JPH01119949A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attenuate vibration of a magnetic tape at the time of recording and reproducing a signal in traveling the magnetic tape wrapping around a pair of drums on their prescribed parts by regulating the movement of a prescribed range part of the tape to the drum side. CONSTITUTION:The rotary upper drum 1 for rotating with plural magnetic heads 2a-2d mounted on its outer peripheral part at prescribed intervals and the fixed lower drum 4 set up integrally with this upper drum 1 to be fixedly disposed are provided. Then, at the time of recording and reproducing the signal in traveling the magnetic tape 3 wrapping around the prescribed parts of these drums 1 and 4, the magnetic tape 3 is regulated in the movement of its prescribed range part to the side of the drums 1 and 4 by a tape supporting member 7. By this method, even if tension of the magnetic tape is disturbed when the head is withdrawn and bumped from and into the magnetic tape, the magnetic tape 3 is supported under its stable estranging condition by the tape supporting member 7, and sticking of the magnetic tape 3 to the heads 2a-2d is disallowed, thus attenuating the vibration of the tape accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a magnetic recording and reproducing apparatus that uses a rotating magnetic head to record and reproduce information on a magnetic tape.

[Conventional technology] Conventionally, VTR (v, deoTapeRecorde
Magnetic recording and reproducing devices such as R) are required to be smaller, lighter, and space-saving. Among the parts that make up this VTR, the head has a relatively large weight and volume, and in order to meet the above requirements, it is desired that the head be made smaller.

As a device that enables head miniaturization, 2 heads can be combined into 1 head.
800. 2700.p with 4 heads, compared to the normal drive method in which the NTSC method is used to drive the 2700.p. There is a driving method that obtains a magnetic recording pattern similar to that of two heads by rotating the two heads.

In this case, the drum diameter D1 when the head is 2; the drum diameter D2 when the head is 4 is D2=%X D l
-(1) Therefore, by using four heads, the drum diameter can be reduced by 33% compared to the case of two heads.

FIG. 8 is an explanatory diagram of tape vibration generation in a conventional magnetic recording/reproducing device. As shown in FIG. 8, when the diameter of the upper drum l becomes smaller in one revolution and the distance between the four magnetic heads 28 to 2d attached to it becomes narrower, the adjacent heads will not touch the magnetic tape 3 during signal reproduction. On the other hand, it is more susceptible to the vibrations of the magnetic tape 3 and the drum that occur during entry and exit.

[Problems to be Solved by the Invention] In the conventional magnetic recording and reproducing apparatus as described above, as the diameter of the drum becomes smaller, errors in the time axis occur due to tape vibrations that occur when the head enters and exits the magnetic tape. This has caused problems such as noise and deterioration of image quality.

This is mainly due to the fact that tape vibrations caused by the head entering and exiting the magnetic tape 3 are not sufficiently damped.

The present invention has been made to solve these problems, and an object of the present invention is to provide a magnetic recording and reproducing apparatus that can reduce tape vibrations that occur when a head enters and exits a magnetic tape.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a rotating upper drum that rotates with a plurality of magnetic heads mounted on the outer circumference at predetermined intervals, and a rotating upper drum that is integrally attached to the upper drum. A magnetic recording and reproducing apparatus is provided with a fixed lower drum that is assembled and fixedly installed, and records and reproduces signals by running a magnetic tape while winding it around a predetermined portion of the drum. A tape support means is provided to restrict movement toward the drum.

[Function] With the above configuration, even if the head tries to disturb the tension of the magnetic tape when it moves out or enters the magnetic tape, the tape support means supports the magnetic tape in a stable state of separation. Since the magnetic tape and head are no longer stuck together, tape vibration can be reduced.

[Example] FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the embodiment shown in FIG. 1, and FIG.
It is a sectional view showing details of the tape support member in the figure.

In FIG. 1, a rotating upper drum l is rotatably disposed above a fixed lower drum 4 having the same diameter, and four magnetic spatulas 1 (2a to 2d are arranged at equal intervals.The fixed lower drum 4 is fixed to the chassis of the device, and has a lead portion on its circumferential surface to guide the magnetic tape 3 so that it moves diagonally with respect to the travel trajectory of the head. A motor 6 is disposed at the bottom of the fixed lower drum 4, and its rotating shaft is connected to the fixed lower drum 4.
It penetrates through the inside and protrudes into the center of the upper rotating drum l to support the upper drum l for one rotation.

The fixed lower drum 4 has a part where the magnetic tape 3 separates.
As shown in FIG. 3, a tape support member 7 having a wedge-shaped opposite end is fixed with screws or the like. The tape support member 7 is attached using the lead machining escape area.

Further, on the drum portion consisting of the one-rotation upper drum 1 and the fixed lower drum 4, running regulation guides 8 and 9 are arranged so that the magnetic tape 3 can be wound within a predetermined angle range. The inner surface of the magnetic tape 3 on the exit side passing through the travel restriction guide 9 is in contact with the surface of the wedge-shaped portion of the tape support member 7.

With the above configuration 3, the magnetic tape 3 pulled out from the feed reel of the cassette is sequentially wound around the rotating upper drum l and the stationary lower drum 4 while being guided by the lead part 5 via the travel regulation guide 8. It is pulled out from a predetermined angular position, carried out via the traveling regulation guide 9, and finally wound up on a take-up reel. Recording or reproduction is performed on the magnetic tape 3 while it moves relative to four magnetic heads 2a to 2d mounted on a rotating upper drum l.

During the running process of the magnetic tape 3, when each of the magnetic heads 2a to 2d leaves the magnetic tape 3 as described above, the magnetic tape 3 is pulled in the drum rotation direction against the tension, causing tape vibration. Or tape support member 7
Since this is provided, jams do not occur and tape vibrations are suppressed.

By suppressing tape vibration, time axis errors and noise generation can be reduced.

FIG. 4 is a perspective view showing another embodiment of the present invention. In this embodiment, the tape support member 7 is fixed directly to the fixed lower drum 4 with screws in the embodiment shown in FIG. The difference is that they are configured to be attached using adhesive or the like.

In order to facilitate adhesion between the tape support member 10 and the presser plate 11, an adhesive hole 12 is provided in the presser plate 11.

This embodiment is suitable for cases where the tape support member 7 cannot be directly attached to the fixed lower drum 4, and the effects obtained thereby are similar to those of the previous embodiment.

FIG. 5 is a perspective view showing still another embodiment of the present invention.

This embodiment has a structure in which the tape support member 7 is attached on the surface of the lead part 5 in the embodiment shown in FIG.
The tape supporting member 13 is fitted into the notch at the upper end of the lead escape groove and the groove at the bottom of the fixed lower drum 4 and fixed thereto.

That is, as shown in FIG. 6, an L-shaped protrusion is provided on each of the upper and lower edges of the tape support member 13, and the protruding ends of the L-shaped protrusions are engaged with the upper ends of the lead parts 5 and the recessed holes (or The structure is such that it fits into the groove (groove) 14. With this configuration, the tape support member can be easily attached to the drum portion in a short time.

FIG. 7 is a perspective view showing still another embodiment of the present invention. In contrast to the previous embodiments in which the tape was made to run along the wall by filling the space where the magnetic tape exits, this embodiment blows air toward the tape surface where tape vibration is likely to occur. This is what I did. This is because while the tape is running, the air pressure in the gap between the tape and the drum decreases, making it easier for the tape to cling to the drum.

That is, as shown in FIG. 7, fins 15 are attached radially to the upper surface of the upper drum 1 for one rotation to draw air into the upper drum 1 according to the rotational speed, and the air introduced into the drum is transferred to the lead portion 5. The magnetic tape 3 is ejected from a ejection slit 16 (linked to the opening of the fin 15) provided in the machining relief part, and the magnetic tape 3 is bulged out depending on the slackness of the magnetic tape 3. With such a configuration, the vibration of the magnetic tape 3 that is leaving the magnetic tape 3 can be prevented from coming into contact with the tape surface.

In addition to this embodiment, if a hole for air intake is provided in the fixed lower drum 4, and this hole is communicated with a discharge port provided on the side surface, and the discharge port is maintained at atmospheric pressure, it is possible to maintain the discharge port at atmospheric pressure. In this case, the magnetic tape 3 can be levitated to prevent vibration of the magnetic tape 3 as it exits.

Incidentally, in each of the above embodiments, a configuration for eliminating tape vibration on the exit side of the magnetic tape is shown, but a tape support member is provided on the entry side of the magnetic tape,
It may be possible to reduce tape vibration on the entry side, or it may be provided on each of the exit side and entry side to completely prevent tape vibration.

[Effects of the Invention] As explained above, the present invention provides a tape support member that maintains the straightness of the magnetic tape in at least one of the entrance part and the exit part of the magnetic tape where tape vibration is likely to occur. Therefore, the head and the magnetic tape can be smoothly separated, and the occurrence of tape vibration can be suppressed. As a result, there is an effect that the time axis error of the signal and the occurrence of noise can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a magnetic recording device as a first embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the embodiment of FIG. 1,
3 is a sectional view showing details of the tape support member in FIG. 1, FIG. 4 is a perspective view showing the second embodiment of the present invention, and FIG.
The figure is a perspective view showing a third embodiment of the present invention, FIG. 6 is a sectional view taken along line VI-VI of the embodiment of FIG. 5, and FIG. 7 is a perspective view showing a third embodiment of the invention. , FIG. 8 is an explanatory diagram of the occurrence of tape vibration in a conventional magnetic recording/reproducing apparatus. In the figure. l Two-rotating upper drums 2a to 2d: Magnetic head 3: Magnetic tape 4: Fixed lower drum 5: Reed section 7.13: Tape support member Patent attorney 1) Haru Kitatake Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (3)

[Claims] (1) A rotating upper drum having a plurality of magnetic heads attached to its outer circumference at predetermined intervals and a rotating upper drum, and a fixed lower drum integrally assembled and fixedly installed with the rotating upper drum,
A magnetic recording/reproducing device for recording and reproducing signals by running a magnetic tape around a predetermined portion of the drum, comprising tape support means for restricting movement of a predetermined range portion of the magnetic tape toward the drum. A magnetic recording/reproducing device characterized by: (2) The magnetic recording and reproducing device according to claim (1), wherein the tape supporting means is a tape supporting member provided on at least one of the magnetic tape inlet side and the magnetic tape outlet side with respect to the pair of drums. Device. (3) The tape supporting means introduces air from the upper surface of the rotating upper drum or the lower surface of the stationary lower drum, and discharges this air from the side surfaces of the pair of drums. magnetic recording and reproducing device.