JP3329837B2 - Linear stepping motor and driving method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to holding and controlling a rotating body, and more particularly to a linear stepping motor for applying a rotating force to a peripheral portion of a rotating surface and accurately controlling the rotating force, and a method of operating the same.

[0002]

2. Description of the Related Art Relatively new display devices have been developed which produce full three-dimensional images. This device usually relies on a space defined as a solid, such as a closed dome, onto which coherent light is emitted to produce an image. Each image is composed of a number of light spots (called voxels), which are created by illuminating one or more laser beams onto a solid formed in the dome.

A defined solid can be created by rotating a helical surface (disk) in a dome, ie, when the disk rotates, a solid defined by the surface of the disk is created, which rises and falls along a spiral curve. Move. Thus, any points at different heights of the volume will eventually appear at a given physical location within the dome. Therefore, the light spot can be generated by irradiating the disk with the coherent light in synchronization with the height at which the point of the light is needed and the time. By synchronizing such a large number of rays, a three-dimensional object can be created in the dome, and the rotating disk (which creates the display solid) is basically invisible to the eye. Can be seen from any position. Such a device is the subject of US patent application 07 / 409,176.

[0004] At present, there is an item called a linear stepping motor on the market. Its design and operation are well known to those skilled in the art. One of the advantages of linear stepper motors is that they have the ability to move an electric motor or propulsion device precisely along a track or platen. Linear stepper motors can also accurately determine the position of the propulsion device relative to the platen. The linear stepping motor has a feature that it can be precisely controlled and a position can be determined.

However, there is at least one control of the linear stepping motor that can be used. These allow the propulsion unit to move only along a straight platen. Linear stepper motors cannot currently be operated on a circumferential path. Therefore, there is a need in the art for a linear stepper motor that moves the body circumferentially.

[0006]

SUMMARY OF THE INVENTION A linear stepper motor operating on a horizontal straight plane is very accurate. They can propel the object back and forth and move it under control of the propulsion device along a fixed platen. Controlled magnetic and repulsive forces between the propulsion device and the platen move the propulsion device along the platen. We mobilized the platen to rotate with respect to the object, and fixed the previously possible propulsion device. The platen is then bent to form a circumference and it is attached to an annular object, such as a rim or dome, which can move clockwise and counterclockwise along the circumference. The device is designed to always know where the designated point is on the platen by magnetic and electrical feedback.

[0007] Thus, by monitoring the attached platen while operating a turntable, propeller, screen and other objects about a central axis, it is possible to determine exactly where the objects are in space. It is one of the technical features to make a linear motor that can be recognized.

Another technical advantage of the present invention is that the rotating disk is located in a confined structure, such as a dome, and is mechanically mounted around the dome to provide linear stepping with rotation of the dome. The point is that the motor rotates under the control of the motor.

Yet another technical advantage of the present invention is to provide an apparatus that is controlled by a linear stepping motor that operates to rotate about a disk.

[0010] Other features, as well as the foregoing objects, features and technical advantages of the present invention will become apparent from the following detailed description of the accompanying drawings.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before beginning the discussion of dome and linear stepper motors, it may be appropriate to provide a brief overview using the procedure by which images are generated in a limited volume. Such a discussion will be made in connection with FIG.
2. The solid V is defined by rotating around a center point, which may be either a single helix or a double helix in one embodiment. Each time point A, B, and C
Denotes spirals that are at the same physical (spatial) location but have slightly different times. The helix is spinning at 600 rpm or more, so the human eye sees the surface as if it were transparent. This transparency allows the generation of a three-dimensional image when the surface is illuminated with a coherent light source.

Accordingly, the coherent light source and optics 10, described in detail in the co-pending application entitled “Apparatus for Rotating Objects and Method Thereof ,” output light pulses 92 ,
This is spatially and temporally arranged to form a light spot 95 at a height d1 from the reference line 40 when the light pulse illuminates the surface 12. This pulse can be time-controlled to arrive a little later, illuminating the surface 12 so as to create a light spot 95 ′ at a height d 2 away from the reference line 40. If ray 92 is further delayed, then reference line 4
A light spot 95 "of height d3 from 0 will be generated.

Using this technique, it is understood that light source 10 can provide multiple rays simultaneously to each point in a large space.
In Re, 3-dimensional image can be constructed in terms of light. Since the rotating helix is transparent to the human eye, the light spot appears floating and can be viewed from any angle and from any direction.

FIG. 1 shows an apparatus 10 having a disk 12 mounted in an inverted dome 11. The disk 12 is actually a flat disk and defines a solid by rotating as described above. The motor 13 rotates the connected disk and dome.

FIG. 2 shows the dome 11 actually in contact with the disk 12. The disk 12 shows a field of view defined by the contact between the dome 11 and the disk 12. The disk is a spiral in this embodiment.

FIG. 3 shows a top view of the disk 12. In this embodiment, the disk 12 is a double spiral.

FIG. 4 shows a disk 12 with two legs extended.
ot risedisk). The extension of the foot indicates the amount of solid in the dome 11 that can display an image. This figure is a vertical elevation view when the disk is at the highest point as the radial distance.

FIG. 5 is a diagram of a linear stepping motor 50 having a propulsion unit 51 as a driving mechanism. Platen 52
Is a trajectory for propelling the propulsion device 51. The propulsion device 51 is fixed, and the platen 52 is propelled along the circumference. Dome 11
Is attached to the platen 52. Surface 53 is a balancing mechanism or a fixed balancing weight attached to dome 11 and disk 12 to stabilize the dome and disk during rotation.

A specific example of such a linear stepping motor is a linear stepping motor that rotates a screen around an axis. Such a linear stepping motor comprises a dome in which the screen is mounted, an annular platen mounted on the screen perpendicular to the axis and intersecting the axis and the center of curvature of the platen. And a plurality of fixed propulsion units arranged at intervals around the platen and controlled by signals for rotating the dome.

FIG. 6 is a top view of the bottom of the platen 52, showing the radiation structure of the magnet element 56 embedded therein.

FIG. 7 shows a vertical view of a linear drive stepping motor 70 in which the propulsion unit 71 is fixed on the outside and the platen 72 is connected to the dome 11 on the inside. The radial distance between the thruster 71 and the platen 72 from the center of the dome 11 is the same.

FIG. 8 is a side view of the propulsion unit 71 and the platen 72, and shows a state in which the bottom of the dome 11 is driven while being mounted on a rotary table (not shown).

While this description has made the invention with reference to the specific embodiments described above, the claims rather than this description limit the scope of the invention. Various modifications of the disclosed embodiment, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to the above description. It is therefore intended that the appended claims cover such modifications as fall within the true scope of the invention.

All of the following patent applications are cross-referenced to each other, all of which are assigned to Texas Instruments. These applications are currently under examination and are also referenced in this patent application.

Agent processing number TI-15405 Rotating body holding and rotating device and method Patent application number 563,180 TI-15406 Design and operation method of linear stepping motor Patent application number 563,238 TI-15407 Stereographic display device Patent application number 563,372 TI-15408 Stereoscopic display development device Patent application number 563,374 TI-15409 Stereoscopic display optical device and method Patent application number 563,370

With respect to the above description, the following items are further disclosed.

1. A linear stepping motor, comprising: a fixed propulsion device having a curved portion and a magnetic element disposed therein; and a platen having a magnetic element disposed therein, wherein the platen includes a magnetic element. A linear stepper motor including the platen operable to drive the platen in an arc along the curved portion of the propulsion device, both elements.

2. The motor of claim 1 wherein said platen further attaches a rotatable structure to said platen such that said rotatable structure draws the same arc as said platen under control of said propulsion device. Motor including a lock mechanism for the motor.

3. The motor of claim 2 further including a position determining device mounted on said platen for issuing a signal of the rotational position of said platen on said arc.

4. An apparatus for rotating a dome, the apparatus comprising: a dome having a circumference for controlling the rotation; and a fixed member having a plurality of controllable magnetic fields therein. A fixing member having a curvature radius matching a curvature radius of a peripheral edge, and being engaged with the fixing member, responding to the magnetic field of the fixing member, and moving along the curvature radius of the fixing member under control of the magnetic field. A motor comprising: a movable member; and a connecting member for connecting the circumferential edge of the dome to the movable member.

5. The apparatus of claim 4, further comprising a plurality of said movable members spaced along said fixed member, each said movable member defining said circumferential edge of said dome. A device comprising the plurality of movable members mounted at a point identified.

6. The apparatus according to claim 5, wherein said fixed member comprises a complete circle and drives said controllable magnetic field to control the rotational speed of said dome around said circle.

7. The apparatus according to claim 6, further comprising a position determining member for issuing a signal of at least one rotational position of said movable member on said circumference.

8. A method of rotating a dome having a circumference for controlling rotation, the method comprising: fixing a fixed member having a plurality of controllable magnetic fields therein to a radius of curvature of the circumference. A method of rotating disposed on a circumference having a matching radius, moving a movable member under control of the magnetic field along the fixed member, and connecting the circumference of the dome to the movable member.

9. The method of claim 8, further comprising: disposing the plurality of movable members at intervals along the fixed member;
The method wherein each of the movable members is mounted at a finite point on the circumference of the dome.

