GB631251A - Improvements in or relating to compound microscopes - Google Patents

Improvements in or relating to compound microscopes

Info

Publication number
GB631251A
GB631251A GB76147A GB76147A GB631251A GB 631251 A GB631251 A GB 631251A GB 76147 A GB76147 A GB 76147A GB 76147 A GB76147 A GB 76147A GB 631251 A GB631251 A GB 631251A
Authority
GB
United Kingdom
Prior art keywords
transparent
opaque
opaque portions
diaphragm
annuli
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
GB76147A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB76147A priority Critical patent/GB631251A/en
Publication of GB631251A publication Critical patent/GB631251A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/06—Means for illuminating specimens
    • G02B21/08—Condensers
    • G02B21/14—Condensers affording illumination for phase-contrast observation

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

631,251. Microscopes. HALLIMOND, A. F. Jan. 9, 1947, No. 761. [Class 97 (i)] To improve the image contrast, two diaphragms, having transparent and opaque portions, are placed respectively at or near the upper principal focus of the objective and at a conjugate position below the condenser, a primary transparent portion of the upper diaphragm being shaped to transmit a direct beam defined bv the lower diaphragm, while its opaque portions intercept any deviated light over a certain angle on either side of the direct beam, determined by their width, the upper diaphragm having a transparent portion at least outside one of the opaque portions to maintain resolution. As shown, the lower diaphragm comprises a transparent annulus 1 and the upper diaphragm a transparent annulus 6 surrounded by two opaque annuli 7, 8. The central portion 9 may be transparent and the outer portion 10 opaque or vice-versa or both may be transparent. The annuli may be marked directly on the objective and/or condenser. In a modification, the effect of the opaque portions may be produced by making them of polarizing material and using a suitable polarization system.
GB76147A 1947-01-09 1947-01-09 Improvements in or relating to compound microscopes Expired GB631251A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB76147A GB631251A (en) 1947-01-09 1947-01-09 Improvements in or relating to compound microscopes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB76147A GB631251A (en) 1947-01-09 1947-01-09 Improvements in or relating to compound microscopes

Publications (1)

Publication Number Publication Date
GB631251A true GB631251A (en) 1949-10-31

Family

ID=9710055

Family Applications (1)

Application Number Title Priority Date Filing Date
GB76147A Expired GB631251A (en) 1947-01-09 1947-01-09 Improvements in or relating to compound microscopes

Country Status (1)

Country Link
GB (1) GB631251A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674157A (en) * 1949-08-15 1954-04-06 Leitz Ernst Gmbh Phase microscope
DE974173C (en) * 1953-09-13 1960-10-06 Freiberger Praez Smechanik Veb Device for microscopic imaging of non-self-luminous objects, the details of which cause no or insufficient brightness differences, by means of phase contrast
US3100817A (en) * 1960-06-09 1963-08-13 Ball Brothers Res Corp Image converter and amplifier
US3161717A (en) * 1960-05-04 1964-12-15 Barabas Janos Microscope substage illuminating device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674157A (en) * 1949-08-15 1954-04-06 Leitz Ernst Gmbh Phase microscope
DE974173C (en) * 1953-09-13 1960-10-06 Freiberger Praez Smechanik Veb Device for microscopic imaging of non-self-luminous objects, the details of which cause no or insufficient brightness differences, by means of phase contrast
US3161717A (en) * 1960-05-04 1964-12-15 Barabas Janos Microscope substage illuminating device
US3100817A (en) * 1960-06-09 1963-08-13 Ball Brothers Res Corp Image converter and amplifier

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