US3655276A - Ophthalmic refracting chart projector - Google Patents

Ophthalmic refracting chart projector Download PDF

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Publication number
US3655276A
US3655276A US873022A US3655276DA US3655276A US 3655276 A US3655276 A US 3655276A US 873022 A US873022 A US 873022A US 3655276D A US3655276D A US 3655276DA US 3655276 A US3655276 A US 3655276A
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United States
Prior art keywords
disks
slide
projector
motor
relative
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 - Lifetime
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US873022A
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English (en)
Inventor
Leonard A Wilkinson
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Leica Microsystems Inc
Original Assignee
American Optical Corp
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Assigned to WARNER LAMBERT TECHNOLOGIES, INC., A CORP OF TX. reassignment WARNER LAMBERT TECHNOLOGIES, INC., A CORP OF TX. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WARNER LAMBERT COMPANY
Assigned to WARNER LAMBERT COMPANY, A CORP. OF DEL. reassignment WARNER LAMBERT COMPANY, A CORP. OF DEL. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN OPTICAL CORPORATION,
Assigned to CAMBRIDGE INSTRUMENTS INC., A DE CORP. reassignment CAMBRIDGE INSTRUMENTS INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WARNER LAMBERT TECHNOLOGIES, INC.
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    • 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

Definitions

  • Typical prior art projectors include a plurality of slides or targets disposed in a linear relationship and moved back and forth or up and down relative to the light path so as to be selectively projected on a screen. In such apparatus, the placement of the desired slide in the projector light path is accomplished manually.
  • Another object is to provide such a projector having controls to permit selective retrieval of the slides contained therein, and allow the practitioner to present slides to the patient in a sequence, particularly preferred by him.
  • the present invention is practiced in one form by an ophthalmic refracting chart projector in which slides are mounted peripherally around discs mounted rotatably relative to the projector light path.
  • the discs are rotatable either continuously or in desired increments to selectively place desired slides in the projector light path.
  • Astigmatic and paraboline slides or charts are also mounted peripherally on a rotatable disc and are themselves rotatable relative to the disc by such control.
  • FIG. 1 is a side sectional view of part of a refracting chart projector according to the present invention
  • FIG. 2 is a top view of the apparatus shown in FIG. 1;
  • FIGS. 3 and 4 are end and side views respectively of a part of the apparatus shown and indicated in FIG. 1;
  • FIGS. 5 and 6 are end and side views respectively of another part of the apparatus shown and indicated in FIG. 1;
  • FIGS. 7 and 8 are end and side views respectively of another part of the apparatus shown and indicated in FIG. 1;
  • FIG. 9 is an electrical diagram representing the control circuit for the projector apparatus of the present invention.
  • FIG. 1 there is shown a part of a refracting chart projector, generally represented at 2. It includes a lamp 4 disposed relative to a lens system 6 to provide a light path or optical axis 7.
  • a frame generally indicated by various members 8, supports the structure of this projector apparatus including a rotatable shaft 10.
  • Rotatable shaft 10 has mounted rotatably relative thereto a first slide-carrying disc 12 and a third slide-carrying disc 16. Shaft 10 further has fixed thereto for rotation therewith a second slide-carrying disc 14. Each of these slide discs 12, 14 and 16 is more clearly shown by individual views in FIGS. 3 through 8.
  • the first slide disc 12 which includes a cylindrical bearing member 18 and a disc plate portion 20 integral therewith.
  • Plate 20 defines a plurality of apertures 22 disposed around its periphery for the accommodation of slides.
  • rotatable cells 23 containing certain slides or charts such as a paraboline chart shown at 24 and an astigmatic or sun burst" chart shown at 26.
  • Cells 23 are rotatably mounted within apertures 22 and each has a spur gear 28 integral and concentric therewith.
  • the paraboline chart 24 is rotatable in its entirely while only the pointer rotates relative to a stationary astigmatic chart 26.
  • Disc plate 20 serves as a mounting plate for a gear train including gears 30 and 32, gear 30 being in mesh with gear 28.
  • Gear 32 meshes with gear 30 and further with a spur gear 34 which is rotatably disposed about and concentric with shaft bearing 18.
  • Gears 30 and 32 are mounted relative to plate 20 by suitable fasteners as shown at 36.
  • Spur gear 34 is integral with a hearing member 38, which is rotatable about bearing 18, and which in turn is integral with another gear which is axially displaced and concentric with gear 34.
  • gear 40 operating through gear 34, rotates gears 32 and 30 and ultimately gears 28 to rotate the cells 23 to vary the axis of chart 24 and the pointer relative to chart 26, to keep pointer in line with vertical axis of paraboline chart, i.e. pointer and paraboline slide indicate the same angular displacement when shown to the patient.
  • a gear 42 similar to gear 40 and coaxial therewith, is mounted integral with bearing 18 so as to be rotatable with bearing 18 and plate 20.
  • Disc 14 is positively fastened to shaft 10 by means of a pin 44 so as to be rotatable therewith.
  • Slide disc 14 defines a plurality of slide apertures disposed around its periphery as exemplified at 46.
