1. A method of refining boron-containing silicon using an electron beam comprising:
irradiating boron-containing silicon in a vacuum chamber with an electron beam and melting the boron-containing silicon with the electron beam without performing plasma heating to form molten silicon;
introducing into the vacuum chamber a boron compound-forming substance which bonds with boron in the molten silicon and forms a boron compound; and
stopping the irradiation with the electron beam after at least a portion of the boron compound has vaporized.
2. A method as claimed in claim 1 wherein irradiation with the electron beam is stopped no later than when the boron concentration of the molten silicon has become a minimum.
3. A method as claimed in claim 1 wherein the boron compound-forming substance is an oxygen-containing substance which oxidizes boron contained in the molten silicon and changes it into a boron oxide.
4. A method as claimed in claim 3 wherein the oxygen-containing substance is selected from H2O and a mixture of hydrogen gas and oxygen gas.
5. A method as claimed in claim 1 including previously performing a trial run to determine the length of time for the boron concentration of molten silicon to reach a minimum, wherein stopping the irradiation with the electron beam is performed upon the passage of a length of time no greater than the length of time determined in the trial run.
6. A method as claimed in claim 1 comprising introducing water vapor into the vacuum chamber as the boron compound-forming substance.
7. A method as claimed in claim 6 including introducing the water vapor into the vacuum chamber with the water vapor at a temperature of at least 80\xb0 C.
8. A method as claimed in claim 1 including introducing the boron compound-forming substance into the vacuum chamber while melting the boron-containing silicon with the electron beam.
9. A method as claimed in claim 1 including stopping irradiation with the electron beam no later than when the silicon is completely melted by the electron beam.
10. A method as claimed in claim 1 including irradiating the boron-containing silicon with the electron beam using an electron gun.
11. A method as claimed in claim 1 including creating a vacuum of approximately 10\u22123 Pa within the vacuum chamber.
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 door interlock unit to be used with a disk recordingreproducing apparatus, the apparatus including a front panel having an opening, a disk tray which is movable between a first position at which the disk tray is ejected out of the front panel through the opening and a second position at which the disk tray is inserted into the front panel, a door pivotally installed to the front panel to rotate between an open position to open the opening and a closed position to close the opening, and an elastic member to apply an elastic force to rotate the door to the closed position, the door interlock unit comprising:
at least one member to prevent the door from being forcibly opened;
wherein the at least one member selectively restricts the rotation of the door according to a position of the disk tray; and
selectively restricts movement of the disk tray according to a position of the door.
2. The door interlock unit as claimed in claim 1, wherein the at least one member restricts the rotation of the door to the open position in response to the disk tray being positioned at the second position, and restricts movement of the disk tray to the second position in response to the door being positioned at the open position.
3. The door interlock unit as claimed in claim 2, wherein the at least one member comprises:
a first opening prevention member being movable between a protruded position at which the first opening prevention member protrudes outward from a longitudinal edge of the disk tray and a retracted position at which the first opening prevention member is retracted so as not to protrude from the longitudinal edge of the disk tray, the first opening prevention member moving in cooperation with movement of the disk tray moving between the first position and the second position; and
a second opening prevention member being movable between a blocking position on a moving path of the first opening prevention member and an unblocking position out of the moving path of the first opening prevention member, the second opening prevention member moving in cooperation with movement of the door between the open position and closed position;
wherein the first opening prevention member does not move to the protruded position to prevent the disk tray from being moved in response to the second opening prevention member being positioned at the blocking position; and
the second opening prevention member does not move to the blocking position to prevent the door from being rotated in response to the first opening prevention member being positioned at the protruded position.
4. The door interlock unit as claimed in claim 3, further comprising:
a pickup base with a provided turntable; and
a lift guide to lift the pickup base;
wherein the first opening prevention member comprises an extension element protruding from the lift guide in a direction perpendicular to a moving direction of the disk tray.
5. The door interlock unit as claimed in claim 4, wherein the second opening prevention member comprises a blocking element on one side of the door, the blocking element being at approximately a right angle relative to the extension element.
6. The door interlock unit as claimed in claim 5, wherein the blocking element comprises:
a blocking surface, formed in a direction perpendicular to the moving direction of the extension element, to block movement of the extension element to the protruded position in response to the blocking element being positioned at the blocking position; and
a hook surface, formed in parallel with the moving direction of the extension element and abutting against the extension element, to restrict movement of the blocking element to the blocking position in response to the extension element being positioned at the protruded position.
7. The door interlock unit as claimed in claim 5, wherein the elastic member comprises an extension spring having one end supported by the blocking element and a second end supported by the front panel.
8. The door interlock unit as claimed in claim 3, further comprising a reinforcing member provided to the front panel to support andor reinforce the second opening prevention member.
9. The door interlock unit as claimed in claim 8, wherein the reinforcing member supports the second opening prevention member in response to the first opening prevention member attempting to move to the protruded position and contacting the second opening prevention member while the second opening prevention member is positioned at the blocking position.
