JPS61283045A - Optical data memory and correction apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the storage of optical data, and in particular to the storage of optical data.
ing), or a relatively strong pulsating laser beam (16serbeam).
High-density optical data recording and modification apparatus, including creating small holes in a data storage recording medium using a relatively weak continuously focused laser beam and reading the data record using a relatively weak continuously focused laser beam.

Optical devices provide potential for storage.
ial), and the data correction in density and speed have the potential to far exceed anything possible using known magnetic techniques. In magnetic data storage, density is limited by the need for relatively large spaces between orbits near the data, inter alia to maintain the required magnetic separation. The laser beam can be used to penetrate a few microns (or smaller) (s
The interorbit separation is sufficiently smaller than that required for a magnetic reference frame, to the extent that it can be collected and accurately located in the data storage record and maintained at intermediate points of operation.

Therefore, high density optical data storage requires extreme accuracy in the position of the focused laser beam, both in reading and recording the data. Small variations in distance between the data record and the laser source producing the convergent beam move the focus of the beam away from the data record, resulting in an elongated spot in the record. It leads to inaccurate results both in recording and in reading the data. Similarly, with respect to the laser beam during recording or reading, changes in the relative aspect of the moving Guter recording cause the beam to record, read, and scan in poor locations. Vibrations from mechanical components, or eccentric movements, or even dimensional changes in the data storage medium due to temperature, humidity, etc. can be detected by Guter recording and methods are provided to keep the laser beam in focus at the proper location. requesting.

Current devices that used laser optics pass data through a reading and writing laser beam to a disk.
) uses a rotating mechanism to transport the In order to maintain the necessary focus and position accuracy, the disk must be precisely made, and all moving parts must be carefully constructed to avoid external perturbations as much as possible.

These systems are expensive to produce and operate, and practical considerations require that the density of the system be compromised to some extent.

Since the real system is not perfect and undesired movements will always be experienced, if high-density memory becomes a reality,
Some type of compensation mechanism must be provided in the optical system.

Prior to the present application, holding the laser beam in focus and on target is required by the detector and servo motors to ensure correct data recording in response to relative positions of the laser and even perceived inaccuracies in these positions. It was more accomplished. While this method has worked well enough to allow commercialization of audio and video optical players, it has not produced an acceptable system for computer data storage.

In the context of optical data storage, the prior art allows for mechanical inaccuracies, slight variations in the separation between the laser source and the data recording, and other factors causing transverse axis variations, which interfere with recording, reading, and synchronization. Don't stare at the system. On the other hand, it still provides the required accuracy for high density operations without the use of expensive and complex servo systems.

The present invention achieves focal height and position accuracy in a system that allows the use of moderately accurate mechanical components and eliminates the need for a servomotor detection system altogether. .

In prior art systems, the light component that creates the data record and directs the light spot onto the data record is fixed to a laser beam source. In this way, the objective lens (the lens that focuses the beam into a spot and positions it on the record) and the laser are relatively fixed relative to each other and relatively free to float on the data record. It is the maintenance of a fixed distance between the objective lens and the recording versus the prior art using servo motors. The present invention makes a bold and dramatic departure from convention by removing the objective lens from the laser optics and fixing it in place of the data recording itself. With this arrangement, the possibility of lateral defocusing into the data path due to changes in the distance between the objective lens and the object (data record) is completely eliminated.

However, since the objective lens is no longer fixed to the laser, it is difficult to focus parallel light onto the data trajectories of the read and write beams if the distance between the components is not fixed. With concomitant possibility, a change in distance between these two components is now possible. The important problem between the laser and the recording mounted on the lens is overcome by the use of a laser mounted on a large depth of focus cylindrical lens mounted on a laser optic, thus to a large extent. On the other hand, the light in the problem remains focused\
It is.

By creating a cylindrical lens (objective lens) on the recording surface, and by positioning the laser mounted on the cylindrical lens so that it is always at the correct angle to the recording (objective) lens,
The position and focus of the laser beam in data recording will be essentially unaffected by mechanical imperfections and movement resulting from recording distortion. Prior art attempts to compensate for these mechanical imperfections and recording distortions by using servo motors.

Furthermore, in particular, the optical data storage and modification system of the present invention comprises:
Mechanical inaccuracies and specific record displacements are accommodated by directing the data storage device (record) to the laser beam.

The laser beam is unidirectional, parallel, and focused only toward a focal line perpendicular to the data trajectory being recorded or read.

Changes in the relative profile of the light beam that are relatively parallel to the data recording are therefore not necessary.

As light approaches the data storage medium, it is focused to a point on the booter record by a cylindrical lens attached to the data record itself. Data storage and modification devices are generally arranged in linear or circular arrays with similar mutually tangential cylindrical lens systems mounted on the data recording surface in parallel to each other. It will consist of more than a disc. In the case of a circular disc, the cylindrical lens system will mark concentric circles or a spiral pattern.

