JPS5858748B2 - Magnetic tape recording/reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing device for magnetic tape, which cooperates with at least one scanning element.

The apparatus comprises a marking device, the marking device comprising at least one marking element for selectively applying marks identifying the position of the marking element relative to the magnetic tape in at least one marking area of the marking carrier. , wherein the element is movable along the marked area in synchronization with relative movement between the magnetic tape and the scanning element.

Such a device is described, for example, in US Pat. No. 2,218,542 and is used in particular for dictation purposes.

In this case, the user of the device can produce an optically visible mark in the form of a perforation slit on a marking carrier, for example paper, with the marking element of the marking device.

However, many other devices with marking devices and marking carriers are known, with which marks can be made in different ways.

The marks are produced by methods such as eg scribing onto the marked carrier, removing a layer of special material from the marked carrier, burning marks onto the marked carrier for temperature recording and the like.

In this connection reference may be made, for example, to US Pat. No. 2,898,112 and published German patent No. 1,224,526.

All of these methods are more or less complex, expensive,
The marking requires a relatively large amount of power and is either indelible or difficult to make on the marked carrier, and therefore it is necessary to supply such devices with large quantities of replaceable marked carriers. be.

The object of the invention is to provide a device of the above type,
This device is particularly advantageous in terms of its construction and ease of operation.

To this end, the invention provides that the marked carrier is a carrier having magnetically orientable particles for storage and optical readout of marks, and that the marking device selectively magnetizes the marked elements made of soft magnetic material. It is characterized by comprising a magnetization device for.

According to the invention, the marked element no longer needs to cooperate mechanically with the marked carrier.

This is important in terms of the overall configuration of the device.

According to the invention, therefore, an optically readable mark is obtained by simple means, the mark can be easily erased, the process on the marked carrier is magnetically reversible, and the user of the water spray device can therefore It is no longer necessary to have large quantities of marked carriers at disposal.

This is because one marked carrier can be magnetically erased and then reused.

A carrier with magnetically orientable particles for the storage and optical readout of information is known per se from US Pat. No. 3,683,382.

The concept underlying the invention lies in the use of said optically readable carrier, which itself is suitable for magnetic tape recording and/or recording.
Or it is known as a reproduction device.

The inventive device comprises a marking device, and the special configuration of the inventive device and the marking device results in the advantages mentioned above and other advantages brought about by the embodiments of the invention described below.

Due to a particularly simple construction, it has been found to be particularly advantageous if the magnetization device is constituted by a permanent magnet which can be pivoted from a rest position toward the marking element.

In the case of a recording-reproducing device having a marking device with two marking elements, each associated with a marking area of a marked carrier, the permanent magnet moves from its rest position towards both the one and the other marking element. It can turn in an effective manner.

Marks can therefore be created simply by rotating the permanent magnet, and no great force is required for this purpose.

A very simple construction is obtained when the magnetization device according to the invention is constructed by a coil mounted on a marked element.

The coil can be electrically energized.

In order to erase marks made on such a marked carrier,
An erasing device is used, which device is described in U.S. Pat.
As described in No. 2, the force string produces a magnetic field that extends substantially in the plane of the marked carrier.

In this regard, a suitable embodiment of the device according to the invention consists of a permanent magnetic and/or electromagnetic erasing device, which is provided in its magnetic field with a guide track for the passage of the marked carrier through the magnetic field.

A marked carrier can be easily erased before it is used, for example by passing it by hand through the magnetic field of an erasing device along the guide track, in which case the guide track is free from the magnetic field. Appropriate locations are limited.

Due to the simplicity of construction, it has been found advantageous if the guide track is constituted by a drop shaft with an inlet opening and an outlet opening.

A magnetic tape cassette for use in a recording-reproducing device according to the invention comprises a carrier in the form of a carrier having magnetically orientable particles for recording and optical reading of marks on at least one wall of the cassette. It is written in such a way that it can be read visually.

Such special marked carriers can simply be glued to other surfaces of the cassette walls.

