Fabrication of small aspheric moulds using single point inclined axis grinding

Chen, Fengjun; Yin, Shu; Huang, Han; Ohmori, Hitoshi

doi:10.1016/j.precisioneng.2014.06.009

Cited by 32 publications

(6 citation statements)

References 26 publications

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“…The molds were machined based on the ultra-precision lathe (650FG, Moore Nanotechnology System). The normal single point grinding method based on B axis was used [17][18][19][20]. The resin binder cylindrical diamond grinding wheel with rounded corner of #325 and #2000 was respectively used for crude grinding and fine grinding of the molds.…”

Section: Mold Pre-compensationmentioning

confidence: 99%

Pre-Compensation of Mold in Precision Glass Molding Based on Mathematical Analysis

Zhang

You

2020

Micromachines

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Precision glass molding is the most appropriate method for batch production of glass lenses with high surface accuracy and qualified optical performance. However, the form error caused by material expansion and contraction is the main factor affecting the precision of the molded lenses, thus the mold must be pre-compensated. In this paper, an effective method of mold pre-compensation based on mathematical analysis is established. Based on the thermal expansion curve of D-ZK3 glass, the freezing fictive temperature of the glass under the actual cooling rate is measured, and the mold pre-compensation factor can be quickly calculated. Experimental results show that the peak valley (PV) value of the surface form error of molded aspheric lens with an aperture of 5.3 mm is effectively reduced from 2.04 μm to 0.31 μm after the pre-compensation, thus meeting the geometric evaluation criterion.

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Section: Mold Pre-compensationmentioning

confidence: 99%

Pre-Compensation of Mold in Precision Glass Molding Based on Mathematical Analysis

Zhang

You

2020

Micromachines

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“…Traditional macroscopic optical systems are usually composed of macroscopic optical elements, which have the problems of bulky volume, high energy consumption, and low design freedom [1][2][3] . By contrast, microoptical elements and stereoscopic systems with miniaturized sizes, integrated modules, diversified functions, and low power consumption show significant advantages in imaging (such as biomedical imaging, photonics chip imaging, and infrared imaging) and nonimaging (such as beam shaping, optical fiber and waveguide fabrication, and optical storage) applications [4][5][6][7][8][9] . With the development of modern information technology, increasing demand has been observed for microoptical elements and systems [10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Imaging/nonimaging microoptical elements and stereoscopic systems based on femtosecond laser direct writing

Huang,

Hong,

Chen

et al. 2023

gxjzz

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The development of modern information technology has led to significant demand for microoptical elements with complex surface profiles and nanoscale surface roughness. Therefore, various micro-and nanoprocessing techniques are used to fabricate microoptical elements and systems. Femtosecond laser direct writing (FsLDW) uses ultrafast pulses and the ultraintense instantaneous energy of a femtosecond laser for micro-nano fabrication. FsLDW exhibits various excellent properties, including nonlinear multiphoton absorption, high-precision processing beyond the diffraction limit, and the universality of processable materials, demonstrating its unique advantages and potential applications in three-dimensional (3D) micro-nano manufacturing. FsLDW has demonstrated its value in the fabrication of various microoptical systems. This study details three typical principles of FsLDW, several design considerations to improve processing performance, processable materials, imaging/nonimaging microoptical elements, and their stereoscopic systems. Finally, a summary and perspective on the future research directions for FsLDW-enabled microoptical elements and stereoscopic systems are provided.

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“…However, studies pertaining to wheel setting for the grinding of aspheric optics are rare. Chen et al [34] discovered that inward and outward offsets generated V-shaped and Λ-shaped profiles, respectively. However, the relationship between wheel setting error and workpiece form error has not been analytically modeled.…”

Section: Introductionmentioning

confidence: 99%

Wheel Setting Error Modeling and Compensation for Arc Envelope Grinding of Large-Aperture Aspherical Optics

Sun

Chen

et al. 2022

Chin. J. Mech. Eng.

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Precision grinding is a key process for realizing the use of large-aperture aspherical optical elements in laser nuclear fusion devices, large-aperture astronomical telescopes, and high-resolution space cameras. In this study, the arc envelope grinding process of large-aperture aspherical optics is investigated using a CM1500 precision grinding machine with a maximum machinable diameter of Φ1500 mm. The form error of the aspherical workpiece induced by wheel setting errors is analytically modeled for both parallel and cross grinding. Results show that the form error is more sensitive to the wheel setting error along the feed direction than that along the lateral direction. It is a bilinear function of the feed-direction wheel setting error and the distance to the optical axis. Based on the error function above, a method to determine the wheel setting error is proposed. Subsequently, grinding tests are performed with the wheels aligned accurately. Using a newly proposed partial error compensation method with an appropriate compensation factor, a form error of 3.4 μm peak-to-valley (PV) for a Φ400 mm elliptical K9 glass surface is achieved.

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Fabrication of small aspheric moulds using single point inclined axis grinding

Cited by 32 publications

References 26 publications

Pre-Compensation of Mold in Precision Glass Molding Based on Mathematical Analysis

Pre-Compensation of Mold in Precision Glass Molding Based on Mathematical Analysis

Imaging/nonimaging microoptical elements and stereoscopic systems based on femtosecond laser direct writing

Wheel Setting Error Modeling and Compensation for Arc Envelope Grinding of Large-Aperture Aspherical Optics

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