JPH0543371U - Tape cartridge - Google Patents

Abstract

(57) [Abstract] [Purpose] In order to reduce the amount of felt used, in the head pad 6 in which the mounting portion 9 is projectingly provided on the pad holder 7 and the thin pad chip 10 is adhered thereto, the adhesive softens. Even under the condition, the pad chip 10 is prevented from being displaced in the tape running direction. [Structure] The left and right leg walls 13 of the mounting portion 9 are covered with a sheet-shaped pad chip 10, and the pad chip 10 is bonded to the mounting portion 9 in a state of being bent in a V shape. This causes most of the adhesive surface to intersect the tape running direction at a large angle. That is, the lateral displacement force acting on the pad chip 10 is received by the leg walls 13 and 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tape cartridge provided with a head pad for bringing a tape into close contact with a magnetic head.

[0002]

[Prior Art]

 Most of the pad chips that make up the head pad are made of block-shaped felt made of rabbit or sheep wool, and the front and rear thicknesses of the pad tip are made large enough to allow the main body case, tape guide, etc. Even if the dimensions vary, the tape can be reliably attached to the magnetic head. In this type of head pad, it is known in Japanese Utility Model Publication No. 58-43109 to reduce the amount of felt used by using a thin pad tip. There, a U-shaped attachment part is bent and formed so as to project toward the tape running surface at the center of the plate surface of a plate pad holder, and a sheet-shaped pad chip is bonded to this attachment part. .

[0003]

[Problems to be solved by the device]

 According to the head pad described above, the amount of felt used can be reduced by the protrusion size of the mounting portion, so that the material cost is reduced. However, if the thickness of the pad chip is reduced, the amount of compressive deformation of the entire pad chip when a constant external force is applied is reduced, the contact area with the magnetic head remains the same, and the buffering action against the external force is reduced. Therefore, when the tape starts to run suddenly, for example, when the pause state is released in the recording or playback mode, the pad chip is dragged and a large lateral displacement force acts on the adhesive surface and the mounting position shifts. Sometimes. Especially, in a high temperature environment, such as the passenger compartment of an automobile left in the hot sun, the adhesive softens, and the pad chip is likely to be displaced. The misalignment is not limited to the tape running direction, but may occur in the direction intersecting the tape running.

When the mounting position of the pad chip shifts in this way, the pad pressure applied from the head pad side changes, which adversely affects the running characteristics of the tape and the recording and reproducing characteristics of the tape deck. In particular, when the positional deviation intersects the tape running direction, a characteristic change may occur for each track. The purpose of this invention is to obtain a low-cost head pad by using a thin sheet-shaped pad chip, eliminating the pad chip from shifting along the bonding surface, and using it under bad conditions. Even in the case, it is to obtain a tape cartridge that can hold the tape stably.

[0005]

[Means for Solving the Problems]

 The tape cartridge of the present invention comprises a head pad 6 for bringing the tape 2 into close contact with the magnetic head 17. The head pad 6 is a pad holder 7 made of a leaf spring and the tape from the plate surface of the pad holder 7. It is composed of a mounting portion 9 protruding toward the running surface and a sheet-shaped pad chip 10 adhered and fixed to this mounting portion 9, and the pad chip 10 forms the mounting portion 9 on one side leg wall 13 From the other side to the leg wall 13 on the other side.

The mounting portion 9 can be formed by a plurality of protrusions 9 a. In this case, the head chip is covered by padding the pad chips 10 from one side to the other side of the leg walls 13 on both side ends and adhering and fixing them. Make up 6.

[0007]

[Action]

 The sheet-shaped pad chip 10 is adhesively fixed to the pad holder 7 on the leg walls 13 protruding from the plate surface thereof. As described above, when the tape running direction and the bonding surface of the pad chip 10 are largely intersected with each other, the lateral force acting on the pad chip 10 can be received by the leg walls 13, 13.

[0008]

[Effect of the device]

 In the present invention, the sheet-shaped pad chip 10 is bent and fixed along the left and right leg walls 13 of the mounting portion 9 so that most of the bonding surface of the mounting portion 9 intersects with the tape running, and the tape 2 The external force applied to the pad chip 10 via the leg walls 13 and 13 is received. As a result, even when the tape cartridge is used under adverse conditions such as a high temperature environment or an environment containing an organic solvent, the pad chip 10 can be prevented from shifting in the tape running direction and the tape can be held stably. Thus, it is possible to obtain a tape cartridge that uses a low-cost head pad and has excellent reliability without deterioration of tape running characteristics and recording / playback characteristics even under adverse conditions.

[0009]

【Example】

 (First Embodiment) FIGS. 1 to 3 show an embodiment in which the present invention is applied to a Philips type tape cartridge. The basic structure of the tape cartridge is not different from the conventional example. As shown in FIG. 2, the main case 1 is constructed by connecting the upper and lower cases in a lid-matching manner, and the hub 3 around which the tape 2 is wound. 3 is rotatably arranged, a head insertion window 4 is provided in the center of the front surface of the main body case 1, and a magnetic shield 5 and a head pad 6 are arranged inside the head insertion window 4.

In FIG. 1, a head pad 6 is a pad holder 7 made of a press-formed product of a thin spring plate material, a mounting portion 9 protruding from the plate surface of the pad holder 7 toward the tape running surface side, and this mounting. The pad chip 10 or the like is fixed to the portion 9 by adhesion. The pad holder 7 is provided with a mounting portion 9 in the left and right center thereof, and a spring arm 11 having a narrower vertical width than the upper and lower central portion of the mounting portion 9 is juxtaposed to the left and right, and the protrusion of the spring arm 11 is directed backward in the case. A hooking piece 12 that bends is formed. The mounting portion 9 is composed of a single protrusion 9a having a V-shaped cross section, and has left and right leg walls 13 and 13 protruding from the plate surface of the pad holder 7, and a bent wall 14 at the tip connecting these leg walls 13 and 13. .

The pad chip 10 is made of sheet-like felt made of animal hair such as rabbit or sheep, and is formed by cutting the felt into a strip shape slightly wider than the tape 2. In this embodiment, the thickness of the pad chip 10 in the free state is 0.8 mm when the protrusion of the mounting portion 9 is 1.0 mm. The pad chip 10 is covered along the outer surface of the mounting portion 9 and is fixed in a bent shape by an adhesive applied to either one of the both parts 9 and 10 to be integrated with the leg wall 13 and the bending wall 14.

In the head pad 6 configured as described above, the spring arm 11 of the pad holder 7 is dropped between the magnetic shield plate 5 and the guide pin 15 shown in FIG. The ribs 16 projecting on the inner surface receive the ribs 16 so that the ribs 16 are positioned with a slight amount of looseness. Reference numeral 17 is a magnetic head.

In use, the magnetic head 17 enters the head insertion window 4 and comes into contact with the tape 2. On the other hand, in the head pad 6, the entire pad holder 7 is flexed and deformed inwardly of the case, and the tape 2 is pressed against the magnetic head 17 via the pad chip 10. When the tape running is started in this state, a lateral displacement force in the tape running direction acts on the pad chip 10 due to friction with the tape 2. However, since the pad chip 10 is adhered in a state of being bent in a V shape along the left and right leg walls 13 and the bending wall 14 intersecting the tape traveling direction, most of the lateral displacement force is applied to the left and right leg walls. Accepted at 13. Therefore, the pad chip 10 will not be displaced along the bonding surface.

Since the pad chip 10 contacts the tape 2 only on the outer surface of the bending wall 14, the contact area with the tape 2 can be reduced to a fraction of that of the conventional head pad. Therefore, when a prescribed pressing force is exerted on the contact surface of the pad chip 10, the frictional resistance acting on the tape 2 can be reduced by the decrease in the contact area, and the adhesion of the tape 2 to the magnetic head 17 can be reduced. The tape running characteristics can be improved while maintaining the same level as before. Since the pad chip 10 is formed of a sheet-like thin felt, not only the production cost of the head pad 6 can be reduced, but also the degree of appearance of chips when the hardened single hair is released or cut is reduced.

Second Embodiment FIG. 4 shows a second embodiment of the head pad 6 in which the mounting portion 9 is changed. In this, the mounting portion 9 is formed by two V-shaped projections 9a, and the pad chips 10 are covered from one side to the other of the leg walls 13 at the left and right ends of the mounting portion 9 and are bent into a U-shape. In this state, it is fixed to both leg walls 13 by adhesion. In this case, the amount of felt used is slightly increased as compared with the pad chip 10 of the first embodiment, but since the void 19 is formed behind the contact portion of the pad chip 10 facing the head gap of the magnetic head 17. The pad chip 10 can be flexibly deformed according to the shape of the contact surface of the magnetic head 17, and the pad chip 10 can be made to fit in the magnetic head well regardless of the difference in the shape of the contact surface. There may be two or more protrusions 9a.

Third Embodiment FIG. 5 shows a third embodiment of the head pad 6 in which the pad holder 7 is changed. This makes the vertical width of the pad holder 7 the same over the entire length in the left-right direction, forms the same mounting portion 9 as in the first embodiment at the center thereof, and bonds the pad chip 10 thereto. Further, tape guides 20 are provided at two places on the left and right with the mounting portion 9 sandwiched therebetween, and the tape guide 20 regulates the vertical movement of the tape 2, thereby improving tape running performance during recording / playback. Is. The tape guide 20 forms a U-shaped guide protrusion 21 on the plate surface of the pad holder 7, and bends the bent wall at the protruding end inward of the guide protrusion 21 to form a guide opening 22. Guide surfaces 23 for restricting the vertical movement of the tape 2 are provided above and below the tape 22.

In addition to the above, the cross-sectional shape of the protrusion 9a forming the mounting portion 9 can be changed to a U shape, a semicircular shape, a U shape, or the like. In such a case, the pad chip 10 is adhesively fixed to the entire outer surface of the protrusion 9a. The pad tip 10 may be formed of woven cloth, non-woven cloth, rubber, foamed elastic body, natural or artificial leather, etc., and need not be a felt made of animal hair. The support form of the pad holder 7 in the main body case may take a form other than the embodiment. For example, the both ends of the spring arm 11 may be wound around a pin erected on the inner surface of the case, or the spring arm 11 may be dropped and mounted between a pair of front and rear projections provided in the case.

[Brief description of drawings]

FIG. 1 is a perspective view of a head pad.

FIG. 2 is an internal plan view of the tape cartridge.

FIG. 3 is a plan view showing a state of a head pad during recording / playback.

FIG. 4 is a plan view of a head pad according to a second embodiment.

FIG. 5 is a perspective view of a head pad according to a third embodiment.

[Explanation of symbols]

 2 tape 6 head pad 7 pad holder 9 mounting portion 9a protrusion 10 pad chip 13 leg wall 17 magnetic head

Claims (2)

[Scope of utility model registration request] 1. A head pad 6 for bringing the tape 2 into close contact with a magnetic head 17 is provided. The head pad 6 is a pad holder 7 made of a leaf spring and extends from the plate surface of the pad holder 7 to the tape running surface. A tape cartridge comprising a mounting portion 9 projecting from the mounting portion 9 and a sheet-shaped pad chip 10 adhered and fixed to the mounting portion 9, wherein the leg wall 13 on one side forming the mounting portion 9 A tape cartridge in which the pad chip 10 is bonded in a bent shape over the leg wall 13 on one side. 2. The tape cartridge according to claim 1, wherein the mounting portion 9 is formed by a plurality of protrusions 9a, and the pad chip 10 is covered and adhesively fixed from one side to the other side of the leg walls 13, 13. ..