1、BRITISH STANDARD BS ISO 10110-4:1997 Optics and optical instruments Preparation of drawings for optical elements and systems Part 4: Material imperfections Inhomogeneity and striae ICS 37.020BSISO10110-4:1997 This British Standard, having been prepared under the directionof the Consumer Products and
2、 Services Sector Board, was published under theauthority of the Standards Board and comes into effect on 15November1997 BSI 04-2000 ISBN 0 580 28769 6 National foreword This British Standard reproduces verbatim ISO10110-4:1997and implements it as the UK national standard. The UK participation in its
3、 preparation was entrusted to Technical Committee CPW/172, Optics and optical instruments, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK
4、interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications
5、referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions o
6、f a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, page
7、s ii to iv, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO10110-4:1997 BSI 04-2000 i
8、Contents Page National foreword Inside front cover Foreword iii Text of ISO 10110-4 1ii blankBSISO10110-4:1997 ii BSI 04-2000 Contents Page Foreword iii 1 Scope 1 2 Definitions 1 3 Specification 1 4 Indication in drawings 1 Annex A (informative) Bibliography 3 Figure 1 Example of inhomogeneity and s
9、triae tolerance indication 2 Table 1 Inhomogeneity classes 1 Table 2 Classes of striae 1 Descriptors: Optics, optical equipment, drawings, technical drawings, presentation, imperfections, refractive index.BSISO10110-4:1997 BSI 04-2000 iii Foreword ISO (the International Organization for Standardizat
10、ion) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be r
11、epresented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Sta
12、ndards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO10110-4was prepared by Technical Committee ISO/TC 172, Optics and optica
13、l instruments, Subcommittee SC 1, Fundamental standards. ISO10110consists of the following parts, under the general title Optics and optical instruments Preparation of drawings for optical elements and systems: Part 1: General; Part 2: Material imperfections Stress birefringence; Part 3: Material im
14、perfections Bubbles and inclusions; Part 4: Material imperfections Inhomogeneity and striae; Part 5: Surface form tolerances; Part 6: Centring tolerances; Part 7: Surface imperfection tolerances; Part 8: Surface texture; Part 9: Surface treatment and coating; Part 10: Table representing data of a le
15、ns element; Part 11: Non-toleranced data; Part 12: Aspheric surfaces; Part 13: Laser irradiation damage threshold. Annex A of this part of ISO10110is for information only.iv blankBSISO10110-4:1997 BSI 04-2000 1 1 Scope ISO10110specifies the presentation of design and functional requirements for opti
16、cal elements in technical drawings used for manufacturing and inspection. This part of ISO10110specifies rules for the indication of allowable inhomogeneity and striae in optical elements. 2 Definitions For the purposes of this part of ISO 10110, the following definitions apply. 2.1 inhomogeneity gr
17、adual variation of the refractive index within an optical element, defined as the difference between maximum and minimum values of the refractive index within the element NOTEInhomogeneity is caused by a variation of the chemical composition and other effects within the bulk material. 2.2 striae inh
18、omogeneities having small spatial extent NOTEStriae can appear in the form of sharply defined cordlike regions, especially when the glass was made by the clay-pot melting process. The tank melting process, which can cause band-like striae structures, is more common today for production of optical gl
19、ass. 3 Specification 3.1 Classes of inhomogeneity Measurement of the inhomogeneity within an optical element is often difficult to carry out in a nondestructive manner. Therefore the specification of an inhomogeneity class for an optical element is primarily useful for the selection of the raw mater
20、ial. For characterization of inhomogeneity, six classes are defined. They correspond to the allowable variation of refractive index within the optical element. The values are fixed by Table 1. Table 1 Inhomogeneity classes 3.2 Classes of striae In contrast to inhomogeneity, striae within a finished
21、part can be easily observed. Therefore the specification of the striae class for an optical element serves not only the selection of the raw material, but also allows the checking of the degree of compliance of the finished part with the specification. For the purpose of this part of ISO 10110, stri
22、ae are divided into five quality classes. For classes1to 4, striae are considered only if they cause an optical path difference %s of at least30nm. Under this provision striae can be tested and classified by their projected area perpendicular to the optical path through the element. Class5allows als
23、o the specification of tolerances for striae causing an optical path difference of less than30nm. Classes1to4are related to the density of striae, which is defined as the ratio of effective projected area of striae to the area of the test region. The values are fixed by Table 2. Class5applies to opt
24、ical elements with highest quality requirements. The restriction to striae exceeding30nm optical path difference does not apply to this class. It is to be noted that for very weak striae the specification of a maximum density is not useful. Striae causing an optical path difference %s 150nm are usua
25、lly not to be expected in optical glasses and filter glasses. Table 2 Classes of striae 4 Indication in drawings These material imperfections are indicated in drawings by a code number, followed by a slash, and the class numbers for inhomogeneity and striae. 4.1 Code number The code number for inhom
26、ogeneity and striae is 2. Class Maximum permissible variation of refractive index within a part 10 6 0 50 1 20 2 5 3 2 4 1 5 0,5 Class Density of striae causing an optical pathdifference of at least 30 nm in% 1 u 10 2 u 5 3 u 2 4 u 1 5 Extremely free of striae Restriction to striae exceeding 30 nm d
27、oes not apply Further information to be supplied in a note to the drawingBSISO10110-4:1997 2 BSI 04-2000 4.2 Structure of indication The indication shall read as follows: 2/A; B where A is the class number for inhomogeneity according to Table 1 and B is the class number for striae according to Table
28、 2. If no specification for inhomogeneity is needed, A shall be replaced by a dash. If no specification for striae is needed, B shall be replaced by a dash. 4.3 Location The indication shall be entered near the optical element to which it refers. If necessary, the indication may be connected to the
29、element by a leader. Preferably, it should be associated with the other indications of material imperfections (stress birefringence and bubbles, see ISO 10110-2 and ISO10110-3). Examples of such an indication are given in 4.4 and in ISO 10110-1:1996, Annex A. Alternatively, for lens elements, the in
30、dication may be given in a table in accordance with ISO 10110-10. 4.4 Example of indication Figure 1 shows, as an example, an optical element of inhomogeneity class 3, striae class 2. Figure 1 Example of inhomogeneity andstriae tolerance indicationBSISO10110-4:1997 BSI 04-2000 3 Annex A (informative
31、) Bibliography 1 ISO 10110-1:1996, Optics and optical instruments Preparation of drawings for optical elements and systems Part 1: General. 2 ISO 10110-2:1996, Optics and optical instruments Preparation of drawings for optical elements and systems Part 2: Material imperfections Stress birefringence.
32、 3 ISO 10110-3:1996, Optics and optical instruments Preparation of drawings for optical elements and systems Part 3: Material imperfections Bubbles and inclusions. 4 ISO 10110-10:1996, Optics and optical instruments Preparation of drawings for optical elements and systems Part 10: Table representing
33、 data of lens element.BS ISO 10110-4:1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Roya
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