1. An optimal laser beam power determination method for recording information onto and reproducing information from an optical disk, comprising steps of storing a plurality of combination tables having pre-selected parameters:
performing recording tests using at least one combination from the plurality of combinations of pre-selected parameter values from at least one of a plurality of combination tables; and
determining optimal values for actual parameters from the results of the recording tests to provide optimal laser beam power.
2. The optimal laser beam power determination method as claimed in claim 1, wherein each combination table is formed in an orthogonal array of parameter values for the optimal laser beam power determination.
3. The optimal laser beam power determination method as claimed in claim 2, wherein the step for determining the optimal values determines a combination of the optimal parameter values based on first recording state information values obtained as a result of the recording tests and second recording state information values calculated from predictions of results for combinations of parameter values not included in the combination tables from the first recording state information values.
4. The optimal laser beam power determination method as claimed in claim 3, further comprising a step for deciding which kind of optical disk has been loaded into an apparatus and reading out a combination table corresponding to the decided kind of loaded optical disk before performing the recording tests, wherein the combination tables are prepared in advance and stored based on the kind of optical disk.
5. The optimal laser beam power determination method as claimed in claim 4, wherein the recording tests are performed by recording test data onto the optical disk and measuring a jitter value calculated from a reproduction signal for the recorded test data.
6. The optimal laser beam power determination method as claimed in claim 5,
wherein the step for determining the optimal values extracts a predetermined number of combinations calculated to have the least jitter value out of the second recording state values, obtains third recording state information values by performing the recording tests for the extracted combinations, and determines as the optimal combination a combination having the least jitter value out of the first recording state information values and the third recording state information values.
7. An optical disk recording and reproducing apparatus for recording and reproducing information onto and out of an optical disk, comprising:
a pickup unit for irradiating a beam onto the optical disk and recording or reproducing information;
a memory unit for storing a plurality of combination tables each formed with combinations of pre-selected values for parameters used to determine the optimal power of the beam irradiated from the pickup unit; and
a control unit for performing recording tests for each combination in the plurality of combination tables and determining an optimal power of the laser beam based on the results of the recording tests.
8. The optical disk recording and reproducing apparatus as claimed in claim 7,
wherein the plurality of combination tables are each formed in an orthogonal array of values for parameters for determining the optimal laser beam power.
9. The optical disk recording and reproducing apparatus as claimed in claim 8,
wherein the control unit determines a combination of optimal parameter values based on first recording state information values obtained as a result of the recording tests and second recording state information values calculated from combinations of parameter values not included in the combination tables from the first recording state information values.
10. The optical disk recording and reproducing apparatus as claimed in claim 9,
wherein the combination tables are prepared and stored in the memory unit by optical disk kind, and the control unit decides which kind of optical disk is loaded and reads out a combination table corresponding to the decided kind of the loaded optical disk before performing the recording tests; and
performing the recording tests for determining the optimal laser beam power.
11. The optical disk recording and reproducing apparatus as claimed in claim 10,
wherein the optimal power is determined by extracting the predetermined number of combinations predicted to have the least jitter value out of the second recording state values, obtaining third recording state information values through recording test performances for the extracted combinations, and selecting a combination having the least jitter value out of the first recording state information values and the third recording state information values.
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 device for the trenchless replacement of in-situ pipe, comprising:
a mole;
a length of cable, said cable being engagable to said mole;
a cable pulling device being releasably engagable to said cable;
a cable pulling device mounting frame being releasably engagable to said cable pulling device; and wherein said cable pulling device is a post tensioning ram (PTR).
2. A device as described in claim 1 wherein said cable pulling device includes at least one pair of cable engaging collets that function to engage said cable on a said pulling stroke and to release said cable on a said recovery stroke; and wherein-at least one further pair of collets is provided that function to engage said cable on said recovery stroke and release said cable on said pulling stroke.
6. A device as described in claim 2 wherein said further pair of collets is engaged within said cable pulling device.
7. A device as described in claim 6 wherein said cable pulling device is formed with a slotted cable insertion means for the sideways insertion of said cable within said cable pulling device.
