FR2283654A1 - Projector for rotary test signs for eye test - allows precise indication of angular position of signs - Google Patents

Projector for rotary test signs for eye test - allows precise indication of angular position of signs

Info

Publication number
FR2283654A1
FR2283654A1 FR7527079A FR7527079A FR2283654A1 FR 2283654 A1 FR2283654 A1 FR 2283654A1 FR 7527079 A FR7527079 A FR 7527079A FR 7527079 A FR7527079 A FR 7527079A FR 2283654 A1 FR2283654 A1 FR 2283654A1
Authority
FR
France
Prior art keywords
signs
test
projector
angular position
rotary
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.)
Granted
Application number
FR7527079A
Other languages
French (fr)
Other versions
FR2283654B1 (en
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.)
Optische Werke G Rodenstock
Original Assignee
Optische Werke G Rodenstock
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
Priority claimed from DE19742442804 external-priority patent/DE2442804C3/en
Application filed by Optische Werke G Rodenstock filed Critical Optische Werke G Rodenstock
Publication of FR2283654A1 publication Critical patent/FR2283654A1/en
Application granted granted Critical
Publication of FR2283654B1 publication Critical patent/FR2283654B1/fr
Granted legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
    • A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
    • A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Animal Behavior & Ethology (AREA)
  • Ophthalmology & Optometry (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Eye Examination Apparatus (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Projector for test signs for eye test comprises a control apparatus (3) for electronically controlling rotation of at least one sign about the axis (12) of projection by means of a rotary prism (11), and providing a digital indication (4) of the angular position of the sign. Pref. a coding plate (14) cooperating with sliding contacts (15) is non-rotatably connected to the prism, and is coded so as to produce electrical signals required for the digital indication. The projector also includes a light source (7), a condenser assembly (8), and a rotary test plate (9) containing test signs and switched from one sign to the next by a drive motor (10).
FR7527079A 1974-09-06 1975-09-04 Projector for rotary test signs for eye test - allows precise indication of angular position of signs Granted FR2283654A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742442804 DE2442804C3 (en) 1974-09-06 Projector for projecting test marks for eye exams

Publications (2)

Publication Number Publication Date
FR2283654A1 true FR2283654A1 (en) 1976-04-02
FR2283654B1 FR2283654B1 (en) 1981-08-21

Family

ID=5925088

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7527079A Granted FR2283654A1 (en) 1974-09-06 1975-09-04 Projector for rotary test signs for eye test - allows precise indication of angular position of signs

Country Status (2)

Country Link
JP (1) JPS5146793A (en)
FR (1) FR2283654A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417969A1 (en) * 1978-02-22 1979-09-21 Oculus Optikgeraete Gmbh OPTICAL APPARATUS ENABLING IN PARTICULAR EYE ANOMALIES TO MEASURE
FR2478459A1 (en) * 1980-03-21 1981-09-25 Briot Internal Complete eye testing appts. - includes selection of images for testing far and near sight and interchangeable lenses to correct vision faults

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110244456A (en) * 2019-07-16 2019-09-17 江南大学 A kind of vision flow measuring apparatus and its application method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417969A1 (en) * 1978-02-22 1979-09-21 Oculus Optikgeraete Gmbh OPTICAL APPARATUS ENABLING IN PARTICULAR EYE ANOMALIES TO MEASURE
FR2478459A1 (en) * 1980-03-21 1981-09-25 Briot Internal Complete eye testing appts. - includes selection of images for testing far and near sight and interchangeable lenses to correct vision faults

Also Published As

Publication number Publication date
JPS5146793A (en) 1976-04-21
DE2442804A1 (en) 1976-04-01
FR2283654B1 (en) 1981-08-21
DE2442804B2 (en) 1976-10-07

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Legal Events

Date Code Title Description
ST Notification of lapse