All The Claims

1. A single-phase optical current transformer comprising:
a cylindrical container;
an electric conductor being arranged inside the cylindrical container; and
a Faraday-effect element being provided on the cylindrical container;
the Faraday-effect element having two optical fibers and a mirror, each of the optical fibers being provided outside the cylindrical container, the optical fibers forming a first optical path and a second optical path respectively, each of the optical paths being provided outside the cylindrical container, each of the optical paths being placed so as to intersect with the axial direction of the electric conductor, the optical paths being maintained parallel to each other at a predetermined interval, the second optical path being provided farther from an axis of the electric conductor than the first optical path, the mirror being provided at a respective end surface of each of the optical fibers, the mirror reflecting linearly polarized light, wherein:
linearly polarized lights from the same light source are injected respectively into the optical paths formed outside the cylindrical container, and the current flowing through the electric conductor is measured based on each of the Faraday rotation angles of the linearly polarized lights which are reflected by the mirror,
a first linearly polarized light from the light source is injected into the first optical path and reflected by the mirror such that the first linearly polarized light returns along the first optical path, and
a second linearly polarized light from the light source is injected into the second optical path and reflected by the mirror such that the second linearly polarized light returns along the second optical path.
2. A single-phase optical current transformer comprising:
a cylindrical container;
an electric conductor being arranged inside the cylindrical container;
a Faraday-effect element being provided on the cylindrical container;
an installation base being secured to a part of the outer peripheral surface of the cylindrical container; and
a case being detachably secured to the installation base, the case storing the Faraday-effect element therein;
the Faraday-effect element having two optical fibers and two mirrors, each of the optical fibers being provided outside the cylindrical container, the optical fibers forming a first optical path and a second optical path respectively, each of the optical paths being provided outside the cylindrical container, each of the optical paths being placed so as to intersect with the axial direction of the electric conductor, the optical paths being maintained parallel to each other at a predetermined interval, the second optical path being farther from an axis of the electric conductor than the first optical path, each of the mirrors reflecting linearly polarized light, wherein:
linearly polarized lights from the same light source are injected respectively into the optical paths formed outside the cylindrical container, and the current flowing through the electric conductor is measured based on each of the Faraday rotation angles of the linearly polarized lights which are reflected respectively by the mirrors,
a first linearly polarized light from the light source is injected into the first optical path and reflected by a first one of the mirrors such that the first linearly polarized light returns along the first optical path, and
a second linearly polarized light from the light source is injected into the second optical path and reflected by a second one of the mirrors such that the second linearly polarized light returns along the second optical path.

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.-55. (canceled)
56. A method for preventing the unauthorized removal of a portable electronic device, comprising:
securing a remote unit to a portable electronic device; and
using a base unit that is separated from the remote unit, and the remote unit, to indicate the unauthorized removal of the portable electronic device.
57. The method of claim 56 wherein the remote unit is secured via a security slot associated with the portable electronic device.
58. The method of claim 56 wherein the portable electronic device is a computer.
59. The method of claim 56 wherein the base unit and the remote unit form a proximity detection system, and wherein the unauthorized removal of the portable electronic device is indicated if the remote unit fails to receive a periodic transmission from the base unit.
60. The method of claim 56 wherein the base unit and the remote unit form a proximity detection system, and wherein the unauthorized removal of the portable electronic device is indicated if the remote unit and the base unit are no longer in communication.
61. The method of claim 60 wherein the portable electronic device is a computer.
62. The method of claim 56 wherein the remote unit includes a receiver or a transmitter.
63. The method of claim 56 wherein the remote unit includes a receiver and a transmitter.
64. The method of claim 56 wherein the remote unit is coupled to the portable electronic device with a T-bar.
65. The method of claim 56 wherein an attachment mechanism is used to couple the portable electronic device to the remote unit, and wherein the attachment mechanism includes a pin.
66. A proximity detection system for inhibiting theft of a portable electronic device, the system comprising:
a remote unit;
a base unit; and
an attachment mechanism coupling the remote unit to the portable electronic device;
wherein the base unit and the remote unit are separated from each other and operate together to indicate the unauthorized removal of the portable electronic device.
67. The system of claim 66 wherein a unique ID code is transmitted between the base unit and the remote unit when the proximity detection system is used.
68. The system of claim 66 wherein the attachment mechanism comprises a shaft and a crossmember at an end of the shaft.
69. The system of claim 66 wherein attachment mechanism comprises a member that is capable of rotating between a locked position and an unlocked position.
70. The system of claim 66 wherein the base unit is capable of periodically transmitting a signal to the remote unit.
71. The system of claim 66 further wherein the attachment mechanism comprises a key-actuated lock mechanism.
72. The system of claim 66 wherein the remote unit comprises a siren.
73. The system of claim 66 wherein the remote unit comprises a transmitter.
74. The system of claim 66 wherein the remote unit is capable of activating a siren if the unauthorized removal of the portable electronic device has taken place.
75. The system of claim 66 further comprising the portable electronic device.

