosis of industrial robot reducer by an extreme learning machine with a level-based learning swarm optimizer

2021 ◽  
Vol 13 (5) ◽  
pp. 168781402110195
Author(s):  
Jianwen Guo ◽  
Xiaoyan Li ◽  
Zhenpeng Lao ◽  
Yandong Luo ◽  
Jiapeng Wu ◽  
...  
Keyword(s):  
Fault Diagnosis ◽  
Extreme Learning Machine ◽  
Large Scale ◽  
Production Efficiency ◽  
Industrial Robot ◽  
Optimal Solution ◽  
Industrial Robots ◽  
Generalization Performance ◽  
Gradient Descent Algorithm ◽  
Learning Machine

Fault diagnosis is of great significance to improve the production efficiency and accuracy of industrial robots. Compared with the traditional gradient descent algorithm, the extreme learning machine (ELM) has the advantage of fast computing speed, but the input weights and the hidden node biases that are obtained at random affects the accuracy and generalization performance of ELM. However, the level-based learning swarm optimizer algorithm (LLSO) can quickly and effectively find the global optimal solution of large-scale problems, and can be used to solve the optimal combination of large-scale input weights and hidden biases in ELM. This paper proposes an extreme learning machine with a level-based learning swarm optimizer (LLSO-ELM) for fault diagnosis of industrial robot RV reducer. The model is tested by combining the attitude data of reducer gear under different fault modes. Compared with ELM, the experimental results show that this method has good stability and generalization performance.

A Novel Real-Time Thermal Analysis and Layer Time Control Framework for Large Scale Additive Manufacturing

2020 ◽  
Author(s):  
Sepehr Fathizadan ◽  
Feng Ju ◽  
Kyle Rowe ◽  
Alex Fiechter ◽  
Nils Hofmann
Keyword(s):  
Additive Manufacturing ◽  
Surface Temperature ◽  
Real Time ◽  
Large Scale ◽  
Production Efficiency ◽  
Control Method ◽  
Data Extraction ◽  
Critical Role ◽  
Imaging Data ◽  
Time Data

Abstract Production efficiency and product quality need to be addressed simultaneously to ensure the reliability of large scale additive manufacturing. Specifically, print surface temperature plays a critical role in determining the quality characteristics of the product. Moreover, heat transfer via conduction as a result of spatial correlation between locations on the surface of large and complex geometries necessitates the employment of more robust methodologies to extract and monitor the data. In this paper, we propose a framework for real-time data extraction from thermal images as well as a novel method for controlling layer time during the printing process. A FLIR™ thermal camera captures and stores the stream of images from the print surface temperature while the Thermwood Large Scale Additive Manufacturing (LSAM™) machine is printing components. A set of digital image processing tasks were performed to extract the thermal data. Separate regression models based on real-time thermal imaging data are built on each location on the surface to predict the associated temperatures. Subsequently, a control method is proposed to find the best time for printing the next layer given the predictions. Finally, several scenarios based on the cooling dynamics of surface structure were defined and analyzed, and the results were compared to the current fixed layer time policy. It was concluded that the proposed method can significantly increase the efficiency by reducing the overall printing time while preserving the quality.

Cooling Process for Directional Solidification in Directed Energy Deposition

2018 ◽  
Author(s):  
Keiya Ishiyama ◽  
Ryo Koike ◽  
Yasuhiro Kakinuma ◽  
Tetsuya Suzuki ◽  
Takanori Mori
Keyword(s):  
Directional Solidification ◽  
Thermal Gradient ◽  
Large Scale ◽  
Energy Deposition ◽  
Production Efficiency ◽  
Production Costs ◽  
Special Structure ◽  
Mechanical Stiffness ◽  
Directed Energy Deposition ◽  
Directed Energy

