JPH0973695A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately maintain a relationship of a relative position between a magnetic tape and a body of rotation to rotate with mounted magnetic heads in the widthwise direction of the magnetic tape. SOLUTION: In the device, the rotation body 2 having a rotation shaft P in the orthogonal direction to the surface of the magnetic tape 1 housed in a tape cassette 50 provided with a tape guide 55 having one pair of flanges 63 and 66 is fitted with the magnetic heads 4, which are then brought into sliding contact with the magnetic tape 1 to perform recording and reproducing in forming circular-arcuate recording tracks. Then, the rotation body 2 is so constituted that projection-like members 22 and 23 provided substantially integrally with the rotation body 2 are engaged with and abutted on the flanges 63 and 66.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording in which a magnetic head is attached to a rotating body having a rotation axis in a direction substantially perpendicular to the surface of a magnetic tape, and the magnetic tape is slidably contacted to form an arc-shaped track pattern for reproduction. Reproduction device

[0002]

2. Description of the Related Art FIG. 1 is a conceptual diagram of a magnetic recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 6-139662. In FIG. 1, reference numeral 1 is a magnetic tape, 2 is a rotating body having a rotation axis substantially orthogonal to the magnetic tape surface, and 3 is a motor for rotationally driving the rotating body 2. The magnetic heads 4a, 4b
. Are attached to these magnetic heads 4a, 4b ...
The recording and reproduction are performed by slidingly contacting the magnetic tape 1. The arrow 5 indicates the magnetic tape running direction, and 6 and 7 are tape guides that guide the magnetic tape 1 by regulating the position of the magnetic tape 1 in the width direction. This recording method is characterized in that it does not require a so-called loading mechanism or the like for winding a magnetic tape around a drum, which is adopted in a general helical scan type VTR, and the structure of the apparatus is simplified. .

FIG. 2 shows an example of a track pattern formed on the magnetic tape 1 by the magnetic recording / reproducing apparatus shown in FIG. As shown in the figure, the track pattern 8 is formed in an arc shape. At this time, the form of the track pattern 8 is the track width TRW1 of the magnetic heads 4a, 4b ..., The number of the magnetic heads 4a, 4b ... Attached to the rotor 2, the number of revolutions of the rotor 2, the transfer of the magnetic tape 1. Determined by specifications such as speed. In the example of FIG. 2, the track patterns 8 having the track width TRW1 are sequentially formed by being separated by the guard band 9 that does not record a signal, but the guard band 9 can be eliminated by setting the above specifications.
In such a case, it is also effective to make adjacent tracks different in azimuth angle in order to reduce crosstalk between adjacent track patterns 8. It should be noted that the track pattern shown in FIG. 2 is a schematic representation, and the track width TRW1 is displayed in an enlarged manner than it actually is.

Now, regarding the positional accuracy in the width direction of the magnetic tape 1 required when reproducing the magnetic tape 1 of FIG. 2 with the magnetic recording / reproducing apparatus of FIG. 1, a so-called helical scan generally used in VTRs and the like is used. Description will be made in comparison with a magnetic recording / reproducing apparatus of the type. FIG. 3 is a plan view schematically showing a main part of a general magnetic recording / reproducing apparatus of the helical scan type. The magnetic tape 10 is recorded on the side surfaces of the rotating upper drum 11 and fixed drum 12 on which a magnetic head (not shown) is mounted and which is obliquely and cylindrically wound. This time,
The magnetic tape 10 has a structure in which a lower end edge of the magnetic tape 10 is regulated and guided by a lead 13 provided on a fixed drum 12 so that a predetermined track pattern 14 can be recorded. In order to accurately scan the track pattern 14 by this method with the magnetic head during reproduction, it is necessary to control the running speed and position of the magnetic tape 10. This helical scan type track pattern 14 is shown in FIG. The inclination θ2 of the track pattern recorded on the magnetic tape 10 is, for example, VH
In the S (registered trademark) type VTR, it is about 6 degrees,
Track width TRW2 in EP mode of VHS system is 19
μm.