14. A device for the trenchless replacement of in-situ pipe, comprising:
a mole;
a length of cable, said cable being engagable to said mole;
a cable pulling device;
a cable pulling device mounting frame being releasably engagable to said cable pulling device wherein said cable pulling device mounting frame includes an annulus member including a cable passage bore formed therethrough and a cable insertion slot formed through portions of said annulus member for the sideways insertion of said cable within said cable passage bore of said annulus member.
15. A device as described in claim 14 wherein said annulus member includes a cable pulling device holding means for releasably holding a portion of said cable pulling device therewithin.
16. A device as described in claim 14 wherein said cable pulling device mounting frame includes a reaction plate having an enlarged surface for disbursing a reaction force against a cable pulling force generated by said cable pulling device.
17. A device as described in claim 16 wherein said annulus member is mountable in relation to said reaction plate such that said reaction plate disburses cable pulling forces exerted on said annulus by said cable pulling device.
26. A device for the trenchless replacement of in-situ pipe, comprising:
a mole;
a length of cable, said cable being engagable to said mole;
a cable pulling device including a cable engagement mechanism and a cable pulling device engagement means functioning to provide a mounting structure for said cable pulling device;
said cable pulling device engagement means further including a reaction plate having an enlarged surface for disbursing a reaction force against a cable pulling force generated by said cable pulling device, and
a cable pulling frame, said cable pulling frame being mountable to said reaction plate and said cable pulling device being mountable to said cable pulling frame.
30. A mole for use in the trenchless replacement of in-situ pipe, comprising, a nose portion being engagable to a cable, a tapered body portion and a replacement pipe engagement portion, said mole further including at least one blade, said tapered body portion acting to expand said in-situ pipe for the replacement thereof with a length of replacement pipe, and said blade acting to cut pipe engagement devices encountered by said mole after said pipe has been expanded by said tapered body portion.
33. A mole as described in claim 31 wherein a threaded bore is formed within said mole, and wherein a mole engagement fixture is fixedly engaged to an end of said cable, said fixture including a threaded end portion that is threadably engagable with said threaded bore.
34. A mole as described in claim 34 wherein said fixture further includes a hex nut portion integrally formed therewith and provided for the tightening of said threaded portion within said threaded bore.
36. A cable pulling device engagement frame comprising:
an annulus member including a cable passage bore formed therethrough and a cable insertion slot formed through portions of said annulus member for the sideways insertion of a cable within said cable passage bore of said annulus member;
a reaction plate having an enlarged surface for disbursing a reaction force against a cable pulling force generated through said annulus member.
37. A frame as described in claim 36 wherein said frame includes two cable pulling device engagement devices, such that two cable pulling devices can operationally function with said frame to pull two cables simultaneously.
38. A device as described in claim 37 wherein two annulus members function as said engagement devices to engage said two cable pulling devices.
39. A device as described in claim 38 wherein the two annulus members are angularly disposed relative to each other, such that two cable pulling devices are operationally engaged therewith.
40. A method for the trenchless replacement of in-situ pipe, comprising the steps of:
exposing a first end of said pipe;
exposing a second end of said pipe;
disposing a pulling cable through said pipe between said first end and said second end;
engaging a mole to said cable at said first end;
engaging a cable pulling device to said cable at said second end; and
installing a reaction plate at said second end after said cable is disposed through said pipe, and
pulling said mole through said pipe utilizing said cable pulling device.
41. A method as described in claim 40 wherein said second end is exposed within an excavated hole, and wherein a reaction plate is disposed against a sidewall of said hole.
42. A method as described in claim 41, further including the installation of a cable pulling device engagement frame between said reaction plate and said cable pulling device after said cable is disposed through said pipe.
43. A method as described in claim 42 wherein said frame includes a pulley for changing the direction of said cable.
44. A method as described in claim 43 wherein said cable pulling device is disposed within said hole.
45. A method as described in claim 43 wherein said frame and said cable pulling device are disposed within said hole.
46. A method as described in claim 40, including the further steps of:
engaging said cable with a first pair of collets on a cable pulling stroke of said cable pulling device, and
engaging said cable with a second pair of collets on a recovery stroke of said cable pulling device.
47. A method as described in claim 40 wherein said cable pulling device is a post tensioning ram (PTR).