10. The method of claim 9, further comprising issuing a signal of a rotational position of at least one of said movable members on said circumference.

11. A linear stepper motor comprising a stationary propulsion device having a radius of curvature and capable of providing a signal, and a movable stepper having a matching radius of curvature and moving in response to the provided signal. motor.

12. The apparatus according to claim 11, wherein said platen is a perfect circle.

13. The device according to item 11, further comprising a plurality of propulsion devices.

14. A linear stepper motor for rotating a screen around one axis, the dome having the screen mounted inside the dome, and the screen having a platen and a shaft perpendicular to the axis. An annular platen mounted so that it intersects the center of curvature of the platen; and a plurality of stationary propulsion devices spaced around the platen and rotating the dome under control of a supplied signal. The linear stepping motor.

15. The apparatus according to claim 14, further comprising magnetic elements horizontally aligned in a common plane within said annular platen.

16. The apparatus of claim 14, further comprising magnetic elements parallel and vertically aligned along the outer surface of said annular platen.

17. The apparatus according to claim 14, further comprising a device for determining a position of said platen with respect to said propulsion device.

18. A device and a method for controlling the rotation of a circumferential structure such as the dome 11 from the outer periphery of the dome 11 are disclosed herein. The device uses a linear stepper motor having a circumferential fixed part and a movable part 72. The movable part 72 is attached to the edge of the dome and is magnetically coupled to the fixed part. The controllable magnetic field induced between the movable and fixed parts is
2, so that the dome 11 is driven around the circumferential fixed part 71. The speed of the dome is controlled by the magnetic field and the position of the dome can be monitored by monitoring the position of the active magnetic field.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a surface that generates a solid defined within a dome.

FIG. 2 schematically shows a solid generated on a rotating surface.

FIG. 3 schematically shows a solid generated on a rotating surface.

FIG. 4 is a diagram schematically illustrating a solid generated on a rotating surface.

FIG. 5 is a diagram showing an outer edge of a dome attached to a platen of the linear stepping motor.

FIG. 6 is a diagram showing a bottom portion of a curved platen.

FIG. 7 shows a side-mounted curved linear motor.

FIG. 8 is a diagram illustrating a radius of curvature of a linear stepping motor.

FIG. 9 is a diagram showing a solid generated on a helical surface.

[Explanation of symbols]

 Reference Signs List 10 Device having linear stepping motor 11 Dome 12 Surface 13 Motor 50 Linear driving stepping motor 51, 71 Propeller 52, 72 Platen 56 Magnetic element 73 Embedded magnetic element 92 Coherent light beam

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 41/00-41/035 H02K 37/00-37/24

Claims (10)

(57) [Claims] 1. A linear stepper motor , comprising : a platen having a fixed propulsion device provided with a curved portion and a magnetic element disposed therein, and having a circular peripheral portion.
Has approximately the same curvature as the fixed propulsion device, and there
Operatively arranged in cooperation with the magnetic element of the fixed thruster
The platen along the fixed propulsion
Having a magnetic element to drive and supporting the platen only along the peripheral area
Linear stepping motor with support mechanism for 2. A rotating structure is provided on the platen.
A rotating mechanism, wherein the rotating structure is fixedly propelled.
Rotates along the same arc as the platen under machine control.
For supporting by the platen
2. The linear stepping motor according to 1 . 3. The linear stepping motor according to claim 2, wherein the rotating structure has a dome having a circumferential edge fixedly connected to the platen. 4. The apparatus according to claim 1, further comprising a screen physically coupled to said platen, said screen rotating in synchronization with said platen to project radiation onto said screen in a manner synchronized with the rotation of said screen. 2. The linear stepping motor according to 1. 5. The linear stepping motor according to claim 1, further comprising a positioning mechanism for indicating an angular position of said platen. 6. The linear stepping motor according to claim 1, wherein the platen extends in a full circle. 7. The linear stepping motor according to claim 1, further comprising a plurality of fixed propulsion units arranged at annularly spaced positions along the platen. 8. A rotating method for controlling rotation of a dome having a circumference, the method comprising: fixing a stationary member containing a plurality of controllable magnetic fields to a circle having a radius matching the radius of curvature of the circumference. Moving a movable member having a circular peripheral portion along the fixed member under the control of the magnetic field, connecting the circumferential edge of the dome to the movable member, A rotating method comprising supporting the movable member only along the axis. 9. The method of claim 8, further comprising: synchronizing and rotating a screen physically coupled to the dome, and projecting radiation onto the screen in a manner synchronized with the rotation of the screen. Rotation method. 10. The rotating method according to claim 8, further comprising a step of detecting a rotational position of the movable member and the dome.