  • Disc 16 includes an integral shaft bearing 48 which in turn is integral with a gear 50, the gear 50 and bearing 48 being coaxial with disc 16 and rotatable about shaft 10.
  • Disc 16 also defines a plurality of slide apertures 52 disposed around its periphery.
  • a spring clip 54 is suitably fastened to disc plate 16 and provides a biasing force against plate 16 so as to hold slides which are inserted over the apertures 52 to the plate 16.
  • An example of such a slide is shown at 56.
  • a similar spring clip may be included on any of the other disc plates 12 and 14.
  • discs 12 and 16 are rotatable relative to shaft 10 and that disc 14 is fastened to shaft 10.
  • a gear 58 is also fastened to shaft 10.
  • a plurality of motors 60, 62, 64, 66 are mounted relative to frame 8 as shown in FIG. 2. These motors have respectively mounted thereto pinions 41, 43, 5 I, 59. Pinion 41 is disposed in driving relationship to gear 40. Pinion 43 is in driving relationship to gear 42. Pinion 51 is in driving relationship to gear 50. Pinion 59 is in driving relationship with gear 58. That is, motor 60 controls, through gear 40, the rotation of cells 23. Motor 62 through gear 42 drives disc 12 on shaft 10. Motor 64 through gear 50 drives disc 16 on shaft 10. And motor 66 through gear 58 drives shaft 10 and disc 14.
  • Discs 12 and 16 each have projecting therefrom a switch actuator lug 75. These lugs are operatively disposed relative to one only of the two limit switches 68 corresponding to its respective disc.
  • disc 14 has on its periphery a relatively large cam recess 76 in operative relation to an oversize follower 71 of one only of the limit switches 68 associated with disc 14. The purpose of these lugs 75 and the recess 76 is to actuate at a single position of the disc a motorstop switch 68, by opening such switch. Recess 76 performs the same function as lugs 75, the reason for its presence on disc 14 is space limitations.
  • oversize recess 76 and its associated follower 71 prevent follower 71 from moving to a shut off position at any of the other cam recesses around disc 14.
  • switch 74 When switch 74 is in the off position, discs 12, 14 and 16 return to predetermined base or normal position.
  • each motor there is also in association with each motor a manual normally open switch 72 which, when held closed, permits continuous operation of its associated motor.
  • a switch 72 When a switch 72 is only momentarily closed and then opened, however, the associated motor will continue to operate only until the corresponding disc member reaches the next cam recess into which follower 70 falls opening the motor circuit.
  • each switch 72 can be held closed for continuous operation or it can be simply momentarily closed for starting the associated motor with the motor being stopped automatically at a desired spot by the cam switch 68.
  • This optional manual or automatic operation applies to motors 62, 64 and 66.
  • Motor 60 which rotates the axis of cells 23 is shown here as being provided only for manual operation.
  • a separate master switch 74 arms the entire circuit and operates the lamp 4.
  • the box around switches 72, 73 and 74 in FIG. 9 is to indicate that this portion of the control is housed in a separate and portable housing, connected by cable to the rest of the apparatus, for the convenience of the practitioner.
  • switches 72 there are, in association with switches 72, a plurality of normally open switches 73 which are disposed in parallel relationship to switches 72. These switches 73 are operable independently of switches 72 and provide electrical connection to their respective motor windings so that when switch 73 is closed and 72 open, the corresponding motor rotates oppositely from the direction of rotation when switch 72 is closed and 73 open.
  • slide discs 12, 14 and 16 are rotatable in either direction. This is in addition to the alternative continuous or stepping modes of operation above-described.
  • the apertures of the discs 12, 14 and 16 are disposed one at a time in optical axis 7. It will be appreciated that there will always be one slide aperture of each disc aligned with axis 7. This means that, to project a given slide in a given disc without interference, the other two apertures of the other two discs which lie in the optical axis must be clear of targets. Accordingly, in each of the discs 12, 14 and 16, there must be at least one clear aperture.
  • focus is made at the plane of dial 12 and blocks of glass mounted in the clear apertures of dial 12, one block of glass of a first thickness for focusing dial 14 and one block of glass of a second thickness for focusing dial 16.
  • a slide projector having a plurality of rotatable coaxial disks each defining a plurality of slide apertures disposed peripherally therearound and positionable one at a time in the optical axis of said projector,
  • each of said disks being separately geared to a motor for rotation therewith
  • control means to effect motor operation in continuous and incremental modes of rotation in either direction
  • one of said disks having an individual slide cell rotatably mounted relative to the disk and disposed coincidentally with one of said apertures, said slide cell being geared to a motor for rotation therewith relative to said disk,
  • each of said disks defining a clear aperture enabling a slide to be projected from one of the other of said disks
  • one of said disks being normally in focus relative to the projector optical system and carrying a block of glass in two of its apertures for the proper shifting of the projection focus for the other disks,
  • each of said disks being operatively disposed relative to a switch for the energizing of its respective motor, each of said switches being cam actuatable by its respective disk so as to be opened only at the normal position of the disk and closed at all other positions thereof,