Additive manufacturing (AM) for metals has attracted attention from industry because of its great potential to enhance production efficiency and reduce production costs. Directed energy deposition (DED) is a metal AM process suitable to produce large-scale freeform metal products. DED entails irradiating the baseplate with a laser beam and launching the metal powder onto the molten spot to produce a metal part on the baseplate. Because the process enables powder from different materials to be used, DED is widely applicable to valuable production work such as for a dissimilar material joint, a graded material, or a part with a special structure. With regard to parts with a special structure, directional solidification can prospectively be used in the power plant and aerospace industries because it can enhance the stiffness in a specific direction via only a simple process. However, conventional approaches for directional solidification require a special mold in order to realize a long-lasting thermal gradient in the part. On the other hand, from the viewpoint of thermal distribution in a produced part, DED is able to control the gradient by controlling the position of the molten pool, i.e., the position of the laser spot. Moreover, unlike casting, the thermal gradient can be precisely oriented in the expected direction, because the laser supplies heat energy on the regulated spot. In this study, the applicability of DED to directional solidification in Inconel® 625 is theoretically and experimentally evaluated through metal structure observation and Vickers hardness measurements. Furthermore, the effect of two different cooling processes on directional solidification is also considered with the aim of improving the mechanical stiffness of a part produced by DED. The observations and experimental results show that both the cooling methods (baseplate cooling and intermittent treatment with coolant) are able to enhance the hardness while retaining the anisotropy.

scholarly journals Cloud-Based Education As a Service (CEAAS) System Requirements Specification Model of Higher Education Institutions in Industrial Revolution 4.0

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1382-1386 ◽  
Keyword(s):  
Higher Education ◽  
Data Exchange ◽  
Large Scale ◽  
Production Efficiency ◽  
Industrial Revolution ◽  
Higher Education Institutions ◽  
Requirements Specification ◽  
Scale Production ◽  
Research And Innovation ◽  
System Requirements

In today’s higher education institutions (HEIs), intelligentization and digitization of education process are greatly required. Production industries are presently making changes from large-scale production to specialized or customized production. The term Industry 4.0 (IR 4.0) represents the fourth industrial revolution; the present movement or inclination of automation and data exchange and sharing in manufacturing technologies with the main aim of satisfying the individual customer desire and needs. The quick progressions in production technologies and its uses in the industries enhance production efficiency and change the workplace from tasks-based to the human-focused features. Higher education in the IR 4.0 (HE 4.0) is a complex, intricate and intriguing opportunity which has the potential to change the society for the better. The convergence and integration of man and machine will decrease the subject distance between social science and humanity and also technology and science. This will definitely need in-depth and diverse interdisciplinary teaching, research and innovation. Cloud computing (CC) as an IR 4.0 contributing technology, provides a novel means of educating people that will ultimately disrupt the present HEIs systems. Cloud-based education as a service in the era of fourth industry (CEaaS 4.0) can deliver education services in the shortest, most effective, and best affordability. The aim of this study is to propose a CEaaS system requirements specification (SRS) model that includes functional and non-fictional requirements; aligned with IR 4.0, the next industrial revolution.

Defocus measuring the focal length of microlens array by grating prismatic interference

2010 ◽  
Author(s):  
Xianchang Zhu ◽  
Xuedong Cao ◽  
Shibin Wu ◽  
Fan Wu
Keyword(s):  
Focal Length ◽  
Microlens Array

scholarly journals Electrically Tunable-Focusing Liquid Crystal Microlens Array with Simple Electrode

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 431 ◽  
Author(s):  
Li-Lan Tian ◽  
Fan Chu ◽  
Hu Dou ◽  
Lei Li ◽  
Qiong-Hua Wang
Keyword(s):  
Liquid Crystal ◽  
Indium Tin Oxide ◽  
Focal Length ◽  
Microlens Array ◽  
Operating Voltage ◽  
Focusing Effect ◽  
Horizontal Orientation ◽  
Wide Range ◽  
Planar Electrodes ◽  
The Individual

An electrically tunable-focusing liquid crystal (LC) microlens array exhibiting a wide-range tunable focal length is proposed. The lower substrate has strip indium tin oxide (ITO) electrodes, the upper substrate has periodic ITO electrodes with a certain gap coated on the inner surface., and an LC microlens is generated between the two strip electrodes. For each LC microlens, the gap between the top planar electrodes is directly above the center of the microlens. Unlike the conventional LC lens, the individual LC microlens is not coated with ITO electrodes on the central part of its upper and lower substrates, which helps to maintain the LC’s horizontal orientation. In the voltage-off state, the focal length of the microlens array is infinity because of the homogeneous LC alignment. At a given operating voltage, an ideal gradient refractive index distribution is induced over the homogeneous LC layer, which leads to the focusing effect. The simulation result shows that the focal length of the LC microlens could be gradually drawn to 0.381 mm with a change of voltage.

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