JP2535429B2 - Laser mirror reflection mirror attachment mechanism - Google Patents

Description

[Detailed Description of the Invention] Contents Outline Industrial field of application Conventional technology Problems to be solved by the invention Means for solving the problem Action Example of effect of the invention Outline Outline of a reflection mirror mounting mechanism for laser length measurement, reflection The mirror can be easily attached to the carriage to improve the working efficiency, and the mounting can be adapted to mass production to improve the overall manufacturing efficiency. Servo track information is provided for the purpose of providing a reflection mirror mounting mechanism for laser length measurement that can prevent occurrence of head loss and prevent proper recording / playback. In the mechanism for attaching the reflection mirror for laser length measurement to the magnetic head positioning movable part of the carriage during writing work, A plurality of slits are formed in the longitudinal direction of the lower end of the cylindrical member having a super-shaped inner peripheral surface portion, a screw part is formed on the inner periphery of the upper end, and a screw rod having a tapered disk fixed at the tip, The cylindrical member such that one end of the screw rod projects from an upper portion of the cylindrical member and a tapered disc fixed to the screw rod is fitted to a tapered peripheral surface portion of the cylindrical member. A collet chuck member that is screwed into the fixing member, and a fixing member that fixes the reflection mirror for laser length measurement and that has a through hole formed at a desired position. The through hole of the fixing member has an upper end portion of the cylindrical member. A reflection mirror assembly is formed by fitting and fixing, and a lower end of a cylindrical member of the reflection mirror assembly is expanded and fixed in a circular recess formed around the rotation axis of the magnetic head positioning movable portion. To do.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection mirror mounting mechanism for laser length measurement.

As the demand for computers has increased in recent years,
A wide variety of computers are on the market, and there is no lack of effort in their development. And when developing a computer,
While it is demanded that the processing speed be increased exponentially, the accuracy at the time of processing occupies an important weight, so that the accuracy at the time of recording / reproducing of the magnetic recording apparatus for a computer is also an important factor.

A typical example of a magnetic recording device for a computer is a hard disk, and one of the important factors controlling the accuracy of recording / reproducing of this hard disk is a servo disk incorporated with a plurality of magnetic disks. To be Servo track information necessary for controlling the head positioner at the time of recording / reproducing on another magnetic disk is recorded on this servo disk.
When writing this servo track information on the servo disk, it is necessary to write it as accurately as possible for the reasons described above. Therefore, in the servo track information writing process in the hard disk manufacturing process, the reflection mirror for laser length measurement is mounted on the carriage of the head positioner. The position of the carriage must be controlled while irradiating the reflection mirror with a laser beam. However, it is not easy to attach the laser length-measuring reflection mirror because the operator must manually align and attach it to a predetermined position of the carriage and must be attached to each hard disk every time. Therefore, there is a demand for facilitating attachment of the laser length measurement reflection mirror.

2. Description of the Related Art A conventional reflecting mirror mounting mechanism for laser length measurement will be described with reference to FIG.

In this figure, 1 is a carriage. The carriage 1 is composed of a head arm movable part 2 that rotates in a left-right direction around a rotation shaft 2a, and a plurality of gimbal assemblies 3 fixed to the tips of a plurality of arm fixing parts 2b of the head arm movable part 2. It is configured.

A circular concave portion 2c is formed on the upper surface of the head arm movable portion 2 with the rotary shaft 2a as the center, and screw holes 2d are formed on both sides of the concave portion 2c.

The gimbal assembly 3 includes a plate-shaped head arm 3a whose width is gradually narrowed from the base fixed to the arm fixing portion 2b toward the tip, and a magnetic recording / reproducing fixed to the tip of the head arm 3a. It is composed of a head 3b.

The carriage 1 including the cymbal assembly 3 and the head arm movable portion 2 has a plurality of magnetic disks including a servo disk (not shown) fixed and arranged at right angles to the rotation axis and at equal intervals. A magnetic head 3b, which is combined with a disk and fixed to the carriage 1, records information on the magnetic disk and reproduces the recorded information, and further writes servo track information on the servo disk. It is like this.