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)
  • Projection Apparatus (AREA)
US873022A 1969-10-31 1969-10-31 Ophthalmic refracting chart projector Expired - Lifetime US3655276A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87302269A 1969-10-31 1969-10-31

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US3655276A true US3655276A (en) 1972-04-11

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US873022A Expired - Lifetime US3655276A (en) 1969-10-31 1969-10-31 Ophthalmic refracting chart projector

Country Status (4)

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US (1) US3655276A (de)
JP (1) JPS5535131B1 (de)
DE (1) DE2042109C2 (de)
GB (1) GB1308345A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947098A (en) * 1973-06-29 1976-03-30 Essilor International "Compagnie Generale d'Optique" Light projector device, particularly for eyesight examination tests
JPS5268698U (de) * 1975-11-17 1977-05-21
JPS5268697U (de) * 1975-11-17 1977-05-21
JPS52105897U (de) * 1976-02-03 1977-08-11
US4092574A (en) * 1976-12-08 1978-05-30 American Optical Corporation Automatic remote controlled opthalmic refracting chart projector
EP0143151A2 (de) * 1980-08-11 1985-06-05 BAUSCH & LOMB INCORPORATED Bauteil für ein Augenuntersuchungsgerät
US5302982A (en) * 1993-02-23 1994-04-12 Woodlyn Inc. Projector slide apparatus
CN107468205A (zh) * 2017-09-11 2017-12-15 刘寒冰 一种眼科科室使用的多功能自动检测视力箱

