DE6911147U - MAGNETIC TAPE CASSETTE - Google Patents

Description

GRUNDIG E.M.V. I7.3.I969 Electro-mechanical research institute

Owner: Max Grundig 782-He / Ku

8510 FUrth / Bavaria, Kurgartenstrasse 37 Reg. 1465

Magnetic tape cassette

The innovation relates to a magnetic tape cassette with a scale for displaying the desired audio track locations and one A device for preventing accidental erasure of recorded tapes, which has a cassette opening that can be closed by a locking bar, such as that, depending on the state of the lock, a subsequent actuation of the record button of the tape recorder by means of to prevent or not prevent such a locking piece that is movably connected to the cassette wall.

It is already a magnetic tape cassette of the above Specified genus has been proposed, which has the advantage that in contrast to previously known Magnetic tape cassettes the lock only by switching the lock piece and not the state of the The closure can be changed by breaking out a locking piece or * gluing in, this already proposed,

- 2nd

- 2 - Reg. 1465

has improved magnetic tape cassette in terms of bringing about the change of the locked state in the case of an inattentive tape recorder user still the lack that if one against erasure itself to be protected the circuit breaker for "recording / recording free ** is accidentally open, the record lock does not take effect.

The inventor has set himself the task of creating the proposed magnetic tape cassette described in more detail at the beginning to make it even more operationally reliable with easier exposure protection switching.

In the case of the tape cassette, this task is the one at the beginning Specified genus according to the invention solved in that an optical warning means is also provided is that depending on the state of the shutter when the shutter is open in a light path or at closed shutter from this light path is controllable.

This design, in which the additional optical warning means, for example, causes the cassette scale, which is lit up in white, to light up red, a significant increase in operational reliability is achieved against inadvertent erasure of valuable recordings in magnetic tape cansettes that are easy to use with the

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- 3 - Reg. 1 ** 65

"Recording protection switch" are provided.

The following is an embodiment of the innovation described on the basis of a figure, which shows, in plan view, the individual essentials in connection with the innovation. shows parts of a magnetic tape cassette and the associated tape recorder fixed parts partially in section.

The magnetic tape cassette 1 in question, which can be plugged into the tape recorder, has a scale k to display desired audio track locations and a device for preventing accidental erasure of recorded magnetic tapes, which has a cassette opening 3 that can be closed by a locking piece 2, such that depending on the state of the closure a subsequent actuation of the record button of the tape recorder by means of the locking stick 2 is to be prevented or not prevented. This locking piece 2 is movable with the cassette wall -Orbunden in such a way that it can be controlled from outside the cassette 1 into the respectively desired position, for example by means of an auxiliary tool (coin).

- k - Reg. 1465

In the magnetic tape cassette 1 _t, which usually has a housing molded from transparent plastic, two winding cores carrying a tape reel are rotatably mounted. The cassette housing has a scale h - but two scales in the case of Yende cassettes. From the axis 5 of the take-up reel 6 a fixed, step-down cable drive 7 runs to a likewise fixed worm spindle 8, which protrudes through an opening in the cassette housing and engages in a worm wheel 9 which sits on one free end of the threaded spindle 10 fixed to the cassette The drive connection is used for the longitudinal displacement of the scale pointer 11, which is seated on the threaded spindle 10, along the parallel to the threaded spindle

IO provided scale k _t the characteristics and /

Plastic » or embossings in the transparent wall of the Cassette 1 is formed The information on the% scale can either refer to minutes of playing time or to meters of tape length

With the slider 13 scanning the locking piece 2 1st »la optical variable in the form of a color filter 14, ζ · Β. Red filter, connected, which depends on the state of the lock and the status of the lock piece 2 open «shutter in a light path or if

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closed on the shutter can be controlled from this light path. The light path leads from the light source 15 through openings 16, 17 in the device chassis 12 and the cassette housing 1 further through a light guide 18 arranged in the cassette housing and consisting of transparent plastic and is indicated by the dashed lines 19. At the point of entry into the cassette and the deflection point in the corner of the cassette, the light guide 18 has prismatic surfaces 2O ₁ 21, which are used to deflect the respective light beam.In the cassette, the light guide 18 runs along the wall of the cassette and parallel to the longitudinally extending scale k . The light guide 18 also serves as a light distribution body and ensures uniform illumination of this scale

As can be seen from the figure, the optical warning means is in the form of, for example, a red filter 14 in the above-described Lichtweg sswischen the cassette 1 and the device-fixed light source 15 controllable, so that in the case of the desired Prevention of the actuation of the record button or the prevention of unintentional deletion of played Tapes in the event of the slide 13 being closed by mistake with its left feeler lever 22

'- 6 - Reg «

through the open closure and is slidable overall so that the red filter is inserted into the above-described light path, so that the white illuminated scale 4 for Warning now lights up red,

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In another implementation, the color filter \ k is ^{only pushed in front of the light source 15 when the record button is pressed, so that the tape recorder user can clearly see the switched-on operating state "recording 11 of} the tape recorder" and in the event of an accidental operation of the record button as well as the regular operation of the record button the possibly undesirable possibility of deleting valuable recordings is made aware.

Claims (3)

• I It t ••> • ι a · »· I · Reg. 1465 • ·» ImmI t7I · tt I I · t • »t ··· * · Protection claims 1. Magnetic tape cassette with a scale to indicate the desired locations in the audio track and a device to prevent accidental erasure of recorded files
Tapes which have a cassette opening that can be closed by a locking piece, in such a way that, depending on the state of the lock, a subsequent actuation of the record button of the magnetic tape device by means of
such a locking piece is to be prevented or not prevented, which is movably connected to the cassette wall, characterized in that an optical Warning means (14) is provided, which depends on the state of the lock (2) when the lock is open in a light path (19) or, when the shutter is closed, this light path can be controlled. 2. Cassette according to claim 1, characterized in that the optical warning means (14), for example a red filter, can be controlled as a function of the closed state by a slide (13) fixed to the device. • 8th - 3. Cassette according to claim 2, characterized in that / optical means (ill) into the light path (I9) between the cassette (i) and a fixed light source (15) is controllable. k. Cassette according to claim 3 * characterized in that provided in the cassette (i) 1 "light path (19), a light guide body (18) let _s 5 · Cassette according to claim h _t characterized in that the cassette-fixed light guide body (18) is designed as a light distribution body and a longitudinally extending scale (i4) is arranged to run parallel to the light guide body 6, cassette according to claim 5 t characterized in that the scale (h) is formed by indentations and / or impressions of a cassette housing part made of a transparent plastic compound.