1. A monitoring device for a railway vehicle, the vehicle including at least one rotating part and at least one bearing, the device comprising:
an electronic unit configured to attach to the at least one rotating part and including a transducer configured to detect and evaluate at least one parameter, the at least one parameter relating to at least one of rotation of the rotating part and vibration of the bearing, and configured to emit signals representative of the detected and evaluated parameter;
wherein the electronic unit is positioned inside an end cap such that the electronic unit is located completely within an inner wall of the end cap, the end cap being configured to secure the electronic unit outside the rotating part and prevent the positioning of the electronic unit within any recess in the rotating part.
2. The device as claimed in claim 1, wherein a wheel axle includes the at least one bearing on an end thereon.
3. The device as claimed in claim 2, wherein the end cap has a side facing an axle end and a recess extending into the side and the electronic unit is disposed in the recess.
4. The device as claimed in claim 1, wherein the end cap has an inspection opening extending through the end cap and positioned in alignment with a signal means arranged inside the electronic unit.
5. The device as claimed in claim 4, wherein the electronic unit further includes a protective plug configured to detachably close the inspection opening in the end cap.
6. The device as claimed in claim 4, wherein the electronic unit includes an electronic capsule positioned outside of the end cap and a safety washer for retaining the position of the capsule.
7. The device as claimed in a claim 4, wherein the electronic capsule is connected with one of the washer and the end cap.
8. The device as claimed in claim 1, wherein the transducer is adapted to detect temperature.
9. The device as claimed in claim 1, wherein the electronic unit includes analyzing means for evaluating at least one of speed, total mileage run, vibration related to bearing performance, vibration related to wheel condition, bearing operating temperature and structural vibrations.
10. The device as claimed in claim 1, wherein the device includes at least one of a battery, a power generator, and an energy transforming device for powering the electronic unit.
11. The device as claimed in claim 1, wherein the device includes signal means for emitting signals representative of a condition of one of the rotating part and the bearing.
12. The device as claimed in claim 11, wherein the signal means includes at least one light emitting diode.
13. The device as claimed in claim 11, wherein the signal means are configured to emit optical codes readable by a probe.
14. The device as claimed in claim 11, wherein the signal means are configured to wirelessly transmit the signals.
15. A monitoring device for a railway vehicle, the vehicle including at least one rotating part and at least one bearing, the device comprising:
an electronic unit configured to attach to the at least one rotating part and including a transducer configured to detect and evaluate at least one parameter, the at least one parameter relating to at least one of rotation of the rotating part and vibration of the bearing, and configured to emit signals representative of the detected and evaluated parameter;
wherein the electronic unit is positioned in a box located on a wheel axle of the vehicle, the box in which the electronic unit is positioned completely encloses the electronic unit such that a portion of the electronic unit does not extend outwardly from the box, the box being configured to secure the electronic unit outside the wheel axle and to prevent the positioning of the electronic unit within any recess in the wheel axle.
16. The device as claimed in claim 15, wherein the device includes signal means for emitting signals representative of a condition of one of the rotating part and the bearing.
17. The device as claimed in claim 16, wherein the signal means includes at least one light emitting diode.
18. The device as claimed in claim 15, wherein the device is powered by an energy transforming device.
19. A monitoring device for a railway vehicle, the vehicle including at least one rotating part and at least one bearing, the device comprising:
an electronic unit configured to attach to the at least one rotating part and including a transducer configured to detect and evaluate at least one parameter, the at least one parameter relating to at least one of rotation of the rotating part and vibration of the bearing, and configured to emit signals representative of the detected and evaluated parameter;
wherein the electronic unit is positioned in an enclosure positioned on the rotating part the enclosure in which the electronic unit is positioned completely encloses the electronic unit such that a portion of the electronic unit does not extend outwardly from the enclosure, the enclosure being configured to secure the electronic unit outside the rotating part and prevent the positioning of the electronic unit within any recess in the rotating part.
