1. A disk drive comprising:
a head configured to read servo data on a disk at sampling frequency;
a moving mechanism configured to hold and to move said head in proximity with a recording surface of said disk;
a first peak filter with a fixed peak frequency and a variable gain configured to be inserted into a servo loop, said servo loop configured to position said head with position error signals between servo data read by said head and a target position;
an adaptive peak filter with a variable peak frequency and a variable gain configured to be inserted into said servo loop; and
a filter controller configured to control said gain of said adaptive peak filter according to said gain of said first peak filter.
2. The disk drive of claim 1, wherein said filter controller is configured to determine a maximum acceptable gain of said adaptive peak filter according to said gain of said first peak filter.
3. The disk drive of claim 1, wherein said filter controller is configured to determine, according to external vibrations, an operation selected from the group consisting of enabling said first peak filter, disabling said first peak filter, enabling said adaptive peak filter, and disabling said adaptive peak filter.
4. The disk drive of claim 3, wherein said filter controller is configured to determine, according to position error signals changing with external vibrations, an operation selected from the group consisting of enabling said first peak filter, and disabling said first peak filter.
5. The disk drive of claim 1, further comprising:
a second peak filter with a peak frequency higher than said peak frequency of said first peak filter, said second peak filter having a fixed peak frequency and a variable gain; and
a monitor peak filter with a peak frequency lower than said peak frequency of said first peak filter, said monitor peak filter configured to monitor external vibrations;
wherein said filter controller is configured to control said gain of said second peak filter according to output of said monitor peak filter.
6. The disk drive of claim 5, wherein said filter controller is configured to disable said second peak filter if said output of said monitor peak filter is over a specified value.
7. The disk drive of claim 1, further comprising:
a second peak filter with a peak frequency higher than said peak frequency of said first peak filter, said second peak filter having a fixed peak frequency and a variable gain;
wherein said filter controller is configured to control said adaptive peak filter independently of said second peak filter.
8. The disk drive of claim 1, wherein said disk drive is configured to change a data-write permissiondenial condition according to a gain selected from the group consisting of said gain of said first peak filter, and said gain of said adaptive peak filter.
9. A method for positioning a head with position error signals between servo data read by said head and a target position, said method comprising:
determining a variable gain on a servo loop and an operation selected from the group consisting of enabling a first peak filter with a fixed peak frequency, and disabling said first peak filter with said fixed peak frequency;
determining said variable gain on said servo loop and an operation selected from the group consisting of enabling a adaptive peak filter with a variable peak frequency, and disabling said adaptive peak filter with said variable peak frequency; and
controlling said gain of said adaptive peak filter according to said gain of said first peak filter if enabling both said first peak filter and said adaptive peak filter on said servo loop.
10. The method of claim 9, further comprising:
determining a maximum acceptable gain of said adaptive peak filter according to said gain of said first peak filter.
11. The method of claim 9, further comprising:
determining, according to output of said first peak filter, an operation selected from the group consisting of enabling said first peak filter, and disabling said first peak filter.
12. The method of claim 9, further comprising:
determining, according to output of a monitor peak filter with a peak frequency lower than said peak frequency of said first peak filter for monitoring external vibrations, said variable gain on said servo loop; and
determining an operation selected from the group consisting of enabling a second peak filter with a fixed peak frequency higher than said peak frequency of said first peak filter, and disabling said second peak filter with said fixed peak frequency higher than said peak frequency of said first peak filter.
13. The method of claim 12, further comprising:
disabling said second peak filter if said output of said monitor peak filter is over a specified value.
14. The method of claim 9, further comprising:
determining said variable gain on said servo loop and an operation selected from the group consisting of enabling a second peak filter with a fixed peak frequency higher than said peak frequency of said first peak filter, and disabling said second peak filter with said fixed peak frequency higher than said peak frequency of said first peak filter; and
controlling said adaptive peak filter independently of said second peak filter.
