JPH03248313A - Rotary head assembly for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain prescribed accuracy with a low cost by directly connecting a magnetic head to a relay substrate on a rotational side rotary transformer with a signal wire. CONSTITUTION:A pattern 141 is printed on the relay substrate 14A mounted on the upper plane of the rotational side rotary transformer 902, and also, the other end of each pattern 141 is connected to the rotational side rotary transformer 902 with the signal wire 15. The magnetic head 7 is directly connected to the relay substrate 14A on the rotational side rotary transformer 902 with the signal wire. Therefore, no relay substrate on a rotary cylinder 5 and hole to insert the signal wire to be connected to the substrate are required. Thereby, the number of process and a cost can be reduced and also, the accuracy of the rotary cylinder 5 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head assembly of a magnetic recording/reproducing apparatus such as a video tape recorder or a digital audio recorder, and particularly to simplifying the structure of the rotary cylinder thereof.

[Conventional technology]

Fig. 6 is a plan view of a rotary head assembly of a conventional magnetic recording/reproducing device, Fig. 7 is a longitudinal cross-sectional view taken along the line ■-■ in Fig. 6, and Fig. 8 shows the main body of the rotating cylinder in Fig. 7. FIG. 2 is a vertical cross-sectional view showing a state before signal lines are connected.

In the figure, (1) shows the magnetic tape, and (2) shows the lead groove (201) that guides the running of the magnetic tape (1) on the outer peripheral surface (
(202) has a fixed cylinder; (3) is a central shaft provided at the center of the fixed cylinder (2) and rotatably supported from the fixed cylinder (2) via a bearing (4); (5);
is a rotary cylinder fixed to the center shaft (3), and includes a flange portion (501) fixed to the center shaft (3) by appropriate means such as press fitting or shrink fit, and this flange portion (
The main body (50
2) It consists of. (The force is a magnetic head for recording information on the magnetic tape (1) or reproducing information already recorded on the magnetic tape (1), and the screw (8)
) is attached to the main body (502) of the rotating cylinder (5). (9) is a rotary transformer for contactlessly transmitting and receiving information between the magnetic head (force) and a signal processing circuit (not shown) on the stationary side;
) and a rotating rotary transformer (902) fixed to the rotating cylinder (5). (10) is a motor that rotationally drives the rotating cylinder (5).

(11) is a relay board provided on the top surface of the rotating cylinder (5), (12) is a signal line connected to the magnetic head (7) at one end; Line (1
A pattern (111) for soldering 2) is printed. (13) is a signal line whose one end is soldered to pattern (111), and (14) is a rotating side rotary transformer (
This relay board (14) has a pattern (not shown) printed on it, and one end is connected to the rotating side rotary transformer (902) by a signal line (15). It is connected. The other end of the signal line (13) is soldered to the other end of the pattern on the relay board (14), and thus the magnetic head (force) is connected to the signal line (12) and the pattern (11) on the relay board (11).
1), the signal line (13), the pattern on the relay board (14), and the signal line (15) to the rotating side rotor IJ.
) is electrically connected to the lance (902).

Therefore, the main body (502) of the rotating cylinder (5) has a hole (503) for fitting and positioning it into the flange (501), and a screw insertion hole (504) for the screw (6). ), a screw hole (505) for the screw (8), a hole (506) for passing the signal line (12), and a hole (507) for passing the signal line (13). In addition to these holes, holes (not shown) for a jig used for positioning the magnetic head (7) are also usually provided. In addition, (508) is a rotating cylinder (5)
Next, the operation of the rotary head assembly will be explained. When the rotary cylinder (5) is rotated by the motor (lO), the magnetic head (7) also rotates around the central axis (3), and is guided along the IJ-do groove (201) to the fixed cylinder (2). and the outer peripheral surface (2) of the rotating cylinder (5).
02) (508) Magnetic tape running on fl)
Record and play back information.

At this time, the information recorded or reproduced is the rotary transformer (9), the signal line (15), the pattern on the relay board (14), the signal line (13), the pattern (111) on the relay board (11), and the signal Data is exchanged between the magnetic head (7) and the signal processing circuit via the line (12).

Generally, there are cutting methods and molding methods for forming the above-mentioned rotating cylinder (5).

In the case of the cutting method, the material is cut into a predetermined external shape, and the hole (503) as described above is formed.

