JPH0334139B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device typified by a cassette video tape recorder, and particularly to a mounting structure for a rotating head cylinder thereof.

[Summary of the invention]

The present invention provides a magnetic recording/reproducing device in which a magnetic tape is wound around the outer periphery of a rotary head cylinder, in which the rotary head cylinder is placed on a base included in a substrate;
A support member is provided integrally with the lower cylinder of the rotary head cylinder and extends above the inside of the diameter of the rotary head cylinder, and a pressing member formed on the substrate allows the support member to be positioned on the inside of the diameter of the rotary head cylinder. The rotary head cylinder is pressed from above to accurately fix the rotary head cylinder with a simple structure, thereby reducing the size and cost of the device.

[Conventional technology]

In video tape recorders and the like, the magnetic head is generally rotated in order to increase the relative speed between the magnetic tape and the magnetic head. Such rotating heads include two-piece types and three-piece types. There are two-piece types in which the lower cylinder is fixed and the upper cylinder equipped with a magnetic head is rotated, and the lower cylinder and upper cylinder are also fixed and the rotating magnetic head is exposed between the upper and lower cylinders. There are things that make you do it. On the other hand, in the three-piece type, an upper cylinder and a lower cylinder are fixed, and an intermediate cylinder having a magnetic head mounted therebetween is rotated. Attachment of such a rotating head to the board is as follows:
In either type, this is accomplished by fixing the lower cylinder or a member fixed to the lower cylinder to a base, a board, or the like with screws or the like.

[Problem that the invention seeks to solve]

However, although the conventional device in which the lower cylinder or a member fixed to the lower cylinder is fixed to a base or a board using screws or the like is stable, it has the disadvantage that it is not suitable for miniaturization. Therefore, it has been difficult to apply it to 8 mm video tape recorders, etc., which are characterized by being smaller than 1/2 inch video tape recorders.

[Means for solving problems]

Each of the figures shows a mounting structure for a rotating head cylinder of a magnetic recording/reproducing apparatus according to the present invention.
In these figures, reference numeral 1 denotes a base plate, to which a two-piece type rotary head cylinder 2 is attached. A base 40 has a reference surface inclined at a predetermined angle, and is fixed to the substrate 1. 41,
Reference numeral 42 denotes an upper cylinder and a lower cylinder constituting the rotating head cylinder 2, both of which are fixed cylinders in this example. Reference numeral 43 denotes a gap formed between the upper cylinder 41 and the lower cylinder 42, from which the rotating magnetic head 44 is exposed. A connecting member 45 connects the upper cylinder 41 and the lower cylinder 42 vertically. The surfaces of the connecting member 45 that come into contact with the cylinders 41 and 42 are formed with the same curvature as each cylinder 41 and 42, and by bringing the cylinders 41 and 42 into contact with that surface, the centers of the cylinders 41 and 42 are aligned. It is made to be. 46 is the connecting member 4
5 is a plate fixed to the upper cylinder 41.
By coming into contact with the upper end surface of the shaft, its position in the thrust direction is regulated. Reference numeral 47 denotes a support member made of metal or the like fixed to the connecting member 45 (or plate 46), and has a notch 48 formed at a position approximately corresponding to above the center of the upper cylinder 41. 49 is a pressing member fixed to the substrate 1, and a screw 51 is screwed into the support member 47 at a position corresponding to the notch 48. The tip of the screw 51 is in contact with the notch 48 . Reference numeral 52 denotes at least two holes formed on the lower surface of the lower cylinder 42 at a distance of about 180 degrees from each other (only one hole is shown in FIG. 1 for convenience). 53 is base 4
It is a pin fixed by press fitting etc. in the hole 52.
are correspondingly arranged so as to be mated with each other. Of course, the base 40, the pressing member 49, etc. may be formed integrally with the substrate 1.

[Effect]

The effect will now be explained. In fixing the rotary head cylinder 2 to the substrate 1, an assembly of an upper cylinder 41 and a lower cylinder 42 is first prepared. The upper cylinder 41 and the lower cylinder 42 are vertically connected by a connecting member 45. Connecting member 4
The surfaces that come into contact with the cylinders 41 and 42 of No. 5 are formed with the same curvature as each cylinder 41 and 42,
Since the cylinders 41 and 42 are in contact with that surface, the centers of the cylinders 41 and 42 are exactly aligned. Also, the plate 4 fixed to the connecting member 45
Since the upper end surface of the upper cylinder 41 is in contact with the upper cylinder 6, its position in the thrust direction is also accurately regulated. Then, such an assembly is placed on the reference surface of the base 40 by fitting the pin 53 fixed to the base 40 into the hole 52 formed on the lower surface of the lower cylinder 42. As a result, the cylinder 41,
42 is prevented from shifting in a direction perpendicular to the center. It is also possible to fix the lower cylinder 42 to the base 40 by inserting screws from below the base 40, but it is necessary to increase the size of the base 40 to accommodate the insertion of the screws, so this is not recommended for miniaturization. It is preferable to form the pin 53 and the hole 52 as in the example (their positions may be reversed).

Next, adjust the screw 51 so that its tip presses the notch 48. The notch 48 is the upper cylinder 41
It deforms elastically to the extent that it does not touch the vicinity of the center.
Therefore, the upper cylinder 41 and the lower cylinder 42 are pressed and fixed onto the base 40 by this elastic force. Since the reference surface of the base 40 is fixed at an accurate tilt angle with respect to the substrate 1, the outer circumferential surfaces of the cylinders 41 and 42, on which the magnetic tape (not shown) is wound and run, are fixed at an accurate angle. tilt.

By providing the position of the notch 48 of the support member 47, that is, the position pressed by the pressing member 49 of the support member 47 (via the screw 51) inside the diameter of the rotary head cylinder 2, the lower cylinder 4
Even if the parallelism of the contact surfaces between the base plate 2 and the base 40 is not good, it is possible to suppress the rotational moment generated between the two and press the two substantially equally. In order to achieve this effect even if the surface with poor parallelism is located in any direction, it is preferable to position the surface near the approximate center of the diameter of the rotating head cylinder 2. Further, the notch portion 48 is preferably formed so as to bend in a direction parallel to the substrate 1 (or the pressing member 49) when pressed by the screw 51. For example, the first
In the figure, if the left side is connected and fixed and the right side is cut out and lowered, the screw 51 is likely to slip, so it is better to connect and fixed on the right side and have the left side cut out and lowered.

It is also possible to directly press the upper cylinder 41, which does not rotate, from the pressing member 49. However, in this case, the positions of the upper cylinder 41 and the lower cylinder 42, which are accurately positioned by the connecting member 45, are slightly shifted, making it difficult to run the magnetic tape accurately. Therefore, as in the embodiment, the connecting member 45 is extended to the vicinity of the center of the cylinders 41 and 42 (the supporting member 47 is provided integrally with the connecting member 45), and the vicinity of the center is pressed by the screw 51. Good.

In the above description, the rotating head cylinder 2 is of a two-piece type and the upper cylinder 41 is a fixed cylinder.
It may be a rotating cylinder that is integrally fixed. In this case, the support member 47 is
It may be fixed to the side of the lower cylinder 42 so as not to come into contact with the lower cylinder 42. In this case, the support member 47
It can also be used as a holding part that holds a grounding member for dissipating static electricity caused by contact between the rotating upper cylinder 41 and the magnetic tape. Furthermore, the rotating head cylinder 2 may be of a so-called three-piece type, in which the upper and lower sides are fixed cylinders, and the middle part is a rotating cylinder to which a rotating head is attached.

〔effect〕

As described above, the present invention provides a magnetic recording/reproducing device in which a magnetic tape is wound around the outer periphery of a rotary head cylinder, in which the rotary head cylinder is mounted on a base included in a substrate, and the rotary head cylinder is integrated with the lower cylinder of the rotary head cylinder. A support member is provided that extends above the inside diameter of the rotary head cylinder, and a portion of the support member located inside the diameter of the rotary head cylinder is pressed from above by a pressing member formed on the substrate. Therefore, the rotary head cylinder can be accurately fixed with a simple configuration, and the device can be made smaller and lower in cost.

[Brief explanation of the drawing]

The figures all relate to the present invention; FIG. 1 is a side view showing the rotary head cylinder in its installed state, FIGS. 2 and 4 are sectional views thereof, and FIG. 3 is a plan view thereof. 1... Board, 2... Rotating head cylinder, 41
...Upper cylinder, 42...Lower cylinder, 45...
Connection member, 46...Plate, 47...Supporting member, 48...Notch, 49...Press member, 51...
...Screw, 52...hole, 53...pin.

Claims (1)

[Scope of Claims] 1. In a magnetic recording/reproducing device in which a magnetic tape is wound around the outer circumference of a rotating head cylinder, the rotating head cylinder is placed on a base included in a substrate, and is integrated with the lower cylinder of the rotating head cylinder. Specifically, a support member is provided that extends above the inside of the diameter of the rotary head cylinder, and a portion of the support member located inside the diameter of the rotary head cylinder is pushed upward by a pressing member formed on the substrate. A magnetic recording/reproducing device characterized by more pressing force.