In reproducing the track pattern 14 of the helical scan type as described above, considering the case where the inclination angle θ2 of the track pattern 14 is about 6 degrees, a deviation of 10 μm in the width direction of the magnetic tape 10 is caused by the magnetic tape. It can be said that there is almost no problem because the magnetic head can accurately scan the track pattern 14 by controlling the position of 10 in the traveling direction by moving it by about 100 μm. On the other hand, when the magnetic tape 1 shown in FIG. 2 is reproduced by the magnetic recording / reproducing apparatus shown in FIG. 1, the track pattern 8 is an arc substantially perpendicular to the longitudinal direction of the magnetic tape. The control of the traveling speed and the position in the direction is not sufficient, and the position control in the width direction of the magnetic tape 1 is required to be more precise than in the case of the helical scan method.

Now, let us consider a case of reproducing an arcuate track pattern 8 having a track width TRW1 as shown in FIG. If the angle at which the magnetic heads 4a, 4b, ... Contact the track pattern 8 is a contact angle .theta.1, the track deviation occurs when the magnetic tape 1 deviates from its original position in the tape width direction by d (not shown). The amount ΔTRW1 is represented by ΔTRW1 = d · sin (θ1 / 2). Here, θ1 = 90 degrees, TRW1 = 19 μm
When d is 10 μm, ΔTRW1 = 7 μm, and the effective track width is greatly reduced to 12 μm. The reduction of the effective track width cannot be corrected by controlling the position of the magnetic tape 1 in the running direction like the VTR of the helical scan system described above.

In order to prevent the reduction of the effective track width, a method of moving the rotating body 2 by a deviated amount or a correction by moving the entire tape cassette (not shown) accommodating the magnetic tape 1 can be considered. An example of this is the magnetic recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 7-98828. FIG. 5 shows a configuration diagram of the main part thereof. In this magnetic recording / reproducing apparatus, tracking servo is performed by a motor 15 or the like, the rotating body 2 having the magnetic heads 4a, 4b, ... Mounted on a holder 17 having a rotating shaft 16, and a screw 18 is attached by the motor 15. It rotates to control the position of the rotating body 2.

[0008]

As described above, in the magnetic recording / reproducing apparatus of FIG. 1 in which an arc-shaped track pattern is formed for recording / reproducing, a loading mechanism is not required, and the mechanism can be simplified and the apparatus is inexpensive. However, more precise tape running performance is required in the tape width direction. As a means for solving this problem, Japanese Patent Laid-Open No. 7-98828
Although it is possible to adopt a tracking servo like the magnetic recording / reproducing apparatus disclosed in Japanese Patent Publication No. JP-A-2003-264, it requires a complicated mechanism and a servo signal system, which makes the apparatus complicated and expensive.

[0009]

The present invention has been made in view of such problems, and the invention according to claim 1 is
"A magnetic recording / reproducing apparatus in which a magnetic head is attached to a rotating body having a rotation axis in a direction substantially perpendicular to the surface of the magnetic tape, and the magnetic head is slidably contacted with the magnetic tape to form an arc-shaped track pattern for recording / reproducing. A first edge for restricting one edge of the magnetic tape to be arranged substantially symmetrically with respect to the rotation axis of the rotating body in the vicinity of both sides of the rotating body while being loaded in the magnetic recording / reproducing apparatus. A tape guide having at least one flange and a second flange for regulating the other edge of the magnetic tape, and the tape is subjected to shear strain in the width direction of the magnetic tape under the action of a predetermined tension. In order to provide the above-mentioned magnetic field, the gap between the first flange and the second flange in the width direction of the magnetic tape is set to be smaller than the minimum value of the width-direction dimension that the magnetic tape can take within its tolerance. For recording / playback devices In the magnetic recording / reproducing apparatus using a removable tape cassette, first position regulating means for regulating the relative position of the first flange with respect to the rotating body in the width direction of the magnetic tape and the second flange. A magnetic recording / reproducing device characterized in that a second position regulating means for regulating the relative position of the magnetic tape in the width direction with respect to the rotating body is provided substantially integrally with the rotating body. " Yes,

According to a second aspect of the present invention, "the first position restricting means and the second position restricting means are provided in the vicinity of both sides of the rotating body substantially symmetrically with respect to the rotating shaft of the rotating body. A first reference surface and a second reference surface, and the first reference surface, the second reference surface, and the rotating body are integrally biased to rotate about the rotation axis of the rotating body. Urging means for activating the first means by the urging means.
Of the reference plane, the second reference plane, and the rotating body about the rotational urging direction of the rotating body about the rotation axis, the tape cassette is loaded into the magnetic recording / reproducing apparatus, and recording or 2. The direction according to claim 1, wherein the first reference surface is in contact with the first flange and the second reference surface is in contact with the second flange in such a manner that reproduction can be performed. Magnetic recording / reproducing device. "

