JPS59207003A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To realize a magnetic recording and reproducing device where the inter-channel crosstalk is improved considerably by a simple change of shape by constituting individual channel parts of a rotary transformer independently of one another and arranging shield members beween channel parts. CONSTITUTION:A rotor-side rotary transformer 17 and a stator-side rotary transformer 18 are constituted in the first channel parts 17a and 18a and the second channel parts 17b and 18b independently of each other, and annular shield members 20 are provided between channel parts 17a, 17b, 18a and 18b. The annular shield members 20 are provided on a fixed cylinder 11 vertically upward to intercept air gaps 19 between rotor-side rotary transformer channel parts 17a and 17b and stator-side rotary transformer channel parts 18a and 18b. Further, a flange 13 provided for attaching a rotary cylinder 12 to a revolving shaft 14 is formed so as to cover all of the adhesion face of the rotor-side rotary transformer 17 to the flange 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic recording/reproducing device such as a VTR,
In particular, the present invention relates to a magnetic recording/reproducing device having a cylinder with an improved rotary transformer structure.

FIG. 1 is a longitudinal sectional view showing the cylinder structure of a conventional magnetic recording/reproducing device. In FIG. 1, this magnetic recording/reproducing apparatus includes a fixed cylinder 1 and a rotating cylinder 2, which are paired with each other. The rotating cylinder 2 is attached to a flange 3 by bolts 2a, 2b, and the flange 3 is fixed to a rotating shaft 4. The rotating shaft 4 is
It is rotatably supported by a pair of bearings 5.6. With such a configuration, the rotating cylinder 2 is rotated with respect to the fixed cylinder 1 by the rotational drive of the rotating shaft 4.

By the way, a rotor-side rotary transformer 7 is attached below the flange 3 on the rotary cylinder 2 side, and a stator-side rotary transformer 8 is attached to the fixed cylinder 2 on the other hand. An air gap 9 is formed between the rotor side rotary transformer 7 and the stator side rotary transformer 8.

The D-9 side rotary transformer 7 and the stator side rotary transformer 8 exchange signals from the rotary heads 2C, 2C attached to the rotary cylinder 2.

For example, in the cylinder structure shown in FIG. 1, when the number of channels of the rotary transformer is two, crosstalk occurring between the first channel and the second channel becomes a problem. Typically, this crosstalk is improved by forming a short ring in the middle between each channel.

However, since the first channel and the second channel are formed on the same core, there is a problem that the magnetic flux generated from each channel wets the other channel through the core. In addition, in order to prevent contact between the first channel and the second channel during rotation, the number of windings is reduced near the short ring, and therefore the air gap 6 is spaced apart from the space shown in FIG. It extends further to the point where each rotary transformer is embedded. Therefore, since the first channel and the second channel and the air gap of the short link part are on the same plane, magnetic flux leaks to the other channel through the gap of the short link part, causing crosstalk. was unavoidable.

For the above reasons, in a device that records different signals in each rotary head attached to the rotary cylinder 2, the signals applied to the first channel and the second channel are different, so the crosstalk that occurs between the channels can be ignored. I don't get it. In particular, in devices such as 8mm VTRs, where the tape winding angle around the rotary cylinder is 1800 degrees or more, and where one rotary head is in the recording state while the other rotary head is in the reproducing state, there is The difference in signal level is extremely large, for example, in the case of PCM signal recording and video signal reproduction, and therefore the crosstalk of the PCM recording signal to the video reproduction signal reaches a level that far exceeds the permissible limit.

One possible way to solve the above-mentioned problems is to stack two flat plate rotary transformers. However, this method has the disadvantage that the cylinder structure is large, that is, the height of the cylinder is high.

Therefore, it is an object of the present invention to provide a magnetic recording/reproducing device having a cylinder structure that eliminates the above-mentioned drawbacks and enables simultaneous transmission of recorded signals and reproduced signals without increasing the height of the cylinder portion. do.

To summarize, the present invention is a magnetic recording/reproducing device characterized in that each channel portion of a rotary transformer is constructed separately and independently, and a shield member is disposed in a space between each separated channel portion.

Other objects and features of the invention will become more apparent from the following description of embodiments with reference to the drawings.

FIG. 2 is a longitudinal sectional view showing a cylinder portion of an embodiment of the present invention, and corresponds to FIG. 1. Referring to FIG. 2, the feature of this embodiment is that the rotor side rotary transformer 17 and the stator side rotary transformer 18 are both connected to the first channel portions 17a, 18a and the second channel portions 17b, 18b. The channel portions 17a are configured to be separated and independent, and each of the separated channel portions 17a.

An annular shield member 20tfiffu is provided between 17b, 18a, and 18b. The other structure is the same as the cylinder structure of the conventional magnetic recording/reproducing apparatus shown in FIG. 1, so corresponding parts will be given corresponding reference numerals and their explanation will be omitted.

The annular shield member 20 is provided vertically upward from the fixed cylinder 11, and includes rotor-side rotary transformers 17a, 17b, stator-side rotary transformer 18a,
18b is blocked. Further, in this embodiment, the seven flange 13 for attaching the rotating cylinder 12 to the rotating shaft 14 is formed so as to cover the entire adhesive surface of the rotor-side rotary transformer 17 to the seven flange 13.

Since it has the structure as described above, in the cylinder structure of this embodiment, the first channel portion 17a.

From the core of 18a, a second channel portion 17b.

The leakage magnetic flux to the core of 18b is caused by the annular shield member 20
Furthermore, even in the air gap 19 between both channels, there is an annular shield member 2 between both channels.
0, the magnetic flux leaking through this air gap portion 19 is also greatly attenuated.

FIG. 3 shows the cylinder structure of the embodiment shown in FIG.
FIG. 3 is a longitudinal cross-sectional view with the flat rotary transformer removed. The structural features of the embodiment shown in FIG. 2 described above are as follows:
This will be explained in more detail with reference to FIG. In the embodiment shown in FIG. 2, in addition to the rotary transformers 17 and 18 being configured separately and independently for each channel, the flange 13 is arranged outwardly so as to cover the entire surface of the rotor-side rotary transformer 17 as described above. It is characterized in that it has an extension portion 13a, and that the annular shield member 20 is provided upright upward from the fixed cylinder 11. It is known that the above-described effects can be reliably achieved if the distance @a between the upper end of the annular shield member 2o and the lower surface of the flange 13 is less than Q, 5 mon. Further, the width and height C of the annular shield member 20 are approximately 1 mm and 4 mm, respectively, and it is possible to easily process the annular shield member 20 to these extents.

FIG. 4 is a longitudinal sectional view showing another embodiment of the invention. As is clear from FIG. 4, in this embodiment, the annular shield member 20 has a higher height and protrudes above the main surface of the lower surface of the flange 13. A groove 13b is formed on the lower surface of the holder.

In this way, by increasing the height of the annular shield member 20, crosstalk can be further improved.

FIG. 5 shows yet another embodiment of the invention.

FIG. Here, the conductive shield member 21a
, 21b are the rotor-side rotary transformers 17a, 1 in advance.
7b and stator side rotary transformer 18a, 18b
and are each combined and integrated. Each rotary transformer 17a, 17b divided by this,
The surface precision of the opposing surfaces of 18a and 18b is further improved, and the precision of the rotary transformer is improved. Further, the annular shield member '20 is adhesively fixed in an upright position upward from the conductive shield member'2111 attached to the stator side. Therefore, similarly to each of the above-mentioned embodiments,
Crosstalk between each channel can be improved by the function of the annular shield member 20.

In this way, in the embodiment shown in FIG. 5, the conventional fixed cylinder 11 and flange 13 can be used as they are, and the above-mentioned structure can be achieved by simply gluing the conductive shield members 21a, 21b and the annular shield member 21. The same effects as in each embodiment can be achieved.

In addition, in each of the above-mentioned embodiments, the flat rotary transformer 1
Although 7.18 has been described, it should be pointed out that the same effect can be achieved even when a cylindrical rotary transformer is used instead. Further, although all the annular shield members 21 were provided on the core support stand on the stator side, they do not necessarily need to be provided on the stator side, and may be provided on the rotor side.

Further, the annular shield members may be provided on both the rotor side and the stator side, in which case the annular shield members are configured such that their tips are opposed to each other. Further, in the above-described embodiments, all cylinders having a two-channel type rotary transformer have been described, but it should be pointed out that the present invention can also be applied to other multi-channel rotary transformers.

As described above, according to the present invention, each channel section of the rotary transformer is configured separately and independently, and the shield member is arranged in the space between each separated channel section.
By simply changing the shape, the crosstalk between the channels can be significantly improved, and it is therefore possible to realize a magnetic recording/reproducing device having a cylinder equipped with a rotary transformer with excellent crosstalk characteristics.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a cylinder structure in a conventional magnetic recording/reproducing device. FIG. 2 is a longitudinal section of a cylinder structure according to an embodiment of the present invention. FIG. 3 is a longitudinal sectional view showing the embodiment shown in FIG. 2 with only the rotary transformer portion removed. Fourth
The figure is a longitudinal sectional view of a cylinder structure according to another embodiment of the invention. FIG. 5 is a longitudinal sectional view of a cylinder structure according to still another embodiment of the present invention. In the figure, 11 is a fixed cylinder, 12 is a rotating cylinder, 12C is a rotating head, 17 is a rotor-side rotary transformer,] 7a is a first channel portion of the rotor-side rotary transformer, 17b is a second channel portion of the rotor-side rotary transformer, 18 is a stator side rotary transformer, 18
Reference numeral a indicates a first channel portion of the stator side rotary transformer, 18b indicates a second channel portion of the stator side rotary transformer, and 20 indicates a circular shield member. Agent Masuo Oiwa 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure procedural amendment (voluntary) Showa 5 (August 25, 2, title of invention: magnetic recording and reproducing device 3, representative of the person making the amendment) To Hitoshi Katayama, Department 4, Agent 5, Detailed Description of the Invention column of the specification subject to amendment and the full text of the drawings 6, Contents of the amendment (1) "Rotating head 20. 2
04 is corrected to "rotary head 2C92d". (2) “Also,” on page 3, lines 11 to 14 of the specification
``The number of windings is reduced in both the rotating first channel and the rotating first channel...''. To prevent the winding from protruding beyond the end face of the core, the winding is slightly lower than the end face of the core. (3) The phrase ``therefore'' on page 3, line 17 of the specification is amended to ``also''. (4) In the first line of page 8 of the specification, the phrase ``If it is this size, it can be easily processed'' has been changed to ``If it is this size, 20 can be easily processed into an 11 structure.'' Correct to "Processing". (5) Amend the entire text of the drawing as shown in the attached sheet. Above Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) In a magnetic recording/reproducing device having a cylinder including a rotary head that receives and transfers signals to and from a magnetic tape, and a multi-channel rotary transformer that transmits and receives signals from the rotary head, each of the rotary transformers 1. A magnetic recording and reproducing device, characterized in that channel portions are formed separately and independently, and a shield member is disposed in a space between each separated channel portion. (2) The magnetic recording and reproducing device according to claim 1, wherein the shield member is an annular shield member.