After installing the lens, the ring can be pressed into place or (preferably) the ring shrunk by cooling and inserted into a cell expanded by heating. The outside diameter (OD) of the ring is made slightly oversize with respect to the inside diameter (ID) of the cell. Interference-Fit Ring A lens can be held against a shoulder or spacer in a cell by an axial force exerted against the lens near its rim by a continuous ring as shown in Figure 6.2. This type of mount also offers some protection against shock and vibration.įIGURE 6.1 Typical configuration of a spring-mounted lens element. Free circulation of air around the lens is allowed. Symmetry of the cantilevered springs tends to keep the lens centered. Three flat springs spaced at 120° intervals around the lens rim are shaped to interface with that rim. Spring Suspension In applications involving large temperature changes with loose centration, tilt, and/or axial positioning tolerances, lenses might be supported by springs.1,2 One such mounting, typically used to support condenser lenses or filters made of heat-absorbing glass in projector illuminators, is illustrated in Figure 6.1. For simplicity, it is assumed in most cases that the lenses are glass and the mount is a simple, cylindrical metal cell. Although the examples show single lens elements, some of these concepts are applicable to multiple element designs. In each case, the parts are premachined to specified dimensions and assembled without adjustment. Principles of optomechanical design and material selection intended to minimize the adverse effects of these imposed forces while retaining component function, location, and alignment are explained.Ħ.2 Mounting Lenses Low Precision Mounts In this section, configurations for relatively low cost, low precision mounts for lenses are considered. Analytical relationships are given for estimating selected important attributes of the designs such as contact stress due to forces imposed during assembly or due to temperature changes or acceleration. Numerous examples from the literature illustrate these techniques. Single-Point Diamond-Turned Mirrors and MountsĦ.1 Introduction and Summary A variety of common techniques for mounting optical components such as individual and multiple lenses, windows, domes, filters, small mirrors, and prisms are discussed here.Examples of Simple Window and Filter Mounts.Mounts for Windows, Filters, Shells, and Domes General Considerations Axial Stress at Multiple Element Interfaces.Axial Stress at Single Element Interfaces.Introduction and Summary Mounting Lenses Low Precision Mounts Optical Mounts: Lenses, Windows, Small Mirrors, and Prisms Paul R. Anees Ahmad Boca Raton: CRC Press LLC, 1999 “Optical Mounts: Lenses, Windows, Small Mirrors, and Prisms” Optomechanical Engineering Handbook Ed. ![]() Using thefrench equivalent of absoption costing with under over recovery.
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