Adhesive mounting of lenses can allow flexible position control of each optical element, low stress, low part count, and precise alignment of lens assemblies in addition to high durability with respect to thermal expansion, shock, and vibration. Historic implementations of this method carried risk of UV degradation, photo contamination, long term stability, and long assembly cycle times. Others have developed non-adhesive friction/contact approaches to mount lenses but with significant compromises in durability and product cost. These two methods are compared and an optimal approach to achieve high lens mounting durability, low cycle time and negligible photo-contamination is demonstrated. Durability of this adhesive mounting solution will be established with examples including shock and vibration, mechanical stress decoupling factors, and optical stability over a wide range of shipping temperatures.
An overview of a high performance zoom camera will be presented. Performance achievements including zoom
(magnification range), mass, bore sight, space envelope and environment will be discussed. Optical mounting
techniques and flexural decoupling of components for large temperature ranges will be presented. Precision trajectory
and positioning of multiple moving lens groups will be reviewed and lead screw decoupling methods providing axial
stiffness with radial compliance will be illustrated. A mechanical system interface with high stiffness and thermal
compliance for azimuth and elevation adjustments will be given. Finally, the paper will conclude with a review of
lessons learned, including lead screw decoupling and aligning multiple static and moving lens groups.
Optical systems often require compensation during operation to accommodate environmental and
process changes. Compensation usually involves the movement of a lens element insitu. Different optomechanical
designs are used to in order to meet the volume, optical and environmental systems requirements
on a case by case basis. Two opto-mechanical designs are presented and compared. The performance and service requirements dictate the methodology used, including component design, flexure construction, actuation and control system. Included will be design constraints, prototype testing, manufacturing issues and implementation problems.
This paper will discuss how mechanical and optical analysis software can be used together
to optimize an opto-mechanical structure subjected to vibrational loading. Mechanical
analysis software output is post processed into Zernike polynomial coefficients and rigid
body motions for analysis with optical modeling software. Structural modifications can then
be implemented to improve optical performance.
A Cassegrain telescope, which can be utilized for laser radar applications, will be used to
demonstrate this optimization. Two FEA solution methods are compared. Based on the
deformation results of the FEA, Zernike polynomials and rigid body motions are generated
and applied to the optical surfaces in CODE V®. The effect of these deformations on
wavefront can then be computed and compared to a required performance.