CA1162175A

CA1162175A - Tape cassette

Info

Publication number: CA1162175A
Application number: CA000390528A
Authority: CA
Inventors: Hiroyuki Umeda
Original assignee: Victor Company of Japan Ltd
Current assignee: Victor Company of Japan Ltd
Priority date: 1980-11-25
Filing date: 1981-11-20
Publication date: 1984-02-14
Also published as: GB2089765B; NL184394B; CH646265A5; NL186729B; NL8105293A; IN155366B; NL8800399A; HK52185A; GB2089765A; NL186729C; NL184394C

Abstract

ABSTRACT OF THE DISCLOSURE
A tape cassette loaded with respect to a recording and/or reproducing apparatus having a reel driving mechanism including at least one reel driving shaft comprises a cassette case, and a supply side reel and a take-up side reel provided within the cassette case, for winding a tape. One reel of the supply side and take-up side reels is constructed so that the reel driving shaft of the recording and/or reproducing apparatus is inserted into this one reel from a lower direction thereof to engage therewith when the tape cassette is loaded into the recording and/or reproducing apparatus, and driven at a center part of the one reel. The other reel of the supply side and take-up side reels is constructed so as to be transmitted of rotation by a rotation transmitting mechanism at a part other than a center part thereof and rotated.

Description

1 ~6~17~

he present invention generally relates to tape casse-ttes, and more particularly to a tape cassette having a ~ construction such that one reel of a supply side reel and 1 a take-up side reel, for example, the supply side reel, is fitted over a reel driving shaft of a recording and/or reproducing apparatus and rotated at a center part thereof, and the other reel, for examp]e, the take-up side reel, is transmitted of rotat:ion at a part other than a center part ~0 thereof and rotated.
Presently, video signal recording and/or reproducing apparatuses using tape cassettes are reduced to practical use on the world-wide basis. As types of these recording and/or reproducing apparatuses using tape cassettes, two or three standardized types of apparatuses presently exist world-widely.
There is no interchangeability between apparatuses of different standards, however, interchangeability exists between apparatuses adopting the same standard. Accordingly, a tape cassette recorded by one recording and/or reproducing apparatus can be reproduced by another recording and/or reproducing apparatus of the same standard. Hence, in order to ensure in-terchangeability between different recording and/or reproducing apparatuses manufactured by different manufacturers ~ so as to perform recording and/or reproduction, a standardization ¦ is set with respect to formats of the tape cassette and the ¦ recording and/or reproducing apparatus. That is, the above ¦ formats are standardized for each standard, and a standard ¦ type tape cassette and a standard type recording and/or ¦ reproducing apparatus are respectively provided and employed ¦ for each standard.

I P62~7~
., ll I l Recently, a problem of much importance involves the realization in reducing the size of the recording and/or reproducing apparatus main body. This is to realize a more l compact portable type recording and/or reproducing apparatus, 1 and, for example, to realize such an equipment that a recording apparatus is unitarily built into a television camera.
In this regard, some attempts have been made to realize a compact type recording and/or reproducing apparatus l using a compact or miniature type tape cassette, which uses ¦ a tape pattern and format completely different from those of the standard type recordlng and/or reproducing apparatus using the standard type tape cassette which are already and widely accepted in the market. However, the above compact type ~ recording and/or reproducing apparatus attempted for ¦ realization uses a format completely different from that of ¦ the standard type recording and/or reproducing apparatus, and interchangeability does not exist therebetween. Therefore, in this compact type recording and/or reproducing apparatus, ~ there is a disadvantage in that a tape cassette recorded by ¦ the compact type recording and/or reproducing apparatus cannot ¦ be reproduced by the standard type recording and/or reproducing ¦ apparatus. This is a great inconveniellce and disadvantage to ¦ the owners of the compact type recording and/or reproducing ¦ apparatus.
l Another attempt has also been made to realize a ¦ compact type portable recording and/or reproducing apparatus ¦ which performs recording and/or reproduction with the same ¦ tape pattern and format as the standard type recording and/or ¦ reproducing apparatus, by using a tape cassette whose size ¦ is slightly reduced by reducing the tape quantity and the l 16217~
1.

I ~ diameter of the reels from those of the standard type tape cassette. In this system, a tape cassette recorded by the portable recording and/or reproducing apparatus can be ~ reproduced as it is by the standard type recording and~or 1 reproducing apparatus.
However, in the tape cassette used in the above portable recording and/or reproducing apparatus, the distance between a supply side reel and a take-up side reel is set equal l to the distance between the supply side and take-up side reels ¦ of the standard type tape cassette, so that the tape cassette used for the portable recording and/or reproducing apparatus can be loaded into the standard type recording and/or reproducing apparatus. Hence, even when the tape quantity is ~ reduced in order to reduce the diameter of the reels, there is ¦ a limit in reducing the diameter of these reels. Therefore, in this system, there was a disadvantage in that the size of the tape cassette as a whole could not be reduced significantly, and the same is true to the recording and/or reproducing ~ apparatus.
~ Furthermore, another system can be considered in ¦ which the tape quantity is reduced to reduce the diameter of ¦ the reels, and further, the miniature type tape cassette is ¦ constructed by reducing the distance between the supply side and ¦ take-up side reels. In this system, as a modification of the ¦ standard type recording and/or reproducing apparatus, the ¦ recording and/or reproducing apparatus can be constructed so ¦ that a reel disc for driving the take-up side reel is movable.
¦ In this modification of the standard type recording and/or ¦ reproducing apparatus, the take-up side reel disc is at a ¦ normal position when loaded with the standard type tape ~ 162~75 I cassette, and the take-up s~de reel disc is moved to a position closer to the supply side reel disc when loaded with the miniature type tape cassette.
E~owever, even in this system, for example, there is 1 a disadvantage in that the miniature type tape cassette recorded by the compact type recording and/or reproducing apparatus cannot be reproduced by the standard type recording and/or reproducing apparatus which is presently in wide use.
Moreover, there is a disadvantage in that it is extremely difficult to realize a mechanism for moving the reel disc in the manner described above. Fur-thermore, the recording and/or reproducing apparatus using the tape cassette generally has a mechanism for drawing out the tape from within the tape cassette to load the tape onto a predetermined tape path within the recording and/or reproducing apparatus. Therefore, it is also exceedingly difficult to construct the above mechanism for pulling out the tape, so that interchangeability exists with respect to the above compact or miniature -type tape cassette and the standard type tape cassette, and the realization of such a mechanism is virtually impossible.

