CA1270059A - Method of detecting the position of an optical head - Google Patents
Method of detecting the position of an optical headInfo
- Publication number
- CA1270059A CA1270059A CA000505632A CA505632A CA1270059A CA 1270059 A CA1270059 A CA 1270059A CA 000505632 A CA000505632 A CA 000505632A CA 505632 A CA505632 A CA 505632A CA 1270059 A CA1270059 A CA 1270059A
- Authority
- CA
- Canada
- Prior art keywords
- optical
- track
- optical card
- card
- optical head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
- G11B17/34—Guiding record carriers during transducing operation, e.g. for track following
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/01—Details
- G06K7/015—Aligning or centering of the sensing device with respect to the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/14—Control of operating function, e.g. switching from recording to reproducing by sensing movement or position of head, e.g. means moving in correspondence with head movements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
Abstract
ABSTRACT OF THE DISCLOSURE
In the method according to the present invenion, before data are recorded on an optical card or the data recorded on the card are reproduced, an optical head for applying a light beam to the optical card and the optical card are displaced relative to each other in the direction of track of the optical card and a track number written on the optical card is read to thereby detect the position of the optical head relative to the optical card.
In the method according to the present invenion, before data are recorded on an optical card or the data recorded on the card are reproduced, an optical head for applying a light beam to the optical card and the optical card are displaced relative to each other in the direction of track of the optical card and a track number written on the optical card is read to thereby detect the position of the optical head relative to the optical card.
Description
1~7(305~
Method of Detecting the Position of an Optical Head BACKGROUN~ OF THE INVENTION
Field of the Invention This invention relates to a method of deteoting the position of an optical head in a recording-reproduc-ing apparatus for recording or reproducing data on a card-like recording medium (hereinafter referred to as the optical card) by the use of a light beam, that is, detecting the relative positional relation of the optical head to the optical card before recording or reproduction of data is effected. The recording-reproducing apparatus referred to herein means anapparatus for effecting only one or both of recording and reproduction.
Related Background A~t In recent years, along with the advance of the informational age, attention has been paid to optical cards as information storing means. The main features of the optical cards are that as compared with optical discs and optical tapes, they are of a card-like shape which is easy to carry and handle and that as compared with magnetic cards and IC cards, they have a great storage capacity.
Now, in recording reproducing data through a lX70059 1 storing medium such as an optical card, the relative positional relation between the optical card and the optical head in the initial state need be apparent before the recording or reproducing operation is started.
For example, generally, most recording-reproducing apparatus are in such a form that before said operation is started, the information of the area of contents which is provided in the optical card and in which the data situation or the like in the optical card is written is read and the operation is performed on the basis of that information. Accordingly, to shorten the time required for the recording or reproduction of data, it is necessary that after the optical card has been inserted into the apparatus or when the recording or reproducing operation once interrupted is to be resumed, the relative position of the optical head and the optical card be quickly moved to bring about a state in which the information of said area of contents can be reproduced.
Herein, the position in which the optical head is positioned in such a state relative to the optical card is called the home position of the optical head.
SUMMARY OF THE INVENTION
.
It is the object of the present invention to provide a method of ~uickly detecting the position of an optical head to enable the optical head to quickly stand by at a predetermined position.
In the method according to the present invention, ,~
'' , ': ' ',, ~ "'; ' ~ '" :
, , .. ... . . .
. . . , -,,- ~ ~ , 1.270~353 an optical head, for recording or reproducing information on or from an optical card having a plurality of linearly extending tracks and position information written correspondingly to each end area of each track, is positioned to a target position relative to the optical card by the steps of:
instructing the optical head to move relative to the optical card and to record or reproduce information;
reciprocatively and linearly displacing the optical head relative to a track of the optical card on the basis of an instruction produced by said instructing step;
reading the position information written on the end area of the track on the optical card; and positioning the optical head to a target position relative to the optical card on the basis of the position information so read.
The invention will hereinafter be described in more detail with reference to the accompanying drawings, in which:
Figure 1 shows an embodiment of the optical card.
Figures 2 and 3 illustrate the accessing method according to the present invention.
