Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-10-31
1987-02-17
Corbin, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358225, G02B 2764, G02B 1316
Patent
active
046435395
ABSTRACT:
In known sightline stabilizing apparatus 10 (FIG. 1) a gyro-stabilized reflector 25 maintained in orientation in space about two axes 18 and 26 by gyro means in the mechanism 22. The reflector mechanism is contained in housing 17 and is pivotable about elevation axis 18 in relation thereto. The housing also carries a sensor, e.g. a tv camera providing signals to a remote (non-stabilized) image display device, and is itself rotatable in elevation relative to a platform 16 rotatable in azimuth. The apparatus is normally carried by a vehicle and movements thereof cause servo responses of the mechanism 22 to stabilize the mirror and follow-up movements of the housing and pedestal 16 restore the mirror to the center of its limited motion in the housing. However, changes in elevation angle of the reflector cause rotation of the remote image about the center of its field of view and motion induced changes can rapidly lead to motion sickness in an observer of the image. The improvement of the invention consists of introducing an elevation offset between the mirror and the housing so that the sensor is offset about axis 18 and has essentially the same field of view from the mirror but the image formed is rotated about its receptive axis 20. The image rotation is equal to the elevation offset of the housing/sensor and is applied as a demand signal into the housing elevation-restoring feedback loop.
REFERENCES:
patent: 3634622 (1972-01-01), Wheeler
Corbin John K.
Ferranti plc
Lemmo Vincent J.
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