JPH06342577A - Tape cassette - Google Patents

Abstract

PURPOSE:To eliminate an erroneous detection by forming plural wall parts on a lower half in the manner of providing them integrally with it at the forming time as the preventative measures for the erroneous detection against an elastic force of an information detecting pin to the upper side. CONSTITUTION:Plural openings 26,27,28 are provided at the bottom side of the lower half 13 of a cassette casing consisting of upper and lower halves 12,13 wherein a reel is housed. Standing wall parts 22,23 are formed integrally with a bottom wall part 40 of the lower half 13, and 1st projecting parts 23a1, 23a2 and 2nd projecting parts 23b1, 23b2 are integrally formed on the standing wall part 23 in the longitudinal direction. An inner wall 29 provided at the inner side of a side surface part 3a and an inner wall 30 provided at the inner side of a back surface part 3b are also integrally formed at the time forming the lower half 13, and an opening/closing member 50 for preventing the erroneous erase is mounting there. On the opening/closing member 50, a projecting part 51 projecting upward against the width direction, an abutting part 52 and a tip part 53 extending out to its tip are provided, then recessed parts 53a1, 53a2 for engaging with the 1st and 2nd projecting parts 23a1, 23a2 and 23b1, 23b2 are formed on the tip part 53, and the information detecting pin provided between the projecting part 51 and the abutting part 52 is inserted to an detection hole 27 and made to stop by abutting on the lower surface 25b of an upper side wall part 25a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette suitable for use in a video tape recorder (VTR).

[0002]

2. Description of the Related Art In recent years, the performance of magnetic tapes and the performance of magnetic heads have improved, and there has been a demand for VTRs with higher resolution and higher image quality, and VTRs that match those demands are emerging. . At this time, for example, a high-performance magnetic tape using metal, vapor deposition, barium ferrite, etc. is used in place of the standard magnetic tape using the iron oxide magnetic material used in the current home VTRs. Various image quality modes have been considered in which recording is performed at a carrier frequency sufficiently higher than the carrier frequency of the standard mode used in the current home VTR.

When the standard mode and the high image quality mode can be achieved by one VTR, the two have different recording formats and signal processing systems, so that the user selects the type of magnetic tape. With VT
A desired mode is recorded by switching the mode selector switch on the R side to a desired state.

However, when recording is attempted by using a standard cassette in which a standard magnetic tape is stored in the VTR of this type or a high performance cassette in which a high performance magnetic tape is stored, both of them have their cassette housings. Since they have almost the same shape, it is necessary to perform a mode switching operation on the device side by discriminating and discriminating one by one from a standard cassette containing a standard magnetic tape or a high performance cassette containing a high performance magnetic tape. For example, even if it is a standard cassette, an erroneous operation such as setting to a high image quality mode for recording is performed, and when reproducing this, as described above, since the recording formats are different, a desired reproduced image cannot be obtained. ,
It may be mistaken for a failure. In addition, at the time of recording, even a high-performance cassette may be recorded in the standard mode, so whether the high-quality cassette was recorded in the high-quality mode or the standard mode by simply looking at the high-performance cassette during reproduction. Without understanding, there is some confusion in the mode switching operation. Furthermore, there is a possibility that a high-performance cassette recorded in the high image quality mode may be reproduced in the standard mode, or a standard cassette recorded in the standard mode may be reproduced in the high image quality mode. It is something that cannot be played.

On the other hand, as the performance of the magnetic tape and the performance of the magnetic head are improved as described above, and a VTR capable of recording / reproducing at a higher resolution is emerging, a VTR capable of recording / reproducing at a higher resolution is available. It is said that the standard cassette that stores the standard magnetic tape recorded in the standard mode which is the first mode is referred to as upward compatibility and is mounted on the VTR capable of recording and reproducing the high quality mode which is the second mode and reproduced. In this case, the content recorded in the standard mode is directly reproduced as a normal reproduced image for the reason described below. However, when a high-performance cassette containing a high-performance tape recorded in the high-quality mode, which is the second mode, is mounted on a VTR capable of recording and reproducing in the standard mode, which is the first mode, and is reproduced. As described above, since the recording format and the signal processing system are different, the content recorded in the high image quality mode is structured not to be reproduced as a normal reproduced image. That is, in the case of the VTR capable of high-resolution recording and reproduction, in the latter case from the viewpoint of compatibility, the former recording format and signal processing are possible, and the image quality is further improved. This is because a recording format and a signal processing system that enable the above are adopted.

As a tape cassette that solves these problems, for example, a standard cassette A as shown in FIGS.
Is well known. That is, in this standard cassette A, the cassette housing 1 is composed of an upper half 2 and a lower half 3 which are vertically divided into two parts, which are provided with an opening on one side and are joined by screws or the like in a lid-fitting state. It is an integrated structure.

Reference numeral 4 denotes an opening / closing lid for closing the opening of the cassette housing 1. This is a lid which is always closed by a coil spring (not shown) when the standard cassette A is not attached to the apparatus. Contaminates the signal recording surface of the magnetic tape,
Protects against damage. At a predetermined position in the cassette housing 1, for example, as shown in Japanese Utility Model Publication No. 58-7510, a pair of supply reels 7 and a pair of supply reels 7 around which a magnetic tape is wound in a state of being attached to an opening. The take-up reels 8 are rotatably arranged at predetermined intervals. Further, a brake mechanism 10 including a brake release member 9 operated by a brake release pin (not shown) of the device and a pair of brake pieces 10a and 10b cooperating with the brake release member 9 is disposed between the reels 7 and 8. . This braking mechanism 10 prevents the tape reels 7 and 8 from unnecessarily rotating to loosen the magnetic tape when the standard cassette A is not mounted in the apparatus, and when the standard cassette A is mounted in the apparatus. Has a function of permitting the rotation of the tape reels 7 and 8.

Further, at a predetermined position on the back surface 5 of the cassette housing 1 of the standard cassette A, a concave portion and a cutout provided so as to close the concave portion are provided as in a known audio tape cassette. An erroneous erasure prevention detection unit 6 having claws and the like is provided. That is, when the standard cassette A is attached to the apparatus, the presence or absence of the claw of the erroneous erasure prevention detection unit 6 is detected by the detection means (not shown) provided on the VTR (apparatus) side. Then, for example, when the standard cassette A in which a signal is already recorded on the standard magnetic tape and the nail is cut off is attached to this apparatus, the detecting means of the apparatus detects this and the magnetic tape is detected. The erasure of a recorded signal is prevented so that a new signal is not recorded.

When a high-performance cassette containing a high-performance magnetic tape such as a metal tape is attached to a VTR for standard mode, the ferrite head provided in this VTR is saturated due to its composition. If the magnetic flux density is insufficient and signals cannot be recorded, and if a high-performance magnetic tape such as the above-mentioned metal tape is to be recorded using a sendust head, the high-performance magnetic tape causes wear to the head itself. The problem of coming up arises.

In order to solve such a problem, for example, the applicant of the present application has already proposed a high performance cassette B containing a high performance magnetic tape as shown in FIG.
I am applying for No. 249. This high performance cassette B
It has substantially the same configuration as the standard cassette A described above. That is, the cassette housing 11 of the high-performance cassette B is vertically
It is composed of an upper half 12 and a lower half 13 which are divided, and these are integrally formed by being joined with a screw or the like in a state where the lids are fitted together, and a rotatable opening / closing lid (not shown) is provided in the opening. Has been. On the back surface 14 of the cassette housing 11, a concave portion 15 having no claw is formed at a position substantially corresponding to the erroneous erasure prevention detecting portion 6 of the standard cassette A, and the standard portion is formed at a position substantially symmetrical to the concave portion 15. An erroneous erasure prevention detection unit (detected portion) 18 including a recess 16 having the same configuration as the erroneous erasure prevention detection unit 6 of the cassette A and a removable erasure prevention claw 17 provided so as to close the recess 16 is provided. Has been. Reference numeral 19 is a concave portion to which a label for displaying recorded contents is attached.

A high-performance cassette B in which, for example, a pair of reels around which a metal tape is wound is rotatably housed in the cassette housing 11 thus constructed is a dedicated machine for using this, that is, a second machine. When it is mounted on a VTR capable of recording and reproducing in a high image quality mode which is a mode, an erroneous erasure prevention claw detection means (not shown) of a dedicated machine is irrelevant to the erroneous erasure prevention detection unit regardless of the concave portion 15 provided on the back surface. The presence or absence of the claw 17 is appropriately detected, and for example, in the case of a high-performance recordable cassette having the claw 17, the apparatus can be in the recordable state and the signal can be recorded without any inconvenience.

On the contrary, the high-performance cassette B in which a signal is already recorded on the high-performance magnetic tape of the high-performance cassette B, the claw 17 is already cut off, and the recess 16 is exposed is described above. When it is mounted on the dedicated machine as described above, the detecting means of the apparatus does not detect it and enter the recording mode, and therefore the recorded signal on the tape is not erased by mistake.