The cassette and the marked carrier thus form one unit, the two parts of which are handled jointly, and there is no risk of misplacing the marked carrier belonging to a particular cassette or substituting it with another carrier. .

Particularly, when the cassette used in the device of the present invention is used as a dictation cassette, the dictation transfer device on the cassette has marks indicating the beginning and end of dictation, special information, etc. This provides the important advantage of being able to directly read marks on the cassette, such as.

Combining a cassette with a marking body containing magnetically orientable particles also has the advantage that no mechanical forces are applied to the marked carrier and cassette when the mark is made.

Such special marked carriers can be erased, thus ensuring reuse of the marked carrier.

As another example, the marked carrier can be removably arranged in the wall of the cassette, so that it can be easily replaced if it is damaged, for example, during transport of the cassette.

For this purpose, the marked carrier is suitably placed in a compartment provided in the walls of the cassette.

It is also possible to attach the marked carrier to the cassette by means of at least one removable clip which can be fitted onto the cassette.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to examples of the present invention based on the drawings, but the present invention is not limited thereto.

1 and 2, a recording and/or reproducing device, in particular for use as a dictation device, comprises a housing 1 with a recess 2 in which a cassette 4 containing a magnetic tape 3 is placed.

Drive spindles 5, 6 placed in the device cooperate in a customary manner with take-up bubbles 1, 8 in the cassette 4, the magnetic tape being unwound from one take-up bubble onto the other. I can do it.

The magnetic tape 3 then runs along the narrow side of the cassette, which is formed with an opening 10.110, through which the scanning element extends into the device.

These elements are in this case an erasing head 12 and a recording/reproducing head 13, which are adapted to cooperate with the magnetic tape.

The scanning element is mounted on a pedestal 14, which is indicated by the double arrow 1
5 directions within the device.

An actuating device 16 actuated by a control element (not shown) engages the platform 14 so that the scanning element can be retracted from the cassette into a rest position.

In the situation shown in FIG. 1.2, the scanning element is in contact with the magnetic tape, while the magnetic tape has already been transferred from bubble 7 to bubble 8.

The apparatus is equipped with a marking device for the marked carrier in which marks can be made in a selective manner, said marks indicating the relative position of the scanning element with respect to the magnetic tape, so that if the apparatus If used for dictation, it is possible to check the beginning and end of dictation or corrections.

For this purpose, the marked carriers 19, 20 are used as cassettes 4.
0 optically readable on each of the two walls 17, 18, said walls constituting the main surface and said carrier having magnetically orientable particles for storage and optical reading of marks. It consists of

In such carriers, the magnetically orientable particles assume two different orientations depending on whether they are exposed to a magnetic field extending in the plane of the carrier or perpendicular to said plane, so that in one orientation the particles do not absorb the incident light. in the other orientation they diffuse the incident light into the carrier material,
It then absorbs so that the carrier glows at first moment and darkens at the next moment.

In this embodiment, the marked carrier is in the form of strips, which are glued in corresponding recesses formed in the walls 17, 18 of the cassette in positions parallel to the longitudinal direction of the cassette.

At this time, each of the two marked carriers corresponds to the direction of transport of the magnetic tape from one take-up bubble to the other bubble,
Depending on the position in which the cassette is inserted into the device, a marked carrier facing outward from the device and visible to the user is activated.

Since each cassette and the marked carrier are fixed, it is impossible for them to be misplaced or replaced, for example during transportation of the cassettes.

If such special marked carriers are used, the magnetically stored and optically readable marks can be magnetically erased due to the reversible orienting effect of the particles of the carrier, and the marked carrier can be used even if the cassette Even if it is used many times, it can always be reused after being erased, and this point will be explained in detail later.

For marking the associated marked carrier on the cassette, a marking device 21 is provided, which comprises a magnetizing device 22 for two marking elements 23, 24, said pixel elements each marking a mark on the marked carrier. The attached areas 25 and 26 respectively correspond to the magnetic tape 3 and the scanning device 12 that cooperates therewith.
, 13 can be moved along these marked areas in synchronization with the relative movement between them.

