# Patent

## Title
Methods and systems for transferring information between a movable system and another system

## Abstract

Methods and systems for transferring information between a movable system and another system. The movable subsystem includes an electrical component providing electrical signal including information. Electromagnetic radiation is modulated according to the information. The other subsystem includes a receiving component that receives the modulated electromagnetic radiation and converts the received electromagnetic radiation into other electrical signals.

## Background
BACKGROUND OF THE INVENTION
Many systems (such as, for example, scanners, printers, and recording devices) include, within the system enclosure, a movable subsystem and another subsystem, where the two subsystems transfer information.
A typical example is the image acquisition subsystem in a scanner and the processing subsystem. In such an example, the image acquisition subsystem includes an image acquisition device that acquires a scanned image. The scanned image data has to be transferred to the processing subsystem. However, typically the image acquisition subsystem moves over the item to be scanned. In conventional systems, a flexible cable connects the image acquisition subsystem to the processing subsystem. In applications where the data rate of the information being transferred between the two subsystems is high, the presence of a long cable can result in signal degradation and the cable itself to serve as a source of radiofrequency interference, either by transmitting or receiving radiofrequency interference. The continued motion of the cable can also result in quality problems.
Furthermore, although in recent years there has been significant effort in reducing the impedance of connections, there are practical (such as cost) and physical limits to the decrease in the impedance of connections. The impedance of the connection is a factor in the degradation of the signal in a long connection.
The above described problems are typical of a movable subsystem connected to another subsystem by a flexible cable. There it is, therefore, a need for a more reliable method of connecting a movable subsystem to another subsystem.
BRIEF SUMMARY OF THE INVENTION
One embodiment of the system of this invention includes a movable subsystem operatively connected to a structure. In one instance, the movable subsystem includes an electrical component capable of providing electrical signals, where the electrical signals comprise information, a source of electromagnetic radiation, and a modulating component capable of receiving the electrical signals and of modulating the source of electromagnetic radiation, wherein the modulated electromagnetic radiation comprises the information. One embodiment of the system of this invention also includes another subsystem operatively connected to the structure, where the other subsystem includes a receiving component capable of receiving electromagnetic radiation emanating from the source of electromagnetic radiation and of converting the received electromagnetic radiation into other electrical signals, and another electrical component capable of receiving the other electrical signals. In a further embodiment, the movable subsystem also includes a receiving component and the other subsystem also includes a source of electromagnetic radiation and a modulating component.
For a better understanding of the present invention, together with other and further needs thereof, reference is made to the accompanying drawings and detailed description and its scope will be pointed out in the appended claims.



BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
FIG. 1 is a pictorial schematic description of an embodiment of the system of this invention;
FIG. 2 is a pictorial schematic description of another embodiment of the system of this invention;
FIG. 3 is a pictorial schematic description of yet another embodiment of the system of this invention; and
FIG. 4 is a pictorial schematic description of a further embodiment of the system of this invention.