15. The method of claim 9, further comprising:
changing a data-write permissiondenial condition according to a gain selected from the group consisting of a gain of said first peak filter, and a gain of said adaptive peak filter.
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 pyrimidine azo compound represented by the following formula (I), or a tautomer thereof:
wherein in the formula (I), R1 represents a heterocyclic group; R2 represents a hydrogen atom or a substituent; R3, R4, R5, R6, R7, and R8 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylsulphonyl group, an arylsulphonyl group, or a sulfamoyl group; and R3 and R4, R5 and R6, and R7 and R8 may be mutually bonded to form a 5-, 6-, or 7-membered ring.
2. A colored curable composition comprising a dye represented by the following formula (V):
wherein, in the formula (V), R1 represents a heterocyclic group; R2 represents a hydrogen atom or a substituent; X1 represents \u2014N\u2550, or \u2014C(R3)\u2550; R3 represents a hydrogen atom or a substituent; when X1 is \u2014C(R3)\u2550, R2 and R3 may be mutually bonded to form a 5-, 6-, or 7-membered ring; R4 represents a hydrogen atom or a substituent; R5 and R6 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylsulphonyl group, an arylsulphonyl group, or a sulfamoyl group; R5 and R6 may be mutually bonded to form a 5-, 6-, or 7-membered ring; and R7 represents a hydrogen atom or a substituent.
3. A colored curable composition according to claim 2 further comprising a polymerizable monomer.
4. A colored curable composition according to claim 3, wherein the polymerizable monomer contains a (meta)acrylic ester monomer.
5. A colored curable composition according to claim 4, wherein the polymerizable monomer contains a tri- or higher-functional (meta)acrylic ester monomer.
6. A colored curable composition according to claim 2 further comprising a binder.
7. A colored curable composition according to claim 6, wherein the binder contains an alkali-soluble (meta)acrylic resin.
8. A colored curable composition according to claim 7, wherein the binder contains a (meta)acrylic resin having an alkali-soluble polymerizable side chain.
9. A colored curable composition according to claim 2 further comprising a photopolymerization initiator.
10. A colored curable composition according to claim 9; wherein the photopolymerization initiator contains at least one active halogen compound selected from a halomethyloxadiazole compound and a halomethyl-s-triazine compound, and at least one compound selected from the group consisting of a 3-aryl substituted coumarin compound, a lophine dimmer, a benzophenon compound, an acetophenon compound and derivatives thereof, a cyclopentadiene-benzene-iron complex and salts thereof, and an oxime compound.
11. A colored curable composition according to claim 9, wherein the photopolymerization initiator contains at least one compound that does not generate acids by decomposition.
12. A colored curable composition according to claim 9, wherein the photopolymerization initiator contains at least one compound selected from the group consisting of a lophine dimmer, a benzophenon compound, an acetophenon compound, an oxime compound, and a halomethyl-s-triazine compound.
13. A colored curable composition according to claim 2 further comprising a cross linking agent.
14. A color filter comprising a color layer containing at least one colored curable composition of claim 2.
15. A method of manufacturing a color filter, comprising:
coating the colored curable composition of claim 2 on a substrate, so as to form a color layer;
pattern exposing the color layer to light through a mask; and
developing the color layer to form a colored pattern.
16. A colored curable composition comprising a dye represented by the following formula (II):
wherein, in the formula (II), R1 represents a heterocyclic group; R2 represents a hydrogen atom or a substituent; R5 and R6 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylsulphonyl group, an arylsulphonyl group, or a sulfamoyl group; R5 and R6 may be mutually bonded to form a 5-, 6-, or 7-membered ring; R8, R9, R10, and R11 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylsulphonyl group, an arylsulphonyl group, or a sulfamoyl group; and R5 and R6, R8 and R9, and R10 and R11 may be mutually bonded to form a 5-, 6-, or 7-membered ring.