GB1538630A - Projector for projecting test representations for eye investigations - Google Patents
Projector for projecting test representations for eye investigationsInfo
- 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
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>
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)
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 |
-
1976
- 1976-11-25 DE DE19762653471 patent/DE2653471C3/en not_active Expired
-
1977
- 1977-08-26 JP JP10248277A patent/JPS5367988A/en active Granted
- 1977-09-26 FR FR7728866A patent/FR2371910A1/fr active Pending
- 1977-10-03 ES ES462864A patent/ES462864A1/en not_active Expired
- 1977-10-31 CH CH1324477A patent/CH624566A5/en not_active IP Right Cessation
- 1977-11-11 IT IT5178077A patent/IT1106647B/en active
- 1977-11-23 DD DD20221977A patent/DD132921A1/en unknown
- 1977-11-25 GB GB4921077A patent/GB1538630A/en not_active Expired
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 |