1. A moisture-curable, one-component polyurethane composition, which is curable with moisture in the air, and containing a main component, which will form a polyurethane resin upon curing, and additives, wherein said additives comprise one or more photocurable materials selected from the group consisting of unsaturated acrylic compounds, and a hindered amine photostabilizer.
2. The moisture-curable, one-component polyurethane composition according to claim 1, wherein said additives additionally contain a blocked amine compound which will form a primary or secondary amino group with moisture.
3. The moisture-curable, one-component polyurethane composition according to claim 1, wherein said photocurable material is an unsaturated acrylic compound.
4. The moisture-curable, one-component polyurethane composition according to claim 1, wherein said additives further contain a thixotropy endowing agent, comprising an inorganic filler treated with an organic material selected from the group consisting of fatty acids, metal salts of fatty acids, fatty acid esters, resinic acids, surface agents and polyacrylates.
5. The moisture-curable, one-component polyurethane composition according to claim 1, wherein said additives further contain a thixotropy endowing agent, comprising a polyurea compound represented by the formula:
R1(NHCON\u2014R2,\u2014R3)m
wherein R1 is a residue originated from polyisocyanate; R2 is a residue originated from a monoamine or is a hydrogen, R3 is a residue originated from a monoamine or is a hydrogen, with the proviso that only one of R2 and R3 may be the hydrogen; and m is an integer of 2 to 4.
6. The moisture-curable, one-component polyurethane composition according to claim 5, wherein said thixotropy endowing agent comprising a polyurea compound is added to the composition in the form of a paste formed by dispersing the agent in a phthalate ester compound.
7. The moisture-curable, one-component polyurethane composition according to claim 2, wherein said photocurable material is an unsaturated acrylic compound.
8. The moisture-curable, one-component polyurethane composition according to claim 2, wherein said additives further contain a thixotropy endowing agent, comprising an inorganic filler treated with an organic material selected from the group consisting of fatty acids, metal salts of fatty acids, fatty acid esters, resinic acids, surface agents and polyacrylates.
9. The moisture-curable, one-component polyurethane composition according to claim 3, wherein said additives further contain a thixotropy endowing agent, comprising an inorganic filler treated with an organic material selected from the group consisting of fatty acids, metal salts of fatty acids, fatty acid esters, resinic acids, surface agents and polyacrylates.
10. A moisture-curable, one-component polyurethane composition according to claim 2, wherein said additives further contain a thixotropy endowing agent, comprising a polyurea compound represented by the formula:
R1(NHCON\u2014R2,\u2014R3)m
wherein R1 is a residue originated from polyisocyanate; R2 is a residue originated from a monoamine or is a hydrogen, R3 is a residue originated from a monoamine or is a hydrogen, with the proviso that only one of R2 and R3 may be the hydrogen; and m is an integer of 2 to 4.
11. A moisture-curable, one-component polyurethane composition according to claim 3, wherein said additives further contain a thixotropy endowing agent, comprising a polyurea compound represented by the formula:
R1(NHCON\u2014R2,\u2014R3)m
wherein R1 is a residue originated from polyisocyanate; R2 is a residue originated from a monoamine or is a hydrogen, R3 is a residue originated from a monoamine or is a hydrogen, with the proviso that only one of R2 and R3 may be the hydrogen; and m is an integer of 2 to 4.
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 disc apparatus for recording information onto an optical disc, comprising:
a laser light source for emitting a laser beam;
an objective lens for converging said laser beam and irradiating onto said optical disc;
optical detecting module which has said laser light source and said objective lens and optically reads the information recorded on said optical disc;
signal generation module for generating a focusing error signal by using an output of said optical detecting module;
recording control module for controlling the recording of the information onto said optical disc;
light emission control module for controlling the light emission of said laser light source in accordance with an output of said recording control module;
focus control module for allowing a light spot of said laser beam to execute a tracking operation to a recording surface of said optical disc by using said focusing error signal;
address detecting module for detecting an address of said optical disc by using an output of said optical detecting module;
address storing module for storing a predetermined address which is located before a recording start address by a predetermined offset;
comparing module for comparing the address which is outputted by said address detecting module with said predetermined address;
bias calculating module for calculating a bias level in accordance with a recording power; and
defocus control module for generating a predetermined defocus amount in said tracking operation,
wherein when said comparing module detects that the address which is outputted by said address detecting module coincides with said predetermined address, said defocus control module is set to generate a predetermined defocus amount in accordance with the bias level calculated by said bias calculating module.
2. The apparatus according to claim 1, wherein
when said recording control module starts the recording operation of the information, the setting of said defocus control module is changed to another setting.
3. The apparatus according to claim 1, wherein
said defocus control module is set by one time.
4. The apparatus according to claim 1, wherein
said defocus control module is set step by step.
5. The apparatus according to claim 1, wherein
said defocus control module is continuously set.
6. The apparatus according to claim 1, wherein said defocus control module further comprises:
first and second signal correcting module each for applying a predetermined offset signal to said focusing error signal; and
switching module for switching and outputting an output signal of said second signal correcting module when said recording control module is in a state of the recording operation and for switching and outputting an output signal of said first signal correcting module when said recording control module is in a state other than the recording operation,
and wherein said first signal correcting module is set in accordance with the bias level calculated by said bias calculating module and said focus control module executes said tracking operation by using an output of said switching module.