For this purpose, the marking device has a stationary spindle 27 along which a block 28 of non-magnetic material, in this case plastic, moves.

This block has two marked elements 23 of soft magnetic material.
and 24 are embedded, and some of them 29, 30 and 31,
32 protrudes from block 28.

Its projections 30 and 32 are guided in slots 33 and 34, which slots are formed in a bulge 35 provided on the housing, said projections having a free end 36 in the form of a curved pin. 37, said end ending just above the marked carrier 19 placed on the cassette 4.

Furthermore, a semicircular threaded portion 38 is formed on the block 28, which cooperates with a threaded spindle 39, said spindle being rotatably journaled in a bearing 40.41 provided on the base 14.

By moving the platform 14 from the working position to the rest position, the scanning device 12, 13 is retracted from the cassette and the connection between the threaded spindle 39 and the block 28 is removed.

In this case, the spring 43 that engages the block 28 is eliminated, in which case the spring 43 that engages the block 28 via the belt 42 is formed on the base 14 and has a projection 46 with a slope 45 that allows the rest position of the block 28 to be removed. After release, the block is moved into a rest position defined by a stop 44 on the housing 1.

In FIG. 1, this rest position is indicated by a dotted line 47.

A disc 48 is mounted on the threaded spindle 39;
This cooperates with a sliding clutch lining 49 provided on the pulley 50 and is freely rotatable on the disc-threaded spindle.

The belt 51 from this pulley 50 is a device part (not shown)
The part rotates during transport of the magnetic tape, for example by a second pulley on the take-up spindle 6.

Thus, the block 28 together with the marked elements 23, 24 is moved along the spindle 27 synchronously with the relative movement between the magnetic tape and the scanning element.

The free ends 36 , 37 of the marked elements move within the corresponding marked areas 25 and 26 of the marked carrier 19 .

A scale 52 printed on the marked carrier allows it to be seen in a manner similar to a counter how much magnetic tape is contained in each of the winding hubs 7 and 8.

The magnetization device 22 includes a bar-shaped axially magnetized permanent magnet 53, which is mounted on an arm 54 constituted by a protrusion of a ring 55.

Said ring is pivotally journalled about a hollow cylindrical projection 56 on block 28 and is coaxial with spindle 27.

This ring 55 further includes a second projection in the form of an arm 57 with a fork-shaped end 58, which is connected to the spindle 27.
It includes a bar 59 rotatably supported on the spindle 27 at both ends by upper connections 60 and 61.

On the other hand, the handle 62 is connected to the portion 61.

Thus, by tilting the handle 62 and therefore the bar 59, the arm 57 and the ring 55 are moved between the arm 54 and the permanent magnet 5.
3 can likewise be rotated to any position on the flock 28, and the permanent magnet can be engaged either with the projection 2.9 of the marked element 23 or with the projection 31 of the marked element 24.

Stop device 63 cooperating with bar 59 as shown in FIGS.
defines a rest position of the actuator of the permanent magnet, in which this magnet is kept at a distance from the projections 29, 31 of the two marked elements.

When the device is put into operation, the platform 14 is in a rest position;
In this position, the scanning device 12.13 arranged thereon is retracted from the recess 2, and the block 28 together with the marking elements 23, 24 is then also in the rest position, where said block is connected to the stop 44 as described above. Multiply.

In the rest position of this block 28, the two marked elements are arranged next to the recess 2, as shown in FIG.
The cassette 4 can therefore be placed in the recess unhindered.

Subsequently, the platform 14 is moved into the working position and the scanning element 12.1
3 will crowd the cassette and engage with the magnetic tape.

Simultaneously with this movement of the platform 14, the block 28 moves in the direction of the arrow 64 via the slope 45 formed on the projection 46 of said platform, said slope then engaging said block,
the block is moved until it leaves the slope;
Then as the metal 14 moves, the threaded spindle 39
A connection is made between the threaded portion 38 of the block 2B and the threaded portion 38 of the block 2B.

