CN1148753C - Tape cassette - Google Patents

Abstract

The present invention provides a miniature cassette magnetic tape having the advantages of easy assembly and tape transporting speed precision stabilization in the manufacturing process. The front wall of the inner part of an outer shell is provided with five openings along a magnetic tape processing path. In order to be easily assembled, horizontal dividing lines positioned at the front half parts of the left and the right walls approach to the side wall at the lower side in the miniature cassette magnetic tape of a cassette magnetic tape with two openings provided with two magnetic tape gaskets corresponding to both sides of the center; supporting columns among the five openings are formed on the side wall at the upper side; magnetic tape guide pins and magnetic tape guide wheels are arranged on the side wall at the lower side. In order to stabilize the precision of the magnetic tape transporting speed, the size of a gasket spring, the endowed capability of the magnetic tape, the positions of the magnetic tape gaskets, materials of various magnetic tape contacting parts, the shape and the weight of each magnetic tape guide wheel, the shape of a wheel hub hole, etc. are selected.

Description

Magnetic tape cassette

The application is the division of No.94105270.2 (magnetic tape cassette applying date 1994.3.30).

The present invention relates to a kind of magnetic tape cassette, particularly relate to have shell, the magnetic tape cassette of a pair of wheel hub, tape and leaf spring, wherein, shell includes in parallel to each other between the periphery of pair of sidewalls that configuration is formed with a pair of wheel bore in opposite directions respectively, sealing pair of sidewalls perisporium and at the bearing of trend of a part of upper edge of perisporium perisporium mutually and 5 magnetic heads/pinch roller patchhole of row arrangement at interval; A pair of wheel hub is configured in the inner space of shell, the a pair of wheel bore separately of the pair of sidewalls of shell rotates the two ends of supporting wheel hub freely: tape is configured in the inner space of shell, its two ends are fixed on a pair of wheel hub, and 5 magnetic heads/pinch roller patchhole along shell extends between a pair of wheel hub, is wrapped in selectively on the side face of a pair of wheel hub; Leaf spring comprises middle body and two end portions, middle body is positioned in the inner space of shell corresponding to the magnetic head that is in central part/pinch roller patchhole place, and be fixed between a pair of wheel hub the more inner place of tape segment along 5 magnetic heads/pinch roller patchhole, the long side direction of two end portions from middle body along case peripheral wall extends and imposes elastic force towards the above-mentioned part of tape, and two end portions is provided with the tape pad on two positions corresponding to 2 magnetic heads/pinch roller patchhole that is in central magnetic head/pinch roller patchhole both sides.

The magnetic tape cassette of Gou Chenging is commonly referred to as than the littler microcassette of the accurate tape of what is called as mentioned above, is used for for example can being contained in the sound-track engraving apparatus of hand size of Y type shirt breast pocket.

The employed tape of microcassette that is used for the information record and resets, if when being contained in the position as the regulation in the recording/displaying device of blattnerphone, the capstan that the pair of sidewalls inherence that the capstan of said apparatus just is inserted into shell forms on the position of the central magnetic head/pinch roller patchhole of perisporium inserts in the hole, simultaneously, a pair of reel shaft of said apparatus inserts in a pair of wheel hub.

When said apparatus is set at replay mode (PLAY), the reel shaft of one side and capstan along the regulation direction in accordance with regulations speed begin the rotation, simultaneously, pinch roller inserts central magnetic head/pinch roller patchhole, seize tape on both sides by the arms with the capstan concerted action, as a result, rely on capstan and pinch roller co-operate and tape from the periphery of the corresponding opposite side wheel hub of opposite side reel shaft that freely rotates on move in the middle of them with the speed of stipulating.Tape is pressed between capstan and pinch roller after the discharge of afore mentioned rules speed, just be wound up on its periphery by a side wheel hub corresponding to a side reel shaft that rotates driving than capstan speed quickly, each reel shaft is equipped with free-wheeling mechanism in all, along with the increase that is wound on the tape diameter on the side wheel hub periphery, the rotating speed of wheel hub is then slack-off, and free-wheeling mechanism absorbs the poor of slack-off hub rotation speed and this side reel shaft rotating speed.

When record and/or playback head begin as playback head, it just is inserted into inserting in the hole of tape direct of travel upstream side that 2 magnetic head/pinch rollers being positioned at central magnetic head/pinch roller patchhole both sides insert in the hole, on the tape pad of inside, and record and/or playback head are reset from the tape of advancing along a direction and are previously recorded in information on the tape the tape roof pressure.

When said apparatus is set at record (REC) pattern, under the situation of above-mentioned replay mode, again erase head is inserted into the inserting in the hole of tape running direction upstream one side of 2 magnetic heads/pinch roller patchhole of 5 magnetic heads/pinch roller patchhole two outer ends, tape square roof pressure in the shell, and record and/or playback head are as write head, being previously recorded in after information on the tape or noise erase, by record and/or playback head new information is recorded on the tape that moves along a direction again.

When said apparatus is set in F.F. (FF) pattern or fast (REW) pattern, at least pinch roller is not inserted in central magnetic head/pinch roller and inserts in the hole, the rotation of the wheel hub of of driving corresponding to rotation of dependence or another reel shaft or another, tape is pulled out from the wheel hub corresponding to another or of one or one reel shaft that freely rotates just, twist on the circumference of hub face of above-mentioned or another.The diameter of the tape that is rolled is big more, and the gait of march of tape is fast more.

Cleaning cassette therefor in order to the stain on the tape slipping plane of removing magnetic head and erase head also is well-known, and what be used as belt in this tape is to be coated in epilamellar cleaning tape with the magnetic on the material replacement tape of abrasive substance and washing agent and so on.

As the micro cassette of above-mentioned structure because also littler than the physical dimension of the accurate tape of what is called, and tape base is also thin, so the tape gait of march is subjected to the influence of all external interference easily during the not only complicated trouble of the assembling in the manufacture process, and use, is difficult to stablize the belt speed precision.

Concerning tape, for improve the information on tape record and from the tape playback information accuracy and the precision of stablizing the travelling speed of tape is very important; Say that clean equably for the tape to magnetic head slips face, the precision of stablizing belt speed also is very important and cleaning brought.

Based on above-mentioned situation, the purpose of this invention is to provide a kind of tape that is commonly referred to as micro cassette with said structure, this magnetic tape cassette assembles in manufacture process easily, and can stablize the precision of tape run location and travelling speed.

For realizing the previous purpose of the invention described above, according to magnetic tape cassette of the present invention, magnetic tape cassette with shell, a pair of wheel hub, tape and leaf spring, wherein, shell includes and is parallel to each other configuration and forms between the periphery of sidewall, sealing pair of sidewalls of a pair of wheel bore in opposite directions at interval perisporium and at a part of upper edge of perisporium perisporium bearing of trend mutually and 5 magnetic heads/pinch roller patchhole of row arrangement respectively; A pair of wheel hub is configured in the inner space of shell, and a pair of wheel bore separately of the pair of sidewalls of shell rotates the axial both ends of supporting wheel hub self freely; Tape is configured in the inner space of shell, and its two ends are fixed on a pair of wheel hub, and 5 magnetic heads/pinch roller patchhole along shell extends between a pair of wheel hub, is wound on selectively on the periphery of a pair of wheel hub; Leaf spring includes middle body and two end portions, middle body is positioned the magnetic head corresponding to the central part/pinch roller patchhole place of the inner space of shell, and be fixed on than between a pair of wheel hub along the more inner place of tape segment of 5 magnetic heads/pinch roller patchhole, the long side direction of two end portions from middle body along case peripheral wall extends and imposes elastic force towards the above-mentioned part of tape, and two end portions is provided with the tape pad on two positions corresponding to 2 magnetic heads/pinch roller patchhole of central magnetic head/pinch roller patchhole both sides; The two ends that it is characterized in that the two end portions of above-mentioned leaf spring extend to roughly the outermost position corresponding to largest interval distance on the above-mentioned a pair of wheel hub periphery separately.

When magnetic tape cassette is not contained in the tape operative installations as sound-track engraving apparatus, even between a pair of wheel hub along the tape segment that 5 magnetic heads/the pinch roller patchhole extends out of shell under the loose situation, the leaf spring of this structure also can stop above-mentioned slack to enter into the shell inboard too much.

In case above-mentioned slack enters into the inboard of shell too much, magnetic tape cassette is encased in the tape operative installations as sound-track engraving apparatus, when the operation of tape begins, bringing into operation of tape can be subjected to resistance, this has just hindered the stable of starting stage tape running speed precision, because it is thinner that the tape thickness of using in tape thickness used in the present invention and the accurate tape is compared, thus because above-mentioned drag effect is easier tape is produced damage, however the present invention can prevent the generation of this damage.

According to magnetic tape cassette of the present invention, in having the magnetic tape cassette of structure same as described above, being further characterized in that above-mentioned leaf spring has at savings under the state of the elastic force of energizing of prescribed level installs, when magnetic head was pressed against tape on the tape pad, the numerical value of the above-mentioned elastic force of energizing was 103 ± 34mN.

Because the elastic force of energizing of above-mentioned leaf spring is set at such numerical value, during the state of tape roof pressure, just prevented to make tape between magnetic head and tape pad, to produce the excessive frictional resistance of the stable accuracy of infringement tape running speed along 5 magnetic heads/pinch roller patchhole run duration of shell at magnetic head at the tape pad.But magnetic head can be brought into play high information record performance and good antifriction performance with the friction force contact tape of appropriateness concerning tape, can obtain to be unlikely overground appropriate cleaning performance concerning cleaning tape.In addition, at magnetic head during the state of tape roof pressure at the tape pad, make tape can also apply the friction force of appropriateness to tape by the tape pad along 5 magnetic heads/pinch roller patchhole run duration of shell between a pair of wheel hub, the result can stablize the precision of tape gait of march.

Also having a feature according to magnetic tape cassette of the present invention is in having the magnetic tape cassette identical with said structure, and the tape pad at the both ends of leaf spring is than more outside the giving prominence to of common tape row inbound path that extends out along 5 magnetic heads/pinch roller patchhole straight line between a pair of wheel hub.

The tape pad of this structure also can be at magnetic head during the state of tape roof pressure at the tape pad, make tape 5 magnetic heads/pinch roller patchhole run duration along shell between a pair of wheel hub apply appropriate friction force to tape, its result can stablize the precision of tape running speed.Further, under the situation of using tape, pinch roller is not pressed in tape under the state on the capstan, tape is wound up into F.F. on the side wheel hub that rotation drives or carrying out the process of falling soon from the opposite side wheel hub that freely rotates, make magnetic head contact tape and when tape reads the setting of F.F. selected songs (CDE) pattern of information or inquiry (REVIEW) pattern, magnetic head can gently be pressed in tape on the tape pad, and the result has increased the certainty of the information that reads from tape under F.F. selected songs or the query pattern.