According to a third aspect of the present invention, "the tape cassette is moved in the direction of substantially the rotation axis of the rotating body and the tape cassette is loaded in the magnetic recording / reproducing apparatus in such a manner that recording or reproduction can be performed. At this time, the first reference surface and the second reference surface are guided so as to contact the first flange and the second flange, respectively, against the rotational biasing force of the biasing means. 3. The magnetic recording / reproducing apparatus according to claim 2, wherein an inclined surface or an R surface is provided on the first reference surface and the second reference surface or the first flange and the second flange. " It is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention mechanically realizes precise positioning in the tape width direction. Embodiments of the present invention will be described below with reference to FIGS. 6 to 9. 6 and 7 are perspective views showing a magnetic recording / reproducing apparatus of the present invention and a tape cassette used in the magnetic recording / reproducing apparatus of the present invention together. FIG. 8 is a front view showing the configuration of the rotating body 2 of FIG. 6 or 7 and its surroundings, and FIG. 9 shows the shear deformation occurring in the magnetic tape when a predetermined tension acts in the tape cassette. It is a figure explaining.

First, the tape cassette 50 used in the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. 6, 7 and 9. In FIG. 6 or 7, reference numeral 51 denotes a housing of the tape cassette 50, and inside thereof, a pair of reels 52 and 53 around which the magnetic tape 1 is wound, a guide roller 54 for guiding the magnetic tape 1, and a tape guide. 55,
A drive belt 5 that comes into contact with the magnetic tape 1 wound around the reels 52 and 53 to drive the reels 52 and 53 to rotate.
6. Drive belt 5 driven by a capstan (not shown)
A drive roller 57 for driving the drive roller 6, a guide roller 58, 59 for guiding the drive belt 56, and the like are provided. That is, when the tape cassette 50 is loaded in the magnetic recording / reproducing apparatus of the present invention, the drive roller 57 contacts the capstan (not shown) of the apparatus and rotates. As a result, the drive belt 56 stretched around the drive roller 57 and the guide rollers 58 and 59 with a predetermined tension comes into contact with the outer periphery of the magnetic tape 1 wound around the reels 52 and 53, and the magnetic tape 1
Run.

Next, the structure and operation of the tape guide 55 will be described in more detail with reference to FIG. 9A is a perspective view showing the tape guide 55 of the tape cassette 50 taken out, and FIG. 9B is a front view thereof. The tape guide 55 is configured with a pair of sliding contact guide surfaces 60 and 61 that are in sliding contact with the surface of the magnetic tape 1, a step portion 62 lower than these sliding contact guide surfaces 60 and 61, and above and below the sliding contact guide surface 60. Flanges 63, 64 and the sliding contact guide surface 6
1 and the flanges 65 and 66 that are formed above and below. The tape guide 55 is fixed in the housing 51 of the tape cassette 50, and when the tape cassette 50 is loaded into the magnetic recording / reproducing apparatus of the present invention in a recordable or reproducible state, the tape guide 55 is formed.
The magnetic heads 4a and 4b slidably contact the magnetic tape 1 stretched over the stepped portion 62 to form an arc-shaped track pattern 8 for recording or reproduction.

Here, as shown in FIG. 9, consider an xyz coordinate system having a point O as an origin. The x-axis and the z-axis are axes that are on the same plane as the sliding contact guide surfaces 60 and 61 and are orthogonal to each other. Further, the y-axis is an axis orthogonal to the x-axis and the z-axis. The origin O is a line segment A connecting the inner end surface 63a of the flange 63 and the inner end surface 66a of the flange 66 in FIG.
It is taken to match the midpoint of B.

