F theta scan lens is used in conjunction with xy galvanometer scanner and beam expander to form a two dimensions scanning system. Ftheta lenses are plane field objectives, which are commonly used in combination with xy galvanometer scanner. Standard lenses focus the laser beam on a spherical surface in contrast to an ideal flat or plane field. A lens design form can be a combination of positive optical power and negative optical power lens elements that share characteristics with each other. Customized and standardized objective lenses jenoptik. Conrady in applied optics and optical design and rudolph kingslake in lens design. Known ftheta lenses used in laser scanner system is one of the most popular lenses of this type. The ability to quickly perform repeatable, high accuracy measurements is critical to maximize the performance of many machine vision systems. The enabling key component, ftheta lenses, is designed as micrometer focusing scanning lens. These lenses are able to realize tighter spot sizes, which translate into higher resolution for scanning or printing, as. In this paper, the design of the fthea lens with large working area is described in detail. The diffractionlimited, multipleelement, airspaced lens design is optimized for a flat field in the image plane and low f theta distortion. The linos ftheta lenses for laser material processing guarantee the best processing results over the entire working field.
The effective focal length efl, flange focal length ffl and back focal length bfl have been calculated by means of paraxial relations. Barry johnson is a disciple of conrady and kingslake, and who has a deep background in lens. Scanning lenses ftheta product information optical. Ftheta lens lens, mirror for co2 laser laser optics. Highly precise telecentric lenses minimize distortion and make a laser beam. It provides full glass highperformance lens, and different lenses meet the functions of a3, a4, barcode scanning.
The design and the quality of the optical components play a key role in the lens performance. It is suitable for processing such as laser micro drilling. Key specifications for this lens are listed to the right. Selecting the right lens specifications for ftheta applications can be a challenge all in itself for additive manufacturing, laser material processing, semiconductor manufacturing, and. Mechanism design is a field in economics and game theory that takes an objectivesfirst approach to designing economic mechanisms or incentives, toward desired objectives, in strategic settings, where players act rationally. Ftheta lenses shanghai optics custom optical lens design. What are required for such kind of lenses is that their image height is proportional to the incident angle of laser beams through introducing reasonable barrel distortion so as to mark linearly. Zebase 6 is a collection of over 600 sequential optical designs in opticstudio format on cd. Development of ftheta lens for printed wiring board processing.
Pdf optical design and performance of ftheta lenses for. Ftheta lenses are the standard lenses for galvoscannerbased laser marking, engraving, and cutting systems. Part of the lens design form is from the configuration, as it is important to be able to see the configuration of the lens and decipher what it. The use of ftheta lenses provides a plane focusing surface and almost constant spot size over the entire xy image plane or scan field. Thermal lens, which occurs at high power laser applications and leads to afocal shift, is also minimized. Airspaced 3 or 4element designs transmission of 90% f theta condition accuracy of better than 0. Advancements in ftheta lens design and performance. A telecentric f theta lens differs from a normal f theta lens in that the axis of the focused laser beam bundle is perpendicular to the scanning plane throughout. Send mail to webmaster with questions or comments about this web site. Method of analyzing the singlet ftheta scan lens for laser. Scanning lenses ftheta optical components scanning lenses product information cascade laser corp. The window is coated with super hard dlc diamond like carbon and protects an ftheta lens from back scatters.
Optical engineers differ between telecentric and nontelecentric ftheta lenses fig. The paper provides the new type construction of laser confocal microarray scanning and fluorescent detection system. Lens curvature, width, position, type of glass some can be fixed, other vary with focal length, focus e. Lens design crc press book there is no shortage of lens optimization software on the market to deal with todays complex optical systems for all sorts of custom and standardized applications. Design examples of several widely used modern lenses are provided. Optical design of ftheta lenses, which fit for laser marking as the focusing lenses, is introduced. Design of ftheta lenses used in laser marking machines. For imagespace telecentric system, shown in fig 6, the working f number is defined as. Any good resources on some of these imaging concepts specifically in the context of wide angle lenses. These lenses are made with low dispersion fused silica with optical design to avoid back reflection and ghost image. High performance ftheta lenses, realized by combining lens design techniques with antireflective coating technology. We will propose and design the optimum lens for your needs.