SUMMARY OF THE INVENTION
¦ Accordingly, it is a ~eneral object of the present ¦ invention to provide a novel and useful miniature type tape 25 ¦ cassette in which the above described disadvantages have been ¦ overcome.
I ¦ Another and more specific object of the present invention is to provide a tape cassette constructed so that ~ one reel of a supply side reel and a take-up side reel is inser ed and engaged ~i~h a reel driving shaft of a recor~ing I lS21~5 I j and/or reproducing apparatus from a lower dire~tion thereof and rotationally driven at a center part thereof, and the other reel is transmitted of rotation at a part other than a ~ center part thereof and rotated. According to the tape cassette of the present invention, since the above other reel is rotated in a state transmitted of rotation at the part other than the center part thereof, and the construction is such that a reel driving shaft of the recording and/or ! reproducing apparatus is not inserted into and engaged with the ¦ center part of the above other wheel, the distance between centers of rotation in the supply side reel and the take-up ¦ side reel can be set to a relatively small value, and the ¦ size of the tape cassette as a whole can thus be reduced.
Moreover, while the tape cassette according to the present invention may be recorded and/or reproduced by a recording l and/or reproducing apparatus exclusively for this type of a i tape cassette, the tape cassette according to the present invention may also be recorded and/or reproduced by a l standard type recording and/or reproducing apparatus when the ~ tape cassette according to the present invention is accommodated within a tape cassette adapter having an external form and size substantially equal to a standard type tape cassette which is used with the widely used conventional standard type recording and/or reproducing apparatus.
Still another object of the present invention is to provide the above tape cassette constructed so that the above other reel rotates about a fixed shaft provided within a cassette case. According to the tape cassette of the present invention, the above other reel can rotate without play since the position of the above other reel is restricted l 162175 ,j 1l1 1 ~ by the fixed shaft, and the construction of the tape cassette can be simplified.
¦ Another object of the present invention is to ¦ provide a tape cassette wherein the above one reel is the ¦ supply side reel and the above other reel is the take-up ~ side reel. According to the tape cassette of the present ¦ invention, the rotational accuracy and the tape feeding ¦ accuracy are respectively high, since the supply side reel is ¦ driven by the reel driving shaft of the recording and/or ¦ reproducing apparatus. Furthermore, no inconveniences are 1 introduced by the indirect driving of the take-up side reel ¦ from the side of the cassette case, since there is no strict ¦ demand with respect to the rotational accuracy of the take-up 1 side reel.
l Other objects and further features of the present ¦ invention will be apparent from the following detailed description when read in conjunction with the accompanying drawi,ngs .

BRIEF DESCRIPTION OF THE DRAWINGS
__ _ FIGS.lA through lD respectively are a plan view, a side view, a bottom view, and a rear view, showing a ¦ miniature type tape cassette as an embodiment of a tape ¦ cassette according to the present invention;
¦ FIG.2 is a plan view showing the tape cassette 1 shown in FIG.lA in a state where the upper half of the tape ¦ cassette is removed;
¦ FIG.3 is a perspective view showing a cross section ¦ of the tape cassette along a line III-III in FIG.lA;
¦ FIGS.4A and 4B are cross-sectional views respectively ~ 162~75 ,1~
1 I showing a connection part hetween a supporting shaft of a take-up side reel and a lower half of the tape cassette, in a disassembled state, along lines IVA-IVA and IVB-IVB in FIG.2;
~ FIG.5 is an enlarged view showing a braking ¦ mechanism part of the take-up side reel shown in FIG.2;
FIG.6 is a perspective view, in cross section, showing the braking mechanism shown i.n FIG.5 along a line VI-VI;
l FIGS.7 and 8 are a plan view and a bottom view ¦ respectively showing a lower half of an embodiment of a tape cassette adapter whlch is loaded with the tape cassette ¦ shown in FIG.lA;
¦ FIG.9 is a plan view showing a state where the ~ tape cassette shown in FIGS.lA through lD is loaded into ~ the lower half of the tape cassette adapter shown ¦ in FIG.7, and the tape is drawn out from the tape cassette to form a predetermined tape path;
FIG.10 is a plan view showing the tape cassette ~ adapter in a state where an upper half if assembled to the ¦ lower half of the tape cassette adapter which is in the state shown in FIG.9, to accommodate the tape cassette;
FIG.ll is a cross-sectional view, with the tape cassette omitted, showing the tape cassette adapter ~ along a line XI-XI in FIG.10;
¦ E`IG.12 is a plan view showing an example of a compact type recording and/or reproducing apparatus exclusively for the miniature type tape casse-tte which operates together ¦ with the tape cassette shown in FIG.lA, in a state where the ¦ compact type recording and/or reproducing apparatus is in ¦ a recording or reproducing mode;

l 1~2~75 Il 1 ~ FIG.13 is a plan view showing an example of a standard type recording and/or reproducing apparatus which operates together with the tape cassette adapter loaded with ¦ the tape cassette shown in FIG.10, in a state where the ¦ standard type recording and/or reproducing apparatus is in ¦ a recording or reproduciny mode;
FIG.14 is a plan view showing another embodiment of a tape cassette according to the present invention in a ¦ state where an upper half thereof is disassembled;
¦ FIG.15 is a cross-sectional diagram along a line ¦ XV-XV in FIG.14;
¦ FIGS.16 an 17 are a side view and a bottom view ¦ respectively showing the -tape cassette shown in FIG.14;
¦ FIG.18 is a plan view showing a lower half of an ¦ embodiment of a tape cassette adapter wherei.n the tape ¦ cassette shown in FIG.14 is accommodated; and ¦ FIG.l9 is a plan view showing a state where the ¦ tape cassette shown in FIG.14 is accommodated within the ¦ lower half shown in FIG.18.