The size TW1 of the flange 63 and the flange 66 in the z-axis direction is set to be smaller than the minimum value of the widthwise size that the magnetic tape 1 can have within its allowable tolerance. The z-axis dimension of the flange 63 and the flange 64 and the z-axis dimension of the flange 65 and the flange 66 are
The magnetic tape 1 is set to be larger than the maximum value of the widthwise dimension that can be taken within the allowable tolerance. Therefore, when the magnetic tape 1 is applied with a tension T that does not cause buckling, the magnetic tape 1 is sheared and deformed. Then, in such a state, the upper edge portion 1a of the magnetic tape 1 is
Contacts the flange 63, the lower edge 1b contacts the flange 66, and does not contact the flange 64 and the flange 65. The width dimension of the magnetic tape 1 generally varies within the tolerance, but the tape guide 55 as described above is used.
According to, even if the width of the magnetic tape 1 varies,
The center of the magnetic tape 1 in the width direction can always be substantially aligned with the origin O.

Next, as an example, let us consider specific values on the assumption that a VHS standard magnetic tape is adopted for the tape cassette 50 having the tape guide 55.
In FIG. 9, the distance between the flange 63 and the flange 66 in the z-axis direction is TW1, the width of the magnetic tape 1 running in the x-axis direction is TW0, and there is a relationship of TW0 = TW1 + ΔTW1. At this time, assuming that the distance between the flange 63 and the flange 66 in the x-axis direction is L1, the magnetic tape 1
The shear strain of is represented by γ = ΔTW1 / L1. The tension T gives an appropriate value so that buckling does not occur in the magnetic tape 1. It is desirable that the shear strain γ be smaller than the elastic limit range.

Since the standard of the widthwise dimension of the VHS tape is 12.65 ± 0.01 mm, its maximum value TW
The max and the minimum value TWmin are TWmax = 12.66 mm and TWmin = 12.64 mm, respectively. Therefore, TW1 = 12.63 mm and L1 =
When set to 20 mm, the shear strains are γmax = (TWmax-Tw1) / L1 γmin = (TWmin-Tw1) / L1, respectively, so γmax = 0.1% and γmin = 0.05.
%. The thickness of the magnetic tape 1 is 0.018 mm,
When the Young's modulus is 7 × 10 ⁵ grf / mm ² , the force with which the magnetic tape 1 is pressed against the flanges 63 and 66 is about 12 to 25 grf. Magnetic tape 1 by this force
Is restricted. The amount of shear strain is 1
It is possible to set an appropriate value depending on the width and thickness.
Generally, in a plastic member, a shear strain of 0.2% or less is within the elastic limit and has almost no effect on the magnetic tape 1. Here, it is understood that the center of the magnetic tape 1 in the width direction always coincides with the origin O, and is not affected by the variation in the width dimension of the magnetic tape 1.

Now, the tape cassette 50 described above
An embodiment of a magnetic recording / reproducing apparatus of the present invention using the above will be described below with reference to FIGS. 6 to 8. In FIGS. 6 to 8, reference numeral 2 denotes a rotating body, on which the magnetic heads 4a and 4b are mounted. Reference numeral 19 denotes a housing of a motor (not shown) that rotationally drives the rotating body 2, and brackets 20 and 21 are fixed to the housing 19.
Protrusion-shaped members 22 and 23 are attached via 0 and 21. A head support 24 is screwed to the chassis 25. On the head support 24, a pair of leaf springs 26 and 27, a pair of columns 30 and 31, and a pair of leaf springs 2 are provided.
8, 29 and a pair of arms 32, 33 are provided on both sides of the housing 19, respectively. That is, the leaf spring 26
The column 30, the leaf spring 27, and the column 31 are fastened to the head support 24 together from the bottom surface side of the head support 24 with screws (not shown). Also, the columns 30, 31
A leaf spring 28 and an arm 32, and a leaf spring 29 and an arm 33 are fastened together at their upper ends by screws 34 and 35, respectively.

The bracket 20 is inserted between the leaf spring 26 and the leaf spring 28, and the leaf spring 26 and the leaf spring 2 are inserted.
It is attached with screws 34 and 35 at the respective tip portions of 8.
Similarly, the bracket 21 is inserted between the plate spring 27 and the plate spring 29, and attached at the tip ends of the plate spring 27 and the plate spring 29 with screws 36 and 37. Further, a push screw 38 is provided at the tip of the arm 32, and the tip of the push screw 38 abuts on the substantially central portion of the leaf spring 28, so that the leaf spring 28
Is curved slightly downward. On the other hand, a pulling screw 39 is provided at the tip of the arm 33, and a collar 39a provided at the tip of the leaf spring 29 penetrates the substantially central portion of the leaf spring 29.
The leaf spring 29 is curved slightly upward. That is, with such a configuration, the rotating body 2, the housing 19, the brackets 20 and 21, and the projecting members 22 and 23 are biased to rotate counterclockwise in FIG. 6 around the rotation axis P of the rotating body 2. The leaf springs 26, 27, 28, 2 are twisted in a slightly twisted state.
It is in a suspended state by 9.

FIG. 8 is a view of the rotating body 2 and the housing 19 as seen from the direction of the rotating shaft. Projecting members 22, 23
The end faces 22a and 23a of are set at positions substantially symmetrical to the rotation axis P. Further, the tip of the end surface 22a of the projecting member 22 and the tip of the end surface 23a of the projecting member 23 are
Slopes 22b and 23b (or R surfaces 22b and 23, respectively)
b) is formed, and the tape guide 55 when the tape cassette 50 is loaded into the apparatus will be described as follows.
The projections 22 and 23 are easily fitted to each other.

In FIG. 6 or 7, the tape cassette 50 is
The magnetic heads 4a and 4b are brought into contact with the magnetic tape 1 by being guided by a guide mechanism of a device (not shown) to move to the arrow 40, and a state where recording and reproduction are possible is achieved. When the tape guide 55 approaches the projecting members 22 and 23 during this movement of the tape cassette 50, the lower edge of the flange 63 and the lower edge of the flange 66 of the tape guide 55 are first inclined surfaces 23b and 22b, respectively. Abut. If the tape cassette 50 moves further in the same direction from this state,
The protruding members 22 and 23, and the brackets 20 and 21, the housing 19 and the rotating body 2 which are substantially integrated with the protruding members resist the rotational biasing force of the leaf springs 26, 27, 28 and 29. By rotating in the clockwise direction as a whole, the end faces 22a and 23a are brought into a state of being pressed against and fitted to the flanges 66 and 63, respectively.

As a result, the tape guide 55 and the rotating body 2
The relative position in the z-axis direction (the width direction of the magnetic tape) can be accurately and uniquely determined. Therefore, the z-axis direction of the magnetic tape 1 and the rotating body 2 guided by the tape guide 55 is also uniquely determined. This is because, as described above, the magnetic tape 1 is subjected to a slight shearing deformation, and the flanges 63 and 66 regulate the position of the magnetic tape in the width direction with respect to the tape guide 55. In addition,
Here, the sloped surfaces 22b and 23 are formed on the projecting members 22 and 23.
Although the b (or the R surfaces 22b and 23b) are formed, they may be formed on the lower edge portions of the flanges 63 and 66 of the tape guide 55, or may be formed on both of them.

In the above description, the rotary body 2, the projecting members 22, 23, etc. are biased counterclockwise in FIG. 6 by the leaf springs 26, 27, 28, 29, etc. Although described as an example, the present invention is not limited to this, and may be configured so as to be biased to rotate in the clockwise direction. In that case, it goes without saying that the flanges 63, 64, 65, 66 in the tape guide 55 of the tape cassette 50 used in the apparatus should be provided rotationally symmetrically at the origin O. Further, although the magnetic recording / reproducing apparatus having both the recording function and the reproducing function has been described above, the present invention can be applied to a magnetic recording apparatus having only the recording function or a magnetic reproducing apparatus having only the reproducing function. Needless to say.

[0025]

As described above, the arc recording method has a drawback that the tracking characteristic is deteriorated due to the dimensional error in the width direction of the magnetic tape and the positional accuracy thereof. However, according to the present invention, the size of the magnetic tape width is reduced. It is possible to maintain the relative positional relationship between the rotating body and the magnetic tape in the magnetic tape width direction mechanically with extremely high accuracy, with little influence of the error. Therefore, a simple and low-cost magnetic recording / reproducing apparatus can be realized without having a complicated tracking control mechanism in the width direction of the magnetic tape.

[Brief description of drawings]

FIG. 1 is disclosed in Japanese Patent Laid-Open No. 6-139662.
The perspective view of a magnetic recording / reproducing apparatus.

FIG. 2 is a diagram showing a track pattern of magnetic tape-shaped circular arc recording.

FIG. 3 is a plan view showing a main part of a helical scan type magnetic recording / reproducing apparatus.

FIG. 4 is a diagram showing a track pattern recorded in a magnetic tape shape by recording in a helical scan method.

FIG. 5 is a configuration diagram of a main part of a magnetic recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 7-98828.

FIG. 6 is a perspective view showing the magnetic recording / reproducing apparatus of the present invention and a tape cassette used in the magnetic recording / reproducing apparatus of the present invention together.

FIG. 7 is a perspective view showing the magnetic recording / reproducing apparatus of the present invention and a tape cassette used in the magnetic recording / reproducing apparatus of the present invention together.

FIG. 8 is a front view of the vicinity of a rotating body of the magnetic recording / reproducing apparatus of the present invention.

FIG. 9 is a view for explaining the structure of a tape guide and shear deformation that occurs in the magnetic tape.

[Explanation of symbols]

 1 Magnetic Tape 2 Rotating Body 3 Motor 4 Magnetic Head 6 Tape Guide 7 Tape Guide 8 Track Pattern 9 Guard Band 10 Magnetic Tape 11 Upper Drum 12 Fixed Drum 13 Lead 14 Track Pattern 15 Motor 16 Rotating Shaft 17 Holder 19 Housing 20 Bracket 21 Bracket 22 Projecting member 23 Projecting member 24 Head support 25 Chassis 26 Leaf spring 27 Leaf spring 28 Leaf spring 29 Leaf spring 30 Pillar 31 Pillar 32 Arm 33 Arm 38 Push screw 39 Pull screw 50 Tape cassette 51 Housing 52 Reel 53 Reel 54 Guide roller 55 Tape guide 56 Drive belt 57 Drive roller 58 Guide roller 59 Guide roller 60 Sliding contact guide surface 61 Sliding contact guide surface 62 Step portion 63 Flange 64 flange Nji 65 flange 66 flange

Claims (3)

[Claims] 1. A magnetic head is attached to a rotating body having a rotation axis in a direction substantially orthogonal to a magnetic tape surface, and the magnetic head is slidably contacted with the magnetic tape to form an arc-shaped track pattern for recording and reproduction. A magnetic recording / reproducing apparatus, wherein one edge portion of the magnetic tape to be arranged substantially symmetrically with respect to the rotation axis of the rotating body in the vicinity of both sides of the rotating body while being mounted in the magnetic recording / reproducing apparatus. At least a tape guide having a regulating first flange and a second flange regulating the other edge of the magnetic tape, the width of the magnetic tape being applied to the magnetic tape under the action of a predetermined tension. The width of the magnetic tape between the first flange and the second flange in the width direction is set to be smaller than the minimum value of the width dimension that the magnetic tape can have within its allowable tolerance in order to give a shear strain in the direction. The magnetic recording / reproducing device In the magnetic recording / reproducing apparatus that uses a tape cassette that can be attached to and detached from an apparatus, first position regulating means for regulating the relative position of the first flange in the width direction of the magnetic tape with respect to the rotating body, and the second position regulating means.
2. A magnetic recording / reproducing apparatus, wherein a second position regulating means for regulating the relative position of the flange of the magnetic tape in the width direction of the magnetic tape with respect to the rotating body is provided substantially integrally with the rotating body. 2. A first reference surface provided with the first position restricting means and the second position restricting means in the vicinity of both sides of the rotating body substantially symmetrically with the rotating shaft of the rotating body. A second reference surface, and urging means for integrally urging the first reference surface, the second reference surface, and the rotating body to rotate around the rotation axis of the rotating body, The direction of the rotational biasing of the first reference surface, the second reference surface, and the rotary body around the rotary shaft of the rotary body by the biasing means is such that the tape cassette can perform the magnetic recording. It is a direction in which the first reference surface abuts on the first flange and the second reference surface abuts on the second flange in such a manner that recording or reproduction can be performed by being loaded in a reproducing apparatus. Claim 1 characterized by
The magnetic recording / reproducing apparatus described. 3. When the tape cassette is moved substantially in the direction of the rotation axis of the rotating body to load the tape cassette in the magnetic recording / reproducing apparatus in a manner capable of recording or reproducing, the urging means is used. An inclined surface or an R surface that guides the first reference surface and the second reference surface to abut against the first flange and the second flange against the rotational biasing force, respectively. The magnetic recording / reproducing apparatus according to claim 2, wherein the magnetic recording / reproducing apparatus is provided on one reference surface and the second reference surface or on the first flange and the second flange.