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12 ISO Optical Drawing Standards

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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


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