GB1538630A - Projector for projecting test representations for eye investigations - Google Patents

Projector for projecting test representations for eye investigations

Info

Publication number
GB1538630A
GB1538630A GB4921077A GB4921077A GB1538630A GB 1538630 A GB1538630 A GB 1538630A GB 4921077 A GB4921077 A GB 4921077A GB 4921077 A GB4921077 A GB 4921077A GB 1538630 A GB1538630 A GB 1538630A
Authority
GB
United Kingdom
Prior art keywords
projector
investigations
eye
disc
coding
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
GB4921077A
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
Application filed by Optische Werke G Rodenstock filed Critical Optische Werke G Rodenstock
Publication of GB1538630A publication Critical patent/GB1538630A/en
Expired 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
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/42—Servomotor, servo controller kind till VSS
    • G05B2219/42212—Rotation over, selection of smallest, shortest angle, distance

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Projection Apparatus (AREA)
  • Details Of Television Systems (AREA)

Abstract

This projector has a rotatable disc (1) with a number of projectable displays (2) arranged concentrically with the axis of rotation of the disc. There is further located on the disc a number of coding tracks (I-V) which are scanned by means of a scanning member (4) which is provided for this purpose with sliding-action contacts. The coding tracks are subdivided into the same number of sections as there are displays present. Each display is assigned one of the sections and has a coding (3). Furthermore, the projector has electronic means which permit each display to be brought, in response to a control command, into the projection beam path in the shortest way. <IMAGE>
GB4921077A 1976-11-25 1977-11-25 Projector for projecting test representations for eye investigations Expired GB1538630A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762653471 DE2653471C3 (en) 1976-11-25 1976-11-25 Projector for projecting test images for eye exams

Publications (1)

Publication Number Publication Date
GB1538630A true GB1538630A (en) 1979-01-24

Family

ID=5993908

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4921077A Expired GB1538630A (en) 1976-11-25 1977-11-25 Projector for projecting test representations for eye investigations

Country Status (8)

Country Link
JP (1) JPS5367988A (en)
CH (1) CH624566A5 (en)
DD (1) DD132921A1 (en)
DE (1) DE2653471C3 (en)
ES (1) ES462864A1 (en)
FR (1) FR2371910A1 (en)
GB (1) GB1538630A (en)
IT (1) IT1106647B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420229A (en) * 1981-02-13 1983-12-13 Clement Clark International Ltd. Ophthalmic instruments
JPS6219144A (en) * 1985-07-17 1987-01-27 株式会社トプコン山形 Eye examination chart projector
CN109512377B (en) * 2018-10-25 2021-05-25 陕西省人民医院 Anerythrochloropsia disease inspection dish

Also Published As

Publication number Publication date
IT1106647B (en) 1985-11-11
DD132921A1 (en) 1978-11-22
ES462864A1 (en) 1978-06-01
DE2653471C3 (en) 1979-10-31
CH624566A5 (en) 1981-08-14
JPS6120292B2 (en) 1986-05-21
FR2371910A1 (en) 1978-06-23
DE2653471A1 (en) 1978-06-01
JPS5367988A (en) 1978-06-16
DE2653471B2 (en) 1979-03-15

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee