JPH041418B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a magnetic recording and reproducing device that wraps a magnetic tape around a helical scan guide drum over a range of 180 degrees or more, and is particularly capable of being made smaller and thinner. The present invention relates to a magnetic recording/reproducing device.

Conventional technology Currently, home video tape recorders (hereinafter referred to as
In order to make the VTR (VTR) more compact and recordable,
A loading method in which magnetic tape is wrapped around a guide drum over a range of more than 180 degrees (for example, 8
millivideo) has been proposed.

In addition, conventionally, magnetic tape was used as a guide drum for approximately 180 mm.
There are two main types of loading methods: parallel loading and U loading.

As shown in FIGS. 3A and 3B, the parallel loading 1 involves loading the magnetic tape 4 (in the direction of the arrow in the figure) against a guide drum 3 that is attached to the substrate 2 at an angle of inclination α1 in the direction of the arrow S1 in the figure. There are guide posts 5a symmetrically on the entry side and exit side of the vehicle (traveling), respectively.
5b and inclined posts 6a, 6b.

Further, as shown in FIGS. 4A and 4B, the U loading 7 tilts the guide drum 3 in the direction in which the magnetic tape 4 is removed (direction indicated by arrow S2 in the figure) at an angle α2 (γ=α2) equal to the lead angle γ. The magnetic tape 4 is configured to allow either the entrance side or the withdrawal side (for example, the withdrawal side) of the magnetic tape 4 to leave the guide drum 3 in a horizontal direction with respect to the substrate 2.
In this loading method, the angle at which the magnetic tape 4 enters the guide drum 3 is approximately twice the lead angle γ with respect to the substrate 2, and the guide roller 8 for pulling out is located at a considerably high position.

Problems to be Solved by the Invention However, in the above-mentioned parallel loading 1, when the winding angle λ1 of the magnetic tape 4 on the guide drum 3 is increased (180 degrees or more), the inclination angle α1 of the guide drum 3 and Inclined posts 6a, 6b
The winding angle θ of the magnetic tape 4 at both increases. Therefore, in parallel loading 1, if the winding angle of the magnetic tape 4 is increased, the guide drum 3
Since the inclination angle α1 becomes large, the height of the guide drum 3 relative to the substrate 2 (indicated by arrow H1 in the figure) becomes large, resulting in a disadvantage that the magnetic recording/reproducing device cannot be made thinner. Furthermore, since the winding angle θ of the magnetic tape 4 on the inclined posts 6a, 6b becomes large, a large frictional force is generated between the magnetic tape 4 and the inclined posts 6a, 6b, resulting in a large tape running load and stable running of the magnetic tape 4. The disadvantage is that it is hindered.

In addition, when the winding angle λ2 of the magnetic tape 4 on the guide drum 3 is increased (180 degrees or more) in the U loading 7, the guide roller 8 must be provided at a position farther from the guide drum 3, and the magnetic tape 4 The disadvantage is that the area required for loading is large, and miniaturization is not possible. Along with this, the height of the guide roller 8 with respect to the substrate 2 (H in the figure)
2) becomes large, and there is a drawback that it is not possible to reduce the thickness. Furthermore, since the height position of the magnetic tape when it is pulled out from the tape cassette (not shown) with respect to the substrate 2 and the height position at which the magnetic tape 4 enters the guide drum 3 are significantly different, the difference in height is The magnetic tape 4 must be moved upward,
For this reason, the running path of the magnetic tape 4 becomes long, and therefore a large area is required for loading the magnetic tape 4, which also has the drawback of hindering miniaturization.

Therefore, in the present invention, the magnetic tape, which has been raised in stages by a plurality of first inclined posts, enters the guide drum which is inclined in a direction perpendicular to the direction in which the magnetic tape is removed from the entry position. By using the second inclined post to guide the magnetic tape to a horizontal running position and release it, the magnetic tape can be moved especially to the guide drum.
An object of the present invention is to provide a magnetic recording/reproducing device which adopts a loading method of winding over 180 degrees and can be made smaller and thinner.

Means for Solving the Problems In order to solve the above problems, the apparatus of the present invention uses the following means. As shown in Figure 1 A and B,
A guide drum 11 is mounted on a substrate 10 vertically holding a reel stand (not shown in FIG. 1) on which a magnetic tape 9 is wound, in a direction perpendicular to the direction in which the magnetic tape 9 is removed (indicated by arrow S3 in the figure). (direction shown).

Also, the magnetic tape 9 on the outer periphery of this guide drum 11
A plurality (for example, two) of first inclined posts 12 and 13 are provided near the entry position (indicated by symbol A in the figure).

Further, a second inclined post 14 is provided near the detachment position of the magnetic tape 9 (indicated by symbol B in the figure) on the outer periphery of the guide drum 11.

Therefore, the magnetic tape 9 is given a relatively large inclination in the tape surface direction by the first inclined post 12 from the horizontal running position, and the inclination in the tape surface direction is alleviated by the next first inclined post 13. The guide drum 11 moves upward to the entry position A, and is guided by the second inclined post 14 to the horizontal traveling position.

By tilting the guide drum 11 with respect to the direction in which the magnetic tape 9 is released, the magnetic tape 9 wound spirally around the guide drum 11 is rotated 180 degrees from the release position B opposite to the running direction. The portion wound in the direction (the portion from symbol B to symbol C in FIG. 1) has a substantially constant relative height with respect to the substrate 10, and forms a tape path substantially parallel to the substrate surface.

In general, when running a tape whose running direction and tape surface direction are inclined by a certain amount with respect to the substrate, and when changing each direction horizontally and vertically using a single inclined post, the angle between the tape running direction and the substrate is Even if the tape is the same, it is known that if the inclination angle in the tape plane direction is small, the wrapping angle around the inclination post becomes large. Further, when the wrapping angle becomes large, a large amount of friction occurs between the inclined post and the magnetic tape, which impedes smooth tape loading. In other words, a smaller wrapping angle is preferable for tape loading, but
In the parallel loading shown in the figure, in order to obtain an inclination in the tape surface direction, the inclination of the tape guide drum itself becomes large. Furthermore, in the U-loading shown in FIG. 4, it is difficult to manipulate the inclination in the direction of the tape surface, and there is a limit to reducing the wrapping angle around the inclined post.

Therefore, by arranging a plurality of inclined posts at relatively short intervals, the magnetic tape 9 is first given a relatively large inclination in the tape surface direction, and then the tape is run in stages by determining the running direction. Smooth tape loading can be achieved with a small wrapping angle and a loading path with small direction changes.

Embodiment FIGS. 1A and 1B show an embodiment of a magnetic recording/reproducing apparatus according to the present invention. In FIG. 1, reference numeral 11 denotes a guide drum, which is attached to a substrate 10 that vertically holds a reel stand (not shown in FIG. 1) for supplying and winding the magnetic tape 9. (221 degrees according to 8mm video standards). Note that the magnetic tape 9 runs in the direction indicated by the arrow in the figure.

The guide drum 11 is inclined in a direction substantially perpendicular to the direction in which the magnetic tape 9 is separated from the guide drum 11 (the direction indicated by the arrow S3 in the figure), and
On the other hand, the side of the guide drum 11 having a smaller height is defined as the entrance side of the magnetic tape 9, and the side of the guide drum 11 having a larger height is defined as the exit side of the magnetic tape 9. Note that the inclination angle α3 of the guide drum 11 is approximately 1.5 of the lead angle.
It has been selected twice.

By inclining the guide drum 11 in a direction substantially perpendicular to the direction in which the magnetic tape is removed as described above, the height required for tape loading can be reduced, and a thinner magnetic recording and reproducing apparatus can be realized. I can do it.

This is because the magnetic tape 9 is spirally wound around the guide drum 11, so the guide drum 11 needs to be tilted with respect to the base 10. This is because the tape path of the magnetic tape 9 can be made approximately parallel to the base 10 in the area where the magnetic tape 9 is wound around the guide drum 11 by tilting the magnetic tape 9 in a direction substantially perpendicular to the guide drum 11 (see FIG. 1). (See B).

Near the position where the magnetic tape 9 enters the guide drum 11 at the outer circumferential position of the guide drum 11, there are a guide post 16 and a guide roller 1 for regulating the vertical running position of the magnetic tape 9 when the magnetic tape 9 is attached.
5, and a plurality (for example, two) of first inclined posts 1
2 and 13 are provided. Further, a second inclined post 14 and a guide post 17 are provided at the outer periphery of the guide drum on the side where the magnetic tape is removed.

The magnetic tape 9 is loaded while maintaining a horizontal running position approximately equal to the horizontal running position when it is pulled out from the reel stand (not shown in FIG. 1) held by the substrate 10, and passes through the guide post 16. It reaches the inclined post 12 and is raised step by step by the inclined posts 12 and 13 to reach the entry position A. First, the magnetic tape 9 is given a small inclination in the running direction and a relatively large inclination in the surface direction diagonally upward by the inclination post 12 . Next, the magnetic tape 4 is tilted at a predetermined tilt angle (guide drum 11
(approach angle), and also eliminates the inclination in the tape surface direction caused by the inclined post 12.

As described above, by first giving the magnetic tape 9 a relatively large inclination in the plane direction with the inclined post 12, the magnetic tape 9 and the respective inclined posts 12 and 13 are
The wrapping angle can be made small, and therefore the frictional force generated at the spliced portion is small, allowing smooth tape loading. Further, the next inclined post 13 removes the inclination in the tape surface direction given to the magnetic tape 9 by the inclined post 12, and
Let the running direction of the guide drum 11 be a predetermined inclination angle (approach angle to the guide drum 11). As a result, the tape loading after the inclined post 13 has a small inclination in the tape surface direction (a large inclination in the tape surface direction occurs only in the portion sandwiched between both inclined posts 12 and 13), and the magnetic tape 9 can enter the guide drum 11 in good condition.

The magnetic tape 9, which has been moved upward by the inclined posts 12 and 13, is reversed in its running direction by the guide rollers 15 and moved from the entry position A to the guide drum 1.
1 and is wound spirally around the guide drum 11.

The guide drum 11 is inclined at an angle approximately 1.5 times the lead angle (7.5 degrees according to the 8 mm video standard) in a direction perpendicular to the direction in which the magnetic tape 9 is removed. By selecting this angle and direction of inclination, in the magnetic tape 9 wound around the guide drum 11 in FIG. The relative height of the tape is approximately constant, and the tape path is approximately parallel to the substrate surface.

Therefore, in order to guide the magnetic tape 9 from the horizontal running position to the entry position of the guide drum 11, the magnetic tape 9 wound around the guide drum 11 in the portion from the symbol C position to the entry position A in FIG. It is sufficient to raise the magnetic tape 9 by the sum of the rising dimension of the magnetic tape 9 and the rising dimension of the magnetic tape 9 from the entry position A to the guide roller 15. The winding portion of the magnetic tape 9, which directly contributes to determining this rising dimension, is moved from the position of symbol C to the guide roller 15 as described above.
Therefore, the rising dimension is a small value, and the guide roller 8 is at a low position (3.4 mm higher than the height of the symbol C position in Fig. 1 A according to the 8 mm video standard) and the guide roller 8 is at a low position (3.4 mm higher than the height of the symbol C position in Fig. drum 11
It can be provided at a position near the.

In addition, the inclined posts 12 and 13 and the guide roller 1
5, it is only necessary to move the magnetic tape 9 upward by a small upward dimension, so the distance between each post can be shortened, and the installation distance from the inclined post 12 to the guide roller 15 can be shortened. . Therefore, the inclined posts 12, 13 and the guide roller 15 can be arranged in extremely close positions along the outer periphery of the guide drum 11.

The magnetic tape 9 is magnetically recorded and reproduced while being wound around the guide drum 11, and is removed from the guide drum 11 at a removal position B. The magnetic tape 9 detached from the guide drum 11 is guided by the inclined post 14 to a horizontal running position.
The running direction is changed by the guide post 17, and the reel stand on the take-up side (not shown in Fig. 1)
It is wound up.

At this time, the magnetic tape 9 is attached to one inclined post 14.
However, at the detachment position B, the inclination direction of the guide drum 11 and the detachment direction of the magnetic tape 9 are perpendicular to each other, and the winding angle of the magnetic tape 9 around the inclined post 14 is the smallest. The frictional force is small and smooth tape loading is performed.

Here, FIG. 2 shows the mounting state of the device of the present invention.
In the figure, a cassette half 18 has reel stands 19a and 19b for supplying and winding the magnetic tape 9. On the entrance side of the magnetic tape 9 along the outer periphery of the guide tram 11, an impedance roller 20 and an erase head 2 are provided in the tape loading path between the cassette half 18 and the guide post 16.
1, guide posts 22, 23, tension regulator 24, etc. are provided. Also, on the tape loading path between the cassette half 18 and the guide post 17 of the magnetic tape 9, a control head 25, a capstan 26, a pinch roller 27,
Guide posts 28 and the like are provided.

The guide roller 15, the inclined posts 12, 13, and the guide post 16 are attached to an annular loading ring 29 provided on the outer periphery of the guide drum 11. This loading ring 29 rotates on a guide rail (not shown) provided on the substrate 10 in correspondence with the loading ring 29, and the guide roller 15 and the inclined posts 12, 1 follow the guide rail (not shown).
3 and the guide post 16 move around the outer periphery of the guide drum 11 to load the magnetic tape 9. As mentioned above, the guide roller 15 and the inclined post 1
Since the spacing between the rings 2 and 13 is short, the loading ring 29 can be made small. Further, when the loading ring 29 is in the unloading position, the guide roller 15, the inclined posts 12, 13, and the guide post 16 can be housed in the cassette half 18 without changing their arrangement intervals.

Effects of the Invention As described above, according to the magnetic recording and reproducing apparatus of the present invention, the guide drum is tilted in a direction perpendicular to the direction in which the magnetic tape leaves the magnetic tape, and the magnetic tape is moved from the horizontal running position to the entering position of the guide drum in multiple directions. By raising the magnetic tape using an inclined post, even if the magnetic tape is wound around the guide drum over a range of 180 degrees or more, the portion of the winding range that extends approximately 180 degrees will be approximately parallel to the substrate surface. The winding angle of the magnetic tape, which directly contributes to raising the magnetic tape to the guide drum entry position without changing its height relative to the substrate, is a relatively small angle excluding the above-mentioned approximately 180 degree portion, Therefore, the height required for tape loading is small because the height required for tape loading is small, and the guide roller can be placed at a low position near the guide drum. can be made thinner,
In addition, since the entry position is at a low position, the spacing between the inclined posts and guide rollers that move the magnetic tape upward to the entry position can be kept small. Since the tape loading path can be installed very close to the guide drum, the tape loading path becomes a short path along the outer periphery of the guide drum, making it possible to downsize the magnetic recording and reproducing device. Since the magnetic tape is moved upward, a large inclination in the tape surface direction can be applied to the magnetic tape within a short tape loading path, and the winding angle of the magnetic tape at each inclined post is therefore a small angle between the inclined post and the magnetic tape. It has the advantage that the frictional force caused by the attachment of the tape is small and the tape can run smoothly.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the magnetic recording/reproducing device according to the present invention, FIG. 2 is a schematic configuration diagram showing an example of the mounting state of the device of the present invention, and FIG. 3 is for explaining parallel loading. FIG. 4 is a schematic diagram for explaining U loading. 2,10...Substrate, 3,11...Guide drum, 4,9...Magnetic tape, 6a, 6b, 12,
13, 14... Inclined post, 8, 15... Guide roller, 19a, 19b... Reel stand, 29...
loading ring.

Claims (1)

[Claims] 1. A substrate holding a magnetic tape reel stand vertically, a guide drum provided on the substrate and inclined in a direction substantially perpendicular to the direction in which the magnetic tape is removed, and a guide drum located on the outer periphery of the guide drum that holds the reel stand of the magnetic tape vertically. It consists of a first inclined post provided near the position where the magnetic tape enters the guide drum, and a second inclined post provided near the position where the magnetic tape leaves the guide drum. One inclined post gives a relatively larger inclination in the tape surface direction than the horizontal running position of the magnetic tape, and the next first inclined post eases the inclination in the tape surface direction and guides the magnetic tape to the entering position; A magnetic recording/reproducing apparatus characterized in that the second inclined post guides and runs the magnetic tape to a horizontal running position.