(19) Japanese Patent Office (JP)
`
`(51) Int. Cl.6
`G11B
`
`23/107
`
`(12) Unexamined Patent Gazette (A)
`(11) Unexamined Patent Application (Kokai) No.: H11-273307
`(43) Publication Date: October 8, 1999
`FI
`G11B 23/107
`
`ID Symbol
`
`(22) Filing Date: March 18, 1998
`
`Request for Examination: Not Requested Number of Claims: 2 FD (7 Pages Total)
`(21) Application Number: H10-90784
`(71) Applicant: 000005810
`Hitachi Maxell, Ltd.
`1-1-88 Ushitora, Ibaraki City, Osaka
`(72) Inventor: Mizutani, Hikaru
`Hitachi Maxell, Ltd.
`1-1-88 Ushitora, Ibaraki City, Osaka
`(74) Representative: Oriyose, Takeshi; Attorney
`Continued on Last Page
`
`(54) Name of Invention: Single Reel Type Magnetic Tape Cartridge
`
`(57) Abstract
`Problem: In a single reel type magnetic tape
`cartridge provided with a reel lock mechanism,
`to improve lock release reliability and durability
`during use.
`
`Solution Means: A lock release member 21, a
`lock member 19, and a spring 20 are disposed
`between a tape reel 2 hub bottom wall 11 and a
`main body case 1 top wall 12. A plurality of leg
`pieces 35 provided to the lock release member
`21 protrude downward from a hub bottom wall
`11 leg piece protrusion hole 37. During use,
`when a tape drive drive shaft D operates the lock
`release member 21 by pressing it upward via the
`leg pieces 35, the lock member 19 is pressed
`upward in a horizontal position without tilting,
`releasing engagement of the hub bottom wall 11
`with a lock tooth 25.
`
`SONY Exhibit 1006
`SONY v. FUJI
`
`

