JPS60229201A - Rotating transformer wiring circuit - Google Patents

Abstract

PURPOSE:To reduce the deterioration of screen due to deterioration in performance of a rotary tranformer caused by variance in the size of core slot diameter by connecting a head for standard reproduction having a large output to a position corresponding to a slot postion with a large inner diameter of the rotary transformer. CONSTITUTION:The diameter of the rotary transformer transmitting a signal is large and the difference between the outer diameter and the inner diameter required >=30mm., in a rotary head drum using video heads 16-19 and FM audio heads 12, 15. Further, the number of coils transmitting the signal is 7 for each head and short-rings A, B are required, 9 slots are require for a ferrite core 8, the outer diameter phiD is 50mm. when the inner diameter of the rotary transformer is 20mm. and the variance in the size of core slots when the core 8 is formed by sintering gives much effect on the performance of signal transmission. On the other hand, the width of the video track is large to the tape in the video recording and reproduction in the standard speed and the C/N of the heads is larger, the slots 3, 4 of the rotary transformer are provided with video heads 19b, 17 for long time video recording and reproduction and the video heads of standard speed are used for the slots of the transformer at the outermost peripheral.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a connection circuit for a rotary transformer that minimizes deterioration in image quality during long-term recording and playback by connecting a pair of rotary transformers, particularly to the head of a large-diameter rotary transformer. .

[Background of the invention]

The rotary transformer used in conventional FM audio and video head configurations for standard-speed, long-time speed recording and playback has a large diameter, so it cannot be integrated into one, requiring two pairs of transformers: an audio transformer and a video transformer. It was.

[Purpose of the invention]

An object of the present invention is to provide a wiring circuit for a rotary transformer that minimizes screen deterioration due to performance deterioration of the rotary transformer caused by variations in core groove diameter dimensions during sintering and forming of the ferrite core of a large-diameter rotary transformer. be.

[Summary of the invention]

Generally, the internal diameter φdX of a mineral transformer varies in size during sintering and forming a ferrite core, and as φd increases, the dimensional variation increases and performance deteriorates during mass production.

Therefore, the present invention achieves the above object by connecting a standard playback head with a large output to a position corresponding to a groove position with a large φd.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. FIG. 1 is a view of the rotating head drum viewed from above, and shows the video heads 16, 18, 19a19b, ', 17.
and FM audio head 12.15 are installed respectively. In a rotary head drum that uses a large number of heads or records and reproduces signals for different purposes, such as a video head and an FM audio head, a rotary transformer 8.9 that transmits the signals is used. In order to achieve the above-mentioned head configuration, that is, a rotary head drum having a large diameter head as shown in Fig. 2, which has heads for standard playback, long-time recording and playback, and FM audio, it is necessary to For a rotating transformer, the outer diameter of the transformer is φD, and the inner diameter is φd.
Then, D−d must be at least 3011 or more.

The transformer is shown in Fig. 5, and in the head configuration described above, the number of coils for transmitting signals and the number of winding grooves of the ferrite core 8 are 7, which corresponds to the number of coils for each head, and the audio head (A) and the audio head. Requires jaw lifters A and B to prevent signal crosstalk between the video and the video (B),
As a result, the ferrite core 8 requires nine grooves, and since the inner diameter of the rotary transformer is 20 mm, the outer diameter must be at least 50 mm. However, in such a large-diameter transformer, dimensional variations in the core grooves 8B and 9a during sintering and forming of the ferrite core 8 greatly affect the transmission performance of the transformer. Generally, the groove diameter dimension is d=kXdo. However, d: groove diameter variation, tio: ideal diameter, ni: mass production variation ((18~1
2%).

Therefore, as shown in FIG. 6, the grooves of the rotary transformer 8 (rotating side) and the rotary transformer 9 (fixed side) are shifted by e. This amount of deviation is the ideal diameter d.

The larger the actual diameter variation d. is, the larger is the coupling inductance of the transformer, and the cedar is the leakage inductance of the transformer). When eAN increases with respect to the groove width W and the groove deviation amount e, the performance deteriorates. This is a very disadvantageous point for large diameter multi-groove transformers.

However, in the above-mentioned rotating drum using a large number of heads, it is common that there are heads all around the circumference in the standard recording/playback mode and the long-term recording/playback mode, each suitable for the purpose of use. In other words, as shown in FIG. 5, when recording and playing back at standard speed, the width T+ of the video track 16 becomes larger than that of the chip 15, and as shown in FIG. Become. Therefore, the C/N ratio of the head becomes larger during standard speed playback than during long-time recording playback.

Therefore, in the present invention, as shown in FIG.
The problem is solved by using 4t. In other words, the inner diameter φ2
In the case of a transformer having a diameter larger than 0 and larger than the outer diameter φ5o, a standard speed video head must be used for the outermost transformer groove. Also, as shown in Figure 9, a head configuration in which a standard-speed recording/playback head and a long-time recording/playback head are simultaneously attached to the head mounting plate can be considered, but in this case as well, the outermost coil is set to the standard-speed recording/playback head. A recording/playback head must be installed.

〔Effect of the invention〕

According to the present invention, it is possible to provide a rotary transformer connection method that is efficient especially in long-term recording and reproduction, and has the effect of reducing variations in mass production.

[Brief explanation of drawings]

Figure 1 is a top perspective view of the rotary head drum, Figure 2 is a sectional view of the main parts of the rotary head drum, Figure 5 is a magnetic tape pattern diagram, Figure 5 is a front view of the rotary transformer, and Figure 6 is a diagram of the magnetic tape pattern. 7 is a detailed diagram of the sectional groove of the rotary transformer, FIG. 7 is a characteristic graph, FIG. 8 is a circuit diagram, and FIG. 9 is a top perspective view of the rotary head drum. 1.2...FM audio transformer groove (coil) A,
B... Short ring 5-7... Video transformer groove (coil) 8... Rotating transformer (rotating side) 9... Rotating transformer (fixed side) 12, 15... FM audio head 16-21・・・
・Video head T-bi...Standard speed track T2... Long distance track Fig. 1 8 Chrysanthemum 2 Fig. 9f53 Fig. 4 M Fig. 5 Fig. 6 Sister Fig. 7 (lK) 0 0.1Q2 Q3 Q40506 Q7 Q809
(+) Figure 8 Procedural Amendment (Spontaneous) Patent Application No. 85779 filed in 1982 Title of the invention Relationship to the case of a person who corrects the connection circuit of a rotating transformer Name of patent applicant Title fsIQ1 Co., Ltd. Hitachi, Ltd. Representative
The details of the person correction are as shown in the attached sheet. Claims: A rotary head drum that is equipped with an FM audio head and a video head for standard and long-time modes, and has the function of superimposing and recording a video signal on an audio signal recording track. In a magnetic recording and reproducing device capable of recording and reproducing simultaneously using an integrated rotating transformer, the difference between the outer diameter and inner diameter of the rotating transformer is small (both have a diameter of somm or more and the maximum outer diameter is P40rrm or more, and A rotary transformer having at least seven windings including a short ring and a power transmission wire winding, and a head with a large track width among the recording heads in the above standard mode is connected to the power transmission M winding located at the outermost circumference of the rotary transformer. A rotating transformer connection circuit characterized by being connected to a wire.

Claims (1)

[Claims] The rotary head drum is equipped with an FM audio head and a video head for standard and long-time modes, and has the function of superimposing a video signal on the order/f-o signal recording track. In a magnetic recording and reproducing device capable of simultaneously recording and reproducing signals using an integrated rotary transformer, the rotary transformer has a difference between an outer diameter and an inner diameter of at least 1 wm and a maximum outer diameter of φ40 m or more, and , a rotary transformer having at least eight or more windings including two short rings and a power transmission wire winding, with the recording head in the standard mode having a larger track width located at the outermost circumference of the rotary transformer. A rotating transformer connection circuit characterized by being connected to a power transmission wire winding.