Holes for positioning jigs for (504), (505), (506), (507) and the magnetic head (7) are also cut. In addition, when using the molding method, bottles for forming the holes (503) to (507) and jig holes are formed in the mold, and a suitable material such as resin is filled in the mold. Injecting the molding material O By the way, molded products are generally made by injecting the molten molding material into a mold whose temperature is controlled below the solidification temperature of the molding material. In the area farthest from the mold, the amount of heat released by the molding material into the mold while flowing in the mold is large, the temperature drop is large, and the inside solidifies quickly.

Similarly, even at the part far from the gate where molding materials injected from other gates meet, the leading edges of the molding material flows with a significant temperature drop touch, so the two flows do not mix sufficiently and solidify to the inside quickly. , a so-called weld occurs. Therefore, in these parts, the amount of supplementary molding material to compensate for shrinkage due to cooling is small, and the density is low, so the amount of shrinkage of the molded product is large. On the other hand, in the area near the gate, the temperature drop is small and it is slow to solidify to the inside, so until the gate is closed by cooling and solidifying, supplementary filling of molding material is performed to compensate for the shrinkage due to cooling, so the density decreases. As the temperature increases, the amount of shrinkage of the molded product decreases.

It is well known that even when a bottle is formed in the mold, a flow of one molding material is divided into two flows by the bottle, so a weld occurs at the part where the two flow on the downstream side of the bottle.

[Problem to be solved by the invention]

As mentioned above, the rotary cylinder of a conventional rotary head assembly requires many holes, so when forming the rotary cylinder by cutting, it is necessary to precisely machine many holes. There is the problem of increased costs due to the increase in the number of steps, and when forming by molding, the structure of the mold becomes complicated due to the need to form a bottle in the mold, resulting in increased costs and In addition to the problem of deterioration of accuracy due to welds that occur around many holes, there are also problems such as an increase in cost because two relay boards and many signal lines are required.

This invention was made in order to solve the problems of the conventional ones, and even if formed by any processing method such as cutting or molding, it can achieve the specified precision at a lower cost than the conventional ones. It is an object of the present invention to provide a rotary head assembly for a magnetic recording/reproducing device equipped with a rotary cylinder as obtained.

[Means to solve the problem]

A rotary head assembly for a magnetic recording/reproducing apparatus according to the present invention has a magnetic head directly connected to a relay board provided on a rotating side rotary transformer by a signal line.

[For production]

In the rotary head assembly configured as described above, the connection between the magnetic head and the rotary transformer on the rotating side is made without going through the relay board on the top surface of the rotary cylinder. No wires are required, and therefore no holes need to be formed in the rotating cylinder for passing such signal wires.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a plan view showing the main body of a rotary cylinder of a rotary head assembly according to an embodiment of the present invention, and FIG. 2 is a vertical cross-section of the entire rotary head assembly taken along the line ■-■ in FIG. 3 are longitudinal cross-sectional views of only the main body of the rotary cylinder shown in FIG. 2, and the same parts as in the conventional one are designated by the same reference numerals and their explanation will be omitted.

In the figure, (14A) is a relay board corresponding to (14) of the conventional one, and the rotating side rotary transformer (90
2), and this relay board (14A
) has a pattern (141) printed on it. (1
6) is a signal line that connects the magnetic head (7) to one end of the pattern (141), and the other end of each pattern (141) is connected to the rotating side rotary transformer (90) by a signal line (15).
2) is connected to. (17) is the rotating cylinder t5J
a presser plate (18) that covers the top surface of the main body (502) of the
is screwed into the screw hole (301) formed at the shaft end of the central shaft (3) and presses the holding plate (17) toward the main body (502), thereby pushing the main body (502) into the flange ( so
1) This is a screw to be fixed to. In this embodiment, the magnetic head (force) is fixed to the flange portion (501).

In this way, the magnetic head (7) is connected to the relay board (1) on the rotary transformer (902) by the signal line (16).
4A), the relay board (11) on the top surface of the rotating cylinder (5) and the signal lines (12) and (13) connected thereto are no longer necessary, and therefore these signal lines can be (12), (13) through the hole (5
06) and (507) are also unnecessary. Therefore, when forming the rotary cylinder (5) by the cutting method, cutting of the holes (506) and (507) is not necessary, which reduces the number of processing steps and costs. In addition, when forming by molding method, holes (
It is no longer necessary to form bottles for forming holes (506) and (507) in the mold, which not only simplifies the structure of the public mold and reduces costs, but also reduces the number of holes (506) and (507).
07), the occurrence of welds around the cylinder (5) is also eliminated, and the accuracy of the rotating cylinder (5) is improved.

Moreover, the relay board (11) and the signal lines (12), (1
Since 3) is no longer necessary, the number of parts is reduced and costs are further reduced.

In addition, as in the illustrated embodiment, the main body (502) is attached by using the central shaft (3) and the presser plate (17) and screws (18).
By fixing the screw to the flange portion (501), the screw hole (504) for the screw (6) of the conventional one becomes unnecessary.

Furthermore, if the magnetic head (7) is attached to the flange portion (501) as in the illustrated embodiment, the magnetic head (7) can be attached to the flange (501).
The positioning of 7) should be done from the outside using a jig after attaching this to the flange part (501) using the screws (8) and before fixing the main body part (502) to the flange part (501). This eliminates the need for screw holes (SOS) and jig holes. In this way, the outer peripheral surface (50
8) Main body part (502) that requires high precision in roundness, etc.
In this case, it is sufficient to form only the center hole (503) for fitting into the flange portion (501), thereby achieving a reduction in the cost of the layer and an improvement in precision particularly during molding.

In the embodiment described above, the hole (50
3) is formed by penetrating with a constant diameter in the wall thickness direction,
Depending on the mounting structure to the flange portion (501), it may be formed as a through hole whose diameter changes in the thickness direction as shown in Fig. 4, or it may be formed as a blind hole as shown in Fig. 5. You may do so. In the case of a blind hole, this portion can be fixed to the flange portion (501) by adhesive or the like.

Of course, the ones shown in FIGS. 3 and 4 can also be fixed to the flange portion (501) by adhesive or the like.

Furthermore, in the above embodiment, the hole (503) for fitting the main body (502) to the flange (501) was formed at the center of rotation, but depending on the mounting structure of the main body (502), It may be formed at a location other than the center of rotation,
Its shape is not limited to circular, but may be other shapes. Moreover, although the example in which the holes (503) are formed only at one location is shown, the structure may be such that the holes (503) are formed at multiple locations and attached.

Furthermore, although an example is shown in which the main body part (502) is attached to the flange part (501), if the central axis (3) rotates, it may be attached to any rotating part, such as attached to the central axis (3). It may be of. Furthermore, although an example has been shown in which the magnetic head is attached to the flange portion (501), it may be attached to the main body portion (502) with a predetermined precision by gluing, soldering, etc.

It goes without saying that the present invention is not limited to forming rotary cylinders by cutting or molding methods, but can be applied to objects formed by any other method.

〔Effect of the invention〕

As described above, according to the present invention, by using an extremely simple configuration in which the magnetic head is directly connected to the relay board on the rotating side rotary transformer by a signal line, a rotating cylinder with a predetermined accuracy can be produced at a lower cost than the conventional one. The advantage is that a rotary head assembly for a magnetic recording and reproducing device equipped with the following can be obtained.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the main body of a rotary cylinder of a rotary head assembly of a magnetic recording/reproducing device according to an embodiment of the present invention, and FIG. 2 is a plan view of the rotary head taken along the line ■-■ in FIG. 3 is a vertical sectional view of only the main body of the rotating cylinder of the one shown in FIG. 2; FIGS. 4 and 5 are views showing modified examples of the main body of the rotating cylinder, respectively; Fig. 6 is a plan view of a rotary head assembly of a conventional magnetic recording/reproducing device, Fig. 7 is a longitudinal cross-sectional view taken along the line ■-■ in Fig. 6, and Fig. 8 shows the main body of the rotating cylinder in Fig. 7. FIG. 2 is a vertical cross-sectional view showing a state before signal lines are connected. In the figure, (1) is the magnetic tape, (2) is the fixed cylinder, (202) is its outer circumferential surface, (3) is the central axis, (4)
is a bearing, (5) is a rotating cylinder, (7) is a magnetic head,
(9) is a rotary transformer, (901) is a fixed side rotary transformer, (902) is a rotating side rotary transformer, (
14A) is a relay board, and (15) and (16) are signal lines, respectively. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A rotary head assembly for a magnetic recording and reproducing device that records and reproduces information on a magnetic tape, which includes a fixed cylinder having an outer peripheral surface that guides the running of the magnetic tape, and rotation from the fixed cylinder via a central shaft and a bearing. a rotating cylinder that supports a magnetic head that records and reproduces information on the magnetic tape; a fixed rotary transformer that is fixed to the fixed cylinder; and a rotating rotary transformer that is fixed to the rotary cylinder. A rotary transformer for transmitting and receiving information between the head and a stationary side signal processing circuit without contact; and a rotary transformer provided on the rotating side rotary transformer to connect the rotating side rotary transformer and the magnetic head. 1. A rotary head assembly for a magnetic recording/reproducing apparatus, comprising a relay board connected thereto, wherein the magnetic head is directly connected to the relay board via a signal line.