1. An optical pickup comprising:
a laser light source;
an objective lens focusing a light beam emitted from said laser light source;
a lens holder having said objective lens, a focus coil and a tracking coil;
magnets driving said focus coil and the tracking coil;
a magnet fixing member fixing said magnets;
a unit base supporting said lens holder; and
a casing holding said unit base,
wherein one end of an elastic member is connected to said unit base, and the other end of said elastic member is connected to said magnet fixing member at point symmetrical positions on the basis of a center of said objective lens.
2. An optical pickup as claimed in claim 1, wherein said magnet, and the focus coil or the tracking coil provided in said lens holder are arranged at substantially point symmetrical positions on the basis of the center of said objective lens so as to face to the other magnet, and the focus coil or the tracking coil, and a connecting position between a suspension supporting said lens holder and said lens holder is arranged at substantially point symmetrical positions on the basis of the center line of said focus coil or the tracking coil facing to each other.
3. An optical disc apparatus comprising:
the optical pickup as claimed in claim 1;
an optical pickup feeding mechanism moving said pickup in a radial direction of said disc-like recording medium;
a disc motor for attaching said disc-like recording medium thereto and rotating said disc-like medium;
a chassis mounting said optical pickup, said optical pickup feeding mechanism and said disc motor; and
an electric circuit having a signal processing system and a control system.
4. An optical disc apparatus comprising:
the optical pickup as claimed in claim 2;
an optical pickup feeding mechanism moving said pickup in a radial direction of said disc-like recording medium;
a disc motor for attaching said disc-like recording medium thereto and rotating said disc-like medium;
a chassis mounting said optical pickup, said optical pickup feeding mechanism and said disc motor; and
an electric circuit having a signal processing system and a control system.
5. An optical pickup comprising:
a laser light source;
an objective lens focusing a light beam emitted from said laser light source on an information recording medium;
a lens holder having said objective lens, a focus coil and a tracking coil;
magnets driving said focus coil and the tracking coil;
a magnet fixing member fixing said magnets;
a unit base supporting said lens holder;
a casing holding said unit base; and
the optical pickup being used in an optical disc apparatus,
wherein one end of an elastic member is connected to said unit base, and the other end of said elastic member is connected to said magnet fixing member at an opposite position to ore end of said elastic member with respect to an axis passing through a center of rotation of said information recording medium and an optical axis of said objective lens.
6. An optical pickup as claimed in claim 5, wherein said magnet, and the focus coil and the tracking coil provided in said lama holder are arranged at line symmetrical positions with respect to the axis passing through the center of rotation of said information recording medium and the optical axis of said objective lens, and a connecting position between a suspension supporting said lens holder and said lens holder is arranged on said axis.
7. An optical disc apparatus comprising:
the optical pickup as claimed in claim 5;
an optical pickup feeding mechanism moving said pickup in a radial direction of said disc-like recording medium;
a disc motor for attaching said disc-like recording medium thereto and rotating said disc-like medium;
a chassis mounting said optical pickup, said optical pickup feeding mechanism and said disc motor; and
an electric circuit having a signal processing system and a control system.

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. An input device, comprising:
a substrate;
a mouse unit provided on the substrate;
a keyboard unit, provided on the substrate;
a switch unit, wherein the switch unit is configured for activating the mouse unit or the keyboard unit.
2. The input device as claimed in claim 1, further comprising a cover to cover the keyboard unit when the keyboard unit is not in use; the switch unit being mounted on a lateral side of the substrate.
3. The input device as claimed in claim 2, wherein a top of the cover is formed as a curved shape.
4. The input device as claimed in claim 2, wherein the keyboard unit comprises several main keys, each main key is configured for outputting several key values displayed in rows on the surface of the main key.
5. The input device as claimed in claim 4, wherein the keyboard unit further comprises several selection keys for selecting the key values of the main keys.
6. The input device as claimed in claim 4, wherein the keyboard unit further comprises a right row selection key for selecting the right side of key values distributed in each row.
7. The input device as claimed in claim 1, wherein the keyboard unit and the mouse unit are connected to a transmission line.
8. The input device as claimed in claim 1, wherein the switch unit is a single pole double throw switch comprising a first contact, a second contact and a third contact, wherein the third contact is connected to a power supply, the first contact is connected to the mouse unit, and the second contact is connected to the keyboard unit.
9. An input device, comprising:
a keyboard unit;
a keyboard electrically connected to the keyboard unit, which comprising several keys;
a key element electrically connected to the keyboard and the keyboard unit, which comprising circuits activating by different key values;
a processor electrically connected to the key element, the keyboard and the key element, saving a character table corresponding to the key values of the key element;
an interface circuit electrically connected to the processor;
wherein when a key or a combination of keys on the keyboard is activated, the circuit of the key element corresponding to the key or the combination of keys is closed; when the processor detects the closed state of the circuit, the key value corresponding to the key or the combination of keys is confirmed in the character table by the processor, and the confirmed key value is transmitted to a computer through the interface circuit.