JPH01303605A - Magnetic recording and/or reproducing device - Google Patents

Abstract

PURPOSE:To attain the wide band signal transmission and to realize an excellent durability as non-contact constitution by executing the signal transmission with a rotary head and an external part with light transmission. CONSTITUTION:At least signal light receiving parts 4 and 8 are arranged approximately on the rotary shaft extension line of a rotor 1 and the signal transmission can be executed facing signal light emitting parts 11 and 13 provided at a static part 7 or the rotor 1. At the time of a magnetic recording, a recording signal is light-transmitted from a signal light-emitting part 11 provided at the static part 7 to the signal light-receiving part 4 to the signal light receiving part 4 provided at a rotary drum 1, and at the time of the magnetic reproduction, a reproducing signal is light-transmitted from the signal light-emitting part 13 provided at the rotary drum 1 to the signal light-receiving part 8 provided at the static part 7. Thus, a signal transmission means without depending on a rotary transformer and a slip ring device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotating head type magnetic recording/reproducing device, and more specifically, the present invention relates to a rotating head type magnetic recording/reproducing device, and more specifically, to controlling signals between the rotor side of a rotating drum and the outside of the rotating drum during magnetic recording/reproducing. Concerning transmission means.

[Conventional technology]

In conventional rotating head type magnetic recording/reproducing devices, signals are transmitted between the rotor side of the rotating drum and the outside of the rotating drum using a rotating transformer with windings on the rotor side and stator side, respectively, or a slipper on the rotor side. I with a ring device!
A method of transmission through mechanical contacts was used.

[Problem to be solved by the invention]

However, in the signal transmission means using a rotary transformer or a slip ring device as described above, the transmission band is limited by resonance caused by the inductor component of the rotary transformer and the capacitor component of the cable, regenerative amplifier, etc.
In addition, slip ring devices lack durability because they have mechanical contact parts, become a source of noise due to increased contact resistance, and have drawbacks such as the need to periodically replace parts. was.

Therefore, it is an object of the present invention to solve the above problems and provide a signal transmission means that does not rely on a rotary transformer or a slip ring device.

[Means to solve the problem]

The present invention has been made in order to solve the above-mentioned problems, and at least the signal light receiving part is installed on the extension line of the rotational axis of the rotating body, and the signal light emitting part provided on the stationary part or the rotating body is made to face it. The configuration allows for signal transmission.

[Effect]

According to the above configuration, during magnetic recording, the recording signal can be optically transmitted from the signal emitting section provided on the stationary part to the signal receiving section provided on the rotating drum, and during magnetic reproduction, the signal emitting section provided on the rotating drum can optically transmit the recording signal. The reproduced signal can be optically transmitted from the stationary section to the signal receiving section provided in the stationary section.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 5.
I will explain it later.

': Jj1 is a first embodiment of the present invention, in which a main part of a dedicated magnetic reproduction device is provided with a pair of signal light emitting sections (hereinafter referred to as the light emitting section) and a signal light receiving section (hereinafter referred to as the light receiving section). 1 is a side view showing a rotating drum, a first head 2 is fixed to the outer periphery, a light emitting part 13 with the light emitting surface facing upward is fixed to the center of the upper plane, and - - A light receiving section 8 with its light receiving surface facing the center of the rotating drum 1 is fixed on the stationary section 7 which is fixed in parallel while maintaining a constant gap, on an extension line of the center of the rotation axis of the rotating drum 1 to form an optical path. It consists of

With this configuration, the reproduced signal read by the first head 2 passes through a reproducing amplifier (not shown) provided in the rotating drum 1, and then is transmitted from the light emitting section 13 to the light receiving section 8 by optical coupling. can do.

Although the light emitting section 13 is mounted on the center line of the rotating shaft of the rotary drum 1 in the case of FIG. If it is fixed toward the light receiving section, the reproduced signal can be transmitted in the same way as in 1.1.

Further, in FIG. 1, by arranging the light receiving section 4 at the position of the light emitting section 13 and further disposing the light emitting section 11 at the position of the light receiving section 8, an optical path exclusively for recording can be constructed.

Next, FIG. 2 is a side view showing the main parts of a magnetic recording/reproducing apparatus equipped with two pairs of light emitting parts and light receiving parts, as a second embodiment of the present invention, and ■ indicates the first head 2 containing The rotating drum 7 is a stationary part fixed parallel to the plane of the rotating drum 1 with a certain gap maintained therebetween. A light-receiving section 4 with a light-receiving surface facing upward and a light-emitting section 13 with a light-emitting surface facing upward are fixed adjacent to each other at the center of the plane of the rotating drum l, while the stationary section 7 has a rotating shaft of the rotating drum l. A light-emitting section 11 with a light-emitting surface facing downward and a light-receiving section 8 with a light-receiving surface facing downward are fixed adjacent to each other on an extension line of the center. With the above configuration, two different optical paths are created, and bidirectional optical coupling, that is, transmission of recording/reproduction signals is possible.

In addition, in such a configuration, the positional relationship between the light emitting part and the light receiving part changes to some extent as the rotary drum l rotates.
Since the optical signal from the light emitting section is emitted with a certain degree of spread angle, it can be sufficiently received.

Further, FIG. 3 is a side view showing an optical system path according to a third embodiment of the present invention, and FIG. 4 is a plan view showing an example of the arrangement of components on the rotating drum side of FIG. 3. In the above two drawings, 1 shows the first head 2 and the second head 3 at an outer circumference of 180 mm.
4 is a first light-receiving section fixed to the center of the plane of the rotary drum L with its light-receiving surface facing upward; 5 is a rotating drum with a predetermined gap formed above the first light-receiving section 4; with the light receiving section facing upward, adjacent to the first light receiving section 4;
This is a second light-receiving section supported by a first support 6 that is vertically fixed. 7 is a stationary part that is fixed parallel to the plane of the rotating drum 1 and with a predetermined gap maintained;
A third light receiving section 8 with its light receiving surface facing the center of the rotating drum is fixed on the opposing surface of the stationary section 7 on an extension line of the center of the rotating shaft of the rotating drum l, and furthermore, this third light receiving section 8 A fourth light-receiving section 9 with its light-receiving surface facing downward with a predetermined gap in front of (downward in the drawing) is mounted by a second support 10 vertically fixed adjacent to the third light-receiving section 8. I support it. Reference numeral 11 denotes a first light emitting section which has its light emitting surface facing the first light receiving section 4 and is fixed to the static +h section 7 so that the optical path does not shift while the rotating drum 1 is rotating. This first light emitting section 11 is connected to the magnetic tape 15 shown in FIG.
While in contact with the first light emitting section 11, the optical path from the first light emitting section 11
It is installed at a location where it will not be obstructed by the support body 6. Reference numeral 12 has a light emitting surface directed toward the second light receiving section 5, and the stationary section 7 so that the optical path does not shift while the rotating drum 1 is rotating.
This is the second light emitting section fixed to the. Reference numeral 13 designates a third light emitting section which has its light emitting surface facing the third light receiving section 8 and is fixed to the flat side of the rotary drum 1 so that the optical path does not shift during the rotation of the rotary drum 1.

This third light emitting section 13 is located at a position where the optical path from the third light emitting section 13 is not blocked by the second support 10 while the first head 2 is in contact with the magnetic tape 15 shown in FIG. Selected and installed. Reference numeral 14 designates a fourth light emitting section whose light emitting surface is directed toward the fourth light receiving section 9 and is fixed to the flat side of the rotary drum 1 so that the optical path does not deviate during rotation of the rotary drum 1.

Note that the first support 6 and the second support 10 are equipped with signal lines for transmitting signals from the second light receiving section 5 and the fourth light receiving section 9, respectively.

Furthermore, the first support body 6 and the second support body IO are not limited to the upright columnar shapes as shown in FIG.
: Any structure and mounting position may be used as long as the optical path of each of the light emitting units 11 to 14 described above is not blocked.

Furthermore, although the third light emitting section 13 and the fourth light emitting section 14 shown in FIG. In order to reduce noise and prevent noise generation, it is configured to be flush with the plane of the rotating drum 1 or to be as low as possible.

The electrical connections among the light emitting section, light receiving section, and head described above are as shown in the signal system block diagram in FIG. Record/playback switch 21.2
All of the components 2 and the like are housed in the rotating drum 1 (not shown), and the power for driving them is guided into the rotating drum 1 by a rotating transformer (not shown), rectified, and applied.

As can be seen from FIGS. 3 and 5, during recording, the first light emitting section 11 and the second light emitting section 12 provided on the stationary section 7 side are alternately connected to the first light emitting section 11 and the second light emitting section 12 provided on the rotating drum l side. Light receiving section 4
The recording signal is optically transmitted to the second light-receiving section 5, converted into an electric signal, amplified by the recording amplifier 17, and recorded on the magnetic tape 15 by the first head 2 via the recording/reproduction switch 21. The signal amplified by the recording amplifier 18 is recorded on the magnetic tape 15 by the second head 3 via the recording/reproduction changeover switch 22. On the other hand, during playback, the first head 2 and the second head 3 alternately read from the magnetic tape 15, and the signal from the first head 2 is passed through the recording/playback switch 21 and the playback amplifier 19, respectively. The third light emitting section 13 optically transmits the signal to the third light receiving section 8, and the signal from the second receiver 3 passes through the recording/reproducing switch 22 and the reproducing amplifier 20, respectively, to the fourth light receiving section 8.
Light is transmitted from the light emitting section 14 to the fourth light receiving section 9, and a reproduced signal is sent out.

