CA1072672A - Magnetic position marker for a tape recorder - Google Patents
Magnetic position marker for a tape recorderInfo
- Publication number
- CA1072672A CA1072672A CA269,555A CA269555A CA1072672A CA 1072672 A CA1072672 A CA 1072672A CA 269555 A CA269555 A CA 269555A CA 1072672 A CA1072672 A CA 1072672A
- Authority
- CA
- Canada
- Prior art keywords
- marking
- strip
- cassette
- tape
- magnetic
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 69
- 239000003550 marker Substances 0.000 title 1
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000000696 magnetic material Substances 0.000 claims abstract description 7
- 230000004044 response Effects 0.000 claims description 5
- 230000004907 flux Effects 0.000 abstract description 2
- 239000000969 carrier Substances 0.000 description 21
- 238000004804 winding Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- NTDLXWMIWOECHG-UHFFFAOYSA-N 7-labden-3beta,15-diol Natural products O1CC(O)(CO)C(O)C1OC1C(O)C(O)C(CO)OC1OC(C=1)=CC(O)=C(C(C=2)=O)C=1OC=2C1=CC=C(O)C=C1 NTDLXWMIWOECHG-UHFFFAOYSA-N 0.000 description 3
- NTDLXWMIWOECHG-YRCFQSNFSA-N apiin Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O)[C@H]1O[C@H]1[C@@H]([C@@](O)(CO)CO1)O)O)CO)C(C=1)=CC(O)=C(C(C=2)=O)C=1OC=2C1=CC=C(O)C=C1 NTDLXWMIWOECHG-YRCFQSNFSA-N 0.000 description 3
- NTDLXWMIWOECHG-WJAPLXOZSA-N apiin Natural products O([C@@H]1[C@@H](O)[C@H](O)[C@H](CO)O[C@H]1Oc1cc(O)c2C(=O)C=C(c3ccc(O)cc3)Oc2c1)[C@H]1[C@@H](O)[C@@](O)(CO)CO1 NTDLXWMIWOECHG-WJAPLXOZSA-N 0.000 description 3
- 241001249696 Senna alexandrina Species 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- 101100400378 Mus musculus Marveld2 gene Proteins 0.000 description 1
- 241001302210 Sida <water flea> Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229960001948 caffeine Drugs 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- RYYVLZVUVIJVGH-UHFFFAOYSA-N trimethylxanthine Natural products CN1C(=O)N(C)C(=O)C2=C1N=CN2C RYYVLZVUVIJVGH-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/34—Indicating arrangements
Abstract
Abstract of the Disclosure A cassette tape recorder including a device for making index marks on a strip denoting the position of magnetic tape relative to a magnetic head, the marking strip being on a cassette exterior surface and having magnetically alignable particles by which visible, magnetically erasable marks can be made. The marking device includes a controllable magnet for selectively magnetizing an element made of a soft magnetic material which conducts flux to the strip. In a magnetic tape cassette adapted for such apparatus a strip with magnetically alignable particles is arranged on at least one major flat wall of the cassette, so as to be readily visible.
Description
:~t~ 2 The invention relates to a recording and/or playback apparatus for a magnetic tape which cooperates with at least one scanning element (herein-after referred to as a tape recorder), and more particularly to a tape cassette recorder having a marking device for selectively applying index marks which identify the positio~ of a magnetic head relative to the magnetic tape in at least one marking zone of a marking carrier. Such tape recorders have at least one marking element which is movable along the marking zone in synchronism with the relative movement between the magnetic tape and the head.
Such apparatus is for example described in U.S. Patent No. 2,218,5~2 and is in particular intended for dictation purposes. The user of such apparatus can make optically identifiable marks in the form of punched-out slits in paper marking-carriers by using the marking elements of the marking device.
In addition, a number of other apparatus with marking devices and marking carriers are known, by means of which index marks are made in accord-ance with different methods, as by scribing on the marking carrier by the removal of a layer of a special material from the marking carrier, by burning in a mark on a thermographic marking carrier, and the like, for example, see U.S. Patent No. 2,898,112. All these devices are more or less intricate and expensive, demand a comparatively large amount of power for the applic-ation of the marks and produce marks on the marking carrier which cannot be erased, or are erasable only with great difficulty, so that a large number of interchangeable marking carriers must be suppli~d with such apparatus.
A carrier with magnetically alignable particles for the storage and visual read-out of information is also known from U.S. Pa~ent No.
3,683,382. This patent teaches that a visible image of a magnetic or elec-trostatic force field can be obtained by impressing the field on a continuous web or sheet of material having tiny liquid-containing chambers ha~ing field-alignable particles in the liquid, and gives examples of use of such a material for making visible graph lines on a strip chart recorder, x-y recorder or the like.
The object of the invention is to provide an easily constructed tape recorder apparatus by which index marks can be readily made and erased.
According to the invention, a strip having magnetically alignable particles which store visible marks is mounted on an external surface of tlle cassette in a tape recorder, and the marking device comp~ises a con-trollable magnet for selectively magnetizing a marking element made of a soft-magnetic material which conducts magnetic flux to the strip.
Broadly, therefore, the present invention comprises a magnetic tape cassette recording system, comprising ~a) a tape casse~te comprising at least one wall having an exterior surface; a planar marking strip affixed to said exterior surface, said strip having at least one marking zone con-taining magnetically alignable particles which store visually discernible marks in response to application of a magne~ic field perpendicular to said strip, said marks being magnetically erasable by applica~ion of a magnetic field parallel to the plane of the strip; at least one hub rotatably mounted in said cassette; and a length of magnetic tape wound on said hub, and ~b) a tape recorder comprising a housing having a recessed portion in which said cassette is placed, so arranged that said strip is visible; a magnetic head;
means for driving said tape past said head for recording or playing back information on the tape; a marking element made of a soft magnetic material and having a free end arranged to be visible; means for moving said marking element in a given direction along the marking zone in synchronization with movement of a tape past the head, said free end oriented perpendicular to :
said strip; means for selectively magnetizing said marking element; and -means for selectively applying a magnetic field parallel to the plane of the strip of a cassette of the type described in paragraph (a).
An advantage of the invention is that the marking element need not ~;
exert mechanical force on the marking carrier. Further, *he process in the marking carrier is magnetically reversible, so *hat marks can be magnetically erased. As a result the user of a tape recorder according to the inven~ion .~
~ ' ~ J'~ 6 ~'~
need no longer have a large mlmber of marking carriers at his dispo~al because the strip on the cassette is reusable.
Because of its particularly simple construction in a preferred embodiment the controllable magnet is constituted by a permanent magnet which is pivotable from a rest position towards the marking element. In a recorder having two marking elements which are each associated with a different marking zone of the marking carrier the permanent magnet can then be pivoted from i~s rest position towards either the one or ~he other marking element in an effective manner. Thus, marks can be made by simply pivoting a permanent magnet, with no appreciable forces required.
A very simple construction is also obtained when in accordance with the invention the controllable magnet is constituted by a coil mounted on the marking element which coil can be energized electrically.
For erasing marks made on such a marking strip an erase device is used which produces a magnetic field whose lines of force extend substantial-ly in the plane of the strip, as described in the cited ~.S. Patent No.
3,683,682. In this respect in a preferred embodiment of an apparatus in accordance with the invention a permanent magnetic and/or electromagnetic erase device has a guide track for the passage of the marking strips through the magnetic field. Thus, a marking strip can easily be erased before it is used, by passing it for example manually along the guide track through the magnetic field of the erase device, the guide track defining a suitable location relative to the magnetic field. For utmost simplicity of operation the guide track is constituted by a drop shaft with an entrance opening and an exit opening.
The invention also relates to a cassette for magnetic tape compris-ing a housing having at least one wall having an exterior surface; a planar marking strip affixed to said exterior surface, said strip having at least one marking zone containing magnetically alignable particles which store 30 visually discernible marks in response to application of a magnetic field perpendicular to said-strip, said marks being magnetically erasable by '"~
-4- ~
;.~
~ ' ~
~ 6 ~ ~
application of a magnetic field parallel to the plane of the strip; at least one hub rotatably mounted in said cassette; and a length of magnetic tape wound on said hub.
