JPH0664688B2 - Recording device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device that is widely applied to the storage or reproduction of images, sounds, information and the like.

2. Description of the Related Art In a magnetic recording apparatus using a rotary head that is currently used, for example, in a VTR or R-DAT, a signal between the rotary head and a fixed control system or necessary power is a so-called rotary transformer. Have been given and received through. This rotary transformer is a pair of opposed rotating bodies, each of which is provided with a copper winding of 10 to 20 turns of the required number of channels, and the main body material is NiZn ferrite.

Problems to be Solved by the Invention NiNz ferrite is a so-called highly precisely controlled electroceramics. However, since it is a sintered body, it is widely known that the magnetic characteristics change due to minute differences in the powder properties of the raw material. (Permeability, etc.)
It is strongly desired not only to improve the characteristics but also to reduce the variation in the characteristics. Further, since the rotating body is rotated at a high speed, the dimensional accuracy of the rotating body is required to be very high, for example, 10 mm ± 0.05 mm, whereas the ferrite, which is a sintered body, is finally achieved by polishing. However, chips, cracks, and other characteristic deterioration due to processing have occurred. For this reason, it is very difficult to use in the band of 20 MHz or higher.

On the other hand, the light emitting / receiving element 1 as shown in FIG.
It is conceivable that the rotary cylinder 2 is attached to the upper part of the rotary cylinder 2. In order to avoid the intensity of light due to the position change due to the rotation of the cylinder 2, the light emitting and receiving element 1 was installed near the rotation axis 3, and it was possible to receive and transmit signals sufficiently even at 20MHz or more, but from the external device. Noise (optical control equipment, etc.),
It was revealed that it was greatly affected by noise from the sun and other external light.

The present invention, when used in a high-density recording band of 20 MHz or more, uses an optical system that does not cause a problem such as a decrease in magnetic permeability or deterioration in accuracy, as in ferrite, and is further affected by noise due to external light as described above. It is intended to eliminate the influence and further downsize the device.

Means for Solving the Problems At least a pair of light emitting / receiving elements are installed in each of a rotating cylinder and a fixed cylinder, and an optical path between the light emitting / receiving elements is provided with a mirror surface having a rainbow-colored mirror surface and a rotary transformer. Electric power is supplied to the light emitting / receiving element on the rotating cylinder side via the, and signals are transmitted / received to / from the rotating head.

A pair of light emitting and receiving elements corresponding to the operation are on the opposite side of the central axis, and the optical signal from the scattering plate circulates even if it enters the shadow of the axis. In addition, the light emitting and receiving elements have the shortest distance (almost directly under each other,
Even if the light emitting element is located at a position directly above), a high-intensity optical signal does not directly enter and the scattered light is received by the scattering plate, so that stable operation is performed even in a light receiving and emitting element in a narrow operating region.

Also, outside light is shielded by the tape during the operation of a rotating cylinder, a fixed cylinder, and especially a recording device that needs to be shielded, in addition to the outer box that encloses the whole, so that noise is completely suppressed.

Further, since the rotary transformer is only for power supply, it can be easily manufactured without requiring strict magnetic characteristics and can be miniaturized. Further, when the light emitting / receiving element is installed outside the cylinder, an extra space is required in the upper part, and the size of the device is increased while the size of the device is increased.

Example A rotary cylinder unit having a structure shown in FIG. 1 and having a pair of light emitting / receiving elements 1a and 1A was prototyped. A red taiode was used as the light emitting body, a Pin type light receiving body was used as the light receiving body, and a rainbow-shining surface 4 obtained by mirror-scribing the bottom surface of the fixed cylinder 5 was used as the scattering plate 4. Magnetic head 8 is 30MH
The magnetic tape 6 has a laminated head in which 20 μm of a 1 μm thick amorphous metal (Co-Ta-Zr-Nb alloy) and 300 Å SiO ₂ insulating layers are alternately laminated, which operates in the z band.
An alloy tape was used which was vapor-deposited with a 00Å thick Co-Ni alloy.

The rotary transformer 7 has only one system for power supply, which is about 1/10 of the size of the conventional eight systems, and the fixed cylinder 5 automatically provides a large space in which light is scattered. Has been done. The light receiving / emitting body 1a and the IC circuit 9 for signal processing in the magnetic head 8 are housed in the space of the upper rotary cylinder 2 of the rotary body shown by the diagonal lines. Due to such a rational configuration, for example, the entire thickness of 2-3 mm corresponding to the height of the light emitting / receiving element 1 required for the configuration shown in FIG. I was able to make it thinner. Furthermore, 8
Compared to a rotary transformer with a system, the difference is even greater, and a reduction in thickness of about 10 mm has been achieved.

