1. A drilling head including a generator of axial oscillations, comprising:
a motor with an axis of rotation;
a mount for coupling said drilling head to the motor, the motor driving rotation of the mount about an axis, the mount having a longitudinal axis that coincides with the axis of rotation of the motor;
a tool holder;
suspension means interposed between the mount and the tool holder and suspending said tool holder from the mount,
said suspension means comprising a controlled generator of reciprocating movements in the direction of the longitudinal axis, wherein said controlled generator of reciprocating axial movements is tubular and of the piezoelectric type without preload, pressing against the tool holder via a first end;
said mount comprising a bearing inside the controlled generator to guide a shank of the tool holder along the longitudinal axis;
said suspension means further comprising
i) an external sleeve fixed by a first end to the tool holder and by a second end to the mount, said external sleeve being axially elastic to allow axial oscillation of the tool holder induced by the controlled generator, said external sleeve being of a torsional stiffness high enough to transmit the torsion moment resulting from cutting forces; and
ii) an annular shim interposed between the controlled generator of reciprocating movements and the tool holder, said annular shim being of an axial stiffness to transmit axial oscillations, said annular shim being of a flexural stiffness low enough to reduce bending stresses transmitted to said controlled generator of reciprocating movements.
2. The drilling head as claimed in claim 1, wherein the external sleeve and the annular shim constitute means for applying an axial preload to the controlled generator of reciprocating movements.
3. The drilling head as claimed in claim 1, further comprising a guideway between the mount and the tool holder, inside the generator of reciprocating movements, allowing the transmission of torsion moments between the tool holder and the mount.
4. The drilling head as claimed in claim 1, further comprising at least one washer fixed between the mount and the tool holder, the at least one washer elastically deformable in the direction of the longitudinal axis and transmitting radial load.
5. The drilling head as claimed in claim 1, further comprising two washers fixed between the mount and the tool holder, the two washers elastically deformable in the direction of the longitudinal axis and transmitting radial load mounted in parallel.
6. The drilling head as claimed in claim 1, wherein the controlled generator of reciprocating movements carries a sensor that senses a force applied axially by the drill bit to the workpiece during machining.
7. A drilling head, comprising:
a drive motor with an axis of rotation;
a mount with a longitudinal axis and opposite first and second ends, the second end of the mount being coupled to the drive motor so that the longitudinal axis of the mount coincides with the axis of rotation of the motor, wherein the mount is hollow and includes a central recess;
a tool holder that holds a drill bit coaxial with the longitudinal axis of rotation of the mount;
a bearing located above the upper surface of the annular element and around the longitudinal axis of the mount,
wherein the tool holder further comprises a shank extending up from the upper face of the tool holder and interior to the bearing such that the shank is guided with axial slide in the bearing;
a controlled generator of reciprocating movements contained with the recess, the controlled generator comprising a piezoelectric actuator which generates oscillations directed along the longitudinal axis of the mount; and
suspension elements interposed between the mount and the tool holder, the suspension elements suspending said tool holder from the mount and comprising
i) a longitudinal coupling member that connects a lower vibrating end of the controlled generator to the tool holder, wherein longitudinal coupling member is sufficiently axially elastic to allow axial oscillation of the tool holder induced by the controlled generator, and wherein said longitudinal coupling member has a torsional stiffness high enough to transmit torsion moment resulting from cutting forces; and
ii) an annular element interposed between the controlled generator and the tool holder, said annular element being of an axial stiffness to transmit axial oscillations, said annular element having a flexural stiffness low enough to reduce bending stresses transmitted to said controlled generator.
8. The drilling head as claimed in claim 7,
wherein the longitudinal coupling member is an external sleeve fixed by a first end to the tool holder and by a second end to the mount, wherein said external sleeve is sufficiently axially elastic to allow the axial oscillation of the tool holder induced by the controlled generator, and wherein said external sleeve has the torsional stiffness high enough to transmit torsion moment resulting from cutting forces, and
the annular element is an annular shim interposed between the controlled generator and the tool holder, said annular shim being having the axial stiffness to transmit the axial oscillations, and having the flexural stiffness low enough to reduce bending stresses transmitted to said controlled generator.
9. The drilling head as claimed in claim 8, wherein the external sleeve and the annular shim apply an axial preload to the controlled generator.
10. The drilling head as claimed in claim 7, further comprising a washer fixed between the mount and the tool holder, the washer being elastically deformable in the direction of the longitudinal axis and transmitting radial load.
11. The drilling head as claimed in claim 7, further comprising two washers fixed between the mount and the tool holder, the two washers elastically deformable in the direction of the longitudinal axis and transmitting radial load mounted in parallel.
12. The drilling head as claimed in claim 7, further comprising a sensor carried by the controlled generator, the sensor positioned to sense a force applied axially by the drill bit to a workpiece during machining.
13. The drilling head as claimed in claim 7, wherein the annular element is a washer that fixes the first end of the mount to the tool holder, the washer having an upper face and a lower face, wherein i) a periphery of the upper face of the washer is mounted to a lower face of the first end of the mount, and ii) a central part of the lower face of the washer is mounted to an upper face of the tool holder, and wherein the washer transmits a torque between the mount and the tool holder and is elastically deformable in a direction of the longitudinal axis of the mount, the bearing being located above the upper surface of the washer and around the longitudinal axis of the mount.
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 moving image recording method for a moving image file of a three dimensional moving image, comprising steps of:
determining parallax information of parallax of one principal object commonly present in images of an image set captured simultaneously from multiple view points;
compressing said images in still image compression coding for separately coding said images in said image set, to obtain compressed image data; and
recording in a storage medium said moving image file constituted by plural blocks each one of which includes said compressed image data of said image set and said parallax information being determined.
2. A moving image recording method as defined in claim 1, further comprising a step of, before said determining step, capturing said images of said image set periodically.
3. A moving image recording method as defined in claim 2, wherein said images in said image set are right and left eye images.
4. A moving image recording method as defined in claim 3, wherein said determining step includes:
detecting said object in said right and left eye images;
detecting a feature point of said detected object from a particular one of said right and left eye images;
retrieving a relevant point corresponding to said feature point from a remaining image in said right and left eye images; and
determining a difference between pixel positions of said feature point and said relevant point, to obtain said parallax information.
5. A moving image recording method as defined in claim 4, wherein said object is a face region of a person.
6. A moving image recording method as defined in claim 5, wherein said feature point and said relevant point are a pupil portion or iris portion in said face region of said person.
7. A moving image recording method as defined in claim 2, wherein said still image compression coding is JPEG coding.
8. A moving image recording method as defined in claim 1, further comprising steps of:
expanding said moving image file read from said storage medium;
correcting said expanded image file according to said parallax information for each one of said blocks to minimize said parallax information in said image set; and
compressing said corrected image file according to moving image compression coding for sequential compression according to information of correlation between said images.
9. A moving image recording method as defined in claim 8, wherein said moving image compression coding is MPEG coding.
10. A moving image recording apparatus for a moving image file of a three dimensional moving image, comprising:
a plurality of image sensors for simultaneously capturing images from multiple view points to generate said images of an image set;
a parallax detection device for determining parallax information of parallax of one principal object commonly present in said images of said image set;
a compressor for compressing said images in still image compression coding for separately coding said images in said image set, to obtain compressed image data; and
a recording control unit for recording in a storage medium said moving image file constituted by plural blocks each one of which includes said compressed image data of said image set and said parallax information being determined.
11. A moving image recording apparatus as defined in claim 10, further comprising:
an expansion device for expanding said moving image file read from said storage medium;
a correction device for correcting said expanded image file from said expansion device according to said parallax information for each one of said blocks to minimize said parallax information of said image set; and
a moving image compressor for compressing said corrected image file from said correction device according to moving image compression coding for sequential compression according to information of correlation between said images.
12. A moving image coding method for a moving image file of a three dimensional moving image, comprising steps of:
determining parallax information of parallax of one principal object commonly present in images of an image set captured simultaneously from multiple view points;
compressing said images in still image compression coding for separately coding said images in said image set, to obtain compressed image data;
recording in a storage medium said moving image file constituted by plural blocks each one of which includes said compressed image data of said image set and said parallax information being determined;
expanding said recorded moving image file;
correcting said expanded image file according to said parallax information for each one of said blocks to minimize said parallax information of said image set; and
compressing said corrected image file according to moving image compression coding for sequential compression according to information of correlation between said images.
13. A moving image coder for a moving image file of a three dimensional moving image, comprising:
a parallax detection device for determining parallax information of parallax of one principal object commonly present in images of an image set captured simultaneously from multiple view points;
a compressor for compressing said images in still image compression coding for separately coding said images in said image set, to obtain compressed image data;
a recording control unit for recording in a storage medium said moving image file constituted by plural blocks each one of which includes said compressed image data of said image set and said parallax information being determined;
an expansion device for expanding said moving image file read from said storage medium;
a correction device for correcting said expanded image file from said expansion device according to said parallax information for each one of said blocks to minimize said parallax information of said image set; and
a moving image compressor for compressing said corrected image file from said correction device according to moving image compression coding for sequential compression according to information of correlation between said images.