JP2001110046A - Magnetic tape machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape machining device which can highly efficiently produce a magnetic tape that has excellent characteristic to cause no slippage despite of a high tape feeding speed and also to reduce a cupping. SOLUTION: This magnetic tape machining device is provided with an optical system which emits one or more laser beams on a prescribed machining position to machine the back layer of a magnetic tape, a feeding means which holds the magnetic tape at the machining position and feeds the tape in its lengthwise direction with the tape back layer turned to the incident side of the laser beam and a cleaning means which is placed on the upstream side from the machining position set in the tape feeding direction and cleans the back layer of the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of magnetic tapes used for recording / reproducing information, and more specifically, does not cause slip even when a magnetic tape is conveyed at a high speed in a magnetic tape manufacturing process or the like. The present invention relates to a magnetic tape processing apparatus for producing a magnetic tape with small cupping.

[0002]

2. Description of the Related Art A magnetic tape used for recording and reproducing information basically includes a base layer which is a film such as PET (polyethylene terephthalate) and a magnetic layer formed on one surface of the base layer. For the purpose of improving transport stability and strength, the magnetic recording medium has a back layer formed on the opposite surface of the magnetic layer of the base layer.

In the process of manufacturing such a magnetic tape, the magnetic tape (hereinafter referred to as a tape) is subjected to various processes such as cutting by a slitter and cleaning of a surface by a blade while being transported in a longitudinal direction. And then rolled up in a hub or the like to make pancakes or cassettes and sent to the next process or delivery destination. In recent years, in order to improve productivity, various processes (such as manufacturing equipment such as blade machines and winder machines) ) Tends to increase the tape transport speed.

[0004] In general, the tape is conveyed by winding the tape around a capstan roller and rotating the capstan roller. However, when the transport speed of the tape is increased, in a manufacturing apparatus such as a blade machine, the tape entrains air, and the tape floats on a capstan roller or the like, thereby causing the tape to slip, thereby preventing normal transport. There are cases.

As a result, the tape becomes a capstan roller,
The tape is damaged or improperly collides with the guide roller, blade blade, etc., and the tape or tape edge is broken, or the tape is damaged such as abrasion or peeling of the magnetic material layer. Will be. Further, the tape manufacturing apparatus is provided with a roller (measurement roller) for measuring the length of the tape as necessary. However, if the tape slips, an error occurs in the measurement of the tape length, and the production control is performed. Also cannot be performed properly. for that reason,
It has been difficult to increase the tape transport speed in tape manufacturing so as to properly meet the required production efficiency.

[0006] Another problem of the tape is as follows.
Curling (curving) in the width direction of the tape, so-called cupping, is known. Cupping is mainly caused by the difference in the shrinkage of the binder used between the magnetic layer and the back layer. When cupping occurs, the appearance of the magnetic tape as a product deteriorates; And the like, which may cause a recording error or a reading error; damage to the edge of the magnetic tape is likely to occur;

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. In a magnetic tape manufacturing apparatus such as a blade machine and a winder machine, the tape transport speed is increased. Another object of the present invention is to provide a magnetic tape processing apparatus capable of producing a magnetic tape having excellent characteristics without causing a slip of the tape in a capstan roller or the like, and having a small cupping with good production efficiency.

[0008]

In order to achieve the above object, the present invention provides an optical system for projecting at least one laser beam for processing a back layer of a magnetic tape into a predetermined processing position;
A transport device that transports the magnetic tape in the longitudinal direction with the back layer being the laser beam incident side while holding the magnetic tape at the processing position, and a magnetic tape back disposed at a processing position upstream in the magnetic tape transport direction by the transport device. A magnetic tape processing apparatus, comprising: means for cleaning a layer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic tape processing apparatus according to the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

The magnetic tape processed by the magnetic tape processing device of the present invention (hereinafter referred to as a processing device) is made of PET.
Layer (base film) made of amide or aramid resin
Layer structure having a magnetic layer on one side and a back layer (back coat layer) on the other side of the base layer, or further having an overcoat layer (protective layer) and an undercoat layer And processed by the processing apparatus of the present invention to form a recess (preferably a groove) in the back layer.

