JPH04168653A - Cassette player - Google Patents

Abstract

PURPOSE:To enable pressing state between a magnetic head and a tape to be stable and achieve an improved recording/reproduction by inserting a head pad lever where a head pad is mounted to from hole part which is continuous to a window part for inserting and extracting the magnetic head. CONSTITUTION:A head pad lever 54 where a head pad is mounted is inserted from holes for capstan 2a, 2b, and 3b or guide holes 5a and 5b. Also, this head pad lever 54 is formed by a material with a magnetic shielding effect. Then, when the magnetic head is inserted into or extracted from the windows for pinch roller 2a and 2b or small windows 3a, 3b, 4a, and 4b, the head pad is inserted from the hole for capstan or the guide holes 5a and 5b accordingly. Thus, even if the magnetic head is inserted from a window other than a window for magnetic head 1, a tape can be pressed by the magnetic head and the head pad at recording or reproduction, thus achieving an improved recording/ reproduction operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cassette tape player for recording and playing back compact cassette tapes.

[Summary of the Invention] The cassette tape player of the present invention has a head unit that allows the magnetic head to contact the magnetic tape through a window other than the magnetic head window of the compact cassette tape, that is, a pinch roller window or a small window. When configuring the compact cassette tape, the head pad lever to which the head pad is attached is inserted through a hole continuous to the window of the compact cassette tape through which the magnetic head is inserted and removed, that is, a cab scan hole or a guide hole. do. Further, the head pad lever is made of a material that has a magnetic shielding effect. With these configurations, the touch between the magnetic head and the tape is improved, and the head pad lever also functions as a shield plate.

[Prior Art] Figure 8 is a perspective view of a compact cassette tape (hereinafter simply referred to as a cassette).As is well known, this cassette has a magnetic head that can be inserted and removed when it is loaded into a cassette player. The magnetic head window 1 is used for magnetic head operations, the pinch roller windows 2a and 2b are used to insert and remove the pinch roller (and erasing head depending on the model), the capstan holes 3a and 3a are used to insert the capstan, and especially the reverse a small window 4a into which the erasing head is inserted and removed in the case of a recording/playback device of the type capable of recording;
4b, and guide holes 5a and 5b into which the guide protrusions are inserted.
are each standardized. Further, a pad 6 is attached inside the magnetic head window 1 so as to be biased in the tape T direction.

Furthermore, as shown in the exploded view of the cassette in FIG. 9, a shield plate 7 is provided on the back surface of the pad 6 inside the magnetic head window 1 to provide a magnetic shielding effect.

The head unit of a cassette player into which such a cassette is installed differs somewhat depending on the model, but is roughly divided into shapes and holes as shown in FIGS. 10(a) to 10(d). In addition, in FIG. 10, 11 is a magnetic head, 1
2 is a pinch roller, 13 is a capstan, 14 is an erasing head, and 15 is a guide protrusion.

In other words, the reproducing head or recording/reproducing head of the head unit is usually inserted through the magnetic head window l of the cassette.
It is positioned so as to come into pressure contact with the tape T using the pad 6.

[Problems to be Solved by the Invention] However, in the case of configuring a head unit having two units of reproducing heads, for example, one or both of the reproducing heads are connected to the pinch roller window 2a.

In some cases, the reproducing head or the recording/reproducing head may be inserted through a window other than the magnetic head window 1, such as when it is necessary to insert the magnetic head through the magnetic head window 2b or the small windows 4a and 4b. be.

However, since the cassette itself does not have pads 6 and shield plates 7 formed on the back side of the windows other than the magnetic head window 1, the magnetic head can be inserted through the window other than the magnetic head window 1 and the tape can be read. Even if the magnetic head is in pressure contact with the tape, the state of pressure contact between the magnetic head and the tape is unstable, causing fluctuations in the playback level, deterioration of azimuth characteristics, increase in wow and flutter, and, of course, the magnetic shielding effect. The problem is that it cannot be obtained.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems. When configuring the device section, a head pad lever to which a head pad is attached is inserted through a hole that is continuous with the window of the cassette through which the magnetic head is inserted and removed, and furthermore, the head pad lever is provided with a magnetic shield. It should also be molded with a material that is effective.

[Function] When the magnetic head is inserted or removed from the pinch roller window or small window, the head pad can be inserted from the capstan hole or guide hole of the cassette accordingly.
Even if the magnetic head is inserted through a window other than the magnetic head window, the tape can be sandwiched between the magnetic head and the herad pad during recording or reproduction. Furthermore, if the head pad lever that holds the head pad is made of a material that has a magnetic shielding effect, the magnetic shielding effect can be obtained even without a shield plate.

[Example 1] Figures 1(a) and 1(b) respectively show the structure of a head unit (in particular, one Based on the so-called single capstan/reverse configuration, which enables not only constant-speed recording and reproducing running in the normal direction but also constant-speed reproducing running in the reverse direction by rotating the capstan in the forward and reverse directions. This figure conceptually shows an embodiment of the present invention.

In the figure, 21N is a magnetic head for normal running (hereinafter referred to as
21R is a magnetic head for reverse running (hereinafter referred to as reverse head), 22 is a pinch roller, 23 is a capstan, 24 is a pad attached to the head device side, 251N and 25R are erasers. The head 26 indicates a guide projection.

Figure 1 (, a) shows an example of a single capstan reverse system for playback only. When a cassette is installed, the capstan 23 is inserted through the guide hole 5b, and the pad 24 is inserted through the capstan hole 3b. inserted.

During playback, the pinch roller 22 is inserted through the small window 4b and the tape T is pressed against the capstan 23 to run at a constant speed, and in the case of normal playback, the normal head 21. N is inserted through the pinch roller window 2b, and the reverse head 21R is inserted through the magnetic head window 1 during reverse playback.

In this case, the normal head 21N has the pinch roller window 2.
Although it is inserted from b, the pinch roller window 2b is inserted at the same time.
Since the pad 24 is inserted through the capstan hole 3b which is continuous with the capstan hole 3b, the tape T is inserted into the normal head 21 during normal playback. It is sandwiched between N and the pad 24, and a reproduction operation is performed with a good head touch.

Next, FIG. 1(b) shows an example of a single capstan reverse system that allows recording and playback.
The N and reverse heads 21R are each used as a recording/reproducing head.

When the cassette is loaded, the capstan 23 is inserted through the guide hole 5a, and the pad 24 is inserted into the capstan hole 3.
It is inserted from a. And the pinch roller 22 is a small window 4a.
Normal head 21N during normal driving (and erase head 25N during recording)
is inserted through the magnetic/rad window 1, and the reverse head 21R (and erasing head 25R during recording) is inserted through the pinch roller window 2a during reverse running.

In this case, the reverse head 21R is connected to the pinch roller window 2.
At the same time, the tape T is inserted through the capstan hole 3a which is continuous with the pinch roller window 2a, so that the tape T is sandwiched between the reverse head 21R and the pad 24 even during reverse running recording and playback. , recording and reproducing operations are performed with good head touch.

The configuration of the head unit that realizes the single capstan reverse method shown in FIGS. 1(a) and 1(b) is as follows: the capstan 23 is connected to the guide hole 5a.

5b, the normal head 21N is closer to the supply reel during normal running than the capstan 23, and the reverse head 21R is closer to the capstan 23.
Capstan 2 is positioned closer to the supply reel during reverse running than Capstan 2.
3 is located closer to the take-up side than the magnetic head, so that tape running is always stable. And furthermore,
When a recording/playback head is inserted through a window other than magnetic head window 1 of the cassette, the pad 24 is inserted correspondingly, and the same conditions as when the recording/playback head is inserted into magnetic head window 1 are inserted. Recording/playback operations are performed.

A specific example corresponding to the conceptual diagram of FIG. 1(a) will be described below.

FIG. 2(a) simply shows the drive transmission system of the cassette tape player of this embodiment, where 30 is a motor unit capable of forward and reverse rotation, 31 is a belt, 32 is a flywheel, and 33 is a It is a bearing, and the capstan 23 is driven at a constant speed in forward and reverse directions using a so-called disk drive method. At this time, the capstan 23 is at a position where it is inserted into one of the guide holes 5b when the cassette shown in FIG. 8 is loaded.

Incidentally, the constituent parts of the capstan 23 and the flywheel 32 are shown in a side sectional view in FIG. 2(b). 32a is a groove portion around which the belt 31 is wound, and 32b is a drive gear attached to the flywheel 32. The capstan 23 is held at the center of the flywheel 32 and the bearing 33, thereby transmitting the rotational force from the motor section 30.

Here, the bearing 33 is formed with a circumferential portion 33b having a diameter that contacts the inner wall portion of the rectangular guide hole 5b at three points following the flange portion 33a.

Further, a stepped portion 33c is provided which contacts the cassette half and is not inserted into the guide hole 5b.

In addition, in FIG. 2(a), 34 is a flywheel 32.
A reduction gear that meshes with the upper drive gear 32b, 35 a letter 1 lever whose rotation axis is the center of the reduction gear 34, 36 a transmission gear during normal running that is pivotally supported by one end 35a of the letter 1 lever 35, Reference numeral 37 designates a transmission gear during reverse running which is pivotally supported by the other end 35b of the 1-shaped lever 35, 38.39 a reel gear, and 40.41 a reel stand. Transmission gear 36.
37, rotational force is transmitted from the reduction gear 34 via the clutch portion 34a.

42 is a normal reverse lever (hereinafter referred to as NR lever), and long holes 42a and 42b have regulating pins 43a,
43b is inserted and supported, allowing sliding movement. Further, a torsion coil spring 44 is attached to the protrusion 42c, and the protrusion 35 of the character 1 lever 35
It is connected to c. Although the slide movement means of the NR lever 42 is not shown, it may be any means as long as it slides in the N direction and the R direction in conjunction with the normal driving operation and the reverse driving operation, and it may be a mechanism such as a cam gear with missing teeth or a plunger. An examiner is appointed.

In addition, 45 is a reduction gear 34 during fast forwarding and rewinding,
In order to connect the reel gear 39 or 38 with the gear 46, this lever is rotated in the direction of arrow FR force by a mechanism not shown.

The state of such a drive transmission system during normal running is shown in FIG. 2(c).

In other words, when the normal driving operation is performed, the NR lever 4
2 is slid to the normal position, and as the NR lever 42 slides, the 1-shaped lever 35, which is connected to the NR lever 42 by a torsion coil spring 44, rotates to the left. Then, the transmission gear 36 contacts and meshes with the reel gear 38. Therefore, the rotational force in the normal direction N from the motor section 30 is transmitted to the flywheel 3 via the belt 31.
2 to drive the capstan 23 in the Nc force direction, and also to drive the capstan 23 in the Nc force direction, and from the drive gear 32b of the flywheel 32 through the reduction gear 34, the clutch portion 34a, the transmission gear 36, and the reel gear 38, to the take-up reel during normal running. A certain reel stand 40 is rotationally driven.

Next, when driving in reverse, the NR lever 42 slides to the reverse position, as shown in FIG. 2(d).
Accordingly, the 1-character lever 35 is rotated to the right. Then, the transmission gear 37 meshes with the reel gear 39. Therefore, the reverse RM rotational force of the motor section 30 drives the flywheel 32 via the belt 31 and drives the capstan 23 in the RC direction, and the drive gear 32b of the flywheel 32, the reduction gear 34, and the clutch section 3.
4a, the transmission gear 37, and the reel gear 39, the reel stand portion 41, which is a take-up reel during reverse running, is rotationally driven.

Next, the configuration of the head device section of this embodiment is shown in FIGS. 3(a) and 3(b).
) will be explained using a plan view and a side view.

The head device section is three-dimensionally constructed relative to the NR lever 42, and 47 is a pressure lever attached to the NR lever 42, which slides together with the NR lever 42.

48N and 48R are head levers that move the normal head 21N and reverse head 21R toward and away from the tape in the cassette, respectively, and head base plates 49N and 49R (
The normal head 21
N. Equipped with reverse head 21R. Both of the head levers 48N and 48R are rotatably supported from the upper substrate 51 by a shaft portion 5o.

A pinch lever 52 is rotatably supported from the upper substrate 51 by a shaft 53, and the pinch roller 22 is pivotally supported at its tip 52a. Further, as can be seen from FIG. 3(b), a protruding pin 52b is provided which reaches from above to the height position of the pressure bonding lever 47. Here, the pinch roller 22 and the tip portion 52a that pivotally supports the pinch roller 22 are sized to be inserted into the small windows 4a and 4b of the cassette.

Note that the head levers 48N, 48R1 and the pinch lever 52 have their respective tip portions urged in the six directions of the arrows with respect to the respective rotating shafts by urging means such as springs or winding springs (not shown).

Reference numeral 54 indicates a pad lever rotatably attached to the chassis. A plan view and a side view of a portion of the bad lever are shown in FIGS. 4(a) and 4(b). This pad lever 5
A protrusion piece 54a that protrudes upward is provided at one end of the head 4, and a pad 24 is attached to the protrusion piece 54a at a position facing the normal head 21N via a tape.

Further, the pad lever 54 is formed of a shielding material such as permalloy, and the protruding piece 54a and the pad 24
The portion is sized and positioned so that it can be inserted into the capstan hole 3b of the cassette to be loaded. Note that this pad lever 54 is also configured such that the protruding piece 54a is urged in the direction of arrow A with respect to the rotating shaft 54b by means of urging means such as a spring SP shown in FIG. 3(a). When the other end 54c comes into contact with the locking body 56,
Rotation of the pad 24 portion in the A direction is restricted.

The head unit is generally configured as described above, and takes three states: normal running, reverse running, and stop (including tape fast forwarding and tape rewinding; the same applies hereinafter).

First, the movement of the pinch roller 22 toward and away from the capstan 23 will be explained with reference to FIGS. 5(a) to 5(c).

The above-mentioned crimp lever 47 has a trapezoidal notch 47a formed therein as seen in FIG. 5, and the pinch lever 52 is biased away from the capstan 23 as described above. Figure 5 (a) when stopping
As shown in FIG. 2, the protruding pin 52b is fitted into the notch 47a, so that the pinch roller 22 and the capstan 23 are separated from each other.

However, during normal driving, as the NR lever 42 slides as described above, the crimp lever 47 attached to it also slides at the same time as shown in FIG. do. Therefore, the pinch lever 52 is pushed out in the opposite biasing direction, and the pinch roller 22 and capstan 23 are brought into pressure contact. At this time, since the capstan 23 is rotating at a constant speed in the NC direction, the tape T is sandwiched between the pinch roller 22 and the capstan 23 and runs at a constant speed in the normal direction.

Also, when driving in reverse, the NR lever 42 is
Similarly, when the crimp lever 47 slides as shown in FIG.
and the capstan 23 are brought into pressure contact. At this time, the capstan 23 is rotating at a constant speed in the RC direction, so that the tape T is sandwiched between the pinch roller 22 and the capstan 23 and runs at a constant speed in the reverse direction.

Next, the contact and separation operations of the normal head 21N and reverse head 21R with respect to the tape T are shown in FIGS. 6(a) to 6(c).
).

As mentioned above, the head levers 48N and 48R are attached to the shaft portion 5.
0 in the anti-capstan direction, and push-out bottles 42d and 4 are placed on the NR lever 42.
2e is formed, so at the time of stop, the condition shown in Fig. 6 (
As shown in a), the pusher pins 42d and 42e are in contact with the tip portions 48Na and 48Ra of the head levers 48N and 48R. In this state, both heads are 21N.

21R is not in contact with the tape T (not shown).

However, during normal running, the push-out pins 42d and 42e also slide as the NR lever 42 slides, so the push-out pin 42d pushes out the helad lever 48N in the direction of the tape T, as shown in FIG. 6(b). Rotate it. Then, the normal head 21N mounted on the head lever 48N is pushed out downward from the tape, while the pushing pin 42e does not act on the reverse head 21R side. The pushed-out normal head 21N presses the pad 24 inserted from the capstan hole 3b through the pinch roller window 2b of the installed cassette with the tape T interposed therebetween. Therefore, the tape T is sandwiched between the normal head 21N and the pad 24, making it possible to reproduce the tape during normal running.

During reverse running, the push-out pins 42d and 42e move as shown in FIG. 6(C) as the NR lever 42 slides, and the head lever 48R is pushed out by the push-out pin 42e, while the normal head 21N side is pushed out. Since the action of the push-out pin 42d is released, the reverse rod 21R comes into pressure contact with the tape T of the loaded cassette, making it possible to perform a reproducing operation during reverse running. At this time, the tape T is sandwiched between the reverse head 21R and the pad 6 installed in the magnetic head window 1 of the cassette.

The positional relationship between the head unit and the mounted cassette in the cassette tape player of this embodiment as described above is shown in FIGS. 7(a) and 7(b) (this is an example during reverse running).

That is, when a cassette is loaded, the capstan 23 is inserted through the guide hole 5b, while a guide protrusion 26 similar to that of a conventional cassette player is fitted into the guide hole 5a. Here, positioning on the guide hole 5b side is achieved by the circumferential portion 33b of the bearing 33 of the capstan 23, which has the same diameter as the guide protrusion 26, coming into contact with the inner wall portion of the guide hole 5b at three points.

Further, the pad 24 attached to the protruding piece 54a of the pad lever 54 is inserted into the capstan hole 3b of the cassette, while the capstan hole 3a is not used.

Further, the reverse head 21R is inserted and removed from the magnetic head window 1, the normal head 21N is inserted and removed from the pinch roller window 2b, the pinch roller 22 is inserted and removed from the small window 4b, and the pinch roller window 2a and the small Window 4a is not used.

In this way, in this embodiment, by inserting the capstan 23 through the guide hole 5b, the heads are arranged on both sides of the capstan 23 so that it functions alternately in normal and reverse modes, and also in normal driving. The reproducing head is always located between the capstan 23 and the reel on the side that feeds out the tape T, not only when running in reverse.

In other words, in this embodiment, since the capstan 23 always acts to pull the heads (normal head 21N, reverse head 21R) that perform playback operation at a constant speed from the take-up reel side, the tape runs normally. The single capstan reverse system, which conventionally had the problem of unstable tape running during reverse, can be configured to be fully practical.

Therefore, it is possible to actually realize the advantages of the single capstan reverse method, such as low cost, reduced power consumption, light weight, and small size, and it is particularly suitable for portable cassette tape players. .

Furthermore, by providing two units of reproducing heads, one of the reproducing heads (normal head 21N) is connected to the pinch roller window 2 where the pad 6 and the shield plate 7 are not provided.
Although it must be inserted from the tape T, since the pad 24 is inserted from the capstan hole 3b at the same time as the cassette is loaded, the normal head 21N can also obtain good head contact with the tape T, and therefore normal running is possible. During playback, unstable head touch does not cause output level fluctuations, deterioration of azimuth characteristics, or increase in wow and flutter.

Furthermore, since the bad lever 54 is made of permalloy or the like having a magnetic shielding effect, a shielding effect corresponding to the normal head 21N can be obtained.

Further, in the case of this embodiment, in particular, since the single capstan is used, the structure of the drive transmission system is simple, which is very advantageous in terms of wow and flutter and speed deviation.

Furthermore, the guide hole 5b of the cassette is the capstan hole 3.
Since the capstan 23 is formed approximately 1.5 mm deeper than the guide hole 5b, the center position of the capstan 23 is approximately 1.5 mm deeper than the conventional cassette player. It will be formed .5mm deeper. This makes it possible to use a flywheel that is approximately 3 mm larger in diameter than the conventional one, and therefore also makes it possible to improve the moment of inertia of the flywheel 32.

Furthermore, since the head unit can be constructed within the left half of the cassette in FIG. 7, the degree of freedom in design and mechanical design of the cassette player housing corresponding to the right half is greatly improved.

Incidentally, in this embodiment, a disk drive type drive transmission system is used as an example as shown in FIG. 2, but a direct drive type in which the flywheel is directly rotated by a motor shaft may also be used.

In the present invention, the positions of the heads and the like relative to the holes and windows of the cassette are not limited to the examples shown in FIGS. 1(a) and 1(b). It is also conceivable to insert and remove the magnetic head and not use the magnetic head window 1. In any case, if the magnetic head is inserted through a window other than the magnetic head window 1, a corresponding head pad mechanism may be provided6. Although we have explained the example, even if the cassette is a one-way type that cannot be reversed or has a structure with two capstans for normal running and reverse running, the magnetic head can be inserted from other than the magnetic head window 1 of the cassette. It goes without saying that the present invention is applicable when the head device section is configured in such a manner.

[Effects of the Invention] As explained above, the cassette tape player of the present invention has a head pad lever in which a head pad is attached through a hole continuous to a window other than the magnetic head window, through which a magnetic head is inserted and removed. is inserted, and the magnetic head and head pad face each other, so even if the magnetic head is inserted through a window other than the magnetic head window, it can obtain the appropriate pressure contact force against the tape, ensuring good recording and playback. It has the effect of being able to perform actions.

Furthermore, since the head pad lever is made of a material that has a magnetic shielding effect, a shielding effect corresponding to the magnetic head inserted from other than the magnetic head window can also be obtained at the same time.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are conceptual diagrams showing the positional relationship between the head unit and the loaded cassette of a playback-only machine and a recording/playback machine that are embodiments of the present invention, and FIGS. 2(a) and 2(b) )(c)
(d) is an explanatory diagram of the configuration and operation of the drive transmission system in the embodiment shown in Fig. 1 (a), and Figs. 3 (a) and (b) show the head device section in the embodiment shown in Fig. 1 (a). 4(a) and 4(b) are plan views and side views of the pad lever, and FIG. 6(a), 6(b), and 6(c) are explanatory diagrams of the operation of the magnetic head of the head device section of FIG. 3. FIGS. 7(a) and 7(b) are diagrams of the head device of FIG. 3. Figure 8 is a perspective view of the cassette, Figure 9 is an exploded view of the cassette, and Figures 10 (a) to (d) are diagrams of the conventional head unit and the cassette. It is an explanatory diagram of positional relationship. 1 is a window for the magnetic head, 2a and 2b are windows 2 for the pinch roller.
a, 2b, 3a, 3b are capstan holes 3a, 3a,
4a, 4b are small windows, 5a, 5b are guide holes 5a, 5b,
6 is a pad, 21N is a normal head, 21R is a reverse head, 22 is a pinch roller, 23 is a capstan,
24 is a pad, 25N and 25R are erasing heads, 26 is a guide protrusion, 30 is a motor section, 31 is a belt, 32 is a flywheel, 33 is a bearing, 34 is a reduction gear, 35 is a letter 1 lever, 42 is an NR lever, 47 is a crimping lever, 48N
, 48R is l\rad bar, 52 is pinch lever, 54
indicates the pad lever. Figure 2 (b) 54b 54 Figure 4 Compact cassette tape Figure 8 Figure 9 3b 5b 5a 3a Figure 1o Procedural Amendment (Mutsu) January 8, 1991

Claims (2)

[Claims] (1) Inserting and removing the magnetic head of a compact cassette tape in a cassette tape player whose head unit is configured to bring the magnetic head into contact with the magnetic tape from a window other than the magnetic head window of the compact cassette tape. A cassette tape player characterized in that a head pad lever to which a head pad is attached is inserted through a hole continuous to a window. (2) The cassette tape player according to claim 1, wherein the head pad lever is made of a material having a magnetic shielding effect.