Another feature according to magnetic tape cassette of the present invention is: in the magnetic tape cassette that has with aforementioned formation same structure, directly and the material of the parts of contact with tape select by following mode, that is: when on the either side wheel hub of tape at a pair of wheel hub during from opposite side wheel hub coiling tape, the take-up torque that is produced on an above-mentioned side wheel hub is a regulation numerical value.

Using under the occasion of tape, in order to realize that carrying out good information from tape resets and information is recorded on the tape, such selection is very important for the precision of stablizing the tape gait of march.

Direct and the contacted parts of tape include: shell, a pair of wheel hub, be arranged on the pair of sidewalls inside surface of shell and the contacted liner of two edge that extends and with length direction at tape, be arranged on guide finger or angle sheave that the tape between a pair of wheel hub of back side contact guidance of magnetic head surface of contact of the pair of sidewalls inside surface of shell and tape is advanced, backing material at the magnetic head surface of contact of tape is under the situation of mylar, shell and guide finger material separately is from polystyrene resin, acrylonitrile styrene resin, select in the acrylonitrile butadiene styrene resin, wheel hub and angle sheave material separately is a polyacetal resin, and liner is selected from following material: the super-high density polyethylene film, density polyethylene film with high, low density polyethylene films, poly tetrafluoroethylene, mylar, organic silicon coating film and organosilicon paper.

Another feature according to magnetic tape cassette of the present invention is: possess have the pair of sidewalls inside surface that is arranged on shell in the magnetic tape cassette of above-mentioned same structure and and the tape guide of advancing of the tape between a pair of wheel hub of back side contact guidance of the magnetic head surface of contact of tape: the perisporium of shell by from the periphery separately of pair of sidewalls mutually near and two parts of being in contact with one another constitute; At least be in position corresponding to the part of tape guide in the case peripheral wall near the periphery of the surface of contact either party's of above-mentioned two parts sidewall.

The shell of this structure is in manufacture process, when being contained in the fixing a pair of wheel hub of on arbitrary wheel hub, reeling tape simultaneously again in tape two ends in the outer casing space, if, be easy to a pair of wheel hub is installed in a pair of wheel bore of the side's sidewall with low height part through the little part of perisporium height.Like this, just become easy according to the assembling in the magnetic tape cassette manufacture process of the present invention.

Also have a feature to be according to cassette tape of the present invention: possess the pair of sidewalls inner surface that has rotation to be arranged on freely shell in the cassette tape of above-mentioned same structure and and the tape guidance wheel of advancing of the tape between a pair of wheel hub of back side contact guidance of the magnetic head contact-making surface of tape, this tape guidance wheel comprises: with the contacted main body cylindraceous in the back side of the magnetic head contact-making surface of tape with more protruding and contact and the flange in order to prevent that tape from coming off from the main body periphery of the two edges of the length direction of the contacted tape of periphery of main body than main body along radial direction at the two ends of main body. This flange be provided be positioned on the main body circumference and with the increasing of axial distance from above-mentioned periphery two ends along the dip plane that radial direction expands outwardly gradually; At first use flange and main body the mold of regulation to be shaped with resilient material simultaneously, axially release along above-mentioned from the mold of regulation then by injection molding process.

The tape guidance wheel that is provided with flange can prevent that tape from splitting away off from the main body periphery from axially going up of tape guidance wheel, thus can make the travel path of tape stable, and then can stablize the precision of tape gait of march in use.; the mould that the flange of tape guidance wheel and main body are stipulated with whippy material use is integratedly after the injection molded; along an above-mentioned axial direction when extrapolated; main body is retrodicted by the inner peripheral surface of the interior recess of the corresponding main body of mould and is made the diameter of this flange become identical with main body at the flange of the above-mentioned axial other end, so be not the regulation mould along radial direction separately but directly the angle sheave of injection molded is released from the mould of regulation.Therefore, the regulation mould of above-mentioned injection molded processing usefulness can make to become the structure that does not have the mould cut-off rule on the angle sheave periphery.So, can not produce the cut-off rule that forms by cutting apart mould on the main body periphery of the tape guidance wheel that is processed into this injection molded processing mold and the ledge surface, and correspondingly just be no longer necessary for the following process that reams cut-off rule and carry out.Certainly, the tape guidance of smooth surface wheel is contributed to some extent to the precision of stablizing tape running speed, also can not produce damage to the surface of thin tape.

Also has such feature according to magnetic tape cassette of the present invention: have in the magnetic tape cassette of structure same as described above, have rotation be arranged on freely shell the pair of sidewalls inside surface and and the tape guidance wheel of advancing of the tape between a pair of wheel hub of back side contact guidance of the magnetic head surface of contact of tape, this angle sheave comprises: with the contacted main body cylindraceous in the back side of the magnetic head surface of contact of tape with expand outwardly and contact the flange in order to prevent that tape from coming off from the main body periphery of the two edges of the tape that contacts with the main body periphery along radial direction at the two ends of main body.This flange be provided be positioned at the main body circumference and with away from direction of principal axis along the dip plane that radial direction expands outwardly gradually; The height that the flange of tape guidance wheel radially expands outwardly from the main body periphery is less than 0.15mm; The dip plane of flange is 30 ° to 45 ° from radial direction line angle of inclination; Flange and main body one are reinstated resilient material to release on axially above-mentioned after the mold injection molded of regulation from the mold of regulation.

Applicant's experimental result shows that it is best that the angle that the height that the flange of tape guidance wheel expands outwardly from the main body periphery along radial direction and the dip plane of flange tilt from radius is taken as above-mentioned numerical value.

Feature according to magnetic tape cassette of the present invention also is: have in the magnetic tape cassette identical with said structure, be provided with the back side contact that contacts with magnetic head and guide the tape guidance wheel of the tape operation between a pair of wheel hub to have to produce and overcome when angle sheave rotate and resistance that the static that produces between the shell causes and the free smoothly weight of rotating inertia force.

Stablize in request for utilization under the situation of tape of belt speed precision, the weight of tape guidance wheel also is very important.

That applicant's the best tape guidance of experimental result proof is taken turns heavily is 0.43mN to 0.7mN.

Also have according to the feature of magnetic tape cassette of the present invention: have structure same as described above and in the magnetic tape cassette that constitutes, set wheel bore along the size of the center line connecting direction of a pair of wheel bore separately of the pair of sidewalls of shell less than the size on the direction vertical with above-mentioned direction.

In the device that uses according to magnetic tape cassette of the present invention, the location of magnetic tape cassette is performed such, that is: with the perpendicular direction of the center line connecting direction of a pair of wheel bore on magnetic tape cassette is imposed elastic force, make it to touch the shell register pin.

Like this,, become not free, just can not damage freely rotating of a pair of wheel hub with regard to not making a pair of wheel bore that a pair of wheel hub is rotated to locate freely owing to the location of magnetic tape cassette if set a pair of wheel bore size separately as described above.And then can stablize the precision of tape travelling speed.

According to of the present invention another be characterised in that: have in the magnetic tape cassette that structure same as described above constitutes, the pair of sidewalls inside surface that is arranged on shell is arranged and and the tape guide of advancing of the tape between a pair of wheel hub of back side contact guidance of the magnetic head surface of contact of tape; This tape guide only is arranged on a certain side of the pair of sidewalls of shell, and is in the part between 5 magnetic heads/pinch roller patchhole on the shell and is in the other side that 5 magnetic heads/pinch roller two side portions only is arranged on the pair of sidewalls of shell.

If according to this configuration, when a pair of wheel hub of tape of reeling on the fixing some at least wheel hubs simultaneously in two ends in manufacture process is packed the inner space of shell into, at first a pair of wheel hub is contained in a pair of wheel bore of a sidewall that is provided with tape guide at first, and guide the operating path of the tape between a pair of wheel hub by tape guide, and then another sidewall covered, like this, the magnetic tape cassette of the present invention that tape is thin even physical dimension is little also can easily assemble in manufacturing process.

Feature according to magnetic tape cassette of the present invention also is: have in the magnetic tape cassette with the identical formation of said structure, further have 5 magnetic head/pinch rollers that are arranged in the enclosure space insert in the hole on the pairing position of some at least patchholes of 2 magnetic heads/pinch roller patchhole of outermost locations and between a pair of wheel hub along the tape segment of five magnetic heads/pinch roller patchhole when enclosure moves and the secondary tape pad of above-mentioned part sliding contact.

When handle is contained in the device that uses magnetic tape cassette according to magnetic tape cassette of the present invention, selectively erase head or signal are detected at least one patchhole of 2 magnetic heads/pinch roller patchhole that head or erasure, signal detect the outermost locations that 5 magnetic head/pinch rollers that the dual-purpose magnetic head is inserted into shell insert in the hole as required, so that contact tape, at this moment, if secondary tape pad is arranged, erase head or signal detect head or erasure, signal detects the dual-purpose magnetic head just can be stably with roughly definite friction force contact tape.As a result, not only can stablize the precision of tape running speed, and, using under the situation of tape, erasing has been recorded in the information on the tape and reads the signal that is recorded in the regulation on the tape and can both carry out really and stably all the time with various magnetic heads.In addition, under the situation of using cleaning tape, the face that can not slip the tape of above-mentioned various magnetic heads produces excessive wearing and tearing and can clean equably.

Describe various embodiment of the present invention in detail below in conjunction with accompanying drawing.

Fig. 1 is the planimetric map according to the magnetic tape cassette of the 1st embodiment of the present invention.

Fig. 2 is the right hand view of Fig. 1 magnetic tape cassette.

Fig. 3 is the front view of Fig. 1 magnetic tape cassette.

Fig. 4 is under the state that the upper half shell of the magnetic tape cassette of Fig. 1 is separated from lower half shell together with liner along the upper half shell inside surface of side wall, the planimetric map of representing from the upper half shell inside surface.

Fig. 5 is expression the upper half shell of the magnetic tape cassette of Fig. 1 along the upper half shell side wall inner surfaces together with liner from the lower half shell state that lower half shell is separated after getting off, the planimetric map of representing from the inside surface of lower half shell.

Fig. 6 is the liner that installs on the lower half shell among Fig. 5, leaf spring, a pair of wheel hub and after the tape of reeling selectively on a pair of wheel hub is all extractd under the state, the planimetric map of representing from the lower half shell inside surface.

Fig. 7 is the planimetric map of the leaf spring that a pair of tape pad is housed that separates from the shell of the magnetic tape cassette of Fig. 1.

Fig. 8 is the front view (FV) of the leaf spring of Fig. 7.

Fig. 9 is the assigned position that the magnetic tape cassette of Fig. 1 is contained in the device that uses tape, and said apparatus is in the planimetric map that stops under the operating state.

Figure 10 is contained in the magnetic tape cassette of Fig. 1 the assigned position of the device that uses tape, and under the state of the contact with tape in the pinch roller of said apparatus, recording/reproducing dual-purpose magnetic head and erase head and the magnetic tape cassette, cuts away the planimetric map of the part of magnetic tape cassette.

Figure 11 is the outboard profile of the tape guidance wheel that uses in the magnetic tape cassette of independent presentation graphs 1.

Figure 12 is the planimetric map of variation of flat shape of wheel bore of the magnetic tape cassette of presentation graphs 1.

Figure 13 is contained in the magnetic tape cassette of the 2nd embodiment of the present invention in the device that uses tape, and said apparatus is in the planimetric map that stops under the operating state.

Figure 14 is contained in the magnetic tape cassette of Figure 13 in the device that uses tape, and the pinch roller of this device, record/the put planimetric map under the contact with tape state in dual-purpose magnetic head and erase head and the magnetic tape cassette.

Fig. 1 to Fig. 3 is respectively according to the planimetric map of the 1st embodiment of the present invention, right hand view and front view (FV).Above-mentioned magnetic tape cassette is known so-called micro cassette, and its physical dimension is normalized.

From these figure as can be known, above-mentioned magnetic tape cassette has the shell 10 of the flat partially rectangular shape of a hollow, and shell 10 includes the configuration that is parallel to each other, and is formed with the pair of sidewalls 14a of a pair of wheel bore 12,12 separately, 14b; Pair of sidewalls 14a, the perisporium 16 that all intermarginal interval of 14b is closed; And as 5 magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d and the 18e of part bearing of trend and row arrangement along its length on the side (call this side in the following text and be antetheca, the opposing party is a rear wall) of 2 length direction extensions of perisporium 16 parts.

As Fig. 1 clearly represents, the a pair of wheel bore 12 of one side's sidewall 14a, 12 are in about middle position of the Width of sidewall 14a, and the distance that stipulate the space on the length direction of sidewall 14a, the size W that sets each hole width direction is bigger slightly than the size L of its length direction.More particularly, the formation of a pair of wheel bore 12,12 is that center relatively separately, each hole is a pair of semicircle 12a with radius of symmetry location in the both sides of above-mentioned Width, 12b, and a pair of semicircle 12a, 12b two ends are separately connected respectively by a pair of straight line 12c.

In this embodiment, the mutual spacing of a pair of straight line 12c and a pair of semicircle 12a, the diameter of 12b is identical, the 12a of a pair of semicircle, 12b continue a pair of semicircle 12a in two ends and the corresponding respectively termination of a pair of straight line 12c separately smoothly, 12b radius separately is 5.2mm to 5.5mm, the length separately of a pair of straight line 12c is 0.4mm, and above-mentioned size W is about 10.8mm, and above-mentioned size L is about 10.4mm.

As Fig. 2 and the special clearly expression of Fig. 3, the part at the above-mentioned rear wall of perisporium 16 and a pair of Width extension (calling You Bi and Zuo Bi in the following text) rear portion about 1/3rd separately separates in the about 1/2 place's level of above-below direction, and antetheca is separating near another sidewall 14b place level with right, about 2/3 part in left wall front side separately.The front end of the back horizontal cut-off rule 20b of about 1/3 part in rear end and rear portion of the preceding horizontal cut-off rule 20a of You Bi and left wall preceding 2/3 part separately is by coupling together towards the intermediate section secant 20c that front end extends along the top of retreading.These cut-off rules 20a number, 20b and 20c can be separated into shell 10 the upper half shell A of the first half that comprises side's sidewall 14a and perisporium 16 and comprise the opposing party's sidewall 14b and the lower half shell B of the Lower Half of perisporium 16.

, upper half shell A and lower half shell B screwed tight on four jiaos of 14b and combine at pair of sidewalls 14a with screw 22.

As the special clearly expression of Fig. 1, pair of sidewalls 14a, in each sidewall of 14b, middle position along near rear wall position rear wall forms cooperation cave 24, be formed with capstan patchhole 26 along near the middle position of antetheca antetheca in addition, with a pair of wheel bore 12,12 is the same, capstan patchhole 26 is at pair of sidewalls 14a, the size of (left and right directions of Fig. 1) is than pair of sidewalls 14a on the length direction of 14b, size on the Width of 14b (fore-and-aft direction of Fig. 1) is short, and is promptly so-called oval.

At pair of sidewalls 14a, form tape cassete pilot hole 28a near the 14b antetheca separately near the two ends at position on the position, 28b is in order to insert the tape cassete register pin of unshowned magnetic tape cassette operative installations as blattnerphone.Pair of sidewalls 14a, 14b a pair of pilot hole 28a and 28b shape separately separately is mutually different, as shown in Figure 1.That is: the side tape cassete pilot hole 28a of side's sidewall 14a constitutes so-called classic " key cave " shape, by the width quadrangle part identical with unshowned tape cassete register pin diameter and be in the bigger circular portion of the above-mentioned diameter of ratio that the front end of antetheca side forms continuously constitute on the quadrangle part.Opposite side tape cassete pilot hole 28b by the quadrangle part of the width identical with the circular portion diameter of above-mentioned pilot hole 28a and the circular portion of having of being on the quadrangle part that the front end of antetheca side forms continuously and four angle part width same diameter constitute.

Though not expression in Fig. 1 to Fig. 3, but comment from behind as Fig. 5 represent to extract upper half shell A lower half shell B state as can be known, the shape and size with reference to the described the opposing party's tape cassete of Fig. 1 pilot hole 28b of the shape and size of side's tape cassete pilot hole 28a of the opposing party's sidewall 14b and a side sidewall 14a are identical, and the shape and size of the opposing party's tape cassete pilot hole 28b of the opposing party's sidewall 14b are identical with shape and size with reference to above-mentioned side's tape cassete pilot hole 28a of side's sidewall 14a of Fig. 1.

In this embodiment, pair of sidewalls 14a, the a pair of wheel bore 12 separately of 14b, 12 spaces and a pair of wheel bore 12,12 and the tape cassete pilot hole 28a (situation of the sidewall 14a of upper half shell A shown in Figure 1) of classic " key cave " shape or the interval between the 28b (situation of the sidewall 14b shown in Figure 5 of lower half shell B) be defined as following size, that is: the mutual minimum distance of a pair of wheel bore 12,12 is 10.8mm ± 0.2mm; The maximum distance at above-mentioned interval is 31.6mm ± 0.2mm; Among classic " key cave " shape tape cassete pilot hole 28a or the 28b, from the rear end of its rear wall side to a pair of wheel bore 12,12 in separately the distance of antetheca side front end be 6.6mm ± 0.15mm; The rear wall rear flank end of classic " key cave " shape pilot hole 28a or 28b separately distance of rear end of rear wall side in a pair of wheel bore 12,12 is 17.4mm ± 0.15mm.

The pair of sidewalls 14a of shell 10, the outside surface separately of 14b is except a pair of wheel bore 12 of central authorities, 12, near the tape cassete pilot hole 28a of the position capstan patchhole 26 of near the cooperation cave 24 of the middle position at the position rear wall, middle position that antetheca closely is close to the position, the two ends, the left and right sides that antetheca closely is close to the position, all there is cosmetic sheet 30 to be covered with beyond the part between 28b and the wheel bore 12,12.Therefore, be that 22 decorated 30 on the screw of the upper half shell A of shell 10 and lower half shell B combination is hidden in Fig. 1.

On cosmetic sheet 30, be printed on and the relevant various information of tape cassete of pasting it.

Because the upper half shell A of shell 10 and lower half shell B all be respectively with transparent synthetic resin as: polystyrene (PS) resin, acrylonitrile styrene resin, acronitrile-butadiene-styrene (ABS) resin injection molding process, so at pair of sidewalls 14a, the part that does not cover on the outside surface separately of 14b between a pair of wheel hub 12,12 of cosmetic sheet 30 is used as from the view window 30a of visual observation shell 10 inside.

Consider that the upper half shell A that is processed to form with injection mo(u)lding is equal as far as possible with lower half shell B volume separately, will make that the pyrocondensation amount that upper half shell A and lower half shell B are produced after the injection mo(u)lding processing equates as far as possible, dimensional accuracy is separately done equally as far as possible.

The pair of sidewalls 14a of shell 10, the outside surface separately of 14b is except a pair of wheel hub 12 of central authorities, near the tape cassete pilot hole 28a of the position capstan patchhole 26 of near the cooperation cave 24 of the middle position at the position of 12 rear walls, the middle position that antetheca closely is close to the position, the two ends, the left and right sides that antetheca closely is close to the position, 28b and wheel bore 12, outside the part between 12, all use cosmetic sheet 30 to hide, on cosmetic sheet 30, be printed on the various information relevant with the magnetic tape cassette that is pasting it.

Because shell 10 be with lucite as: polystyrene (PS) resin, acrylonitrile styrene resin, acronitrile-butadiene-styrene (ABS) resin injection molding process, so at pair of sidewalls 14a, the part that does not cover on the outside surface separately of 14b between a pair of wheel hub 12,12 of cosmetic sheet 30 is used as from the viewport 30a of visual observation shell 10 inside.

In the inner space of shell 10, disposing a pair of wheel hub 32a, 32b, a pair of wheel hub 32a, 32b is rotated the pair of sidewalls 14a that is supported in shell 10 freely through the axial both ends of himself, in a pair of wheel bore 12,12 separately of 14b.In this embodiment, a pair of wheel hub 32a, 32b utilizes polyacetal resin to be processed to form by injection mo(u)lding.

The two ends of tape 34 are fixed on a pair of wheel hub 32a, on the 32b.Tape 34 is coated in magnetic on the substrate of mylar and makes together with cementing agent, below 13 μ m, usually, the thickness of 60 minutes recording tapes 34 is about 9 μ m to its thickness greatly, and the thickness of 90 minutes recording tapes 34 is approximately 6 μ m.

In the tape 34 at a pair of wheel hub 32a, the part of extending between the 32b is led by unshowned tape guide in the inner space of shell 10, and along 5 magnetic heads/pinch roller patchhole 18a of the antetheca of shell shown in Figure 3 10,18b, 18c, 18d and 18e extend out, and the remainder of tape 34 is wound on a pair of wheel hub 32a selectively, on the periphery of 32b.

