1. A protected substrate, comprising a substrate composed of glass or ceramic,
a thin film coating that imparts a hydrophilic character to said substrate on at least one part of a face of said substrate,
a mastic comprising silicone on at least a part of a periphery of said substrate; and
on a surface of the thin film coating positioned near the periphery as a barrier to migration of the silicone of the mastic, an elastomeric barrier comprising a silyl-terminated polyether.
2. The substrate of claim 1, wherein the thin film coating comprises at least partially crystalline titanium oxide.
3. The substrate of claim 2, wherein the at least partially crystalline titanium oxide is titanium dioxide in anatase form.
4. The substrate of claim 1, wherein the silyl-terminated polyether does not comprise a silicone plasticizer.
5. The substrate of claim 1, wherein the silyl-terminated polyether is in the form of a bead.
6. The substrate of claim 5, wherein the elastomer barrier comprising the silyl-terminated polyether is in direct contact with the mastic comprising silicone.
7. A protected substrate composed of glass or ceramic, comprising
a substrate,
a thin film coating that imparts a hydrophilic character to said substrate on at least one part of a face of said substrate,
a mastic comprising silicone on at least a part of a periphery of said substrate; and
a groove or notch positioned near the periphery that acts as a barrier to migration of the silicone of the mastic onto the thin film coating.
8. The substrate of claim 7, wherein the thin film coating comprises at least partially crystalline titanium oxide.
9. The substrate of claim 8, wherein the at least partially crystalline titanium oxide is titanium dioxide in anatase form.
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 disk device, comprising:
an optical pickup that reads information recorded on an optical disk;
a stepping motor that moves the optical pickup in a radial direction of the optical disk;
a driving current supplying unit that supplies a driving current to drive the stepping motor, and executes selectively a full step drive and a microstep drive;
a full step drive deciding unit that determines, during the full step drive, a time period during which the optical pickup traverses a predetermined distance in the radial direction of the optical disk;
a drive controlling unit that executes drive control of the stepping motor by changing the driving current applied in the microstep drive based on the time period; and
a driving current changing unit that changes the driving current applied in the full step drive;
wherein the driving current changing unit changes stepwise a current amplitude of the driving current applied in the full step drive.
2. The optical disk device according to claim 1, further comprising:
a normal driving current amplitude deciding unit that decides a current amplitude value of the driving current in which a feeding operation in the full step drive is normally executed; and
wherein the driving current supplying unit supplies an intermittent driving current at a predetermined time width to the stepping motor in executing the microstep drive, and
wherein the drive controlling unit changes a supply time width of the driving current in response to the current amplitude value of the driving current.
3. An optical disk device, comprising:
an optical pickup that reads information recorded on an optical disk;
a stepping motor that moves the optical pickup in a radial direction of the optical disk;
a driving current supplying unit that supplies a driving current to drive the stepping motor, executes selectively a full step drive and a microstep drive, and supplies an intermittent driving current at a predetermined time width to the stepping motor in executing the microstep drive;
a driving current changing unit that changes a pulse rate of the driving current applied in the full step drive;
a full step drive deciding unit that determines, during the full step drive, a time period during which the optical pickup traverses a predetermined distance in the radial direction of the optical disk; and
a drive controlling unit that executes drive control of the stepping motor by changing a supply time width of the driving current applied in the microstep drive based on the time period;
wherein the driving current changing unit changes stepwise the pulse rate of the driving current in executing the full step drive.
4. The optical disk device according to claim 3, further comprising:
a normal drive pulse rate deciding unit that decides the pulse rate of the driving current such that a feeding operation is normally executed in the full step drive; and
wherein the drive controlling unit changes the supply time width of the driving current in response to the pulse rate of the driving current.
5. The optical disk device according to claim 3, further comprising:
an optical pickup position sensing unit that senses whether or not a movement of the optical pickup to a predetermined position of an inner circumference of the optical disk is completed; and
a moving complete pulse rate deciding unit that decides the pulse rate of the driving current such that the movement of the optical pickup to the predetermined position of the inner circumference of the optical disk is completed within a predetermined time in the full step drive,
wherein the drive controlling unit changes the supply time width of the driving current in response to the pulse rate of the driving current.