Optischer inkrementaler Drehgeber in Low-Cost-Bauweise

Hopp, David; Pruß, Christof; Seybold, J.; Mayer, Volker; Heinz, Kuehn

doi:10.1524/teme.2010.0027

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The light is then diffracted at the encoder disc and reaches the photo detector. While laminar gratings result in two beams of equal intensity with the zero order of the beam being reflected into the light source [10][11][12][13][14][15], a blazed grating diffracts two beams of different intensities. This is due to the fact, that the zero order is diffracted into the +1st order beam.…”

Section: Main Principle Of the Encodermentioning

confidence: 99%

Miniaturized Optical Encoder with Micro Structured Encoder Disc

et al. 2019

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A novel optical incremental and absolute encoder based on an optical application-specific integrated circuit (opto-ASIC) and an encoder disc carrying micro manufactured structures is presented. The physical basis of the encoder is the diffraction of light using a reflective phase grating. The opto-ASIC contains a ring of photodiodes that represents the encryption of the encoder. It also includes the analog signal conditioning, the signal acquisition, and the control of a light source, as well as the digital position processing. The development and fabrication of the opto-ASIC is also described in this work. A laser diode was assembled in the center on top of the opto-ASIC, together with a micro manufactured polymer lens. The latter was fabricated using ultra-precision machining. The encoder disc was fabricated using micro injection molding and contains micro structures forming a blazed grating. This way, a 10-bit optical encoder with a form factor of only 1 cm 3 was realized and tested successfully. validation, J.S., A.B., A.F., and C.S.; formal analysis, J.S., A.B., A.F., and C.S.; investigation, J.S. and A.F.; resources, A.Z. and J.B.; writing-original draft preparation, J.S., A.B., and A.F.; writing-review and editing, K.-P.F. and C.S.; visualization, J.S.; supervision, A.Z. and J.B.; project administration, J.S. and A.F.; funding acquisition, J.

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Section: Main Principle Of the Encodermentioning

confidence: 99%

Miniaturized Optical Encoder with Micro Structured Encoder Disc

et al. 2019

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“…In this case, laser direct writing is used to produce the masks or masters. Figure 3 shows an example of a replicated DOE that is used as a cost efficient solid measure in a rotary encoder [1]. The tool was produced in a galvanic process directly from the photo resist structures written with our laser direct writing system CLWS300M (see Figure 2).…”

Section: Institut Für Technische Optik (Ito)mentioning

confidence: 99%

Laser direct writing

Häfner

Pruß

2011

Optik & Photonik

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Diffractive optics are compact and flexible optical elements with attractive properties that conventional refractive or reflective surfaces cannot deliver. While their fabrication is still challenging, the developments over the past years in both replication and mastering have advanced their application in fields like illumination shaping, metrology, laser beam forming, polarization shaping or fraud protection. A powerful tool for mastering is the technology of laser direct writing, initially developed for applications like mask production for lithography or mastering for optical data storage. In this contribution we present recent developments in laser direct writing technology for diffractive optics.The efficient fabrication of diffractive optics is of growing interest for many applications. While in conventional systems refraction or reflection on smooth optical surfaces is used to redirect the impinging light, a diffractive optical element uses diffraction on a microstructured surface to shape the incoming light into the desired output light field. The shape and position of the microstructures define their functionality. Typical structure heights for diffractive structures used in the visible spectrum are in the micrometer range, while the lateral dimensions of the individual microstructures can range from the order of the design wavelength or below up to several millimeters. Typical structure shapes are binary elements with only two levels in the structures, multilevel elements or quasi-continuous, saw-tooth like structures. Laser direct writingLaser direct writing of such structures has proven to be a flexible, fast and cost-effective approach. Depending on the application and process, the fabricated structures are used directly in the application or form the master shape for a subsequent replication process. Figure 1 gives a principle overview. There are processes that use laser direct writing to directly structure the surface (e.g., via ablation or thermal processes) or modify optical properties like the refractive index to obtain a diffractive optical element directly, but more common are photoresist based processes known from lithography as used in semiconductor manufacturing. Here, a photo sensitive layer, the photoresist layer, is coated onto a substrate. The thickness of the layer depends on the required structure depth and the subsequent process; typical values are a few hundred nanometers to a few micrometers. The photoresist changes its solubility depending on the energy that is absorbed by the writing laser. This allows in the subsequent developing step to obtain a photoresist profile from the light pattern that was written into the layer. The photoresist profile can be used directly as diffractive element for wavelengths

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Diffractive incremental and absolute coding principle for optical rotary sensors

et al. 2011

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Rotary sensors are an essential component in numerous applications where a rotation movement has to be detected. With optical encoders, a high angular resolution can be achieved. As a disadvantage, the resolution enhancement is associated with increasing cost. To overcome this issue, a coding principle is presented that uses a diffractive solid measure on a microstructured plastic disc. Like a DVD, this encoder disc can be manufactured in a cost effective injection molding process. For this approach, a differential incremental code, as well as an absolute code, has been developed.

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Optischer inkrementaler Drehgeber in Low-Cost-Bauweise

Cited by 3 publications

References 2 publications

Miniaturized Optical Encoder with Micro Structured Encoder Disc

Miniaturized Optical Encoder with Micro Structured Encoder Disc

Laser direct writing

Diffractive incremental and absolute coding principle for optical rotary sensors

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