Figure 4 shows an embodiment of the optical card recording-reproducing apparatus using the accessing method according to the present invention.
Figure 1 is a schematic view showing an embodiment of the optical card. Reference numeral 1 designates the optical card, reference numeral 2 denotes an area in which data are recorded, and reference characters 3a, 3b and 3c represent track units. The track unit herein referred to means a combination of minimum necessary types of track including, in addition to a data track on which data are written, a tracking track for effecting reliable writing and reading of data to and from the data track, and a clock track.
Figure 2 is a view illustrating the method according to the present invention by reference to an optical card one which exemplary track units are shown. These track units, as B
..
~270059 shown in Figure 2, consists of tracking tracks lla, llb, llc and data tracks 12a, 12b. At the opposite ends of the data tracks 12a and 12b, there are data track identification areas 13a and 13b in which data track numbers for identifying the data tracks are recorded.
Before writing or reading of data is effected, a beam spot 14a for scanning the track for data and a beam spot 15a for scanning the track for tracking may lie at any positions on the optical card. On initiation of a reading or writing operation, an optical head of a recording-reproducing apparatus, not shown, is moved in the left and right direction as viewed in Figure 2 (the direction of movement of the track) and auto-focusing and auto-tracking functions of the recording-reproducing apparatus are caused to act by reflected light from the beam spot 15a, whereby the light spot 14a for data and the light spot 15a for tracking are positioned on the nearest data track 12a and tracking track lla respectively. The light spots in this state are designated by reference characters 14b and 15b, respectively.
As the light spots move to the end of the track, the spot 14b passes the data track identification area and as a result the data track number 13a is read. This informs the apparatus of the relative positional relation between the optical head and the optical card at the current point of time. Accordingly, after the above-described operation, the optical head can be moved to a desired track unit to accomplish a required writing or reading of data. For example, when data track number is read and the relative positional relation between the optical head and the optical card is recoqnized, the mutual positional relation of the card and the head is modified so that the optical head moves to a directory area, and from this home position, a further command can be issued.
Means for giving a command to start the relative movement in the track direction to ascertain the positional relation between the optical card and the optical head may be B
, . . . . .. .
........ . .
. ,. ~,~ ."
,. ` ,. .
. .-~ . . , - . .. .. . ..
- ,;
.: -: ..,., ~
.
lZ~0059 for example, a signal from a sensor for confirming that the optical card has entered a predetermined position, or a manual signal given by the operator. As shown in Figure 2, data track identification areas are provided at the opposite ends of each data track, so that it is conveniently possible to read the data track number by the movement of the optical head relative to the optical card either from right to left or from left to right.
As can be seen from the foregoing description, the present invention enables access of the optical head to be accomplished by a simple system. Further, the present invention can cope with different types of optical cards in which the shapes of the track units are the same but which differ from one another in the position and size of the data area 2 shown in Figure 1.
Figure 3 is a view further illustrating the method of the present invention with reference to an optical card having track units as shown in Figure 2. In Figure 3, elements functionally similar to those in Figure 2 are given similar reference characters. The difference from the embodiment shown in Figure 2 is that there are a plurality of light spots 14a for data. Again in Figure 3, in the initial state, the two light spots 14a for data and the light spot 15a for tracking may be at any positions on the optical card, but by a similar operation to that previously described, the light spots 14a for reading data can be positioned on the nearest data tracks 12a and 12b, respectively, and the light spot 15a for tracking can be positioned on the track llb for tracking. As a result, both of the data track numbers 13a and 13b can be read at the same time. Accordingly, not only can the position of the optical head be ascertained by reading the data track numbers 13a and 13b, but it becomes possible to know also the direction in which the next track unit to be accessed is to be found. This provides a practically very useful advantage in that the optical card shown in Figure 1 may be inserted into the optical recording-~ - .
30',~
reproducing apparatus with either the A side or the B side leading.
Although the foregoing description has been made with respect to apparatus of the type in which the optical head is moved, the optical card may of course be moved relative to the head in the direction of movement of the track. As regards the specific means for realizing the auto-focusing and the auto-tracking functions, the critical angle method, the knife edge method, the astigmatism method, are examples of known techniques for the former and the 3-beam method, the push-pull method, the heterodyne method are examples of known techniques for the latter, and any of these methods may be used. Furthermore, although the foregoing description has been made use of data track numbers, it is also possible to set a tracking track number corresponding to the track for tracking and utilize that number to detect the position of the optical head.
Figure 4 is a schematic diagram showing an embodiment of optical card recording-reproducing apparatus using the detecting method according to the present invention.
In Figure 4, reference numeral 21 designates a sensor for mechanically or electrically detecting the insertion of the optical card 1 into the apparatus, reference numeral 22 denotes a DC motor driver, reference numeral 23 designates a DC motor for reciprocating a table (not shown) supporting the optical card 1 thereon in the track directions of the card (the directions shown by the bilateral arrow), and reference numeral 24 denotes an optical head for simultaneously applying three light beams to the optical card as shown in Figure 3. The construction of this optical head is similar to that of the optical head used with a conventional optical disc except that a diffraction grating for separating the light beam from a light source into three light beams is provided, and its detailed construction is not described herein. Reference numeral 25 designates a circuit for recovering information recorded on the tracks from a signal ., ' read by the optical head, as described in connection with Figures 2 and 3, reference numeral 26 denotes a comparator, reference numeral 27 designates a pulse operating circuit, reference numeral 28 denotes a setting circuit for determining a position to which the optical head is to be subsequently moved relative to the optical card, reference numeral 29 designates a stepper pulse, motor driver, and reference numeral 30 denotes a stepper pulse motor for moving the optical head 24 relative to the optical card 1.
When it detects the insertion of the optical card 1, the sensor 21 outputs a detection signal to the DC motor driver 22 and on the basis of this signal, the DC motor driver 22 drives the DC motor 23 to move the optical card 1 in the direction of movement of the track. Simultaneously, on the basis of a further detection signal from the sensor 21, the optical head 24 reads the information on two tracks of the optical card 1 while performing the auto-focusing and the auto-tracking function. From this information, the reproducing circuit 25 identifies the track number of each track and this information is supplied to the comparator 26.
When it receives the result of comparison from the comparator 26, the pulse operating circuit 27 supplies the pulse motor driver 29 with a signal of the next track to be accessed by the optical head, with the value set by the setting circuit 28 as a reference, and the puls~ motor driver 29 drives the pulse motor 30 the optical head 24 to access a predetermined track.
With the above-described apparatus, it is possible to carry out the method according to the present invention. In Figure 4, an arrangement in which the insertion of the optical card into the apparatus is detected to start a series of operations has been shown, whereas this need not always be the case. Thus the present method is of course applicable also to a case in which the optical card is already inserted in the apparatus, recording or reproduction of data has been carried out, and operation has been interrupted, whereafter ~70(~59 further recording or reproduction is again required.
~'
Method of Detecting the Position of an Optical Head BACKGROUN~ OF THE INVENTION
Field of the Invention This invention relates to a method of deteoting the position of an optical head in a recording-reproduc-ing apparatus for recording or reproducing data on a card-like recording medium (hereinafter referred to as the optical card) by the use of a light beam, that is, detecting the relative positional relation of the optical head to the optical card before recording or reproduction of data is effected. The recording-reproducing apparatus referred to herein means anapparatus for effecting only one or both of recording and reproduction.
Related Background A~t In recent years, along with the advance of the informational age, attention has been paid to optical cards as information storing means. The main features of the optical cards are that as compared with optical discs and optical tapes, they are of a card-like shape which is easy to carry and handle and that as compared with magnetic cards and IC cards, they have a great storage capacity.
Now, in recording reproducing data through a lX70059 1 storing medium such as an optical card, the relative positional relation between the optical card and the optical head in the initial state need be apparent before the recording or reproducing operation is started.
For example, generally, most recording-reproducing apparatus are in such a form that before said operation is started, the information of the area of contents which is provided in the optical card and in which the data situation or the like in the optical card is written is read and the operation is performed on the basis of that information. Accordingly, to shorten the time required for the recording or reproduction of data, it is necessary that after the optical card has been inserted into the apparatus or when the recording or reproducing operation once interrupted is to be resumed, the relative position of the optical head and the optical card be quickly moved to bring about a state in which the information of said area of contents can be reproduced.
Herein, the position in which the optical head is positioned in such a state relative to the optical card is called the home position of the optical head.
SUMMARY OF THE INVENTION
.
It is the object of the present invention to provide a method of ~uickly detecting the position of an optical head to enable the optical head to quickly stand by at a predetermined position.
In the method according to the present invention, ,~
'' , ': ' ',, ~ "'; ' ~ '" :
, , .. ... . . .
. . . , -,,- ~ ~ , 1.270~353 an optical head, for recording or reproducing information on or from an optical card having a plurality of linearly extending tracks and position information written correspondingly to each end area of each track, is positioned to a target position relative to the optical card by the steps of:
instructing the optical head to move relative to the optical card and to record or reproduce information;
reciprocatively and linearly displacing the optical head relative to a track of the optical card on the basis of an instruction produced by said instructing step;
reading the position information written on the end area of the track on the optical card; and positioning the optical head to a target position relative to the optical card on the basis of the position information so read.
The invention will hereinafter be described in more detail with reference to the accompanying drawings, in which:
Figure 1 shows an embodiment of the optical card.
Figures 2 and 3 illustrate the accessing method according to the present invention.
Figure 4 shows an embodiment of the optical card recording-reproducing apparatus using the accessing method according to the present invention.
Figure 1 is a schematic view showing an embodiment of the optical card. Reference numeral 1 designates the optical card, reference numeral 2 denotes an area in which data are recorded, and reference characters 3a, 3b and 3c represent track units. The track unit herein referred to means a combination of minimum necessary types of track including, in addition to a data track on which data are written, a tracking track for effecting reliable writing and reading of data to and from the data track, and a clock track.
Figure 2 is a view illustrating the method according to the present invention by reference to an optical card one which exemplary track units are shown. These track units, as B
..
~270059 shown in Figure 2, consists of tracking tracks lla, llb, llc and data tracks 12a, 12b. At the opposite ends of the data tracks 12a and 12b, there are data track identification areas 13a and 13b in which data track numbers for identifying the data tracks are recorded.
Before writing or reading of data is effected, a beam spot 14a for scanning the track for data and a beam spot 15a for scanning the track for tracking may lie at any positions on the optical card. On initiation of a reading or writing operation, an optical head of a recording-reproducing apparatus, not shown, is moved in the left and right direction as viewed in Figure 2 (the direction of movement of the track) and auto-focusing and auto-tracking functions of the recording-reproducing apparatus are caused to act by reflected light from the beam spot 15a, whereby the light spot 14a for data and the light spot 15a for tracking are positioned on the nearest data track 12a and tracking track lla respectively. The light spots in this state are designated by reference characters 14b and 15b, respectively.
As the light spots move to the end of the track, the spot 14b passes the data track identification area and as a result the data track number 13a is read. This informs the apparatus of the relative positional relation between the optical head and the optical card at the current point of time. Accordingly, after the above-described operation, the optical head can be moved to a desired track unit to accomplish a required writing or reading of data. For example, when data track number is read and the relative positional relation between the optical head and the optical card is recoqnized, the mutual positional relation of the card and the head is modified so that the optical head moves to a directory area, and from this home position, a further command can be issued.
Means for giving a command to start the relative movement in the track direction to ascertain the positional relation between the optical card and the optical head may be B
, . . . . .. .
........ . .
. ,. ~,~ ."
,. ` ,. .
. .-~ . . , - . .. .. . ..
- ,;
.: -: ..,., ~
.
lZ~0059 for example, a signal from a sensor for confirming that the optical card has entered a predetermined position, or a manual signal given by the operator. As shown in Figure 2, data track identification areas are provided at the opposite ends of each data track, so that it is conveniently possible to read the data track number by the movement of the optical head relative to the optical card either from right to left or from left to right.
As can be seen from the foregoing description, the present invention enables access of the optical head to be accomplished by a simple system. Further, the present invention can cope with different types of optical cards in which the shapes of the track units are the same but which differ from one another in the position and size of the data area 2 shown in Figure 1.
Figure 3 is a view further illustrating the method of the present invention with reference to an optical card having track units as shown in Figure 2. In Figure 3, elements functionally similar to those in Figure 2 are given similar reference characters. The difference from the embodiment shown in Figure 2 is that there are a plurality of light spots 14a for data. Again in Figure 3, in the initial state, the two light spots 14a for data and the light spot 15a for tracking may be at any positions on the optical card, but by a similar operation to that previously described, the light spots 14a for reading data can be positioned on the nearest data tracks 12a and 12b, respectively, and the light spot 15a for tracking can be positioned on the track llb for tracking. As a result, both of the data track numbers 13a and 13b can be read at the same time. Accordingly, not only can the position of the optical head be ascertained by reading the data track numbers 13a and 13b, but it becomes possible to know also the direction in which the next track unit to be accessed is to be found. This provides a practically very useful advantage in that the optical card shown in Figure 1 may be inserted into the optical recording-~ - .
30',~
reproducing apparatus with either the A side or the B side leading.
Although the foregoing description has been made with respect to apparatus of the type in which the optical head is moved, the optical card may of course be moved relative to the head in the direction of movement of the track. As regards the specific means for realizing the auto-focusing and the auto-tracking functions, the critical angle method, the knife edge method, the astigmatism method, are examples of known techniques for the former and the 3-beam method, the push-pull method, the heterodyne method are examples of known techniques for the latter, and any of these methods may be used. Furthermore, although the foregoing description has been made use of data track numbers, it is also possible to set a tracking track number corresponding to the track for tracking and utilize that number to detect the position of the optical head.
Figure 4 is a schematic diagram showing an embodiment of optical card recording-reproducing apparatus using the detecting method according to the present invention.
In Figure 4, reference numeral 21 designates a sensor for mechanically or electrically detecting the insertion of the optical card 1 into the apparatus, reference numeral 22 denotes a DC motor driver, reference numeral 23 designates a DC motor for reciprocating a table (not shown) supporting the optical card 1 thereon in the track directions of the card (the directions shown by the bilateral arrow), and reference numeral 24 denotes an optical head for simultaneously applying three light beams to the optical card as shown in Figure 3. The construction of this optical head is similar to that of the optical head used with a conventional optical disc except that a diffraction grating for separating the light beam from a light source into three light beams is provided, and its detailed construction is not described herein. Reference numeral 25 designates a circuit for recovering information recorded on the tracks from a signal ., ' read by the optical head, as described in connection with Figures 2 and 3, reference numeral 26 denotes a comparator, reference numeral 27 designates a pulse operating circuit, reference numeral 28 denotes a setting circuit for determining a position to which the optical head is to be subsequently moved relative to the optical card, reference numeral 29 designates a stepper pulse, motor driver, and reference numeral 30 denotes a stepper pulse motor for moving the optical head 24 relative to the optical card 1.
When it detects the insertion of the optical card 1, the sensor 21 outputs a detection signal to the DC motor driver 22 and on the basis of this signal, the DC motor driver 22 drives the DC motor 23 to move the optical card 1 in the direction of movement of the track. Simultaneously, on the basis of a further detection signal from the sensor 21, the optical head 24 reads the information on two tracks of the optical card 1 while performing the auto-focusing and the auto-tracking function. From this information, the reproducing circuit 25 identifies the track number of each track and this information is supplied to the comparator 26.
When it receives the result of comparison from the comparator 26, the pulse operating circuit 27 supplies the pulse motor driver 29 with a signal of the next track to be accessed by the optical head, with the value set by the setting circuit 28 as a reference, and the puls~ motor driver 29 drives the pulse motor 30 the optical head 24 to access a predetermined track.
With the above-described apparatus, it is possible to carry out the method according to the present invention. In Figure 4, an arrangement in which the insertion of the optical card into the apparatus is detected to start a series of operations has been shown, whereas this need not always be the case. Thus the present method is of course applicable also to a case in which the optical card is already inserted in the apparatus, recording or reproduction of data has been carried out, and operation has been interrupted, whereafter ~70(~59 further recording or reproduction is again required.
~'
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS :
1. A method of positioning an optical head for recording or reproducing information on or from an optical card having a plurality of linearly extending tracks and position information written in areas at each end of each track, to a target position relative to the optical card, comprising the steps of:
instructing the optical head to move relative to the optical card and to record or reproduce information;
reciprocatively and linearly displacing the optical head relative to a track of the optical card on the basis of an instruction produced by said instructing step;
reading the position information written on the end area of the track on the optical card; and positioning the optical head to a target position relative to the optical card on the basis of the position information so read.
instructing the optical head to move relative to the optical card and to record or reproduce information;
reciprocatively and linearly displacing the optical head relative to a track of the optical card on the basis of an instruction produced by said instructing step;
reading the position information written on the end area of the track on the optical card; and positioning the optical head to a target position relative to the optical card on the basis of the position information so read.
2. A method of positioning an optical head for recording or reproducing information on or from an optical card having a plurality of linearly extending tracks and position information written correspondingly to each end area of each track, to a target position relative to the optical card, comprising the steps of:
detecting that recording or reproducing should be effected;
causing a light beam from the optical head to be accurately applied onto the track on the optical card;
moving the optical head and the optical card relative to each other in the direction of the track of the optical card;
reading the position information written on the end area of the track on the optical card; and positioning the optical head to a target position relative to the optical card on the basis of the read position information.
detecting that recording or reproducing should be effected;
causing a light beam from the optical head to be accurately applied onto the track on the optical card;
moving the optical head and the optical card relative to each other in the direction of the track of the optical card;
reading the position information written on the end area of the track on the optical card; and positioning the optical head to a target position relative to the optical card on the basis of the read position information.
3. A method according to claim 2, wherein two light beams are applied to two tracks of the card, and position information is read from both tracks, and, wherein the position information so read is compared to ascertain the direction in which the optical head is to be positioned.
4. An apparatus capable of positioning an optical head for recording or reproducing information on or from an optical card having a plurality of linearly extending tracks and position information written in areas at each end of each track, to a target position relative to the optical card, comprising:
an optical head movable relative to the optical card to record or reproduce the information on a track thereof;
means for reciprocatively and linearly moving the optical head and the optical card relative to each other in the direction of the track of the optical card on the basis of a signal from said instructing means;
means for reading the position information written on an area at one end of the track on the optical card; and means for positioning the optical head to a target position relative to the optical card on the basis of the position information so read.
an optical head movable relative to the optical card to record or reproduce the information on a track thereof;
means for reciprocatively and linearly moving the optical head and the optical card relative to each other in the direction of the track of the optical card on the basis of a signal from said instructing means;
means for reading the position information written on an area at one end of the track on the optical card; and means for positioning the optical head to a target position relative to the optical card on the basis of the position information so read.
5. Apparatus according to claim 4, wherein the optical head reproduces position information from the ends of two tracks of the card simultaneously, and the means for positioning the optical head positions it in a direction determined by comparing the position information from the two tracks.
6. An optical card comprising:
a plurality of tracking tracks;
a plurality of data tracks, each of said data tracks extending parallel to a tracking track; and position information for each track, said position information being written in duplicate solely in end areas at opposite ends of the data track to which it relates.
a plurality of tracking tracks;
a plurality of data tracks, each of said data tracks extending parallel to a tracking track; and position information for each track, said position information being written in duplicate solely in end areas at opposite ends of the data track to which it relates.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP072042/1985 | 1985-04-05 | ||
| JP60072042A JP2556465B2 (en) | 1985-04-05 | 1985-04-05 | Optical head access method for recording / reproducing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1270059A true CA1270059A (en) | 1990-06-05 |
Family
ID=13477941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000505632A Expired CA1270059A (en) | 1985-04-05 | 1986-04-02 | Method of detecting the position of an optical head |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP2556465B2 (en) |
| CA (1) | CA1270059A (en) |
| CH (2) | CH671475A5 (en) |
| DE (1) | DE3611334A1 (en) |
| FR (1) | FR2580085B1 (en) |
| GB (1) | GB2174531B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1294705C (en) * | 1986-04-09 | 1992-01-21 | Wataru Sakagami | Optical information recording medium and recording-reproducing apparatus |
| US4982391A (en) * | 1987-02-20 | 1991-01-01 | Canon Kabushiki Kaisha | Method and apparatus for accessing a desired track of a recording medium during a stopped state of recording or reproduction |
| JP2549664B2 (en) * | 1987-07-31 | 1996-10-30 | オリンパス光学工業株式会社 | Optical card device |
| JPH0610879B2 (en) * | 1988-07-08 | 1994-02-09 | シャープ株式会社 | Optical memory device |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4398223A (en) | 1955-06-14 | 1983-08-09 | Lemelson Jerome H | System for recording video information on a record card |
| US3518658A (en) * | 1964-12-16 | 1970-06-30 | Ibm | Digital comparison-to-analog signal converter |
| US3550085A (en) * | 1965-06-09 | 1970-12-22 | Daniel Silverman | Information system using arrays of multiple spot patterns |
| NL7212015A (en) * | 1972-09-04 | 1974-03-06 | ||
| DE2543276A1 (en) * | 1975-09-27 | 1977-03-31 | Licentia Gmbh | Reproduction system for data carried on tapes - has monochromatic light source and pick-up units for optical signals to be converted to audio output |
| FR2345769A1 (en) * | 1976-03-25 | 1977-10-21 | Blazevic Milos | AUTOMATIC RECORDING, READING AND TRANSLATION DEVICE AND CORRESPONDING MEDIA |
| CH612524A5 (en) * | 1976-12-28 | 1979-07-31 | Gretag Ag | Identification card with optically retrievable information stored in three-dimensional form |
| US4296491A (en) * | 1979-07-30 | 1981-10-20 | Atlantic Richfield Company | Information carrier having inter-track identification code information |
| GB2092791B (en) * | 1981-02-02 | 1984-12-05 | Smiths Industries Plc | Record carriers |
| US4402061A (en) * | 1981-10-15 | 1983-08-30 | Burroughs Corporation | Preformatted optical media for use in an optical memory system |
| US4519054A (en) * | 1982-06-03 | 1985-05-21 | News Log International, Inc. | Method for formatting optically encoded digital data on a substrate and the data record carrier formed thereby |
| US4534031A (en) * | 1982-08-02 | 1985-08-06 | News Log International | Coded data on a record carrier and method for encoding same |
| JPS59161524U (en) * | 1983-04-14 | 1984-10-29 | ティーディーケイ株式会社 | optical card |
-
1985
- 1985-04-05 JP JP60072042A patent/JP2556465B2/en not_active Expired - Lifetime
-
1986
- 1986-04-02 CA CA000505632A patent/CA1270059A/en not_active Expired
- 1986-04-04 FR FR8604863A patent/FR2580085B1/fr not_active Expired
- 1986-04-04 GB GB8608345A patent/GB2174531B/en not_active Expired - Lifetime
- 1986-04-04 DE DE19863611334 patent/DE3611334A1/en active Granted
- 1986-04-04 CH CH133786A patent/CH671475A5/fr not_active IP Right Cessation
-
1989
- 1989-04-04 CH CH164989A patent/CH674681A5/fr not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2580085B1 (en) | 1990-09-21 |
| JP2556465B2 (en) | 1996-11-20 |
| CH671475A5 (en) | 1989-08-31 |
| CH674681A5 (en) | 1990-06-29 |
| FR2580085A1 (en) | 1986-10-10 |
| JPS61230629A (en) | 1986-10-14 |
| DE3611334C2 (en) | 1992-06-25 |
| DE3611334A1 (en) | 1986-10-16 |
| GB2174531B (en) | 1990-05-30 |
| GB8608345D0 (en) | 1986-05-08 |
| GB2174531A (en) | 1986-11-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |