JP2570193B2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel tape recorder. For details, see Video Tape Recorder (hereafter,
"VTR". ) Or a rotary magnetic head such as an audio tape recorder (hereinafter, referred to as "DAT") based on a PCM (pulse code modulation) recording method, and the axial direction of the head is perpendicular to the reference plane of the recording / reproducing unit. Has a head drum that is provided at a predetermined angle with respect to the recording or reproduction of the magnetic tape is wound around the head drum at a predetermined winding angle, and
A tape recorder which is wound in a direction extending obliquely to a direction orthogonal to the axial direction of the head drum, that is, in a state of being wound in a substantially spiral direction, particularly a tape cassette to be used, is mounted at a predetermined mounting position of the tape recorder. The present invention relates to a tape recorder in which a part of a head drum is advanced with respect to the head drum so that a part of the head drum is positioned inside an open state of a lid that opens and closes a tape drawing surface while the magnetic tape is By improving the form of the part that regulates the tape path in the part immediately before the winding start position and the part immediately before the winding position with respect to the head drum, without increasing the load on the tape running, Without increasing the tilt angle of the head drum, and thus increasing the thickness of the tape recorder Ku is intended to provide a novel tape recorder to be able to increase the wrap angle of the magnetic tape relative to the head drum.

[0002]

2. Description of the Related Art A video signal or the like in a VTR or D
The recording of audio signals and the like in an AT is usually performed while forming tracks extending obliquely to the running direction of the magnetic tape, so that recording and reproduction in these tape recorders are stored in a tape cassette. The magnetic tape is loaded in such a manner that a part of the magnetic tape is provided with a rotating magnetic head and is wound obliquely around a head drum inclined at a predetermined angle with respect to the axial direction of the tape reel of the tape cassette. It has become.

[0003] By the way, there are several types of loading methods for magnetic tapes, that is, tape loading methods today. One of them is a method called "M-loading". There is.

In the tape loading by this method, the magnetic tape pulled out from the tape cassette is generally approximately M
Since the tape passes through a tape path having a letter shape, that is, a tape path that is substantially symmetrical with respect to the head drum, the magnetic tape does not protrude greatly to the rear side of the head drum, and is used for loading. There is an advantage that the mechanism can also have a relatively simple structure, and the slope required for the mechanical chassis need only be the drum base.

As described above, since the magnetic tape needs to be wound obliquely around the head drum, at least the height at the winding start position or the height at the winding end position with respect to the head drum and the tape cassette tape There must be some level difference between the height of the drawer and the height,
According to the M-loading method, the steps can be distributed almost equally to the left and right sides of the head drum, that is, to the winding start position side and the winding end position side, so that the tape guide mechanism can be relatively easily configured. And the height of the magnetic tape can be changed without difficulty.

FIG. 4 schematically shows an example a of a conventional VTR in which the tape loading system is the M loading system.

[0007] b is a mechanical chassis. Reference numeral c denotes a head drum provided at a position near the rear end of the mechanical chassis b, in which a video head (not shown) is provided so as to be rotatable along the outer peripheral surface thereof and in a direction perpendicular to the mechanical chassis b. Are provided at a predetermined angle to the left with respect to.

Reference numerals d and d 'denote tape loading blocks provided so that the moving direction is guided by guide means (not shown).
And d ', inclined guide posts e, e' inclined at a predetermined angle with respect to the vertical axis and guide rollers f, f 'are provided upright. These tape loading blocks d and d 'have reached the position shown by the two-dot chain line in the figure (hereinafter, referred to as "non-loading position") before the tape loading is performed, and the tape loading is performed. Is performed, the position is moved to a position indicated by a solid line in the figure (hereinafter, referred to as a "loading completion position").

G and h are fixed guide posts fixedly provided on the mechanical chassis b, and i is a cap stun.
Also, j is a pinch roller, k is a tenregi pin,
The pinch roller j and the ten leg pin k are at the position shown by the two-dot chain line in the figure before the tape loading is performed, and are moved to the position shown by the solid line in the figure when the tape loading is performed. It has become.

1 is a tape cassette, m is a tape drawing recess formed on the front surface of the cassette case n,
o and o 'are tape outlets. p is a magnetic tape,
Both ends of the magnetic tape p are fixed to two tape reels q and q 'rotatably housed in a cassette case n, respectively, and a part of the magnetic tape p is led out of the cassette case n, and the tape is pulled out. Through the front surface of the concave portion m, that is, the tape drawing surface.