- In one embodiment of the invention, an optical data storage and modification device for recording or reading numerical data information in data recording, using a beam with parallel light, is arranged in the trajectory of the light beam. , a first lens device operative to focus the beam into a line (11n@)K, and a second lens device attached to the data record and a portion thereof. A $2 lens device is placed in the optical trajectory of the light beam from the first lens device and operates in conjunction with the first lens device to focus the beam to the point of data recording.

For changing the position of the focal point of the light under the lens in data recording, preferably the optical data recording system includes a device operable to change the angle at which the light beam is directed onto the second lens device. There is. This would be a tilting mechanism in the light source, more preferably a moving mirror in the optical path of the system.

The present invention also includes optical data storage records or media themselves, which include a system of lenses on a cylinder fixed in position on the data record. The lens system in data recording is generally a focal length cylindrical lens that focuses parallel light onto the data recording surface. A particular data trajectory running below a given lens and parallel to the given lens is chosen by changing the angle of approach of the parallel beams to the lens surface.

Therefore, positional inaccuracies can be eliminated in the laser recording and reading system by achieving a final focus of the beam on the data recording using a cylindrical lens that is fixed and mounted in position with respect to the optical data recording itself. It is among the objects of the present invention to eliminate any need for servo motors for dynamic correction of relative displacements of position. The relative purpose is to provide an optical data storage medium suitable for receiving light for recording or reading, the recording or reading destination being one of the convex cylindrical lenses that are parallel and directly seated with respect to one direction of the field of view. using one or more
The goal is to provide an optical data storage medium suitable for focusing that light onto a point on the data record.

These and other objects, advantages, features and characteristics will become apparent from the following description of possible preferred embodiments in conjunction with the accompanying drawings.

DESCRIPTION OF THE FIGURES FIG. 1 is a perspective view diagrammatically showing the optical data storage system of the invention, and in particular shows the data storage disk, which shows the cylindrical lens forming part of the disk. Parts have been cut away to show the system.

Figure 2 shows how reading and nine light beams are focused at points in the data trajectory of the data record making up either the disk or the structure with the linear data trajectory of Figure 1. FIG. 3 is a schematic perspective view.

FIG. 3 is a diagram related to FIG. 2, considered in elevation showing the effect of relative displacement of the data storage device of the invention in relation to the recording or reading light beam; , the light beams are parallel lights in the direction of the perspective view in FIG.

FIG. 4 shows another diagrammatic view that can be considered as an elevation view for displacing the nine focal points of the light to the side in the data recording for reading and recording in different selected data trajectories. It is a diagram. It shows that the light source is tilted and the beam is directed towards a cylindrical lens on the data recording medium.

Figures 5A to 5D show different data trajectories under a special lens in data recording, a series of diagrammatic views that can be considered as elevation views. Figure 3 illustrates the geometry and effect on correcting optical deviations in selectively focusing a reading and recording light beam across a lateral field.

Figures 5E, 5C, and 5D are enlargements of either part to show the recording surface and base in greater detail.

FIG. 6 shows a schematic perspective view showing the form taken by the main components of the system of the invention.

Figure 7a is a schematic diagram of an optical data storage card with a system of parallel linear lens surfaces attached across the data storage records, all integral to the card.

Figure 7b is a plan view of a card similar to Figures 7&, but showing an optical data storage card having a system of lens surfaces arranged in an arched manner over the data recording.

FIGS. 8 and 9 are views showing a rotating disk, shown in FIG. 7b, for receiving data storage cards of the nine general types. The arched lens and optical memory trajectory
As the disk is rotated, the information is read or recorded by the light beam.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 and the other figures, the components of the system are not shown to scale, in order to better illustrate the operation and structure of the invention.
It is shown enlarged in some figures.

1 and 2, the invention provides a source 1 of parallel light 11a.
1. Point distance f!, preferably by means of a laser such as a laser diode and an optical frame 10; and likewise have the property of a cylindrical lens converging light in the device perpendicular to the lens axis 121, while discarding ineffective light in the device parallel to the axis 12a. In this way, the beam Ila from the laser 11 will become the beam 11b after passing through the lens 12 and will converge in one direction of the figure, leaving a parallel in the direction of the figure at 90°, resulting in a line (1ine) Gives an increase in intensity to the focus.

The invention also includes an optical data storage device 13 (one type being a disk) and a system of cylindrical lenses 14 as the upper surface for the focused light. Once again, the cylindrical lenses 14 focus light perpendicular to their axis 14m and discard ineffective light parallel to that axis. At or near the bottom of the storage device 13 a data recording medium data sheet 15 having a surface of 15 m is placed. The light from lens 12 is focused into a spot by lens 14, which holds the two lenses perpendicular to each other.
The spot then has a focal length f! equal to the distance between the lens and the recording surface 15a. By choosing the lens 14 to have a surface 15, the surface 15 is defined.

For purposes of clarity, it is possible to illustrate only a few of the data lenses 14 in the figures. Actually, 0.0
Lens widths as large as 4 inches (approximately 1 m) are observed in cross-sections such as those shown in FIG. For a disk, a diameter of 5 inches must contain more than 50 lenses from the center to the circumference.

A light source 11 provides a beam 11&, which records data on a data recording surface 15 m, by making small holes or pits (10 m) in the recording surface.
It can either be a relatively strong beam, reflect the properties of the recording, or change the conduction of light, such as by burning (microns or less).

Or it could be a relatively strong beam in the way the data is being read. All these are known in the art.

As described in more detail below, each lens has a number of data trajectory positions 18 (data lines defined by data pits) below it, which are 0.0
The number could be as high as 1000 for a 4 inch lens width. Data trajectory is a straight line, arc, concentric circle,
or a spiral or other limited geometry, determined by the geometry of the lens 14. The lens 14, data track 18 and storage device 13 need not be circular, but can be positioned linearly on a data storage card (credit card size) as will be described in detail below. Dew.

Since the light source 11 and the lens 12 are aligned correctly, the axis 12a of the lens 12 is always aligned with the axis 14 of the lens 14.
aK is right angle. In this way, the lens 12#i'' light source 1
1 to a line at 15 m of the recording surface, and lens 14 focuses the line to a point at 15 m of the recording surface to create or read pits along trajectory 18.

As is commonly known in the art, a photodetector (photodetector) positioned below the device 13 is used.
) 19t 'receives light from each party transmission data pit and is used to generate electrical signals in response to them. The present invention is useful in known systems in which stored information is contained in the distance between recorded data bits. For example, there may be ten different possible spaces between successive pits on the data sheet 15 in the trajectory 18. Each represents different information, such as a different Arabic numeral type 0-9. Spaces can also describe other data, or even be used in combination to represent other data. With the improvements of the present invention, the maximum spacing between bits for a given set of spaces will be as small as one pit diameter, less than 1 micron.

The light source lens 12 is preferably a cylindrical lens, but convergent to a line focus. A cylindrical mirror is used to reflect the beam as it is converged on the data lens 14 on the disk 13. b In all cases, light source 1
1 and the source lens 12 are fixed to each other and not to the objective lens f4, but instead the objective lens is fixed to the data storage record 15.

Referring to FIG. 2, the data storage device 13 (the part shown cut away from the rest) has a data sheet 15 with a data recording surface tSa at the bottom of the device 13, a transparent or A translucent space layer and a lens sheet 14 are formed on the space layer. There is an air space between the data sheet recording surface 15 and the spacer 23. It allows data to be burned into the record during writing mode without interference from the spacer. A reflective coating is used as the bottom layer 17 of the record to allow the movement of the record to be optically detected by excluding reflected light from the bottom surface, and such detection The reflected light is emitted through an optical system that compensates for the resulting movement.

Data trajectory 18 is defined by data bits 26, the size and space of which are exaggerated for purposes of explanation. The unique optical arrangement of the present invention causes the data bits to be very closely aligned on the data record and can be read with high precision. For example, a density of 1 gigabyte in a 12-inch disk, or 80 in a standard credit card, is a real possibility. As mentioned above, in a given trajectory that is approximately one pit diameter, there will be ten different spaces between bits 26, with the maximum space between the bit edges. The bits themselves can be on the order of a single micron in diameter, as the inventive system makes such decisions in focusing and positioning the read and multiple write beams.

To give an idea of the real dimensions of the data storage and modification device according to the present invention, each data lens 14 would be approximately 1 meter wide; for example, 200 separate data trajectories were placed under each data lens. The ability to put so many orbits under a single lens comes from the fact that, unlike magnetic recording, large inter-orbit spacing is not required. For example, for a beam focused to a 1 micron spot on the record, 1 and S micron spacing between the trajectories will provide adequate separation of the data. However, even an interorbital spacing of 10 miku4 yields data densities far greater than what is magnetically possible.

As the light beam 11m approaches the lens sheet 14 directed to a unique data lens 14 as shown in FIG. 2, it converges to a line focus, not a single point focus.

The theoretical line of convergence of the beam 116 toward the focal point is located essentially the length of the data lens 14, perpendicular to the data trajectory 18 and on the surface 15a. At any given point, the beam line 20 can be said to be essentially perpendicular to the longitudinal axis 14m of the data lens; however, the data lens can be linear or curved. Thus, the term vertical axis used in and in the claims is intended to apply to either linear or curved lenses.

The data lens 14 in the lens sheet 24 receives light from the light source lens 12, the light is parallel to the direction looking down the data sheet longitudinally, and directs this light beam essentially toward the data sheet surface 15a. The individual data bits are collected at point 21 in
I am reading one of 6.

The focal length f1 of the light source cylindrical lens (or mirror) is necessarily longer than the focal length f2 of the data lens 14, therefore,
The angle of convergence of the beam may be the light source lens 12 or the lens 14.
The angle of convergence is small. Therefore, the light source device 11
(and its number cylindrical lens 12) and data sheet 1
A variation in separation distance between 5 and 5 will result in slight focal separation in the datasheet. However, where variations in light to disk distance are not compensated for, the slight focal separation caused by them will have no effect on the position of the beam in the data trajectory 18, but only on the spot size. will increase. This effect can be minimized by increasing fl to reduce the angle of convergence and beam dispersion. If this focal separation is not compensated for,
The density of data bits 26 must be reduced slightly. For many applications this is perfectly acceptable (eg audio, video, etc.).

