WO1994016351A1 - Telescope a miroirs - Google Patents

Telescope a miroirs Download PDF

Info

Publication number
WO1994016351A1
WO1994016351A1 PCT/GB1994/000041 GB9400041W WO9416351A1 WO 1994016351 A1 WO1994016351 A1 WO 1994016351A1 GB 9400041 W GB9400041 W GB 9400041W WO 9416351 A1 WO9416351 A1 WO 9416351A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
telescope
reflecting
mirror
reflecting telescope
Prior art date
Application number
PCT/GB1994/000041
Other languages
English (en)
Inventor
Peter Wise
Original Assignee
Peter Wise
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 Peter Wise filed Critical Peter Wise
Priority to AU58366/94A priority Critical patent/AU5836694A/en
Publication of WO1994016351A1 publication Critical patent/WO1994016351A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G02B17/0852—Catadioptric systems having a field corrector only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G02B23/06—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors having a focussing action, e.g. parabolic mirror

Definitions

  • This invention relates to a reflecting telescope. Telescopes of over lOOx magnification are widely used for astronomy, however these high-powered telescopes have to be mounted on a support such as a tripod which holds them steady. High-powered telescopes are therefore inconvenient for terrestrial use, and instead lower-powered binoculars of 7-lOx magnification are more favoured.
  • High-magnification telescopes are generally formed of the reflecting-type, so that the overall length of the instrument is not too great.
  • Conventional reflecting telescopes comprise a wide elongate tube open at one end, and a parabolic primary reflecting mirror which reflects light entering the tube onto a secondary reflecting mirror mounted on the axis of the tube. The secondary mirror reflects light into an eyepiece which projects radially from the tube.
  • These reflecting-type telescopes are unsuitable for terrestrial uses such as bird-watching, because the image viewed through the eye-piece is inverted.
  • lower powered reflecting telescopes e.g. of 20-30x magnification suffer from the drawback that the secondary mirror creates a black spot in the centre of the image.
  • Telescopes for terrestrial use are generally of the Keplerian-type in which a series of positive lenses are mounted in a tube.
  • a disadvantage of using lenses for high magnifications is that they cause chromatic abberation: this causes the image observed to have a so-called false colour, thus making these types of telescopes unsuitable for bird- watching and other activities where it is important to have true colours.
  • a reflecting telescope comprising a tube open at one end, a primary concave reflecting mirror mounted in the tube and arranged to be directed towards an object to be observed, a secondary reflecting mirror mounted in front of the primary mirror on the axis of the tube, a negative lens mounted on the axis of the tube between said mirrors, the secondary mirror being angled so as to reflect light which is reflected by the primary mirror through the negative lens into an eyepiece which projects radially from the tube, the eye-piece comprising a positive lens and an ocular which is arranged to direct the light emerging from the tube rearwardly of the telescope.
  • the negative lens allows a smaller secondary mirror to be used compared to conventional similarly powered reflecting- telescope ⁇ .
  • the positive lens in the eye-piece effectively reverses the effects of the negative lens so that a magnified image can be observed.
  • the magnification of the telescope can be varied by changing the power of the two lenses.
  • the telescope is convenient to use because the ocular is arranged so that the user looks in the direction in which the telescope is pointing.
  • the positive and negative lenses are achromatic doublets so that only negligible chromatic abberation is introduced by the lenses. Furthermore chromatic abberation is reduced because the diameter of the lenses is small compared with the aperture of the telescope.
  • the positive lens is movable so that the image can be focused.
  • the eye-piece comprises a prism which refracts light emerging radially from the tube into the ocular.
  • the light may be reflected by a mirror into the ocular.
  • a handle is disposed on the tube adjacent its open front end, so that the tube can be supported e.g. near its balance point on the user's shoulder whilst he is looking through the telescope.
  • the handle is removable so that the telescope can be mounted on a tripod.
  • a reflecting telescope comprising an elongate tube 10 which is open at one end. The opposite end is provided with a parabolic primary reflecting mirror 11 which is directed towards the open end of i 5 the tube. The open end of the tube is closed by a transparent * ⁇ optical window 13 which may be flat or Schmidt-profiled.
  • a flat secondary mirror 12 is mounted axially in the tube 10 on the optical window 13. The plane of the secondary mirror 12 is angled at 45° to the axis of the tube.
  • the 10 is also mounted on the axis of the tube 10, in front of the secondary mirror 12.
  • An L-shaped eye-piece 20 projects radially from the tube 10 adjacent its open end.
  • the eye-piece 20 comprises a positive lens 15, an Amici-prism 17 and an ocular 14.
  • the positive and negative lenses 15,16 are
  • the 20 concave primary mirror 11, the reflected light waves converging towards the axis of the tube.
  • the negative lens 16 directs a beam of light having a focal point of infinity onto the secondary mirror 12.
  • the mirror 12 reflects the beam into the eye-piece 20.
  • the positive lens 15 in the eye-piece 20 returns
  • the prism 17 refracts the light beam through 90° reverting the image so that the final image is upright.
  • the ocular 14 is directed rearwardly and has a short focal length so that the image can be observed when the user places his eye close to the eye-piece 20.
  • a handle 19 projects forwardly from the open end of the
  • 35 magnifications of 30-40x can be used.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Telescopes (AREA)