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 optical pickup actuator for use with a recording medium, the optical pickup actuator comprising:
a swing arm pivoting in a tracking direction with respect to the recording medium;
a first driving unit pivoting the swing arm;
an optical pickup facing the recording medium;
an elastic member having one end fixed to the swing arm and a free end portion elastically deformable in a focus direction with respect to the recording medium, wherein the optical pickup has an electrical connection and is mounted entirely on the free end portion of the elastic member; and
a second driving unit deforming and driving the elastic member;
wherein the second driving unit comprises:
at least one coil provided on an end of the swing arm and functioning as an electromagnet according to a supply of current; and
at least one magnet facing the at least one coil, wherein the at least one magnet is provided on the optical pickup to generate a solenoid force with the corresponding coil;
wherein the at least one magnet is provided on a surface of the optical pickup opposite of the recording medium;
wherein the at least one coil comprises a pair of coils, so that the pair of coils is symmetrically arranged at both sides with respect to a center line of the at least one magnet; and
wherein each coil of the pair of coils provides force in the same direction to provide focus control, and each coil of the pair of coils provides force in opposite directions to provide tilt control.
2. The optical pickup actuator as claimed in claim 1, wherein the elastic member has a width 10 times or more greater than a thickness of the elastic member.
3. The optical pickup actuator as claimed in claim 1, wherein the elastic member is also elastically deformable in the tracking direction.
4. The optical pickup actuator as claimed in claim 1, further comprising a wiring provided in the elastic member electrically connecting the optical pickup and a main circuit.
5. The optical pickup actuator as claimed in claim 4, wherein the elastic member further comprises:
a main body of the elastic member;
an insulation layer insulating the main body and the wiring; and
a protective layer coated on the wiring.
6. The optical pickup actuator as claimed in claim 5, wherein the main body comprises beryllium copper or stainless steel.
7. The optical pickup actuator as claimed in claim 1, wherein at least one slit is formed in the elastic member in a lengthwise direction.
8. The optical pickup actuator as claimed in claim 1, wherein the first driving unit comprises:
a coil provided at an end of the swing arm; and
a magnet generating an electromagnetic force with current flowing in the coil of the first driving unit.
9. An optical pickup actuator for use with a recording medium, the optical pickup actuator comprising:
a swing arm pivoting in a tracking direction with respect to the recording medium;
a first driving unit pivoting the swing arm;
an optical pickup facing the recording medium;
an elastic member having one end fixed to the swing arm and a free end portion elastically deformable in a focus direction with respect to the recording medium, wherein the optical pickup is coupled to the free end portion of the elastic member; and
a second driving unit deforming and driving the elastic member;
wherein the second driving unit comprises:
at least one coil provided on an end of the swing arm and functioning as an electromagnet according to a supply of current; and
at least one magnet facing the at least one coil, wherein the at least one magnet is provided on the optical pickup to generate a solenoid force with the corresponding coil; and
wherein the at least one magnet comprises a magnet provided at a surface of the optical pickup perpendicular to the recording medium.
10. The optical pickup actuator as claimed in claim 9, wherein the at least one magnet further comprises a first magnet provided on a surface of the optical pickup opposite of the recording medium; and
wherein the magnet provided at a surface of the optical pickup perpendicular to the recording medium is a second magnet.
11. The optical pickup actuator as claimed in claim 10, wherein the at least one coil facing the first magnet comprises a pair of coils, so that the pair of coils are symmetrically arranged at both sides with respect to a center line of the first magnet.
12. The optical pickup actuator as claimed in claim 10, further comprising a third magnet provided at a surface of the optical pickup opposite of the second magnet.
13. The optical pickup actuator as claimed in claim 12, wherein the at least one coil facing the first magnet comprises a pair of coils, so that the pair of coils are symmetrically arranged at both sides with respect to a center line of the first magnet.
14. The optical pickup actuator as claimed in claim 1, wherein the elastic member is a leaf spring.