Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1990-08-09
1993-10-05
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360104, 341 15, G11B 556, G11B 2124, H03M 122
Patent
active
052510875
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a holder for holding a magnetic sensitive element to secure it at a predetermined position. More specifically, the present invention relates to a holder for magnetic sensitive elements which can be applied to a magnetic encoder.
TECHNICAL TERMS
In the specification of the present application, the term "holder" means a part for securing a magnetic sensitive element and includes signal lines for input/output terminals. The term "magnetic sensitive element" is what can be described as a magnetism sensor for detecting magnetic energy, and embraces a magneto-resistance element, a Hall element, a thin-film magnetic head and the like.
BACKGROUND ART
Conventionally, a magnetic sensitive element 4, which is used with a magnetic encoder or the like, is secured to a holder 11 as shown in FIG. 12, and so arranged therein as to opposingly face a magnetic drum with a predetermined gap provided therebetween. As disclosed in, for example, Japanese Utility Model Laid-Open Publication No. Sho. 62-20,313, the holder 11 for such a magnetic sensitive element 4 comprises a positioning pin 11b and an adjustment slot 11a such that a machine screw 10 is inserted through the slot 11a with the pin 11b fitted into a positioning hole formed in a circuit board, thereby securing the holder 11 to the circuit board. The gap between the magnetic drum and the holder 11 can be adjusted by utilizing the slot 11a. Another type of holder is known in which, as shown in FIG. 13, an H-shaped separable holder 13, having the magnetic sensitive element 4 secured thereto, is combined with a fixed holder 12 having a pair of right and left guide walls 12a and a pair of right and left grooves 12b, the H-shaped separable holder 13 being fitted vertically in between the guide walls 12a and the grooves 12b. This holder is also arranged to enable the aforesaid gap to be adjusted by moving the fixed holder 12 per se via right and left slots 12c formed in the fixed holder 12. The holder disclosed in Japanese Patent Laid-Open Publication No. Sho. 61-165,621 is, as shown in FIG. 18, separated into a movable holder 14 in which is secured a magnetic sensitive element and a fixed holder 15 for holding the movable holder 14. The movable holder 14 is movably accommodated in the fixed holder 15, and to move the movable holder 14 forwardly and backwardly via a gap adjustment screw 16 and spring 17 will effect a positional adjustment of the movable holder 14 relative to the fixed one 15.
However, if the slot 11a or 12c is to be formed which allows the holder 11 or 12 to be secured to the circuit board or the like so that the holder 11 or 12 can be moved for fine adjustment, it is necessary to form the holder into a shape projecting in the rightward and leftward directions. This results in disadvantage that it is impossible to miniaturize the holder because of the increased holder size. The holder shown in FIG. 18 also has the problem that the holder size increases since screw-mounting holes 18 for securing the fixed holder 15 to the board need to be formed on right and left sides. As a result, such a holder occupies a wide area on the board. Another problem is that costs increase since the machine screw 10 is used for securing the holder to the board and thus such working step as a tapping is needed. The arrangement in which the movable holder 14 is moved for adjustment by means of the gap adjustment screw 16 has the disadvantage that an extremely complicated and large structure is needed for accommodating the adjustment screw 16 and the spring 17.
As shown in FIG. 14, the magneto-resistive element 4 has a resistance pattern which is generally formed by a plurality of resistors R.sub.1, R.sub.2, R.sub.3 and R.sub.4. It is desirable that this resistance pattern, which faces towards a magnetic drum 8, should be disposed parallel to a tangent T extending to touch one point closest to the center of the magnetic sensitive surface 4a of a magnetic recording medium 9 secured to the magnetic drum 8. With the magnetic sensi
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Sakashita Hiroshi
Yoneda Tatemi
Yoshida Norihide
Evans Jefferson
Levy Stuart S.
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