Jan 20, 2006 the paper provides the new type construction of laser confocal microarray scanning and fluorescent detection system. Telecentric f theta lenses require very large lens diameters for long scanning paths lens diameter approx. In this paper, the design of the f thea lens with large working area is described in detail. If the psf does change depending on the lens type, how would i calculate the diffractionlimited psf for, say, an ftheta lens. Development of ftheta lens for printed wiring board. These lenses can contribute to providing your requirements in production, especially for sophisticated applications.
Ftheta lenses solve many of the problems associated with laser scanning. Laser beams move parallel to the optical axis after passing a telecentric lens. An example for the use of an ftheta lens with beam deflection through two galvomirrors. Specifications compact, highperformance ftheta lenses. A practical guide to lens design focuses on the very detailed practical process of lens design. The adjacent plot shows departure from perfect linear ftheta mapping for each of the full field fisheye lenses. Black art of massaging the merit function optimize for all image locations all wavelengths all apertures. With offices in nanjing beside shanghai, peoples republic of china ftheta provides industry leading customized products, prepostsales support, technical assistance and training. Hence, the focal lens of the scanning system usually uses the f theta lens to solve this problem. Fisheye lens designs and their relative performance.
Ftheta group is the industry standard for laser optical and provide the solutions to the engineers and researchers worldwide. Advancements in ftheta lens design and performance presented by. Standard fused silica f theta lenses are suitable for all highpowerlaser applications like welding, cleaning and structuring. If the image height is direct linearly depending on the mirror angle, we have the so called ftheta lenses. The lens is close to the diffraction limit and has small distortion, which meets the requirements of use.
Ftheta lenses available only as spare part for dilas diode laser system or in combination with the galvo scanner. The initial targets were aimed at classical laser lens, but over the years the capabilities and breadth of team it could handle expanded immensely. Fisheye lens designs and their relative performance james jay kumlera, martin bauerb. Additionally, the compact design of the f theta lens allows the user to reduce the number of optical components needed to provide a flat image plane. Optical engineers working in lens design will find this book an invaluable guide to lens design in traditional and emerging areas of application. The scanner exploits the functional advantages and the optical system has small spot size, great linearity and large depth of focus. Optical design and performance of ftheta lenses for high. It adds impressive building blocks to the foundation established by a. Geomatec ftheta lenses high precision, short lead time. Every step from setup specifications to finalizing the design for production is discussed in a straight forward, tangible way. Ftheta scan lens scan lenses are used for moving a field point over the image area by rotating a mirror. Orthographic projection, is like taking the cross section of a sphere, and projecting that crosssection directly. Lens design fundamentals, second edition, is the most comprehensive treatise to be published on the subject of lens design. These requirements are met with the use of ftheta lens, a compound lens which has an optical design to suppress the aberration to the diffractionlimited level, and a precise aspheric surface.
In this paper, the author outlines the engineering of the ftheta lens and its applications. It is one of the most important parts of laser scanning system. F theta lenses catalog 2017 f theta lenses for galvo systems efl 100 mm, 160 mm, 254 mm accurate beam position design wavelength 1064 nm and 532 nm opto5 f theta lenses meet the standard requirements for the laser marking world, combining the popular focal length range and mount selection with uniform beam quality. F theta lenses are the standard lenses for galvoscannerbased laser marking, engraving, and cutting systems. Optical engineers differ between telecentric and nontelecentric f theta lenses fig. The lsm03vis scan lens is designed and ar coated for imaging over the visible wavelength range 400 to 700 nm. In order to design an f theta lens used for laser marking machine, the desired amount of barrel. In this paper, the author outlines the engineering of the f theta lens and its applications.
F theta lenses solve many of the problems associated with laser scanning. Apr 23, 2016 by using non uniform rational bspline nurbs curves for f theta lens correction higher order spatial derivatives are analytic and continuous for the smoothest possible corrected motion capability. Telecentric ftheta lens for highspeed terahertz reflection threedimensional imaging abstract. Ftheta scanning lenses general handling instruction manual. The listed ftheta lenses accomplish the fthetacondition better than 0. By using non uniform rational bspline nurbs curves for ftheta lens correction higher order spatial derivatives are analytic and continuous for. Scanning lenses f theta optical components scanning lenses product information cascade laser corp. This webcast, presented by jenoptik, will focus on ftheta lens design challenges that include field of view, linearity, spot uniformity through focus and distortion as well as technical challenges such as high power designs vs. Telecentric ftheta lenses require very large lens diameters for long scanning paths lens diameter approx. I probably can understand the math to do it although i dont have optics background more like signal processing. The adjacent plot shows departure from perfect linear f theta mapping for each of the full field fisheye lenses. In lens design with large computers, proceedings of the conference, institute of optics, government superintendent, rochester, new york. F theta, telecentric f theta lens, ftheta objective lens.