10. The door interlock unit as claimed in claim 8, wherein the reinforcing member is provided as a rib extending from the front panel.
11. The door interlock unit as claimed in claim 4, wherein the extension element is a bar protruding from the lift guide.
12. The door interlock unit as claimed in claim 5, wherein the blocking element is a wing provided on the one side of the door.
13. A disk recordingreproducing apparatus comprising:
a front panel assembly comprising a front panel having an opening, a door pivotally installed to the front panel to rotate between an open position to open the opening and a closed position to close the opening, and an elastic member applying an elastic force to the door to rotate the door to the closed position;
a body comprising a disk tray which is movable between a first position at which the disk tray is ejected out of the front panel through the opening and a second position at which the disk tray is inserted into the front panel, and a lift guide to lift a pickup base with a turntable installed thereon; and
a door interlock unit comprising:
at least one member to prevent the door from being forcibly opened,
wherein the at least one member selectively restricts the rotation of the door according to a position of the disk tray, and
selectively restricts movement of the disk tray according to a position of the door.
14. The disk recordingreproducing apparatus as claimed in claim 13, wherein the at least one member restricts the rotation of the door to the open position in response to the disk tray being positioned at the second position, and restricts movement of the disk tray to the second position in response to the door being positioned at the open position.
15. The disk recordingreproducing apparatus as claimed in claim 14, wherein the at least one member comprises:
a first opening prevention member being movable between a protruded position at which the first opening prevention member protrudes outward from a longitudinal edge of the disk tray and a retracted position at which the first opening prevention member is retracted so as not to protrude from the longitudinal edge of the disk tray, the first opening prevention member moving in cooperation with movement of the disk tray moving between the first position and the second position; and
a second opening prevention member being movable between a blocking position on a moving path of the first opening prevention member and an unblocking position out of the moving path of the first opening prevention member, the second opening prevention member moving in cooperation with movement of the door between the open position and closed position;
wherein the first opening prevention member does not move to the protruded position to prevent the disk tray from being moved in response to the second opening prevention member being positioned at the blocking position; and
the second opening prevention member does not move to the blocking position to prevent the door from being rotated in response to the first opening prevention member being positioned at the protruded position.
16. The disk recordingreproducing apparatus as claimed in claim 15, wherein the first opening prevention member comprises an extension element protruding from the lift guide in a direction perpendicular to a moving direction of the disk tray.
17. The disk recordingreproducing apparatus as claimed in claim 16, wherein the second opening prevention member comprises a blocking element on one side of the door, the blocking element being at approximately a right angle relative to the extension element.
18. The disk recordingreproducing apparatus as claimed in claim 17, wherein the blocking element comprises:
a blocking surface, formed in a direction perpendicular to the moving direction of the extension element, to block movement of the extension element to the protruded position in response to the blocking element being positioned at the blocking position; and
a hook surface, formed in parallel with the moving direction of the extension element and abutting against the extension element, to restrict movement of the blocking element to the blocking position in response to the extension element being positioned at the protruded position.
19. The disk recordingreproducing apparatus as claimed in claim 17, wherein the elastic member comprises an extension spring having one end supported by the blocking element and a second end supported by the front panel.
20. The disk recordingreproducing apparatus as claimed in claim 15, the door interlock unit further comprising a reinforcing member provided to the front panel to support andor reinforce the second opening prevention member.
21. The disk recordingreproducing apparatus as claimed in claim 20, wherein the reinforcing member supports the second opening prevention member in response to the first opening prevention member attempting to move to the protruded position and contacting the second opening prevention member while the second opening prevention member is positioned at the blocking position.
22. The disk recordingreproducing apparatus as claimed in claim 20, wherein the reinforcing member is provided as a rib extending from the front panel.
23. The disk recordingreproducing apparatus as claimed in claim 16, wherein the extension element is a bar protruding from the lift guide.
24. The disk recordingreproducing apparatus as claimed in claim 17, wherein the blocking element is a wing provided on the one side of the door.
25. A door interlock unit to be used with a disk recordingreproducing apparatus having a disk tray and a door through which the disk tray moves in and out of the disk recordingreproducing apparatus, the door interlock unit comprising:
a restricting member to restrict the door from being opened in response to the disk tray being positioned inside the disk recordingreproducing apparatus;
wherein the restricting member is engaged by the disk tray entering the disk recordingreproducing apparatus.
26. A door interlock unit to be used with a disk recordingreproducing apparatus having a disk tray and a door through which the disk tray moves in and out of the disk recordingreproducing apparatus, the door interlock unit comprising:
a restricting member to restrict the disk tray from moving toward a disk loading position in the disk recordingreproducing apparatus in response to the door being in an open position;
wherein the restricting member is coupled to the door so as to be engaged and disengaged by the door opening and closing, respectively.