The special strip may simply be glued to the outer surface of the top, or major flat cassette wall. Thus the casse~te and the marking carrier form a single unit, whose two parts are jointly handled, so that there is no risk that a marking carrier belonging to a specific cassette is mislaid or is interchanged with other carriers. In particular when the cassette in accordance with the invention is used as a dictation cassette this yields the important advantage that a person transcribing dictation on the cassette can directly read marks on the cassette, such as marks denoting the beginning and end of the dictation, special instructions with respect to inserts in the dictation etc.
Combining a magnetic tape cassette with a marking strip utilizing magnetically alignable particles, furthermore, yields the advantage that when the marks are made no mechanical forces are exerted on the marking carrier ` and the cassette -:
-;
.
AP]IN.8~9ll ~ J~ 16-12-1976 respectively. ~s such a special marlcin~ carrier can be erased~ it is ensured that the markiIlg carrier is re usable, As an alternati~e, the mar~ing carrier may be disposed detachably on the wall of the cassette, so that this carrier can simply be replaced, for example in the event of damage during transport o~ the cassettes.
For this purpose the marking carrier is suitably placed in a compartment provided in a wall of the cassette.
It may also be effective to attach marking carrier to the cassette wall by at least a ~etachable cllp ~ich can be fitted onto the cassette.
The invention will be described in more detail with re~erence to the drawing which shows some embodiments of the invention to which the invention is not limitedc . Figo 1 schematically shows those parts of a recording and/or playback apparatus for a magnetic tape accommodated ln a cassette~ which apparatus is to be used in particular as a diotation apparatus, which are essential for the invention.
Fig. 2 shows the apparatus of Fig. 1 in ` cross-section in accordance with the line II-II.
Fig. 3 is a cross-section of a second em-bodiment of a cassette apparatus in accordance with thein~ention~
Fig. 4 shows a further embodiment of a cas~
sette apparatus in accordance with the in~ention9 - Fig. 5 shows an e~ample of a cassette with magnetic tape which is suitable for use in a cassette apparatus in accordance with the invention? and Fig, 6 schematically shows a ~eel-to-reel .
~PHN 8294 -'i A ~t^lrt~ ^J~p app~ra~ls in accordance with the i.nvention~ in which the marking carrier is disposed on a stationary part o~ the apparatus, the apparatus comprising a movable erase device ~or the marking carrier.
In accordance with Figs. 1 and 2 a recording and/or pla~back apparatus, to be us~d in par-ticular as a dic'tation apparatus~ comprises a housing 1 with a recessed portion 2 in which a cassette 4 is placed which contains a magnetic tape 30 Drive spindles 5, 6 located in the apparatus cooperate with winding hubs 7~ 8 in ,the cassette 4 in a conventional manner, so that the 'magnetic tape can beunwound ~rom one winding hub and wound onto the o-ther winding hub. The magnetic tape 3 then runs along a narrow side 9 of the cassette in which openings 10~ 11 are ~ormed~ through whi.ch scan-ning elements extend into the apparatus, in the present instance an erase head 12 and a recording~playback head 13, which co-operate with the magnetic tape. The : scanning elements are mounted on a base 14, which is movable in the apparatus in the direction of the double arrow 1~. Actuation means 16 which can be operated by a control element ~not shown) engage with the base 14, 80 that the scanning element can be wi~hdrawn from the cassette into a~!rest position, In the situation shown in Fig. 1 and Fig9 2 the scanning elements are in contact with the magnetic tape, whilst it is assumed that magnetic tape has already been transported from the hub 7 to the hub 8, The apparatus is'pro~ided with a marking ` ~ 30 de~ice ~or a marking carrier on which marks can be made in a selective manner~ which marks denote the relati~e position o~ the scanning elements with respect to the -7~
.
APIIN, 829l~
~ Y~ l6-12-1976 magl1etic tapc, so that ~or exam~le i~ the apparatus is ~sed for dictation purposes the beginning and the end of the dictation or a correction can be identified. For this purpose a marking carrier 19, 20 is provided optically readable on each of the two walls 17, 18 of the cassette 4~ which walls constitute the ma~or surfaces~ said car-rier consisting of a carrier with magnetically orienta-table particles for the storage and optical read-out o~
a mark. In such a carrier the magnetically orientatable particles~ depending on whether they have been exposed to a magnetic field which extends in the plane of the carrier or perpendicular to said plane, may assume two different orientations, so that in one orientation they reflect incident light and in the other orientation they diffuse the incident light in the carrier material where it is then absorbed so that -the carrier is bright in the first instance and is dark in the second instance. In the present example the marking carriers take the ~orm - of strips which are glued in position parallel to the longitudinal direction o~ the cassette in corresponding re~esses formed in the walls 17, 18 of the cassette.
Each of the two marking carriers then corresponds to a direction of transport of the magnetic tape from the one winding hub to the other~ depending on the position in which the cassette has been inserted into the appara tus~ the marking carrier which ~aces the outside of the apparatus and which is visible to the user being in the operating condition. Thus, there is a fixed connection between each cassette and marking carrier, so $hat they cannot be mislaid or be interchanged9 for example during transport of a cassette. Since with such special marking carriers the magnetically stored and opticall~ readable .
- ~, APIIN.8294 ~ 7~ 16-12-1976 marl~s can be erascd magneticall~ becatIse of the rever-sible orientation proc~ss of tlle particles of the car-rier, the marlcing carriers even in the case o~ frequent use of a cassette, are always r~-usable, after erasure, which will be described in more detail hereinafter.
For making marks on the relevant marking carrier on the cassette a marking device 21 is pro~ided~
which comprises a magnetizing device 22 for two marking elements 23, 24 which each correspond to a mark:ing zone 1 o 25 and 2 6 respectively on the marking carrier and which can be moved along these marking zones in synchronis~ -~
with the relative movement between the magnetic tape 3 and the scanning elements 12, 13 which co-operate there with. For this purpose, the marking device comprises a stationary spindle 27 along which a block 28 of a non-magnetizable material 9 in the present case a plastic is movable. In this block the two marking elements 23 and 24 of a soft-magnetic material are embedded, the portions 299 30 and 31, 32 projecting from the block 28, The por-tions 30 and 32 are guided in slots 33 and 34, which are formed in a ridge 35 provided on the housing, and they pass into bent pin-shaped free ends 36 and 37, which terminate directly above the marking carrier 19 which is located on the cassette 4. Furthermore, a semic r.cular threaded portion 38 is formed in the block 28, which co-operates with a threaded spindle 39 9 which is rotatably Journalled in bearlngs 40, 41 mounted on $he base 14, By moving the base 14 from the operating posi-tion to the rest positîon; the scanning elements 12, 13 being with-drawn from the cassette~ the connection between the threaded spindle 39 and the block 28 is eliminated, in which case a spring 43 which engages with the block 28 _9 .
y,r~, APITN . 829L~
16-12-1~76 i9 eliminated, in which case a spring 43 which engages with the block 28 ~ia a belt 42~ moves said block into a rest position which is defined by a stop 44 on the housing 1~ after a projection 46 formed on *he base 14 and having a ramp 45 has released this rest position of the block 28. In Fig. 1 this rest position is indicated by dotted lines 47. On the threaded spindly 39 a disk 48 is fitted which co-operates with a slipping clutch lining 499 which is mounted on a pulle~ 50, whlch disk-is freely rotatablo on the threaded spindlc. From this pulley 50 a belt 51 runs to an apparatus part, not `~ shown, which rotates during transport of the magnetic tape, for example a second puller which is mounted on the winding spindle 6. In this way the block 28 together with the marking elements 23 and 23 is moved along the spindle 27 in synchronism with the relative movement ; between the magnetic tape and the scanning element, the ~ree ends 36, 37 of the marking elements covering the corresponding marking zones 25 and 26 o~ the marking carrier 19. With the aid of a scale 52 which is printed OIl the marking carriers it is then also ~isible, in a ~imilar way as with a counter~ how much magnetic tape lS contained on the winding hubs7 and 8 respectively.