At the position of the flock 28, indicated by the dotted line 65 in FIG. 1, the marked elements 23,24 occupy their initial position above the marked carrier 19.

If the drive for the transport of the magnetic tape from the hub 7 to the hub 8 is now switched on, the following effects are ensured: if the tape is automatically completely wound onto the winding hub 7; If necessary, the flock 28, together with the marked elements 23, 24, will follow the movement of the magnetic tape synchronously by means of a threaded spindle 39.

The spindle is then also driven.

As a result, the free end of the marked element moves within the marked area on the marked carrier.

If a particular location on the magnetic tape is to be identified with respect to its position relative to the scanning element by means of a mark in the marking area 25 or 26, the lever 62 is rotated so that the permanent magnet 53 moves into the projection of the marking element 24. 31 or with respect to the protrusion 29 of the marked element 23.

As a result, the marked element is magnetized and the free end 36
or a magnetic field respectively emanating from 3T passes through the marked carrier substantially at right angles to the plane of said carrier, and the magnetically orientable particles of this carrier in the area below the marked carrier are affected. , these are reoriented compared to their original orientation, at which point optically visible marks are obtained and recorded.

Such a mark can be made simply by rotating the permanent magnet, without mechanical loading on any part or on the marked element or on the marked carrier.

Since the magnetic orientation of the particles in the marked carrier is reversible,
Such marks can also be erased, this being achieved by means of a magnetic field extending substantially in the plane of the marked carrier.

In the simplest case, the marks can be erased by means of an axially magnetized bar magnet.

The magnet is passed by hand over the marked carrier so that its peripheral surface crosses the marked carrier.

This marked carrier can thus be reused, which is a major advantage.

This is because it is no longer necessary to have a large number of interchangeable marked carriers at the disposal of such a device.

Another important advantage is that the person who needs to transfer the dictation from the cassette can read the marks directly from the cassette, such as at the beginning and end of the dictation or at the end of the dictation. Represents specific instructions regarding insertion.

In the second embodiment of FIG. 3, marked carriers 19, 20 containing magnetically orientable particles are inserted into compartments made in the walls 11 and 18 of the cassette, respectively.

In this case, the two compartments each have a window 68 and 69 for optically reading the marked carrier, respectively.

If the compartment is made of transparent material, such windows may be omitted.

The marking device includes a block 28 that is movable along a stationary spindle 27 and cooperates with a threaded spindle 39 by means of a semicircular threaded portion 38 .

This spindle is driven in synchronization with the transport of the magnetic tape.

A U-shaped bracket 71, whose legs 70 are parallel to the spindle 27, is rotatable within the device, and a spring 72 loads the legs 70 of the bracket.

This leg runs in a groove 73 in the block 28 in such a way that a threaded portion 38 and a threaded spindle 39
This is how the connection between the two is guaranteed.

A hook-shaped pin 74 of soft magnetic material is provided on the block 28 as a marking element, the free end 75 of which extends over the marking carrier 19 on the cassette 4 .

Actuating element 76 acting on bracket 71 via rod TI
This bracket is then pivotable against the action of spring γ2, and this block 28 is then rotated against the spindle 27.
, and the marked element 74 is moved out of range of the cassette.

This is indicated by dotted line 78 in FIG.

Thus, the marked element 74 does not interfere with the movement of the cassette into and out of the device.

The magnetization device 22 for the marked element T4 is constituted by a coil 79 provided on the element, which has two sliding contacts 80,
81 to make electrical contact with two contact tracks 82 and 83 provided within the device.

The two contact tracks are connected to an activation circuit 84, which includes a switch 85 that can be closed when actuating the actuating element.

When switch 85 closes, current flows through coil 79,
The magnetic field created by the coil is passed from the marked element 74 to the marked carrier 19, substantially perpendicular to the plane of said carrier.