Reference numeral 4 denotes a reflection mirror assembly. In this reflection mirror assembly 4, reflection mirrors 4b and 4b configured by combining three mirrors are embedded in holes provided at both ends of one side surface of a rectangular parallelepiped fixing member 4a. In addition, in each of the through holes on both sides that penetrate from the top surface to the bottom surface,
b and 4b are inserted.

The reflection mirror assembly 4 is used to detect and control the position of the carriage 1 that writes servo track information on the servo disk in the servo track information writing process in the hard disk manufacturing process. The detection method is the sixth
The principle of the Michelson interferometer shown in the figure is applied.
This Michelson interferometer is used to accurately measure the optical path difference between the illustrated optical path 10 and the optical path 11, and is emitted from the semiconductor laser 12, reflected by the half mirror 13, and reflected by the mirror 14. Further, the light 16 transmitted through the half mirror 13 and the light 18 transmitted through the half mirror 13 and then reflected by the mirror 17 and reflected by the half mirror 13 simultaneously enter the photodetector 15, and the photodetector 15 The light 16 and the light 18 generate a signal proportional to the combined light intensity. Then, the generated signal is output terminal 19
The optical path difference between the optical path 10 and the optical path 11 is measured by inputting it to a measuring device (not shown) via.

That is, according to this principle, a laser beam is emitted from the optical device (not shown) to each of the reflection mirrors 4b, 4b, and the rotation angle of the carriage 1 is detected by the light reflected and returned, and the carriage 1 is moved to the servo track. It can be held at the optimum location for writing information.

Such a reflection mirror assembly 4 is mounted on the carriage 1
When mounting the carriage on the carriage 1, the reflection mirror assembly 4 is placed at a predetermined position on the upper surface of the carriage 1, and the screw holes 2d, 2d of the carriage 1 and the adjusting screws 4c, 4c of the reflection mirror assembly 4 are screwed together and fixed. Good.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, in fixing the reflection mirror assembly 4 to the carriage 1 in the above-described laser length measurement reflection mirror mounting mechanism, it is necessary for an operator to perform a servo track information writing process in a hard disk manufacturing process. This has to be done by hand, and moreover, it has to be attached / removed every time the hard disks are sent in sequence, so there is a problem of poor work efficiency.

Further, in consideration of mass production of hard disks, there is a problem that the mass production cannot be dealt with by a worker manually performing the work.

Furthermore, in the above-mentioned mounting mechanism, dust is generated from the screw holes 2d, 2d of the carriage 1, and the dust enters between the magnetic head 3b and the magnetic disk, and proper recording / reproducing cannot be performed. In the worst case, there is a problem of causing a head crash that damages the magnetic head 3b or the magnetic disk.

The present invention has been made in view of the above circumstances, and it is possible to easily attach the reflection mirror to the carriage to improve work efficiency, and the attachment thereof can be adapted to mass production. A laser that can improve overall structural efficiency, prevent dust from being generated, and perform proper recording / reproducing, and prevent head crush. An object is to provide a reflection mirror attachment mechanism for length measurement.

Means for Solving the Problems In a mechanism for mounting a reflection mirror for laser length measurement on a magnetic head positioning movable portion in a servo track information writing operation, first, a plurality of vertically arranged lower end portions of a cylindrical member having a tapered inner peripheral surface portion are provided. And the screw part is formed on the inner circumference of the upper end.

And, a screw rod with a tapered disk fixed at the tip,
The cylinder is formed so that one end of the screw rod projects from the upper portion of the cylindrical member, and the tapered disc fixed to the screw rod is fitted to the tapered inner peripheral surface portion of the cylindrical member. Form a collet chuck member that is screwed onto the member.

Further, a fixing member to which the reflection mirror for laser length measurement is fixed and a through hole is formed at a desired position is provided.

Then, a reflection mirror assembly is formed by fitting and fixing the upper end portion of the cylindrical member into the through hole of the fixing member, and in a circular concave portion formed around the rotation axis of the magnetic head positioning movable portion, The lower end of the cylindrical member of the reflection mirror assembly is expanded and fixed.