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016067852A (ja) * 2014-10-02 2016-05-09 株式会社イナミ スリットランプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1698013A (en) * 1924-09-13 1929-01-08 Zeng Standard Company De Projection device
FR856897A (fr) * 1939-06-26 1940-08-13 Zeiss Carl Lunette pour télémètres
US2244687A (en) * 1937-06-19 1941-06-10 I R System Inc Art of image formation
US2887006A (en) * 1956-08-13 1959-05-19 White Rodgers Company Visual training projector
US2947215A (en) * 1957-03-04 1960-08-02 George A Mitchell Compensating film warpage in projectors
US3294473A (en) * 1963-01-09 1966-12-27 Benson Optical Company Visual acuity projector with electric motor control for film chart and rotary astigmatic test element
US3341275A (en) * 1963-10-21 1967-09-12 Benson Optical Company Remote control visual acuity test projector with electric motor carried by film chart and coupled to astigmatism test element

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1864517U (de) * 1962-10-27 1962-12-27 J D Moeller Optische Werke G M Sehzeichenprojecktor.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1698013A (en) * 1924-09-13 1929-01-08 Zeng Standard Company De Projection device
US2244687A (en) * 1937-06-19 1941-06-10 I R System Inc Art of image formation
FR856897A (fr) * 1939-06-26 1940-08-13 Zeiss Carl Lunette pour télémètres
US2887006A (en) * 1956-08-13 1959-05-19 White Rodgers Company Visual training projector
US2947215A (en) * 1957-03-04 1960-08-02 George A Mitchell Compensating film warpage in projectors
US3294473A (en) * 1963-01-09 1966-12-27 Benson Optical Company Visual acuity projector with electric motor control for film chart and rotary astigmatic test element
US3341275A (en) * 1963-10-21 1967-09-12 Benson Optical Company Remote control visual acuity test projector with electric motor carried by film chart and coupled to astigmatism test element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
The Optician, Vol. 153, No. 3959, Feb. 17, 1967, pps. 157 162 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947098A (en) * 1973-06-29 1976-03-30 Essilor International "Compagnie Generale d'Optique" Light projector device, particularly for eyesight examination tests
JPS5268698U (de) * 1975-11-17 1977-05-21
JPS5268697U (de) * 1975-11-17 1977-05-21
JPS566084Y2 (de) * 1975-11-17 1981-02-10
JPS52105897U (de) * 1976-02-03 1977-08-11
US4094592A (en) * 1976-02-03 1978-06-13 Tokyo Kogaku Kikai Kabushiki Kaisha Ophthalmic examination chart projector
JPS5525281Y2 (de) * 1976-02-03 1980-06-18
US4092574A (en) * 1976-12-08 1978-05-30 American Optical Corporation Automatic remote controlled opthalmic refracting chart projector
EP0143151A2 (de) * 1980-08-11 1985-06-05 BAUSCH & LOMB INCORPORATED Bauteil für ein Augenuntersuchungsgerät
EP0143151A3 (de) * 1980-08-11 1985-07-10 BAUSCH & LOMB INCORPORATED Bauteil für ein Augenuntersuchungsgerät
US5302982A (en) * 1993-02-23 1994-04-12 Woodlyn Inc. Projector slide apparatus
CN107468205A (zh) * 2017-09-11 2017-12-15 刘寒冰 一种眼科科室使用的多功能自动检测视力箱

Also Published As

Publication number Publication date
DE2042109A1 (de) 1971-05-06
JPS5535131B1 (de) 1980-09-11
GB1308345A (en) 1973-02-21
DE2042109C2 (de) 1985-05-15

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Legal Events

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AS Assignment

Owner name: WARNER LAMBERT TECHNOLOGIES, INC.; 6373 STEMMONS F

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WARNER LAMBERT COMPANY;REEL/FRAME:004034/0700

Effective date: 19820514

Owner name: WARNER LAMBERT COMPANY, 201 TABOR ROAD, MORRIS PLA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN OPTICAL CORPORATION,;REEL/FRAME:004034/0681

Effective date: 19820513

AS Assignment

Owner name: CAMBRIDGE INSTRUMENTS INC., A DE CORP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WARNER LAMBERT TECHNOLOGIES, INC.;REEL/FRAME:004893/0097

Effective date: 19880407