What is claimed is:
1. In an optical wave interferometer for splitting a luminous flux from a light source into two, irradiating a sample with one of thus obtained two luminous fluxes so as to attain object light carrying a phase state of said sample, irradiating a reference plate with the other so as to attain reference light carrying a phase state of said reference plate, and re-combining said object light and reference light together so as to attain an interference fringe corresponding to a phase difference therebetween;
a support apparatus for an optical wave interferometer reference plate comprising a support member for supporting an outer peripheral face of said reference plate, said support member being a structure bonded to said outer peripheral face of said reference plate at a plurality of positions spaced from each other along a circumferential direction of said outer peripheral face and adapted to deform elastically in a circumferentialdiametric direction of said reference plate but less in an optical axis direction of said reference plate than in said circumferentialdiametric direction.
2. A support apparatus for an optical wave interferometer reference plate according to claim 1, wherein said support member has an annular form surrounding said outer peripheral face of said reference plate, said support member comprising cutouts extending from one of first and second ends in said optical axis direction of said reference plate toward the other to a position near said other end, and wherein cutouts extending from said first end toward said second end and cutouts extending from said second end toward said first end are disposed substantially alternately with respect to each other along said circumferential direction of said support member.
3. A support apparatus for an optical wave interferometer reference plate according to claim 2, wherein said support member is formed with adhesive injection holes penetrating through said support member from said outer peripheral face to said inner peripheral face with a predetermined interval along said circumferential direction of said support member, and wherein a groove extending in said circumferential direction is formed at respective positions where said adhesive injection holes are formed.
4. A support apparatus for an optical wave interferometer reference plate according to claim 1, wherein said support member has an annular base disposed at a position separated from said outer peripheral face of said reference plate in said optical axis direction of said reference plate, a plurality of support arms extending from said base in said optical axis direction of said reference plate in a cantilever fashion at a plurality of positions spaced from each other by a predetermined interval along said circumferential direction of said base, and a bonding part formed in each of said support arms so as to be bonded to said outer peripheral face.
5. A support apparatus for an optical wave interferometer reference plate according to claim 4, wherein said bonding part is constituted by an adhesive injection hole penetrating through said support arms from an outer side face to an inner side face thereof, and wherein a groove extending in said circumferential direction of said base is formed at a position where said adhesive injection hole is formed in said inner side face.
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 method for readingwriting data of a disk drive that includes a spindle motor for rotating an optical disk and a head for readingwriting data from and to the disk, comprising the steps:
adjusting a position of the head for the first time in order to space apart the head from a center of the disk at a specific distance, wherein when the head is spaced apart from the center of the disk at said specific distance, an average vibration magnitude of the disk is the minimum during raising the rotating speed of the spindle motor from a low speed to a high speed;
raising said spindle motor from said low speed to said high speed; and
adjusting a position of the head for the second time in order to move the head to a desired track in the disk, thereby starting data readingwriting operation from and to the desired track in the disk.
2. The method according to claim 1, further comprising the following steps prior to adjusting the position of the head for the first time:
analyzing relationship among rotation speed of the spindle motor, a distance of the head with respect to the center of the disk and vibration magnitude of the disk, thereby obtaining an analyzed result; and
determining said specific distance of the head with respect to the center of the disk based on said analyzed result, wherein when the head is spaced apart from the center of the disk at said specific distance, the average vibration magnitude of the disk is the minimum during raising the rotating speed of the spindle motor from said low speed to said high speed.
3. The method according to claim 2, wherein said low speed of the spindle motor is 50 to 70 rps (rotations per second).
4. The method according to claim 2, wherein said high speed of the spindle motor is 180 to 240 rps (rotations per second).
5. The method according to claim 1, wherein said specific distance of the head with respect to the center of the disk ranges 22 to 58 mm.
6. The method according to claim 1, wherein said average vibration magnitude is an average of the vibration magnitude of said spindle motor at different speeds during raising the rotating speed of the spindle motor from said low speed to said high speed.
7. The method according to claim 1, wherein the step of adjusting said position of the head for the second time is to move the head horizontally relative to the disk to enable a laser beam emitted from the head focusing on the desired track in the disk, thereby starting data readingwriting operation from and to the desired track in the disk.
8. A method for readingwriting data of a disk drive that includes a spindle motor for rotating an optical disk and a head for readingwriting data from and to the disk, comprising the steps of:
moving the head to have a specific distance from a center of the disk before raising said spindle motor;
raising said spindle motor from a low speed to a high speed; and
moving the head to a desired track in the disk, thereby starting data readingwriting operation;
wherein the disk has a minimum average vibration magnitude during the raising step of said spindle motor when the head locates with said specific distance from the center of the disk.
9. The method according to claim 8, wherein said specific distance is determined by a vibration analyzed result of the disk.
10. The method according to claim 8, further comprising the steps of:
analyzing relationship among rotation speed of the spindle motor, a distance of the head with respect to the center of the disk and vibration magnitude of the disk, thereby obtaining an analyzed result; and
determining said specific distance of the head with respect to the center of the disk based on said analyzed result.
11. The method according to claim 8, wherein said low speed of the spindle motor is 50 to 70 rps (rotations per second).
12. The method according to claim 8, wherein said high speed of the spindle motor is 180 to 240 rps (rotations per second).
13. The method according to claim 8, wherein said specific distance of the head with respect to the center of the disk ranges 22 to 58 mm.
14. The method according to claim 8, wherein said average vibration magnitude is an average of the vibration magnitude of said spindle motor during raising the rotating speed of the spindle motor from said low speed to said high speed.