Post on 04-Apr-2018
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ISO Optical drawing standards
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Objectives
Awareness of international drawing standards
Awareness of specific optical drawing standards
Features unique to optical drawings
Using standards as a check list for requirements
Awareness of a standard format for optical
drawings of components and systems
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Overview
Intro to ISO Mechanical drawing standards
Symbols used on drawings and meanings
Methods of verification of tolerances on drawings ISO 10110, Part 1 Preparation of optical drawings
Unique features of optical drawings and layouts
Specifics of optical element drawings
Default tolerances for element drawings
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ISO Mechanical drawing standards
ISO 1101 Drawings Geometrical tolerancing
Covers all non-optical aspects of drawings
Datums related to kinematic design
Symbols used for feature tolerances
Tolerance frames and zones
Theoretically exact dimensions
Maximum material condition
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Datums - like kinematics
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Tolerance zone symbols
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Tolerance zone symbols - 2
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Tolerance frames and zones
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ISO Mechanical drawing standards - 2
ISO 5460 Geometrical tolerancing
Deals with the verification of dimensions
Meaning of a tolerance zone Realizations of planes, lines & points as datums
Ordering of datums for measurements
Methods of measuring feature characteristics
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Establishing datums for measurement
It is ok to use shims to stabilize the part being measured
Using shims changes the righthand case into the lefthand case
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Establishing datums - points
A sphere is a physical realization of a point which is an idealization
Properties of a sphere let you infer where the point (center) is in space
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Establishing datums - lines
The cylindrical mandrel is a realization of a line, the axis of the cylinder
The OD of the tube can be measured relative to the cylindrical mandrel
As an example
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Establishing datums - axes
Use of external features to establish an axis
A good (air bearing) rotary table is an excellent way of establishing an axis
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Order of using datums
Use the primary (A) datum first unless datums reversed in tolerance frame
Apparent hole location will vary with choice of primary datum
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Verification of straightness
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Verification of flatness
An optical example in a mechanical standard!
Many mechanical methods are also shown including using an autocollimator
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Verification of a profile
Use of a template, something used in optical fabrication
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ISO 10110 Optical DrawingsPart 1 - General
Covers features on drawings unique to optics
Optical axis line types
Hatching
Leaders dot end to regions
Arrowhead to edges
Clear apertures (effective) Test regions
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Dimensioning radius of curvature
Head of arrow points away from center of curvature, always
Helps identify CC or CX when surfaces are near plane
The entire radius tolerance can be incorporated in the dimension
There are other ways of tolerancing radius, but this way is valid
R designates a plane surface, the tolerance is specified using Part 5
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Other optics specific details
Center thickness is indicated as shown
For meniscus lenses the total thickness should
be shown as well in parenthesis
Diameters should be indicated along with the
tolerance as shownClear aperture is indicated with the e
Bevels are functional and fully dimensioned
Chamfers are protective, given by face width
Sharp edges as in prism vertices are indicated
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Prisms dimensions and angles
Prisms with small or protective chamfersare dimensioned to theoretical sharp
edges, make clear by adding theor.
Surfaces are identified by Roman letters
Angles indicated and toleranced
Angles between faces and E are
pyramidal errors
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Optical element drawing per ISO
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Sub-assemblies
Include parts numbers of separate elementsIndicate materials (cement) used in assembly
Dimensions or tolerances specific to sub-assembly
Other requirements for sub-assembly (focal length)
The 4/1 is a centering tolerance relative to datumsCenter thickness applies to sub-assembly
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Optical layouts or assembly drawings
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Special indications on layouts
Image position
Pupil position
Image position with field stop
Pupil position with physical aperture
Image location and size, no aperture
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Class example system layout
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Zemax ISO element format
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Default tolerances