〔Effect of the invention〕

As explained above, according to the present invention, unlike signal transmission using a conventional rotary transformer or slip ring device,
Signals are transmitted between the rotary radiator and the outside through optical transmission, which enables wideband signal transmission, and the non-contact configuration provides excellent durability.
Since it has a plurality of transmission paths for recording and reproduction, it has effects such as less crosstalk between each signal.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main part of a magnetic reproducing apparatus showing a first embodiment of the present invention, and FIG. 2 is a side view of the main part of a magnetic recording/reproducing apparatus showing a second embodiment of the invention. Figure 3 is the third diagram of the same invention.
FIG. 4 is a plan view showing the arrangement of components on the rotating drum side according to the third embodiment of the present invention, and FIG. 5 is a block diagram of the signal system of the same invention. . In the figure, ■・One-rotation driver 11.2-1st head, 3-2nd head
Head, 4.5.8. l-light receiving part, 6.10-support body,
7-Stationary part, 11.12.13.14-Light emitting part, 15-
Magnetic tape, 16- Tape guide, 17. ia-recording amplifier, 19.20-reproducing amplifier, 21.22.
-Record/playback switch Patent applicant Fujitsu General Co., Ltd. Figure 1 Figure 2 Chi 30 S Figure 5 Stationary part side Rotating tram side

Claims (4)

[Claims] (1) A signal receiving section or a signal emitting section is provided approximately in the center of a plane of a rotating drum, which has a magnetic head on the outer periphery of a cylindrical rotating body having a rotating shaft as its center, and A magnetic recording and/or reproducing device that transmits signals by optical coupling, in which a signal light emitting part or a signal light receiving part facing the signal light receiving part or the signal light emitting part is provided on the opposing surface of the stationary part which is fixed while maintaining an air gap. (2) A signal light receiving part and a signal light emitting part are provided adjacent to each other approximately at the center of a plane of a rotating drum having a magnetic head on the outer periphery of a cylindrical rotating body having a rotation axis as its center;
A signal emitting section and a signal receiving section are provided adjacent to each other on opposing surfaces of the stationary section which is fixed with a certain gap with respect to the rotating drum, and signals are transmitted by bidirectional optical coupling through at least two different optical paths. The magnetic recording and/or reproducing apparatus according to claim 1, which transmits data. (3) A substantially planar central part of a rotating drum, which has a first magnetic head on the outer periphery of a cylindrical rotating body having a rotation axis as the center, and a second magnetic head at a position 180 degrees off the outer periphery of the first magnetic head. , a first signal receiving section is provided near the tip of a first support provided vertically adjacent to the first signal receiving section, parallel to and constant above the first signal receiving section. A second signal receiving section is provided with the light receiving surface facing upward while maintaining a certain gap with respect to the rotating drum.On the other hand, on the opposite surface of the fixed stationary section that maintains a certain gap with respect to the rotating drum, the center of the rotation axis of the rotating drum is provided. A third signal receiving section with a light receiving surface facing toward the center of the plane of the rotating drum is provided on an extension line of the rotary drum, and a second signal receiving section is provided adjacent to the third signal receiving section and facing toward the planar surface of the rotating drum. A fourth signal receiving section is provided near the tip of the support body, parallel to the light receiving surface of the third signal receiving section, maintaining a constant gap, and with the light receiving surface facing the center of the plane of the rotating drum, and further An optical path to the first signal receiver is provided on the opposing surface of the stationary portion at least during a period when the first magnetic head electrically coupled to the first signal receiver is in contact with the magnetic tape. A first signal light emitting section with a light emitting surface facing the first signal light receiving section is provided in a position where there is no risk of the light being blocked by the second signal light receiving section and the first support supporting the second signal light receiving section, and At least during the period when the second magnetic head electrically coupled to the second signal receiver is in contact with the magnetic tape, the optical path to the second signal receiver is connected to the fourth signal receiver and this. A second signal receiving section with a light emitting surface facing the second signal receiving section is provided in a position where there is no risk of being blocked by a second support supporting the rotary drum. At least during the period when the first magnetic head electrically coupled to the light emitting section is in contact with the magnetic tape, the light is emitted at a position where it will not be blocked by the fourth signal receiving section and the second support supporting it. A third signal emitting section is provided with a surface facing the third signal receiving section, and the second magnetic head electrically coupled to the fourth signal emitting section is in contact with at least the magnetic tape. During this period, the light emitting surface is directed toward the fourth signal receiving section so that the optical path to the fourth signal receiving section is not likely to be blocked by the second signal receiving section and the first support supporting it. 2. The magnetic recording and/or reproducing apparatus according to claim 1, further comprising a fourth signal emitting section and transmitting signals by optical coupling. (4) The magnetic recording and/or reproducing device according to claim 3, wherein the first support and the second support are each equipped with a conductor for transmitting a signal from a signal light receiving section.