The recording and reproducing characteristics at 1 to 30MHz completely depend on the characteristics of the head tape, and it is experimentally confirmed that there is no loss Δ1 between the light emitting and receiving bodies 1a and 1A as shown in FIG. Was done. On the other hand, as in the past, the rotary transformer Δ
According to 2, it was found that the permeability of ferrite suddenly started to decrease, so that it began to be considerably attenuated at 7 MHz and almost no output was obtained at 20 MHz.

Further, a transmission test between the light emitting and receiving bodies 1a and 1A at 100 MHz was conducted. Since the prototype tape head system has a large attenuation, a signal is directly sent from the outside to the light emitting / receiving body 1a, the rotating cylinder 2 is rotated little by little, and the relative positions of the light emitting / receiving bodies 1a and 1A are changed. As a result, no deterioration of the 100 MHz digital signal was observed in any positional relationship.

On the other hand, when the light receiving and emitting body 1A, placed in a position such as to face the 1a, since the change of the light reception intensity is too large, even if how adjust the operating range of the light receiving and emitting element, the error rate is at best 10 ^{- 5}
It turned out to be very big. This is because, as is apparent from FIG. 2, due to the effect of the scattering plate 4 in the present invention, only the scattered light L ₁ or L ₂ reaches the receiver, and the direct light L ₀ is directed to the side opposite to the light receiver 1A. Even if incident, a considerable amount of scattered light L ₁ is re-reflected L ₂ by the cylinder wall 5 and reaches the light receiver 1A.
Even if the light L ₀ is directly incident on the side closer to the light receiver 1A, only a very small part of the strong primary scattered light L ₁ reaches the light receiver 1A. Therefore, regardless of the relative positional relationship of the light receiving and emitting body 1A1a, there is an excellent feature that the intensity of light reaching the light receiving body 1A does not change much, and the operating range of the light receiving and emitting body is narrowed to maintain high transfer characteristics. can do.

Next, the inside of the outer box containing the fixed cylinder unit shown in Fig. 1 is exposed to the outside light exposed to the outside light (blinking of sunlight, electric light, etc.) during the normal recording and reproducing operations with tapes applied. Became very bright and dark,
As shown in Fig. 1, the light emitting / receiving bodies 1a and 1A are upper and lower cylinders.
Since the gaps 2, 5 and the gap between them were almost completely shielded by the tape 6, no increase in noise due to outside light and no signal change were observed. On the other hand, in the configuration shown in FIG. 4, signal disturbance was observed instantaneously.

An example of a reflector is shown as the scattering plate, but a diffuser plate that transmits light also has the same effect.

EFFECTS OF THE INVENTION According to the present invention, it is possible to realize an excellent recording apparatus having a small digital rotary head that does not deteriorate signals even in a high frequency band of several tens of MHz, unlike a rotary transformer, and is resistant to noise. Although an example in which a magnetic head and a magnetic tape are used for the recording / reproducing unit is shown, it goes without saying that the same effect can be obtained in optical recording.

[Brief description of drawings]

FIG. 1 is a sectional view showing a recording apparatus in an embodiment of the present invention, FIG. 2 is a plan view showing signal transmission by light scattering in the present invention, and FIG. 3 is a characteristic of signal transmission in an embodiment of the present invention. FIG. 4 is a front view showing the outline of the conventional example. 1a, 1A …… Receiving and emitting element, 2 …… Rotating cylinder, 4 ……
Scattering plate, 5 ... Fixed cylinder, 6 ... Magnetic tape, 7
...... Rotary transformer, 8 …… Magnetic head.

Claims (1)

[Claims] 1. A light receiving and emitting element attached to each of said cylinders in a space at least partially surrounded by a rotating and fixed cylinder, and a mirror surface scribing is applied to an optical path between said light receiving and emitting elements. A recording which is provided with a rainbow-colored mirror surface and which is configured to supply power to the light receiving and emitting elements on the rotating cylinder side via a rotary transformer and output the output of the rotary head to the outside via the light emitting element and the light receiving element. apparatus.