US 5,315,372 A · Non-contact servo track writing apparatus having read/head arm and reference arm

Abstract

A servo track writing apparatus (10, 210) for writing servo tracks (16) on a media disk (14) of a disk drive assembly (12), the servo track writing apparatus (10, 210) having a laser interferometer (30) for positioning a remote servo track positioning arm (48, 248) with a second cube corner retroreflector (46) attached thereto. A relationship determining apparatus (56, 256) determines the physical relationship between the track positioning arm (48, 248) and a head positioning arm (22) or linear head actuator (220) using a light emitting device (58) and a photosensitive diode array (60). A third light beam (62) from the light emitting device (58) is reflected from the head positioning arm (22) or linear head actuator (220) onto the photosensitive diode array (60) and variations in the position of the third light beam (62) on the photosensitive diode array (60) cause a head positioning arm servo motor (68) to move the head positioning arm (22) or linear head actuator (220)head positioning arm (22) or linear head actuator (220) as required.

Claims19

Dependent claims

A servo track writing apparatus for positioning a read/write head and an associated head positioning arm over a media disk, comprising:

a first movable arm;
a laser interferometer for determining the position of said first movable arm;
a head positioning arm affixed to the read/write head for holding and positioning the read/write head;
a relationship determining apparatus for determining a the position of said head positioning arm relative to said first movable arm;
first motive means for moving said first movable arm;
and
second motive means for moving the read/write head to maintain a fixed relationship between the read/write head and said first movable arm.

4 more elements

A servo track writing device for positioning a head positioning arm with a read/write head affixed thereto such that the read/write head can write servo tracks onto a media disk in a disk drive assembly, comprising:

a reference arm which can be positioned relative to the disk drive assembly by a reference arm motive means;
and
a relationship determining means for determining any deviation from a fixed relationship between said reference arm and the head positioning arm such that the head positioning arm may be slaved according to information provided by said relationship determining means to maintain the fixed relationship between said reference arm and the head positioning arm.

Dependencies are inferred from the claim text.

Non-contact servo track writing apparatus having read/head arm and reference arm

Life of this patent

Non-contact servo track writing apparatus having read/head arm and reference arm

Life of this patent

Abstract

Claims19