The magnetizing de~ice 22 comprises a rod-shaped axially magnetized permanent magnet 53 which is ~ounted on an arm 54 which is constituted by a projection o~ a ring 55, which is plvotably Journalled around a hollow cylindrical projection 56 on the klock 2B and which is ooaxial uith the spindle 27. This ring 55 -~ 30 furthermore comprises a second projection in -the form o~ an arm 57 with a fork-shaped end 58~ which includes a bar 59 which at both ends is pivotabl~ journalled to APIIN.8294 7~ 16--12-1976 the spindle 27 by meàns o* connecting port:ions 60 and 61 on the spindle 27, whilst furthermore a handle 62 is connected to the portion 60. In this way, by tilting the handle 62 and thus the bar 59, the arm 57 and the ring 55 as well as the arm 54 and the permanent magnet 53 is pi~otable in any arbitrary position of the bloclc 28;
so that the permanent magnet can be made to engage either with the projection 29 of the ma~k:ing elemen-t 23 or the projection 31 of the marking element 24. A stop means 63 which co-operates with the bar 5.9, as is sho~ in Figs. 1 and 2, defines a rest position of the actuation device ~or the permanent magnet, in which position this magnet is kept remote from the two projections 29 and 31 of the two marking elements When the apparatus is put into operation the ; base 14 is in its rest position7 in which position the scanning elements 129 13 disposed on it are wi~hdra~n from the recess 2, the block 28 with the marking elements 23 and 24 then also being in the rest position, in which said block~ as stated~ engages with the stop 44, In this rest position of the block 28 the two marking elements, : as shown in Fig, 1~ are disposed beside the recess 2, so that a cassette 4 ~can be placed into the said recess - unimpeded. Subsequently, the base 14 is moved into the operating position, the scanning elements 12, 13 then penetrating the cassette and engaging with the magnetic tape. Simultaneously with this mo~ement o~ the base 14 the block 28 is mo~ed so far in the direction of the arrow 64 via the ramp 45 formed on the projection 46 .
of said base,which ramp then engages with said block~
that the blook comes clear of the rampt after which~
: as the ba~e 14 mo~es on~ the connection between the .
1~-12~1976 threadecl spindle 39 and the threaded porti.on 38 of the block 28 is established. In this position o~ the block 28, indicated by the dotted lines 65 in Fig. 1~ the marking elements 23, 24 have assumed their initial posi-- 5 tion above the marking carrier 19. T~en the drive means for the transport Or the magnetl.c tape from the hub 7 to the hub 8 is now s~itched on, steps having been taken to ensure that, if necessary the tape is automatically wound completely OlltO the winding hub r7~ tha block 28 with the marking elements 239 24 synchronously follows the movement o~ the magnetic tape by means of the threaded spindle 39 which is then also dri~en, the *ree ends 36, 37 of the marking elements then covering the ; marking zones 25, 26 on the marking carrier.
If a specific point of the magne-tic tape in respect of its position relative to the sc~nning element is to be identified by means on a mark in the marking zone 25 or 26, the lever 62 is pivoted so that the per-manent magnet 53 is moved against the projection 29 of the marking element 23 or the projection 31 of the - marking element 24. As a result, the rele~ant marking element is magnetized so that t~e magnetic field ~hich emanates from the ~ree end 36 or 37 respecti~ely passes through the marking carrier substantially at right angles to the plane of the said carrier~ the magnetically orientatable particles o~ this carrier in the underlying area of the marking carrier being influenced in such a way that they are re-oriented compared with their ori-ginal orientation, so that at this point an optically visible mark is obtained and is recorded. Thus, such a mark can be made without mechanically loading any com-: ponent~ neither the marking elements nor the marking .
~ -12 , ~ APHN 8294 carrier~ L~y si.mply pi.voting a permanen-t m~gnet.
~ s the magn~tic orient~tion o~ the particles of themarking carrier is re~ersible, such marks can also be erased, which is ef:~ected with the aid o~ a magnetic field~ which then extends substantiall~ in the plane o~
themarking carrier. In the simplest case marks can be erased ~ith the aid of an axiallymagnetized rod magnQt~
which is mamlall~ passed over the marking carrier with the circum~erential sur~ace transverse thereto. Thus, - 10 such a marking carrier is re-usable 9 which is an essen-tial ad~antage~ because it is no longer nccessary to have a large number o~ interchangeable marking carriers at one's disposal ~or such an apparatus. Another impor-tant advantage is .~urthermore that those who have to transcribe a dictation from such a cassette can directly read the marks from the cassette, which marks denote .~or example the beginning and end o~ a dictation, or special nstructions relating to inserts in the dictation etc.
In th~ second embodiment of E`ig~ 3 the marking carriers 19, 20 which contain the mag~etically orientatable particles are each inserted in a compart-. ment 66~ 67 ~ormed in the walls 17 and 18 of the cas-sette 40 In the present case the two compartments each have a window 68 and 69 respectively for opticall~ read-ing the marking carrier. In the case that the compa~t-ments are made o~ a transparent material~ such windows may be dispensed with.
The marking device again comprises a block 28 which is movable along a stationar~ spindle 27 and which co-operates with a threaded spindle 39 with a semi-circular threaded portion 38, ~Jhich spindle is dri~en in synchronism with the transport o~ the magnetic tape.
'' . .
-: ~13--- - . . .
t~ AP~IN,8291~
A U-shaped bracket 71, whose leg 70 is parallel to the spindle 27, is pivotable in the apparatus and a spring 72 loads the part 70 of the bracket, which part runs in a groove 73 of the block 28, in such a way that a COll-nection between the threaded portion 38 and the threadedspindle 39 is guarante~d. As marking ~lement a hook-shaped pin 74 of a so~t magnetic material is mounted in the block 28, whose ~ree end 75 e~tends over the marking carrier 19 on the cassette 4, With an actuating element 76~ which acts on the bracket 71 via a rod 77 this bracket is pivotable against the action of the spring 72; the block 28 -then also being pivoted about the spindle 27 and the marking elemen-t 74 thus being moved beyond the range of the cassette, as is indicated by the dotted lines 78 in Fig. 3. Thus, the marking ele-ment 74 does not impede the insertion or removalvof a cassette into or from the apparatus.
The magnetizing device 22 for the marking element 74 is constituted by a coil 79 provided on the element, which via two slip contacts 80~ 81 makes elcc-trical contact with two contact tracks 82~ 83 provided in the apparatus, The two contact tracks are connected to anenergizing circuit 84, whioh includes a switch 85 which can be closed upon actuation o~ an actuation ele-ment 86~ When the switch 85 is closed current will flo~through the coil 79, independentl~ of the instantaneous posltion of the block 289 so that the magnetic field produced by the coil is passed from the marking element 74 *o the marking carrier 19 and passes through the plane .
o~ said carrier substantially at right angles thereto~
which at the location of the marking carrier results in - a re-orientation o~ the magnetically orientatable particles, ` ' . `
~ r~ ~ IIN 8~94 so that ~gain an opticàll~ visible mark is obtained and is recorded.
The apparatus of Fig. 3 is provided with an erase device 87 for the marking carrier.For this purpose an axially magnetized rod magnet `89 whose axis is substantiall~ parallel to the housing sur~ace is fitted in a recess 88 ~ormed in the housing I of the apparatus, for example in that said rod in the recess 88 is embedded in a plastic 90 Thus~; the magnet pro-duces a magnetic field 9I which extends outside theapparatus, which field may be used as an erase field for the marking carriers on the cassette. For erasure a cassetta with marking carriers is passed through the erase field by hand, in such a way that this field passes through the plane of the marking carriers, For defining the relevant paths to be followed by the mark-ing carriers ~n conjunction with the cassette during passage through the alternating field, a guide track for a cassette is provided on the housing I above the per-manent magnet 89, which track consists of a channel 92which is adapted to the cross-section of the cassette, along whlch channel a cassette can be moved by hand in the dlrection of the arrow 93, Thus~ the position of the marking carriers 19 and 20 relative to the erase field 91 is accurately defined, so that perfect erasure .: .
is guaranteed. A cassette may also be moved automatically along such a guide track.
In the embodiment of Fig. 4 the marking carrier 19 which contains the magneticall~ orientatable .