The most critical focusing of the source beam is performed by the lens 14, which is fixed to the data sheet 15 and does not follow changes in the distance between the lens and the target. By choosing lens 14 to have a focal length equal to the distance of data sheet surface 15a, the collimated light received by lens 14 will be focused onto surface 151. The combination of a lens integrated into a data storage device with a parallel light column as a reading and writing source produces results that are sensitive to data trajectory position and focal stability conditions.

To illustrate this phenomenon, referring to FIG. 3, a beam of parallel light 22 is directed toward lens 14. lens 1
4 gathers the beams at a point 31 on the data recording surface 15a. Beam 22 may be somewhat wider or narrower (the width of data lens 14). If it were wide, the peripheral portion of the beam impinging on the nearby data lenses 141 and 141 would simply be refracted into other areas of the data sheet and rendered non-toxic; There is no detector 19. If the beam is recording data, the nearby lenses 141 and 14r
The small portion of the light beam falling on will not contain enough energy to produce data bits at these locations. If sufficient energy is available, beam 22
is preferably somewhat narrower than the data lens 14, so that all nearby lenses are not illuminated except for the most extreme deviations of the beam.

The solid lines in FIG. 3 indicate the central location of the data storage device relative to the read and write beams. If the data storage device is in the position indicated by the dotted line due to thermal expansion, vibration, slight eccentricity in the annular data storage record, imperfections in the position of the light source 11, imperfections in the position of the detector 19 with respect to the special lens 14. If displaced, surface 15m
The position of the focal point 31 in will be unaffected. Similarly, changes in the distance between data storage device 13 and the light source (FIG. 2) will have no effect on the position or focus of spot 31 through lens 14.

These results can be understood by observing what happens at the lens 140 surface. If there is no change in what is seen by the lens 14, there will be no change in the effect of the light passing through the lens.If the light beam 11 is configured (in the plane of the paper) as a parallel beam, there will be no change in the effect of the light passing through the lens. Therefore, no lateral displacement or vertical movement will be able to be detected by the surface of the lens 14. It will continue to see parallel light that will be focused below the spot 31, if the recording 13 is up or down or The spot 31 remains firmly in the same position on the surface 15a even if it moves from side to side (as long as the angle of the beam 22 does not change).
is the same as In this way it will collect its light at the same location. Therefore, the data trajectory position and focus are reliably maintained without the use of detectors or servo motors.

Referring to Figure 2, the photo sensor (ph
otossnaar) 19 is placed. It has a slightly larger aperture as required to intercept all of the light beam 11b that separates from the image 21.

It can easily be seen that such a split must be slightly larger (DW/fz). Here D is data surface 1
5 m to 7 otosensor 19, W is the maximum width of beam 11b at the point in the range of beam 11b in recording 13, and f is the focal length of surface 14 with a cylindrical lens. 7 The autosensor 19 may be any type of device that produces an electrical output that depends solely on the total intensity of light impinging on its surface, e.g., a uniform sensor across a light-sensitive surface to measure its sensitivity. Photocell with light (photo)
ocall). 7 The auto sensor 19 is equipped with a shutter, and the shutter is a light-opening battery 1 for descriptive operation.
9 will be used to shield the light of beam 11b from reaching the light sensitive surfaces of beam 11b.

The illustrated arrangement at photodetector 19 (or on the opposite side of the device 13 from the light source 11 for a non-horizontal orientation of the device 13) under the data storage device 13 is only one arrangement in which the data is read. An alternative embodiment defines, for each data pit 26, the data trajectory 18 to be either reflective or non-reflective, preferably a non-reflective pit on another reflective surface. In such systems, a photodetector is typically used to read the light reflected through a beam splitting mirror and a lens sheet 24.
Located somewhere above.

Such a reflected light detection system is generally well-known, and there is no need to explain it with a diagram. Referring to FIG. Moving the beam spot is accomplished by changing the angular position of the light beam 22 to the surface of the lens 140. This is done by rotating the mirror in the optical path (
(as shown) or by moving the light source itself. The light beam 22 passes through the objective data lens 14
Since it approaches , it is parallel to the direction of the concept in FIG. And, within limits, irrespective of the angle of approach, the angular orientation, the data sheet surface 15a will essentially refract into the focal point. If the position of the light source device 11 is tilted in the device perpendicular to the data sheet, in the longitudinal axis of the lens 14, in the vicinity of the optical center C of the objective data lens 14, the effect moves to the side beam focus 31. Will. In this manner, data trajectory 18 can be selected between extreme data trajectories 18L and 18R.

When reading data, the photodetector 19 preferably
The size is such that movement of the beam from one orbit to another under the same lens will not cast light through pits outside one field of view 2 of the detector. Although the photodetector can be moved along the beam, it is suitable and preferred (according to the invention) for the photodetector 19 to have a single position for reading all data under a single lens 14 at a considered trajectory density. .