Then, when the tape cassette is mounted on the VTRa, the inclined guide posts e and e 'of the tape loading blocks d and d', the guide rollers f and f ',
Both the pinch roller j and the ten leg pin k are relatively positioned in the tape pull-out recess m of the tape cassette l.

When the tape is loaded, the guide blocks d and d 'are moved to the loading completion position, and the pinch roller j and the ten leg pin k are moved to the positions shown by solid lines in FIG.

As a result, a portion of the magnetic tape p drawn out of the cassette case n is passed through a substantially M-shaped tape path as shown by a solid line in FIG. The recording is performed on the magnetic tape p or the contents recorded on the magnetic tape p are reproduced by rotating the magnetic tape p and rotating the video head from this state.

By the way, the mechanical chassis b of the magnetic tape p
Is changed as follows in the above-described tape path. That is, the height of the magnetic tape p is the height at the tape outlet o (hereinafter referred to as “reference”) while the tape exits the tape outlet o and is wound around the front fixed guide post g, the ten legging pin k, and the rear fixed guide post h. Height)), but the rear fixed guide post h
Is provided obliquely forward and obliquely rightward, so that it is gradually higher than the reference height from here to the left roller guide f, and the left guide roller f
A substantially constant height is maintained between the inclined guide posts e.

When the tape loading is completed, the left inclined guide post e is inclined substantially forward and leftward, so that the magnetic tape p is gradually displaced downward from this position, and the right inclined guide post e is gradually inclined downward. At a position where it is wound around the guide post e ', it comes to a height lower than the reference height. The magnetic tape p is gradually displaced upward from the position where it is wound on the right inclined guide post g, and is gradually displaced upward from the position where it is wound on the right guide roller f '. Is maintained at substantially the same height as the reference height.

Further, as is apparent from the drawing, the tape of the magnetic tape p at the position before the position where the winding to the head drum c is started and the tape at the position before the position where the winding is finished. The path is regulated by being wound around the inclined guide posts e and e ', and is wound around the inclined guide posts e and e' at an angle of about 90 ° or more, respectively.

[0017]

Recently, smaller and higher performance VTRs have been developed.
The demand for small size and high performance for R and the like is increasing.

By the way, when considering miniaturization of a VTR or the like, it is necessary to first miniaturize the head drum, particularly, to reduce its diameter as much as possible.
As the diameter of the head drum is reduced, it is necessary to increase the drum winding angle of the magnetic tape, and the following problem arises from this point.

FIG. 5 shows that the inclination angle of the head drum is 6 ° and 9 °.
The correlation between the winding angle of the magnetic tape and the winding angle of the magnetic tape with respect to the inclined guide post (hereinafter, referred to as the “inclined guide winding angle”) is shown for each case of 場合, 12 ゜, 15 ゜, and 18 ゜. It is a graph.

As is clear from this graph, as the drum winding angle increases, the inclination guide winding angle also gradually increases.

As is known, when recording or reproduction is performed using a magnetic tape, the running speed, tension and the like of the magnetic tape must always be kept constant.

However, if the winding angle of the magnetic tape with respect to a member fixedly provided to the running magnetic tape such as the inclined guide post is large, an extremely large load is applied to the running tape. Therefore, the tape tension tends to change, and the running speed becomes unstable.

Therefore, in order to keep the angle of wrap of the inclined guide as small as possible even if the angle of wrap of the magnetic tape drum is increased, it is conceivable to increase the angle of inclination of the head drum.

That is, for example, in the graph of FIG.
When the drum wrap angle of the magnetic tape is 221 °, the tilt guide wrap angle becomes approximately 100 ° or more when the head drum tilt angle is 6 °, but the head drum tilt angle is reduced to 18 °. For example, the winding angle of the inclined guide can be suppressed to about 70 °.

However, this leads to the following problem.

That is, when the inclination angle of the head drum is increased, the step between the height of the magnetic tape at the position where the magnetic tape is wound around the head drum and the height of the tape cassette at the tape pull-out surface becomes larger. Overloading will occur and eventually the running of the tape becomes unstable, and troubles such as the magnetic tape being loaded during tape loading not being engaged with the leads formed on the head drum are likely to occur. ,
Such a problem arises.

Further, when the inclination angle of the head drum is increased, the highest portion of the head drum becomes farther from the mechanical chassis, so that the height of the head drum is increased, and eventually the thickness of the VTR is increased. That is, the VTR becomes large.

In order to reduce the depth of the VTR,
In a state where the tape cassette is mounted at a predetermined mounting position, it is conceivable that a part of the head drum is positioned inside a front cover (at an open position) provided on the tape cassette. the inclination angle of the head drum is large, since the upper end face emerges may clash with the front cover, eventually, becomes that not even this to reduce the depth of the VTR by such means.

[0029]

According to the present invention, there is provided a tape recorder, comprising: an inclined guide post;
In the tape in the tape path between the tape and the guide roller
The twist angle of the magnetic tape around the core wire should be larger than the tilt angle of the axis of the head drum with respect to the direction perpendicular to the mechanical chassis, so that the upper end surface of the head drum does not hit the inside of the front lid of the tape cassette when tape loading is completed It is like that.

[0030]

Therefore, according to the present invention, it is not necessary to increase the tilt angle of the head drum more than necessary by increasing the twist angle in the path between the tilt guide post of the magnetic tape and the guide roller. In other words, a large wrap angle can be obtained without making the inclination angle of the head drum so large, so that a large amount of magnetic tape can be wound, so that the height of the head drum can be kept to the minimum necessary. The head drum can be mounted in a state where a part of the head drum is located inside the front cover.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the tape recorder of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

The embodiment shown in the drawings applies the present invention to a VTR.
It is applied to In addition, the explanation first
This is performed for the tape cassette used for R, and then for each part of the VTR.

Reference numeral 1 denotes a tape cassette which is detachably attached to a VTR (to be described later) (shown in a state attached to the VTR in the drawing).

Reference numeral 2 denotes a cassette case (a horizontal section is shown in FIG. 1 and a vertical section is shown in FIG. 2) of the tape cassette 1. The cassette case 2 has a relatively thin box shape. And a front surface thereof is a tape drawing surface.

Reference numeral 3 denotes a front cover (shown only in FIG. 2) which is long in the left-right direction as viewed from above (only shown in FIG. 2). The tape cassette 1 is rotatably supported at the front end.
2 is not attached to the VTR, FIG.
As shown by the dashed line, the tape drawer of the cassette case 2 is at a position to close the tape drawing surface (hereinafter, referred to as a “closed position”). When the tape cassette 1 is mounted on the VTR, it is shown by a solid line in FIG. Thus, the cassette is moved to a position where the tape drawing surface of the cassette case 2 is opened (hereinafter, referred to as an “open position”).

The state where the front cover 3 is in the closed position is held by a cover locking means (not shown).

Reference numeral 4 denotes a tape pull-out recess formed on the tape pull-out surface of the cassette case 2. Reference numerals 5 and 6 denote tape outlets formed on both left and right sides of the tape pull-out recess 4 on the tape pull-out surface of the cassette case 2, and these tape outlets 5 and 6 are located near the tape pull-out recess 4 in the cassette. Guides 7 and 8 are formed.

Numerals 9 and 10 are tape reels rotatably stored in the cassette case 2, and 11 and 11 'are reel hubs. In addition, the left one 9 of these tape reels 9 and 10 is a supply-side tape reel (hereinafter, referred to as a tape reel).
This is called "S reel". ), And the right side 10 is a tape reel on the winding side (hereinafter, referred to as "T reel").

Numeral 12 denotes a magnetic tape.
2 has both ends fixed to the tape reels 9 and 10, respectively, and is wound by a predetermined amount.
The path shown by the dotted line is passed.

That is, in this state, the magnetic tape 12
Is drawn out of the S-reel 9 and is led out of the cassette case 2 from the tape outlet 5 on the left side of the cassette case 2, is passed along the tape drawing surface, and is introduced into the cassette case 2 from the tape outlet 6 on the right side. And T reel 10
Has been wound up. The tape path outside the cassette case 2 is regulated by guides 7 and 8 in the cassette.

Reference numeral 13 denotes a VTR.

Specific values of the diameter, inclination angle, etc., of predetermined members provided in the VTR 13 are shown, but these values are those for a head drum having an outer diameter of approximately 40 mm. And the magnetic tape 12 is attached to the head drum by approximately 22
This shows an example in the case of winding with a winding angle of 1 °.

Reference numerals 14 and 15 are reel stands.

The reel bases 14 and 15 are arranged in the portion near the front edge of the upper surface of the mechanical chassis 16 so as to be separated from each other in the left-right direction, and are rotatably supported by a support shaft (not shown).

Although not shown, the reel base 1
At the upper ends of the tape cassettes 4 and 15, there are provided reel engaging shafts which are detachably engaged with the reel hubs 11 and 11 'of the tape reels 9 and 10 accommodated in the tape cassette 1. When mounted in a predetermined cassette mounting position, the reel engaging shafts are separately engaged with the tape reels 9 and 10, whereby the S reel 9 and the T reel 10 are moved to the left reel base 14 and the right reel base 14, respectively. And the reel base 15 is rotated integrally.

Reference numeral 17 denotes a head drum.

The head drum 17 is formed in a substantially cylindrical shape as a whole, and a rotating magnetic head (not shown) for recording and reproduction can be moved along the outer peripheral surface of the head drum 17 to a substantially intermediate position in the axial direction. The magnetic head is rotated so as to draw a circular movement trajectory along the outer peripheral surface of the head drum 17 when a predetermined rotating portion of the head drum 17 is rotated.

Then, as described above, the head drum 1
7 has an outer diameter of approximately 40 mm, and is provided such that its axial direction is inclined approximately 4 ° to the left side with respect to a reference surface of the VTR 13, for example, a direction perpendicular to the upper surface of the mechanical chassis 16. ing.

Numeral 18 denotes a drum support fixed to the upper surface of the mechanical chassis 16. The head drum 17 has a mounting piece (not shown) provided thereon fixed to the head support 18.

The rotating portion of the head drum 17 is rotated by rotating a rotating shaft (not shown) on which the head drum 17 is supported by a drum motor.

Reference numerals 19 and 20 are inclined guide posts.

The inclined guide posts 19 and 20 are one of the tape guide members for regulating the path of the magnetic tape 12 drawn from the tape cassette 1, and have a function of changing the height of the path. And is fixedly provided on the upper surface of the mechanical chassis 16.

That is, these inclined guide posts 19 and 2
Numeral 0 is a linear position extending in the left-right direction passing through a position slightly forward from the rear end of the head drum 17 in the mechanical chassis 16 and standing up from a position substantially equal to each other across the head drum 17. Have been.

The left one 19 of these inclined guide posts 19 and 20 is approximately 16.9 diagonally forward and rightward.
The right tilt guide post 20 is also tilted approximately 16.983 ° to the right and diagonally rearward.

The inclined guide posts 19 and 20
Has a diameter of approximately 3 mm.

Reference numerals 21 and 22 denote guide rollers provided movably with respect to the mechanical chassis 16, and these guide rollers 21 and 22 are rotatably supported by a moving block (not shown).

The moving block is supported by a predetermined guide means guided in the moving direction and is moved by the predetermined moving means. The position indicated by a two-dot chain line (hereinafter referred to as the “non-loading position” for the guide rollers 21 and 22) is indicated by a solid line in the same figure, and the position illustrated in FIGS. 22 (referred to as a “loading complete position”).

Further, flanges 23, 23 and 24, 24 are provided in contact with both ends of the guide rollers 21 and 22, and are provided so that the height of the flanges 23, 23, 24, 24 with respect to the moving block on which the guide rollers 21 and 22 are supported can be adjusted. .

When the guide rollers 21 and 22 are at the loading completion position, the left roller 21 and the right roller 22 are substantially diagonally forward and left with respect to the direction perpendicular to the reference plane. They are provided so as to be tilted approximately 7.315 ° to the substantially left rearward.

The outer diameter of each of the guide rollers 21 and 22 is approximately 4 mm.

Reference numerals 25 and 26 denote swing guides movably provided with respect to the mechanical chassis 16. The swing guides 25 and 26 have a roller-like structure.
FIG. 1 shows a state before tape loading is performed.
At the position indicated by the two-dot chain line (hereinafter referred to as “non-loading position”).
Say ), And when tape loading is performed, the tape is moved to a position indicated by a solid line in FIG. 1 (hereinafter, referred to as a “loading completion position”).

That is, when tape loading is performed, the left swing guide 25 is positioned so as to approach the left inclined guide post 19 from the left side thereof.
The right swing guide 26 is the right inclined guide post 2.
0 will be located close to the right side.

Reference numeral 27 denotes a fixed guide post that stands upright from the mechanical chassis 16, and the fixed guide post 27 is provided substantially in front of the left swing guide 25 that has reached the loading completed position.

Reference numeral 28 denotes a capstan. The capstan 28 is disposed at a position in the mechanical chassis 16 slightly away from the right swing guide 26 at the loading completion position, and performs recording or reproduction. When it is turned on, it is rotated by a capstan motor (not shown).

Reference numeral 29 denotes a pinch roller, and reference numeral 30 denotes a tenregi pin. The pinch roller 29 and tenregi pin 30 are positioned at a position shown by a two-dot chain line in FIG. 1 before tape loading is performed (hereinafter referred to as a “non-loading position”). ), And when tape loading is performed, the tape is moved to a position indicated by a solid line in FIG. 1 (hereinafter, referred to as a “loading completion position”).

Therefore, when recording on the magnetic tape 12 or reproducing the content recorded on the magnetic tape 12, first, the tape cassette 1 is mounted on a predetermined cassette mounting position of the VTR 13.

This mounting is performed as follows by cassette mounting means (not shown).

That is, when the tape cassette 1 is inserted into the cassette holding member provided in the cassette mounting means, the cassette case 2 is held by the cassette holding member, and the front cover 3 is moved to the open position.

Then, the cassette holding member is moved toward the back of the VTR 13, that is, so as to be advanced with respect to the head drum 17, and a portion of the magnetic tape 12 located on the tape pull-out surface of the cassette case 2. Of the head drum 17 is pressed against the upper end of a portion of the outer peripheral surface of the head drum 17 which is located substantially forward.

In this state, the front end of the head drum 17 is relatively positioned inside the front cover 3 at the open position, and the part of the magnetic tape 12 that is led out of the cassette case 2 is A path shown by a two-dot chain line in FIG. 1 is passed.

Then, the cassette holding member is moved downward from this state. As a result, the tape cassette 1
It is mounted at a predetermined cassette mounting position in TR13.

The positioning of the tape cassette 1 with respect to the VTR 13 is performed by cassette positioning means (not shown) provided on the mechanical chassis 16.

Then, together with the tape reels 9 and 1,
0, the reel engaging shafts (not shown) of the reel stands 14 and 15 are relatively engaged with engaging holes (not shown) formed in the reel hubs 11 and 11 ′. , T reel 10 and right reel stand 15
Are rotated integrally.

The portion of the magnetic tape 12 led out of the cassette case 2 is moved downward so that the substantially central portion thereof slides on the outer peripheral surface of the head drum 17 while passing through the above-mentioned path. When the tape cassette 1 is mounted at the cassette mounting position, the head cassette 17 is positioned in contact with the substantially central portion of the head drum 17 in the height direction.

When the tape cassette 1 is mounted at the cassette mounting position of the VTR 13, the guide rollers 21, 22 provided on the VTR 13 side, the swing guides 25, 26,
Both the pinch roller 29 and the ten leg pin 30 are relatively positioned in the tape pull-out recess 4 formed in the cassette case 2.

Then, when a command to perform the tape loading is issued, the guide rollers 21 and 22, the swing guides 25 and 26, the pinch roller 29 and the ten regi pin 30
Are respectively moved to the loading completion position.

Then, the pinch roller 29 is pressed against the capstan 28 with the magnetic tape 12 interposed therebetween, and the tension pin 30 comes to substantially the front side of the fixed guide post 27.

When the tape loading is completed, the portion of the magnetic tape 12 pulled out of the cassette case 2 is passed through the tape path shown by the solid line in FIG.

That is, in this state, the magnetic tape 12
Is pulled out of the S reel 9 and is led out of the cassette case 2 from the tape outlet 5 on the left side of the cassette case 2, and the ten-leg pin 30-fixed guide post 27-left swing guide 25-left inclined guide post 19- After being wound on the left guide roller 21 in this order, it is wound on the head drum 17, and after the winding on the head drum 17 is completed, the right guide roller 22-the right inclined guide post 20- The right reel guide 26 and the capstan 28 are wound in this order, and are introduced into the cassette case 2 from the tape outlet 6 on the right side of the cassette case 2, and the T reel 1
It is passed through a path such as winding to zero.

When the tape loading is completed, the path between the winding start position and the winding end position of the magnetic tape 12 with respect to the head drum 17 and the inclined guide posts 19 and 20 is determined by the guide rollers 21 and 20.
22.

Then, in this state, the magnetic tape 1
2 is wound around the head drum 17 at a winding angle of about 221 °.

In this tape pass, the magnetic tape 12 is wound around the left inclined guide post 19 and the right inclined guide post 20 by approximately 53 °, respectively, and the left guide roller 21 and the right guide are respectively wound. Each of the rollers 22 is wound about 120 °.

The path length between the winding start position with respect to the head drum 17 and the left guide roller 21 and the path length between the winding end position with respect to the head drum 17 and the right guide roller 22 are: It is about 8 millimeters.

Further, the twist angle of the magnetic tape 12 in the path between the left inclined guide post 19 and the left guide roller 21 (the magnetic tape twist around the tape center line).
The twist angle) and the twist angle in the path between the right inclined guide post 20 and the right guide roller 22 are each approximately 10 °.

Therefore, recording or reproduction is performed while the magnetic tape 12 is passed through the above-described tape path.
The rotation is performed by rotating a predetermined rotating portion of the head drum 17.

Then, the running of the magnetic tape 12 is performed by rotating the capstan 28 which is rotated at a constant speed in the counterclockwise direction.
And a pinch roller 29 crimped thereon.

Accordingly, the magnetic tape 12 runs so as to be pulled out from the S reel 9 and wound on the T reel 10.

The predetermined rotating portion of the head drum 17 is rotated at a high speed in a counterclockwise direction, that is, in the same direction as the running direction of the magnetic tape 12 wound therearound. Recording is performed while forming a track extending obliquely to the running direction on the track 12, or reproduction is performed while tracing the track.

Since the guide rollers 21 and 22 are provided in an inclined state, the running magnetic tape 12
Of the tape is urged so as to move in the width direction of the tape by sliding the outer peripheral surface thereof, and such movement is caused by the flange 23 provided on the guide rollers 21 and 22. 23 and 24, 24.

[0090]

As is apparent from the above description, the tape recorder of the present invention comprises a tape cassette in which a tape reel on which a magnetic tape is wound is housed and a front cover for opening and closing a tape drawing surface is provided. A head drum provided with a rotating magnetic head and having an axial direction inclined at a predetermined angle with respect to the axial direction of the tape reel is provided, and the magnetic tape is a part of a portion pulled out from the tape cassette. A predetermined winding angle is wound around the head drum, and a predetermined angle is applied to the inclined guide post and the guide roller at a position before the position where the winding on the head drum is started and a position before the position where the winding is ended. a tape recorder that is loaded as is passed through the tape path wound in order, the inclined moth And Doposuto and the guide roller
Magnetic tape around the tape center line in the tape path between
The angle of twist of the head drum is larger than the angle of inclination of the axis of the head drum with respect to the direction perpendicular to the mechanical chassis, so that the upper end surface of the head drum does not hit the inside of the front lid of the tape cassette when tape loading is completed. It is characterized by.

Therefore, according to the present invention, it is not necessary to increase the tilt angle of the head drum more than necessary by increasing the twist angle in the path between the tilt guide post of the magnetic tape and the guide roller. In other words, a large wrap angle can be obtained without making the inclination angle of the head drum so large, so that a large amount of magnetic tape can be wound, so that the height of the head drum can be kept to the minimum necessary. The head drum can be mounted in a state where a part of the head drum is located inside the front cover.

Incidentally, the specific numerical values of the diameter of the head drum and the tape wrapping angle with respect to the diameter of the head drum shown in the above embodiment do not limit the dimensions and the like of each part of the tape recorder to which the present invention is applied.

[Brief description of the drawings]

FIG. 1 shows an embodiment in which the tape recorder of the present invention is applied to a video tape recorder together with FIGS. 2 and 3, and FIG. 1 is a plan view showing a state where a tape cassette is mounted.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a side view of a main part.

FIG. 4 is a plan view showing an example of a conventional video tape recorder with a tape cassette mounted.

FIG. 5 is a graph showing a correlation between a tape winding angle with respect to a head drum and a tape winding angle with respect to an inclined guide post.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tape cassette 3 Front cover 9, 10 Tape reel 12 Magnetic tape 13 Tape recorder 16 Mechanical chassis 17 Head drum 19, 20 Inclined guide post 21, 22 Guide roller

Claims (1)

(57) [Claims] 1. A tape cassette which houses a tape reel on which a magnetic tape is wound and which is provided with a front cover for opening and closing a tape drawing-out surface, is equipped with a rotating magnetic head, and has an axial direction of the tape reel. A head drum provided at a predetermined angle with respect to the axial direction of
In the magnetic tape, a part of a portion pulled out from the tape cassette is wound around the head drum by a predetermined winding angle, and the magnetic tape is positioned just before a position where winding on the head drum is started and a position where winding is ended. in the previous position to the respective inclined guide post and the guide roller a tape recorder which is loaded as is passed through the tape path is wound in a predetermined order, the inclined moth
In the tape path between the id post and the guide roller
The angle of twist of the magnetic tape around the center line of the tape is larger than the angle of inclination of the axis of the head drum with respect to the direction perpendicular to the mechanical chassis. A tape recorder characterized by being constructed so as not to be hit.