- 30 particles is mounted on a narrow side wall 94 of the cassette 4~ preferably on that wall which faces the narrow side 9 through which the scanning elements ~ r the ' '- ' ' ~PIIN.8294 ~ 12-1976 magnetic t~pe cnter.`:[n this c~se the cassette 4 is placed in a sha~t-shaped cassette conlainer 959 which is pivoted to the apparat~s~ whos~ wall 96 which extends parallel to the marking carrier 19 has an opening 97 for the pas-sage of the two free ends of the two marking elemen-ts Z3, 24. The two marking elements each act on one half of the marking carrier, so that when the caæsette is turned over9 they cover the other half of the marking carrier.
In order to make the marking carrier visible to the user o~ the apparatus, the housing I has an opening 98 below which a mirror 99 is sui-tably arranged. If d~sired, an illuminating device may be providedO
In this apparatus the erasing device 87 comprises a flat coil 100 which can be energized electrically so as to produce the magnetic alternating field through which a cassette can be passed together with the marking carrier, for which purpose again a guide track is provided which in this case takes the ~orm of a shaft 101 which is adapted to the cross-section o~ the cassette, which has an entrance opening 102 and an exit opening l03~ and which extends through the ~lat coil 100. For erasing a marking carrier the relevant cassette is moved in the direction o~ the arrow 104 into the entrance opening 102, after which the cassette falls through the shaftand remains at the bottom 105 thereof in front of the exit 103~ from which the cassette can be removed by hand. The marking carrier has then passed through the erase field in such a way that the erase field passes through the carrier in the plane of the carrier, so that the marks recorded on the marking .
carrier are erased.
In an embodiment o~ a cassette shown in ~ -- ; . ,~ ,..... . . ..
f~ Ap~IN.82gll Fig, 5 a marking carrier is secured to each of the two ~alls whlch constitute the major sur~aces with the aid of a U-shaped cliplO6 of a transparent material which partly covers the two walls. In ~ig. 5 the wall 17 and the marking carrier l9 are then visible~ For fitting the clip onto the cassette a snap connection is provided which consists of a projection 108 ~ormed at the base 107 o~
the U-shaped clip, which projection en~ages with a recess 109 ~hich is ~ormed in a narrow side wall 94 o~ the cas-sette, This enables the marking carrier to be exchangedin a simple way, the sida walls o~ the clip also ~orming a protect:ion ~or the marking carrier. Such a cassette together with the marking carrier can also be passed through an erase device. However~ it is alternatively ; 15 possible to pass only the marking carriers through an erase de~ice, Furthermore, it ~s possible in the case o~ a cassette which is located in the apparatus in the operating position, to erase the mar~ing carriers on this cassette with the aid of an erase device which is movably disposed~on the apparatus.
In the embodiment o~ Fig. 6 the marking carrier 19 with the magnetically orientatable particles is secured to a bracket 110 of a non~magnetizable ma-terial which is mounted on the apparatus, which bracket is situated underneath a window 111 formed i~ the appa-- ratus housing 1. Associated with the marking carrier is a marking element 23 which is movable in synchronism with the relative movement between the magnetic tape and the scanning elements, which marking element can be magneti~ed ~or the purpose o~ ma~ing in a manner not shown.
` For erasing marks a movable erase device 112 :. . .
, . . , , -. . .. . . .
~ t~. 16 12-1976 is prov:ided, whi ch C omprises a ~lat coil -113, which can.
be energizcd electrically and ~hich extends around the bracket 110~ and a U-shaped permanent magnet 114, which extends around the coil, which -two parts 113, 114 are mounted or a base 115. Said base 115 comprises a handle 116 which projects through a slot 117 which is formed in the apparatus housing and which extends parallel to the bracket 1l0. Bymoving the handl.e 116 along the slot 117 the erase device can be moved over the marking carrier and underneath the marking element 23, Thus, the marking carrier is ~ery ef~ectively erased by two mutually per-pendicular magnetic fields which extend in the plane o~
the marking carrier9 namely by the ~ield of the flat coil and by that of the permanent magnet, through a corresponding reorientation o~ the magnetic particles.
Further modi~ications to the embodimerts described hereinbefore are possible within the scope of the in~ention. In this respect it is to be noted that the marking carrier may-also ha~e a shape other -than that of a strip, for example a rourd shape with concen~
~: tric marking zones.
' . ' '. ' ' ': -" ,
Such apparatus is for example described in U.S. Patent No. 2,218,5~2 and is in particular intended for dictation purposes. The user of such apparatus can make optically identifiable marks in the form of punched-out slits in paper marking-carriers by using the marking elements of the marking device.
In addition, a number of other apparatus with marking devices and marking carriers are known, by means of which index marks are made in accord-ance with different methods, as by scribing on the marking carrier by the removal of a layer of a special material from the marking carrier, by burning in a mark on a thermographic marking carrier, and the like, for example, see U.S. Patent No. 2,898,112. All these devices are more or less intricate and expensive, demand a comparatively large amount of power for the applic-ation of the marks and produce marks on the marking carrier which cannot be erased, or are erasable only with great difficulty, so that a large number of interchangeable marking carriers must be suppli~d with such apparatus.
A carrier with magnetically alignable particles for the storage and visual read-out of information is also known from U.S. Pa~ent No.
3,683,382. This patent teaches that a visible image of a magnetic or elec-trostatic force field can be obtained by impressing the field on a continuous web or sheet of material having tiny liquid-containing chambers ha~ing field-alignable particles in the liquid, and gives examples of use of such a material for making visible graph lines on a strip chart recorder, x-y recorder or the like.
The object of the invention is to provide an easily constructed tape recorder apparatus by which index marks can be readily made and erased.
According to the invention, a strip having magnetically alignable particles which store visible marks is mounted on an external surface of tlle cassette in a tape recorder, and the marking device comp~ises a con-trollable magnet for selectively magnetizing a marking element made of a soft-magnetic material which conducts magnetic flux to the strip.
Broadly, therefore, the present invention comprises a magnetic tape cassette recording system, comprising ~a) a tape casse~te comprising at least one wall having an exterior surface; a planar marking strip affixed to said exterior surface, said strip having at least one marking zone con-taining magnetically alignable particles which store visually discernible marks in response to application of a magne~ic field perpendicular to said strip, said marks being magnetically erasable by applica~ion of a magnetic field parallel to the plane of the strip; at least one hub rotatably mounted in said cassette; and a length of magnetic tape wound on said hub, and ~b) a tape recorder comprising a housing having a recessed portion in which said cassette is placed, so arranged that said strip is visible; a magnetic head;
means for driving said tape past said head for recording or playing back information on the tape; a marking element made of a soft magnetic material and having a free end arranged to be visible; means for moving said marking element in a given direction along the marking zone in synchronization with movement of a tape past the head, said free end oriented perpendicular to :
said strip; means for selectively magnetizing said marking element; and -means for selectively applying a magnetic field parallel to the plane of the strip of a cassette of the type described in paragraph (a).
An advantage of the invention is that the marking element need not ~;
exert mechanical force on the marking carrier. Further, *he process in the marking carrier is magnetically reversible, so *hat marks can be magnetically erased. As a result the user of a tape recorder according to the inven~ion .~
~ ' ~ J'~ 6 ~'~
need no longer have a large mlmber of marking carriers at his dispo~al because the strip on the cassette is reusable.
Because of its particularly simple construction in a preferred embodiment the controllable magnet is constituted by a permanent magnet which is pivotable from a rest position towards the marking element. In a recorder having two marking elements which are each associated with a different marking zone of the marking carrier the permanent magnet can then be pivoted from i~s rest position towards either the one or ~he other marking element in an effective manner. Thus, marks can be made by simply pivoting a permanent magnet, with no appreciable forces required.
A very simple construction is also obtained when in accordance with the invention the controllable magnet is constituted by a coil mounted on the marking element which coil can be energized electrically.
For erasing marks made on such a marking strip an erase device is used which produces a magnetic field whose lines of force extend substantial-ly in the plane of the strip, as described in the cited ~.S. Patent No.
3,683,682. In this respect in a preferred embodiment of an apparatus in accordance with the invention a permanent magnetic and/or electromagnetic erase device has a guide track for the passage of the marking strips through the magnetic field. Thus, a marking strip can easily be erased before it is used, by passing it for example manually along the guide track through the magnetic field of the erase device, the guide track defining a suitable location relative to the magnetic field. For utmost simplicity of operation the guide track is constituted by a drop shaft with an entrance opening and an exit opening.
The invention also relates to a cassette for magnetic tape compris-ing a housing having at least one wall having an exterior surface; a planar marking strip affixed to said exterior surface, said strip having at least one marking zone containing magnetically alignable particles which store 30 visually discernible marks in response to application of a magnetic field perpendicular to said-strip, said marks being magnetically erasable by '"~
-4- ~
;.~
~ ' ~
~ 6 ~ ~
application of a magnetic field parallel to the plane of the strip; at least one hub rotatably mounted in said cassette; and a length of magnetic tape wound on said hub.
The special strip may simply be glued to the outer surface of the top, or major flat cassette wall. Thus the casse~te and the marking carrier form a single unit, whose two parts are jointly handled, so that there is no risk that a marking carrier belonging to a specific cassette is mislaid or is interchanged with other carriers. In particular when the cassette in accordance with the invention is used as a dictation cassette this yields the important advantage that a person transcribing dictation on the cassette can directly read marks on the cassette, such as marks denoting the beginning and end of the dictation, special instructions with respect to inserts in the dictation etc.
Combining a magnetic tape cassette with a marking strip utilizing magnetically alignable particles, furthermore, yields the advantage that when the marks are made no mechanical forces are exerted on the marking carrier ` and the cassette -:
-;
.
AP]IN.8~9ll ~ J~ 16-12-1976 respectively. ~s such a special marlcin~ carrier can be erased~ it is ensured that the markiIlg carrier is re usable, As an alternati~e, the mar~ing carrier may be disposed detachably on the wall of the cassette, so that this carrier can simply be replaced, for example in the event of damage during transport o~ the cassettes.
For this purpose the marking carrier is suitably placed in a compartment provided in a wall of the cassette.
It may also be effective to attach marking carrier to the cassette wall by at least a ~etachable cllp ~ich can be fitted onto the cassette.
The invention will be described in more detail with re~erence to the drawing which shows some embodiments of the invention to which the invention is not limitedc . Figo 1 schematically shows those parts of a recording and/or playback apparatus for a magnetic tape accommodated ln a cassette~ which apparatus is to be used in particular as a diotation apparatus, which are essential for the invention.
Fig. 2 shows the apparatus of Fig. 1 in ` cross-section in accordance with the line II-II.
Fig. 3 is a cross-section of a second em-bodiment of a cassette apparatus in accordance with thein~ention~
Fig. 4 shows a further embodiment of a cas~
sette apparatus in accordance with the in~ention9 - Fig. 5 shows an e~ample of a cassette with magnetic tape which is suitable for use in a cassette apparatus in accordance with the invention? and Fig, 6 schematically shows a ~eel-to-reel .
~PHN 8294 -'i A ~t^lrt~ ^J~p app~ra~ls in accordance with the i.nvention~ in which the marking carrier is disposed on a stationary part o~ the apparatus, the apparatus comprising a movable erase device ~or the marking carrier.
In accordance with Figs. 1 and 2 a recording and/or pla~back apparatus, to be us~d in par-ticular as a dic'tation apparatus~ comprises a housing 1 with a recessed portion 2 in which a cassette 4 is placed which contains a magnetic tape 30 Drive spindles 5, 6 located in the apparatus cooperate with winding hubs 7~ 8 in ,the cassette 4 in a conventional manner, so that the 'magnetic tape can beunwound ~rom one winding hub and wound onto the o-ther winding hub. The magnetic tape 3 then runs along a narrow side 9 of the cassette in which openings 10~ 11 are ~ormed~ through whi.ch scan-ning elements extend into the apparatus, in the present instance an erase head 12 and a recording~playback head 13, which co-operate with the magnetic tape. The : scanning elements are mounted on a base 14, which is movable in the apparatus in the direction of the double arrow 1~. Actuation means 16 which can be operated by a control element ~not shown) engage with the base 14, 80 that the scanning element can be wi~hdrawn from the cassette into a~!rest position, In the situation shown in Fig. 1 and Fig9 2 the scanning elements are in contact with the magnetic tape, whilst it is assumed that magnetic tape has already been transported from the hub 7 to the hub 8, The apparatus is'pro~ided with a marking ` ~ 30 de~ice ~or a marking carrier on which marks can be made in a selective manner~ which marks denote the relati~e position o~ the scanning elements with respect to the -7~
.
APIIN, 829l~
~ Y~ l6-12-1976 magl1etic tapc, so that ~or exam~le i~ the apparatus is ~sed for dictation purposes the beginning and the end of the dictation or a correction can be identified. For this purpose a marking carrier 19, 20 is provided optically readable on each of the two walls 17, 18 of the cassette 4~ which walls constitute the ma~or surfaces~ said car-rier consisting of a carrier with magnetically orienta-table particles for the storage and optical read-out o~
a mark. In such a carrier the magnetically orientatable particles~ depending on whether they have been exposed to a magnetic field which extends in the plane of the carrier or perpendicular to said plane, may assume two different orientations, so that in one orientation they reflect incident light and in the other orientation they diffuse the incident light in the carrier material where it is then absorbed so that -the carrier is bright in the first instance and is dark in the second instance. In the present example the marking carriers take the ~orm - of strips which are glued in position parallel to the longitudinal direction o~ the cassette in corresponding re~esses formed in the walls 17, 18 of the cassette.
Each of the two marking carriers then corresponds to a direction of transport of the magnetic tape from the one winding hub to the other~ depending on the position in which the cassette has been inserted into the appara tus~ the marking carrier which ~aces the outside of the apparatus and which is visible to the user being in the operating condition. Thus, there is a fixed connection between each cassette and marking carrier, so $hat they cannot be mislaid or be interchanged9 for example during transport of a cassette. Since with such special marking carriers the magnetically stored and opticall~ readable .
- ~, APIIN.8294 ~ 7~ 16-12-1976 marl~s can be erascd magneticall~ becatIse of the rever-sible orientation proc~ss of tlle particles of the car-rier, the marlcing carriers even in the case o~ frequent use of a cassette, are always r~-usable, after erasure, which will be described in more detail hereinafter.
For making marks on the relevant marking carrier on the cassette a marking device 21 is pro~ided~
which comprises a magnetizing device 22 for two marking elements 23, 24 which each correspond to a mark:ing zone 1 o 25 and 2 6 respectively on the marking carrier and which can be moved along these marking zones in synchronis~ -~
with the relative movement between the magnetic tape 3 and the scanning elements 12, 13 which co-operate there with. For this purpose, the marking device comprises a stationary spindle 27 along which a block 28 of a non-magnetizable material 9 in the present case a plastic is movable. In this block the two marking elements 23 and 24 of a soft-magnetic material are embedded, the portions 299 30 and 31, 32 projecting from the block 28, The por-tions 30 and 32 are guided in slots 33 and 34, which are formed in a ridge 35 provided on the housing, and they pass into bent pin-shaped free ends 36 and 37, which terminate directly above the marking carrier 19 which is located on the cassette 4. Furthermore, a semic r.cular threaded portion 38 is formed in the block 28, which co-operates with a threaded spindle 39 9 which is rotatably Journalled in bearlngs 40, 41 mounted on $he base 14, By moving the base 14 from the operating posi-tion to the rest positîon; the scanning elements 12, 13 being with-drawn from the cassette~ the connection between the threaded spindle 39 and the block 28 is eliminated, in which case a spring 43 which engages with the block 28 _9 .
y,r~, APITN . 829L~
16-12-1~76 i9 eliminated, in which case a spring 43 which engages with the block 28 ~ia a belt 42~ moves said block into a rest position which is defined by a stop 44 on the housing 1~ after a projection 46 formed on *he base 14 and having a ramp 45 has released this rest position of the block 28. In Fig. 1 this rest position is indicated by dotted lines 47. On the threaded spindly 39 a disk 48 is fitted which co-operates with a slipping clutch lining 499 which is mounted on a pulle~ 50, whlch disk-is freely rotatablo on the threaded spindlc. From this pulley 50 a belt 51 runs to an apparatus part, not `~ shown, which rotates during transport of the magnetic tape, for example a second puller which is mounted on the winding spindle 6. In this way the block 28 together with the marking elements 23 and 23 is moved along the spindle 27 in synchronism with the relative movement ; between the magnetic tape and the scanning element, the ~ree ends 36, 37 of the marking elements covering the corresponding marking zones 25 and 26 o~ the marking carrier 19. With the aid of a scale 52 which is printed OIl the marking carriers it is then also ~isible, in a ~imilar way as with a counter~ how much magnetic tape lS contained on the winding hubs7 and 8 respectively.
The magnetizing de~ice 22 comprises a rod-shaped axially magnetized permanent magnet 53 which is ~ounted on an arm 54 which is constituted by a projection o~ a ring 55, which is plvotably Journalled around a hollow cylindrical projection 56 on the klock 2B and which is ooaxial uith the spindle 27. This ring 55 -~ 30 furthermore comprises a second projection in -the form o~ an arm 57 with a fork-shaped end 58~ which includes a bar 59 which at both ends is pivotabl~ journalled to APIIN.8294 7~ 16--12-1976 the spindle 27 by meàns o* connecting port:ions 60 and 61 on the spindle 27, whilst furthermore a handle 62 is connected to the portion 60. In this way, by tilting the handle 62 and thus the bar 59, the arm 57 and the ring 55 as well as the arm 54 and the permanent magnet 53 is pi~otable in any arbitrary position of the bloclc 28;
so that the permanent magnet can be made to engage either with the projection 29 of the ma~k:ing elemen-t 23 or the projection 31 of the marking element 24. A stop means 63 which co-operates with the bar 5.9, as is sho~ in Figs. 1 and 2, defines a rest position of the actuation device ~or the permanent magnet, in which position this magnet is kept remote from the two projections 29 and 31 of the two marking elements When the apparatus is put into operation the ; base 14 is in its rest position7 in which position the scanning elements 129 13 disposed on it are wi~hdra~n from the recess 2, the block 28 with the marking elements 23 and 24 then also being in the rest position, in which said block~ as stated~ engages with the stop 44, In this rest position of the block 28 the two marking elements, : as shown in Fig, 1~ are disposed beside the recess 2, so that a cassette 4 ~can be placed into the said recess - unimpeded. Subsequently, the base 14 is moved into the operating position, the scanning elements 12, 13 then penetrating the cassette and engaging with the magnetic tape. Simultaneously with this mo~ement o~ the base 14 the block 28 is mo~ed so far in the direction of the arrow 64 via the ramp 45 formed on the projection 46 .
of said base,which ramp then engages with said block~
that the blook comes clear of the rampt after which~
: as the ba~e 14 mo~es on~ the connection between the .
1~-12~1976 threadecl spindle 39 and the threaded porti.on 38 of the block 28 is established. In this position o~ the block 28, indicated by the dotted lines 65 in Fig. 1~ the marking elements 23, 24 have assumed their initial posi-- 5 tion above the marking carrier 19. T~en the drive means for the transport Or the magnetl.c tape from the hub 7 to the hub 8 is now s~itched on, steps having been taken to ensure that, if necessary the tape is automatically wound completely OlltO the winding hub r7~ tha block 28 with the marking elements 239 24 synchronously follows the movement o~ the magnetic tape by means of the threaded spindle 39 which is then also dri~en, the *ree ends 36, 37 of the marking elements then covering the ; marking zones 25, 26 on the marking carrier.
If a specific point of the magne-tic tape in respect of its position relative to the sc~nning element is to be identified by means on a mark in the marking zone 25 or 26, the lever 62 is pivoted so that the per-manent magnet 53 is moved against the projection 29 of the marking element 23 or the projection 31 of the - marking element 24. As a result, the rele~ant marking element is magnetized so that t~e magnetic field ~hich emanates from the ~ree end 36 or 37 respecti~ely passes through the marking carrier substantially at right angles to the plane of the said carrier~ the magnetically orientatable particles o~ this carrier in the underlying area of the marking carrier being influenced in such a way that they are re-oriented compared with their ori-ginal orientation, so that at this point an optically visible mark is obtained and is recorded. Thus, such a mark can be made without mechanically loading any com-: ponent~ neither the marking elements nor the marking .
~ -12 , ~ APHN 8294 carrier~ L~y si.mply pi.voting a permanen-t m~gnet.
~ s the magn~tic orient~tion o~ the particles of themarking carrier is re~ersible, such marks can also be erased, which is ef:~ected with the aid o~ a magnetic field~ which then extends substantiall~ in the plane o~
themarking carrier. In the simplest case marks can be erased ~ith the aid of an axiallymagnetized rod magnQt~
which is mamlall~ passed over the marking carrier with the circum~erential sur~ace transverse thereto. Thus, - 10 such a marking carrier is re-usable 9 which is an essen-tial ad~antage~ because it is no longer nccessary to have a large number o~ interchangeable marking carriers at one's disposal ~or such an apparatus. Another impor-tant advantage is .~urthermore that those who have to transcribe a dictation from such a cassette can directly read the marks from the cassette, which marks denote .~or example the beginning and end o~ a dictation, or special nstructions relating to inserts in the dictation etc.
In th~ second embodiment of E`ig~ 3 the marking carriers 19, 20 which contain the mag~etically orientatable particles are each inserted in a compart-. ment 66~ 67 ~ormed in the walls 17 and 18 of the cas-sette 40 In the present case the two compartments each have a window 68 and 69 respectively for opticall~ read-ing the marking carrier. In the case that the compa~t-ments are made o~ a transparent material~ such windows may be dispensed with.
The marking device again comprises a block 28 which is movable along a stationar~ spindle 27 and which co-operates with a threaded spindle 39 with a semi-circular threaded portion 38, ~Jhich spindle is dri~en in synchronism with the transport o~ the magnetic tape.
'' . .
-: ~13--- - . . .
t~ AP~IN,8291~
A U-shaped bracket 71, whose leg 70 is parallel to the spindle 27, is pivotable in the apparatus and a spring 72 loads the part 70 of the bracket, which part runs in a groove 73 of the block 28, in such a way that a COll-nection between the threaded portion 38 and the threadedspindle 39 is guarante~d. As marking ~lement a hook-shaped pin 74 of a so~t magnetic material is mounted in the block 28, whose ~ree end 75 e~tends over the marking carrier 19 on the cassette 4, With an actuating element 76~ which acts on the bracket 71 via a rod 77 this bracket is pivotable against the action of the spring 72; the block 28 -then also being pivoted about the spindle 27 and the marking elemen-t 74 thus being moved beyond the range of the cassette, as is indicated by the dotted lines 78 in Fig. 3. Thus, the marking ele-ment 74 does not impede the insertion or removalvof a cassette into or from the apparatus.
The magnetizing device 22 for the marking element 74 is constituted by a coil 79 provided on the element, which via two slip contacts 80~ 81 makes elcc-trical contact with two contact tracks 82~ 83 provided in the apparatus, The two contact tracks are connected to anenergizing circuit 84, whioh includes a switch 85 which can be closed upon actuation o~ an actuation ele-ment 86~ When the switch 85 is closed current will flo~through the coil 79, independentl~ of the instantaneous posltion of the block 289 so that the magnetic field produced by the coil is passed from the marking element 74 *o the marking carrier 19 and passes through the plane .
o~ said carrier substantially at right angles thereto~
which at the location of the marking carrier results in - a re-orientation o~ the magnetically orientatable particles, ` ' . `
~ r~ ~ IIN 8~94 so that ~gain an opticàll~ visible mark is obtained and is recorded.
The apparatus of Fig. 3 is provided with an erase device 87 for the marking carrier.For this purpose an axially magnetized rod magnet `89 whose axis is substantiall~ parallel to the housing sur~ace is fitted in a recess 88 ~ormed in the housing I of the apparatus, for example in that said rod in the recess 88 is embedded in a plastic 90 Thus~; the magnet pro-duces a magnetic field 9I which extends outside theapparatus, which field may be used as an erase field for the marking carriers on the cassette. For erasure a cassetta with marking carriers is passed through the erase field by hand, in such a way that this field passes through the plane of the marking carriers, For defining the relevant paths to be followed by the mark-ing carriers ~n conjunction with the cassette during passage through the alternating field, a guide track for a cassette is provided on the housing I above the per-manent magnet 89, which track consists of a channel 92which is adapted to the cross-section of the cassette, along whlch channel a cassette can be moved by hand in the dlrection of the arrow 93, Thus~ the position of the marking carriers 19 and 20 relative to the erase field 91 is accurately defined, so that perfect erasure .: .
is guaranteed. A cassette may also be moved automatically along such a guide track.
In the embodiment of Fig. 4 the marking carrier 19 which contains the magneticall~ orientatable .
- 30 particles is mounted on a narrow side wall 94 of the cassette 4~ preferably on that wall which faces the narrow side 9 through which the scanning elements ~ r the ' '- ' ' ~PIIN.8294 ~ 12-1976 magnetic t~pe cnter.`:[n this c~se the cassette 4 is placed in a sha~t-shaped cassette conlainer 959 which is pivoted to the apparat~s~ whos~ wall 96 which extends parallel to the marking carrier 19 has an opening 97 for the pas-sage of the two free ends of the two marking elemen-ts Z3, 24. The two marking elements each act on one half of the marking carrier, so that when the caæsette is turned over9 they cover the other half of the marking carrier.
In order to make the marking carrier visible to the user o~ the apparatus, the housing I has an opening 98 below which a mirror 99 is sui-tably arranged. If d~sired, an illuminating device may be providedO
In this apparatus the erasing device 87 comprises a flat coil 100 which can be energized electrically so as to produce the magnetic alternating field through which a cassette can be passed together with the marking carrier, for which purpose again a guide track is provided which in this case takes the ~orm of a shaft 101 which is adapted to the cross-section o~ the cassette, which has an entrance opening 102 and an exit opening l03~ and which extends through the ~lat coil 100. For erasing a marking carrier the relevant cassette is moved in the direction o~ the arrow 104 into the entrance opening 102, after which the cassette falls through the shaftand remains at the bottom 105 thereof in front of the exit 103~ from which the cassette can be removed by hand. The marking carrier has then passed through the erase field in such a way that the erase field passes through the carrier in the plane of the carrier, so that the marks recorded on the marking .
carrier are erased.
In an embodiment o~ a cassette shown in ~ -- ; . ,~ ,..... . . ..
f~ Ap~IN.82gll Fig, 5 a marking carrier is secured to each of the two ~alls whlch constitute the major sur~aces with the aid of a U-shaped cliplO6 of a transparent material which partly covers the two walls. In ~ig. 5 the wall 17 and the marking carrier l9 are then visible~ For fitting the clip onto the cassette a snap connection is provided which consists of a projection 108 ~ormed at the base 107 o~
the U-shaped clip, which projection en~ages with a recess 109 ~hich is ~ormed in a narrow side wall 94 o~ the cas-sette, This enables the marking carrier to be exchangedin a simple way, the sida walls o~ the clip also ~orming a protect:ion ~or the marking carrier. Such a cassette together with the marking carrier can also be passed through an erase device. However~ it is alternatively ; 15 possible to pass only the marking carriers through an erase de~ice, Furthermore, it ~s possible in the case o~ a cassette which is located in the apparatus in the operating position, to erase the mar~ing carriers on this cassette with the aid of an erase device which is movably disposed~on the apparatus.
In the embodiment o~ Fig. 6 the marking carrier 19 with the magnetically orientatable particles is secured to a bracket 110 of a non~magnetizable ma-terial which is mounted on the apparatus, which bracket is situated underneath a window 111 formed i~ the appa-- ratus housing 1. Associated with the marking carrier is a marking element 23 which is movable in synchronism with the relative movement between the magnetic tape and the scanning elements, which marking element can be magneti~ed ~or the purpose o~ ma~ing in a manner not shown.
` For erasing marks a movable erase device 112 :. . .
, . . , , -. . .. . . .
~ t~. 16 12-1976 is prov:ided, whi ch C omprises a ~lat coil -113, which can.
be energizcd electrically and ~hich extends around the bracket 110~ and a U-shaped permanent magnet 114, which extends around the coil, which -two parts 113, 114 are mounted or a base 115. Said base 115 comprises a handle 116 which projects through a slot 117 which is formed in the apparatus housing and which extends parallel to the bracket 1l0. Bymoving the handl.e 116 along the slot 117 the erase device can be moved over the marking carrier and underneath the marking element 23, Thus, the marking carrier is ~ery ef~ectively erased by two mutually per-pendicular magnetic fields which extend in the plane o~
the marking carrier9 namely by the ~ield of the flat coil and by that of the permanent magnet, through a corresponding reorientation o~ the magnetic particles.
Further modi~ications to the embodimerts described hereinbefore are possible within the scope of the in~ention. In this respect it is to be noted that the marking carrier may-also ha~e a shape other -than that of a strip, for example a rourd shape with concen~
~: tric marking zones.
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Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A magnetic tape cassette recording system, comprising (a) a tape cassette comprising at least one wall having an exterior surface; a planar marking strip affixed to said exterior surface, said strip having at least one marking zone containing magnetically alignable particles which store visually discernible marks in response to application of a magnetic field perpendicular to said strip, said marks being magnetically erasable by application of a magnetic field parallel to the plane of the strip; at least one hub rotatably mounted in said cassette; and a length of magnetic tape wound on said hub, and (b) a tape recorder comprising a housing having a recessed portion in which said cassette is placed, so arranged that said strip is visible; a magnetic head; means for driving said tape past said head for recording or playing back information on the tape; a marking element made of a soft magnetic material and having a free end arranged to be visible; means for moving said marking element in a given direction along the marking zone in synchronization with movement of a tape past the head, said free end oriented perpendicular to said strip; means for selectively magnetizing said marking element; and means for selectively applying a magnetic field parallel to the plane of the strip of a cassette of the type described in paragraph (a).
2. A system as claimed in claim 1 wherein said strip has two marking zones; the recorder has two marking elements each having a free end; the means for moving moves the two elements in synchronization with their free ends aligned along respective zones of the strip; and the means for selective-ly magnetizing includes a permanent magnet and means for moving the permanent magnet from a rest position toward a selected one of said elements.
3. A system as claimed in claim 2 wherein said means for moving the permanent magnet includes means for pivoting said magnet about an axis parallel to said given direction.
4. A system as claimed in claim 1 wherein said strip has two zones, the recorder has two marking elements and two magnetic coils, each coil mounted on a respective marking element; the means for moving moves the two elements in synchronization with their free ends aligned along respective zones of the strip; and the means for selectively magnetizing includes means for electrically energizing a selected one of said coils.
5. A system as claimed in claim 1 wherein said means for selectively applying comprises an erasing magnet, means for mounting the erasing magnet to the housing in a fixed position, and a guide track for guiding a cassette for movement past the erasing magnet in a direction parallel to the strip.
6. A magnetic tape cassette recording system, comprising (a) a tape cassette comprising at least one wall having an exterior surface; a planar marking strip elongated in a longitudinal direction, affixed to said ex-terior surface, said strip having two marking zones extending beside each other in said longitudinal direction, containing magnetically alignable particles which store visually discernible marks in response to application of a magnetic field perpendicular to said strip, said marks being magnetic-ally erasable by application of a magnetic field parallel to the plane of the strip; at least one hub rotatably mounted in said cassette for rotation about an axis perpendicular to said surface; and a length of magnetic tape wound on said hub, and (b) a tape recorder including a housing, means for holding the cassette in an operative position with respect to said housing;
a magnetic heads means for driving said tape past said head for recording or playing back information on the tape; two marking elements each made of a soft magnetic material and having a free end and a magnetizing end; means for mounting said elements with their free ends perpendicular to and spaced a given distance from said strip, said free ends being aligned with respect to each other along a line transverse to said longitudinal direction, means for moving said marking elements in a given direction along the marking zone in synchronization with movement of the tape past the head, while maintaining the alignment and spacing of the free ends; and means for selectively magnetizing a selected one of said marking elements.
a magnetic heads means for driving said tape past said head for recording or playing back information on the tape; two marking elements each made of a soft magnetic material and having a free end and a magnetizing end; means for mounting said elements with their free ends perpendicular to and spaced a given distance from said strip, said free ends being aligned with respect to each other along a line transverse to said longitudinal direction, means for moving said marking elements in a given direction along the marking zone in synchronization with movement of the tape past the head, while maintaining the alignment and spacing of the free ends; and means for selectively magnetizing a selected one of said marking elements.