Since high density data storage is a requirement of the invention, the effects of optical anomalies occurring in moving data from one trajectory 18 to another cannot be ignored. It is truly a cylindrical lens 14, that is, a lens with uniform curvature (in optical terms, it is called
The focal field of focal point 31, as examined, would not be a device, but is in fact a curved field. Would. In this way, the focal point 31 can be brought into precise focus at multiple centers (axial foci) of the under-lens data trajectory 18, or can be brought into precise focus at the extreme left-right data trajectory 18 (as seen in FIG. 4). Although possible, all data orbital positions on the flat surface 15 will not be in explanatory focus.

Figures 5b, 5c and 5d illustrate an alternative method for correcting this anomaly. However, first of all, let's look at Figure 5a, where the data lens 14m of uniform curvature (truth spherical lens) on the flat field data record 2γ is at the focal point 28.
a (exaggerated) curved trajectory, which traverses the data record 27a at the y-fish meal focus. In connection with the present invention, the data density contemplated cannot tolerate the errors that would be introduced by a cylindrical lens with uniform curvature on a flat data recording surface. A correction to this anomaly is therefore required.

Referring to FIG. 5C, the lens 14c is true spherical, and the data sheet surface 27c on which the data bits are printed and read is also spherical, allowing the same focal point to be reached at all orbital positions under the lens. ing.

Referring to Figure 5b, the data sheet surface 27b is again flat, but the data lens 14b is not subercal, ie, not of uniform curvature. With such an arrangement, there will not be a point focused as sharply as possible with all of the parallel light inputs in the beam, but under the non-slipular lens 14b, close approach is achieved through the flat field of the data trajectory. It can be made into a real focus. However, unless extreme densities are required, the beam may be focused for reading, writing, and recording dense storage data as appropriate within the purposes of the invention.

Referring to FIG. 5d, an alternative method of correcting the suberical anomaly utilizes lens 14dt, which is also not suberical. In this way, a non-slipular curved surface is combined into a non-slipular lens. With this arrangement, close proximity of the precise focus is seen through the field of data trajectory under lens 14d.

For a spherical lens 14c (FIG. 5c) having radius r1 and centered at C, the radius r of the curved surface of the lower focal point
! will be equal to f2-rl and centered at C.

Referring to FIG. 5E, the enlargement of the data sheet 27d (or 2'7e for that matter) explains, for example, that the recording surface tSa is very thin, on the order of several microns. This thin layer will be supported on a suitable substrate 29 and coated with reflective or protective material on the bottom surface 30 of the device, the top surface 29m of the substrate 29 being spherical 27c or non-spherical as required 27d and shown with a lens (see Figures 5c and 5d), the lens has a focal point that falls on the surface 15. Datasheet 15m would be about 5 microns thick tellurium. The use of tellurium and other materials for writing and reading bits with laser beams is well known in the art, so there is no need to discuss the details of the invention.

Before describing the system illustrated in FIG. 6, it should be noted that the special device described immediately below is only one way in which the movement of the light beam is effected in accordance with the invention, and that other systems also depart from the invention. It should be emphasized that it may be used without exception. For example, tilting the light beam may be accomplished using a movable mirror as noted in \.

Referring to Figure 6 of Kinshi, in this embodiment of the invention,
Optical data storage device 13 is in the form of a rotating disk with a system of concentric data lenses 14 formed on its upper surface (see FIG. 1). The lens 14 may be in the form of concentric circles or in a continuous helical pattern, a system of concentric helical cuts, which are not mutually continuous; the fundamental operation of the system is not substantially altered by the lens geometry. Similarly, the underlens data trajectory 18 (as seen in Figs. The data lens 14 will be in one helical section below; in the latter case the data lens 14 is circular.

In any event, the data trajectory will have a geometry imposed by the geometry of the lens 14.

The optical data storage disk 13 is driven on a vertical axis 35 (or in any other desired non-vertical orientation depending on the overall system orientation) by a disk-plate drive motor 36 mounted on a substrate 37. ing). The disk 13 is operated in the usual rotary disk manner; the shaft 3B, driven by the motor 36, rotates the disk 13.

Main aspect of the invention: data lens 14 fixed to a disk
The optical data storage device 13, which may include a data sheet arrangement, or other data sheet arrangement, provides accuracy in reading, scanning, and recording beyond that of the machine alone.

Thus, the present invention allows the use of less precise mechanical parts to achieve a given accuracy of the precision achieved by the prior art with extremely precise parts and servo motors.

The light source 11, preferably a laser light source, is connected to a frame (frame).
e) The frame is pivotally supported on a horizontal shaft or axle 42, attached to 41 extension arms 39; The shaft 42 is rotatably mounted on a pivot support stand 43, which is supported on a movable base member 40. A light source 11 is positioned to direct a beam of light 22 through one of the cylindrical data lenses 14 and a disk 13.
The photo sensor 19 is located through the data recording surface near the bottom of the photo sensor 19, which is attached to a support arm 45) directly below the disc 13 of the light beam 22. It is located. Support arm 45
is attached to the support stand 43, and when the base material 40 moves,
The detector 19 is of a length and direction moving along a line parallel to the diameter of the disk 13. Preferably, photodetector 19 is large enough to receive light from any trajectory below single lens 14. Another embodiment would fasten the detector 19 to the frame 41 for rotation, where the support 7 frame 41
is rotated about the horizontal axis 42, the photodetector 19
can be tilted along the frame and light source 11.

The tilt movement of the light source 11 has the effect of moving the focused beam from the data trajectory to another trajectory, as explained above in connection with FIG.

Adjustment of the angular orientation of the beam (and in another embodiment, the photodetector) to effect movement of the focused beam from a given sub-lens trajectory to a trajectory is coupled to a stepper motor (st@p motor) 44. It is controlled by a connected gearing (partially hidden from view).

For example, through an intermediate reduction transmission, a stepper motor 44 drives a shaft 48 with a worm gear 49, which is connected to a sector (5ect) at the arched end of the pivot frame 41.
or) Move the gear or rack 51.

The step motor 44 is a motor control device 52
It receives input from a BL-cell comparator 53. Comparator 53 receives an electrical signal from the photodetector.

Initial alignment (orientation) of a newly inserted recording disc 13 may be accomplished according to an embodiment of the invention.
The detector consists of two adjacent sections (5ection
) is tilted at the light source by the method of the photodetector 19 which is divided into b. (commonly known and referred to as a "bee cell").

When the system is aligned and a given data trajectory 18 is equally perceived by both halves of the bee cell, the optics are centered on that data line. The alignment of 596 or more small errors in the orbital space is performed by the stepping motor 44 by the method of the Beacell comparator 53.
generate a correction pulse to be sent to the
It instructs stepper motor controller 52 to pulse stepper motor 4°4. The single pulse method will be repeated until the optics are aligned with the center of one of the data trajectories 18. Once centered on the data trajectory, the system can be moved closer to the nearby data trajectory by sending the appropriate number of pulses to stepper motor 44.

The Beacell comparator 53 is a two-man power spanner with a high output when the first input is higher than the second one;
If the opposite is true, the output is low. The stepping motor control 52 is controlled by a microprocessor' (m1croprac).
(Ieor) and a pulse generator, which rotates the stepper motor 44 in such a phase that if the input to the stepper motor controller is high it rotates the stepper motor in one direction and if the input is low it rotates the stepper motor in the other direction. Send a phase pulse to.

It should be understood that other devices and methods may be used to centralize sources in the data path. For example, if the photodetector is fixed as in the embodiment of FIG. 6, the stepper motor 44 is directed to scan back and forth on the trajectory until the highest light is detected from the pit into that trajectory. This shows that the beam is focused in orbit.

The choice between trajectories is determined by computer logic.
logic) device 55, which injects a predetermined number of pulses into the stepper motor;
Signals from both Biessel societies that move the beam precisely onto a data trajectory or multiple orbits are collected and sent to a computer as data signals from recording disk 13. The data recorded in this way can be read out.

When the data has been completely read, the computer logic unit 55 determines this and sends a signal to the motor limiter 52, which instructs the stepper motor 44 to tilt the orientation of the light beam 17. and send a signal to move the photocell 19 to another data orbit.

Through a computer logic device 55, the data emanating from the photodetector 19 is transmitted to a terminal ( via output line 56).

When data located under different data lenses 14 are read (or recorded), the optical data storage disk 1
3 and the reading and writing devices must move laterally to each other along a radius.

This moves the disk 13 (disk drive motor 3
6 will be completed by moving the base 40 to which the pipit support stand 43, stepper motor, and transmission are attached.

On the other hand, the disk drive motor 36 fixed to the main base member 3T and the disk are left as they are (an embodiment will be described). Another stepper motor 57 with an output shaft 58 carrying a gear 59 used for an internal reduction transmission, a gear rack on the movable substrate 40 is operative for lens movement.

If the data lenses 14 or the data tracks 18 are arranged in a spiral rather than in concentric circles, the operation of the motors 44 and 57 will be different. For example, if both were continuous spirals, motors 44 and 55 would run simultaneously and sequentially, instead of stepping the disc 13.
This is because it is being rotated and read.

The angular accuracy required to be examined during the data trajectory 18 under the special lens 14 is best illustrated in FIG. For example, extreme left and right data trajectory 18t
and 18r, respectively, are generally determined by the distance from the center of rotation C to the data surface 15&. This full width is indicated by angle A in the figure.

The value of angle A is determined by the design parameter (design pjram
eter). In the preferred embodiment, the cylindrical lens surface 14 has a diameter of about 0.04 inch and the recording disk 13 has a thickness of about 0.125 inch. A preferred material for the disc is methyl methacrylate. These choices make angle A approximately 27°. If the total number of trajectories 18 is 200, then data trajectory 1
The angle between 8L and 18r is 27/200°1 approximately 0.135
°. This is a reasonable angle that can be accurately set by prior art mechanical methods.

In the apparatus of FIG. 6, the stepper motor 44 would be set to rotate through a preset number of rotations or portions of one revolution for each pulse received from the tri stepper motor controller 52. The coupled attenuation conductor is such that each step is a known part of the data trajectory separation, so adjustments can be made first to the center in the data trajectory. The resulting preset number of pulses (steps) will then move the beam to an adjacent or other selected trajectory.

7&, an optical data card 65, preferably the size and shape of a standard credit card, has a linear strip, as shown in FIGS. 3 or 5b to 5d, above. includes a lens sheet 6T having a system of data lenses 68 arranged in parallel, linear relationship similar to that discussed in . Data is recorded on the card 65 using a beam of light and a photodetector, with the card being moved vertically in the direction of the data lens 68 associated with the light beam and photodetector, as discussed above. It can be read from 65.

Figure 7b illustrates a data card 69 similar to card 65 of Figure 7a, except that the lens sheet 71 and individual lenses 72 on the card are arranged in an arched manner as a system of concentric arcs of circles. Similar to card 65.

Figures 8 and 9 show arch optical data no. turn T7.
describes a turntable T5 having a groove T6 for receiving a data card 69 of the type shown in FIG. 7b. The arched lens γ2 is a segment of a circle whose center, when placed in the groove T6, coincides with the center of rotation T8 of the turntable.

This provides the possibility for optically stored data to be read in the manner described above with respect to FIG. 6 while the turntable 75 is rotated. The plurality of individual data cards 69 allows the combination of various data sources at once to be read and
It opens up many interesting possibilities that may be recorded.

The embodiments shown herein are for detailed explanation of the invention, but are not intended to limit the scope of the invention. Without departing from the invention as defined in the claims, FIG. 1 depicts an optical data storage system in perspective, and in particular FIG. 2 depicts a data storage disk. FIG. 3 is a perspective view showing how the light beam is focused into a data recording trajectory. FIG. 3 is an elevational view showing the effect of relative displacement of the data storage device. FIG. Elevation views Figures 5a to 54 are elevational views. Figure 6 is a perspective view of the present invention. Figure 7 is a card. Figure 7b is a card similar to Figure 7. Figures 8 and 9. The figure is a diagram of a rotating disk.

DESCRIPTION OF SYMBOLS 10... Crosslinking, 11... Parallel light source, 11a... Parallel light, 12... Cylindrical light source lens, 14... Objective data lens, 13... Data storage device, 18...
・Data orbit, 19... Photodetector, 21... Image,
15a... Data recording surface, 15... Data sheet, 22... Parallel light, 2T... Data sheet,
31... Side beam focal point, 36... Disk drive motor, 44... Stepping motor, 5γ... Stepping motor.

Sweat K Patent Attorney Hideaki Kuwabara - snout F/G, -8 F/G, -9

Claims (1)

[Claims] 1. A data sheet for high-density storage of optically readable digital information, a light transmitting lens sheet placed over and attached to said data sheet, and a light transmitting lens sheet that passes through said lens sheet. the lens curvature and the geometry of the data sheet are Optical data storage and correction device for high speed correction and high density storage of digital information, providing correction for optical deviations. 2. The data bit position is optically comprised of a plurality of data trajectory positions on the data sheet below the lens of the lens sheet, and the data trajectory positions are trajectories of data bit positions separated by 10 microns or less. equipment. 3. The apparatus according to claim 1, wherein the apparatus comprises a plurality of data trajectories optically on the data sheet under the lens of the data lens sheet, and the data trajectories consist of data bits separated by 10 microns or less. 4. The device according to claim 3, wherein the data bit has a diameter of 5 microns or less. 5. The apparatus of claim 1 comprising a highly specular reflector placed on a surface of said data sheet remote from said lens sheet. 6. The device according to any one of claims 1 to 5, wherein the data sheet is a device. 7. The device according to claims 1 to 5, wherein the lens is not spherical. 8. Apparatus according to claims 1 to 5, wherein the data sheet is made to have a plurality of adjacent curved surfaces. 9. Claim 1, wherein the cylindrical lens is a sphere of uniform radius with a curvature r_1, and the data sheet is made with a plurality of juxtaposed and closely spaced spherical surfaces of uniform radius with a curvature r_2. 5. The device according to item 5. 10. Claim 9 consisting of said spherical lenses having optically corresponding data sheet spherical surfaces, wherein the center of the curve of each said lens coincides with its corresponding data sheet spherical surface. Apparatus described in section. 11. Claim 1 defined by the data sheet, the lens forming part of a disk, and the lens defining a concentric circle around the center of the disk.
Apparatus according to items 5 to 5. 12. Claims 1 to 5 defined by the data sheet, the lens sheet forming part of a disc, and the lens defining a helix around the center of the disc. Apparatus described in section. 13. Described by the data sheet, the lens sheet forming part of a disc, and the lens defining a plurality of closely spaced concentric spirals around the center of the disc. Claims 1 to 5
Apparatus described in section. 14. Claims 1 to 5 defined by the data sheet, the lens sheet forming part of the card, and the lens defining concentric arcs of a circle.
Apparatus described in section. 15. Claims 1 to 5 described by the data sheet, the lens sheet forming a part of the card, and the lens defining parallel straight lines
Apparatus described in section. 16. A light source device providing a parallel beam of light whose optical path includes the lenses of the lens sheet, and a light source device arranged in the optical path of the light beam and directing the beam in a line perpendicular to the lens of the lens sheet concentrating the beam at a point. 5. A device according to claims 2 to 4, comprising a light source lens device operated in a condensing manner. 17. Claim No. 16 recited by the focal point lying on said data sheet on the data orbital position
Optical data storage and modification device as described in Section 1. 18. The apparatus of claim 16, providing a device operable to change the angle at which the light beam impinges on the lenses of the lens sheet. 19. A light source device providing a parallel beam of light, and a light source device having a vertical axis, disposed in the optical path of the beam from the light source device, facing the line of the data lens sheet, and directing the beam onto the lens of the data lens sheet. 2. The apparatus of claim 1, comprising a source cylindrical lens operable to focus, the longitudinal axis of said source lens being disposed perpendicular to the longitudinal axis of said data lens in the optical path of the beam. 20. The light source device is described as a laser light source device operable to generate a laser beam of parallel light, and further operable to change the angle at which the parallel beam of light from the laser light source device impinges on the data lens. 20. An optical data storage and modification apparatus according to claim 19, comprising an apparatus. 21. A special lens sheet according to claim 19 or 20, comprising a device operable to change the position of the light source device with respect to the data sheet which can be reflected such that a special lens sheet lens is in the optical path of the light source beam. Optical data storage and correction equipment. 22. A light source device comprising a focusing device for directing a concentrated unidirectional and essentially parallel vertically oriented beam of light toward said lens sheet in the optical path of the beam oriented in a line across a cylindrical data lens. An apparatus according to claim 1. 23. The apparatus of claim 22, wherein the light source device includes a source cylindrical lens through which the beam initially passes, concentrating the beam in said one direction, and whose position with respect to the light source device is fixed. 24. The device according to claim 22 or 23, wherein the light source device is a laser light source. 25. A data sheet for high-density storage of optically readable digital information, a light transmission lens overlying and attached to the data sheet, collecting parallel light passing through the lens sheet onto the data sheet. a plurality of juxtaposed and closely spaced cylindrical lenses formed on the surface of said lens sheet; a light source device providing a parallel beam of light, the optical path of which includes the lenses of said data sheet; said light source device and said lens sheet; A combination of light sources placed in the optical path of the light source between a lens and a light source operating to focus a beam in a line perpendicular to the longitudinal axis of the lens in the optical path of the light source device. Optical data storage and modification device for density storage. 26. The apparatus of claim 25, wherein the lens arrangement is described as a cylindrical lens with a longitudinal axis arranged perpendicular to the longitudinal axis of the lens sheet in the optical path. 27. The device according to claim 25 or 26, wherein the light source device and the source lens device are fixed with respect to each other. 28. Claim 25, further defined by said data sheet, said lens forming part of a disk, and said lens defining concentric circles around the center of said disk, or Any device described in paragraph 26. 29. Claim 25, further defined by said data sheet, said lens sheet forming part of a disc, and said lens defining a spiral around said disc center; or Any device described in paragraph 26. 30. By the data sheet, the lens sheet forming a part of the disc, and the lens defining a plurality of discontinuous, adjacent spirals having the same center around the center of the disc. Apparatus according to any of claims 25 or 26 as further described. 31. Any of the claims 25 or 26 further described by the data sheet, the lens sheet forming a part of the card, and the lens defining concentric arcs of a circle. That device. 32. The scope of claim 25 or 26 is further described by the data sheet, the lens sheet forming a part of the card, and the lens defining parallel straight lines. equipment. 33. In a high-density optical data storage and correction system, a data storage card having a data sheet for high-density storage of optically readable digital information, and a light transmitting lens sheet attached to cover the data sheet; Parallel light passing through the lens sheet is focused onto the lens sheet, and the data lenses form a plurality of juxtaposed and closely spaced cylindrical data lenses on the surface of the lens sheet forming an arc of a circle. , a high-density optical data storage comprising a rotatable disk having a center of rotation, suitable for receiving and holding a data card, and with said card positioned such that the center of rotation of the disk coincides with the center of curvature of said lens. and improved equipment in the correction system. 34. A data storage card with a data sheet for high-density storage of optically readable digital information;
a light transmitting lens sheet attached over the data sheet; and a plurality of parallel cylindrical shapes formed on the surface of the lens sheet such that parallel light passing through the lens sheet is focused onto the data sheet. Optical data storage and modification device for high density data storage, comprising a card holding a lens and a carrier movable in a direction parallel to the length of the cylindrical lens suitable for receiving the data storage card. 35. A light source device providing parallel light beams to an optical path including the lens of the lens sheet, and a light source device attached to the optical path of the light source device between the light source device and the lens of the lens sheet, in the optical path of the light source device. Claims 33 or 34 comprising a source lens arrangement operative to focus the beam in a line perpendicular to the longitudinal axis of the lens.
Any of the devices listed in section. 36. Claim 35, wherein the lens device is described as a cylindrical lens with a longitudinal axis mounted perpendicular to the longitudinal axis of the lens sheet lens in the optical path.
Apparatus described in section. 37. The device according to claim 35 or 36, wherein the light source device and the source lens device are fixed to each other.