D~TAILED DESCRIPTION
_ __ A miniature type tape cassette 10 according to the present invention has a configuration shown in FIGS.lA
through lD, 2, and 3. The tape cassette 10 comprises a ¦ cassette case 11 having a size smaller than a standard type ¦ tape cassette which is loaded into a standard type video ¦ signal recording and/or reproducing apparatus. A lid 13 is ¦ provided on the frollt surface of the cassette case 11 in a ~ manner such that the lid 13 can freely open and close, to ¦ protect a magnetic tape 12 accommodated within the tape 1 ~ cassette 10.
¦ The c~assette case 11 consists of an upper half 14 and a lower half 15. The lid 13 is moulded from a resin such as polypropylene, for example, and is mounted to the upper half 14. A front lid portion 16 of the lid 13 can rotate ¦ about a hinge portion 17 provided at the thinly moulded corner ¦ part of the lid 13. The above front lid portion 16 is urged by ¦ a leaf spring 18 towards a lid closing direction, to cover the ¦ front surface of the cassette case 11. When the tape cassette ¦ 10 is not loaded into a tape cassette adapter and a video ¦ signal recording and/or reproducing apparatus exclusively for ¦ the tape cassette 10 (description on these adapter and ¦ apparatus will be given hereinafter), the front lid portion ¦ 16 covers the front surface of the cassette case 11 to protect ¦ the magnetic tape 12 exposed with respect to this surface.
¦ Furthermore, a finger 19 formed on the Eront lid portion 16 ¦ engages with an opening 20 of the lower half 15, and the front ¦ lid portion 16 is thus locked in a closed state.
In addition, as shown in FIGS.2 and 3, a supply side reel tsupply reel) 21 and a take-up side reel (take-up reel) 22 are provided in a parallel manner inside the cassette case 11. A distance D between respective centers of the supply and take-up reels 21 and 22, is shorter than the distance between centers of the supply and take-up reels of the standard type tape cassette used in the standard type recording and/or reproducing apparatus. With respect to the supply reel ¦ 21, the magnetic tape 12 is wound around a reel hub 25 ¦ between upper and lower flanges 23 and 24. Similarly, with ¦ respect to the take-up reel 22, the magnetic tape 12 is ¦ wound around a reel llub 28 between upper and lower flanges 1 162t7~

1 j 26 and 27. The magnetic tape 12 is pulled out from the supply reel 21 and guided by guide poles 29 and 30 respectively provided on the left and right end sides along the ~ front surface side of the cassette case 11, to form a tape path ~ 12A reaching the take-up reel 22.
The supply reel 21 is provided in a state where a projecting step portion 24a of the lower flange 24 is loosely fitted into a hole 31 having a large diameter of the lower ¦ half 15. Moreover, teeth 24b are formed in a ring shape on ¦ the lower surface of the lower flange 24 around the entire ¦ circular periphery thereof. Teeth 32 are formed in a ring ~ shape on the upper surface of the lower half 15, at positions ¦ opposing the above teeth 24b. The supply reel 21 is urged ~ towards the side of the lower half 15, by one arm portion 33a ¦ of a leaf spring 33 mounted on the lower surface of an upper ¦ plate of the upper half 14. Accordingly, in a no--mal state, ¦ the teeth 24b mesh with the teeth 32. Ilence, the supply reel ¦ 21 is controlled and prevented from rotating, due to the above ~ meshing of the teeth 24a and 32. Thus, the supply reel 21 does not unnecessarily rotate while the tape cassette lO is ¦ manipulated or in transit. Therefore, the magnetic tape 12 ¦ is prevented from being tangled and damaged, since slack is ¦ not introduced in the magnetic tape 12 which is wound around ~ the supply reel 21, and the magnetic tape 12 is prevented from ¦ being pulled unnecessarily out from the supply reel 21.
¦ A reel driving shaft inserting part 25a is provided on the inner side of the reel hub 25 of the supply reel 21, into which a reel driving shaft of the recording and/or i reproducing apparatus is inserted. The inner diameter of the ~ above reel hub 25 is equal to the inner diameter of the reel 11~2175 1 ll hub of the supply reel in the standard type tape cassette.
¦ The reel shaft inserting part 25a i5 open on the side of the above hole 31.
l Furthermore, a depression 23a is formed at the center ¦ portion on the upper surface side of the upper flange 23 of the supply reel 21. A projection 23b is formed at the center of the above depression 23a. The one arm portion 33a of the ¦ leaf spring 33 pushes the above projection 23b -towards the ¦ downward direction, to urge the supply reel 21 towards the ¦ side of the lower half 15. As will be described hereinafter, the supply reel 21 is movable upwards and downwards upon ¦ loading of the tape cassette lO into the recording and/or j reproducing apparatus, and this slack of the supply reel ¦ 21 is relatively large. Ilowever, since the depression 23a ¦ is provided in the periphery of the projection 23b, the tip ¦ end of the arm portion 33a of the leaf spring 33 does not make ¦ contact with the upper flange 23 of the supply reel 21, when ¦ the supply reel 21 is moved upwards and downwards.
The take-up reel 22 is provided in a rotatable manner such that a fixed shaft 34 embeddedly provided on the ¦ lower half 15 is inserted into a center hole of the reel hub ¦ 28. A center projection 26a provided on the flat flange 26 is ¦ pushed by another arm portion 33b of the leaf spring 33 towards ¦ the downward direction, and the take-up reel 22 is urged ¦ towards the side of the lower half 15. Since the reel hub 28 ¦ is not inserted with a reel driving shaft, an outer diameter ¦ d2 of the reel hub 28 is smaller than an outer diameter dl of ¦ the reel hub 25 of the supply reel 21. By this feature in ¦ which the outer diameter d2 of the reel hub 28 is smaller than the outer diameter dl of the reel hub 25, the amount of `: I

1 162~75 1 magnetic tape 12 which can be accommodated within the tape cassette 10 becomes large as compared to the case where the outer diameters dl and d2 of the reel hubs 25 and 28 are the l same. Accordingly, although the size of the tape cassette lO
¦ is small, recording and reproduction can be performed for a ¦ relatively long period of time by use of the above tape ¦ cassette lO.
¦ The fixed shaft 34 is screwed onto the lower half ¦ 15 with a screw 36 into a threaded part 34b, in a state where a projection 35 provided on the lower half 15 is inserted into ¦ a groove 34a extending in the diametrical direction at the ¦ lower end part of the fixed shaft 34 as shown in FIGS.4A and ¦ 4B. The above groove 34a and the projection 35 act as a ¦ detent when the projection 35 is inserted into the groove ¦ 34a, upon mounting the fixed shaft 34 onto the lower half ¦ 15 by the screw 36. Hence, the screw 36 can be screwed ¦ securely into -the threaded part 34b, and the operation to fix the fixed shaft 34 OlltO the lower half 15 can be performed with a high operation efficiency. As will be described hereinafter, a rotational force of the take-up reel 22 acts on the fixed shaft 34 during recording and reproducing operations. However, the fixed shaft 34 does not rotate ¦ unnecessarily, due to the above described insertion of the ~ projection 35 into the groove 34a. Accordingly, the screw 36 ¦ does not become loose since the fixed shaft 34 does not rotate, ¦ and the fixed shaft 34 is maintained in the initial fixed ¦ state without introducing instability in the fixed shaft 34.
¦ Therefore, the take-up reel 22 is always maintained in a ¦ predetermined position and rotates in a stable manner. Hence, ~0 ¦ the ma~netic tape 12 can be smoothly taken up by the take-up l 162175 I reel 22 without ùamaging the magnetic tape 12, an~ the take-up reel 22 stably engages with a driving force transmitting mechanism as will be described hereinafter.
¦ Moreover, a gear part 27a is formed on the outer ¦ peripheral part of the lower flange 27 of the take-up reel 22.
As shown in FIGS.lB, lC, 2, and 3, a part of the gear part 27a is exposed through a cutout window 37 formed at a part between the side surface and the bottom surface of the lower half 15.
l The above cutout window 37 is of an arcuate shape on the ¦ bottom surface side of the lower half 15.
¦ Furthermore, with respect to the take-up reel 22, ¦ a braking mechanism shown in FIGS.5 and 6 is provided. A
¦ braking member 38 is supported by pins 39a and 39b on the ¦ lower half 15 which are inserted through a pair of holes ¦ provided in the braking member 38, in a freely slidable manner ¦ in the upward and downward directions. The above braking ¦ member 38 is urged downwards against the lower half by coil ¦ springs 40a and 40b fitted around the periphery of corresponding ¦ pins 39a and 39b in order to prevent the braking member 38 from ¦ slipping upwards. When the braking member 38 is urged by the coil springs 40a and 40b and is at a lowered position, a main I body portion 38a of the braking member 38 closes a longitudinal ¦ hole 45 provided on the lower half 15 for positioning purpose ¦ which will~be described hereinafter. Moreover, a finger portion ¦ 38b is at the same height position as the lower flange 27, and ¦ is inserted between adjacent teeth of the above gear part ¦ 27a. The take-up reel 22 is thus locked at that rotational ¦ position, and slack is not introduced in the magnetic tape ¦ 12 wound around the take-up reel 22. ~5Oreover, the outer peripheral part of the lower flange 27 where the gear part - ~ 16~175 27a is formed, is a step lower than the flange surface at the inner peripheral side thereof.
l The above braking memher 38 moves upwards as will ¦ be described hereinafter, and in this raised state, the finger ¦ portion 38b disengages from the gear part 27a, and the locking operation with respect to the take-up reel 22 is accordingly released. Since the braking member 38 operates by moving parallel to the axis of the take-up reel 22, the braking member l 38 does not hit against and damage the magnetic tape 12 ¦ wound around the take-up reel 22. Hence, the construction of the braking mechanism is simple. In addition, the above braking mechanism does not take up much space, and is convenient for reducing the size of the tape cassette 10. Furthermore, l since the braking mechanism including the braking member 38 is ~ placed at the corner part of the cassette case 11 without taking up additional space. This is advantageous also from this point of view in reducing the size of the tape cassette.
Opcnings 41 and 42 for accepting loading poles and ~ an opening for accepting a capstan, are respectively provided in ¦ the bottom of the tape cassette 10 on the side of the lid 13.
Moreover, a positioning hole 44 and the positioning longitudinal ¦ hole 45 are respectively provided in the bottom surface of the tape cassette 10, at left and right sides close to the rear ¦ side. These hole 44 and longitudinal hole 45 are respectively ¦ formed within depressions 46 and 47. In addition, depressions 48 and 49 are respectively formed in the bottom surface of the tape cassette 10 at the left and right sides on the side of the lid 13.
¦ Depression 50 and 51 are formed on the left and ¦right end sides of the tape casset-te 10 shown in FIG.lA, from 1 162~75 1 substantially center position to the rear surface part thereof ¦ along the depth direction of the tape cassette 10.
¦ Projections 52 and 53 of the lower half 15 is fitted ¦ into depressions (not shown) provided on the lower side of I the upper half 14 to position the upper and lower halves 14 and 15 of the tape cassette 10, and these upper and lower halves 14 and 15 are connected together by screws 54 and 55.
FIGS.7 through 11 respectively show a tape cassette l adapter 60 which is used in a case where the tape cassette lO
¦ having the above described construction is loaded into the standard type recording and/or reproducing apparatus.
¦ The tape cassette adapter 60 has an accommodating ¦ part 61 for accommodating the above tape cassette lO, and ¦ has an external form and size substantially equal to those ¦ of the standard type tape cassette.
l The above tape cassette adapter 60 consists of a ¦ lower half 62 and an upper half 63. The upper half 63 is ¦ fixed to the ]ower half 62 by screws after the tape cassette 10 ~ is accommodated within the accommodating part 61 of the lower ¦ half 62.
The above accommodating part 61 for accommodating ¦ the above tape cassette lO is formed as an opening at a ¦ predetermined position of the lower half 62. A rotation ~ transmitting mechanism 84 is provided at a position adjacent ¦ to the above accommodating part 61. When the lower half ¦ 62 is placed on top of the standard type tape cassette for ¦ comparison, the supply reel 21 of the tape cassette lO
¦ accommodated within the accommodating part 61 is arranged at ¦ a position corresponding to the position of the supply reel of ¦ the standard type tape cassette. In addition, a gear 1 16217~

1 ¦ structure 64 of the rotation trans~itting mechanism 84 is arranged at a position corresponding to the position of the take-up reel of the standard type tape cassette.
The accommodating part 61 consists of an opening 65 1 having a shape substantially identical to the shape of the ¦ tape cassette 10 shown in the plan view in FI~.lA, a wall I part 66 encircling three sides of the opening 65, and ¦ projections 67, 68, 69, and 70 extending within the opening ~ 65 at positions in the bottom of the lower half 62. These ¦ projections are for positioning the tape cassette 10 when ¦ accommodated. Pins 71 and 72 are respectively embeddedly ¦ provided in the above projecting parts 67 and 68, for ¦ positioning the tape cassette 10.
¦ The gear structure 64 is provided in a rotatab]e ¦ manner at a position opposing a hole 73 in the lower half ¦ 62, as shown in FIGS.8 and 11. A reel driving shaft inserting ¦ part 64a is provided at the inner part of the gear structure 64. Moreover, a gear part 64b is provided at the outer ~ periphery of the above gear structure 64. A gear 74 having a ¦ small diameter meshes with the ahove gear part 64b. This gear 74 is axially supported by a shaft 75 on the lower half 62, ¦ and a part of the gear 74 protrudes into the above accommodating part 61.
¦ Similarly as in the standard type tape cassette, ~ openings 76 and 77 for inserting loading poles, and an opening ¦ 78 for inserting the capstan, are respectively provided in ¦ the front surface side of the lower half 62.

¦ Furthermore, guide poles 80 and 81 are embeddedly ¦ provided at the end of the above opening 76 and at the end of ¦ the opening 78, respectively, in the lower half 62. Moreover, , 1 I a guide pole 82 is embeddedly provided in the lower hal~ 62, at a position opposing the guide pole 30. As will be described hereinafter, the guide poles 80 and 81 guide the ¦ magnetic tape 12 so that the magnetic tape 12 forms a tape 5 1l path 12B along the front surface of the tape cassette adapter 60.
As shown in FIG.10, the upper half 63 has an U-shaped cutout 85. Inwardly projecting parts 87 and 86 are respectively formed on the right and left sides at the 1 innermost part of the cutout 85.
¦ Next, description will be given to a case where ¦ the above tape cassette 10 is independently loaded into a ¦ recording and/or reproducing apparatus exclusively designed ~ for the tape cassette 10, of a type different from the ¦ standard type recording and/or reproducing apparatus, ¦such as a compact recording and/or reproducing apparatus of a type smaller than the standard type recording and/or reproducing apparatus, for example, by referring to FIG.12.
l FIG,12 shows a compact type recording and/or ¦ reproducing apparatus 100. The width and depth of this compact type recording and/or reproducing apparatus 100 are smaller than those of a standard type recording and/or reproducing apparatus 120 shown in FIG.13, and the size of the ~compact type recording and/or reproducing apparatus 100 as a whole is small.
A supply reel driving shaft 101 is provided at a cassette loading part of the above compact type recording and/or reproducing apparatus 100, however, a take-up reel driving shaft is not provided. When the tape cassette 10 is loaded into the compact type recording and/or reproducing 11~2175 1 apparatus 100, the supply reel 21 is fitted over the supply reel ariving shaft 101, in a positioned state where the hole 44 and the longitudinal hole 45 are fitted over pins 102 and ¦ 103. In addition, a loading pole 104 and a tension pole 105 ¦ relatively enter within the opening 41, while a loading pole ¦ 106 and a capstan 107 respectively and relatively enter into the opening 42.
In the above loaded state, the supply reel 21 is ¦ pushed upwards as shown in FIG.3. Hence, the teeth 24b disengages from the teeth 32, and the supply reel 21 becomes ¦ freely rotatable. Moreover, the braking member 38 is pushed upwards against the forces exerted by the springs 40a and ¦ 40b, by the pin 103 inserted into the longitudinal hole 45.
¦ The finger portion 38b rises and the level of the finger ¦ portion 38b becomes different from that of the gear part 27a, to ¦ disengage from the gear part 27a. Accordingly, the take-up reel 22 is also released from the locked state, and becomes freely rotatable.
¦ When the operational mode of the recording ~ and/or reproducing apparatus is set to a play mode, the above poles 104, 105, and 106 intercept and engage with the magnetic tape 12 to draw out the magnetic tape 12, and respectively move to positions indicated by solid lines in ~ FIG.12. Hence, the magnetic tape 12 is drawn out of the ¦ tape cassette 10, to make contact with a full-width erasing l head 108. The magnetic tape 12 further makes contact with ¦ a guide drum 109 provided with rotary video heads ¦ throughout a predetermined angular range, and also makes l contact with an audio control head 110. Thus, the magnetic tape 12 is loaded onto a predetermined tape ~ 162~75 1 travelling path. During recording and reproduction, the magnetic tape 12 is driven in a state pinched between the capstan 107 and a pinch roller 111. Moreover, a driving gear ~ 112 which is rotated by a reel driving motor (not shown) meshes ¦ with the gear part 27a of the take-up reel 22, and the take-up reel 22 is accordingly driven towards a tape take-up direction.
The full-width erasing head 108, the audio control ¦ head 110, and the guide drum 109 are constructed under the ¦ same standard as corresponding heads and guide drum of the ¦ standard type recording and/or reproducing apparatus which ¦ will be described hereinafter. Accordingly, a signal is ¦ recorded onto and reproduced from the magnetic tape 12 with ¦ a tape pattern and format identical to those obtained by ¦ the standard type recording and/or reproducing apparatus.
¦ ~ext, description will be given for a case where ¦ the above tape cassette 10 is used by loading the tape cassette 10 into the standard type recording and/or reproducing apparatus, by referring to FIG.13.
In this case, the tai?e cassette 10 is accommodated within the tape cassette adapter 60 to form the above described prcdetermined tape path within the tape cassette adapter 60. This tape cassette adapter 60 accommodating the tape cassette 10 is loaded into the recording and/or reproducing apparatus as in the case where the standard type tape cassette ¦ is loaded.
l In order to accommodate the tape cassette 10 within ¦ the tape cassette adapter 60, the front lid portion 16 of ¦ the tape cassette 10 is first opened as indicated by a two-dot l chain line in FIG.lB. Then, the magne-tic tape 12 is drawn out ~ from the tape cassette 10 by a predetermined length. In this I ~ 62175 1 state, the take-up reel 22 is in a locked state and does not rotate. However, the supply reel 21 is reluctantly movable when the teeth 24b ride over the teeth 32 against the force exerted ¦ by the leaf spring 33. Hence, the magnetic tape 12 is drawn 1 out from the supply reel 21. In a case where the supply reel ¦ 21 does not rotate smoothly, the magnetic tape 12 may be drawn out while pushing the supply reel 21 upwards by a finger to release the teeth engagement of the supply reel 21 with the teeth 32.
l In the above state, as shown in FIG.9, the tape I cassette 10 is accomrnodated within the accommodating part 61 in the lower half 62, and the magnetic tape 12 which is drawn ¦ out is threaded around the guide poles 80, 81, and 82 so as to be guided by these guide poles. Accordingly, the magnetic tape 12 is guided especially by these guide poles 80 and 81 ~ in particular as shown in FIG.9, and forms the tape path 12B
¦ traversing the front surface of the openings 76, 77, and 78, as in the case of the standard type tape cassette. Then, the ! upper half 63 is placed over the lower half 62 as sllown in ~ FIG.10, and these upper and lower halves 62 and 63 are connected to each other by screws 88 through 9]. Therefore, as shown in FIGS.10 and 11, the tape cassette adapter 60 accommodates the tape cassette 10 therein, in a state where the magnetic tape 12 is drawn out from the tape cassette 10 and guided I along the predetermined tape path 12B.
I Next, description will be given with respect to the operation of each parts, when the tape cassette 10 is accommodated wi1hin the tape cassette adapter 60.
The tape cassette 10 is placed from above and ~ accommodated within the accommodating part 61. In -this state, the deuressions 46 through 49 provided at the bottom of the ~ 162175 li 1 1 tape cassette 10 respectively make contact with the projections 67 through 70 of the lower half 62. The peripheral side walls of the tape cassette 10 oppose the wall part 66 of the lower half 62. Furthermore, the hole 44 and the longitudinal hole 1 45 provided on the lower half 15 of the tape cassette 10 relatively fit over the pins 71 and 72, to position the tape ¦ cassette 10 within the accommodating part 61. The pin 72 in particular relatively passes through the longitudinal hole 45 ~ as shown in FIG.6, to push the braking member 38 upwards ~ against the forces exerted by the coil springs 40a and 40b.
That is, the braking member 38 is pushed upwards along the ¦ axial direction of the take-up reel 22. Hence, similarly as ¦ in the case described above, the finger portion 38b of the ~ braking member 38 disengages from the gear part 27a towards ¦ the upward direction, to release the locked take-up reel 22.
¦ At the same time, the gear 74 relatively enters within the ¦ cutout window 37 from below, to mesh with the gear part 27a.
¦ The gear 74 may be constructed to undergo slight movement so ¦ that the gear 74 meshes with tlle gear part 27a without ¦ difficulty. The lid 13 makes contact with a rib part 83 formed ¦ along the openings 76 and 77 of the lower half 62, and is ¦ maintained in a state closing the openings.
The upper half 63 of the tape cassette adapter 60 is mounted to the lower half 62 in a state where the inwardly projecting parts 86 and 87 respectively engage with the depressions 50 and 51 provided on the upper surface of the tape cassette 10. Hence, the tape cassette 10 is pushed by the projections 67 through 70 of the lower half 62 and by the inwardly projections 86 and 87 of the upper half 63. The tape cassette 10 is thus positioned with respect to the ~ 162175 1 directi.on of the thickness thereof, so that the tape cassette 10 does not slip out from the accommodating part 610 Furthermore, the tape cassette 10 is accommoda-ted within the l accommodating part 61 in a state where the upper surface and ¦ bottom surface of the tape cassette 10 lie in substantially the same planes as the upper surface and bottom surface of the tape cassette adapter 60.
FIG.13 shows the standard type recording and/or ¦ reproducing apparatus 120. The above tape cassette 3dapter 60 accommodating the tape cassette 10 therein, is loaded into ¦ the standard type recording and/or reproducing apparatus 120 in a similar manner as in the case where the standard ¦ type tape cassette is loaded. That is, when the above tape cassette adapter 60 is loaded into the standard type recording and/or reproducing apparatus 120, a supply reel driving shaft 121 is inserted into the reel driving shaft inserting part 25a of the supply reel 21, and a take-up reel driving shaft 122 is inserted into the reel drivi.ng shaft inserting part 64a of the gear structure 64 within the tape cassette adapter 60. Furthermore, loading poles 123 and 124 and a capstan ¦ 125 respectively enter into the openings 76, 77, and 78 ¦ behind the tape path 12~ (refer to FIGS.7 and 9). In addition, ¦ in the above loaded state, as in the case of the compact type ¦ recording and/or reproducing apparatus 100, the supply reel ¦ 21 is pushed upwards as shown in FIG.3. Accordingly, the ¦ locking operation with respect to the supply reel 2] is released, and the supply reel 21 becomes freely rotatable.
~ As described above, the take-up reel 22 is released from the ¦ locked state and is already in a freely rotatable state, in the ¦ state where the tape cassette 10 is accommodated within the ~ ~62175 1 tape cassette adapter 60.
Upon a tape loading operation, the above loading poles 123 and 124 respectively intercept and engage with the l magnetic tape 12, then draw the magnetic tape 12 out of the 1 cassette as the loading poles 123 and :L24 move away from the openings 76 and 77, and reach positions indicated by solid ¦ lines in FIG.13. Accordingly, the magnetic tape 12 which is drawn outside the tape cassette adapter 60, makes contact with l a full-width erasing head 126, and makes contact with a guide ¦ drum 127 provided with rotary video heads throughout a ¦ predetermined angu].ar range. The magnetic tape 12 further ¦ makes contact wi-th an audio control head 128. Therefore, ¦ the above magnetic tape 12 loaded onto a predetermined tape ¦ travelling path.
¦ During recording and reproduction, the magnetic tape ¦ 12 is driven in a state pinched between a capstan 129 and a pinch roller 125. Moreover, the gear structure 64 wi.thin the tape cassette adapter 60 is rotated in the clockwise direction by the take~up reel driving shaft 122. This rotation of the ~0 ¦ gear structure 64 is transmitted to the take-up reel 22 ¦ through the gear 74, to drive the magnetic tape 12 towards a ¦ tape take-up direction. Accordingly, the magnetic tape 12 ¦ fed out by the capstan 129 is taken-up by the take-up reel ¦ 22. The magnetic tape 12 is guided by the guide poles 81 and ¦ 82 within the tape cassette adapter 60.
l In either case where the above tape cassette 10 is ¦ independently loaded into the compact type recording and/or I reproducing apparatus 100 or the tape cassette 10 is loaded ¦ into the standard type recording and/or reproducing apparatus ¦120 in a state accommodated within the tape cassette adapter ~1 1 1 60, the supply reel 21 fits over the supply reel driving shaft ¦ 101 (121) provided in the recording and/or reproducing ¦ apparatus, and the supply reel 21 is directly driven. E~ence, ¦ the rotational accuracy of the supply reel 21 becomes high, ¦ and a highly accurate tape feeding operation can be obtained.
¦ Moreover, since the diameter dl of the reel hub 25 in -the ¦ supply reel 21 is large, the difference between the maximum ¦ and minimum diameters of the roll of the wound-tape on the ¦ above supply reel 21 is relatively small. ~ccordingly, the ~ varying range of the rotational speed of the supply reel 21 ¦ from the start to the completion of recording and reproduction ¦ is small, and the tape running accuracy is improved.
On the other hand, with respect to the -take-up reel 22, the take-up reel 22 is not fitted over the take-up reel driving shaft in either case where the above tape cassette 10 is independently loaded into the compact type recording and/or reproducing apparatus 100 or the standard type recording and/or reproducing apparatus 120 in a state accommodated within the tape cassette adapter 60. Thus, to a given size of the cassette, an amount of tape to be accommodated can be increased, or the size of the cassette case 11 can be reduced to a given amount of tape. The above take-up reel 22 is indirectly driven from the side of the cassette case 11 through the gear structure 64 and the gear 74. EEowever, ¦ since there is no strict requirements in the rotational ¦ accuracy of the take-up reel 22, no drawbacks are introduced.
¦ Further, as the take~up reel 22 rotates without play around ¦ the fixed shaft 39, no extra space is required around the reel, ¦ and this helps to reduce the size of the tape cassette.