In the inner space of shell 10, than a pair of wheel hub 32a that extends in the tape 34, the more inner place of part between the 32b also is provided with the leaf spring that extends along the above-mentioned part of tape, this leaf spring is by the perisporium 16 that is exposed at the shell 10 among Fig. 1 to Fig. 3 and 5 magnetic head/ pinch roller patchhole 18a, 18b, 18c, 18d, tape 34 outside the 18e is in covert and cannot see, but it includes middle body and two end portions, the position that middle body is fixed on the magnetic head/pinch roller patchhole 18c corresponding to middle position is than on the more inner position of the tape of this position, 34 above-mentioned part extends out two end portions from middle body along tape, and two end portions imposes elastic force towards the above-mentioned part of tape.

Show this leaf spring on Fig. 5 of the state of lower half shell B after expression separates upper half shell A, the back will be illustrated in detail.

As shown in Figure 3, both ends at leaf spring, 2 magnetic heads/pinch roller patchhole 18b corresponding to the both sides of central magnetic head/pinch roller patchhole 18c, be fixed with tape pad 36 on two positions of 18d, a pair of tape pad 36 is made it to contact on surface in the tape 34 by the two ends of leaf spring, and the outside pushing of tape 34 towards shell 10.

As shown in Figure 3, the part that stays between 5 magnetic head/pinch rollers on the antetheca of the perisporium 16 of shell 10 constitutes 4 pillar 38a, 38b, 38c and 38d.Four pillar 38a, 38b, 38c and 38d all closely are close to the position by the antetheca of periphery that near the position antetheca of the periphery of the sidewall 14a of the upper half shell A of shell 10 extends to the sidewall 14b of lower half shell B.

Four pillar 38a, 38b, 2 of both sides pillar 38a among 38c and the 38d, it is smooth that the prolonging of 38d end, and 2 pillar 38b of central authorities, the prolonging of 38c end-grain cutting and goes a part, and the antetheca of the periphery of the sidewall 14b of lower half shell B closely is close on the position and protrudes in these breach that cut out corresponding to being formed with little projection 40 on these gap positions that cut.

The tape 34 that the combination of such breach and kick 40 can prevent to approach is at a pair of wheel hub 12, take place between 12 when lax, through four pillar 38a, 38b, 38c, the gap that the antetheca of the periphery that prolongs the sidewall 14b that end and lower half shell B of 38d closely is close to the position skids off the outside.

As shown in Figure 2, inside surface separately at perisporium 16 left and right sides walls of the upper half shell A of shell 10, to the intermediate, inclined cut-off rule 20c, be formed with the projection 41 that tape is close to that prevents that many summaries extend perpendicular to above-mentioned inside surface from antetheca from the forwards horizontal cut-off rule 20a of the inside surface of sidewall 14a.

A pair of wheel hub 32a, the tape 34 between the 32b be from a pair of wheel hub 32a, and 32b is up to being formed with 5 magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, between the antetheca of 18e facing to the above-mentioned part of two walls about the perisporium 16 of upper half shell A.Therefore, when tape 34 at a pair of wheel hub 32a, the unshowned guides of sliding contact between the 32b and producing when guiding direct of travel under the situation of static, many tapes be close to prevent projection 41 just can prevent owing to this static make tape 34 be close to upper half shell A perisporium 16 about the phenomenon of two walls above-mentioned part separately, thereby prevented owing to this phenomenon of being close to hinders advancing of tape 34.

As shown in Figure 2, the rear wall of two walls closely is close to be formed with and holds the anti-error groove 42 of smearing pawl about the perisporium 16 of shell 10, but cannot see the anti-error pawl pockets 42 of smearing of left wall among Fig. 1 to Fig. 3, at the inside surface of the upper half shell A that separates from lower half shell B of expression and on Fig. 4 that the back will describe in detail and the inside surface of the lower half shell B that separates from upper half shell A of expression express simultaneously Fig. 5 that various parts that lower half shell B inside surface stays then will comment and can see this groove 42.

As shown in Figure 2, anti-error anti-error the smear pawl 44a of inside surface that smears the sidewall 14b that accommodates in the pawl pockets 42 at lower half shell B at right wall from giving prominence to corresponding to anti-error position of smearing pawl pockets 42, in addition as shown in Figure 4, the inside surface of smearing the sidewall 14a that accommodates in the pawl pockets 42 at upper half shell A at left wall anti-error is from corresponding to the anti-error outstanding anti-error pawl 44b that smears in position that smears pawl pockets 42.

Anti-errorly smear pawl 44a and 44b is well-known, will not illustrate at this.

Describe the inner structure of relevant shell 10 in detail below with reference to Fig. 4 to Fig. 6.Fig. 4 and content shown in Figure 5 are as described above, Fig. 6 has represented further to remove from the inside surface of the lower half shell B of Fig. 5 the appearance of the lower half shell B inside surface behind the above-mentioned remaining various parts, include liner 49 in the above-mentioned remaining various parts of representing among Fig. 5, have a pair of wheel hub 32a of tape 34,32b, have the leaf spring 50 of tape pad 36.

Shown in double dot dash line among Fig. 4, liner 52 is configured in the inside surface of the sidewall 14a of upper half shell A, liner 52 usefulness super-high density polyethylene films or density polyethylene film with high or low density polyethylene films or poly tetrafluoroethylene or mylar or organosilicon membrane or organosilicon paper are made, it and a pair of wheel hub 32a shown in Fig. 1, position in two edges of the length direction of the tape 34 of reeling selectively on the periphery of 32b is in the lengthwise edge sliding contact of inside surface one side of the sidewall 14a of upper half shell A, in the friction force that between reduction and this lengthwise edge, produces, also prevented the generation of static.

Liner 52 makes the central a pair of wheel bore 12 of the sidewall 14a that avoids upper half shell A, 12, rear wall closely is close to the capstan patchhole 26 of the cooperation cave 24 of the middle position at position, middle position that antetheca closely is close to the position, the tape cassete pilot hole 28a of position closely is close at the two ends that antetheca closely is close to the position, view window 30a between 28b, a pair of wheel bore 12,12 and the shape that on four jiaos of sidewall 14a inside surface, forms around the attachment screw pillar 56 of 2 cylindrical section shapes of attachment screw 54.

The two ends, the left and right sides of the trailing edge of liner 52 are formed with liner pilot hole 58a, 58b; When upper half shell A and lower half shell B were together with each other as shown in Figures 1 to 3, near the upper end of the liner reference column described later that forms the two ends, the left and right sides that the rear wall of the inside surface of the sidewall 14b of lower half shell B closely is close to just was inserted in liner pilot hole 58a, among the 58b.

The liner pilot hole 58a of one side is in the elongated slightly circle of left and right sides Xiang Cheng, and the liner pilot hole 58b of opposite side is circular.This is to cause the size predetermined allowance of above-mentioned liner reference column because considering the pyrocondensation after shell 10 injection mo(u)ldings are processed, and constitutes shape like this.

At the liner pilot hole 58a corresponding to liner 52, the position of 58b also is formed with the liner reference column of accepting the above-mentioned liner reference column of insertion upper end and accepts groove 60a, 60b on the inside surface of the sidewall 14a of upper half shell A.

The leading edge of liner 52 closely is close to 2 of two ends, the left and right sides of the position in conjunction with the rear of screw pillar 56 two pillar 38b to the inlet both sides of the magnetic head/pinch roller patchhole 18c of center from the antetheca of the inside surface of the sidewall 14a of upper half shell A, the dead astern of 38c is outstanding forward, while 2 pillar 38b, the part between the 38c caves in backwards.

The position of the forward wall of inside surface of the sidewall 14a of upper half shell A is corresponding to 5 magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, the part of the inlet of 18e is along with the multistage thickening of its thickness that extends back, thereby make not shown magnetic head and pinch roller to five magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, the insertion of 18e is easier, simultaneously, has prevented that also above-mentioned antetheca closely is close to position intensity and weakens.

The antetheca of the inside surface of the sidewall 14a of upper half shell A closely is close to the two ends, the left and right sides at position and closely is close to the tape cassete pilot hole 28a of position, 28b separately about the capstan of two edge and trailing edge and middle position insert 26 about two edge strengthen intensity with reinforcement 62.And then, also being formed with and the same crooked reinforcement that roughly is the U type 64 of the semicircle trailing edge of capstan patchhole 26 at the rear of capstan patchhole 26, the center about reinforcement 64 is formed with short transverse locator protrusions 64a.

Near near the two ends, the left and right sides at the position inside surface antetheca of the sidewall 14a of upper half shell A tape cassete pilot hole 28a, be formed with circular angle sheave above-below direction location convex 68 on the position of the 28b deflection left and right sides, closely be close at the antetheca of the inside surface of lower half shell B sidewall 14b on the position of position correspondence and also be formed with angle sheave above-below direction location convex 68, be used for locating position of rotating the above-below direction (short transverse) of the angle sheave of supporting freely by center of rotation described later.

Closely being close to the position at the antetheca of the inside surface of the sidewall 14a of upper half shell A also is formed with near outstanding liner roof pressure projection 70a 2 attachment screw pillars 56 in the place ahead, 70b.As shown in Figures 1 to 3, when upper half shell A and lower half shell B interconnect, liner roof pressure projection 70a, the jag support of 70b is contained in the left and right sides end positions of leading edge portion of the liner 49 of lower half shell side wall inner surfaces.Thus, when magnetic tape cassette lower half shell B is placed under the situation of top, prevented because the obstruction that tape is moved is caused from the sidewall 14b inside surface of lower half shell B is sagging in the two ends, the above-mentioned left and right sides at the leading edge position of liner 49.

The antetheca of the inside surface of upper half shell A sidewall 14a closely be close to the position also be formed with from the place ahead 2 in conjunction with the rear of screw pillar 56 near about the locating lug 71 of the tape above-below direction (short transverse) that inwardly stretches out of two walls.The edge of the length direction of one side of the sidewall 14a inside surface of the upper half shell A in the edge on 2 length directions of tape 34 is from a pair of wheel hub 32a, 32b is to forming 5 patchhole 18a, 18b, 18c, 18d, the antetheca of 18e and convex 71 sliding contacts of tape above-below direction location are so just define the above-below direction position of the tape 34 of sidewall 14a inside surface.

More than the various structures of the sidewall 14a inside surface of the upper half shell A of Xiang Shuing are except liner 52, all are to be processed by as hereinbefore material injection mo(u)lding.

Simultaneously the liner 49 of the sidewall 14b inside surface that is installed in lower half shell B shown in the double dot dash line of Fig. 6 is to use the material the same with the liner 52 of the sidewall 14a inside surface of upper half shell A to make shown in solid line among Fig. 5, it be wound on a pair of wheel hub 32a selectively, the edge of another length direction of inside surface one side that is positioned at the sidewall 14b of lower half shell B in the edge of two length directions of the tape 34 on the 32b periphery slips mutually, thereby the friction force that produces between itself and the lengthwise edge is descended, also prevented the generation of static simultaneously.

The shape that liner 49 is made can be avoided a pair of wheel bore 12 of the sidewall 14b central authorities of lower half shell B, 12, rear wall closely is close near the tape cassete pilot hole 28a of the position cooperation cave 24 of position middle position, capstan patchhole 26 that antetheca closely is close to the position middle position, the two ends, the left and right sides that antetheca closely is close to the position, view window 30a between 28b, a pair of wheel bore 12,12 and the columnar attachment screw column 72 that on four jiaos of sidewall 14b inside surface, forms.

The inlet of each the concentric screw hole 72a that forms on each attachment screw column 72 is by spot-facing, when upper half shell A and lower half shell B being together with each other like that as shown in Figure 1 to Figure 3, the central little cylinder of the 2 cylindrical section shape attachment screw pillars 56 of upper half shell A protrudes in this spot-facing, thereby has just determined upper and lower half shell mutual alignment relation in the horizontal direction.

Be formed with liner reference column 73 closely be close to the two ends, the left and right sides at position at the sidewall 14b of lower half shell B rear wall near, the two ends, the left and right sides of the trailing edge of liner 49 are formed with the liner pilot hole 74a that inserts liner reference column 73,74b, in addition, with reference to Fig. 4, the liner pilot hole 74b facing to the side of the elongated liner pilot hole 58a of the hinder marginal part of the liner 52 of aforementioned upper half shell A is elongated a little Long Circle, and the liner pilot hole 74a of opposite side is circular.This is owing to consider the cause of the dimensional tolerance of the liner reference column 73 that shell 10 injection mo(u)ldings processing back pyrocondensation causes.As upper half shell A and lower half shell B as shown in Figure 1 to Figure 3, when combining, the liner of hinder marginal part of liner 52 that is inserted into the sidewall 14a inside surface of upper half shell A in the upper end of liner reference column 73 is pilot hole 58a, in the time of 58b, also be inserted into the liner reference column that is formed on above-mentioned inside surface and accept groove 60a, among the 60b.

The leading edge of liner 49 closely is close to 2 rears in conjunction with screw pillar 72 at two ends, the left and right sides at position from the antetheca of the sidewall 14b inside surface of lower half shell B outstanding forward to the dead astern of 2 kicks 40 of the inlet both sides of the magnetic head/pinch roller patchhole 18c of center, and the part between 2 kicks 40 caves in backwards simultaneously.

The position of the forward wall of inside surface of the sidewall 14b of lower half shell B is corresponding to 5 magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, the part of the inlet of 18e is along with extending back, the multistage thickening of its thickness, thus make not shown magnetic head and pinch roller to five magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, the insertion of 18e is easier, has prevented that also above-mentioned antetheca closely is close to position intensity and weakens simultaneously.

The antetheca of the inside surface of the sidewall 14b of lower half shell B closely is close to the two ends, the left and right sides at position and closely is close to the tape cassete pilot hole 28a of position, 28b separately about two edge and trailing edge and middle position capstan patchhole 26 about two cause reinforcements 76 strengthen intensity, the rear of capstan patchhole 26 also is formed with and the semicircle trailing edge of capstan 26 reinforcement 78 of same crooked roughly take the shape of the letter U (being inverted U-shaped among Fig. 5), and the center, the left and right sides of reinforcement 78 is formed with the groove 78a in the short transverse location.

Be roughly the two ends of the reinforcement 78 of U font and be formed with leaf spring and support projection 78b, and extend leaf spring positioning bar 78c towards the periphery rear end of capstan patchhole 26 from being roughly the central authorities of the reinforcement 78 of U font.

On near the position antetheca of the inside surface of the sidewall 14b of lower half shell B, the tape cassete pilot hole 28a that closely is close to the position than left and right sides two ends, 28b is formed with angle sheave rotary middle spindle 80 on the position more to the left and right, and the tape guidance wheel 82 shown in double dot dash line rotates and is supported in freely on the angle sheave rotary middle spindle 80.In this embodiment and aforesaid a pair of wheel hub 32a, 32b is same, and tape guidance wheel 82 also is processed into the polyacetal resin injection mo(u)lding.

Around the base end part of angle sheave rotary middle spindle 80 by be used for positioning and guiding take turns 82 above-below directions (short transverse) position annular angle sheave above-below direction location convex 84 round.

Upper and lower half shell A as shown in Figure 1 to Figure 3, when B is together with each other, the antetheca that the antetheca of the inside surface of the sidewall 14a of upper half shell A closely is close to the sidewall 14b inside surface of the circular angle sheave above-below direction location convex 68 of left and right sides end positions at position and lower half shell B closely is close to the position of rotating the above-below direction (short transverse) that is supported in the angle sheave 82 on the angle sheave rotary middle spindle 80 freely in the inner space of the circular angle sheave above-below direction location convex 84 decision shells 10 around the base end part of angle sheave rotary middle spindle 80 of left and right sides end positions at position.

Closely be close to also to be formed with on the position at the antetheca of the inside surface of the sidewall 14b of lower half shell B and closely be close to outstanding liner roof pressure projection 86a from 2 attachment screw columns 72 in the place ahead, 86b, as shown in Figure 1 to Figure 3, on, lower half shell A, when B interconnects, liner roof pressure projection 86a, the jag supportive device of 86b is in the left and right sides end positions of the leading edge portion of the liner 52 of the sidewall 14a of upper half shell A inside surface, thus, when magnetic tape cassette the sidewall of upper half shell A is placed under the situation of top, prevented that the two ends, the above-mentioned left and right sides of leading edge portion of liner 52 are sagging and cause obstruction to tape 34 operation from the sidewall 14a inside surface of upper half shell A.

The antetheca of the inside surface of the sidewall 14b of lower half shell B closely be close to the position also be formed with from the place ahead 2 in conjunction with the rear of screw pillar 72 near about two walls inwardly open the locating lug 88 of the tape above-below direction (short transverse) that.The edge of the length direction of the sidewall 14b inside surface of the lower half shell B in the edge of 2 length directions of tape 34 is from a pair of wheel hub 32a, 32b is to forming 5 magnetic head/ pinch roller patchhole 18a, 18b, 18c, 18d, convex 88 sliding contacts of the antetheca of 18e and tape above-below direction location are so just define the position of above-below direction of the tape 34 of sidewall 14b inside surface.

Be formed with outstanding tape guidance pin 90 between in conjunction with screw column 72 and the tape above-below direction location convex 88 that closely is close to thereof in the enterprising step of each position that the antetheca of the inside surface of the sidewall 14b of lower half shell B closely is close to the left and right sides end positions at position.

The antetheca of the inside surface of the sidewall 14b of lower half shell B closely is close on the position corresponding to 5 magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, also be formed with 4 tape guidance pins 94 on four positions between the 18e, four imaginary straight line (double dot dash line of Fig. 5) 92 contacts that guide finger 94 is connected with the front end of the periphery of a pair of angle sheave 80 from the inboard, this imaginary straight line 92 be exactly usually tape between a pair of angle sheave 80 along 5 magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, the linear running path of 18e.

And each root of 4 guide fingers 94 of above-mentioned the former 2 guide fingers 90 and the latter all has when upper and lower half shell is assembled together (Fig. 1 is to shown in Figure 3) arrives the sidewall 14a inside surface of upper half shell A from the sidewall 14b inside surface of lower half shell B length (highly).Therefore, these guide fingers 90 and 94 height width greater than the tape that contacts with them.

The various structures of the inside surface of the sidewall 14b of the lower half shell B that more than described in detail, except that the leaf spring 50 and angle sheave 80 of liner 49, subsidiary tape pad 36, other parts all are to form with same material injection mo(u)lding processing with lower half shell B.

Fig. 7 is represented is the planimetric map of the leaf spring that is equipped with tape pad 36 50 taken off from lower half shell B, and Fig. 8 is the front view (FV) of the leaf spring that is equipped with tape pad 36 50 shown in Figure 7.

From these figure as can be known, leaf spring 50 has rearward recessed platform shape core 50a and divides the two end portions 50b of the two ends, the left and right sides of 50a to the extension of oblique the place ahead, 50c from central division.

As shown in Figure 8, the two edges up and down of core 50a are formed with detent 50d, two end portions 50b, the part separately of 50c is made of two thin middle band-like portions, thin outer end band-like portions and support extension, and wherein 2 thin middle band-like portions divide the upper and lower side position of each edge of the left and right edges of 50a to extend out in parallel to each other to oblique the place ahead from central division; Article one, thin outer end band-like portions extend to form the centre synthetic of the elongated end of 2 thin middle band-like portions at above-below direction more laterally; Support extension core 50a about extend the distance of lacking and form from the centre position of 2 thin middle band-like portions to oblique the place ahead on each edge of two edge.Support the extension rearward to carry out punch process and constitute leaf spring support projection 50e.

Tape pad 36 for example is fixed on two end portions 50b with fixing meanss such as cementing agents, 50c separately 2 thin middle band-like portions and the intersection of 1 thin outer end band-like portions.

In the assembling process of the magnetic tape cassette of this embodiment, at first shown in the double dot dash line of Fig. 6, utilize a pair of liner reference column 73 liner 49 to be arranged on the position of inside surface regulation of sidewall 14b of lower half shell B as previously mentioned earlier.

Then, as shown in Figure 5, leaf spring 50 is installed near the position of stipulating the antetheca of inside surface of sidewall 14b of lower half shell B, on the position of this regulation, the detent 50d of the lower edge of leaf spring 50 core 50a is stuck on the leaf spring positioning bar 78c at capstan patchhole 26 rears of sidewall 14b of lower half shell B.Two end portions 50b, the thin middle band-like portions of 2 of 50c support between the projection 78b that through 2 guide fingers 94 of central authorities and leaf spring both sides extend out to the left and right, and thin outer end band-like portions are engaged on corresponding 2 guide fingers 94 in the outside from the rear.

Be contained in the two end portions 50b of the leaf spring 50 on the assigned position, 50c overcomes the elastic force of self and scratches the state that is Fig. 7 double dot dash line in the wrong backwards from the free end position shown in Fig. 7 solid line, preload and bear, and among this embodiment, preloads greatly more than 19mN.

The both ends 50b of leaf spring 50, the leaf spring support projection 50e of 50c withstand on leaf spring and support convex 78b to go up to overcome above-mentioned preloading from the front side.

The both ends 50b of leaf spring 50, the thin outer end band-like portions separately of 50c are can be backward crooked to be positioned up to contact till the reinforcement 76 at two guide finger 94 rears in the outside.

Tape pad 36 on leaf spring 50 two end portions is configured in 2 magnetic heads/pinch roller patchhole 18b that is positioned at central magnetic head/pinch roller patchhole 18c both sides, among the 18d, and as shown in Figure 5, the imaginary line (double dot dash line among Fig. 5) 92 that the outstanding forward front end of crossing the periphery of a pair of angle sheave 80 connects, but the leading edge of not crossing the sidewall 14b of lower half shell B.

In the magnetic tape cassette assembling of this embodiment, next as shown in Figure 5, the two ends of tape 34 are fixed on a pair of wheel hub 32a, on the 32b, and tape 34 is wound on a side, this to wheel hub 32a, the side's of 32b axial end portion is inserted in a pair of wheel hub 12,12 of sidewall 14b of lower half shell B.At this moment, at first to be inserted into a square shaft of a side's who is wound with tape wheel hub (right-hand wheel hub 32b among Fig. 5) in an initial corresponding side's the wheel bore (the right-hand wheel bore 12 of Fig. 5) to end (below axial end portion among Fig. 5), and then again the tape 34 between the opposing party's wheel hub of not rolling up tape (Fig. 5 left wheel hub 32a) and the right-hand wheel hub 32b is pulled out, again as shown in Figure 5, the tape guidance pin 90 that this part tape closely is close to by the right-hand wheel hub 32b of the inside surface of the sidewall 14b of lower half shell B, antetheca closely is close to the angle sheave 82 of position right-hand member, antetheca closely is close to the right-hand member angle sheave 82 at position, after the order of the guide finger 90 that left wheel bore 12 closely is close to is drawn, the square shaft of the wheel hub 32a of left is inserted in corresponding the opposing party's wheel bore (left wheel bore 12 among Fig. 5) to end (below axial end portion among Fig. 5).

Closely be close at the antetheca of the inside surface of the sidewall 14b of lower half shell B between a pair of angle sheave 82,82 at two ends, the left and right sides at position, a pair of tape pad 36 of leaf spring 50 contacts this to tape 34 from the inside of tape 34.Therefore, as shown in Figure 5, this part above-mentioned tape 34 quilt roof pressure forward must surpass a pair of angle sheave 82, the imaginary line of representing with double dot dash line 92 (common linearity tape transport track) that the front end of 82 peripheries connects, but outwards outstanding leading edge of crossing the sidewall 14b inside surface of lower half shell B.

As can be seen from Figure 5, locate convex 88 to the tape 34 its tape guidance pin 90 that closely is close to from the tape above-below direction between them from the right-hand wheel hub 32b that is wound with most of tape and pass through, and the tape 34 between the tape guidance pin 90 that the left wheel hub 32a of the tape of never reeling closely is close to it passes through from the location of the tape above-below direction between them convex 88.That is: a pair of wheel hub 32a, tape 34 between each wheel hub of 32b and the tape above-below direction locating lug 88 that closely is close to separately all will pass through on tape above-below direction locating lug 88, and be wound on a pair of wheel hub 32a, it doesn't matter for the quantity of the tape 34 of reeling on the periphery separately of 32b.

Further the two ends of closely being close to the leaf spring of the position of position regulation installing 50 as the antetheca of Fig. 5 from the inside surface of the sidewall 14b of lower half shell B along the double dot dash line X that slightly extends perpendicular to the leading edge of sidewall 14b represented, the corresponding position that above-mentioned two ends are reached on the length direction of the sidewall 14b of lower half shell B faces by a pair of wheel bore 12, the a pair of wheel hub 32a of 12 location, the periphery separately of 32b.And the two ends of leaf spring 50 are preferably in the operation to tape 34 does not produce the scope of obstacle on the length direction of sidewall 14b of lower half shell B and extend to than a pair of wheel hub 32a, the position that 32b periphery separately is more outside.

When tape between a pair of angle sheave 82 along five magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, under the situation of the partial relaxation that 18e extends, the two end portions of the leaf spring 50 of Yan Shening has just prevented that the tape that relaxes from entering within the inside surface of sidewall 14b of lower half shell B side and going like this.In a single day tape 34 enters into inside like this, make tape at a pair of wheel hub 32a, and when advancing between the 32b, tape 34 hangs over the two ends of leaf spring will damage the tape stable operation of speed in accordance with regulations, also can damage the situation of tape.

Among this embodiment, corresponding to a pair of wheel hub 32a on the inside surface of the sidewall 14b of lower half shell B, draw on the periphery of 32b tape the position lower half shell B about have the intermediate, inclined cut-off rule 20c of clear expression on Fig. 2 on the position of two walls, so by the height of the above-mentioned left and right sides wall that limits than the horizontal cut-off rule 20a in intermediate, inclined cut-off rule 20c the place ahead more forward with regard to step-down, in Fig. 2 clearly expression.Its result, at a pair of wheel hub 32a, the operation that between the 32b aforesaid tape 34 volumes is hung on a pair of guide finger 90 and a pair of angle sheave 82,82 just becomes easily, that is: the assembling in the manufacture process of the magnetic tape cassette of present embodiment is just easily.

As shown in Figure 5, liner 49 is placed on the position of inside surface regulation of sidewall 14b of lower half shell B, and then, tape 34 is at a pair of wheel hub 32a, between the 32b along five magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, following a pair of wheel hub of state that 18e extends is installed in assigned position.Then, utilize the upper end of 2 liner reference columns 73 of the left and right sides that rear wall on the sidewall 14b inside surface of lower half shell B closely is close to the position liner 52 location of upper half shell A one side, and a pair of wheel hub 32a, the upper axial end of 32b cover.

Then, with 4 pillar 38a of upper half shell A antetheca, 38b, 38c, 38d pushes 5 magnetic heads/pinch roller patchhole 18a that closely is close to the position along the antetheca of the sidewall 14b of lower half shell B, 18b, 18c from oblique front upper place, 18d, the tape 34 that 18e extends covers upper half shell A on lower half shell B simultaneously.

Here, the central little cylinder of 4 jiaos 2 rank attachment screw pillar 56 cylindraceous on the sidewall 14a inside surface of upper half shell A is inserted in the spot-facing part of inlet of combined hole 72a of 4 jiaos attachment screw column 72 on the inside surface of sidewall 14b of lower half shell B, makes over against the relative position of the horizontal direction of the upper half shell A of lower half shell B and coincide.

In addition, because 6 guide fingers 90 of guiding tape 34 operations that contact with tape 34 inside surfaces, 94 and angle sheave 82, all be arranged on device with the leaf spring 50 of tape pad 36 in addition a pair of wheel hub 32a with tape 34 has been arranged, on the inside surface of the sidewall 14b of the lower half shell B of 32b, so above-mentioned upper half shell A is overlapped just can be a pair of wheel hub 32a before on the lower half shell B, tape 34 between the 32b is made the tape row inbound path that limits by above-mentioned various guide elementses in order on the side wall inner surfaces of lower half shell B, thereby assembling is facing to the upper half shell A of lower half shell B easily.That is to say, be easy to assembling in the manufacture process of the magnetic tape cassette of this embodiment.

After this, attachment screw 22 is inserted in four jiaos the screw insertion hole 54 of sidewall 14a of upper half shell A, is screwed in again among 4 jiaos the combined hole 72a of sidewall 14b of lower half shell B, thereby as shown in Figure 1 to Figure 3 upper and lower half shell is combined.Further cosmetic sheet 30 is attached to the sidewall 14a of upper half shell A and lower half shell B, the outside surface of 14b hides screw 22 get up.

Fig. 9 represents is the state of assigned position that the magnetic tape cassette as the 1st embodiment of the present invention of the structure of above commentary is contained in the device of the use magnetic tape cassette as the sound-track engraving apparatus.On this figure, in order to represent the inner structure of magnetic tape cassette, cutd open 5 magnetic heads of antetheca/pinch roller patchhole 18a of the sidewall 14a of upper half shell A, 18b, 18c, 18d, four pillar 38a between the 18e, 38b, 38c, the antetheca of the sidewall 14a of 38d and upper half shell A closely is close to 2 liner roof pressure projection 70a at position, and 70b represents with horizontal section.And, can see two liner roof pressure projection 70a, the jag of 70b is being supported the appearance of holding about the leading edge of the liner 49 on the inside surface of sidewall 14b of lower half shell B.

As shown in Figure 9, a pair of reel shaft 100a of said apparatus, 100b are inserted in the sidewall 14a of upper and lower half shell of the shell 10 of magnetic tape cassette on the afore mentioned rules position, and a pair of wheel hub 32a that exposes in the 14b a pair of wheel bore 12,12 separately is among the 32b; The capstan 102 of said apparatus inserts in the capstan patchhole 26 of central authorities that above-mentioned each antetheca closely is close to the position; The a pair of tape cassete register pin 104a of said apparatus, 140b inserts two ends, the left and right sides tape cassete pilot hole 28a that above-mentioned each antetheca closely is close to, among the 28b.On the position of afore mentioned rules, also the shell of magnetic tape cassette is imposed elastic force forward with the spring assembly of not shown leaf spring and so on.The result of making is the tape cassete pilot hole 28a the sidewall 14b of lower half shell B like this, and the trailing edge of 28b withstands on a pair of tape cassete register pin 104a, the tape cassete location division of the circle of the side face of 104b, thus define the position of the locational fore-and-aft direction of afore mentioned rules.Two edge contact with the periphery of corresponding tape cassete register pin 104b about the right-hand tape cassete pilot hole 28b of the sidewall 14b of lower half shell B, thereby define the locational left and right directions of afore mentioned rules position.

In addition, as previously mentioned, because a pair of wheel hub 12,12 and the size of the Width of leading axis hole 26 shell 10 separately greater than the size of length direction, so, be inserted into a pair of reel shaft 100a in these holes when even shell 10 is subjected to above-mentioned forward elastic force, 100b and capstan 102 can be a pair of wheel hub 32a yet, 32b and capstan 102 itself lean in the rear end in a pair of wheel bore 12,12 and leading hole 26, thereby have guaranteed their normal rotation.

As shown in Figure 9, the pinch roller 106 of said apparatus is facing to the magnetic head/pinch roller patchhole 18c that is contained in the magnetic tape cassette antetheca central authorities in the said apparatus; The record of said apparatus/the put magnetic head/pinch roller patchhole 18d of dual-purpose magnetic head 108 over against central magnetic head/pinch roller patchhole 18c right side; The erase head 110 of said apparatus faces the magnetic head/pinch roller patchhole 18e of right-hand member.

For the tape 34 in the shell 10 of magnetic tape cassette along 5 magnetic heads/ pinch roller patchhole 18a, 18b, 18c, 18d, 18e is at a pair of angle sheave 82, the part of extending between 82, since a pair of tape pad 36 of leaf spring 50 tape to sinciput, two the pillar 38b of central authorities between a pair of tape pad 36 of while, two pillar 38a in 38c and 36 liang of outsides of a pair of tape pad, 38d is tape roof pressure backward, so this part tape is wavy bending a little.

In addition, 4 pillar 38a that the inside surface antetheca of the sidewall 14a of upper half shell A closely is close to, 38b, 38c, the inside surface antetheca of the sidewall 14b of 38d and lower half shell B closely are close to the tape that constituted between four tape guidance pins 94 at position by tape 34 by using the gap.

Therefore, though a pair of tape pad 36 of leaf spring 50 the roof pressure forward of the tape between the angle sheave 82,82, but as long as not owing to a pair of wheel hub 32a, the tape 34 that makes between them that freely rotates of 32b relaxes, because four pillar 38a of upper half shell 14a antetheca, 38b, 38c, the antetheca of the sidewall 14b of 38d and lower half shell B closely is close to the interaction of four guide fingers 94 at position, and then tape 34 just can not pass through 5 magnetic head/ pinch roller patchhole 18a, 18b, 18c, 18d, 18e are projected into the outside.

Figure 10 represents is that said apparatus is set at the said apparatus under information record (REC) pattern situation and the state of above-mentioned magnetic tape cassette.At this moment, the pinch roller 106 of said apparatus, record/put three magnetic heads/pinch roller patchhole 18c that dual-purpose magnetic head 108 and erase head 110 are inserted into the antetheca correspondence of magnetic tape cassette, among 18d and the 18e, and, pinch roller 106 tape 34 is pressed on the periphery of capstan 102 and capstan is collaborative seizes tape 34 on both sides by the arms, record/put dual-purpose magnetic head 108 the tape roof pressure on the tape pad 36 of correspondence, tape 34 is held in 36 cooperations under the arm with the tape pad, and erase head 110 roof pressures are on tape 34.

Record/put dual-purpose magnetic head 108 the tape roof pressure on tape pad 36, make the leaf spring 50 right-hand ends overcome the elastic force of spring self from initial, set position shown in Figure 9 deflection backwards, at this moment can produce the elastic force of energizing of about 103mN ± 34mN, the above-mentioned elastic force of energizing is preferably in the scope of 69mN to 137mN, 1mN=10-3N.

When being set at the information logging mode, capstan 102 is along the speed rotation in accordance with regulations of the clockwise direction among Figure 10, and left side reel shaft 100a turns clockwise with the rotating speed faster speed than capstan 102, and the reel shaft 100b on right side is in the state that freely rotates.

On capstan 102 and the pinch roller 106 concerted actions wheel hub 32b periphery from the right side reel shaft 100b that freely rotates the speed of tape 34 with regulation is pulled out, be wound on from the tape 34 of discharging between capstan 102 and the pinch roller 106 on the periphery of the wheel hub 32a on the left side reel shaft 100a of speed rotation in accordance with regulations.Not shown free-wheeling mechanism in reel shaft 100a sponges the speed discrepancy between capstan 102 and the left side reel shaft 100a.

Concerning the tape 34 of speed operation in accordance with regulations as mentioned above, erase head 110 is at first erased the information and the noise that are recorded on the tape 34, then because device is set at recording mode, is used as the record of write head/put dual-purpose magnetic head 108 and supply is recorded/put on the magnetic recording face that the information of dual-purpose magnetic head 108 is recorded in tape 34.

Because the tape that dual-purpose magnetic head 108 was being recorded/put to the above-mentioned elastic force of energizing that the right part of leaf spring 50 produces to the tape roof pressure through tape pad 36 slips on the face, so can not produce excessive wearing and tearing to magnetic head 108, and can be recorded in information on the tape 34 equably all the time.

At this moment, the rotating speed official post of left side reel shaft 100a and capstan 102 is born the tension load that is referred to as to call backward pull from the tape 34 of the periphery of the wheel hub 32a to the reel shaft 100a of left side between capstan 102 and the pinch roller 106, so prevented tape 34 lax between above-mentioned.Therefore, tape between the guide finger 94 in pinch roller 106 left sides and the angle sheave 82 in left side overcomes that the left part of leaf spring 50 produces the above-mentioned elastic force and of energizing tape pad roof pressure backward, and tape 34 is moved in the position of roughly approaching the common linearity tape row inbound path shown in the double dot dash line 92 among Fig. 4.

When said apparatus is set in playback (PLAY) pattern, with the same pinch roller 106 under the situation of above-mentioned logging mode with record/put dual-purpose magnetic head 108 roof pressure tapes 34, and cooperate with capstan 102 and tape pad 36 and to seize tape 34 on both sides by the arms, and erase head 110 is in shown in Figure 9 and tape 34 discontiguous positions.Capstan 102 and a pair of reel shaft 100a, the situation of 100b action separately and above-mentioned logging mode is identical.

Record/put dual-purpose magnetic head 108 and be used as playback head, the information playback that has write down on the tape with above-mentioned fixing speed operation is come out.Because record/put dual-purpose magnetic head 108 and come the situation of usefulness identical as write head with above-mentioned, so, can not produce excessive wearing and tearing to magnetic head, and can from the record surface of tape 34, reset information come out equably all the time.

Can be set at F.F. (FF) pattern to said apparatus, when being in fast-forward mode, capstan 102, pinch roller 106, record/put magnetic head 108 and erase head 110 all is on the position shown in Figure 9, not with contact with tape.

Therefore, tape 34 is wound onto on the periphery of the wheel hub 32a on the left side reel shaft 100a that rotates with fixing speed along clockwise direction, and the wheel hub 32b from the right side tep reel 100b that freely rotates goes up to be come out by drawing.In this case, the diameter of the tape of rolling up on the wheel hub 32a periphery on the reel shaft 100a of left side 34 becomes big more, and the travelling speed of tape 34 is also just fast more.

Above-mentioned device can also be set at fast (REW) pattern of falling, and is the same with the situation of above-mentioned fast-forward mode when fast reverse mould formula, capstan 102, pinch roller 106, records/put dual-purpose magnetic head 108 and eraser 110 does not contact with tape 34.But opposite with the situation of above-mentioned fast-forward mode, left side reel shaft 100a is under the state that freely rotates, and right side reel shaft 100b counterclockwise rotates with the speed of regulation.

Therefore, opposite with the situation of above-mentioned fast-forward mode, tape 34 is wound onto and becomes on the periphery of counter clockwise direction with the wheel hub 32b on the right side reel shaft 100b of fixing speed rotation, and is drawn out from the wheel hub 32a that becomes on the left side reel shaft 100a that freely rotates.In this case, the diameter of the tape of reeling on the periphery of the wheel hub 32b on the reel shaft 100b of right side becomes big more, and the speed of travel of tape 34 is just fast more.

Above-mentioned device is when being set at some patterns of fast-forward mode and fast reverse mould formula, as the record of playback head/put dual-purpose magnetic head 108 and contact with tape, so just can on F.F. or the tape that falls soon 34, come out the information playback that is recorded on the tape 34.

The situation of playback information is referred to as F.F. selected songs (CUE) pattern under the fast-forward mode, and the situation of playback information is referred to as inquiry (REVIEW) pattern under the fast reverse mould formula.F.F. selected songs pattern or query pattern are used to for example retrieve the occasion that is recorded in the information on the tape.

Said apparatus is being set under the situation of F.F. selected songs or query pattern, is recording/put dual-purpose magnetic head 108 and be in the position shown in Figure 10 double dot dash line, just than littler under logging mode or the replay mode situation apart from roof pressure tape 34.

At this moment record/put the not inside roof pressure tape 34 of dual-purpose magnetic head 108 but corresponding as previously mentioned tape pad 36 outside roof pressure tapes 34, so, even under F.F. selected songs or query pattern, record/put the just light tape 34 of pressing of dual-purpose magnetic head 108, also can positively be close to the tape of recording/put dual-purpose magnetic head 108 to tape 34 and slip on the face.Therefore, in fact do not reduce the F.F. of tape 34 or fall speed soon, and can from the record surface of tape 34, reset information come out equably.

What represent on Figure 11 is the outboard profile that tape guidance wheel 82 has amplified.

Among this embodiment, the 82 usefulness polyacetal resin injection mo(u)ldings of tape guidance wheel are processed into, because the mould of this use in injection molding can not produce the mould cut-off rule on the angle sheave periphery of contact tape, so, there is not the mould cut-off rule corresponding to above-mentioned periphery position yet.Therefore, above-mentioned mould is made of main mould, the 1st secondary mould and the 2nd secondary mould, and main mould is formed with a shrinkage pool that limits angle sheave 82 periphery integral body, and the part that is equivalent to angle sheave 82 axial both ends of the surface has opening; The 1st secondary mould can combine with the openings that face toward an axial side of main mould along angle sheave 82 axial freedom discretely; And the 2nd secondary mould can with combine to the opening of opposite side facing to main mold shaft discretely along angle sheave 82 is axially free.The 2nd secondary mould has the center bar that inserts the above-mentioned open centre of main mould and limit the angle sheave center pit and opens above-mentioned opening and inject the resin that melting resin uses to above-mentioned shrinkage pool and penetrate the hole.

Tape guidance wheel 82 has volume and hangs the main body 82a cylindraceous of tape 34 and the bigger pair of flanges 82b of the radius than main body 82a of coaxial formation on the axial two ends of cylindrical body 82a, the axial length L R of the cylindrical body 82a width with tape 34 basically is identical, be approximately 4.2mm, the diameter DR of cylindrical body is 3.5mm ± 0.1mm, and the diameter DF of flange 82b is 3.7mm.Therefore, have between the radius of the radius of cylindrical body 82a and flange 82b that 0.1 ± 0.05mm's is poor.For usually thick be below the 13 μ m tape as: the tape that 60 minutes recording tape thickness are 9 μ m and 90 minutes with tape thickness be the tape 34 of 6 μ m, this difference can positively prevent tape from the periphery of cylindrical body 82a vertically above or below split away off.

As shown in figure 11, the side separately of the pair of flanges 82b of the main body 82a side of tape guidance wheel 82 is made of the scalene cone that the axial two ends from the periphery of main body 82a gradually far and gradually enlarge along radial direction.This scalene cone is set at 30 ° to 45 ° for the tilt angle alpha with the line (the radial direction line of main body 82a periphery) of the center line quadrature of main body 82a.

Because above-mentioned angle α is made to become above-mentioned value, after the injection mo(u)lding process finishing so, the 1st secondary mould and the 2nd secondary mould are separated, if a square shaft of the tape guidance that forms in the above-mentioned shrinkage pool of roof pressure master mould wheel 82 is to end face, tape guidance wheel 82 will be forced to eject from another opening of the above-mentioned shrinkage pool of the corresponding main mould of the opposing party's axial end of tape guidance wheel.At this moment, the part of periphery that limits the main body 82a of tape guidance wheel 82 in the main mould shrinkage pool is pushed the flange 82b of the axial end of angle sheave 82 1 sides towards above-mentioned discharge side and the crooked diameter that becomes above-mentioned part (that is: with the main body 82a of tape guidance wheel 82 the identical diameter of periphery) in the opposite direction, yet after tape guidance wheel 82 is discharged from main mould shrinkage pool, because the elastic force that himself has can revert to original shape to it fully.

Among this embodiment, a pair of tape guidance wheel 82 weight separately is set in the scope of 0.43mN to 0.70mN, and it is optimum to be set at 0.47mN.If the above-mentioned weight range of the weight ratio of tape guidance wheel 82 is excessive, the tape running resistance that contact with angle sheave becomes greatly, and produces excessive take-up torque, and this can hinder tape 34 smoothness runs.And, if the weight range of the weight ratio afore mentioned rules of angle sheave 82 kicks the beam, owing to and the angle sheave above-below direction locating lug 68 of the sidewall 14a inside surface of the angle sheave above-below direction locating lug 84 of the sidewall 14b inside surface of angle sheave central shaft 80, lower half shell B, upper half shell A between the static that produces of rubbing contact tape guidance wheel 82 is seriously influenced, and can not smoothly rotate, thereby also can hinder the smoothness run of tape 34.

In the above embodiments, a pair of wheel hub 12, each wheel bore can constitute as Fig. 1 is represented, that is: the symmetria bilateralis at shell 10 is provided with a pair of semicircle 12a with diameter, 12b, connect the two ends separately of a pair of semicircle respectively by pair of parallel straight line 12c, and a pair of semicircle 12a, get off smoothly continuously with the two ends of a pair of straight line 12c respectively in the two ends separately of 12b.Yet, a pair of wheel bore 12 ' also can be by the formation shown in Figure 12 solid line, that is: the length of a pair of straight line 12c ' that is parallel to each other is longer than the length of a pair of straight line 12c of the wheel bore 12 of Fig. 1 (among Figure 12 shown in the double dot dash line), the two ends of a pair of straight line 12c ' a pair of circular arc 12a ' of diameter greater than a pair of straight line 12c ' spacing, 12b ' couples together, thereby constitutes wheel bore 12 '.In this case, a pair of circular arc 12a ', being connected between the two ends separately of the two ends separately of 12b ' and a pair of straight line 12c ' is to have seamlessly transitted no longer just, but is identical at the wheel bore 12 ' of the wheel bore 12 of function aspects previous embodiment and above-mentioned variation.

Figure 13 is the planimetric map that the magnetic tape cassette according to the 2nd embodiment of the present invention is contained in the state of assigned position in the device of the use magnetic tape cassette of sound-track engraving apparatus and so on for example.Figure 14 is the planimetric map of the state of pinch roller, record/the put dual-purpose magnetic head of Figure 13 device magnetic tape cassette that contacts Figure 13 with erase head.

The structure of the magnetic tape cassette of the structure of the magnetic tape cassette of this embodiment most of and the 1st embodiment of the present invention that describes in detail referring to figs. 1 through Figure 11 is identical, and identical parts are marked with identical reference marks, has omitted detailed description.

The difference of the cassettes structure of the magnetic tape cassette of the 2nd embodiment and the 1st embodiment is that the antetheca that the guide finger 120 among the 2nd embodiment has replaced the sidewall 14b of lower half shell B in the 1st embodiment closely is close to the angle sheave 82 that the rotation of right part, position is being supported freely.

And, rolling up leaf spring 122 on the periphery of guide finger 120, the exterior region of the tape cassete pilot hole 28b of the cross-section above-mentioned right part of one end of this leaf spring 122 extends out, and is fixed with the tape pad 124 of tape 34 inner faces among the magnetic head/pinch roller patchhole 18e that leaves right-hand member slightly backward at the above-mentioned end of leaf spring 122.

As shown in figure 14, when erase head 110 roof pressure tapes 34, tape 34 just is crushed on the tape pad 124.That is: tape pad 124 and erase head 110 are seized tape 34 on both sides by the arms.

This seizing on both sides by the arms can make the tape of erase head 110 slip face contact tape with roughly certain friction force all the time, so not only can stablize the action of the erase head 110 that faces toward with tape 34, and can stablize the tape running speed of tape 34.

And as long as erase head 110 roof pressure tape not, tape pad 124 tape of just getting along well contacts, thereby can not produce unnecessary running resistance to tape.

The antetheca of the sidewall 14b that such tape pad 124 also can install at lower half shell B closely is close to the leading edge position of the tape cassete pilot hole 28a of left part, position, in this case, the antetheca that replaces the sidewall 14b of lower half shell B with guide finger closely is close to the left part at position and rotates the angle sheave of supporting freely 82, on this guide finger periphery, be wound with leaf spring, the exterior region of the tape cassete pilot hole 28a of the cross-section above-mentioned left part of one end extends out, be fixed with the tape pad on an end of this leaf spring, the inside of its tape 34 from left end magnetic head/pinch roller patchhole 18a is left a bit at interval slightly backward.

If the antetheca at the sidewall 14b of lower half shell B closely is close to the tape cassete pilot hole 28a at the two ends, the left and right sides at position, the exterior region of 28b all is provided with the tape pad, even the magnetic tape cassette turn-over, also can use with above-mentioned the samely.

State in the use in the device of magnetic tape cassette of the 2nd embodiment, use to record/put/smear the dual-purpose magnetic head and replace recording/put dual-purpose magnetic head 108.Detect special-purpose magnetic head with signal simultaneously and substitute eraser 110, like this, when being set at F.F. selected songs or query pattern, can only detecting special-purpose magnetic head to signal and contact with the tape 34 of high speed tape transport.

Tape in the magnetic tape cassette of above-mentioned in addition the 2nd embodiment also can make the cleaning tape that is coated with lapping powder or clean-out system on the magnetic head surface in contact of basal film.

Under the situation of magnetic tape cassette with the 2nd example structure as the cartridge tape that accommodates cleaning tape, the tape that erase head 110 or the signal that replaces it are detected magnetic head slips the surface and can not produce undue wear, and can be cleaned equably.

At last, the shell 10 of the part that conduct contacts with tape 34 among the aforementioned the 1st and the 2nd embodiment, tape guidance wheel 82, wheel hub 32a, 32b and liner 49,52 all is to make with the above-mentioned various materials of selecting, this just can be for stablizing the tape running speed of tape 34 accurately when tape 34 is advanced, and make tape reach necessary suitable take-up torque all the time.

The occurrence of this take-up torque is as follows:

(1) under the no load condition (recording/put the state that dual-purpose magnetic head 108 and erase head 110 do not contact tape), tape 34 is from a pair of wheel hub 32a, when a certain side of 32b is wound up into the opposing party, to a pair of wheel hub 32a, the torque total that 32b measures separately (i.e. two dishes torque) must be below 0.29mNm, a pair of wheel hub 32a, the torque (single-deck torque) that the folk prescription of 32b is measured must be less than 0.145mNm.

(2) have under the state (recording/put dual-purpose magnetic head 108 and the some at least states that contacts tape of eraser 110) of load, tape a pair of wheel hub 32a when a certain side of a pair of wheel hub is rolled onto the opposing party, the torque that 32b measures separately adds up to must be below 1.96mNm.

(3) special load condition (is recorded/is put dual-purpose magnetic head 108 and do not contact tape with erase head 110, and at the state that imposes the post-tensioning moment of 0.49mNm on the tape 34 of an above-mentioned side's wheel hub 32a or 32b (sending the wheel hub of side)) under, tape is when a certain side of a pair of wheel hub is rolled onto the opposing party, to a pair of wheel hub 32a, the torque that 32b measures separately adds up to must be below 2.94mNm.

Claims (1)

1. magnetic tape cassette, have shell, a pair of wheel hub, tape, leaf spring and tape guide, wherein shell includes the configuration that is parallel to each other and has respectively between the periphery of the pair of sidewalls of opposite wheel bore in opposite directions, sealing pair of sidewalls perisporium and at a part of upper edge of perisporium perisporium bearing of trend mutually and five magnetic heads/pinch roller patchhole of row arrangement at interval; A pair of wheel hub is configured in the inner space of shell, and a pair of wheel bore separately of shell pair of sidewalls rotates the axial both ends of supporting wheel hub self freely; Tape is configured in the inner space of shell, and its two ends are fixed on a pair of wheel hub, and five magnetic heads/pinch roller patchhole along shell extends between a pair of wheel hub, is wound on selectively on the periphery of a pair of wheel hub; Leaf spring includes middle body and two end portions, middle body is to be positioned at the inner space of shell corresponding to the magnetic head that is positioned at central part/pinch roller patchhole place, and be fixed on the capstan patchhole rear of shell between a pair of wheel hub, the long side direction of two end portions from middle body along case peripheral wall extends, and imposing elastic force towards the above-mentioned part of tape, two end portions is provided with the tape pad on two positions corresponding to two magnetic heads/pinch roller patchhole of central magnetic head/pinch roller patchhole both sides; Tape guide is arranged on the pair of sidewalls inside surface of shell and contacts with the back side of the magnetic head surface of contact of tape, is used for guiding the operation of the tape between a pair of wheel hub, it is characterized in that:

The perisporium of shell is made of the two parts approaching mutually and that be in contact with one another of periphery separately from pair of sidewalls; At least be positioned at a certain side's of surface of contact of approaching above-mentioned two parts sidewall peripheral position in the perisporium of shell corresponding to the part of tape guide.

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