1. A charging device mounted on a frame, the charging device comprising:
a pair of mounting members mounted and fixed on both end portions of the frame;
a discharging electrode filament extending between the mounting members in a tensioned state;
a shield casing arranged to cover the discharging electrode filament by being supported between the mounting members and connected with the mounting members;
a grid extending between the mounting members in a tensioned state and arranged in an opening of the shield casing;
at least one connecting member arranged to connect the pair of the mounting members and the shield casing in a state in which a slight displacement between the mounting members and the shield casing is permitted; and
a plate-shaped swinging member arranged to connect the grid to at least one of the mounting members in the tensioned state and to swing about a pin.
2. The charging device according to claim 1, wherein the at least one connecting member includes a catching pin and a catching hole arranged on the mounting members and the shield casing to loosely connect with one another.
3. The charging device according to claim 2, further comprising a spring tensioning the grid in its longitudinal direction with respect to the mounting members through the swinging portion.
4. The charging device according to claim 2, wherein the discharging electrode filament is a thin band-shaped metal plate including a plurality of electrodes.
5. The charging device according to claim 2, wherein the pair of the mounting members, the discharging electrode filament, the shield casing, and the grid are unitized so as to define a single unitary structural element.
6. The charging device according to claim 2, wherein a diameter of the catching hole is slightly larger than a diameter of the catching pin.
7. The charging device according to claim 2, wherein the catching hole is oval.
8. A photoconductive drum unit comprising:
a frame;
a photoconductive drum rotatably supported on the frame; and
a charging unit arranged to face a surface of the photoconductive drum, and mounted and fixed at both end portions of the frame to be arranged along a longitudinal direction of the photoconductive drum; wherein
the charging unit includes:
a pair of mounting members mounted and fixed on the end portions of the frame;
a discharging electrode filament extending between the mounting members in a tensioned state;
a shield casing arranged to cover the discharging electrode filament by being supported between the mounting members and connected with the mounting members;
a grid extending between the mounting members in a tensioned state and arranged in an opening of the shield casing;
at least one connecting member arranged to connect the pair of the mounting members and the shield casing in a state in which a slight displacement between the mounting members and the shield casing is permitted; and
a plate-shaped swinging member arranged to connect the grid to at least one of the mounting members in the tensioned state and to swing about a pin.
9. The photoconductive drum unit according to claim 8, wherein the at least one connecting member includes a catching pin and a catching hole arranged on the mounting members and the shield casing to loosely connect with one another.
10. The photoconductive drum unit according to claim 9, further comprising a spring which tensions the grid in its longitudinal direction with respect to the mounting members through the swinging portion.
11. The photoconductive drum unit according to claim 9, wherein the discharging electrode filament is a thin band-shaped metal plate including a plurality of needle-like electrodes.
12. The photoconductive drum unit according to claim 9, wherein the pair of the mounting members, the discharging electrode filament, the shield casing, and the grid are unitized so as to define a single unitary structural element.
13. The photoconductive drum unit according to claim 9, wherein a diameter of the catching hole is slightly larger than a diameter of the catching pin.
14. The photoconductive drum unit according to claim 9, wherein the catching hole is oval.
15. An image forming device comprising:
a photoconductive drum unit including a photoconductive drum and a charging unit; and
a developing device unit which includes a toner container and a developing roller; wherein
the photoconductive drum unit includes:
a frame;
the photoconductive drum rotatably supported on the frame; and
a charging unit arranged to face a surface of the photoconductive drum, and mounted and fixed at both end portions of the frame to be arranged along a longitudinal direction of the photoconductive drum; wherein
the charging unit includes:
a pair of mounting members mounted and fixed on the end portions of the frame;
a discharging electrode filament extending between the mounting members in a tensioned state;
a shield casing arranged to cover the discharging electrode filament by being supported between the mounting members and connected with the mounting members;
a grid extending between the mounting members in a tensioned state and arranged in an opening of the shield casing;
at least one connecting member arranged to connect the pair of the mounting members and the shield casing in a state in which a slight displacement between the mounting members and the shield casing is permitted; and
a plate-shaped swinging member arranged to connect the grid to at least one of the mounting members in the tensioned state and to swing about a pin.
16. The image forming device according to claim 15, wherein the connecting member includes a catching pin and a catching hole arranged on the mounting members and the shield casing to loosely connect with one another.
17. The image forming device according to claim 16, further comprising a spring which tensions the grid in its longitudinal direction with respect to the mounting members through the swinging portion.
18. The image forming device according to claim 16, wherein the discharging electrode filament is a thin band-shaped metal plate including a plurality of needle-like electrodes.
19. The image forming device according to claim 16, wherein the pair of the mounting members, the discharging electrode filament, the shield casing, and the grid are unitized so as to define a single unitary structural element.
20. The image forming device according to claim 16, wherein a diameter of the catching hole is slightly larger than a diameter of the catching pin.
21. The image forming device according to claim 16, wherein the catching hole is oval.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A communication device for transmitting orthogonal frequency division multiplexed (OFDM) signals in a wireless communication system, the communication device comprising:
means for transmitting said OFDM signals to a receiver via plurality of transmission channels wherein each of said OFDM signals comprises a plurality of subcarrier signals; and
means for generating weight coefficients that are applied to each of said plurality of subcarrier signals and for controlling an amplitude andor phase of said plurality of subcarrier signals as a function of said weight coefficients,
wherein said weight coefficients are chosen to improve performance of a total of combined OFDM signals at the receiver.
