JPH0799603B2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The tape recorder of the present invention will be described in accordance with the following items.

A. Industrial field of use B. Outline of invention C. Prior art C-1. General background C-2. Conventional VTR [Fig. 4] D. Problems to be solved by the invention [Fig. 5] E. Means for Solving Problems F. Embodiment a. Tape cassette [Fig. 1, Fig. 2] b. VTR [Fig. 1, Fig. 2] b-1. Reel stand b-2. Head Drum [Figs. 1 to 3] b-3. Inclined guide post [Figs. 1 to 3] b-4. Guide roller [Figs. 1 to 3] b-5. Other members [Fig. Fig. 1] c. Mounting of tape cassette d. Tape loading e. Tape path when tape loading is completed [Fig. 1] f. Tape running G. Effects of the invention (A. Industrial field of application) The present invention is novel. Tape recorder. For more information,
Video tape recorder (hereinafter referred to as "VTR") or audio tape recorder using PCM (pulse code modulation) recording method (hereinafter referred to as "DA
T ”. ), Etc., and a head drum whose axial direction is inclined at a predetermined angle with respect to the direction perpendicular to the reference plane of the recording / reproducing unit. A tape recorder which is wound around the head drum at a predetermined winding angle and is wound in a direction extending obliquely with respect to a direction orthogonal to the axial direction of the head drum, that is, in a substantially spiral direction, particularly used. The tape cassette is advanced with respect to the head drum so that a part of the head drum is located inside the opened state of the lid body that opens and closes the tape pulling surface while the tape cassette is mounted in the predetermined mounting position of the tape recorder. It is related to the tape recorder. By improving the form of the part of the magnetic tape that regulates the tape path immediately before the winding start position with respect to the head drum and immediately before the winding position, without increasing the load on the running of the tape. Moreover, it is an object of the present invention to provide a novel tape recorder capable of increasing the winding angle of the magnetic tape with respect to the head drum without increasing the inclination angle of the head drum.

(B. Overview of the Invention) The tape recorder of the present invention is equipped with a tape cassette that accommodates a tape reel around which a magnetic tape is wound and has a front lid that opens and closes the tape pull-out surface, and is equipped with a rotary magnetic head. A head drum is provided, the axial direction of which is inclined at a predetermined angle with respect to the axial direction of the tape reel, and the magnetic tape has a part of a portion pulled out from the tape cassette wound around the head drum in a predetermined manner. In front of the inclined guide post fixedly provided on the predetermined mechanical chassis at a position just before the position where the winding is performed on the head drum and immediately before the position where the winding with respect to the head drum is started and a position immediately after the position where the winding is ended. In a tape recorder that is loaded so that it passes through the tape path that is wound from the tape cassette, pull it from the tape cassette. A part of the part of the ejected magnetic tape pulled out from the tape cassette is wound around the head drum at a predetermined wrapping angle and the height at the position where the winding on the head drum is started and / or the position where the winding is finished is increased. The displacement between the steps between the height and the height of the tape pulling surface is mainly performed by the inclined guide post, and the position of the magnetic tape wound around the inclined guide post and the winding start position and winding position with respect to the head drum. The path between the head drum and the end position is regulated by a guide roller having a flange so that the head drum can be supported without increasing the load on the running of the tape and without increasing the inclination angle of the head drum. The tape winding angle can be increased.

(C. Prior Art) (C-1. General Background) Recording of a video signal or the like in a VTR or an audio signal or the like in a DAT is usually performed while forming a track extending obliquely to the running direction of the magnetic tape. Since recording and reproduction in these tape recorders are performed with respect to the axial direction of the tape reel of the tape cassette, the magnetic tape stored in the tape cassette is partially provided with a rotating magnetic head. It is carried out in a loaded state so as to be obliquely wound around a head drum inclined at a predetermined angle.

By the way, there are several kinds of loading methods for magnetic tapes, that is, tape loading methods, and one of them is a so-called "M loading" method.

In the tape loading by this method, the magnetic tape pulled out from the tape cassette is usually passed through a tape path having a substantially M-shape, that is, a tape path that is substantially symmetrical with respect to the head drum. The magnetic tape does not largely protrude to the rear side of the head drum, and the mechanism for loading can be a relatively simple structure, and the slope required for the mechanical chassis can be done only with the drum base. There is.

Further, 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 withdrawing surface of the tape cassette. It is necessary to provide a certain level difference between the height and the height. According to the M loading method, the level difference is provided on both the left and right sides of the head drum, that is, the winding start position side and the winding end position side. Since the tape guide mechanism can be relatively easily configured, the height of the magnetic tape can be changed without difficulty.

(C-2. Conventional VTR) [Fig. 4] Fig. 4 schematically shows an example a of a conventional VTR in which the tape loading system is the M loading system.

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, which is provided so that a video head (not shown) is rotatably moved along the outer peripheral surface thereof and a direction perpendicular to the mechanical chassis b. It is provided in a state of being inclined at a predetermined angle to the left.

Reference numerals d and d ′ are tape loading blocks provided so as to be guided in the moving direction by guide means (not shown), and the tape loading blocks d and d ′ are inclined at a predetermined angle with respect to the vertical axis. Guide posts e and e'and guide rollers f and f'are erected. The tape loading blocks d and d'are located at the position indicated by the chain double-dashed line in the figure (hereinafter referred to as "non-loading position") before the tape loading is performed, and the tape loading block d and d ' When it is carried out, it is moved to the position shown by the solid line in the figure (hereinafter referred to as the "loading completion position").

Reference numerals g and h are fixed guide posts fixedly provided on the mechanical chassis b, and i is a capstan. Further, i is a pinch roller, k is a tenon pin, and these pinch roller j and tenon pin k are located at the position shown by the chain double-dashed line in FIG. It is designed to be moved to the position shown by the solid line in the figure.

1 is a tape cassette, m is its cassette case n
The tape pull-out concave portions formed on the front surface of the tape, o and o ′ are tape outlets. p is a magnetic tape, and the magnetic tape p
Both ends of which are separately fixed to two tape reels q and q'rotatably housed in a cassette case n, and a part of them is led out of the cassette case n, and
It is passed through the front surface of the tape pull-out recess m, that is, the tape pull-out surface.

Therefore, when the tape cassette 1 is mounted on the VTa Ra, the inclined guide posts e and e'of the tape loading blocks d and d ', the guide rollers f and f', the pinch roller j and the ten-legged pin k are all relatively taped. It is located in the tape drawing-out concave portion m of the cassette 1.

Then, when tape loading is performed, the guide blocks d and d ′ are moved to the loading completion position, and the pinch roller j and the ten-pointing pin k are moved to the positions shown by solid lines in the figure.

As a result, the part of the magnetic tape p pulled out from the cassette case x is passed through a tape path having a substantially M-shape as shown by the solid line in the figure, and a part of the part is wound around the head drum c in a predetermined manner. It is supposed to be wrapped with a corner,
Recording on the magnetic tape p or reproduction of the contents recorded on the magnetic tape p is performed by running the magnetic tape p and rotating the video head from this state.

By the way, the height of the magnetic tape p from the mechanical chassis b is changed in the above-described tape path as follows. That is, the height of the magnetic tape p is such that the height at the tape outlet o (hereinafter, referred to as “standard” while the tape is exiting the tape outlet o and wound around the front fixed guide post g−the ten pin pin k−the rear fixed guide post h). However, since the fixed guide post h on the rear side is provided so as to be tilted substantially diagonally right to the front, the distance from here to the roller guide f on the left side is as described above. The height gradually increases from the reference height, and a substantially constant height is maintained between the left guide roller f and the inclined guide post e. Since the left tilted guide post e is tilted substantially leftward and forward in the state where the tape loading is completed, the magnetic tape p is gradually displaced downward from here, and the right tilted guide post e. It comes to a height lower than the reference height at the position where it is wrapped around the ′. Further, the magnetic tape p is gradually displaced upward from the position where it is wound around the right inclined guide post g, and from the position where it is wound around the right guide roller f ', to the tape outlet o'on the right side of the cassette case n. During the period up to, the height is maintained at approximately the same height as the reference height.

Further, as is clear from the drawing, the tape path of the magnetic tape p in front of the position where the winding around the head drum c is started and in the part before the position where the winding is ended is inclined. It is regulated by being wound around the guide posts e and e ′, and is wound around the inclined guide posts e and e ′ at an angle of approximately 90 ° or more.

(D. Problems to be solved by the invention) [Fig. 5] Recently, smaller and higher performance VTRs and the like have been developed, which are smaller and higher performance than VTRs. The demand for things is getting stronger.

By the way, when considering the miniaturization of VTRs and the like, first of all, the challenge is to miniaturize the head drum, especially to reduce its diameter as much as possible. It is necessary to increase the tape winding angle of the tape, which causes the following problems.

Fig. 5 shows the head drum tilt angles of 6 °, 9 °, 12 °, 15
6 is a graph showing a correlation between a winding angle of a magnetic tape on a drum and a winding angle of an inclined guide post (hereinafter, referred to as an “inclined guide winding angle”) in each case of ° and 18 °.

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

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

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

Therefore, it is conceivable to increase the inclination angle of the head drum in order to keep the inclination guide winding angle as small as possible even if the drum winding angle of the magnetic tape is increased. That is, for example, in the graph of FIG. 5, when the drum winding angle of the magnetic tape is 221 °, if the head drum inclination angle is 6 °, the inclination guide winding angle becomes approximately 100 ° or more. However, if the head drum has an inclination angle of 18 °, the inclination angle of the inclined guide can be suppressed to about 70 °.

However, doing so causes the following problems.

That is, when the inclination angle of the head drum increases, the step between the height of the magnetic tape wound around the head drum and the height of the tape pull-out surface of the tape cassette becomes larger, which makes it difficult to run the magnetic tape. As a result, the running of the tape becomes unstable, and troubles such as the magnetic tape loaded at the time of tape loading is not engaged with the lead formed on the head drum are likely to occur. Is coming.

Furthermore, as the inclination angle of the head drum increases, the highest part of the head drum moves farther from the mechanical chassis, which increases the height of the head drum, which eventually increases the thickness of the VTR, that is, the VTR. Will also be large.

Further, in order to reduce the depth of the VTR, a part of the head drum is located inside the front cover (in the open position) provided in the tape cassette when the tape cassette is installed in the predetermined installation position. However, if the head drum has a large inclination angle, the upper end surface of the head drum may come out of the front cover, so that the depth of the VTR can be reduced by such means. It will not be possible.

(E. Means for Solving Problems) In order to solve the above problems, the tape recorder of the present invention has a winding start position and a winding position of a magnetic tape with respect to a head drum in a state where at least tape loading is completed. The tape path between the attachment end position and the inclined guide post is regulated by a guide roller with a flange.

Therefore, according to the present invention, the portion of the magnetic tape immediately before the winding start position with respect to the head drum and the portion immediately before the winding end position, that is, the larger the tape winding angle with respect to the head drum, the larger the angle. Since the part that needs to be bent is wrapped around a guide roller with a flange that does not give a large load to the running of the tape, even if the wrap angle becomes large, the running of the tape Therefore, the tape winding angle can be increased as much as possible without increasing the inclination angle of the head drum.

(F. Examples) The details of the tape recorder of the present invention will be described below with reference to the examples shown in the accompanying drawings.

The embodiment shown in the drawings is an application of the present invention to a VTR. Further, the description will be given first regarding the tape cassette used for the VTR, and thereafter regarding each part of the VTR.

(A. Tape cassette) [FIGS. 1 and 2] 1 is a tape cassette (shown in a state where it is mounted in a VTR in the drawing) detachably mounted in a VTR described later.

Reference numeral 2 denotes a cassette case of the tape cassette 1 (the horizontal section is shown in FIG. 1 and the vertical section is shown in FIG. 2).
Is formed in a relatively thin box shape, and its front surface is a tape pull-out surface.

Reference numeral 3 denotes a front lid (only shown in FIG. 2) which is substantially in the left-right direction when viewed from above, and the left and right end portions of the front lid 3 are at the front end portions of the left and right side surfaces of the cassette case 2. When the tape cassette 1 is rotatably supported and is not attached to the VTR, as shown by a two-dot chain line in FIG. Position), and when the tape cassette 1 is mounted on the VTR, as shown by the solid line in FIG. 2, a position where the tape pull-out surface of the cassette case 2 is opened (hereinafter referred to as “open position”). Say)). Incidentally, the state in which the front lid 3 is in the closed position is held by a lid locking means (not shown).

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

Reference numerals 9 and 10 are tape reels rotatably housed in the cassette case 2, and 11 and 11 'are reel hubs thereof. The left side 9 of these tape reels 9 and 10 is a supply side tape reel (hereinafter referred to as "S reel"), and the right side 10 is a winding side tape reel (hereinafter referred to as "T reel"). ".

Reference numeral 12 denotes a magnetic tape. Both ends of the magnetic tape 12 are fixed to the tape reels 9 and 10, respectively, and a predetermined amount is wound, and in a state before the tape cassette 1 is mounted on the VTR. Has been passed through the path indicated by the one-dot chain line in FIG. That is, in this state, the magnetic tape 12
Is drawn out from the S reel 9 and led out of the cassette case 2 from the tape outlet 5 on the left side of the cassette case 2, and is introduced along the tape drawing surface into the cassette case 2 from the tape outlet 6 on the right side. And is wound around the T reel 10. The tape path outside the cassette case 2 is regulated by the in-cassette guides 7 and 8.

(B.VTR) [Figs. 1 and 2] 13 is a VTR.

Incidentally, among the members provided in the VTR 13, specific values are shown for the diameter or the inclination angle, etc., but these values use a head drum whose outer shape is about 40 mm, This is an example of a case where the magnetic tape 12 is wound around the head drum at a winding angle of approximately 221 °.

(B-1. Reel stand) 14 and 15 are reel stands. These reel bases 14 and 15 are arranged in a portion of the upper surface of the mechanical chassis 16 near the front end edge 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, reel reel shafts 15 and 11 'of the reel bases 14 and 15 are detachably engaged with the reel hubs 11 and 11' of the tape reels 9 and 10 housed in the tape cassette 1. When the tape cassette 1 is mounted at a predetermined cassette mounting position of the VTR 13, the reel engaging shafts are individually engaged with the tape reels 9 and 10, whereby the S reel 9 is the left reel. The table 14 and the reel table 15 on the right side of the T reel 10 are integrally rotated.

(B-2. Head drum) [FIGS. 1 to 3] Reference numeral 17 is a head drum. The head drum 17 is formed in a substantially cylindrical shape as a whole, and a rotary magnetic head (not shown) for recording / reproducing is provided at a substantially intermediate position in the axial direction in a state where it can be moved along the outer peripheral surface of the head drum 17. The magnetic head is rotated so as to draw a circular movement locus along the outer peripheral surface of the head drum 17 by rotating a predetermined rotating portion of the head drum 17.

Then, as described above, the outer diameter of the head drum 17 is approximately 40.
Is in millimeters and its axial direction is VTR13
The reference plane, for example, is provided in a state of being inclined approximately 4 ° to the left with respect to the direction perpendicular to the upper surface of the mechanical chassis 16.

Reference numeral 18 denotes a drum support table fixed to the upper surface of the mechanical chassis 16, and the head drum 17 has a mounting piece (not shown) provided thereon fixed to the head support table 18.

The rotating portion of the head drum 17 is rotated by rotating a rotation shaft (not shown) supporting the head drum 17 by a drum motor.

(B-3. Inclined guide post) [Figs. 1 to 3] 19 and 20 are inclined guide posts. These inclined guide posts 19 and 20 are one of the tape guide members for restricting the path of the magnetic tape 12 pulled out from the tape cassette 1, and particularly have the function of changing the height of the path. It is fixedly provided on the upper surface of the chassis 16.

That is, these inclined guide posts 19 and 20 are the mechanical chassis.
It is a position on a straight line that extends in the left-right direction from the rear end of the head drum 17 passing through a position closer to the front of the head drum 17, and is erected from a position that is separated from the head drum 17 by substantially the same distance. And these inclined guide posts 19
Left side 19 of 20 and 20 is approximately 16.983 °
Tilt guide post on right side
The 20 is provided to be inclined obliquely rightward and rearward, which is also inclined approximately 16.983 °.

The diameters of these inclined guide posts 19 and 20 are approximately 3 mm.

(B-4. Guide Rollers) [FIGS. 1 to 3] Reference numerals 21 and 22 are guide rollers provided so as to be movable with respect to the mechanical chassis 16.
Is rotatably supported by a moving block (not shown). The moving block is supported by a predetermined guide means which is guided in the moving direction and is moved by the predetermined moving means, whereby the guide rollers 21 and 22 are moved as shown in FIG. A position indicated by a dotted line (hereinafter referred to as "non-loading position" for the guide rollers 21 and 22) and a solid line in the same figure, and a second position
The position shown in FIG. 3 and FIG. 3 (hereinafter, guide rollers 21 and 22
About the "loading completion position". ) Is to be moved between.

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

Then, when the guide rollers 21 and 22 are at the loading completion position, with respect to the direction perpendicular to the reference plane, the left one 21 is substantially left diagonally forward, and the right one 22 is substantially left diagonally. It is provided so as to be inclined rearward by approximately 7.315 °.

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

(B-5. Other members) [FIG. 1] Reference numerals 25 and 26 are swing guides provided movably with respect to the mechanical chassis 16. These swing guides 25 and 26 have a roller-like structure, and In the state before the tape loading is performed, the position has come to the position indicated by the chain double-dashed line in FIG. 1 (hereinafter referred to as “non-loading position”), and when the tape loading is performed, the position indicated by the solid line in FIG. (Hereinafter, referred to as "loading completion position".)
It is supposed to be moved to. That is, when tape loading is performed, the left side swing guide 25 is positioned so as to be close to the left side tilt guide post 19 from the left side thereof, and the right side swing guide 26 is located on the right side of the right side tilt guide post 20. Will be located close to each other.

Reference numeral 27 denotes a fixed guide post that is erected 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 completion position.

Reference numeral 28 denotes a capstan, which is arranged at a position slightly distant from the right-side feed guide 26 at the loading completion position in the mechanical chassis 16 and is illustrated when recording or reproducing is performed. Not to be rotated by a capstan motor.

Reference numeral 29 is a pinch roller, and 30 is a ten-legged pin. These pinch rollers 29 and ten-legged pin 30 are in positions before the tape loading is performed, which are indicated by chain double-dashed lines in FIG. )
When the tape is loaded, the tape is moved to the position shown by the solid line in FIG. 1 (hereinafter referred to as the "loading completion position").

(C. Mounting of tape cassette) Therefore, when recording or reproducing the contents recorded on the magnetic tape 12, first, the tape cassette 1 is used.
To the specified cassette mounting position of VTR13. This mounting is performed as follows by a 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 lid 3 thereof 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 moved forward with respect to the head drum 17, and substantially in the center of the portion of the magnetic tape 12 located on the tape pull-out surface of the cassette case 2. The portion is pressed against the upper end of a portion of the outer peripheral surface of the head drum 17 which is positioned substantially forward. In this state, the front end of the head drum 17 is relatively positioned inside the front cover 3 which is in the open position, and the portion of the magnetic tape 12 that is led out of the cassette case 2 is shown in FIG. Will be passed through the path indicated by the chain double-dashed line.

Therefore, the cassette holding member is moved downward from this state. As a result, the tape cassette 1 is mounted at the predetermined cassette mounting position on the VTR 13. The tape cassette 1 is positioned with respect to the VTR 13 by cassette positioning means (not shown) provided in the mechanical chassis 16.

And together with this, the reel hub of the tape reels 9 and 10
Reel bases 14, in engagement holes (not shown) formed in 11 and 11 ',
Fifteen reel engaging shafts (not shown) are relatively engaged, so that the S reel 9 and the left reel base 14 are connected to the T reel.
10 and the reel stand 15 on the right side are in a state of being respectively integrally rotated.

Incidentally, the portion of the magnetic tape 12 that has been led out of the cassette case 2 is moved downward so that the substantially central portion of the magnetic tape 12 passes over the outer peripheral surface of the head drum 17 while passing through the path described above. When 1 is mounted in the cassette mounting position, it is positioned in contact with the substantially central portion of the head drum 17 in the height direction.

(D. Tape loading) When the tape cassette 1 is mounted at the cassette mounting position of the VTR 13, the guide rollers 21 and 2 provided on the VTR 13 side.
2, the feeding guides 25 and 26, the pinch roller 29, and the ten pin pin 30 are all relatively positioned in the tape pull-out concave portion 4 formed in the cassette case 2.

Then, when an instruction to load the tape is issued, the guide rollers 21, 22, the feeding guides 25, 26, the pinch roller 29, and the ten-legged pin 30 are respectively moved to the loading completion position. And pinch roller
29 is magnetic tape 12 and is crimped to capstan 28,
The balance pin 30 comes near the front side of the fixed guide post 27.

(E. Tape path when tape loading is completed)
[FIG. 1] When the tape loading is completed, the portion of the magnetic tape 12 pulled out from 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 the S reel 9
Is pulled out from the cassette case 2 through the tape outlet 5 on the left side of the cassette case 2, and the tension pin 30-the fixed guide post 27-the left side ejection guide 25-
The left tilted guide post 19 is wound around the left guide roller 21 in this order, then is wound around the head drum 17, and after the winding around the head drum 17 is completed, the right guide roller 22- The right tilt guide post 20-the right swing guide 26-the capstan 28 is wound in this order, and is introduced into the cassette case 2 from the tape outlet 6 on the right side of the cassette case 2 and wound on the T reel 10. Will be passed through.

Then, in the state where 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, 20 is regulated by the guide rollers 21, 22. Will be.

Then, in this state, the magnetic tape 12 is wound around the head drum 17 at a winding angle of approximately 221 °.

In this tape pass, the magnetic tape 12 is wound around the left tilted guide post 19 and the right tilted guide post 20 by approximately 53 °, respectively, and is also wound around the left guide roller 21 and the right guide roller 22. On the other hand, they are wound around 120 °. Also, the winding start position for the head drum 17 and the left guide roller 21
And the path length between the winding end position for the head drum 17 and the right guide roller 22 are about 8 mm.

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 and the right inclined guide post 20 and the right guide roller 22.
The twist angle in the path between and is approximately -10 °.
Has become.

(F. Running of Tape) Therefore, recording or reproduction is performed by running the magnetic tape 12 in a state where the magnetic tape 12 passes through the tape path and rotating a predetermined rotating portion of the head drum 17.

The running of the magnetic tape 12 is performed by the capstan 28 that is rotated at a constant speed in the counterclockwise direction and the pinch roller 29 that is pressed against the capstan 28.

Therefore, the magnetic tape 12 is pulled out from the S reel 9 and wound around the T reel 10.

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

Since the guide rollers 21 and 22 are provided in an inclined state, the portion of the running magnetic tape 12 wound around it is attached so as to move in the width direction of the tape over the outer peripheral surface. However, such movement is caused by the flanges 23, 23 provided on the guide rollers 21 and 22.
And 24, 24 will be blocked.

(G. Effects of the Invention) As is apparent from the above description, the tape recorder of the present invention is a tape in which a tape reel around which a magnetic tape is wound is housed and which is provided with a front lid for opening and closing the tape pulling surface. A head drum is provided which is equipped with a cassette and which is provided with a rotary magnetic head and whose axial direction is inclined at a predetermined angle with respect to the axial direction of the tape reel. The magnetic tape is a portion pulled out from the tape cassette. A part of is wound around the head drum at a predetermined wrapping angle, and is attached to a predetermined mechanical chassis immediately before the position where the winding on the head drum is started and immediately before the position where the winding is finished. A tape that is loaded so that it passes through a tape path that is wound from the front on a fixedly installed inclined guide post. A coder between the inclined guide post on the winding start position side of the magnetic tape and the inclined guide post on the winding end position side of the magnetic tape with respect to the head drum at least in a state where the loading of the magnetic tape is completed. The tape path is regulated by a guide roller with a flange.

That is, in the present invention, a portion of the magnetic tape immediately before the winding start position with respect to the head drum and a portion immediately after the winding end position with respect to the head drum, that is, as the tape winding angle with respect to the head drum increases, the magnetic tape bends at a larger angle. The portion that needs to be wound is wound around a guide roller that does not give a large load to the running of the tape.

Therefore, according to the present invention, even if the tape wrapping angle with respect to the guide roller is large, this does not give a large load to the running of the tape, and therefore, the predetermined guide member in the two portions of the magnetic tape is used. The tape wrap angle with respect to the head drum can be selected without considering the size of the wrap angle.

Moreover, according to the present invention, since the inclined guide post is fixedly provided to the predetermined chassis, the inclination direction is always kept constant once it is adjusted with high accuracy. Further, in this way, since the tilt guide post whose orientation is a problem can be fixedly provided, the tilt guide post positioning mechanism provided in the conventional VTR or the like can be omitted, and the VTR can be omitted accordingly. The mechanism such as can be simplified.

Therefore, according to the present invention, even if the tape winding angle with respect to the head drum is increased, it is not necessary to increase the inclination angle of the head drum, so that the diameter of the head drum can be made smaller and its height Therefore, it is possible to mount the tape cassette inside the front lid provided on the tape cassette with a part of the head drum positioned.

It should be noted that the specific values of the diameter of the head drum and the tape winding angle with respect to the head drum described in the above embodiment do not limit the dimensions of each part of the tape recorder to which the present invention is applied.

[Brief description of drawings]

1 to 3 show an example in which the tape recorder of the present invention is applied to a video tape recorder. FIG. 1 is a plan view showing a state in which a tape cassette is mounted, and FIG. 2 is a sectional view taken along line II-II of FIG. 3, FIG. 3 is a side view of an essential part, FIG. 4 is a plan view showing an example of a conventional video tape recorder with a tape cassette mounted, and FIG. 5 is a head drum. 5 is a graph showing a correlation between a tape wrap angle with respect to and a tape wrap angle with respect to an inclined guide post. Explanation of symbols 1 ... Tape cassette, 3 ... Front lid, 9, 10 ... Tape reel, 12 ... Magnetic tape, 13 ... Tape recorder, 16 ... Mechanical chassis, 17 ... Head drum, 19, 20 ...
… Inclined guide posts, 21, 22 …… Guide rollers, 23,
24 …… Flange

Claims (1)

[Claims] 1. A tape cassette in which a tape reel wound with a magnetic tape is housed and a front lid for opening and closing a tape pull-out surface is mounted, a rotary magnetic head is provided, and the tape reel has an axial direction. A head drum is provided which is inclined at a predetermined angle with respect to the axial direction of the head drum, and a part of the magnetic tape pulled out from the tape cassette is wound around the head drum at a predetermined winding angle and the head drum. At a position immediately before the position where the winding is started and a position immediately before the position where the winding is finished, the tape path that is wound from the front is passed through the inclined guide posts fixedly provided on the predetermined mechanical chassis. A tape recorder that is loaded so that at least the loading of the magnetic tape has been completed In this state, the tape path between the inclined guide post on the winding start position side and the inclined guide post on the winding end position side of the magnetic tape with respect to the head drum is regulated by a guide roller with a flange. Tape recorder characterized by