JPS6020356A - Both-surface contacting type floppy head device - Google Patents

Abstract

PURPOSE:To prevent a resonance phenomenon by making the length of the contacting surface of a side-1 head supported on a gimbals having small elastic force smaller than that of a side-0 head supported on a gimbals having large elastic force. CONSTITUTION:The side-1 head 13 and side-0 head 15 over and under a floppy disk 11 are in position relation as shown in a figure. The side-0 head 15 is supported by the side-0 gimbals. The side-1 head 13 has a groove 17 in the tangential direction of the disk 11 on its contacting surface with the floppy disk 11. Then, the length (in the tangential direction of the floppy disk 11) la1 of the head core of the side-1 head 13 and the length la0 of the head core of the side- 0 head 15 are so set that la1>la0. Further, the length (in the tangential direction of the floppy disk 11) of the contacting surface of the side-1 head 13 and the length lb0 of the contacting surface of the side-0 head 15 are so fixed that lb1>lb0.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a double-sided contact type floppy head device.

[Technical background of the invention]

In a magnetic recording device using a floppy disk, 1
A double-sided contact type floppy head device is known in which a pair of floppy heads are provided facing each other, are brought into contact with both sides of a floppy disk at the same time, and either head is used alternately by switching on the control circuit side. . In the glazing floppy device, the upper head is generally called the side 1 head and the lower head is called the side 0 head. In addition, both heads are supported by gimbals made of leaf springs, but generally the gimbal that supports the lower side 0 head (side 0 gimbal) is also supported by a gimbal made of a leaf spring.
Gin noll supporting the upper Side 1 head (Side 1
The elastic force of the gimbal is similar, and the side l gimbal is more flexible.

By the way, there are the following two types of double-sided contact type floppy head devices.

One of them is to make both the side 1 head and the side 0 head the same shape and size.

The other method is to use a core with no grooves on the contact surface incorporated into the housing for the side 0 head, and use a core with grooves on the contact surface without incorporating it into the housing for the side 1 head. However, the present invention is directed to the latter.

In this type, as shown in Fig. 1, the relationship between the head core length Aal of the side l head l and the head core length taO of the side l head 2 is r tal (taOJ,
As shown in FIG. 2, the relationship between the length tbl of the contact surface of the side 1 head 1 and the length tbo of the contact surface of the side 0 head 2 is r,7bl (as tbOJ, on the contact surface of the side 0 head 2, The side l was configured to rest on the contact surface of the head l.

[Problems with background technology]

In such a conventional device, it is extremely important to ensure that the contact surface of the side O-head 2 contacts the floppy disk. Therefore, the parallelism of the side 0 head 2 with respect to the floppy disk is strictly required. Therefore, strict requirements are placed on the parallelism with the side l head 1, and the side l gimbal is also required to have equal elastic force in both the WIN direction and the radial direction of the floppy disk.

However, the side 1 gimbal has a printed circuit board attached to it, and the side l gimbal has an I! Although the center of gravity is supported, there are slight variations in its position, and there are also variations in the accuracy of several gimbals and helad cores, so there is It is difficult in machining to provide uniform elastic force in all radial directions. As a result, the state of contact between the two heads may become unstable, and as a result, the characteristics of both heads may differ, the floppy disk may be damaged, and resonance may occur. Ashi, this countermeasure was desired.

[Purpose of the invention]

The present invention was made based on these circumstances, and
The purpose of this is to eliminate design difficulties, stabilize the contact state between both heads, make the characteristics of both heads uniform, and prevent the occurrence of horizontal opening of the floppy disk, bidisk, and resonance phenomena. Our goal is to provide the following.

[Summary of the invention]

In the double-sided contact type floppy head device of the present invention, the length of the contact surface of the side L head supported by a non-pulse with a small elastic force is equal to the length of the contact surface of the side O head supported by a gimbal with a small elastic force. O [Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

Figure 3 shows a floppy disk 1 and a floppy head device 1.
In the figure, 13 is the side l head, and x4 is the side l gimbal that supports it. Note that the jacket of the floppy disk 11 is omitted in the drawing, and the arrow a indicates the direction of rotation of the floppy disk 11.

4 and 5 show the positional relationship between the side 0 head 13 and the side 0 head 15 located above and below the floppy disk 1, and 16 in the figure shows the side 0 head 1.
It is a side 0 cymbal that supports 5. The side l head 13 has a groove 17 in the tangential direction of the disk 11 on its contact surface with the floppy disk 1 .

Therefore, the relationship between the length of the head core of the side L head 13 (the length in the tangential direction of the floppy disk 11) tal and the length taO of the head core of the side 0 head 15 is as follows.
tal) taOJ. Furthermore, the length of the contact surface of the side 1 head 13 (the length in the tangential direction of the floppy disk 11) is tbl, and the length of the contact surface of the side 0 head 15 is tb.

The relationship between rtbl and tbOJ is rtbl>tbOJ. Furthermore, the length dimension of the head core of both the side L head 13 and the side 0 head 15 is larger than the width dimension (the length in the radial direction of the floppy disk 110), and the length of the contact surface is also larger than the width. .

Also side 1 gimbal 14 and side 0 gimbal 16
Both of these are leaf springs, but the thickness of the side L gimbal 14 is made thinner than that of the side 0 gimbal 16, and the elastic force of the side 1 gimbal 14 is made smaller than the elastic force of the side 0 non-pulse 16. It is small.

By having the above configuration, both heads 13.1
It was confirmed that the state of contact with the floppy disk 11 was stable for both cases. Furthermore, by stabilizing the contact state, the characteristics of both heads became uniform, and it was possible to obtain the effect of preventing the occurrence of out-of-tuning and resonance phenomena in the 70 disk.

〔Effect of the invention〕

As described above, according to the present invention, the length of the contact surface of the side 1 head supported by a gimbal with a small elastic force is the length of the contact surface of the side 0 head supported by a gimbal with a small elastic force. By stabilizing the contact state of both heads with the floppy disk, design difficulties can be eliminated, and the characteristics of both heads are uniform, and floppy disk damage and resonance phenomena can be avoided. It can produce excellent effects such as preventing the occurrence of.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the relationship between the side 1 head and the side 0 head in the conventional example, Fig. 2 is a side view of Fig. 1 viewed from the direction of the arrow ■), and Figs. 3 to 5
The figure shows one embodiment of the present invention, and FIG. 3 shows 70. FIG. 4 is a plan view showing the positional relationship between the floppy disk and the floppy head device, FIG.
FIG. 3 is a side view of the figure viewed in the direction of arrow X with non-pals added thereto; 12...Double-sided contact type floppy head assembly bL I J.
...Side 1 head, 14...Side L non-pal, 1
5...Side 0 head, 16...Side 0 non-pal. Applicant's agent Patent attorney Takehiko Suzue Commissioner of the Patent Office Kazuo Wakasugi 1. Display of the case Japanese Patent Application No. 58-127333 2, Name of the invention Double-sided contact floppy head device 3, Person making the amendment Relationship to the case Patent applicant (35G) Tokyo Electric Co., Ltd. 4, Agent 5, Spontaneous amendment

Claims (2)

[Claims] (1) Side l supported by a gimbal with small elastic force
A double-sided contact type 70 double head device characterized in that the length of the welding surface of the head is greater than the length of any contact surface toward the side O supported by a gimbal with a large elastic force. (2) The double-sided contact type floppy head device according to claim 0, wherein the width of the contact surface of the side 1 head is larger than the width of the contact surface of the side 0 head.