DETAILED DESCRIPTION OF THE INVENTION
Unless defined otherwise below, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Still, certain terms are defined herein for the sake of clarity.
The following definitions are provided for specific terms that are used in the following written description.
The term “RF signals,” as used herein, refers to the portion of the electromagnetic radiation spectrum below 1012 Hz (below 1000 GHz).
The term “optical signal,” as used herein, refers to the portion of the electromagnetic radiation spectrum above 1011 Hz (infrared and above, including visible, ultraviolet, x-ray radiation and above).
The term “electrical signal,” as used herein, refers to a signal that is transmitted by means of wired connections.
The term “imager,” as used herein, refers to a device that converts optical signals into electrical signals and enables the acquiring of electrical signals representing an image.
An embodiment 10 of the system of this invention is shown in FIG. 1. Referring to FIG. 1, the embodiment 10 shown therein includes a movable subsystem 15 and another subsystem 20, which in the embodiment shown is a fixed subsystem. The movable subsystem 15 is operatively connected to the structure 25. In the embodiment shown in FIG. 1, two support rails 30 are attached to the structure 25. In one embodiment, the system of this invention not being limited only to this embodiment, the movable subsystem 15 is movably mounted on the two support rails 30 by means of rollers 27. In other embodiments (not shown), the movable subsystem 15 may be coupled to a lead screw, which is driven by a motor attached to the structure 25, or, the movable subsystem 15 may be attached to a cam follower that moved on a cam driven by a motor attached to the structure 25. (The above are only a few of the many possible mechanical designs for a movable subsystem operatively connected to a structure.) The movable subsystem 15 includes an electrical component 35 capable of providing electrical signals, where the electrical signals carry information. In one embodiment the electrical component is an imager, such as, but not limited to, a CCD or CMOS imager, that receives image optical information and converts it to image electrical information. The electrical information originating at the electrical component 35 can be received at a modulating component 40. The modulating component 40 is capable of modulating a source of electromagnetic radiation 45 so that the electromagnetic radiation emitted by the source 45 carries the information that was carried by the electrical signals. In the embodiment shown in FIG. 1, the source of electromagnetic radiation is an antenna 45. The modulating component 40, when the source of electromagnetic radiation is an antenna, is a modulator/transmitter (a conventional component in radio/RF systems).
The other subsystem 20 in FIG. 1 includes a receiving component 50 that is capable of receiving the electromagnetic radiation emitted by the source 45. In the embodiment shown in FIG. 1, the receiving component 50 is another antenna 50 connected to a receiver 55. The other antenna 50 converts the electromagnetic radiation received from the source 45 into modulated electrical signals. The receiver 55 demodulates the modulated electrical signals and provides the demodulated electrical signals to another electrical component 60. The information that was carried by the modulated electromagnetic radiation emitted by the source 45 is carried by the demodulated electrical signals received by the other electrical component 60.
In the embodiment shown in FIG. 1, the source 45 and the receiving component 50 are substantially collinear. In embodiments in which the source 45 and the receiving component 50 are substantially collinear, the source 45 and the receiving component 50 are substantially aligned with respect to which other. There are embodiments of this invention in which the source 45 and the receiving component 50 are substantially aligned with respect to each other without being collinear.
In the embodiment in which the source of electromagnetic radiation is an antenna and the receiving component is another antenna, embodiments in which the source antenna is substantially omnidirectional do not have to be necessarily aligned. The decision to select an embodiment where the source and the receiving component are aligned involves considerations of cost, power requirements, and electromagnetic interference and compatibility.
In embodiments, such as the embodiment 10 shown in FIG. 1, in which the source 45 and the receiving component 50 are RF antennae, the modulating component 40 and the receiver/demodulator can be selected so that they conform to one of the many available standards. Present-day standards include Bluetooth, WiFi (IEEE 802.11) and quasi-standards such as UWB or wireless USB. Embodiments of the system of this invention conforming to any of these standards are within the scope of this invention.
In another embodiment, the source 45 and the receiving component 50 emit and receive radiation by near Field coupling, where such coupling can be capacitive or inductive. Such embodiments of the system of this invention are also within the scope of this invention. In embodiments based on near Field coupling, the distinction between the source 45 and the receiving component 50 is blurred and both the source 45 and the receiving component 50 can be considered as generalized near Field antennas. In some embodiments utilizing near Field coupling a same component can be both a source and a receiving component.
An embodiment in which the source of electromagnetic radiation is an optical source and the receiving component is a detector is shown in FIG. 2. Components in FIG. 2 that are similar to components in FIG. 1 are labeled with the same numerical label as the corresponding component in FIG. 1. The optical source 75 in FIG. 2 can be, in one embodiment, but is not limited to, a VCSEL (vertical Cavity Surface emitting Laser) or any other form of a laser diode or LED. The detector 80 can be one of the many possible optical detectors (for example, but not limited to, one of the detectors described in E. L. Dereniak, D. G. Crowe, Optical radiation Detectors, ISBN 0-471-89797-3, 1984). In some embodiments, the receiving component may also include a demodulator.
It should be noted that, in embodiments utilizing an optical source, the optical source may include optical elements to collimate, focus, or otherwise modify the emitted optical beam and that the detector may include optical elements to collimate, focus, or otherwise modify the received optical beam.
Exemplary embodiments of the system of this invention include embodiments in which the movable subsystem 15 is a scanning subsystem and the electrical component 35 is an imager. In conventional scanners, the scanning subsystem is electrically connected to other subsystems by means of a cable (typically, a flexible cable) with a service loop.
An embodiment of the system of this invention in which the electrical component capable of providing the electrical signals is located in another subsystem, which is a subsystem attached to the structure, is shown in FIG. 3. Referring to FIG. 3, a subsystem 115 is attached to the structure 125. The subsystem 115 includes an electrical component 135 capable of providing electrical signals where the electrical signals carry information, a modulating component 140 that receives the electrical signals and modulates a source of electromagnetic radiation 145. The modulated electromagnetic radiation carries the information. A movable subsystem 120 includes a receiving component 150 that receives the modulated electromagnetic radiation and converts the modulated electromagnetic radiation into other electrical signals and another electrical component 160 that receives the electrical signals obtained from demodulating the electromagnetic radiation. The movable subsystem 120 is operatively connected to the structure 125. The operative connection may be, but is not limited to, one of the embodiments described hereinabove. In the embodiment shown in FIG. 3, the source 145 of electromagnetic radiation is an antenna 145 and the receiving component 150 includes another antenna and a receiver. In other embodiments, the source 145 of electromagnetic radiation can be an optical source and the receiving component 150 can include an optical detector. Note that the source 145 and the receiving component can be substantially aligned with each other or substantially collinear.
An exemplary embodiment of the system shown in FIG. 3 is a printer in which the print head is located in the movable subsystem 120. Print information is generated by the electrical component 135 and has to be transmitted to the printing component 160.
It should be noted that embodiments that combine the features of the embodiment shown in FIGS. 1 and 3 are also within the scope of this invention. In embodiments such as the embodiment shown in FIG. 4, the mobile subsystem 220 includes a transmitting/receiving antenna 250, a transceiver 255 and an electrical component 260. The other subsystem 215 includes another transmitting/receiving antenna 245, another transceiver 240 and another electrical component 235. It should be noted that the transmitting/receiving antenna 250, 245 can be antennas and the transceiver 240, 255 can be a receiver and a separate modulator. Thus, the antennas 245, 250 and their corresponding transceivers 240, 255 can act as either sources of electromagnetic radiation or as receiving components, wherein the transceivers act as modulating components when their corresponding antenna acts as a source of electromagnetic radiation.
During operation of the embodiments of the system this invention, electrical signals that carry information are converted into modulated electromagnetic radiation, where the modulated electromagnetic radiation also carries the information. The modulated electromagnetic radiation is propagated between a movable subsystem and another subsystem. The propagated electronic radiation is received and then converted back into electrical signals. In that manner at the information is carried by electrical signals initially, by electromagnetic radiation after the electromagnetic radiation is modulated by the electrical signals, and finally the information is carried again by electrical signals which are obtained by demodulating the electromagnetic radiation. In the embodiments of the system of this invention, the movable system is operatively connected to a structure and the other system is also operatively connected to the same structure.
Although, in the embodiments shown hereinabove, one subsystem is a movable subsystem and the other subsystem is a fixed subsystem, embodiments in which both subsystems are movable are within the scope of this invention.
Although the invention has been described with respect to various embodiments, it should be realized this invention is also capable of a wide variety of further and other embodiments within the spirit and scope of the appended claims.

## Claims

1. A device comprising:
a movable scanning subsystem configured to scan an image while moving and physically connected to a structure, said movable scanning subsystem comprising:
an electrical component capable of providing electrical signals, said electrical signals comprising information related to the scanned image;
a source of electromagnetic radiation;
a modulating component capable of receiving said electrical signals and of modulating said source of electromagnetic radiation so that said source of electromagnetic radiation emanates modulated electromagnetic radiation that comprises said information related to the scanned image; and

another subsystem operatively connected to said structure comprising:
a receiving component capable of receiving said modulated electromagnetic radiation emanating from said source of electromagnetic radiation and of converting received modulated electromagnetic radiation into other electrical signals; and

wherein said movable scanning subsystem moves linearly, within the device, with respect to said another subsystem.

2. The device of claim 1 wherein said source of electromagnetic radiation and said receiving component are substantially aligned in respect to each other at all times.

3. The device of claim 2 wherein said source of electromagnetic radiation and said receiving component are substantially collinear.

4. The device of claim 1 wherein said source of electromagnetic radiation comprises an antenna.

5. The device of claim 1 wherein said receiving component comprises an antenna.

6. The device of claim 1 wherein said source of electromagnetic radiation comprises an optical source and said receiving component comprises a detector.

7. The device of claim 1 wherein said electrical component comprises an imager.

8. The device of claim 1 wherein said another subsystem further comprises:
another source of electromagnetic radiation; and
another modulating component capable of modulating said another source of electromagnetic radiation; and
wherein said movable scanning subsystem further comprises another receiving component capable of receiving electromagnetic radiation emanating from said another source of electromagnetic radiation.

9. The device of claim 8 wherein said source of electromagnetic radiation and said another receiving component are the same component.

10. The device of claim 8 wherein said receiving component and said another source of electromagnetic radiation are the same component.

11. A method for transferring information related to an image from a movable scanning system in a device to another system in the device, the method comprising:
scanning an image and converting electrical signals into modulated electromagnetic radiation based on said scanning, wherein said electrical signals comprise said information related to the scanned image and said modulated electromagnetic radiation also comprises said information related to the scanned image;
propagating said modulated electromagnetic radiation between said movable scanning system and said another system;
receiving said propagated modulated electromagnetic radiation; and
converting said received modulated electromagnetic radiation into other electrical signals, wherein said other electrical signals comprise said information related to the scanned image;
wherein said movable scanning system moves linearly within the device while scanning and physically connected to a structure and said another system is also physically connected to said structure.

12. The method of claim 11 wherein said electromagnetic radiation is an optical signal.

13. A device comprising:
a subsystem operatively connected to a structure in the device, said subsystem comprising:
an electrical component capable of providing electrical signals, said electrical signals comprising information;
a source of electromagnetic radiation;
a modulating component capable of receiving said electrical signals and of modulating said source of electromagnetic radiation so as to emanate modulated electromagnetic radiation that comprises said information; and

a movable scanning subsystem configured to scan an image while moving and physically connected to said structure in the device, wherein said movable scanning subsystem moves linearly with respect to said subsystem, said movable scanning subsystem comprising:
a receiving component capable of receiving said modulated electromagnetic radiation emanating from said source of electromagnetic radiation and of converting received modulated electromagnetic radiation into other electrical signals.

14. The device system of claim 13 wherein said source of electromagnetic radiation and said receiving component are substantially aligned in respect to each other at all times.

15. The device of claim 14 wherein said source of electromagnetic radiation and said receiving component are substantially collinear.

16. The device of claim 13 wherein said source of electromagnetic radiation comprises an antenna.

17. The device of claim 13 wherein said receiving component comprises an antenna.

18. The device of claim 13 wherein said source of electromagnetic radiation comprises an optical source and said receiving component comprises a detector.

19. The device of claim 1 wherein said movable scanning subsystem comprises a roller mounted on a rail of said structure.

20. The device of claim 1 wherein said movable scanning subsystem is coupled to a lead screw driven by a motor attached to said structure.

21. The device of claim 1, wherein said movable scanning subsystem is attached to a cam follower that is moved on a cam driven by a motor attached to said structure.

22. The device of claim 1 wherein said receiving component demodulates said modulated electromagnetic radiation so as to convert said received modulated electromagnetic radiation into said other electrical signals.

23. The device of claim 4 wherein said antenna is an RF antenna.

24. The device of claim 5 wherein said antenna is an RF antenna.

25. The device of claim 1 wherein said source of electromagnetic radiation emits said electromagnetic radiation by near Field coupling.

26. The device of claim 1 wherein said receiving component receives said modulated electromagnetic radiation by near Field coupling.

27. The device of claim 6 wherein said optical source is selected from the group consisting of a laser, a laser diode and an LED.

28. A device comprising:
a movable scanning subsystem configured to scan an image while moving and physically connected to a structure in the device, said movable scanning subsystem comprising:
a means for providing electrical signals, said electrical signals comprising information related to the scanned image;
a means for generating electromagnetic radiation;
a means for receiving said electrical signals and of modulating said means for generating electromagnetic radiation so that modulated electromagnetic radiation is generated that comprises said information related to the scanned image; and

another subsystem operatively connected to said structure in the device comprising:
a means for receiving said modulated electromagnetic radiation emanating from said source of electromagnetic radiation and of converting received modulated electromagnetic radiation into other electrical signals, wherein said movable scanning subsystem moves linearly with respect to said another subsystem.

29. The device of claim 28 wherein said means for generating electromagnetic radiation and said means for receiving said modulated electromagnetic radiation are substantially aligned in respect to each other.

30. The device of claim 29 wherein said means for generating electromagnetic radiation and said means for receiving said modulated electromagnetic radiation are substantially collinear.

31. The device of claim 28 further comprising a means for moving said movable scanning subsystem.

32. A device comprising:
a subsystem operatively connected to a structure in the device, said subsystem comprising:
a means for providing electrical signals, said electrical signals comprising information;
a means for generating electromagnetic radiation;
a means for receiving said electrical signals and of modulating said means for generating electromagnetic radiation so that modulated electromagnetic radiation is generated that comprises said information; and

a movable scanning subsystem configured to scan an image operatively while moving and physically connected to said structure in the device, wherein said movable scanning subsystem moves linearly with respect to said subsystem, said movable scanning subsystem comprising:
a means for receiving said modulated electromagnetic radiation emanating from said source of electromagnetic radiation and of converting received modulated electromagnetic radiation into other electrical signals.

33. The device of claim 32 wherein said means for generating electromagnetic radiation and said means for receiving said modulated electromagnetic radiation are substantially aligned in respect to each other.

34. The device of claim 33 wherein said means for generating electromagnetic radiation and said means for receiving said modulated electromagnetic radiation are substantially collinear.