Further, as another configuration, first, a plurality of slits are formed in the longitudinal direction of the lower end portion of the cylindrical member having the tapered inner peripheral surface portion, and a rod having a tapered disc fixed to one end is formed.
Through a coil spring, so that a part of the rod projects from the upper part of the cylindrical member, and a tapered disk fixed to the rod is fitted to a tapered inner peripheral surface portion of the cylindrical member,
A collet chuck member is formed in which the rod is housed in the cylindrical member together with the coil spring.

Then, the reflection mirror for laser length measurement is fixed, and a fixing member having a through hole formed at a desired position is provided, and the upper end of the cylindrical member is fitted and fixed in the through hole of the fixing member. Reflective mirror assembly set means for releasably engaging the reflective mirror assembly forming the assembly and moving the reflective mirror assembly up and down.

Further, the reflecting mirror assembly setting means is moved downward to insert the lower end portion of the cylindrical member of the reflecting mirror assembly into a circular concave portion formed around the rotation axis of the magnetic head positioning movable portion, and the coil spring It is configured by expanding and fixing by spring pressure.

Operation According to the present invention, the lower end of the cylindrical member of the reflection mirror assembly is inserted into the circular recess formed around the rotation axis of the magnetic head positioning movable portion, and the screw rod of the collet chuck member of the reflection mirror assembly is inserted. When is turned to one side, the taper disk of the screw rod pushes the lower end of the cylindrical member where the slit is formed from the inside, and the pushed portion is pressed against the inner wall of the concave portion of the magnetic head positioning movable portion. . Thereby, the reflection mirror assembly can be easily fixed to the magnetic head positioning movable portion.

According to another configuration, the lower end of the cylindrical member of the reflection mirror assembly is inserted into the recess of the magnetic head positioning movable portion by moving the reflection mirror assembly setting means downward. At this time, the engagement between the reflection mirror assembly and the reflection mirror assembly setting means is released, whereby the coil spring that has been compressed by the engagement of the rod of the collet chuck member of the reflection mirror assembly returns to its original state. The tapered disk fixed to the rod is pushed downward by the force of the coil spring returning to the original position, and the lower end of the cylindrical member where the slit is formed is expanded from the inside. It is pressed against the inner wall of the recess of the movable part.

EXAMPLES Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing a reflecting mirror mounting mechanism for laser length measurement according to a first embodiment of the present invention, and FIG. 2 is a schematic perspective view of the reflecting mirror assembly shown in FIG. In these figures, parts corresponding to those of the conventional example shown in FIG. 5 are designated by the same reference numerals.

In these figures, 1 is a carriage and 20 is a reflection mirror assembly.

The reflection mirror assembly 20 includes reflection mirrors 4b and 4 in holes formed at both ends of one side surface of a rectangular parallelepiped fixing member 21.
b is embedded, and further, a through hole 21a penetrating from the upper surface to the lower surface is formed at the center position of the upper and lower surfaces of the fixing member 21,
A collet chuck member 22 is fitted in the through hole 21a.

The collet chuck member 22 has two large and small cylindrical portions 23a, 23.
A cylindrical disk 24 having a shape obtained by combining b is fixed to a lower end of a tapered disc 24, and an upper end of which is screwed with a screw rod 26 having a horizontal rod 25 attached thereto. Further, the cylindrical portion 23a of the cylindrical member 23 has a plurality of slits 23a ₁
(See FIG. 2) is formed, and the upper portion of the inner peripheral surface thereof is tapered. Further, the cylindrical portion of the cylindrical member 23
A screw portion for screwing the screw rod 26 is formed on the inner periphery of 23b. Then, by rotating the screw rod 26 of the collet chuck member 22 in a predetermined direction by the horizontal rod 25, the disc 24 fixed to the end portion of the screw rod 26 is pulled upward, and the cylindrical portion 23a of the cylindrical member 23 is tapered. The circular plate 24, which is pressed against the circumferential surface portion, presses the portion of the cylindrical portion 23a where the slit 23a ₁ is formed from the inside.

