JPH0442422A - Rotary head drum device - Google Patents

Abstract

PURPOSE:To obtain an image with high quality by displacing a head in the radial direction of a rotary drum corresponding to the operating mode of a tape device. CONSTITUTION:When a signal from an operating mode circuit 10 is supplied to a driving means 8 via a control means 9 and an actuator 5 is driven, the head 7 fixed on the actuator 5 is moved freely in the radial direction. Since the head 7 is not used in a fast feed/rewind mode, contact with a tape 6 can be evaded by drawing in from a drum outer peripheral plane in the radial direction of an upper drum 14 by the actuator 5. Also, since tape tension is low in a CUE/REV mode compared with that in recording/reproduction, contact pressure between the tape 6 and the head 7 is low, which generates an unstable contact state, therefore, the amount of protrusion is increased. In such a way, the damage of the tape 6 can be reduced, and the service life of the rotary head 7 can be prolonged, and the contact state between the head 7 and the tape 6 can be maintained satisfactorily, and picture quality can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary head drum device used in a tape device such as a video tape recorder that uses a rotary head to record and reproduce signals on a tape.

2. Description of the Related Art FIGS. 6 and 7 show an example of a rotary head drum device used in a conventional tape device. FIG. 6 is a perspective view of a conventional rotary head drum device.

In FIG. 6, the tape 6 fed from a supply reel (not shown) passes through several tape guide posts and erase heads (none of which are shown), and then passes through an inlet tape guide post 12 to a rotating head drum. The exit tape guide post 13 is wrapped around the device 1 at a predetermined angle.
The tape contacts an audio control head (not shown), is further fed at a constant speed by a capstan and a pinch roller (both not shown), and is wound onto a take-up reel (not shown).

FIG. 7 is a side sectional view of the rotary head drum device 1. The rotary head drum device 1 includes an upper drum 14 that rotates in contact with the tape 6, a motor 2 that rotates the upper drum 14, and a motor 2 that fixes the motor 2 and that contacts the tape 6 with its outer circumferential surface and rotates one of its outer circumferential surfaces. The lower drum 16 is fixed and guides the tape 6 to the drum device 1 in an oblique direction by means of a lead portion 15 provided at the lower portion. The upper drum 14 is directly connected to the rotating shaft 3 of the motor 2. The head 7 for recording signals on the tape 6 and reproducing the recorded signals is fixed to a head base 17, and the head base 17 is fixed to a part of the upper drum 14 using screws or the like. . recording a signal between the tape 6 and the head 7;
In order to perform reproduction, the head 7 is provided to protrude from the outer peripheral surface of the upper drum 14 so as to come into contact with the tape 6.

In order to electrically couple the head 7 and the signal processing circuit,
A rotor side 18 of a rotary transformer fixed to the upper drum 14 and rotating together with the upper drum 14, and a stator side 19 of the rotary transformer fixed to the fixed drum 16.
are placed facing each other.

Problems to be Solved by the Invention Currently, in VTRs, it is desired to shorten the mode switching time of each operation mode due to operability issues. In order to achieve this, it is necessary that the tape is always wound around the rotary head drum device 1 in any operating mode. In the conventional mechanism as described above, the head is fixed and always protrudes from the outer peripheral surface of the drum so as to be in contact with the tape. In operation modes where the tape speed is tens to hundreds of times faster than normal playback, such as fast forward/rewind operations, if the tape is in contact with the head other than during recording and playback as described above, , the possibility of scratching the tape is very high due to the friction between the tape and the head. Additionally, the rotating head wears out quickly, shortening its lifespan.
Further, there is a problem in that abrasion powder generated by wear adheres to the head, making the head more likely to become clogged, and as a result, good recording and reproduction becomes impossible.

Furthermore, in a search operation (hereinafter referred to as CUE/REV) in which the tape is moved faster than the normal playback speed, the tape is fed with a lower tape tension than during normal playback. In this mode of operation, the contact between the head and the tape becomes unstable due to the low tape tension, resulting in a problem that the search image quality deteriorates.

Furthermore, in order to improve image quality, a large number of heads are currently installed, such as a dedicated head for each of the 2H mode and 6H mode, and a dedicated head for the special recording/reproduction mode. For example, in the case of 2H mode, the head dedicated to 8H mode increases the shifter by hitting the tape even though it is useless, and the head dedicated to 6H mode, which is not involved in signal exchange, is in contact with the tape. Another problem was that the recorded signal on the tape was picked up and passed through the rotating head, causing crosstalk.

The present invention solves the above problems and aims to provide an improved rotary head drum device.

Means for Solving the Problems In order to achieve the above objects, the present invention provides an actuator that movably supports a head in the radial direction of a rotating drum, a drive means for the actuator, and a drive means for the actuator that supports the head so as to be movable in the radial direction of a rotating drum. and means for controlling the driving means to displace the head in the radial direction of the rotating drum device.

action The present invention operates as follows with the above-described configuration.

(1) During fast forwarding and rewinding, damage to the tape is minimized, the life of the rotary head is extended, and abrasion particles generated by wear are prevented from adhering to the head (to prevent clogging of the head).

(2) During CUE/REV, the contact state with the head base is improved at a lower tape tension than during normal playback to improve image quality.