¦ When the tape cassette 10 is unloaded from the loading 1 1 part of the compact type recording and/or reproducing apparatus 100, the supply reel 21 and the braking member 38 respectively move downwards. Thus, the supply reel 21 and the take-up reel 22 are both automatically locked so as not to rotate. Moreover, when the tape cassette 10 is removed from the tape cassette adapter 60, after the tape cassette adapter 60 is unloaded ¦ from the loading part of the standard type recording and/or ¦ reproducing apparatus 120, the braking member 38 similarly moves ~ downwards to lock the take-up reel 22.
¦ Next, description will be given with respect to ¦ still another embodiment of a tape cassette, by referring ¦ to FIGS.14 through 17. In FIGS.14 through 17, those parts which are the same as those corresponding parts in FIGS.lB, lC, 2, and 3 are designated by like reference numerals, and their description will be omitted.
A tape cassette 140 is the same as the above described tape cassette 10 except for the construction in the periphery of a lower flange of a take-up reel 141.
A ]ower flange 142 of the take-up reel 141 has a flat surface from the inner periphery to the outermost periphery thereof, and is provided with a gear part 142a at the outer peripheral surface thereof. This gear part 142a engages with the braking member 38, to lock the take-up reel 141 so as not to rotate, as in the case of the above tape ¦ cassette 10.
¦ A gear part 142b is provided at the lower surface ¦ of the lower flange 142. A diameter d3 of this gear part ¦ 142b is smaller than the diameter of a lower flange 142, and is ¦ substantially equal to the diameter of the reel hub 28.
This diameter d3 is smaller than the diameter of the corresponding 1 ¦ gear part 27a in the tape cassette 10 shown in FIG.3, and for example, is set to a value which is approximately one-half the diameter of the above gear part 27a.
~ ~ gear 143 which is axially supported by a pin 144, ~ is provided on the lower half 15. This gear 143 is arranged and provided at a position on the lower side of the lower flange 142. One end side of the gear 143 meshes with the above ¦ gear part 142b while the other end side is exposed through ¦ the cutout window 37 in the lower half 15, with respect to ¦ one diametrical direction of the gear 143. The diameter of ¦ this gear 143 is substantially equal to the diame-ter of the ¦ above gear part 142b.
¦ The tape cassette 140 having the above described ¦ construction is accommodated within a tape cassette adapter ¦ having an inner cons-truction different from that of the tape ¦ cassette adapter shown in FIG.10. FIG.18 shows a lower half ¦ 150 of this tape cassette adapter. The lower half 150 is ¦ identical to the lower half 62 shown in FIG.7 except for a ¦ rotation transmitting mechanism 151. A gear structure 152 in ¦ the above rotation transmitting mechanism 151 has a reel ¦ inserting hole 152a into which the take-up reel driving shaEt ¦ is inserted, at the inner part thereof, and a gear part 152b ¦ formed at the peripheral surface thereof. A gear 153 is ~ axially supported by a pin 154 provided on the lower half, ¦ in a state where the gear 153 meshes with the above gear ¦ part 152b and the gear 74.
¦ The tape cassette 140 is accommodated within a tape ¦ cassette adapter in a similar manner as in the case of the ¦ above tape cassette 10. FIG.l9 shows a state where the tape cassette 140 is accommodated in the lower half 150 of the tape 1 1~217~

1 cassette adapter. The tape cassette 140 is positioned and accommodated within the tape cassette adapter in a state wherein the gear 143 meshes with the gear 74. As shown in FIG.13, the tape cassette adapter accommodating the tape ¦ cassette 140 therein, is loaded into the standard type ¦ recording and/or reproducing apparatus 120. During recording and reproducing modes, the gear structure 152 engages with ¦ the take-up reel shaft 122 (refer to FIG.ll) and rotates in I the clockwise direction.

¦ This rotation of the gear structure 152 is ¦ transmitted to the gear part 142b, by way of the gears 153, 74, ¦ and 143. Hence, the take-up reel 141 rotates in the clockwise ¦ direction, to take-up the magnetic tape 12 around the reel ¦ hub 28. I-Iere, the reel hub 28 must be rotated at a ¦ predetermined rotational speed, so that slack is not introduced in the magnetic tape 12 which is successively fed when the magnetic tape 12 is taken-up. On the other hand, since the diameter d2 of the reel hub 28 in the above take-up reel 141 is small, the value for the above predetermined rotationa~ speed becomes a high value. I-Iowever, in the ¦ present embodiment of the invention, the diameter d3 of the ¦ gear part 142b of the take-up reel ]41 is small. Accordingly, ¦ the small-diameter gears 153, 74, and 143 which are required I for rotating the take-up reel 141 at the above predetermined ~ rotational speed, need only he rotated at considerably low rotational speeds compared to the case of the first embodiment of the invention. Therefore, the rotation transmitting mechanism system can operate in a stable manner, and long I serviceable life of the system can be assured.
¦ Furthermore, since the diameter d3 of the gear 1~62175 ,1 1 part 142b of the take-up reel 141 is small, the take-up reel 141 can be rotated at a high rotational speed without subjecting the rotation transmi-tting mechanism system to an excessive ¦ load. Thus, the diame-ter of the reel hub 28 in the take-up 1 reel 141 can further be reduced, and the tape cassette 140 accordingly becomes capable of winding and accommodating a ¦ larger quantity of tape.
In addition, in relation to -the gear 143 provided ¦ within the tape cassette 140, the gear 153 is provided within ¦ the tape cassette adapter. Hence, -the take-up reel 141 rotates towards the same direction as the take-up reel shaft 122, and the take-up reel 141 winds the tape in a manner ¦ similar to that performed by the take-up reel of the standard ¦ type tape cassette. This is also true with respect to the ¦ above described tape cassette 10.
¦ In a case where the tape cassette 140 is loaded ¦ into the compact type recording and/or reproducing apparatus ¦ 100, the gear 143 meshes with the driving gear 112 of the ¦ compact type recording and/or reproducing apparatus 100.
¦ In this case, the driving gear 112 rotates towards a direction ¦ Opposite to that when the compact type recording and/or ¦ reproducing apparatus 100 is loaded with the tape cassette 10. However, the take-up reel 141 is rotated -towards the clockwise direction as in the case where the tape cassette adapter is used, through the gear 143.
In each of the above embodiments of the invention, instead of providing the gear part at the peripheral side surface of the lower flange 27 of the take-up reel 22 within the tape cassette 10, and providing a rotation transmitting pulley instead of the gear 143 in the tape cassette 140, a I

1 I n~bber roller may be used in the rotation transmitting i mechanism within the -tape cassette adapters according to the above first and second embodiments of the invention. In this ~ case, the rotation is transmitted to the take-up reel 22 within ~ the tape cassette 10, and to the rotation transmitting pulley within the tape cassette 140, by use of the friction introduced ¦ therebetween.
¦ Moreover, the gear part at the periphery of the lower ¦ flange of the take-up reel 22 in the tape cassette 10 ~ay be formed as a bevel gear part. In this case, a bevel gear provided on a horizontal shaft of the adapter 60 or the side ¦ of the apparatus, relatively enters through an opening on ¦ the bottom surface side of the tape cassette of the cutout ~ window 37 provided in the tape cassette 10. ~ccordingly, ¦ the bevel gear meshes with the above bevel gear part of the ¦ lower flange, in a state where the bevel gear crosses the ¦ lower flange 27 in a perpendicular manner.
¦ Further, the present invention is not limited to ¦ these embodiments, but various variations and modifications ¦ may be made without departing from the scope of the present ¦ invention.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A tape cassette loaded with respect to a recording and/or reproducing apparatus having a reel driving mechanism including at least one reel driving shaft, said tape cassette comprising: a cassette case; and a supply side reel and a take-up side reel provided within said cassette case, for winding a tape, one reel of said supply side and take-up side reels being con-structed so that the reel driving shaft of said recording and/or reproducing apparatus is inserted into said one reel from a lower direction thereof to engage therewith when said tape cassette is loaded into said recording and/or reproducing apparatus, and driven at a center part of said one reel, the other reel of said supply side and take-up side reels being constructed so as to be transmitted of rotation by a rotation transmitting mechanism at a part other than a center part thereof and rotated.

2. A tape cassette as claimed in claim 1, in which said other reel is transmitted of rotation at a periphery thereof.

3. A tape cassette as claimed in claim 1, in which said other reel is transmitted of rotation at a periphery thereof said periphery being located within said cassette case.

4. A tape cassette as claimed in claim 1, in which said other reel is constructed to rotate about a fixed shaft provided within said cassette case.

5. A tape cassette as claimed in claim 1, in which said one reel is the supply side reel, and said other reel is the take-up side reel.

6. A tape cassette as claimed in claim 1, in which said other reel consists of a hub and a flange respectively having diameters smaller than those of a hub and a flange of said one reel.

7. A tape cassette as claimed in claim 1, in which said other reel has a reel flange transmitted of rotation at an outer peripheral part thereof, and said cassette case has an opening at a part corresponding to said reel flange.

8. A tape cassette as claimed in claim 7 in which said reel flange has a gear part for transmission of rotation provided at an outer peripheral part thereof.

9. A tape cassette as claimed in claim 1 in which said other reel has an upper reel flange and a lower reel flange, and said lower reel flange is constructed so that rotation is transmitted at an outer peripheral part thereof.

10. A tape cassette as claimed in claim 1 further comprising a braking member making contact with a reel flange of said other reel, for braking rotation of said other reel, and urging means for urging said braking member downwards, and in which said braking member and said urging means are provided within said cassette case, and said braking member is displaced upwards to separate from a peripheral edge part of said reel flange to release the braking operation.

11. A tape cassette as claimed in claim 10 in which said reel flange of said other reel has a gear part transmitted of rotation provided at an outer peripheral part thereof, and said braking member performs a braking operation with respect to said other reel by meshing with aid gear part.

12. A tape cassette as claimed in claim 10 in which said cassette case is provided with a hole at a position on the lower surface thereof corresponding to said braking member, and said braking member is displaced upwards by a pin-shaped member inserted through said hole, against the urging force of said urging means to release the braking operation.

13. A tape cassette as claimed in claim 12 in which said recording and/or reproducing apparatus is an apparatus exclusively for said tape cassette and has a loading part wherein said tape cassette is loaded independently, said loading part is provided with said pin-shaped member, and said braking member is raised by said pin-shaped member relatively inserted from said hole of said cassette case when said tape cassette is loaded into said loading part.

14. A tape cassette as claimed in claim 12 in which said recording and/or reproducing apparatus is a standard type recording and/or reproducing apparatus loaded with a standard type tape cassette, said cassette case is smaller than said standard type tape cassette, said tape cassette is loaded into said standard type recording and/or reproducing apparatus in a state accommodated within a tape cassette adapter having an external form and size substantially similar to those of said standard type tape cassette, said tape cassette adapter is provided with said pin-shaped member at an accommodating part thereof, and said braking member is raised by said pin-shaped member relatively inserted from said hole of said cassette case when said tape cassette is accommodated within said accommodating part.

15. A tape cassette as claimed in claim 14 in which said accommodating part of said tape cassette adapter is further provided with another pin-shaped member to form a pair with said pin-shaped member, said cassette case is further provided with another hole provided at the lower surface thereof to form a pair with said hole, and said pair of pin-shaped members are inserted into said pair of holes to position said cassette case within said accommodating part when said cassette case is inserted into said accommodating part.

16. A tape cassette as claimed in claim 15 in which said accommodating part of said tape cassette adapter is further provided with projections or depressions for positioning said cassette case, and said cassette case is further provided with depressions or projections in conformance with said projections or depressions of said tape cassette adapter.

17. A tape cassette as claimed in claim 1 in which said one reel can be moved upwards and downwards and constructed so that said one reel is raised when inserted with said reel driving shaft, said tape cassette further comprises urging means for urging said one reel towards a downward direction, and said one reel is lowered by said urging means and restricted of rotation in a state where a bottom surface of a reel flange thereof makes contact with said cassette case.

18. A tape cassette as claimed in claim 17 in which both of said reels respectively have a projecting part at a center part on the upper surface thereof, said urging means consists of a leaf spring making contact with the center projecting parts of both of said reels at parts in the vicinity of both ends thereof to urge both of said reels towards the downward direction, and said one reel is provided with a depression at an outer periphery of the center projecting part thereof.

19. A tape cassette as claimed in claim 17 in which teeth are provided at the bottom surface of the reel flange in said one reel, said cassette case is provided with teeth for meshing with the teeth of said reel flange at a surface corresponding to said reel flange, and rotation of said reel flange is restricted by the mesh engagement of the teeth of the reel flange of said one reel urged in the downward direction by said urging means with the teeth of said cassette case.

20. A tape cassette as claimed in claim 4 in which said fixed shaft has a non-circular depression at the lower end thereof, said cassette case has a non-circular projection provided at a mounting part of said fixed shaft for fitting into and engaging with said non-circular depression, and said fixed shaft is fixed to said cassette case by a screw in a state where said non-circular depression is fitted over said non-circular projection.

21. A tape cassette as claimed in claim 1 further comprising a gear part having a diameter smaller than that of the reel flange of said other reel and rotating unitarily therewith, and a gear wheel provided within said cassette case and in mesh engagement with said gear part, said gear wheel being transmitted of rotation from outside of said cassette case.

22. A tape cassette as claimed in claim 21 in which diameters of said gear part and said gear wheel are respectively selected to substantially similar values.