GB1307371A - Optical means for comparing supposedly identical objects and articles - Google Patents

Optical means for comparing supposedly identical objects and articles

Info

Publication number
GB1307371A
GB1307371A GB1307371DA GB1307371A GB 1307371 A GB1307371 A GB 1307371A GB 1307371D A GB1307371D A GB 1307371DA GB 1307371 A GB1307371 A GB 1307371A
Authority
GB
United Kingdom
Prior art keywords
shutter
articles
comparing
viewing
incorporates
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitchinson I H
Williams I Williamson F A
Original Assignee
Hitchinson I H
Williams I Williamson F A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitchinson I H, Williams I Williamson F A filed Critical Hitchinson I H
Publication of GB1307371A publication Critical patent/GB1307371A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/956—Inspecting patterns on the surface of objects
    • G01N21/95607—Inspecting patterns on the surface of objects using a comparative method

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Telescopes (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

1307371 Optical comparison device I WILLIAMS F A WILLIAMSON and I H HITCHINSON 21 May 1970 [31 May 1969] 27705/69 Heading G2J A binocular viewing device for comparing supposedly identical articles X, Y placed sideby-side, whereby they are seen as a single superimposed image, incorporates a circular rotary shutter 30 which alternately obscures the view through each viewing aperture 22, 23 of the device. Images of the articles X, Y reach the eyes R, L of a viewer by way of planar reflectors 26, 24 and 27, 25. The shutter 30 is mounted on the shaft 32 of a variable speed electric motor 33 and incorporates three uniformly spaced apertures 31 of such size and arrangement that appropriate positioning of the shutter 30 affords a simultaneous view through the viewing apertures for accurate location of the articles on base 10. When the articles are correctly positioned they are viewed through 22 and 23 as a composite image, rotation of the shutter causing any differences between X and Y to give rise to a "blinking" effect at the frequency of rotation of the shutter; the speed of the shutter can be prearranged so that the "blink" is outstandingly noticeable to the particular user of the device. The shutter arrangement may be replaced by an intermittent light source or sources. In an alternative embodiment Fig.4, (not shown), the device is made in spectacle form with a nose piece (40 and sidearms (41). In this case there is provided a pivotal shutter (43) which is rocked by a spring powered motor (45) and which has side pieces (43a, 43b) which can be interposed between the reflector pairs 26, 24 and 27, 25.
GB1307371D 1969-05-31 1969-05-31 Optical means for comparing supposedly identical objects and articles Expired GB1307371A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2770569 1969-05-31

Publications (1)

Publication Number Publication Date
GB1307371A true GB1307371A (en) 1973-02-21

Family

ID=10263964

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1307371D Expired GB1307371A (en) 1969-05-31 1969-05-31 Optical means for comparing supposedly identical objects and articles

Country Status (1)

Country Link
GB (1) GB1307371A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161908A2 (en) * 1984-05-09 1985-11-21 Kyodo Printing Co., Ltd. System for detecting difference between image on primary sheet and image on secondary sheet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161908A2 (en) * 1984-05-09 1985-11-21 Kyodo Printing Co., Ltd. System for detecting difference between image on primary sheet and image on secondary sheet
EP0161908A3 (en) * 1984-05-09 1987-11-25 Kyodo Printing Co., Ltd. System for detecting difference between image on primary sheet and image on secondary sheet

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees