WO1994006048A1 - Optical magnifying apparatus - Google Patents

Optical magnifying apparatus Download PDF

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Publication number
WO1994006048A1
WO1994006048A1 PCT/GB1993/000942 GB9300942W WO9406048A1 WO 1994006048 A1 WO1994006048 A1 WO 1994006048A1 GB 9300942 W GB9300942 W GB 9300942W WO 9406048 A1 WO9406048 A1 WO 9406048A1
Authority
WO
WIPO (PCT)
Prior art keywords
mirror
observer
mirrors
optical
light
Prior art date
Application number
PCT/GB1993/000942
Other languages
French (fr)
Inventor
Robin John Freeman
Original Assignee
Vision Engineering Limited
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 Vision Engineering Limited filed Critical Vision Engineering Limited
Priority to DE69306372T priority Critical patent/DE69306372T2/en
Priority to US08/211,418 priority patent/US5477385A/en
Priority to EP93910163A priority patent/EP0610454B1/en
Priority to KR1019940700986A priority patent/KR0147414B1/en
Priority to JP6506941A priority patent/JP2548524B2/en
Publication of WO1994006048A1 publication Critical patent/WO1994006048A1/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/18—Arrangements with more than one light path, e.g. for comparing two specimens
    • G02B21/20—Binocular arrangements
    • G02B21/22—Stereoscopic arrangements

Definitions

  • This invention relates to optical magnifying apparatus for producing a magnified image of an object for viewing by an observer and in particular to such apparatus for producing a magnified binocular or stereoscopic image of an object.
  • While known single lens magnifiers are capable of providing low magnification factors, for example up to 2x of an object, such magnifiers are not capable of providing higher magnification factors, for example in the range 4x to lOx.
  • the exit pupil diameters provided by such single lens magnifiers are small and consequently restrict the position of the eyes of an observer from which the magnified image may be viewed.
  • the relationship of the magnified image to the angle of view by each eye tends to be incorrect and confuses the observer.
  • optical magnification apparatus comprises an object lens to receive light from an object to be viewed; beam splitting means to receive light emergent from said object lens and to direct a first portion of said emergent light to a first optical element and to direct a second portion of said emergent light to a second optical element; said first optical element including a first mirror and said second optical element including a second mirror; said first and second optical elements being so located that focussed first and second images of the object being viewed are produced by the object lens on said first and second mirrors respectively; and a viewing lens located to receive light constituting said first and second images and reflected by said first and second mirrors to produce magnified images of said object for perception by the eyes of an observer.
  • the beam splitting mirror 12 preferably comprises a half silvered planar mirror. A proportion of the light from the objective lens 11 passes through the beam splitting mirror and falls on a first concave mirror 13.
  • the mirror 13 is located at a distance from the objective lens 11, in relation to the focal length of the objective lens 11, such that a focussed first image 14 of the object 10 is produced on the surface of the mirror 13. Light received by the mirror 13 is reflected back to the beam splitting mirror 12 where it is reflected and directed through a viewing lens 15 to one eye 16 of an observer.
  • the remainder of the light from the objective lens 11 is reflected by the beam splitting mirror 12 to a second concave mirror 17 and a second focussed image 18 of the object 10 is produced on the surface of the mirror 17.
  • Light received by the second concave mirror 17 is reflected back to pass through the beam splitting mirror 12 and thence through the viewing lens 15 to a second eye 19 of the observer.
  • the curvature of the concave mirrors is such that the mirrors in combination with the viewing lens 15 produce, at the observer's eyes, images of the backstop of the objective lens 11.
  • the optical axes of the concave mirrors 13 and 17 are orientated to be aligned with the optical axes of light incident thereon, the light reflected by the mirrors 13 and 17 after respective reflection by and passage through the beam splitting mirror will be aligned and will produce a single image of the object. Accordingly in order to produce images displaced from one another for viewing by the two eyes respectively of the observer, the optical axes of the mirrors 13, 17 are relatively offset such that the two relayed pupils of the mirrors 13 and 17 are separated horizontally by a distance approximately equal to the average interpupillary spacing of an observer. If desired means may be provided to vary the relative inclination of the optical axes of the mirrors 13, 17 to enable adjustment of the spacing of the relayed pupils of the mirrors to match the interpupillary spacing of the observer.
  • the spacing of the pupils of the mirrors 13, 17 matches precisely the interpupillary spacing of the observer, the observer will perceive a binocular but not stereoscopic magnified image of the object 10. If it is desired to produce images which are perceived as a stereoscopic magnified view of the object 10 the optical axes of the mirrors 13, 17 are orientated relative to one another such that a small mismatch occurs between the spacing of the relayed pupil centres of the mirrors 13, 17 and the interpupillary spacing of the observer. With such a mismatch between the spacing of the relayed pupil centres and the interpupillary spacing of the observer the angle of view subtended from the object and perceived by each eye will be different thus providing the parallax required for stereoscopic viewing of the object 10. If desired the relative orientation of the optical axes of the concave mirrors may be such that the spacing of the relayed pupils of the mirrors causes the observer to perceive an inverse stereoscopic image of the object.
  • the images 14, 18 produced by the object lens 11 on the mirrors 13, 17 respectively are inverted and hence in order that the images perceived by the observer have the same orientation as the object an image inverting module 20 is located in the light path of the light between the object lens 11 and the beam splitting mirror 12.
  • concave mirrors 13 and 17 are provided and the images 13 and 18 are produced thereon to be perceived by an observer by means of the viewing lens 15.
  • the concave mirrors 13, 17 may be replaced by positive lens elements in combination with mirrors.

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microscoopes, Condenser (AREA)
  • Lenses (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Glass Compositions (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Optical magnifying apparatus comprises an objective lens (11) from which light is directed to a beam splitting mirror (12). A portion of the light passes through the beam splitting mirror to a first concave mirror (13) and is reflected back via the beam splitting mirror through a viewing lens (5) to a first eye (16) of an observer. The remainder of the light is reflected by the beam splitting mirror to a second concave mirror (17) from which it is reflected back via the beam splitting mirror through the viewing lens to a second eye (19) of the observer. Focussed first and second images (14, 18) of an object (10) are produced respectively on the surfaces of the first and second concave mirrors. The optical axes of the concave mirrors are relatively offset such that the relayed pupils of the mirrors are separated horizontally by a distance approximately equal to the average interpupilary spacing of an observer. The relative inclination of the optical axes of the concave mirrors may be adjustable to enable non-stereoscopic or stereoscopic images of the object to be observed.

Description

OPTICAL MAGNIFYING APPARATUS
This invention relates to optical magnifying apparatus for producing a magnified image of an object for viewing by an observer and in particular to such apparatus for producing a magnified binocular or stereoscopic image of an object.
While known single lens magnifiers are capable of providing low magnification factors, for example up to 2x of an object, such magnifiers are not capable of providing higher magnification factors, for example in the range 4x to lOx. Furthermore the exit pupil diameters provided by such single lens magnifiers are small and consequently restrict the position of the eyes of an observer from which the magnified image may be viewed. Also when it is desired to view the magnified image of the object stereoscopically with both eyes the relationship of the magnified image to the angle of view by each eye tends to be incorrect and confuses the observer.
According to the invention optical magnification apparatus comprises an object lens to receive light from an object to be viewed; beam splitting means to receive light emergent from said object lens and to direct a first portion of said emergent light to a first optical element and to direct a second portion of said emergent light to a second optical element; said first optical element including a first mirror and said second optical element including a second mirror; said first and second optical elements being so located that focussed first and second images of the object being viewed are produced by the object lens on said first and second mirrors respectively; and a viewing lens located to receive light constituting said first and second images and reflected by said first and second mirrors to produce magnified images of said object for perception by the eyes of an observer. An embodiment of the invention will now be described by way of example with reference to the drawing which is a perspective view of the optical elements of optical magnifying apparatus in accordance with the invention.
Referring to the drawing, light from an object 10 is collected by an objective lens 11 and is directed to a beam splitting mirror 12. The beam splitting mirror 12 preferably comprises a half silvered planar mirror. A proportion of the light from the objective lens 11 passes through the beam splitting mirror and falls on a first concave mirror 13. The mirror 13 is located at a distance from the objective lens 11, in relation to the focal length of the objective lens 11, such that a focussed first image 14 of the object 10 is produced on the surface of the mirror 13. Light received by the mirror 13 is reflected back to the beam splitting mirror 12 where it is reflected and directed through a viewing lens 15 to one eye 16 of an observer. The remainder of the light from the objective lens 11 is reflected by the beam splitting mirror 12 to a second concave mirror 17 and a second focussed image 18 of the object 10 is produced on the surface of the mirror 17. Light received by the second concave mirror 17 is reflected back to pass through the beam splitting mirror 12 and thence through the viewing lens 15 to a second eye 19 of the observer. The curvature of the concave mirrors is such that the mirrors in combination with the viewing lens 15 produce, at the observer's eyes, images of the backstop of the objective lens 11.
It will be appreciated that if the optical axes of the concave mirrors 13 and 17 are orientated to be aligned with the optical axes of light incident thereon, the light reflected by the mirrors 13 and 17 after respective reflection by and passage through the beam splitting mirror will be aligned and will produce a single image of the object. Accordingly in order to produce images displaced from one another for viewing by the two eyes respectively of the observer, the optical axes of the mirrors 13, 17 are relatively offset such that the two relayed pupils of the mirrors 13 and 17 are separated horizontally by a distance approximately equal to the average interpupillary spacing of an observer. If desired means may be provided to vary the relative inclination of the optical axes of the mirrors 13, 17 to enable adjustment of the spacing of the relayed pupils of the mirrors to match the interpupillary spacing of the observer.
If the spacing of the pupils of the mirrors 13, 17 matches precisely the interpupillary spacing of the observer, the observer will perceive a binocular but not stereoscopic magnified image of the object 10. If it is desired to produce images which are perceived as a stereoscopic magnified view of the object 10 the optical axes of the mirrors 13, 17 are orientated relative to one another such that a small mismatch occurs between the spacing of the relayed pupil centres of the mirrors 13, 17 and the interpupillary spacing of the observer. With such a mismatch between the spacing of the relayed pupil centres and the interpupillary spacing of the observer the angle of view subtended from the object and perceived by each eye will be different thus providing the parallax required for stereoscopic viewing of the object 10. If desired the relative orientation of the optical axes of the concave mirrors may be such that the spacing of the relayed pupils of the mirrors causes the observer to perceive an inverse stereoscopic image of the object.
The images 14, 18 produced by the object lens 11 on the mirrors 13, 17 respectively are inverted and hence in order that the images perceived by the observer have the same orientation as the object an image inverting module 20 is located in the light path of the light between the object lens 11 and the beam splitting mirror 12.
In the embodiment described hereinbefore, concave mirrors 13 and 17 are provided and the images 13 and 18 are produced thereon to be perceived by an observer by means of the viewing lens 15. However if desired the concave mirrors 13, 17 may be replaced by positive lens elements in combination with mirrors.

Claims

1. Optical magnification apparatus including an object lens (11) to receive light from an object (10) to be viewed characterised by beam splitting means (12) to receive light emergent from said object lens (11) and to direct a first portion of said emergent light to a first optical element (13) and to direct a second portion of said emergent light to a second optical element (17); said first optical element including a first mirror and said second optical element including a second mirror; said first and second optical elements being so located that focussed first and second images (14, 18) of the object (10) being viewed are produced by the object lens (11) on said first and second mirrors respectively; and a viewing lens (5) located to receive light constituting said first and second images and reflected by said first and second mirrors to produce magnified images of said object for perception by the eyes (16, 19) of an observer.
2. Optical magnification apparatus as claimed in claim 1 further characterised in that said beam splitting means (12) comprises a half silvered planar mirror.
3. Optical magnification apparatus as claimed in claim 1 or 2 further characterised in that the first and second optical elements (13, 17) comprise first and second concave mirrors respectively.
4. Optical magnification apparatus as claimed in claim 2 or 3 further characterised in that the first mirror (13) is located to receive light from the object lens (11) passing through the half silvered beam splitting mirror (12) and is orientated such that light from the first image (14) is reflected back to the half silvered mirror (12) and is reflected by the half silvered mirror to the viewing lens (5) and the second mirror (17) is located to receive light from said object lens (11) reflected by said half silvered mirror (12) and is orientated such that light from the second image (18) is reflected back to the half silvered mirror and passes through the half silvered mirror to said viewing lens (5).
5. Optical magnification apparatus as claimed in any preceding claim further characterised in that the first and second mirrors (13, 17) are angularly orientated relative to one another such that centres of relayed pupils of said first and second mirrors are spaced apart in a direction corresponding to interpupillary spacing of an observer's eyes (16, 19).
6. Optical magnification apparatus as claimed in claim 5 further characterised in that the spacing of the relayed pupils matches the interpupillary spacing of the eyes of the observer so that the observer perceives a non- stereoscopic image.
7. Optical magnification apparatus as claimed in claim 5 further characterised in that the spacing of the relayed pupils differs from the interpupillary spacing of the eyes of the observer so that the observer perceives a stereoscopic image.
8. Optical magnification apparatus as claimed in any one of claims 5, 6 or 7 further characterised by the provision of means to vary the relative angular orientation of the first and second mirrors (13, 17).
PCT/GB1993/000942 1992-09-03 1993-05-07 Optical magnifying apparatus WO1994006048A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69306372T DE69306372T2 (en) 1992-09-03 1993-05-07 OPTICAL IMAGE-ENLARGING DEVICE
US08/211,418 US5477385A (en) 1992-09-03 1993-05-07 Optical magnifying apparatus
EP93910163A EP0610454B1 (en) 1992-09-03 1993-05-07 Optical magnifying apparatus
KR1019940700986A KR0147414B1 (en) 1992-09-03 1993-05-07 Optical magnifying apparatus
JP6506941A JP2548524B2 (en) 1992-09-03 1993-05-07 Optical magnifying device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9218628.7 1992-09-03
GB929218628A GB9218628D0 (en) 1992-09-03 1992-09-03 Optical magnifying apparatus

Publications (1)

Publication Number Publication Date
WO1994006048A1 true WO1994006048A1 (en) 1994-03-17

Family

ID=10721321

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000942 WO1994006048A1 (en) 1992-09-03 1993-05-07 Optical magnifying apparatus

Country Status (13)

Country Link
US (1) US5477385A (en)
EP (1) EP0610454B1 (en)
JP (1) JP2548524B2 (en)
KR (1) KR0147414B1 (en)
AT (1) ATE145993T1 (en)
CA (1) CA2120146C (en)
DE (1) DE69306372T2 (en)
DK (1) DK0610454T3 (en)
ES (1) ES2098743T3 (en)
GB (1) GB9218628D0 (en)
MY (1) MY109094A (en)
TW (1) TW227605B (en)
WO (1) WO1994006048A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2718941A1 (en) * 1994-04-26 1995-10-27 Menhem Gaby Optical simulator for movements involved in abdominal surgery
WO1998037450A1 (en) * 1997-02-19 1998-08-27 Central Research Laboratories Limited Apparatus for displaying an image suspended in space
GB2519062A (en) * 2013-08-15 2015-04-15 Vision Eng Viewer with enhanced depth perception
US10379332B2 (en) 2014-11-17 2019-08-13 Vision Engineering Limited Stereoscopic viewing apparatus

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US5406415A (en) * 1992-09-22 1995-04-11 Kelly; Shawn L. Imaging system for a head-mounted display
DE69422803T2 (en) * 1993-03-03 2000-06-15 Graham Stewart B. Street Image orientation and device
HU212134B (en) * 1993-07-27 1998-06-29 László Holakovszky Picture displaying device supported on the head preferably for displaying tv pictures
US5684497A (en) 1994-12-21 1997-11-04 Siliscape, Inc. Twice folded compound magnified virtual image electronic display
US5644323A (en) * 1994-12-21 1997-07-01 Siliscape, Inc. Miniature synthesized virtual image electronic display
US5936774A (en) * 1995-08-29 1999-08-10 Street; Graham S. B. Autostereoscopic display
US5847879A (en) * 1997-02-26 1998-12-08 Raytheon Company Dual wavelength wide angle large reflective unobscured system
US6262841B1 (en) 1997-11-24 2001-07-17 Bruce D. Dike Apparatus for projecting a real image in space
US6286962B1 (en) 1998-12-23 2001-09-11 Thomas Hennes, Inc. Beamsplitter optical projection system
SE519057C2 (en) * 2001-05-10 2003-01-07 Totalfoersvarets Forskningsins Presentation device with variable focusing depth
US6724539B2 (en) * 2001-11-02 2004-04-20 Sumitomo Electric Industries, Ltd. Interleaver
US6511182B1 (en) * 2001-11-13 2003-01-28 Eastman Kodak Company Autostereoscopic optical apparatus using a scanned linear image source
US6886940B2 (en) * 2003-08-28 2005-05-03 Eastman Kodak Company Autostereoscopic display for multiple viewers
US6871956B1 (en) * 2003-09-12 2005-03-29 Eastman Kodak Company Autostereoscopic optical apparatus
US7242524B2 (en) * 2003-11-25 2007-07-10 Pc Mirage, Llc Optical system for forming a real image in space
US7226167B2 (en) * 2004-05-25 2007-06-05 Eastman Kodak Company Autostereoscopic display apparatus
US20080018860A1 (en) * 2006-07-21 2008-01-24 Thomas Hennes System and method for 3D optical projection
TWI323090B (en) 2006-07-28 2010-04-01 Au Optronics Corp Electronic devices having reflecting portions to reflect optical signals to receiving portions thereof
DE102018209886B4 (en) * 2018-06-19 2020-02-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device for projecting a laser beam to generate an image on the retina of an eye and glasses device with two such devices