When the reflection mirror assembly 20 having such a structure is fixed to the carriage 1, the cylindrical portion 23a of the cylindrical member 23 of the reflection mirror assembly 20 is connected to the head arm movable portion 2 of the carriage 1 as shown in FIG. Insert into hole 2c, screw rod
26 may be rotated in a predetermined direction to widen the portion of the cylindrical portion 23a in which the slit 23a ₁ is formed, and may be pressed against and fixed to the inner wall of the hole 2a.

That is, according to such a laser length measurement reflection mirror mounting mechanism, it is sufficient to insert the cylindrical portion 23a of the reflection mirror assembly 20 into the hole 2a of the carriage 1 and rotate the screw rod 26 in a predetermined direction. It will be easier. Further, unlike the conventional example, since a small screw hole where dust is easily accumulated is not formed, dust is not generated in the hard disk.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a schematic cross-sectional view showing a reflecting mirror mounting mechanism for laser length measurement according to a second embodiment of the present invention, and FIG. 4 is for explaining the operation of the reflecting mirror mounting mechanism for laser length measurement shown in FIG. FIG. In these figures, parts corresponding to the respective parts in FIG. 1 are given the same reference numerals.

In FIG. 3, 1 is a carriage and 20A is a reflection mirror assembly.

In this reflection mirror assembly 20A, 31 is a rectangular parallelepiped-shaped fixing member, and the reflection mirrors 4b and 4b are embedded in holes provided at both ends of one side surface of the fixing member 31. A through hole 31a penetrating from the upper surface to the lower surface is formed at the center position of the upper and lower surfaces. A collet chuck member 32 is fitted in the through hole 31a.

The collet chuck member 32 includes a cylindrical member 33, a rod 35 having an inverted taper-shaped disc 34 fixed to the lower end thereof, and a coil spring.
It is configured to be inserted through 36. Also, a cylindrical member
The lower end portion 33, a plurality of slits in the first embodiment similarly to the vertical direction and (reference numeral 23a ₁ shown in FIG. 2) is formed, on the inner circumferential surface thereof slit, reverse The inner peripheral surface portion is provided in a tapered shape.

In addition, the reflection mirror assembly 20 configured in this way
A is attached to the lower part of the reflecting mirror assembly setting means 30 which moves the reflecting mirror assembly 20A up and down.

As shown in the figure, the reflecting mirror assembly setting means 30 is formed by combining a plate-shaped member and a rod-shaped member in a ladder shape below the air cylinder 37. The air cylinder 37 includes an air cylinder body 37a, a plate-shaped cylinder base 37b fixed to the lower portion of the body 37a, and a cylinder base 3a.
It is composed of a piston rod 37c that freely expands and contracts vertically through a through hole provided in 7b.

Through holes 3 that come out vertically at both ends of the cylinder base 37b.
7b ₁ and 37b ₁ are formed, and rod springs 38 and 38 formed of elastic metal members are inserted and engaged in the through holes 37b ₁ and 37b ₁ , respectively. Circular stoppers 37b ₂ and 37b ₃ are fixed at arbitrary intervals above and below the portion of the rod spring 38 inserted into the through hole 37b _1.
The bar spring 38 can be moved up and down by a length between ₂ and 37b ₃ . A plate-shaped lifting base 39 is fixed to the lower ends of the bar springs 38, 38. Both ends of the elevating base 39 are attached to a moving device (not shown) so that the entire reflecting mirror assembly 20A and the reflecting mirror assembly setting means 30 can be moved up and down. Further, a large through hole is provided at the center of the elevating base 39, and a disc member 40 having a through hole 40a formed at the center thereof is movably fitted in the through hole.

The disc member 40 is connected to the cylinder base 3 via the first vertical bars 41, 41.
7b, and the rod 35 of the collet chuck member 32 penetrates through the through hole 40a of the disc member 40.

The first plate member 42 is engaged with the piston rod 37c of the air cylinder 37 via a through hole formed in the center thereof, and is fixed by a stopper 37c ₁ at the tip of the piston rod 37c. Further, the first plate member 42 has second vertical bars 43, 4
The second plate member 44 is fixed via 3 and the second plate member 4
Convex portions 45, which are short rods, are fixed to both ends of the lower surface of 4. Further, the through hole 44 is formed in the central portion of the second plate member 44.
a is formed, through holes 44b, 44b are formed at both ends, the tip of the rod 35 of the collet chuck member 32 is engaged with the through hole 44a, and the through holes 44b, 44b respectively have the first holes. Vertical bar 4
1,41 has been inserted. That is, the second plate member 44 includes the rod 35 and the first vertical rods 41, 41 engaged with the through holes 44a, 44b, 44b.
You can freely move up and down along the. However,
The range of vertical movement is the stoppers 37b ₂ , 3 at the tip of the rod spring 38.
Only length between 7b ₃ .

Next, a case where the reflection mirror assembly 20A having the above-described configuration is fixed to the carriage 1 will be described.

First, as shown in FIG. 3, the reflection mirror assembly 20
The lower end portion of the cylindrical member 33 of A is aligned with the upper position of the hole 2a of the head arm movable portion 2 of the carriage 1.

Next, as shown in FIG. 4, by lowering the elevating base 39 of the reflecting mirror assembly setting means 30 downward, the reflecting mirror assembly setting means 30 and the entire reflecting mirror assembly 30A are lowered, and the cylindrical member of the reflecting mirror assembly 20A. The 33 part is inserted into the hole 2c of the head arm movable part 2. Then, the piston rod 37c of the air cylinder 37 is extended downward (see arrow Y1). When the piston rod 37c extends a certain length, as shown in the figure, the first plate member 42 engaged with the piston rod 37c moves down together with the piston rod 37c (see arrow Y2), which causes the second plate member 44 to move.
Descends along the first vertical bars 41, 41, and the convex portion 45 fixed to the lower surface of the second plate member 44 contacts the upper surface of the elevating base 39,
Push the lifting base 39 from above (see arrow Y3).

At this time, the force that extends in the arrow Y1 direction acts on the piston rod 37c as described above.
Is the force to push the elevating base 39 downward (see arrow Y3). Therefore, when the force of the piston rod 37c extending further acts, the convex portion 45 moves the elevating base 39 downward (arrow). However, since the lifting base 39 does not go down below this position, the air cylinder 37 main body moves upward (arrow Y).
Refer to). As a result, the cylinder base 37b also rises upward, and the first vertical rods 41, 41 fixed to the cylinder base 37b are also stopped by the stoppers 37b ₂ ,
The length between 37b ₃ rises upwards (see arrow Y5). Then, the disk member 40 fixed to the tips of the first vertical bars 41, 41 is also lifted, and as shown in FIG.
20A is released from the reflection mirror assembly setting means 30.

Further, when the reflection mirror assembly 20A is released in this way, the bar 35 of the collet chuck member 32 is contracted by being engaged with the reflection mirror assembly setting means 30 and being lifted upward. 36 returns to its original state, and the returning force pushes the inversely tapered circular plate 34 downward, so that it is tightly fitted to the inversely tapered inner peripheral surface portion of the cylindrical member 33. As a result, the reverse taper disk 34 widens the portion of the cylindrical member 33 in which the slit is formed, and the cylindrical member 33 press-contacts the inner wall of the hole 2a of the head arm movable portion 2. As a result, the reflection mirror assembly 20A is fixed to the head arm movable portion 2 of the carriage 1.

Therefore, the reflection mirror assembly fixed in this way
Since 20A is in a state of being separated from the reflection mirror assembly setting means 30, the head arm movable section 2 can freely rotate with the rotation of the head arm movable section 2.

That is, according to the reflecting mirror mounting mechanism for laser length measurement of this embodiment, the reflecting mirror assembly 20A is attached to the carriage 1.
Can be easily fixed and can be fixed automatically. Further, dust is not generated as in the first embodiment.

EFFECTS OF THE INVENTION As described above, according to the present invention, the reflection mirror assembly can be easily fixed to the magnetic head positioning movable portion of the carriage, so that the working efficiency can be improved.

Further, since the fixing can be automatically performed, there is an effect that mass production can be coped with and overall manufacturing efficiency can be improved.

Furthermore, since it is possible to prevent dust from being generated, it is possible to perform appropriate recording / reproducing and prevent head crash.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing a reflecting mirror mounting mechanism for laser length measurement according to a first embodiment of the present invention, and FIG. 2 is a schematic perspective view of the reflecting mirror assembly shown in FIG. FIG. 3 is a schematic cross-sectional view showing a laser length measuring reflection mirror mounting mechanism according to a second embodiment of the present invention, and FIG. 4 illustrates the operation of the laser length measuring reflection mirror mounting mechanism shown in FIG. FIG. 5 is a schematic perspective view showing a conventional mounting mechanism for a reflection mirror for laser length measurement, and FIG. 6 is a diagram for explaining the principle of a Michelson interferometer. 2 ... Magnetic head positioning movable part, 2c ... Recessed part of magnetic head positioning movable part, 4b ... Laser length measurement reflection mirror, 20,20A ... Reflection mirror assembly, 21,31 ... Fixed member, 22,32 ...... Collet chuck member, 23,33 …… Cylindrical member, 23a ₁ …… Slit, 24 …… Tapered disc, 26 …… Screw rod, 30 …… Reflecting mirror assembly, 34 …… Inverted taper disc, 35 …… Stick, 36 …… Coil spring.

Claims (2)

(57) [Claims] _1. A cylindrical member (23) in which a slit (23a ₁ ) is formed in the vertical direction at the lower end of a mounting mechanism for a laser reflection mirror on a movable magnetic head positioning part of a carriage in a servo track information writing operation. And a reflection mirror assembly (20) attached to the upper end of the cylindrical member (23) and having a laser length measurement reflection mirror (4b) fixed thereto, the rotation of the magnetic head positioning movable part (2). the axial recess formed circular about the (2c), the lower end portion of the slit of said cylindrical member (23) scaling means for scaling the (23a ₁₎ (26), the slit (23a ₁₎ is condensed In this state, the lower end of the cylindrical member (23) is inserted, and after insertion, the slit (23a ₁ ) is expanded and pressed against the inner wall of the recess (2c) to fix the reflection mirror (4b) for laser measurement. Characterized by Reflective mirror mounting mechanism for laser length measurement. 2. A mechanism for mounting a reflection mirror for laser length measurement on a magnetic head positioning movable portion of a carriage in a servo track information writing operation, wherein a lower end portion of a cylindrical member (33) having a tapered inner peripheral surface portion is provided in a vertical direction. A coil spring (3) is formed on a rod (35) that has a plurality of slits and has a tapered disc (34) fixed at one end.
6) through which a part of the rod (35) protrudes from the upper part of the cylindrical member (33), and the tapered disc (34) fixed to the rod (35) is inserted into the cylindrical member (33). ) A collet chuck member (32) in which the rod (35) is housed in the cylindrical member (33) together with the coil spring (36) so as to be fitted to the tapered inner peripheral surface part of A fixing member (31) for fixing the reflection mirror (4b) and forming a through hole at a desired position, and fitting the upper end of the cylindrical member (33) into the through hole of the fixing member (31). A reflecting mirror assembly setting means (30) for fixedly forming the reflecting mirror assembly (20A) and moving the reflecting mirror assembly (20A) up and down is releasably engaged with the reflecting mirror assembly (20A). , A circle formed around the rotation axis of the magnetic head positioning movable part (2) The reflecting mirror assembly setting means (30) is moved downward into the concave portion (2c) of the cylindrical mirror (33) to insert the lower end of the cylindrical member (33) of the reflecting mirror assembly (20A) and the spring pressure of the coil spring (36). A reflection mirror attachment mechanism for laser length measurement, which is expanded and fixed.