This results in a reorientation of the magnetically orientable particles at the location of the marked carrier, so that again an optically visible mark is obtained and recorded.

The apparatus of FIG. 3 comprises an erasing device 87 for marked carriers.

For this purpose, an axially magnetized bar magnet 89 whose axis is substantially parallel to the housing surface is fitted into a recess 88 formed in the housing 1 of the device, e.g. is buried within the plastic 90.

This magnet thus creates a magnetic field 91 that extends outside the device,
This magnetic field can be used as an erase field for Q) marked carriers on the set.

For erasing, the cassette with the marked carrier is manually passed through an erasing magnetic field in such a way that this field passes through the plane of the marked carrier.

In order to limit the path that the marked carrier with the cassette has to follow during passing through the alternating magnetic field, a guide track for the cassette is provided on the housing 1 above the permanent magnet 89, said track consisting of a groove 92, which is adapted to the cross section of the cassette, along which groove the cassette is moved manually in the direction of arrow 93.

The position of the marked carriers 19 and 20 relative to the erasing magnetic field is thus precisely defined and complete erasure is guaranteed.

The cassette is also automatically moved along such a guiding trajectory.

In the embodiment of FIG. 4, the marked carrier 19 containing magnetically orientable particles is placed on the narrow side wall 94 of the cassette 40, preferably on a narrow side through which a scanning element for a magnetic tape passes. It is installed on the wall soil facing 9.

In this case, the cassette 4 is placed in a shaft-shaped cassette container 95.

Said container is pivoted to the device and its wall 96 extending parallel to the marked carrier 19 has an opening 97 for the passage of the two free ends of the two marked elements 230.

The two marked elements each act on one half of the marked carrier, so that when the cassette is turned over, they will travel over the other half of the marked carrier.

To make the marked carrier visible to the user of the device,
The housing 1 has an opening 98 beneath which a mirror 99 is suitably arranged.

A lighting device can be provided if desired.

In this device, the eraser 87 includes a flat coil 100;
Said coil is electrically energized to produce an alternating magnetic field, through which the cassette passes together with the marked carrier, for which purpose a guide track is provided, this track in the form of a longitudinal hole 101. ing.

This vertical hole is adapted to the cross section of the cassette,
The flat coil 10 has an inlet opening 102 and an outlet opening 103.
Extending through 0.

To erase a marked carrier, the associated cassette is marked with arrow 1.
04 into the inlet opening 102 , the cassette then falls through the well and remains at its bottom 105 in front of the outlet 103 .

From there the cassette can be removed manually.

The marked carrier is then passed through the erasing field in such a way that the erasing field passes through the fingers in the plane of the carrier and the recording on the marked carrier is erased.

In the embodiment of the cassette shown in FIG. 5, the marked carrier is fixed to each of the two walls constituting the main surface with the aid of a U-shaped lip 106 of transparent material partially covering the two walls.

In FIG. 5, the wall 17 and the marked carrier 19 are visible.

In order to fit the clip onto the cassette, a snap connection is provided which consists of a projection 108 formed in the bottom 107 of the U-shaped clip which fits into a recess 109 formed in the narrow side wall 94 of the cassette. Multiply.

This allows the marked carrier to be easily replaced.

The clip sidewalls will also protect the marked carrier.

Such cassettes can also be passed through the erasing device together with the marked carrier.

However, it is also possible to pass only the marked carrier through the erasing device.

Furthermore, in the case of a cassette placed in the device in the working position, the marked carrier on this cassette can be erased by means of an erasing device which is movably arranged in the device.

In the embodiment of FIG. 6, the marked carrier with magnetically orientable particles is affixed to a bracket 10 provided on the device;
The bracket has a window 11 formed in the housing 1 of the device.
It is located below.

Associated with the marked carrier is a marked element 23 movable in synchronization with the relative movement between the magnetic tape and the scanning element.
, and this marked element can be magnetized for symbolizing purposes in a manner not shown.

a movable erasing device 112 for erasing the marks;
It includes a flat coil 113, which is electrically energized and extends around the bracket 110, and a U-shaped permanent magnet 114, which extends around said coil and connects these two parts 113. 114 is provided on a stand 115.

The platform 115 includes a handle 116 that projects through a slot 117 formed in the device housing and extending parallel to the bracket 110.

By moving the handle 116 along the slot 117, the erasing device can be moved over the marked carrier and under the marked element 23.

The marked carrier is thus erased very effectively by two mutually orthogonal magnetic fields extending in the plane of the marking body, namely the field of the flat coil and the field of the permanent magnet, by a corresponding reorientation of the magnetic particles. .

Other variations to the embodiments described above are possible within the scope of the invention.

In this regard, the marking body can also have a shape other than a band shape, for example a round shape with concentric marked areas.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the parts of a recording and/or reproducing device for a magnetic tape housed in a cassette, and shows the device specifically used as a writing device which forms the essence of the invention; FIG. 1 is a cross-sectional view of the apparatus shown in FIG. 5 is a diagram showing an example of a cassette having a magnetic tape suitable for use in the recording/reproducing apparatus of the present invention, and FIG. 6 is a diagram showing another embodiment of the present invention. 1 is a schematic diagram of a reproducing device, with a marked carrier arranged on a stationary part of the device, and including a movable erasing device for the marked carrier; FIG. 1...Housing, 2...Recess, 3.
...Magnetic tape, 4...Cassette, 5,
6...1 drive spindle, γ, 8...
Winding bubble, 10, 11... Opening, 12...
...Erasing head, 13... Recording/reproducing head, 14... Unit, 16...1 actuating device,
19, 20... Marked carrier, 21...
・Marking device, 22...Magnetizing device, 23,2
4...Element with mark, 25°26...
Marked area, 27...Spindle, 28...
... Flock, 30, 32 ... Protrusion, 33
゜34...Slot hole, 39...Spindle, 48...Disc, 53...Permanent magnet, 55...Ring, 59... ...Bar, 6
2...Handle, 68, 69...Window, 71
...U-shaped bracket, 74...Kook-shaped pin, 79...Coil, 80,81...
・Sliding contact, 82° 83...Contact track, 85・
...Switch, 87... Eraser, 88
...Concavity, 89...Bar magnet, 91...
...Magnetic field, 97,98...Aperture, 99...
...Mirror, 100.113...Flat coil, 1
02... Inlet opening, 103... Outlet opening, 106... U-shaped lip, 108...
... Protrusion, 109 ... Recess, 110 ...
... Bracket, 112 ... Eraser, 114
......U-shaped permanent magnet, 115...stand, 1
16...handle, 117...groove.

Claims (1)

Claims: 1. synchronized with the relative movement between the magnetic tape and the scanning element for selectively applying marks confirming the position of the scanning element with respect to the magnetic tape in at least one marked area of the marked carrier; In a recording-playback device for magnetic tape, comprising at least one marking element movable along a marked area, cooperating with at least one scanning element,
The marked carrier is a carrier having magnetically orientable particles for recording and optical reading of marks, and the marking device includes a magnetizing device for selectively magnetizing the marked elements made of soft magnetic material. 1. A magnetic tape recording and reproducing device comprising: 2. Device according to claim 1, characterized in that the magnetization device consists of a permanent magnet which is rotatable from a rest position towards the marked element. 3 each associated with one marked area of the marked carrier.
Claim 2 comprising a marking device comprising two marking elements, the permanent magnet being rotatable from its rest position towards both the one marking element and the other marking element. The device described. 4. Device according to claim 1, characterized in that the magnetization device is constituted by a coil provided on the marked element, said coil being electrically energizable. 5. Device according to claims 1 to 4, characterized in that it comprises a permanent magnetic and/or electromagnetic erasing device, and a guide track for passing the marked carrier through the magnetic field is provided in the magnetic field of the erasing device. 6. Device according to claim 5, characterized in that the guide track is constituted by a drop shaft with an inlet opening and an outlet opening.