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US4421393A
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Visual field perimeter and psychomotor tracking performance measuring apparatus
Assignee: UNITED STATES OF AMERICAS REPRESENTED BY SECRETARY OF NAVY
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Filing: 1981-04-27
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Granted: 1983-12-20
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Expires: 2001-04-27
Abstract
Abstract A system for evaluating tolerance to high acceleration as a function of visual field perimeter and psychomotor tracking ability. A semicircular array of light-emitting diodes (LED's) subtend the lateral field of view of a subject. Pairs of opposed LED's are sequentially illuminated inwardly or outwardly at a programmed rate. A control stick manipulated by the subject provides a nulling signal for maintaining a desired pair of LED's illuminated.
Inventors
- 👤 Malcolm M. Cohen
- 👤 James J. Palumbo
- 👤 David C. Johanson
- 👤 John G. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:05
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/16; A61B5/18; A61B3/00; A61B3/02; A61B3/024
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
Apparatus for simultaneously measuring a subject's visual field perimeter and psychomotor tracking ability, comprising, in combination: first control means providing a first analog signal indicative of a preselected constant rate of change of the subject's angle of view; second control means formed to be manipulated by the subject for providing a second analog signal indicative of the force applied thereto; control means connected to recieve said first and second signals for providing a third digital signal indicative of the integrated sum of said first and second signals; display means having a curved array of lights formed to subtend the subject's angle of view at equiangular positions about the angle bisector with opposed pairs of lights connected in parallel, and connected to receive said third signal for illuminating opposed pairs of said lights in response thereto.
Claim 2
Dependent Claim
135 words
Apparatus for simultaneously measuring a subject's visual field perimeter and psychomotor tracking ability, comprising, in combination: first control means providing a first analog signal indicative of a preselected constant rate of change of the subject's angle of view; second control means formed to be manipulated by the subject for providing a second analog signal indicative of the force applied thereto; control means connected to recieve said first and second signals for providing a third digital signal indicative of the integrated sum of said first and second signals; display means having a curved array of lights formed to subtend the subject's angle of view at equiangular positions about the angle bisector with opposed pairs of lights connected in parallel, and connected to receive said third signal for illuminating opposed pairs of said lights in response thereto.
Claim 3
Dependent Claim
114 words
Apparatus according to claim 1 wherein said control means further comprises: first summing means connected to receive said first and second signals for providing a signal indicative of the sum of the received signals; integrating means connected to receive said first summing means signal for producing a multibit binary-coded signal indicative of the integral of said summing means signal; first decoder means connected to receive the most significant bits of said binary-coded signal for energizing one of a first plurality of outputs of said third signal; and second decoder means connected to receive the least significant bits of said binary-coded signal for energizing one of a second plurality of outputs of said third signal.
Claim 4
Dependent Claim
85 words
Apparatus according to claim 2 wherein said integrating means further comprises: an integrator connected to receive said summing means signal for producing an analog signal indicative of the integration of the received signal; generator means for producing a pseudo-random analog signal; second summing means connected to receive the analog signals from said integrator and generator means for producing a signal indicative of the sum of the received analog signals; and converter means connected to receive said second summing means signal for producing the binary signal.
Claim 5
Dependent Claim
51 words
Apparatus according to claim 2 wherein each of said first plurality of outputs are connected in common to one terminal of a selected plurality of said light pairs and the other terminal of each of said commonly connected light pairs are connected to respective ones of said second plurality of outputs.
Claim 6
Dependent Claim
16 words
Apparatus according to claim 1 wherein said lights are diodes emitting light in the red spectrum.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 5 wherein said display means further includes a white light at the angle bisector.
Claim 8
Dependent Claim
36 words
Apparatus according to claim 3 wherein said first control means comprises: a voltage divider for providing a selected constant voltage output; and an amplifier connected to receive said voltage output for producing said first analog signal.
Claim 9
Dependent Claim
44 words
Apparatus according to claim 4 wherein said first plurality of outputs correspond to a like number of equi-angular cardinal positions in either bisected angle of view, and said second plurality of outputs correspond to a like number of equi-angular positions between said cardinal positions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |