초록 ▼

A first transmitting device is used to transmit a first signal on a first carrier frequency to a relay device. The relay device receives the signal by demodulating the first carrier frequency. Subsequently, the relay device retransmits the signal by modulating a second and/or a third carrier frequen

A first transmitting device is used to transmit a first signal on a first carrier frequency to a relay device. The relay device receives the signal by demodulating the first carrier frequency. Subsequently, the relay device retransmits the signal by modulating a second and/or a third carrier frequency. The signal is then recovered at one or more receiving devices by demodulating the second and/or third carrier frequencies. Further, a second transmitting device transmits a second signal on a fourth carrier frequency and the relay device retransmits the signal by modulating a fifth and/or a sixth carrier frequency. The signal is then recovered at one or more receiving devices by demodulating the fifth and/or sixth carrier frequencies. The transmitting and/or receiving devices are preferably voice terminals, such as a wireless telephones or data terminals, such as portable computers. The transmitting and/or receiving devices are optionally coupled to a communications network, such as a public switched telephone network or the Internet. The relay device is preferably a multiple beam satellite and/or a ground station covering several distinct geographical regions.

대표청구항 ▼

A first transmitting device is used to transmit a first signal on a first carrier frequency to a relay device. The relay device receives the signal by demodulating the first carrier frequency. Subsequently, the relay device retransmits the signal by modulating a second and/or a third carrier frequen

A first transmitting device is used to transmit a first signal on a first carrier frequency to a relay device. The relay device receives the signal by demodulating the first carrier frequency. Subsequently, the relay device retransmits the signal by modulating a second and/or a third carrier frequency. The signal is then recovered at one or more receiving devices by demodulating the second and/or third carrier frequencies. Further, a second transmitting device transmits a second signal on a fourth carrier frequency and the relay device retransmits the signal by modulating a fifth and/or a sixth carrier frequency. The signal is then recovered at one or more receiving devices by demodulating the fifth and/or sixth carrier frequencies. The transmitting and/or receiving devices are preferably voice terminals, such as a wireless telephones or data terminals, such as portable computers. The transmitting and/or receiving devices are optionally coupled to a communications network, such as a public switched telephone network or the Internet. The relay device is preferably a multiple beam satellite and/or a ground station covering several distinct geographical regions. ive drum; and an exposing unit which forms an electrostatic latent image on the erased photosensitive drum; wherein said elements are provided in the developing container and form one image forming unit. 9. The apparatus of claim 8, further comprising: a cleaning blade which removes waste toner on the photosensitive drum; and a toner withdrawing container in which toner removed by the cleaning blade is stored. 10. A liquid image forming apparatus comprising: a developing portion in which a developing roller that develops an electrostatic latent image formed on a photosensitive body in a predetermined color is installed and which is maintained at a uniform level so that the developing roller is dipped at a predetermined level; an ink reservoir in which ink supplied to the developing portion is stored; and an ink supplying unit that supplies ink stored in the ink reservoir to the developing portion; wherein the developing portion and the ink reservoir are provided in one developing container, and the ink supplying unit comprises: a barrier wall dividing the developing container into the developing portion and the ink reservoir and having an opened lower part; a cylindrical casing, upper and lower parts of which are fixed between the lower part of the barrier wall and a bottom surface of the developing container, having openings at both sides formed to face the developing portion and the ink reservoir, respectively; an axis eccentric in the cylindrical casing; and a plurality of impellers, one end of each impeller being fixed on the eccentric axis. 11. The apparatus of claim 10, wherein the eccentric axis is eccentric in the cylindrical casing in a direction of the developing portion. 12. The apparatus of claim 10, wherein the impeller is formed of elastic rubber. 13. The apparatus of claim 10, wherein the impellers are rotated toward the developing portion from the ink reservoir at a portion where the impellers meet the bottom surface of the cylindrical casing. 14. The apparatus of claim 2, wherein an elastic porous material is formed on the outer surface of the ink supplying roller. 15. The apparatus of claim 4, wherein an elastic porous material is formed on the outer surface of the ink supplying roller. 16. The apparatus of claim 2, further comprising: a photosensitive drum on which an electrostatic latent image developed by the developing roller is formed; an eraser which erases an electric potential on the photosensitive drum; and an exposing unit which forms an electrostatic latent image on the erased photosensitive drum; wherein the photosensitive body and the developing roller are provided in the developing container and form one image forming unit. 17. The apparatus of claim 4, further comprising: a photosensitive drum on which an electrostatic latent image developed by the developing roller is formed; an eraser which erases an electric potential on the photosensitive drum; and an exposing unit which forms an electrostatic latent image on the erased photosensitive drum; wherein the photosensitive body and the developing roller are provided in the developing container and form one image forming unit. 18. The apparatus of claim 13, wherein the impellers are bent to be opposite to a rotation direction of the cylindrical casing. 19. The apparatus of claim 13, wherein the impellers are spaced apart from one another by a uniform interval such that a first volume within the cylindrical casing opposite to the side in which the axis is eccentric is larger than a second volume within the cylindrical casing in which the axis is eccentric, such that the difference in ink contained in the first and second volumes is ejected into the developing portion. 20. A developing unit comprising; a developing roller; an ink developing container including: a developing portion to supply ink to the developing roller; and an ink reservoir to contain excess ink, and an ink supplying unit dividing th e developing portion and the ink reservoir such that the ink supplying unit absorbs ink in the ink reservoir and ejects the absorbed ink into the developing portion to maintain the ink within the developing portion at a uniform level, wherein the ink supplying unit comprises: a supplying roller absorbing and ejecting ink; and a barrier wall compressing and expanding the supplying roller such that ink is ejected from the supplying roller when compressed and absorbed into the supplying roller when expanded. 21. The developing unit of claim 20, wherein the barrier wall is positioned in the ink developing container such that ink within the developing portion above a predetermined level passes over the barrier wall and flows back into the ink reservoir. 22. A developing unit comprising; a developing roller; an ink developing container including: a developing portion to supply ink to the developing roller; and an ink reservoir to contain excess ink, and an ink supplying unit dividing the developing portion and the ink reservoir such that the ink supplying unit absorbs ink in the ink reservoir and ejects the absorbed ink into the developing portion to maintain the ink within the developing portion at a uniform level, wherein the ink supplying unit comprises: a supplying roller absorbing and ejecting ink; a protrusion compressing and expanding the supplying roller such that ink is ejected from the supplying roller when compressed and absorbed into the supplying roller when expanded; and a barrier wall to keep ink within the developing portion at a uniform level. 23. The developing unit of claim 22, wherein the barrier wall is positioned in the ink developing container such that ink within the developing portion above a predetermined level passes over the barrier wall and flows back into the ink reservoir.