7. A system as claimed in claim 6, wherein said means for selectively magnetizing includes a single magnet, and means for mounting said magnet for pivotal movement from a rest position toward a selected magnetizing end about an axis parallel to said direction; and said means for moving moves the magnet in the given direction synchronously with said elements.
8. A system as claimed in claim 7 wherein said means for holding includes a recess for the cassette arranged so that the strip is visible to a person transcribing information recorded on the tape; and the recorder includes means for erasing marks on the zones of a strip of a cassette of the type described in paragraph (a), said means for erasing comprising an erasing magnet producing a magnetic field in a given direction and guide means for guiding relative movement between the erasing magnet field and a cassette of the type described in paragraph (a) such that the direction of relative movement and the erasing field given direction are each parallel to the plane of the marking strip.
9. A system as claimed in claim 8 wherein the erasing magnet is mounted to the housing in a fixed position, and the guide means includes a track fixed to the housing.
10. A system as claimed in claim 9 wherein said guide track is formed by a drop shaft having an entrance opening and an exit opening.
11. A system as claimed in claim 8 wherein the means for erasing com-prise two magnets producing mutually perpendicular magnetic fields each parallel to the plane of the marking strip.
12. A system as claimed in claim 8 wherein said strip has a scale parallel to and between said zones indicative of the amount of tape contained on said hub, and said free end of at least one marking element is arranged to be visible to a person transcribing information recorded on the tape.
13. A cassette for magnetic tape comprising a housing having at least one wall having an exterior surface; a planar marking strip affixed to said exterior surface, said strip having at least one marking zone containing magnetically alignable particles which store visually discernible marks in response to application of a magnetic field perpendicular to said strip, said marks being magnetically erasable by application of a magnetic field parallel to the plane of the strip; at least one hub rotatably mounted in said cassette; and a length of magnetic tape wound on said hub.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT24976A AT343928B (en) | 1976-01-15 | 1976-01-15 | RECORDING AND OR REPRODUCTION DEVICE AND CASSETTE FOR A RECORDING CARRIER FOR SUCH A DEVICE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1072672A true CA1072672A (en) | 1980-02-26 |
Family
ID=3485515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA269,555A Expired CA1072672A (en) | 1976-01-15 | 1977-01-12 | Magnetic position marker for a tape recorder |
Country Status (14)
| Country | Link |
|---|---|
| JP (3) | JPS5858748B2 (en) |
| AT (1) | AT343928B (en) |
| AU (1) | AU508083B2 (en) |
| BE (1) | BE850346A (en) |
| CA (1) | CA1072672A (en) |
| CH (1) | CH613296A5 (en) |
| DE (1) | DE2700142B2 (en) |
| ES (2) | ES454999A1 (en) |
| FR (1) | FR2338545A1 (en) |
| GB (1) | GB1568841A (en) |
| IT (1) | IT1076503B (en) |
| NL (1) | NL169529C (en) |
| NZ (1) | NZ183058A (en) |
| ZA (1) | ZA767681B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57100666A (en) * | 1980-12-15 | 1982-06-22 | Mitsubishi Electric Corp | Magnetic recorder and reproducer |
| JPS60775U (en) * | 1983-06-15 | 1985-01-07 | ティーディーケイ株式会社 | magnetic tape cassette |
| JP2008154543A (en) * | 2006-12-26 | 2008-07-10 | Cosmo Seiki Inc | Fishing bait container |
| JP2011103803A (en) * | 2009-11-17 | 2011-06-02 | Kaneshiro Trading Co Ltd | Dried solid ground bait for fishing |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2815216A (en) * | 1954-02-25 | 1957-12-03 | Grundig Max | Sound recording apparatus |
| US3705699A (en) * | 1969-02-07 | 1972-12-12 | Grundig Emv | Tape recorder and cassette for magnetic tape |
| US3683382A (en) * | 1969-05-29 | 1972-08-08 | Honeywell Inc | Recording medium responsive to force fields and apparatus for recording and reproducing signals on the medium |
| BE757760A (en) * | 1969-10-22 | 1971-04-01 | Scanfax Systems Corp | MAGNETIC TAPE ERASER DEVICE |
| GB1384888A (en) * | 1971-10-04 | 1975-02-26 | Clarke Smith Ind Ltd | Tape machine |
| AT325321B (en) * | 1972-03-23 | 1975-10-10 | Philips Nv | MARKING DEVICE FOR A RECORDING AND / OR PLAYBACK DEVICE |
| JPS4911933U (en) * | 1972-05-09 | 1974-01-31 | ||
| JPS5320094B2 (en) * | 1972-07-11 | 1978-06-24 | ||
| JPS5434521B2 (en) * | 1973-11-30 | 1979-10-27 | ||
| DE2520581C3 (en) * | 1975-05-09 | 1980-09-04 | Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen | Arrangement for erasable recording of measured quantities |
-
1976
- 1976-01-15 AT AT24976A patent/AT343928B/en not_active IP Right Cessation
- 1976-12-29 ZA ZA00767681A patent/ZA767681B/en unknown
-
1977
- 1977-01-04 DE DE2700142A patent/DE2700142B2/en active Granted
- 1977-01-12 GB GB1126/77A patent/GB1568841A/en not_active Expired
- 1977-01-12 NZ NZ183058A patent/NZ183058A/en unknown
- 1977-01-12 IT IT19223/77A patent/IT1076503B/en active
- 1977-01-12 JP JP52001592A patent/JPS5858748B2/en not_active Expired
- 1977-01-12 CH CH37077A patent/CH613296A5/en not_active IP Right Cessation
- 1977-01-12 CA CA269,555A patent/CA1072672A/en not_active Expired
- 1977-01-13 AU AU21287/77A patent/AU508083B2/en not_active Expired
- 1977-01-13 ES ES454999A patent/ES454999A1/en not_active Expired
- 1977-01-13 BE BE174049A patent/BE850346A/en not_active IP Right Cessation
- 1977-01-14 FR FR7700982A patent/FR2338545A1/en active Granted
- 1977-01-19 NL NLAANVRAGE7700505,A patent/NL169529C/en not_active IP Right Cessation
- 1977-08-01 ES ES461226A patent/ES461226A1/en not_active Expired
-
1983
- 1983-04-26 JP JP58072342A patent/JPS58218086A/en active Pending
-
1990
- 1990-06-25 JP JP1990066105U patent/JPH0310386U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2700142B2 (en) | 1978-11-30 |
| AU2128777A (en) | 1978-07-20 |
| ES461226A1 (en) | 1978-04-16 |
| IT1076503B (en) | 1985-04-27 |
| DE2700142A1 (en) | 1977-07-21 |
| ATA24976A (en) | 1977-10-15 |
| BE850346A (en) | 1977-07-13 |
| ZA767681B (en) | 1978-08-30 |
| FR2338545B1 (en) | 1983-01-28 |
| JPS52109919A (en) | 1977-09-14 |
| GB1568841A (en) | 1980-06-04 |
| CH613296A5 (en) | 1979-09-14 |
| ES454999A1 (en) | 1978-01-16 |
| JPH0310386U (en) | 1991-01-31 |
| JPS58218086A (en) | 1983-12-19 |
| NL7700505A (en) | 1977-07-19 |
| JPS5858748B2 (en) | 1983-12-27 |
| NZ183058A (en) | 1980-05-08 |
| NL169529C (en) | 1982-07-16 |
| FR2338545A1 (en) | 1977-08-12 |
| DE2700142C3 (en) | 1979-07-26 |
| AT343928B (en) | 1978-06-26 |
| AU508083B2 (en) | 1980-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |