Magnetic recording/reproducing apparatus capable of high-density recording on a magnetic tape guided at high speed

• US 5,307,227 A
• Filed: 03/20/1992
• Issued: 04/26/1994
• Est. Priority Date: 08/06/1991
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Takeuchi, Hiroaki, Okuda, Tohru, Okada, Hideo
• Primary Examiner(s): Wolff, John H.
• Assistant Examiner(s): Davis, David D.
• Application Number:
  US07/855,110
• Time in Patent Office: 767 Days
• Field of Search: 360/122
• US Class Current: 360/122
• CPC Class Codes: G11B 15/62 Maintaining desired spacing between record carrier and head
• CPC Class Codes: G11B 5/4893 relative to moving tape

Abstract

In order to obtain a desired output characteristic in magnetic recording/reproducing apparatus, a proper range of magnetic tape wrap angles on a magnetic head are determined according to the following expressions, taking account of tension:

0.5(β.sub.in -γ) ≦ (β.sub.out -γ) ≦

2(β_in -γ)

and β.sub.in + β.sub.out ≦ 2γ+4.0°

where

γ= -0.2 (deg·mm/gf) × T(gf/mm) + 0.6°,

β_in is a wrap angle of an approaching magnetic tape and

β_out is a wrap angle of a leaving magnetic tape.

Claims

1. Magnetic recording/reproducing apparatus including a magnetic head of a cylindrical shape having a magnetic gap on a magnetic tape slide face the length of which in the chordal direction is at most 150 μ

m and guide means for defining a state in which a magnetic tape is wrapped on said slide face, said magnetic recording/reproducing apparatus being so structured that the following relationship is satisfied;

β

_in and β

_out are angles in degrees between a direction of a chord joining both ends of said slide face and movement directions of the magnetic tape coming in and out of contact with said slide face, T(gf/mm) is tension per unit width of said magnetic tape, and θ

is an angle which is set according to a distance between said guide means, and ##EQU8## where γ

= -0.2 (deg·

mm/gf) ×

T(gf/mm) + 0.6°

.

3. The magnetic recording/reproducing apparatus according to claim 1 or 2, wherein the angle θ

is set to 0°

if the distance between the guide means is at most 1mm.

4. The magnetic recording/reproducing apparatus according to claim 1 or 2, wherein the angle θ

is set to 0.6°

if the distance between the guide means is at least 10 mm.

5. The magnetic recording/reproducing apparatus according to claim 1 or 2, wherein said slide face of said magnetic head is divided into a plurality of head portions by a plurality of slots spaced from each other, and

the head portions formed on both sides of a head portion having the magnetic gap serve as said guide means.

6. The magnetic recording/reproducing apparatus according to claim 1 or 2, including a plurality of said magnetic heads provided adjacent to each other.

7. The magnetic recording/reproducing apparatus according to claim 5, including a plurality of said magnetic heads provided adjacent to each other.

2. Magnetic recording/reproducing apparatus including a magnetic head of a cylindrical shape having a magnetic gap on a magnetic tape slide face the length of which in the chordal direction is at most 150 μ

m and guide means for defining a state in which a magnetic tape is wrapped on said slide face, said magnetic recording/reproducing apparatus being so structured that the following relationship is satisfied;

β

_in and β

_out are angles in degrees between a direction of a chord joining both ends of said slide face and movement directions of the magnetic tape coming in and out of contact with said slide face, T(gf/mm) is tension per unit width of the magnetic tape, and θ

is an angle which is set according to a distance between the guide means, and ##EQU9## where γ

₁ = -0.2 (deg·

mm/gf) ×

T(gf/mm) + 0.25°

.