As a leader in japan, they have economies of scale which translates to. A telecentric ftheta lens differs from a normal ftheta lens in that the axis of the focused laser beam bundle is perpendicular to the scanning plane throughout. While this lens design is optimized for oct imaging, it may also be used in a variety of laser scanning microscopy applications. Contrary to a normal lens which focuses a input collimated beam on a spherical image plane, a f theta lens focuses on a flat image surface. For such systems, a telecentric lens allows the highest possible accuracy to be obtained. Laser scanning microarray reader article pdf available in optical and quantum electronics 37. It is applied to the flatbed scanner and high shot instrument equipment. But all of these software packages share one critical flaw. F theta lenses are different from normal camera lenses. Optical design and performance of ftheta lenses for highpower and highprecision applications. Highspeed terahertz reflection threedimensional imaging is demonstrated using electronically controlled optical sampling ecops and beam steering. Ftheta lenses catalog 2017 ftheta lenses for galvo systems efl 100 mm, 160 mm, 254 mm accurate beam position design wavelength 1064 nm and 532 nm opto5 ftheta lenses meet the standard requirements for the laser marking world, combining the popular focal length range and mount selection with uniform beam quality. Tutorial of telecentric lens university of arizona. Contrary to a normal lens which focuses a input collimated beam on a spherical image plane, a ftheta lens focuses on a flat image surface.
These requirements are met with the use of f theta lens, a compound lens which has an optical design to suppress the aberration to the diffractionlimited level, and a precise aspheric surface. Zebase 6 includes a copy of milton laikins book, lens design, and includes designs from the book as well as many other sources. Although i have taken a great deal of effort to assure accuracy, the user of any of. It is used for high speed micro drilling of printed circuit boards, highspeed marking of electronic parts and resin parts, etc. There is no shortage of lens optimization software on the market to deal with todays complex optical systems for all sorts of custom and standardized applications. The results indicate the f theta lens can increase the quality of the drilling holes and amend the projection plane. Lenses and depth of field university of california, irvine. This section discusses the unique performance characteristics of telecentric lenses and how telecentricity can. This paper proposes a method utilizing the zemax to analyze the commercial f theta lens. Continuing the bestselling tradition of the authors previous books, lens design, fourth edition is still the most complete and reliable guide for detailed design information and procedures for a wide range of optical systems. Gorny optical design and performance of ftheta lenses for highpower. Additionally, the compact design of the ftheta lens allows the user to reduce the number of optical components needed to provide a flat image plane.
Geomatec makes high precision ftheta lenses and beam expanders to rival the best in the world. Optical design and performance of f theta lenses for highpower and highprecision applications conference paper pdf available september 2015 with 5,999 reads how we measure reads. Dec 05, 2001 known f theta lenses used in laser scanner system is one of the most popular lenses of this type. F theta lenses are commonly used in laser scanning systems that require a flat image plane and high resolution. Geomatec, a leading optics manufacturer in japan, is now available in the us market. The lens is close to the diffraction limit and has small distortion, which meets the requirements of. By introducing a specific amount of barrel distortion in the lens, the image height of the f theta lens is proportional to the scanning angle.
These lenses which have a larger scan fielddue to distortion are indicated with. Besides, f theta lenses has been widely used in many other fields with high precision, such as biochip and missile tracking. With the development of dwdm system, compact spectrometer and various grating based devices, the interest in solving optical problems with innovative optical design has been a revival. Optical design and performance of f theta lenses for highpower and highprecision applications. F theta lenses are plane field objectives, which are commonly used in combination with xy galvanometer scanner. This book holds a unique place in the optics literature. The diffractionlimited, multipleelement, airspaced lens design is optimized for a flat field in the image plane and low ftheta distortion. This lens focuses a laser beam scanned with a scanner, etc. The enabling key component, f theta lenses, is designed as micrometer focusing scanning lens. The ecops is used for a 1 khz axial scan and a transverse scan is performed using beam steering. Customized and standardized objective lenses from jenoptik the perfect optics solution jenoptik offers customized and standardized objective lenses or optics, adapted precisely to your diverse and highly complex applications helping you to secure sustainable success. Jay kumler, president of jenoptik optical systems jay.