JPH04370517A - Rotary drum device - Google Patents

Abstract

PURPOSE:To improve assembling precision by making it possible to fix a magnetic head after assembling a core to be a fitting standard. CONSTITUTION:At the time of the assembling of a head driving device, the magnetic head 1 and a head supporting plate 2 are fixed to each other, and the supporting plate 2 and a coil bobbin 5 are fixed temporarily to each other, and components except a magnet 7b and the core 6e are assembled. The reference plane of the core 6c is fixed, and the head 1 is fixed while its inclination is watched, and is fixed to the bobbin 5 through the hole of the core 6c. After that, the fixed assembly of the magnet 7b and the core 6e is fixed to the core 6c. Thus, since the head 1 can be fixed after the core 6c of the fitting standard is assembled, the assembling precision is improved, and since a material other than a spring can be selected for the head supporting plate 2, resonance frequency jointed with the supporting plate can be changed, and in the case of a combination head, the inclining of the heads to each other can be suppressed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating drum device equipped with a head drive device.

0002

2. Description of the Related Art FIGS. 8 to 10 are a partially cutaway front view, a plan view, and a side sectional view of a conventional head driving device. In the figure, 1 is a magnetic head, 3a is a flexible board that transmits signals to the magnetic head, 3b is a flexible board that sends current to a coil, 4a is a gimbal spring on the magnetic head side, 4b is the other gimbal spring, and 5 is a coil 5a wound around it. Detailed views of the installed coil bobbin are shown in FIGS. 11 and 12. 6a, 6
b and 6c are cores that support gimbal springs 4a and 4b made of magnetic material, 7a and 7b are a pair of magnets, 8 is a pole piece made of magnetic material that guides a magnetic path, and xa and xb are magnets that flow through the head drive device. It is a road. FIG. 7 is a partial sectional view of a rotating drum equipped with a head drive device, and in the figure,
9 is a head drive device, 10 is a substrate, 11 is a slip ring, 12 is a brush, 13 is a rotating upper drum, 14 is a fixed lower drum, 15a is a rotating upper drum 13
15b is a rotary transformer attached to the fixed lower drum 14, 16 is a signal board that transmits signals to the rotary transformers 15a and 15b, and 17 is a board 10 on the upper drum 13 and the rotary transformer. These are signal pins that transmit signals to the transformers 15a and 15b.

Next, the operation will be explained. A pair of permanent magnets 7a, 7b, pole piece 8, and cores 6a, 6b, 6c
As a result, a magnetic circuit of xa and xb is formed. When a current flows through the coil 5a from the flexible substrate 3b, the bobbin 5 moves in the direction of the central axis according to Fleming's left hand rule. Since the coil bobbin 5 is supported via the gimbal springs 4a and 4b, its operation is proportional to the amount of current and can move vertically, allowing the magnetic head 1 fixed to the gimbal spring 4a to be displaced in the direction of the central axis without tilting. . As shown in FIG. 7, in the rotating drum, drive currents ya, yb, and yc pass through the brushes 12, the rotating slip ring 11, and the substrate 10, and reach the flexible substrates 3a and 3b. On the other hand, signals from the magnetic tape are sent to the magnetic head 1 and the flexible substrate 3.
a, board 10, signal pin 17, rotary transformer 15
reach a. The signal is transmitted by electromagnetic induction from the rotating rotary transformer 15a to the fixed rotary transformer 15b, and is directed to the circuit system via the signal board 16.

0004

[Problems to be Solved by the Invention] In the conventional head drive device of a rotating drum device, the magnetic head 1 and the gimbal spring 4a are integrated, so that the inclination of the magnetic head is kept constant and the gimbal spring 4a has high precision. is required, and Figure 1
As shown in the exploded view of the head drive device shown in No. 3, there was a problem in that the product was defective after the last core 6c was installed when the head drive device was assembled.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a head drive device that can fix the tilt of a magnetic head and reduce tilt defects.

[0006]

A head drive device according to the present invention includes a coil bobbin supported via a spring member, and a magnetic head supported by the coil bobbin via a head support plate.

[0007]

[Operation] In the head driving device of the present invention, a member other than a spring material can be used for the head support plate, and the magnetic head can be tilted stably. Furthermore, even if high accuracy is not required, a good product can be obtained through final adjustment.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, 1 is a magnetic head, 2 is a head support plate, 6d is a core for fixing a gimbal spring 4a, and 6e is a magnetic head.
is a core that closes at the final time and is attached to the opening of the core 6c. Since the other symbols are the same as those in FIGS. 8 to 10, the same symbols are given and the explanation will be omitted.

FIG. 6 is an exploded view of the head driving device,
When assembling this head drive device, the magnetic head 1 and the head support plate 2 are fixed, the head support plate 2 and the coil bobbin 5 are temporarily attached, and the components other than the magnet 7b and the core 6e are assembled. core 6
The reference plane c is fixed, and the magnetic head 1 is fixed while checking the inclination thereof, and the coil bobbin 5 is fixed through the hole in the core 6c. Thereafter, the magnet 7b and the core 6e are fixed to the core 6c for assembly.

0010

[Effects of the Invention] As described above, according to the present invention, since the magnetic head can be fixed after the core is assembled as a reference for mounting, the assembly precision of the device is improved and the precision of the parts is not required as much. Therefore, it has the effect of being able to be manufactured at low cost. Furthermore, since materials other than spring materials can be selected for the magnetic head support plate, the resonance frequency of the support plate can be changed, and in the case of a combination head, there is also the effect that mutual inclination can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a head driving device showing an embodiment of the present invention.

FIG. 2 is a plan view of the head driving device.

FIG. 3 is a side sectional view of the head driving device.

FIG. 4 is a detailed plan view of the head support section of the head drive device.

FIG. 5 is a plan view of a gimbal spring.

FIG. 6 is an exploded view of the head driving device.

FIG. 7 is a partial cross-sectional view of a conventional rotating drum device.

FIG. 8 is a partial sectional view of a conventional head driving device.

FIG. 9 is a plan view of the head driving device.

FIG. 10 is a side sectional view of the head driving device.

FIG. 11 is a plan view of a conventional head support section.

FIG. 12 is a side sectional view as well.

FIG. 13 is an exploded view of a conventional head driving device.

[Explanation of symbols]

1 Magnetic head 2 Head support plates 3a, 3b Flexible substrates 4a, 4b Gimbal spring 5 Coil bobbin 5a Coils 6a to 6e Cores 7a, 7b Magnet 8 Pole piece 9 Head drive device 10 Substrate 11 Slip ring 12 Brush 13 Upper drum 14 Lower drum 15a , 15b Rotary transformer 16 Signal board 17 Signal pin

Claims (1)

[Claims] 1. A rotating drum device having a drive device comprising a coil bobbin supported via a spring member and a magnetic head supported by the coil bobbin via a head support plate.