7. The apparatus according to claim 1, wherein said defocus control module further comprises:
first and second signal correcting module each for correcting a balance of said focusing error signal; and
switching module for switching and outputting an output signal of said second signal correcting module when said recording control module is in a state of the recording operation and for switching and outputting an output signal of said first signal correcting module when said recording control module is in a state other than the recording operation,
and wherein said first signal correcting module is set in accordance with the bias level calculated by said bias calculating module and said focus control module executes said tracking operation by using an output of said switching module.
8. The apparatus according to claim 6, further comprising
time measuring module for measuring a time,
wherein after said comparing module detected that the address which is outputted by said address detecting module coincides with said predetermined address, when an output of said time measuring module reaches a predetermined value, the setting of said first signal correcting module is returned to an original setting.
9. The apparatus according to claim 6, further comprising time measuring module for measuring a time,
wherein when an output of said time measuring module reaches a predetermined value after the recording operation to said optical disc was started, the setting of said first signal correcting module is returned to an original setting.
10. The apparatus according to claim 6, wherein
an output of said address detecting module reaches a predetermined value during the recording of the information onto said optical disc, the setting of said first signal correcting module is returned to an original setting.
11. An apparatus according to claim 6, wherein
after the recording of the information onto said optical disc was finished, the setting of said first signal correcting module is returned to an original setting.
12. The apparatus according to claim 1, wherein
said predetermined offset differs in accordance with a recording speed and a recording start address.
13. A defocus correcting method for an optical disc apparatus which records information onto an optical disc and has
a laser light source for emitting a laser beam,
an objective lens for converging said laser beam and irradiating onto said optical disc,
optical detecting module which has said laser light source and said objective lens and optically reads the information recorded on said optical disc,
signal generation module for generating a focusing error signal by using an output of said optical detecting module,
recording control module for controlling the recording of the information onto said optical disc,
light emission control module for controlling the light emission of said laser light source in accordance with an output of said recording control module,
focus control module for allowing a light spot of said laser beam to execute a tracking operation to a recording surface of said optical disc by using said focusing error signal,
address detecting module for detecting an address of said optical disc by using an output of said optical detecting module, and
defocus control module for generating a predetermined defocus amount in said tracking operation,
wherein said method comprises:
a first step of monitoring the address which is outputted by said address detecting module;
a second step of obtaining a recording power when said address coincides with a predetermined address which is located before a recording start address by a predetermined offset;
a third step of calculating a defocus amount corresponding to said recording power;
a fourth step of calculating a bias level corresponding to said defocus amount;
a fifth step of setting said defocus control module in accordance with the bias level calculated in said fourth step; and
a sixth step of instructing a start of the recording operation to said recording control module when said address coincides with said recording start address.
14. The method according to claim 13, further comprising
a seventh step of changing the setting of said defocus control module to another setting when said sixth step is executed.
15. The method according to claim 13, wherein
in said fifth step, said defocus control module is set by one time.
16. The method according to claim 13, wherein
in said fifth step, said defocus control module is set step by step.
17. The method according to claim 13, wherein
in said fifth step, said defocus control module is continuously set.
18. A method according to claim 13, wherein
said defocus control module has:
first and second signal correcting module each for applying a predetermined offset signal to said focusing error signal; and
switching module for switching and outputting an output signal of said second signal correcting module when said recording control module is in a state of the recording operation and for switching and outputting an output signal of said first signal correcting module when said recording control module is in a state other than the recording operation,
and wherein in said fifth step, said first signal correcting module is set.
19. The method according to claim 13, wherein
said defocus control module has:
first and second signal correcting module each for correcting a balance of said focusing error signal; and
switching module for switching and outputting an output signal of said second signal correcting module when said recording control module is in a state of the recording operation and for switching and outputting an output signal of said first signal correcting module when said recording control module is in a state other than the recording operation,
and wherein in said fifth step, said first signal correcting module is set.
20. The method according to claim 18, further comprising:
an eighth step of measuring an elapsed time after said address coincided with said predetermined address; and
a ninth step of returning the setting of said first signal correcting module to an original setting when said elapsed time reaches a predetermined time.
21. The method according to claim 18, further comprising:
a tenth step of measuring an elapsed time after the recording of the information onto said optical disc was started; and
an eleventh step of returning the setting of said first signal correcting module to an original setting when said elapsed time reaches a predetermined time.
22. The method according to claim 18, further comprising:
a twelfth step of obtaining the address which is detected by said address detecting module during the recording of the information onto said optical disc; and
a thirteenth step of returning the setting of said first signal correcting module to an original setting when said obtained address reaches a predetermined time.
23. The method according to claim 18, further comprising:
a fourteenth step of returning the setting of said first signal correcting module to an original setting after the recording of the information onto said optical disc was finished.
24. The method according to claim 13, wherein said predetermined offset differs in accordance with a recording speed and a recording start address.
25. A recording method of recording information onto an optical disc, wherein when switching from a reproduction to the recording, a defocus of an opposite polarity is caused so as to reduce a defocus which occurs when the recording is started.
26. An optical disc apparatus for recording information onto an optical disc, comprising:
an objective lens for converging a laser beam onto said optical disc;
an actuator for driving said objective lens;
a photodetector for detecting reflection light from said optical disc;
a focusing error signal forming unit for forming a focusing error signal on the basis of the detection of said photodetector;
a driver circuit for controlling said actuator on the basis of said focusing error signal; and
a control circuit for controlling said focusing error signal forming unit,
wherein when switching from a reproduction to the recording, said control circuit previously sets a predetermined bias level into said focusing error signal forming unit.