FIG. 1 conceptually shows an example of a back layer of a magnetic tape (hereinafter, referred to as a tape) having a concave portion in the back layer processed by the processing apparatus of the present invention. FIG.
The example shown in (A) is an example in which a plurality of grooves (processing lines a) extending in the longitudinal direction of the tape are formed in the back layer of the tape. Further, the example shown in FIG.
In the example shown in (A), the processing of the back layer is intermittent (or patterned), and the processing line is divided into lines (processing line segment b).

Incidentally, the shape (cross-sectional shape) of such a concave portion
Is not particularly limited, and examples thereof include a rectangle, a triangle, and a semicircle (bow). Such a shape may be adjusted by the beam spot intensity distribution of the laser beam for processing the back layer. The depth of the recess is not particularly limited, and may be appropriately determined according to the strength of the tape or the like. However, in order to obtain a good effect, the depth of the recess is preferably 0.1 μm or more. In particular, the thickness is preferably 0.2 μm or more. Further, the size (line width) and the formation density of the concave portion are not particularly limited, and may be appropriately determined according to the strength and width (size) of the tape. For example, as shown in FIG. 1, when forming a processing line segment a in a dotted line extending in the longitudinal direction on a tape having a width of 0.5 inch, the width is 3 μm to 10 μm.
It is preferable to form several to about 100 processing lines in the width direction.

The tape having such a concave portion in the back layer has a small amount of air entrainment by the tape even when the tape is conveyed (running) at a high speed, and even when air is entrained, the tape can be suitably removed from the concave portion. Therefore, even when the tape is conveyed at high speed by a tape manufacturing apparatus such as a blade machine, the tape does not rise and slip due to the capstan roller or the like, and there is no damage or error in the conveyance length caused by the tape. Therefore, by using the tape T, it is possible to perform high-speed and accurate tape conveyance, and to manufacture a magnetic tape of appropriate quality stably and efficiently under appropriate production management. Also, since the air between the tapes is preferably released during winding, the winding appearance when wound into a cartridge or pancake is also beautiful.

Further, this tape having a concave portion in the back layer has less cupping than the conventional tape, and has a lower appearance, worsening per head, and damage to the tape edge due to the cupping than the conventional tape. And greatly reduced. The reason why cupping can be reduced by forming a concave portion in the back layer is not clear,
Since the stress generated in the width direction of the tape due to the above-described difference in the shrinkage ratio of the binder is cut at the concave portion, the force generated in the width direction of the tape is reduced as a whole, and as a result, it is considered that cupping can be prevented. .

FIG. 2 shows such a concave portion (magnetic).
1 shows a conceptual diagram of an example of a processing apparatus of the present invention for producing a tape. In FIG. 2, (A) is a view of the processing apparatus viewed from the width direction of the tape, (B) is a view of the processing apparatus viewed from the longitudinal direction (transport direction) of the tape, and (C). )
1 is a schematic sectional view of a processing drum 16 of the processing apparatus.

The illustrated processing apparatus 10 basically includes a light source 12 and a sheet-like laser forming device 14 (both are shown in FIG.
(Omitted in (A)), a processing drum 16, a tape transport device 18, and a cleaning device 20.

The light source 12 emits a laser beam serving as a laser beam for processing the back layer of the tape T.
The light source 12 is not particularly limited, and various laser beam light sources (laser oscillators) can be used as long as they can emit a laser beam having an output capable of processing the back layer. Preferably, one that emits at least one of an ultraviolet laser beam and a visible laser beam is used. In terms of workability, a laser beam having a short wavelength is more preferable, and a laser beam in the ultraviolet region is most preferable, whereas a laser beam in the visible region is preferable in terms of cost, safety, workability, and the like. Specifically, 488 nm
And a light source that emits a 532 nm laser beam obtained by converting the wavelength of a 515 nm argon (ion) laser, a YAG laser with an SHG (Second Harmonic Generation second harmonic generation) element, or the like.

The laser beam emitted from the light source 12 is
It is incident on a sheet-like laser molding device 14 (hereinafter, molding device 14). The shaper 14 expands (diffuses) the laser beam in only one direction, and then shapes the laser beam into parallel light.
It is a flat laser beam (hereinafter, referred to as sheet light S). The forming device 14 is preferably provided with a processing drum 16.
Is a sheet light S that defines a line in the radial direction of the sheet light. Further, in the illustrated example, as a more preferable mode, the sheet light S
And the tape T are positioned so as to be orthogonal to each other in a plane. There is no particular limitation on such a molding machine 14, and various known optical systems (optical elements) that can use the laser beam as the sheet light S can be used. Specifically, an optical system combining a cylindrical lens and a collimator lens, an optical system combining a rod lens and a cylindrical lens (collimator lens), and the like are exemplified.

The sheet light S then enters the inside of the processing drum 16 from the end face thereof, is reflected by the mirror 22 disposed in the processing drum 16, enters the inside surface of the processing drum 16, and is processed on the inside surface. A line parallel to the axis of the drum 16 is defined. The mirror 22 is fixed to the rotation of the processing drum 16 (drum main body 24) described later by a known method such as being held by a stay inserted from the outside. Further, it is preferable that the mirror 22 is arranged at an angle of 45 ° with respect to the incidence of the sheet light S, that is, the sheet light S is reflected 90 ° by the mirror 22 and is incident perpendicularly on the inner surface. preferable.

The processing drum 16 basically includes a hollow cylindrical drum main body 24 and a support member 26.
2 (A) and 2 (C), the support member 26 is shown by a dotted line, and FIG.
In (C), the through holes 24a other than the cross section are omitted. The drum main body 24 is a cylinder having an open end surface at least on the incident side of the sheet light S. Further, the support member 26
The drum main body 24 is rotatably supported about the axis by a known means such as a bearing.

A large number of through-holes are formed in the side surface of the drum main body 24 so that a plurality of dotted lines extending in the circumferential direction (the direction of transport of the tape T) are arranged in the axial direction (the width direction of the tape T). 24a are formed. Therefore, as shown in FIG.
The sheet light S incident on the inner side surface of the sheet defines a line parallel to the axis on the inner side surface, and is emitted to the outside of the drum main body 24 when entering the through hole 24a. The processing pattern of the tape T may be adjusted according to the formation pattern of the through holes 24a.

The drum body 2 of such a processing drum 16
Reference numeral 4 rotates around the axis under the support of the support member 26, for example, by rotating means (not shown for simplicity of the drawing) such as a roller contacting the outer periphery and a belt wound around the outer periphery. As described above, since the mirror 22 is fixed with respect to the rotation of the processing drum 16 (drum main body 24), only the drum main body 24 rotates. Various known methods can be used for the rotating means of the drum main body 24. In addition to the above-described methods, for example, a rotation driving source of the drum main body 24 may be provided on the support member 26, and the tape T may be used as the drum main body. In the case of abutment or winding around the tape 24, the running of the tape T may be used as the rotating means.

In the processing device 10, the tape T is transferred to the processing drum 16 by the tape transport device 18.
(The side surface of the drum main body 24), the processing position W
While being transported in the longitudinal direction (conveyed in a predetermined direction with the transport direction x and the longitudinal direction coinciding). Further, the direction of transport of the tape T and the direction of rotation of the drum main body 24 coincide with each other.

The tape transport device 18 includes a guide roller 30
Member 2 for positioning tape or tape T at a predetermined processing position W
8 and other known tapes, which include not shown transport driving means such as a capstan roller, a rewinder, and a winder, and a means for regulating the width direction of the tape T such as a flanged roller and a crown roller. T is a transport device (traveling device). Alternatively, a rib or a flange may be provided at an end of the drum main body 24, and this may also serve as a position regulating unit in the width direction of the tape T.

The support member 28 includes two blades 32 disposed so as to sandwich the processing position W in the transport direction,
And a fixing member 34 for fixing and supporting the.
The blade 32 has, for example, a triangular prism shape in which the side ridges are arranged so as to coincide with each other in the width direction, and supports the tape T by lifting the tape T from below by the side ridges. (Axial direction).

Here, the processing position W is reflected by the mirror 22, defines a line parallel to the axis on the inner side surface of the drum main body 24, and passes through the through-hole 24a of the drum main body 24. It is set on the optical path. The rotation direction of the drum body 24 and the transport direction (longitudinal direction) of the tape T
And are consistent. In other words, unless the light is blocked by the drum body 24 of the processing drum 16, the sheet light S
Defines a line extending in the width direction on the back layer of the tape T transported in the longitudinal direction while being positioned at the processing position W by the tape transport device 18.

That is, in the processing apparatus 10 shown in the figure, the sheet light S emitted from the light source 12 and formed by the forming device 14 enters the drum body 24 from the end face, is reflected by the mirror 22, and is reflected by the drum body. A line parallel to the axis is defined on the inner surface of 24. Here, since the drum main body 24 is rotated about the axis, the portion of the sheet light S having a line defined on the inner surface and incident on the through-hole 24 a of the drum main body 24 passes through the drum main body 24. Then, a plurality of laser beams are incident on the tape T at the processing position W and the back layer is processed. That is, the drum body 24
Of the laser beam on the back layer is turned on /
is turned off. The tape T is transferred to the tape transport device
In the back layer of the tape T, the dotted line processing composed of the processing line segments a arranged in the width direction as shown in FIG. Done.

In the illustrated processing apparatus, the tape T and the drum main body 24 may be in non-contact or in contact with each other. Here, when the tape T and the drum main body 24 are not in contact with each other as in the illustrated example, the transport speed of the tape T and the rotation speed (peripheral speed) of the drum main body 24 need not necessarily match. Absent. Alternatively, in the case of non-contact, the drum body 24
The back layer processing pattern of the tape T may be changed or adjusted by adjusting the rotation speed of the tape T or the transport speed of the tape T (even during processing). When the tape T and the drum main body 24 are in contact with each other, it is preferable that the two speeds be the same in order to avoid damage to the tape T.
In this case, the drum main body 24 may also serve as a holding unit for holding the tape T at the processing position.

Here, the processing of the tape T by the processing apparatus 10 is very fine processing as described above. Therefore, if dust or foreign matter such as processing dust from the previous process adheres to the back layer of the tape T to be processed and is dirty, proper processing cannot be performed. On the other hand, in the processing apparatus 10 of the present invention, a cleaning device 20 that cleans and cleans the surface of the back layer is disposed upstream of the processing position W (in the tape T transport direction). The present invention, by having such a cleaning means, performs a proper processing of the magnetic tape back layer, does not slip even at high speed transport, less cupping, etc., a magnetic tape having excellent characteristics, stably. Can be made.

In the processing device 10, the cleaning device 20 cleans the surface of the back layer of the tape T with a cleaning tape 36 made of non-woven fabric, for example. The cleaning tape 36 is a long piece wound around a supply roll 38, sent out from the supply roll 38, and taken up by a take-up roll 40. In the middle of the transport path of the cleaning tape 36, the pressing member 42
The cleaning tape 36 is urged by the pressing member 42 and pressed against the back layer of the tape T.

The transport speed of the cleaning tape 36 from the supply roll 38 to the take-up roll 40 depends on the transport device 18
Is set to be lower than the transport speed of the tape T by the above. Therefore, the back layer of the tape T and the cleaning tape 36
And the back layer is cleaned by the cleaning tape 36.

The transport speed of the cleaning tape 36 is not particularly limited, and may be the same as that of a normal magnetic tape manufacturing facility, and may be appropriately set according to the transport speed and strength of the tape T. Further, the pressing force of the cleaning tape 36 is not particularly limited, and may be appropriately set according to the transport speed, strength, and the like of the tape T in the same manner as in a normal magnetic tape manufacturing facility. Further, the transport direction of the cleaning tape 36 may be opposite to the transport direction of the tape T.

In the processing apparatus 10 of the present invention, the cleaning position of the back layer by the cleaning means such as the cleaning tape 36 is not particularly limited as long as it is upstream of the processing position W. However, preferably, the position is such that the transport of the tape T at the processing position W is not affected, and as close to the processing position W as possible. That is, in the case of the processing apparatus 10 in the illustrated example, the upstream of the upstream blade 32 is most preferable.

In the processing apparatus 10 of the present invention, the means for cleaning the back layer of the tape T is not limited to a method using a cleaning tape made of a nonwoven fabric, and various known methods for cleaning the surface of a magnetic tape can be used. It is possible. As an example, a cleaning unit using an adhesive tape, a cleaning unit using an adhesive roller, and the like are preferably exemplified.

The processing apparatus 10 shown in FIG.
An optical system that splits the sheet light S with the processing drum 16 using the (sheet beam) forming device 14 and the processing drum 16 and enters the laser beam into the processing position W (the back layer of the tape T). To use. However,
In the present invention, at least one laser beam for processing the back layer of the tape T, preferably a plurality of laser beams, and more preferably a plurality of laser beams obtained by dividing one laser beam is processed at a processing position. The optical system that enters the W is not limited to the above-described example, and various optical systems having the above operation can be used.

FIG. 3 shows a conceptual diagram of another example of the (magnetic tape) processing apparatus of the present invention. Note that the example shown in FIG.
Since there are many parts common to the processing apparatus shown in FIG. 1, the same members are denoted by the same reference numerals, and the following description mainly focuses on different parts.

The processing apparatus 50 shown in FIG.
2. An optical system including a pulse modulator 52, a mirror 54, a beam expander 56, a beam profile shaper 58, and a multi-lens lens 60, a tape transport device 18, and a cleaning device 20. In such a processing apparatus 10, the laser beam is processed by the optical system while supporting the tape T at the processing position W and conveying (running) the tape T in the longitudinal direction (the direction of the arrow x in the drawing) by the tape conveying apparatus. By being incident on the position W, the back layer of the tape T is processed by the laser beam to form a processing line or the like extending in the longitudinal direction of the tape T as described above.

The light source 12 is the same as the processing device 10 described above. The pulse modulator 52 pulse-modulates a laser beam emitted from the light source 12 to form a processing line segment b or the like as shown in FIG.
Therefore, when the light source 12 can directly modulate,
In the case where only the processing line a as shown in (1) is formed, the pulse modulator 52 is unnecessary. Pulse modulator 52
A well-known modulation means such as an AOM (acoustic optical modulator) can be used. The processing line segment may be patterned by modulation.

The laser beam is reflected by the mirror 54 in a predetermined direction, and then enters the beam expander 56. The processing device 10 splits one laser beam,
A processing line or a processing line segment (hereinafter, collectively referred to as a processing line) is formed on the back layer of the tape T. However, from the viewpoint of efficiency, the processing line can be formed all over the width direction of the tape T at one time. Preferably it is. However, in general, the diameter of the laser beam emitted from the light source 12 is about 1 mm, and the tape T is thicker than that, so that it is impossible to process the entire area in the width direction as it is. Therefore, the processing device 10
Then, the beam expander 56 is arranged to expand the diameter of the laser beam emitted from the light source 12. For example, the light source 12
The diameter of the laser beam emitted from the
Is 0.5 in, the diameter of the laser beam may be expanded about 15 to 20 times.

The laser beam expanded in diameter by the beam expander 56 is then sent to a beam profiler 58.
(Hereinafter, referred to as a profile shaper 58).
The profile shaper 58 makes the intensity of the laser beam almost uniform over the entire beam spot, that is, makes the intensity distribution of the laser beam almost uniform. Light source 12
Since the laser beam emitted from the laser beam usually has an intensity distribution such as a Gaussian distribution, if the laser beam is divided and the tape T is processed, the depth of the processing line differs depending on the intensity distribution. Therefore, in the illustrated example, the profile forming device 5
8, the intensity distribution of the laser beam is made uniform, and the depth of the processing line to be formed is made uniform. As the profile shaper 58, various optical filters, an aperture having the same diameter as a laser beam for shaping a beam profile using Fresnel diffraction, a multi-lens lens, and the like can be used.

The laser beam is then applied to the multi-lens 60
Incident on. The multi-lens lens 60 is formed by arranging a large number of microball lenses and selfoc lenses in a direction perpendicular to the optical axis with its optical axis parallel to the laser beam. The light is divided, incident on the processing position W, and imaged. Thus, the back layer of the tape T is processed by the laser beam to form a processing line (recess).

FIG. 4 is a schematic diagram showing one example of the structure viewed from the optical axis direction. The multi-lens lens 60 in the illustrated example is, for example, a microball lens or a selfoc lens (hereinafter, both are collectively referred to as a lens) in which 5 × 5 lenses are arranged in a dense state, and is indicated by a chain line. The lenses are arranged with the arrangement line of the lenses slightly inclined with respect to the transport direction x and the width direction of the tape T. Thus, only one transport (one pass) of the tape T in the longitudinal direction can form a total of 25 (lines) processing lines extending in the longitudinal direction.

In this system, the interval between the processing lines can be adjusted by adjusting the angle between the transport direction x and the lens arrangement line. However, in order to form the processing line efficiently, this angle is It is preferable that the optical axis of the lens (the center of the beam waist) is set so as not to overlap in the transport direction x.

In the processing apparatus of the present invention, such an optical system is not limited to this example.
For example, an optical system disclosed in the specification of Japanese Patent Application No. 11-112676 filed by the present applicant can be used.

As an example, the optical system shown in FIG. 5 is exemplified. This example is different from the processing apparatus 50 shown in FIG. 3 in that the beam waist position adjusting means 62, the beam splitter 64, and the converging lens 66 are used instead of the multi-lens lens 60.
Is used. In FIG. 5, the tape T
Is transported at a processing position W in a direction perpendicular to the paper surface. In this optical system, the molding device 58 and the beam expander 56 are not always necessary.

After the beam waist position is adjusted by the beam waist position adjusting means 62, the laser beam is split in the width direction of the tape T (beam No. 1 to beam No. 1) according to the number of processing lines formed by the beam splitter 64. No. N). The split laser beam is converged and imaged by the converging lens 66 and is incident on the back layer of the tape T located at the processing position W. As a result, as in the previous example, a number of processing lines and the like are formed that extend in the transport direction (longitudinal direction) of the tape T according to the number of laser beams that have been divided and incident on the back layer of the tape T. .
In this optical system, each laser beam is adjusted by the beam waist position adjusting means 62 so that the beam waist position comes to the processing position W.

In the processing device 50, similarly to the above-described processing device 10, the tape T is transported by the transport device 18 with the back layer facing upward (toward the laser beam incidence side).
While being located at the processing position W, it is transported in the longitudinal direction (arrow x direction). Further, upstream of the processing position W, the processing apparatus 1
As in the case of the cleaning device 0, the cleaning device 20 is disposed. Therefore, the light beam incident on the processing position W causes the tape T
In the back layer, processing lines (recesses) extending in the longitudinal direction are formed. For example, in the example shown in FIG. 3, 25 processing lines are formed by one transfer (one pass). You. Also,
Similarly, according to the processing device 50 of the present invention, the back layer of the tape T to be processed is cleaned by the cleaning device 20 prior to processing, so that the back layer can be properly processed.

The above-described processing of the tape T according to the present invention may be performed at any time in the magnetic tape manufacturing process as long as the back layer is formed. For example, before the tape is cut into a product width by a slitter. Or after cutting.

In the processing apparatus of the present invention for processing a back layer by laser light, both heat by laser light and processing by ablation (dissociation and separation) are generated in a complex manner, and the back layer is processed. it is conceivable that.
Therefore, processing waste (dust, etc.) and harmful gas may be generated by this processing. In order to eliminate various inconveniences caused by these, a means for cleaning the surface of the processing drum 16 (drum main body 24), a means for cleaning the back layer of the processed tape T, a means for sucking gas, and the like may be provided. The cleaning means may be a known method used in a magnetic tape manufacturing apparatus or various processing apparatuses.

Although the magnetic tape processing apparatus of the present invention has been described in detail above, the present invention is not limited to the above-described example, and various modifications and changes can be made without departing from the gist of the present invention. Good.

[0051]

As described above in detail, according to the magnetic tape processing apparatus of the present invention, even when the transport speed is increased, the magnetic tape processing apparatus does not slip by the capstan roller or the like, and therefore, can transport at high speed and accurately. , And a magnetic tape having excellent characteristics with little cupping can be efficiently obtained. Moreover, according to the processing device of the present invention, the back layer of the tape is cleaned prior to the processing of the back layer, so that the proper processing of the back layer can be stably performed. By using the magnetic tape manufactured by such a processing apparatus of the present invention, high-speed and accurate tape conveyance can be performed in a magnetic tape manufacturing apparatus such as a blade machine, and as a result, under appropriate production management. , Stable production of magnetic tape with no damage, high quality of appearance when wound on cartridges and pancakes, and reduced tape appearance due to cupping, deterioration of head contact, Damage to the tape edge can also be prevented.

[Brief description of the drawings]

FIGS. 1A and 1B are conceptual diagrams showing an example of a back layer of a magnetic tape processed by a magnetic tape processing apparatus of the present invention.

2A is a conceptual diagram of an example of the magnetic tape processing apparatus of the present invention as viewed from the width direction of the tape, FIG. 2B is a conceptual diagram of the magnetic tape processing device as viewed from the longitudinal direction of the tape T, and FIG. ) Shows a schematic cross-sectional view of the processing drum of the apparatus.

FIG. 3 is a conceptual diagram of another example of the magnetic tape processing device of the present invention.

FIG. 4 is a conceptual diagram for explaining a multi-lens of the magnetic tape processing device shown in FIG. 3;

FIG. 5 is a conceptual diagram of an optical system of another example of the magnetic tape processing device of the present invention.

[Explanation of symbols]

 10, 50 (magnetic tape) processing device 12 light source 14 (sheet-like laser) forming device 16 processing drum 18 tape transport device 20 cleaning device 22 mirror 24 drum body 24a through hole 26 support member 28 holding member 30 guide roller 32 blade 34 fixed Member 36 Cleaning Tape 38 Supply Roll 40 Winding Roll 42 Pressing Member 52 Pulse Modulator 54 Mirror 56 Beam Expander 58 (Beam) Profile Shaper 60 Multi-Eye Lens 62 Beam Waist Position Adjusting Means 64 Beam Splitter 66 Convergent Lens

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // B23K 101: 16 B23K 101: 16

Claims (1)

[Claims] 1. An optical system for injecting one or more laser beams for processing a back layer of a magnetic tape into a predetermined processing position, and a back layer having a laser beam incident side while holding the magnetic tape at the processing position. A transport device for transporting in the longitudinal direction,
A magnetic tape processing device, comprising: a cleaning unit for cleaning a back layer of the magnetic tape, which is disposed upstream of a processing position in a magnetic tape transport direction by the transport device.