`

`(2)
`
`Unexamined Patent App. Pub. H11-273307
`
`Claims
`[Claim 1] In a magnetic tape cartridge with one tape reel 2
`rotatably housed in the interior of a main body case 1 over a
`drive shaft insertion port 18 on a case bottom wall 17,
`the tape reel 2 having a bottomed cylindrical hub 10 with a
`top surface opening at the center, and the outer bottom
`surface of a hub bottom wall 11 of this hub 10 facing the
`drive shaft insertion port 18,
`providing a reel lock mechanism which prevents free rotation
`of the tape reel 2 during non-use, between the hub bottom
`wall 11 inner top surface and the main body case top wall 12,
`a single reel type magnetic tape cartridge in which
`said reel lock mechanism is provided with a lock member 19
`which is linked and guided by a guide protrusion 27 provided
`on the interior of the top wall 12 such that vertical sliding is
`enabled, but relative rotation is disabled, a spring 20 applying
`downward pushing force on the lock member 19, and a lock
`release member 21 disposed between the lock member 19
`and the hub bottom wall 11 inner top surface,
`the lock member 19 having a cylindrical body built into the
`hub 10 interior in concentric circle form, and a spring
`receiving wall 23 provided in the interior of this cylindrical
`body 22,
`respectively providing on the bottom end surface of the
`cylindrical body 22 and the inner top surface of the hub
`bottom wall 11, lock teeth 24 and 25, which mutually engage
`protrusions and recesses to prevent rotation of the tape reel 2,
`the lock release member 21 is disposed between the bottom
`surface of the spring receiving wall 23 in the cylindrical body
`22 and the hub bottom wall 11 inner top surface, and is
`provided with a base 34 comprising abrasion tolerant
`synthetic resin, a metal plate 36 layered on the top surface of
`the base 34, and a plurality of same length leg pieces 35
`provided protruding downward from the base 34,
`each leg piece 35 respectively protrudes a bottom edge
`thereof downward from the outer bottom surface of the hub
`bottom wall 11 via leg piece protrusion holes 37 provided in
`the hub bottom wall 11,
`the spring receiving wall 23 bottom surface and the metal
`plate 36 top surface are in point contact via a protrusion 30
`provided protruding from the center of one or the other of
`either the spring receiving wall 23 bottom surface or the
`metal plate 36,
`and the hub bottom wall 11 outer bottom surface is annularly
`provided with drive teeth 14 on the outer periphery area
`beyond said leg piece protrusion holes 37, which engage with
`drive teeth 16 on a tape drive drive shaft D.
`[Claim 2] A single reel type magnetic tape cartridge
`described in Claim 1, in which the plurality of leg pieces 35
`are provided arranged at positions equidistant from the base
`34 bottom surface center and at mutually equal intervals.
`
`Detailed Description of the Invention
`[0001]
`Technical Field of the Invention
`This invention is related to a single reel type magnetic tape
`cartridge represented by magnetic recording media for
`computer data recorders, with improvement of a reel lock
`mechanism thereof.
`
`[0002]
`Prior Art
`In this type of magnetic tape cartridge, there are those
`provided with a reel lock mechanism in the form shown in
`Fig. 6. Here, a tape reel 53 comprises an upper flange 50, a
`lower flange 51, and a cylindrical hub 52 formed integrated
`with the lower flange 51, and free rotation of the tape reel 53
`during non-use is prevented by a lock member 54 positioned
`inside the hub 52. To the bottom surface center of the hub 52
`inner bottom wall is secured an iron plate 55 which is
`magnetically attracted to a drive shaft in a tape drive, and
`drive teeth 56 are provided on its periphery wall to engage
`with drive teeth on the tape drive drive shaft.
`[0003] The lock member 54 has a circular seat plate 58 for
`receiving the bottom end of a compression coil-shaped coil
`57, and the top and bottom of the center portion of the seat
`plate 58 have a slide boss 59 and a passive pin 60. The slide
`boss 59 is guided to engage with a guide protrusion 63
`provided on an upper wall 61 of the main body case 1 to
`enable vertical sliding but to disable rotation. The bottom
`surface of the seat plate 58, and the top surface of the seat 62
`provided to protrude in the interior bottom of the hub 52,
`have mutually engaging lock teeth 64 and 65. Therefore in
`the state when the lock teeth 64 and 65 are mutually engaged,
`the tape reel 53 cannot rotate. During use, the passive pin 60
`exposed at the bottom surface center of the tape reel 53 is
`thrust upward by the tape drive drive shaft, releasing the
`mutual engagement of
`the
`lock
`teeth 64 and 65.
`Simultaneously, the tape reel 53 is magnetically attracted
`onto the drive shaft via the iron plate 55, and the rotation
`force thereof is transmitted to the tape reel 53 via the drive
`teeth 56.
`[0004]
`Problem the Invention Seeks to Solve
`In said tape cartridge, because the lock member 54 passive
`pin 60 is directly thrust upward by the drive shaft to
`disengage the mutual engagement status of the lock teeth 64
`and 65, the lock status sometimes is not reliably released. In
`the status when the lock member is operated to separate
`above the seat 62, the entire lock member 54 may tilt and the
`lock teeth 64 on the seat plate 58 and the lock teeth 65 on the
`seat 62 may be abutting and engaged at the lower end of the
`tilt. When this occurs, the drive shaft will spin free and
`cannot reliably rotationally drive the tape reel 53.
`[0005] The guide protrusion 63 engages with the slide boss
`59, and thus is useful for suppressing tilting movement of the
`lock member 54. However, to smoothly vertically slide the
`lock member, there must be a certain amount of clearance
`maintained between the slide boss 59 and the guide
`protrusion 63 sliding surfaces, and lock member 54 tilt
`motion for this clearance amount cannot be avoided. This is
`also a factor for the lock member 54 to tilt. As previously
`described, if the lock release for the tape reel 53 remains
`insufficient, abnormal tension operates on the magnetic tape,
`leading to severe incidents such as tape breaks. Also, the lock
`teeth 64 and 65 could become missing or damaged, or
`abnormally abraded, making the reel lock unreliable.
`
`

`

`(3)
`[0006] The purpose of the present invention is to always
`reliably switch the reel lock mechanism to the lock release
`status, to prevent operation that would pull out the magnetic
`tape outside of the case while still in reel lock status, thus
`resolving occurrences of major incidents such as tape breaks,
`missing or damaged
`lock
`teeth, etc., and
`improving
`reliability. Another purpose of the present invention is to
`provide a single reel type magnetic tape cartridge which
`enables improving durability of the lock release member.
`[0007]
`Means of Solving the Problem
`The magnetic tape cartridge in the present invention, as
`shown in Fig. 1 and Fig. 2, has one tape reel 2 rotatably
`housed in a main body case 1 on a drive shaft insertion port
`18 on a case bottom wall 17, and a reel lock mechanism for
`preventing free rotation of the tape reel 2 during non-use is
`provided between the hub bottom wall 11 inner top surface of
`a hub 10, provided at the center of the tape reel 2, and a main
`body case 1 top wall 12. This reel lock mechanism provides,
`as shown in Fig. 1: a lock member 19 which is guided to
`engage with a guide protrusion 27, provided on the main
`body case 1 upper wall 12 interior surface such that vertical
`sliding is enabled but relative rotation is disabled; a spring 20
`applying downward pressing force on the lock member 19;
`and a lock release member 21 disposed between the lock
`member 19 and the hub bottom wall 11 inner top surface.
`[0008] The lock member 19 is provided with a cylindrical
`body 22 built into the hub 10 interior in concentric circle
`form, and a spring receiving wall 23 provided in the interior
`of this cylindrical body 22. And on the bottom end surface of
`the cylindrical body 22 and the inner top surface of the hub
`bottom wall 11 are respectively provided lock teeth 24 and
`25, which mutually engage protrusions and recesses to
`prevent rotation of the tape reel 2.
`[0009] Said lock release member 21 is disposed between the
`bottom surface of the spring receiving wall 23 in the
`cylindrical body 22 and the hub bottom wall 11 inner top
`surface, and is provided with a base 34 comprising abrasion
`tolerant synthetic resin, a metal plate 36 layered on the top
`surface of the base 34, and a plurality of same length leg
`pieces 35 provided protruding downward from the base 34.
`Each leg piece 35 protrudes a bottom edge thereof downward
`from the outer bottom surface of the hub bottom wall 11 via
`leg piece protrusion holes 37 provided in the hub bottom wall
`11. The plurality of leg pieces 35 are provided arranged at
`positions equidistant from the base 34 bottom surface center
`and at mutually equal intervals.
`[0010] The spring receiving wall 23 bottom surface and the
`metal plate 36 top surface are in point contact via a
`protrusion 30 provided protruding from the center of one or
`the other of either the spring receiving wall 23 bottom
`surface or the metal plate 36. The hub bottom wall 11 outer
`bottom surface is annularly provided with drive teeth 14 on
`the outer periphery area beyond said leg piece protrusion
`holes 37, which engage with drive teeth 16 on a tape drive
`drive shaft D.
`[0011]
`Operation
`During non-use, as shown in Fig. 1 the tape reel 2 is engaged
`via the lock teeth 24 and 25 with the lock member 19 which
`
`Unexamined Patent App. Pub. H11-273307
`
`is energized downward by the spring 20, and is thus held
`with rotation disabled. The lock release member 21 has its
`leg pieces 35 protruding downward from the outer bottom
`surface of the hub bottom wall 11 via the leg piece protrusion
`holes 37. When leg pieces 35 in this condition are subjected
`to an upward push operation of the tape drive drive shaft D,
`as shown in Fig. 3 the lock member 19 is pressed upward in
`opposition to the spring 20, the lock teeth 24 and 25 mutually
`separate, and the reel lock status is released.
`[0012] The purpose of performing an upward push operation
`of the lock member 19 via the lock release member 21 is to
`enable the lock member 19 to always be horizontal during the
`upward push operation. For this purpose, the lock release
`member 21 is provided with a plurality of same-length leg
`pieces 35 which are subjected to an upward push operation
`by the drive shaft D. For example, when directly performing
`an upward push operation of the lock member 19 with the
`drive shaft D, if the center of the lock member 19 and of the
`drive shaft D are not correctly matched, the lock member 19
`will tilt in some diameter direction. But if an upward push
`operation is performed to the lock release member 21 via a
`plurality of same-length leg pieces 35, even if there is a
`minimal amount of position shift between the center of the
`lock release member 21 and the drive shaft D, the lock
`release member 21 can be pushed upward horizontally. Thus,
`the lock member 19 can be pushed upward horizontally for
`the amount that the lock release member 21 was pushed
`upward, and its lock teeth 24 will reliably separate from the
`lock teeth 25.
`[0013] A metal plate 36 is layered on the top surface of the
`base 34 of the lock release member 21, and the metal plate 36
`and the spring receiving wall 23 bottom surface are in point
`contact via a protrusion 30 provided protruding from the
`center of one or the other of either the spring receiving wall
`23 bottom surface or the metal plate 36. Therefore, even
`during high speed rotation of the tape reel 2, friction
`resistance can be reduced between the tape reel 2 and the
`simultaneously rotating lock release member 21 and the
`stopped lock member 19, and effectively prevents friction
`damage on the lock member 19 and the lock release member
`21.
`[0014] Leg pieces 35 of the lock release member 21 are
`formed with abrasion tolerant synthetic resin, and does not
`cause missing, lost, or damaged drive teeth 16 on the drive
`shaft D, and effectively prevents abrasion damage caused by
`sliding motion of leg pieces 35 and the drive shaft D top
`surface. The metal plate 36 effectively reinforces the base 34
`made of abrasion tolerant synthetic resin, and even when the
`lock release member 21 is made thinner to accommodate a
`very narrow space, its deformation can be prevented, and the
`lock member 19 upward pushing function can be stably and
`reliably attained.
`[0015]
`Embodiment
`Fig. 1 to Fig. 4 show one embodiment of a single reel type
`magnetic tape cartridge in the present invention. In Fig. 2, the
`magnetic tape cartridge houses one tape reel 2 in the interior
`of a rectangular box shaped main body case 1, and a
`magnetic tape 3 (simply called tape hereafter) is wrapped
`around the tape reel 2. The tape 3 feeding end is linked to a
`
`

`

`(4)
`
`Unexamined Patent App. Pub. H11-273307
`
`loading pin 4 which performs the tape 3 extraction operation.
`The loading pin 4 is housed to the interior of the tape
`extraction port 5 opening at the front right corner of the main
`body case 1, and both the top and bottom ends are positioned
`by being engaged and held by holders 6 and 6. The tape
`extraction port 5 can be opened and closed by a shutter 7 that
`can freely slide open and closed.
`[0016] As shown in Fig.1, the tape reel 2 comprises an upper
`flange 8, a lower flange 9, and a bottomed cylindrical hub 10
`open in the upward direction molded and integrated with the
`lower flange 9. The upper flange 8 is fixed by welding to the
`top end of the hub 10 to prevent separation. A reel lock
`mechanism for preventing free rotation of the tape reel during
`non-use is disposed between the tape reel 2 hub bottom wall
`11 inner top surface and the main body case top wall 12. A
`magnetic body 13 such as a circular iron plate is fixed to the
`center of the hub bottom wall 11 outer bottom surface, and
`drive teeth 14 are annularly provided in a state surrounding
`the perimeter of the magnetic body 13 (see Fig. 4). The drive
`teeth 14 are formed as one group of gear teeth extending in
`the radiating direction, which engage with drive teeth 16
`provided around the perimeter of a magnet 15 provided on
`the top end surface of the tape drive drive shaft D, receiving
`the rotation force of the drive shaft D. The drive teeth 14 are
`exposed on the case outer surface via a drive shaft insertion
`port 18 provided in the case bottom wall 17.
`[0017] In Fig. 1 and Fig. 3, the reel lock mechanism
`comprises the tape reel 2 hub bottom wall 11, a lock member
`19 assembled into the space between this and the opposing
`main body case 1 top wall 12 thereabove, a compression coil
`shaped spring 20 disposed between the lock member 19 and
`the top wall 12, a lock release member 21 disposed between
`the lock member 19 and the hub bottom wall 11 inner top
`surface, etc.
`[0018] The lock member 19 has a cylindrical body 22 built
`into the interior of the tape reel 2 hub 10 in concentric circle
`form, and a horizontal spring receiving wall 23, formed
`integrated in the interior of this cylindrical body 22, and is
`provided with lock teeth 24 around the entire circumference
`of the bottom end of the cylindrical body 22, and these lock
`teeth 24 engage with lock teeth 25 provided in a radiating
`manner in the outer perimeter area of the inner top surface of
`the hub bottom wall 11.
`[0019] A cylindrical slide boss 26 is provided to the spring
`receiving wall 23 top surface center protruding upward, and
`this slide boss 26 is externally fitted to a guide protrusion 27
`provided to the top wall 12 inner surface in a hanging
`manner. A vertical groove 28 is placed at a portion of the
`circumference at the top end of the slide boss 26, and by
`fitting this vertical groove 28 onto a vertical rib 29 provided
`at a portion of the circumference of the guide protrusion 27,
`the lock member 19 is linked and guided by the guide
`protrusion 27 such that vertical sliding is enabled, but relative
`rotation is disabled. Regarding this feature, for example the
`slide boss 26 hole can be formed in a polygon, and the guide
`protrusion 27 can be formed to have a corresponding polygon
`cross section.
`[0020] The lock member 19 prevents rotation of the tape reel
`by the lock teeth 24 engaging with the lock teeth 25 in the
`hub 10. The tape reel 2 rotation prevention status is
`
`maintained by a spring 20 mounted between the top wall 12
`and the spring receiving wall 23 in a state of surrounding the
`outer perimeter of the guide protrusion 27 and the slide boss
`26, and is held by [the spring 20] applying downward
`pushing force.
`[0021] To make the vibration resistance as small as possible
`between the spring receiving wall 23 and the lock release
`member 21 during tape reel 2 rotation drive, the lock member
`19 spring receiving wall 23 bottom surface center provides a
`conical or partial spherical protrusion 30. By this protrusion
`30, the lock member 19 spring receiving wall 23 bottom
`surface and the lock release member 21 top portion are
`brought into point contact. In the example shown in the
`figure, the protrusion 30 is provided to the center of the
`bottom surface of a round plate 31 separate from the lock
`member 19, and this round plate 31 is stacked against the
`spring receiving wall 23 bottom surface, and is secured by a
`plurality of engaging tabs 32 provided on the round plate 31
`being inserted and engaged into engaging holes 33 provided
`in the spring receiving wall 23, thus setting the protrusion 30
`at the spring receiving wall 23 bottom surface center
`position. By thus forming the lock member 19 and the
`protrusion 30 separately and then integrating the two, the
`material of the two can be changed. For example, the
`protrusion 30 which requires abrasion tolerance can be
`molded of polyacetal or other resin, and the lock member 19
`can be molded of cheaper ABS resin, PS resin, etc.
`[0022] The lock release member 21 is molded with a circular
`base 34 from synthetic resin with superior abrasion tolerance
`and self-lubrication such as acetal resin, nylon resin, etc.,
`integrated with a plurality (three shown in the figure) of
`same-length leg pieces 35 which are provided protruding
`downward from [the base 34] bottom surface starting near the
`outer periphery end. Each leg piece 35 is at an equidistant
`position from the base 34 bottom surface center, and is
`provided protruding at mutually equal intervals. That is, as
`shown in Fig. 4, a plurality of leg pieces 35 is provided at
`equal intervals on the same virtual circle C drawn centered
`on the bottom surface of the base 34.
`[0023] A metal plate 36 is layered and integrated on the top
`surface of this base 34. The metal plate 36 is molded as an
`insert on the top surface of the base 34 simultaneous with the
`molding thereof. Although, the metal plate 36 can be
`integrated by adhering with adhesive to the top surface of the
`base 34 instead.
`[0024] The lock release member 21 base 34 is received and
`supported by the hub bottom wall 11 inner top surface, and
`each leg piece 35 protrudes downward from the hub bottom
`wall 11 outer bottom surface via a leg piece protrusion hole
`37 in the hub bottom wall 11. The leg piece protrusion holes
`37 are provided positioned between the hub bottom wall 11
`drive teeth 14 and the magnetic body 13.
`[0025] In the reel lock mechanism comprised as above, as
`shown in Figure 1, the lock member 19 is held by the guide
`protrusion 27 to disable rotation, and is always pushed down
`by the spring 20. Further, the lock teeth 24 and 25, provided
`to the lock member 19 and the hub bottom wall 11, are
`mutually engaged. Therefore, the tape reel 2 in non-use status
`can be held locked with rotation disabled.
`[0026] During use, loading this into a tape drive will open the
`
`

`

`Unexamined Patent App. Pub. H11-273307
`
`lock
`
`release member 21, which
`
`is
`
`the
`rigidity of
`advantageous.
`[0031] Upon lock release, because a plurality of leg pieces 35
`are subjected to a pushing upward operation at a position
`separated from the reel center, the lock release member 21
`tilting in a diameter direction can be reliably prevented,
`enabling performing a pushing upward operation stably
`supporting the lock member 19 horizontally, and the tape reel
`2 lock release can be reliably performed.
`
`Brief Description of the Drawings
`Figure 1: This is a section view along line A-A in Figure 2.
`Figure 2: This is an internal plane view of a magnetic tape
`cartridge.
`Figure 3: This is a vertical section front view of the lock
`release status.
`Figure 4: This is an arrow view along line B-B in Figure 1.
`Figure 5: This is a vertical section front view of another
`embodiment corresponding to Figure 1.
`Figure 6: This is a vertical section front view showing a
`comparison example of a reel lock mechanism.
`
`Description of the Symbols
`1
`Main body case
`2
`Tape reel
`10
`Hub
`11
`Hub bottom wall
`12
`Main body case top wall
`14
`Tape reel drive teeth
`16
`Drive shaft drive teeth
`17
`Case bottom wall
`18
`Drive shaft insertion port
`19
`Lock member
`20
`Spring
`21
`Lock release member
`22
`Cylindrical body
`23
`Spring receiving wall
`27
`Guide protrusion
`30
`Protrusion
`34
`Base
`35
`Leg piece
`36
`Metal plate
`37
`Leg piece protrusion hole
`D
`Drive shaft
`
`(5)
`shutter 7 and the loading pin 4 is captured by the loading
`mechanism. Simultaneously, as shown in Figure 3, the tape
`reel 2 is attracted downward against a magnet 15 on the
`driveshaft D via the magnetic body 13, and simultaneously
`the drive shaft D drive teeth 16 and the tape reel 2 drive teeth
`14 are engaged. When performing this engagement operation,
`the lock release member 21 leg pieces 35 are thrust upward
`by the drive shaft D, and are pushed inside the leg piece
`protrusion holes 37. Thus, the lock release member 21 pushes
`the lock member 19 upward in opposition to the spring 20,
`mutually separating the lock teeth 24 and 25 that were thus
`far engaged, releasing the reel lock status. As a result, the
`tape reel 2 becomes rotatable and tape extraction or rewind
`drive can be performed. Thereafter when the drive shaft
`separates from the tape reel 2, the tape reel 2 stays locked.
`[0027] In the embodiment above, a protrusion 30 separate
`from the spring receiving wall 23 was provided at the bottom
`surface center of the spring receiving wall 23, but a
`protrusion 30 can instead be molded and integrated to
`protrude at the spring receiving wall 23 bottom surface
`center. When doing so, it is preferable to mold the lock
`member 19 from polyacetal resin etc. having abrasion
`tolerance and self-lubrication. As shown in Figure 5, the
`bottom surface of the spring receiving wall 23 can be formed
`flat, and a protrusion 30 can be formed mounded upward at the
`center of the metal plate 36 on the lock release member 21.
`[0028]
`Effect of the Invention
`According to this invention, a lock release member 21 is
`disposed between a lock member 19 and a hub bottom wall
`11, and by performing a pushing up operation with drive
`shaft D on a plurality of leg pieces 35 provided on the lock
`release member 21, the reel lock status by the lock member
`19 can be released. Therefore, because the lock member 19
`can be prevented from tilting during the lock release
`operation, the lock teeth 24 on the lock member 19 will
`reliably separate from the lock teeth 25 on the hub bottom
`wall 11. Thus, an extraction operation of the tape 3 while the
`tape reel 2 is still locked can be prevented, and incidents such
`as tape breaks can be prevented.
`[0029] The lock release member 21 comprises a composite
`body, of a base 34 comprising an abrasion tolerant synthetic
`resin, and a metal plate 36. The top surface of the lock release
`member 21 which performs a pushing up operation on the
`lock member 19 is comprised of a metal plate 36, and by
`providing a protrusion 30 on one or the other of either the
`center of this metal plate 36 or on the spring receiving wall
`23 bottom surface center, the metal plate 36 and the spring
`receiving wall 23 are in point contact. Therefore, even during
`high speed rotation of the tape reel 2, friction resistance
`between the lock member 19 and the lock release member 21
`can be reduced, with superior durability against friction, and
`durability can be improved.
`[0030] Because the lock release member 21 leg pieces 35 are
`formed of abrasion tolerant synthetic resin, this does not
`cause missing, lost, or damaged drive teeth 16 on the drive
`shaft D, and can prevent abrasion damage to the leg pieces 35
`from sliding motion with the top end surface of the drive
`shaft D, and this
`feature
`is superior
`in durability.
`Reinforcement by the metal plate 36 enables increased
`
`

`

`Unexamined Patent App. Pub. H11-273307
`
`(6)
`
`Figure 1
`
`Figure 2
`
`Figure 4
`
`Figure 6
`
`

`

`(7)
`
`Unexamined Patent App. Pub. H11-273307
`
`Figure 3
`
`Figure 5
`
`

`

`JP 1999-273307 A5 2005.7.28
`
`Bulletin Type: Publication of amendment according to provisions of the Patent Act, Article 17-2
`Department Segment: Department 6, Segment 4
`Issued: July 28, 2005
`
`KOKAI Number: KOKAI H11-273307
`KOKAI Date: October 8, 1999
`Application Number: Patent Application H10-90784
`International Patent Classifications, Version 7:
`G11B
`23/107
`
`FI:
`
`G11B
`
`23/107
`
`Amendment:
`Date Submitted: December 20, 2004
`Amendment 1
`Document to be Amended: Specification
`Item to be Amended: Claims
`Amendment Method: Change
`Amendment Content:
`Claims
`Claim 1
`In a magnetic tape cartridge with a tape reel 2 rotatably housed in the interior of a main body case 1, over a drive
`shaft insertion port 18 on a case bottom wall 17,
`the tape reel 2 having a bottomed cylindrical hub 10 with a top surface opening at the center, and the outer bottom
`surface of a hub bottom wall 11 of this hub 10 facing the drive shaft insertion port 18,
`providing a reel lock mechanism which prevents free rotation of the tape reel 2 during non-use, between the hub
`bottom wall 11 inner top surface and the main body case top wall 12,
`a single reel type magnetic tape cartridge in which said reel lock mechanism is provided with a lock member 19
`which is linked and guided by a guide protrusion 27 provided on the interior of the top wall 12 such that vertical sliding
`is enabled, but relative rotation is disabled, a spring 20 applying downward pushing force on the lock member 19, and a
`lock release member 21 disposed between the lock member 19 and the hub bottom wall 11 inner top surface,
`the lock member 19 having a cylindrical body built into the hub 10 interior, and a spring receiving wall 23 provided
`in the interior of this cylindrical body 22,
`respectively providing on the bottom surface of the cylindrical body 22 and the inner top surface of the hub bottom
`wall 11, lock teeth 24 and 25, which mutually engage protrusions and recesses to prevent rotation of the tape reel 2,
`the lock release member 21 is disposed between the bottom surface of the spring receiving wall 23 in the cylindrical
`body 22 and the hub bottom wall 11 inner top surface, and is provided with a base 34 comprising synthetic resin, a
`metal plate 36 layered on the top surface of the base 34, and a plurality of same length leg pieces 35 provided
`protruding downward from the base 34,
`a bottom edge of each leg piece 35 respectively protrudes downward from the outer bottom surface of the hub
`bottom wall 11 via leg piece protrusion holes 11 provided in the hub bottom wall 11,
`the spring receiving wall 23 bottom surface and the metal plate 36 top surface are in point contact via a protrusion 30
`provided protruding from the center of one or the other of either the spring receiving wall 23 bottom surface or the
`metal plate 36.
`[Claim 2]
`A single reel type magnetic tape cartridge described in Claim 1, in which the base 34 and the leg pieces 35 of the
`lock release member are molded from an abrasion tolerant synthetic resin.
`
`

`

`I,
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`E QCAe { Z. Burhf 2 , hereby declare:
`
`That i possess advanced knowledge of the Japanese and English languages. The attached Japanese into
`English translation has been translated by me and to the best ofmy knowledge and belief, it is a true and
`accurate translation ofJapanese Patent Application No.: H] 1-273307, published October 8, 1999.
`
`I declare that all statements made above of my own knowledge are true and that all statements made on
`information and beliefare believed to be true. [ have been warned and understand that willful false
`
`statements and the like are punishable by fine or imprisonment, or both, under § 1001 of Title 18 of the
`United States Code.
`
`I declare (or certify, verify, or state) under penalty of perjury that the foregoing is true and correct.
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`Executed on 00h? be!“ 2 ‘7 ,2017 in Leland, North Carolina.
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`-«
`
`[2’
`
`DEBORAH G. DEMONTE
`,.
`"-- Notary Public, North Carolina
`Brunswick County
`My Commission xpire
`May 26,9;
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`Certification #426116
`
`Rachel Burney
`Japanese into English
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`Verify at new. atanet. orgNerify
`
`