JPH048490Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for detecting the front and back sides of a cassette tape in a cassette tape recorder equipped with a movable holder for loading a cassette tape.

Conventionally, as a cassette tape front/back detection device for detecting the front/back sides of a loaded cassette tape, a device as shown in FIGS. 1 and 2, for example, has been proposed.

This front/back detection device has a protrusion 2 that can fit into a recess 1b, which is a front/back indicator member, provided on one side of a cassette half 1a forming a housing of the cassette tape 1.
The leaf switches 2 and 3, which are the front and back detection means, are made up of movable contact pieces 2b and 3b and fixed contact pieces 2c and 3c, each of which has the movable contact pieces 2b and 3a fixed to their tips, and are installed at predetermined positions on the cassette tape recorder main body 4. The front and back sides (A side, B side) of the cassette tape 1 are detected based on the open/closed states of the tapes 2 and 3 to determine the display or the operating state of the running system and electrical system.

In Figure 1, 5 is a head stand, 6 is a pinch roller, 7 is an erasing head, 8 is a recording/playback head,
9 is a rotating shaft for winding and unwinding the tape.

Such a conventional cassette tape front/back detection device detects the front/back sides of a cassette tape when it is completely loaded into the running system of the tape recorder body. In the case of a tape recorder having a movable holder (cassette list) for loading the tape, it has been impossible to detect the tape just by inserting the cassette tape therein.

Therefore, if you accidentally insert the movable holder so that the side of the cassette tape that is opposite to the one you wish to play is played, the incorrect loading will become apparent only when the movable holder is placed in the cassette tape loading position. After returning the movable holder to the cassette tape loading position and reinserting the cassette tape, the movable holder must be moved to the cassette tape loading position, which is inconvenient in terms of operability.

This idea was made in view of the above points, and it is possible to detect the front and back sides of a cassette tape quickly and with high reliability in a cassette tape recorder equipped with a movable holder for loading cassette tapes, and to quickly and reliably detect the front and back sides of the cassette tape. It is an object of the present invention to improve operability and to quickly and reliably determine the operating state at the time of startup when applied to an auto-reverse type cassette tape recorder.

Therefore, the cassette tape front/back detection device in the cassette tape recorder according to this invention is
A movable holder for loading a cassette tape is provided with front/back detection means for detecting the front/back indicator members provided on the cassette tape, and a cassette tape insertion completion detection means for detecting that the cassette tape is completely inserted into the movable holder. By providing
The front and back sides of the cassette tape can be detected when the cassette tape is completely inserted into the movable holder.

Hereinafter, embodiments of this invention will be described with reference to FIG. 3 and subsequent figures of the accompanying drawings. Note that parts corresponding to those in FIGS. 1 and 2 are given the same reference numerals.

3 and 4 are a side view of a main part and a plane cross-sectional view taken along the - line of the first embodiment of the invention.

In both figures, a movable holder 10 for loading a cassette tape is rotatably attached to the cassette tape recorder main body 4 by shafts 11 at both ends thereof.

This movable holder 10 has an outer guide 10a and an inner guide 10b, which also serve as the outer cover of the cassette tape loading section of a cassette tape recorder, and has notches 10c and 10 on both sides for lateral guidance of the cassette tape.
d, and the notches 10c, 10d
A communication hole 1 is provided between the cassette tape insertion part 10e and the
0f and 10g are drilled.

Then, the notch 10c of this movable holder 10,
On the vertical wall 10d, protrusions 2a and 3a which can be fitted into the recess 1b, which is a front and back marking member provided on one side of the cassette half 1a of the cassette tape 1, through the communication holes 10f and 10g are fixed at the tips, respectively. The bases of leaf switches 2 and 3, which are front and back detection means consisting of movable contact pieces 2b and 3b and fixed contact pieces 2c and 3c, are fixed.

These leaf switches 2 and 3 have protrusions 2a and 3a.
When it is fitted into the recess 1b of the cassette half 1a, the movable contact pieces 2b, 3b and the fixed contact pieces 2c, 3c are brought into a closed (ON) state where they are electrically connected, and the protrusions 2a,
3a does not fit into the recess 1b, the movable contact piece 2
b, 3b are elastically displaced and separated from the fixed contact pieces 2c, 3c to be in an open (off) state.

It is preferable that the leaf switches 2 and 3 are configured so that when the cassette tape 1 is inserted, the protrusions a and 3a are retracted from the cassette tape mounting portion 10e by a retracting mechanism (not shown).

Then, cassette half 1 of cassette tape 1
The base of the leaf switch 12, which is a cassette tape installation completion detecting means, is made up of a movable contact piece 12b and a fixed contact piece 12c, each of which has a protrusion 12a fixed to its tip that can come into contact with the insertion side tip surface of the leaf switch 12. It is fixed to the back wall on the side.

This leaf switch 12 is connected to the cassette tape 1
is the cassette tape insertion part 10e of the movable holder 10.
When the cassette half 1a is fully inserted into the
The protrusion 12a is pushed by the tip surface of the movable contact piece 12b.
is elastically displaced and separated from the fixed contact piece 12c, and becomes in an open (off) state.

FIG. 5 is a block circuit diagram of this embodiment. In the figure, the front/back detection circuits 15, 16 and the cassette tape insertion completion detection circuit 17 output front/back detection signals when the leaf switches 2, 3 are in the on state and when the leaf switch 12 is in the off state, respectively.
S _A , S _B , insertion completion signal S _C control circuit 1
Output to 8.

This control circuit 18 detects whether or not the cassette tape is inserted based on the front and back detection signals S _A and S _B from the front and back detection circuits 15 and 16 when the insertion completion signal S _C from the cassette tape insertion completion detection circuit 17 is input. The front and back sides of the cassette tape 1 are discriminated, and various loads and display devices are controlled based on the result of this discrimination and command signals from the operation key group 19 for specifying the operation of the cassette tape recorder.

In this embodiment, since the cassette tape front/back detection device is configured as described above, the cassette tape 1 is completely inserted into the cassette tape insertion portion 10e of the movable holder 10 in the state shown in FIGS. 3 and 4, for example. When the leaf switch 12 is inserted into the cassette tape 1a, the leaf switch 12 is turned off and the insertion completion detection circuit 17 outputs the insertion completion signal _SC . 1
When the cassette half 1a contacts the protrusion 3a of the leaf switch 3, the recess 1b is not provided in the side of the cassette half 1a, so the leaf switch 3 is turned off.

As a result, the front/back detection circuit 15 outputs the front/back detection signal S _A , and the front/back detection circuit 16 does not output the front/back detection signal S _B , so that the control circuit 18 can distinguish between the front and back sides of the cassette tape 1 and the cassette. Display, tape running direction, electrical circuit switching, etc. are performed according to the insertion state of the tape 1.

Furthermore, when the cassette tape 1 is inserted into the movable holder 10 in the reversed state from the state shown in FIGS. 3 and 4, the protrusion 3a of the leaf switch 3 fits into the recess 1b and turns on, and the leaf switch is turned on. 2 is in the off state, the front/back detection circuit 16 outputs the front/back detection signal S _B , and the front/back detection circuit 15
The front/back detection signal S _A is not output from the front/back side detection signal S A.

In this way, when the cassette tape 1 is completely inserted into the movable holder 10, the front and back sides of the cassette tape 1 can be detected.

This eliminates false detection during the process of inserting the cassette tape 1 into the cassette tape insertion portion 10e of the movable holder 10, simplifies the configuration of the front/back detection circuit, and improves the reliability of the front/back detection results.

Note that if the cassette tape does not have a concave portion serving as a front/back indicator member, the leaf switches 2 and 3 are both turned off and the front/back detection circuits 15 and 1 are turned off.
Since front/back detection signals S _A and S _B are not output from 6,
The control circuit 18 can determine that the inserted cassette tape is a cassette tape that does not have front and back marking members.

FIG. 6 is a side cross-sectional view of a main part showing a second embodiment of this invention.

In this embodiment, the cassette tape 20 of the Philips standard has a hole 20 for burying the head of the cassette half tightening screw 21 of considerable depth in the longitudinal center of one side of the cassette tape 20a near the tape running surface.
b, and the other side does not have this hole 20b, so this hole 20b is used as a front and back marking member.

Therefore, the leaf switches 2 and 3 are attached to the outer guide 10a and inner guide 10b of the movable holder 10, and the protrusions 2a and 3a are connected to the holes in the cassette half 20a.
The hole 20b is provided at a position where it can be inserted into the hole 20b, and the front and back sides of the cassette tape 20 are detected by detecting the presence or absence of the hole 20b.

Further, the leaf switch 12 for detecting the completion of insertion of a cassette tape is provided with a movable contact piece 12b and a fixed contact piece 12c facing in a direction perpendicular to the tape running direction of the cassette tape 1, unlike the previous embodiment.

The other configurations and operations are the same as those of the first embodiment described above, so their explanation will be omitted.

FIG. 7 is a partially sectional side view of a main part showing a third embodiment of this invention.

In this embodiment, this invention is applied to a cassette tape recorder in which a cassette tape 1 is inserted into a movable holder 10 with the tape running surface facing toward you.

The structure and operation of the front/back detection device are substantially the same as those in the first embodiment, so a description thereof will be omitted.

FIGS. 8 and 9 are side sectional views of main parts substantially similar to FIG. 6, respectively, showing other different examples of the cassette tape insertion completion detection means.

FIG. 8 shows how the leaf switch 12 is mounted on the movable holder 1.
The protrusion 12a of the movable contact piece 12b is provided on the outer guide 10a of the cassette tape 1.
It is configured to be pushed by the front end or lower surface of a.

FIG. 9 shows that a pair of light emitting elements 23 and 24 are arranged facing each other on the outer guide 10a and the inner guide 10b at the rear end of the movable holder 10, and when the cassette tape 1 is completely inserted, the light emitting elements 23 and 24 are arranged facing each other. The structure is such that the emitted light is blocked.

With this configuration, the resistance when inserting the cassette tape 1 into the cassette tape insertion portion 10e of the movable holder 10 is extremely reduced.

In each of the above embodiments, the front and back marking members of the cassette tape are recesses provided in the cassette half or holes for cassette half tightening screws,
Although an example has been described in which the front/back detection means is a leaf switch operated by displacement of a protrusion that can be fitted into the recess or hole, the present invention is not limited to this.

For example, the front and back marking members provided on the cassette tape may be a conductive member, a magnetized material, a ferromagnetic material, or a light-reflecting or light-transmitting material. Each of them may be configured by a Hall element, a magnetic head, or a photo sensor.

Furthermore, in each of the above embodiments, an example was shown in which two front and back detection means were provided, but if only a cassette tape provided with front and back marking members is used, it is sufficient to provide one front and back detection means. be.

Further, in the above embodiment, the cassette tape insertion completion detection means is provided in the movable holder, but the purpose can be achieved even if the means is provided on the cassette tape recorder body side as long as the detection end extends into the movable holder. .

As explained above, according to this invention, when the cassette tape is completely inserted into the cassette tape loading movable holder of the cassette tape recorder, the front and back sides of the cassette tape can be detected and displayed with high reliability. The operability of loading a cassette tape is improved.

Further, if applied to an auto-reverse type cassette tape recorder, the operational states of the running system and electrical system can be determined at an early stage, so that the starting operation can be performed quickly and reliably.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional cassette tape front/back detection device, FIG. 2 is a left side view thereof, and FIG. 3 is a side view of essential parts showing a first embodiment of this invention. 4 is a plan sectional view taken along the line - in FIG. 3, FIG. 5 is a block circuit diagram thereof, and FIG. 6 is a side sectional view of main parts showing a second embodiment of the invention. FIG. 7 is a partially sectional side view of the main part showing a third embodiment of the invention, and FIGS. 8 and 9 are FIGS. 6 and 9 showing other different examples of the cassette tape insertion completion detection means. It is a substantially similar main part side sectional view. 1, 20...cassette tape, 1a, 20a...
...Cassette half, 1b ... recess (front and back indicator member), 2, 3 ... leaf switch (front and back detection means), 2a, 3a ... protrusion, 4 ... cassette tape recorder main body, 10 ... movable holder, 12 ... …
Leaf switch (cassette tape insertion completion detection means), 20b... Hole for cassette half tightening screw (front and back indicator member).

Claims (1)

[Scope of utility model registration request] In a cassette tape recorder equipped with a movable holder for loading a cassette tape, the movable holder is provided with front and back detection means for detecting front and back label members provided on the cassette tape, and the cassette tape is completely inserted into the movable holder. A cassette tape insertion completion detection means is provided to detect when the cassette tape is completely inserted into the movable holder, and when the cassette tape is completely inserted into the movable holder, the front and back sides of the cassette tape are detected based on the detection result of the front and back detection means. A device for detecting the front and back sides of a cassette tape.