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US3914030A (en) * 1971-04-12 1975-10-21 Helmut Weiss Virtual image magnifier system filled with a refractive medium
EP0076344A1 (en) * 1981-10-02 1983-04-13 Stephen Gibson Stereoscopic apparatus and method of using same
US4799763A (en) * 1987-03-27 1989-01-24 Canaby Technologies Corporation Paraxial stereoscopic projection system
US4840455A (en) * 1985-03-20 1989-06-20 Paul Stuart Kempf And Pilar Moreno Family Trust 3-dimensional optical viewing system
US5144476A (en) * 1989-04-24 1992-09-01 Kebo Reynold S All-reflective zoom optical system

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US4093347A (en) * 1976-05-10 1978-06-06 Farrand Optical Co., Inc. Optical simulation apparatus using controllable real-life element
US4859031A (en) * 1987-08-03 1989-08-22 Kaiser Electronics Optical collimating apparatus
US4896952A (en) * 1988-04-22 1990-01-30 International Business Machines Corporation Thin film beamsplitter optical element for use in an image-forming lens system
US5189452A (en) * 1991-12-09 1993-02-23 General Electric Company Real image projection system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914030A (en) * 1971-04-12 1975-10-21 Helmut Weiss Virtual image magnifier system filled with a refractive medium
EP0076344A1 (en) * 1981-10-02 1983-04-13 Stephen Gibson Stereoscopic apparatus and method of using same
US4840455A (en) * 1985-03-20 1989-06-20 Paul Stuart Kempf And Pilar Moreno Family Trust 3-dimensional optical viewing system
US4799763A (en) * 1987-03-27 1989-01-24 Canaby Technologies Corporation Paraxial stereoscopic projection system
US5144476A (en) * 1989-04-24 1992-09-01 Kebo Reynold S All-reflective zoom optical system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2718941A1 (en) * 1994-04-26 1995-10-27 Menhem Gaby Optical simulator for movements involved in abdominal surgery
WO1998037450A1 (en) * 1997-02-19 1998-08-27 Central Research Laboratories Limited Apparatus for displaying an image suspended in space
GB2519062A (en) * 2013-08-15 2015-04-15 Vision Eng Viewer with enhanced depth perception
GB2519062B (en) * 2013-08-15 2015-12-09 Vision Eng Viewer with enhanced depth perception
KR20160072097A (en) * 2013-08-15 2016-06-22 비존 엔지니어링 리미티드 Viewer with enhanced depth perception
CN105723269A (en) * 2013-08-15 2016-06-29 视界工程有限公司 Viewer with enhanced depth perception
CN105723269B (en) * 2013-08-15 2017-12-15 视界工程有限公司 The viewer of depth perception with enhancing
RU2642920C2 (en) * 2013-08-15 2018-01-29 Вижн Инжиниринг Лимитед Device for observation with improved depth perception
US10082674B2 (en) 2013-08-15 2018-09-25 Vision Engineering Limited Viewer with enhanced depth perception
KR101960270B1 (en) 2013-08-15 2019-07-15 비존 엔지니어링 리미티드 Viewer with enhanced depth perception
US10379332B2 (en) 2014-11-17 2019-08-13 Vision Engineering Limited Stereoscopic viewing apparatus

Also Published As

Publication number Publication date
CA2120146C (en) 1998-02-03
JP2548524B2 (en) 1996-10-30
GB9218628D0 (en) 1992-10-21
ATE145993T1 (en) 1996-12-15
EP0610454B1 (en) 1996-12-04
DE69306372T2 (en) 1997-05-28
DK0610454T3 (en) 1997-04-14
DE69306372D1 (en) 1997-01-16
JPH07501161A (en) 1995-02-02
ES2098743T3 (en) 1997-05-01
EP0610454A1 (en) 1994-08-17
KR0147414B1 (en) 1998-10-01
US5477385A (en) 1995-12-19
MY109094A (en) 1996-12-31
CA2120146A1 (en) 1994-03-17
TW227605B (en) 1994-08-01

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