2. The communication device of claim 1, wherein the means for generating controls an amplitude andor phase of each of said plurality of subcarrier signals individually as a function of said weight coefficients.
3. The communication device of claim 1, wherein the performance of the total combined OFDM signals is expressed by said weight coefficients and a Hermitial matrix having elements of channel vectors, and the weight coefficients are chosen based on an Eigenvector of an Eigenvalue of said Hermitian matrix.
4. The communication device of claim 3, wherein said Eigenvalue of said Hermitian matrix is maximum Eigenvalue of said Hermitian matrix.
5. A communication device for transmitting orthogonal frequency division multiplexed (OFDM) signals in a wireless communication system, the communication device comprising:
a plurality of antenna elements configured to transmit said OFDM signals to a receiver via a plurality of transmission channels in said wireless communication system wherein each of said OFDM signals comprises a plurality of subcarrier signals; and
a processor configured to generate weight coefficients that are applied to each of said plurality of subcarrier signals and to control an amplitude andor phase of said plurality of subcarrier signals as a function of said weight coefficients,
wherein said weight coefficients are chosen to improve performance of a total of combined OFDM signals at the receiver.
6. The communication device of claim 5, wherein the processor is configured to control an amplitude andor phase of each of said plurality of subcarrier signals individually as a function of said weight coefficients.
7. The communication device of claim 5, wherein the performance of the total combined OFDM signals is expressed by said weight coefficients and a Hermitial matrix having elements of channel vectors, and the weight coefficients are chosen based on an Eigenvector of an Eigenvalue of said Hermitian matrix.
8. The communication device of claim 7, wherein said Eigenvalue of said Hermitian matrix is maximum Eigenvalue of said Hermitian matrix.
9. A method performed by a communication device for transmitting orthogonal frequency division multiplexed (OFDM) signals in a wireless communication system, the method comprising:
transmitting, from a plurality of antenna elements of said communication device, said OFDM signals to a receiver via plurality of transmission channels wherein each of said OFDM signals comprises a plurality of subcarrier signals;
generating, at a processor of said communication device, weight coefficients that are applied to each of said plurality of subcarrier signals; and
controlling, at said processor, an amplitude andor phase of said plurality of subcarrier signals as a function of said weight coefficients, wherein said weight coefficients are chosen to improve performance of a total of combined OFDM signals at the receiver.
10. The method of claim 9, wherein the controlling includes controlling an amplitude andor phase of each of said plurality of subcarrier signals individually as a function of said weight coefficients.
11. The method of claim 9, wherein the performance of the total combined OFDM signals is expressed by said weight coefficients and a Hermitial matrix having elements of channel vectors, and the weight coefficients are chosen based on an Eigenvector of an Eigenvalue of said Hermitian matrix.
12. The method of claim 11, wherein said Eigenvalue of said Hermitian matrix is maximum Eigenvalue of said Hermitian matrix.
13. A communication device for transmitting orthogonal frequency division multiplexed (OFDM) signals in a wireless communication system, the communication device comprising:
means for transmitting said OFDM signals to a receiver via a plurality of transmission channels in said wireless communication system;
means for obtaining channel information regarding phase shift properties of OFDM subcarrier signals transmitted through said plurality of transmission channels; and
means for controlling a phase of said OFDM subcarrier signals in accordance with said channel information to improve the performance the total combined OFDM subcarrier signals at the receiver.
14. The communication device of claim 13, wherein the means for controlling controls a phase of each of said OFDM subcarrier signals in accordance with said channel information to improve the performance the total combined OFDM subcarrier signals at the receiver.
15. A communication device for transmitting orthogonal frequency division multiplexed (OFDM) signals in a wireless communication system, the communication device comprising:
a plurality of antenna elements configured to transmit said OFDM signals to a receiver via a plurality of transmission channels in said wireless communication system;
a processor configured to obtain channel information regarding phase shift properties of OFDM subcarrier signals transmitted through said plurality of transmission channels, and control a phase of said OFDM subcarrier signals in accordance with said channel information to improve performance of total of combined OFDM subcarrier signals at the receiver.
16. The communication device of claim 15, wherein the processor is configured to control a phase of each of said OFDM subcarrier signals in accordance with said channel information to improve the performance the total combined OFDM subcarrier signals at the receiver.
17. A method performed at a communication device for transmitting orthogonal frequency division multiplexed (OFDM) signals in a wireless communication system, the method comprising:
transmitting, from a plurality of antenna elements at said communication device, said OFDM signals to a receiver via a plurality of transmission channels in said wireless communication system;
obtaining, at a processor of said communication device, channel information regarding phase shift properties of OFDM subcarrier signals transmitted through said plurality of transmission channels; and
controlling, at said processor of said communication device, a phase of said OFDM subcarrier signals in accordance with said channel information to improve the performance the total combined OFDM subcarrier signals at the receiver.
18. The method of claim 17, wherein the controlling includes controlling a phase of each of said OFDM subcarrier signals in accordance with said channel information to improve the performance the total combined OFDM subcarrier signals at the receiver.