(3) In drum devices that have a large number of heads, such as heads dedicated to 2H mode and 6H mode, and special recording/playback heads, image quality deteriorates due to a reduction in image quality and crosstalk from heads that are not involved in signal transmission and reception. improve.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 5. In these figures, the same parts as those explained in Figs. 6 to 7 are given the same reference numerals.
The explanation will be omitted.

FIG. 1 is a sectional side view of a rotary head drum device according to an embodiment of the present invention, and FIG. 2 is a head operation diagram and a block diagram of the rotary head drum device of the present invention.

In the figure, one end of an actuator 5 is fixed to an upper drum 14 that is directly connected to a rotating shaft 3 of a motor 2, and the other end of the actuator 5 is used for recording signals on a tape 6.
A head 7 for reproducing recorded signals is fixedly attached. As shown in FIG. 2, the head 7 is provided in advance to protrude from the outer peripheral surface of the upper drum 14 by a protrusion amount δ so as to come into contact with the tape 6. Actuator 5
For example, a laminated piezoelectric element that is displaced by the application of a voltage is used, and the direction of displacement is in the radial direction of the upper drum 14. Therefore, when a signal from the operation mode circuit 10 is applied to the drive means 8 via the control means 9 to drive the actuator 5, the head 7 fixed to the actuator 5 freely moves in the radial direction shown by arrows B and C. .

Next, the moving operation of the head 7 in each operation mode will be explained with reference to FIGS. 3 to 5.

Figure 3(a) shows the time of recording/playback or stop (STOP, P
Hera in LAY)]! 7 protruding state, Fig. 3(b)
shows the protruding state of the head 7 in the fast forward/rewind (FF/RWD) mode. Since the head 7 is unnecessary in the fast forward/rewind mode, the tape 6 is retracted from the outer circumferential surface of the drum by the actuator 5 in the radial direction of the upper drum 14.
Avoid contact with.

FIG. 4(a) shows the protruding state of the head 7 in the playback (PLAY) mode, and FIG. 4(b) shows the protruding state of the head 7 in the CUE/REV mode. Here, CUE
In the /REV mode, the tape tension is lower than during recording and playback, so the contact pressure between the tape 6 and the head 7 is low.
Since the contact condition becomes unstable, increase the protrusion amount as shown in the figure.

FIG. 5 shows the head protruding state in the recording/reproducing mode in a drum device having four heads, a head 7a dedicated to the 2H mode and a head 7b dedicated to the 6H mode. First, Figure 5 (
In the 2H mode of a), the 6H mode dedicated head 7b
By recessing the tape from the outer peripheral surface of the drum, the jitter component caused by the tape beating of the 6H mode dedicated head 7b is eliminated. In the 6H mode shown in FIG. 5(b), by recessing the 2H mode dedicated head 7a from the outer peripheral surface of the drum, the jitter component caused by the tape beating of the 2H mode dedicated head 7a is eliminated. In addition, the same can be said of the special recording/reproducing head as shown in FIG. 5 above.

As described above, according to the rotating head drum device of the embodiment of the present invention, since the unnecessary head is retracted inward from the outer peripheral surface of the drum, unnecessary wear is eliminated compared to the conventional example in which the protrusion amount remains constant. The life of the head will be extended. In addition, damage to the tape due to contact with the head is reduced, and the number of foreign objects on the head due to frictional wear of the tape and head is reduced. In addition, since the optimum contact state between the head and the tape can be achieved in each mode, good image quality can always be obtained. In addition, in a rotating head drum device that has a large number of heads, since the heads that are not involved in recording and playback can be retracted, the jitter component caused by those unnecessary heads is eliminated, and crosstalk is also reduced, resulting in a reproduced image with high surface quality. be able to.

Effects of the Invention As is clear from the above embodiments, the present invention provides an operation for pulling the useless head inward from the outer peripheral surface of the drum, and an operation for adjusting the amount of head protrusion to optimize the contact state between the head and the tape. Because of this, there are fewer 111 scratches on the tape, longer head life, and less head ROM blockage.
It is possible to provide a rotating head drum device that has the effects of good contact between the tape and the head, no increase in jitter, and little crosstalk, and can therefore produce images of crystal quality.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a rotary head drum device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the head operation installed in the rotary head drum device of the present invention, and FIG. 3 is a recording/reproducing device. , an explanatory diagram showing the protruding state of the head during stop and fast forward/rewind operation mode, Fig. 4 is an explanatory diagram showing the protruding state of the head in playback mode and CUE/REV mode, Fig. 5 is exclusively for 2H mode and 6H mode. 2H in a rotating head drum device with 4 heads
FIG. 6 is a perspective view of a rotary head drum device of a conventional tape device, and FIG. 7 is a side sectional view of the same rotary head drum device. It is. 1... Drum device, 5... Actuator,
7...Head, 8...Driving means, 9...
- Control means, 10... Operation mode circuit, 14...
- Upper drum. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 1, ? 1 - - Drum surface 5 - Actuator 7 - Head 14 - - j Drum 2 Figure 3 Section L) STOP, PLAY (bJFF/RWD 4th Section 5 Section Figure

Claims (1)

[Claims] an actuator that supports the head so as to be movable in the radial direction of the rotating drum; a driving means for the actuator; and controlling the driving means to displace the head in the radial direction of the rotating drum according to an operation mode of the tape device. A rotating head drum device comprising means.