Abstract

Télescope à miroirs comprenant un tube (10) ouvert à une extrémité, un premier miroir (11) réflecteur qui est monté dans le tube et placé de manière à être dirigé vers l'objet devant être observé, un deuxième miroir (12) réflecteur qui est monté devant le premier miroir (11) sur l'axe du tube et une lentille divergente (16) qui est montée sur l'axe du tube entre les deux miroirs (11, 12). Le deuxième miroir (12) est orienté selon un angle qui lui permet de réfléchir la lumière qui est réfléchie par le premier miroir à travers la lentille divergente (16), dans un viseur (20) qui sort radialement du tube (10), le viseur comprenant une lentille convergente (15) et un oculaire (14) qui dirige la lumière sortant du tube vers l'arrière du télescope.
PCT/GB1994/000041 1993-01-08 1994-01-10 Telescope a miroirs WO1994016351A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58366/94A AU5836694A (en) 1993-01-08 1994-01-10 Reflecting telescope

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9300283.0 1993-01-08
GB939300283A GB9300283D0 (en) 1993-01-08 1993-01-08 Reflecting telescope

Publications (1)

Publication Number Publication Date
WO1994016351A1 true WO1994016351A1 (fr) 1994-07-21

Family

ID=10728450

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/000041 WO1994016351A1 (fr) 1993-01-08 1994-01-10 Telescope a miroirs

Country Status (3)

Country Link
AU (1) AU5836694A (fr)
GB (1) GB9300283D0 (fr)
WO (1) WO1994016351A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001079909A1 (fr) * 2000-04-13 2001-10-25 Peter Wise Telescope a reflexion
GB2407391A (en) * 2003-10-21 2005-04-27 Peter Wise Reflector telescope
ITPI20130001A1 (it) * 2013-01-02 2014-07-03 Carlo Corti Telescopio riflettore compatto con trascurabile ostruzione del secondario ed elevata lunghezza focale equivalente

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005705A1 (fr) * 1978-06-01 1979-12-12 Jean Delage Lunette optique et son application à la réalisation de jumelles
US4221459A (en) * 1978-08-07 1980-09-09 Fisher William E Erect image telescope optical system
JPS568109A (en) * 1979-07-03 1981-01-27 Toshikazu Iwasaki Reflecting telescope
US4477156A (en) * 1981-10-29 1984-10-16 Rolin J. Gebelein Reflecting telescope with correcting lens
US4783158A (en) * 1987-09-14 1988-11-08 Shackman Stanley J High image contrast reflecting telescope

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005705A1 (fr) * 1978-06-01 1979-12-12 Jean Delage Lunette optique et son application à la réalisation de jumelles
US4221459A (en) * 1978-08-07 1980-09-09 Fisher William E Erect image telescope optical system
JPS568109A (en) * 1979-07-03 1981-01-27 Toshikazu Iwasaki Reflecting telescope
US4477156A (en) * 1981-10-29 1984-10-16 Rolin J. Gebelein Reflecting telescope with correcting lens
US4783158A (en) * 1987-09-14 1988-11-08 Shackman Stanley J High image contrast reflecting telescope

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 5, no. 52 (P - 056) 11 April 1981 (1981-04-11) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001079909A1 (fr) * 2000-04-13 2001-10-25 Peter Wise Telescope a reflexion
US6888672B2 (en) 2000-04-13 2005-05-03 Cape Instruments Ltd. Reflector telescope
GB2407391A (en) * 2003-10-21 2005-04-27 Peter Wise Reflector telescope
ITPI20130001A1 (it) * 2013-01-02 2014-07-03 Carlo Corti Telescopio riflettore compatto con trascurabile ostruzione del secondario ed elevata lunghezza focale equivalente

Also Published As

Publication number Publication date
GB9300283D0 (en) 1993-03-03
AU5836694A (en) 1994-08-15

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