On the other hand, when the high performance cassette B is mounted on a VTR capable of recording and reproducing in the standard mode,
As described above, since the concave portion 15 is already exposed at the position of the rear surface 14 on which the erroneous erasure prevention claw detection means of FIG. 1 operates, the erroneous erasure prevention claw detection means of the VTR capable of recording and reproducing in the standard mode described above. However, the recording mode in which the signal is detected and the signal is recorded on the tape cannot be obtained. Therefore,
Even if the outer shape of the high performance cassette B is the same as that of the standard cassette A, the high performance cassette B can be easily identified by being mounted on the VTR capable of recording and reproducing in the standard mode. The device does not malfunction due to the identification.

When the high performance cassette B is mounted on a VTR capable of recording and reproducing in the standard mode, the recess 1
5 is detected by the erroneous erasure prevention claw detection means of the VTR capable of recording / reproducing in the standard mode.
No signal is recorded by the ferrite head mounted on the TR, and therefore, for example, a VTR capable of recording / reproducing in this standard mode with a metal tape.
Problems such as abrasion of the head itself provided in the above are also eliminated.

[0015]

By the way, in the above-mentioned high performance cassette B, the rear surface 1 of the cassette housing 11 is used.
A concave portion 15 having no claw is formed at a position substantially corresponding to the erroneous erasure prevention detecting portion 6 of the standard cassette A in the concave portion 4 and
5, an erroneous erasure prevention having a concave portion 16 having the same structure as the erroneous erasure prevention detecting portion 6 of the standard cassette A and a releasable erroneous erasure prevention claw 17 provided so as to close the concave portion 16 at a position substantially symmetric to 5. A detection unit (detection unit) 18 is provided. That is, according to the configuration of the high performance cassette B, both the concave portion 15 without a claw and the erroneous erasure prevention detecting portion 18 must be provided on the back surface 14, so that the area of the label for displaying the recorded contents ( There is a problem that the size of the recess 19 in the longitudinal direction becomes small, and the display content is limited accordingly.

On the other hand, for example, in a tape cassette having a structure as disclosed in Japanese Utility Model Publication No. 4-50618, the type of tape,
A detection hole for detecting cassette information such as tape thickness and erroneous erasure prevention, and a lid member as an erroneous erasure prevention detection member for opening and closing the detection hole are provided on the bottom surface of the lower half of the cassette housing. It is desired that the amount of cassette information be increased in parallel with the diversification of tape types and tape thicknesses, and it must be provided on the lower half side and on the bottom side in consideration of the balance with the members on the device side. It comes from the situation that there is no. Then, in this type of tape cassette, the detection hole is set to be opened or closed by a lid member according to the cassette information to be detected, and the tape cassette is set to, for example, VT.
When mounted on R, the above-mentioned cassette information can be detected by detecting the open / closed state of the detection hole by an information detection pin which is provided on the VTR side and which is always provided with elastic force in one direction by an elastic member. It was done like this.

At this time, when the detection hole is in the closed state, the lid member pushes down the information detection pin by elastic force, and when the detection hole is in the opened state, the information detection pin is pushed down. Without this, the detection pin is inserted into the detection hole so that the signal matching the cassette information can be detected by the difference in height of the information detection pin.

However, according to the tape cassette having the configuration described in this publication, even if the sliding operation of the erroneous erasure prevention claw is not a problem, when detecting the open / closed state of the detection hole,
Since no countermeasure is taken against the force of the contacting information detection pin in the push-up direction, the erroneous erasure prevention claw sometimes moves upward due to the contact force of the information detection pin, resulting in erroneous detection. There was a problem that it would end up.

[0019]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the erroneous erasure prevention detecting portion 18 is arranged on the bottom surface without being provided on the back surface 14, and erroneous detection of upward elastic force of the information detecting pin is performed. As a preventive measure against this, the lower half is provided with a plurality of wall portions integrally formed with the lower half half at the time of molding, and this wall portion also improves the smoothness of operation of the opening / closing member for preventing erroneous erasure. . That is, the present invention is directed to a cassette housing including upper and lower halves that accommodate reels around which tapes are wound, a lid that opens and closes a front opening of the cassette housing, and a plurality of lids formed on the bottom surface of the lower half. An opening portion, a wall portion provided on the upper surface side of at least two of the plurality of opening portions formed in the lower half, and arranged between the opening portion and the wall portion, The present invention provides a tape cassette including an opening / closing member that opens and closes an opening.

[0020]

1 (A) is a schematic bottom view of a lower half of a tape cassette C according to the present invention, FIG. 1 (B) is an enlarged view of a main part of a rear corner of the same, and FIG. Is a cross-sectional view taken along the line XX of (B), and (D) and (E) show the pre-operation state and the operation state when the erroneous erasure prevention member is mounted in the state of (C). 2A is a plan view of an erroneous erasure prevention member that constitutes a part of the tape cassette C according to the present invention, and FIG. 2B is a sectional view of FIG. 3 is a rear view of the tape cassette C according to the present invention, and FIG. 4 is a rear view of the tape cassette C according to the present invention.

In FIG. 1A, 3a is a side surface portion provided on the lower half 3, 3b is the same rear surface portion, 24 and 25 are upper wall portions, 28 is a through hole, and 50 is for erroneous erasure prevention. It is an opening and closing member. In FIGS. 1 (B) and 1 (C), reference numeral 20 denotes a boss portion that is integrally formed with the bottom wall portion 40 of the lower half 3 at the time of molding, and is used for connecting the upper and lower halves with screws or the like in a state where the lids are fitted together. The insertion hole 21 is formed in the center thereof. Reference numerals 22 and 23 denote standing wall portions that are integrally formed with the bottom wall portion 40 of the lower half 3 during molding. It should be noted that one of the standing wall portions 23 has a first protrusion 23a in the longitudinal direction thereof.
₁ , 23a ₂ are provided and the second protrusion 23 is provided.
b ₁ and 23b ₂ are formed integrally with it. 24, 2
5 is the bottom wall portion 40 of the lower half 3 and the upstanding wall portion 2 respectively.
4a and 25a are upper wall portions integrally formed with each other, and these have a predetermined length so as to have an inverted L shape with respect to the vertical wall portions 24a and 25a. The lower surfaces 24b and 25b of the upper wall portions 24 and 25 having the predetermined lengths are
The bottom wall portion 40 of the lower half 3 is formed to have the same height.

26 is below the above-mentioned upper wall portion 24,
Square holes formed in the bottom wall portion 40 of the lower half 3,
Reference numeral 7 is a detection hole formed below the upper wall portion 25.
Reference numeral 28 is a through hole formed in the bottom wall portion 40 of the lower half 3 for the purpose of clearly indicating that this is a high performance tape cassette. That is, in this type of tape cassette, a high-performance tape cassette itself has a through hole provided at a predetermined position in the rear corner of the bottom surface of the lower half.

29 is an inner wall provided inside the side surface portion 3a, 30 is an inner wall provided inside the back surface portion 3b, and these inner walls 29 and 30 are integrally formed when the lower half is molded. However, if necessary, the opening / closing member 50 for preventing erroneous erasure, which will be described later, may be made of a material that allows the opening / closing member 50 to be smoothly carried out, for example, if necessary. Of course it's good.

Reference numeral 31 is a step portion, which has a shape such that a guide surface 56a of a guide portion 56 integrally formed with the opening / closing member 50 for preventing erroneous erasing is placed when the opening / closing member 50 for preventing erasure is mounted. Has been formed. Reference numerals 32a and 32b are inclined portions formed on the side of the back surface portion 3b of the square hole 26 described above.

Next, the specific structure of the opening / closing member (hereinafter referred to as the opening / closing member) 50 for preventing erroneous erasure will be described with reference to FIG.
This will be described with reference to (B). Reference numeral 51 is a part in the longitudinal direction of the opening / closing member 50, and a projecting portion that projects upward in the width direction, 52 is a contact portion that also forms a part in the longitudinal direction,
Reference numeral 53 is also a part in the longitudinal direction and a tip part extended to the tip thereof, and part of the tip part is the first protrusions 23a ₁ and 23a ₂ provided on the standing wall 23. And the recess 5 for engaging the second protrusions 23b ₁ and 23b _2.
3a ₁ and 53a ₂ are formed. Reference numeral 54 is an intermediate portion formed between the protruding portion 51 and the contact portion 52.

Reference numeral 55 denotes an abutment portion integrally formed through a vertical wall portion 60 so as to be parallel to the abutment portion 52, and 56 denotes an abutment portion.
It is a guide part, which is the contact part 55 and the connection part 5 described above.
It is connected via 6b. Incidentally, 56a is a guide surface provided at the tip of the guide portion 56, and 56c is a tip surface. When the opening / closing member 50 is inserted between the standing wall portions 22 and 23 and the upstanding walls 29 and 30 at the rear corner portion of the lower half 3 described above and mounted at a predetermined position at the rear corner portion of the lower half 3, 57 Reference numeral 58 is a square hole for preventing the upper wall portion 24 from coming into contact with each other, and reference numeral 58 is a bottom wall portion formed on the lower surfaces of the contact portions 52, 55 and the standing wall portion 60.

The bottom wall 58 and the guide surface 56a
The height between them is formed to be smaller than the dimension between the lower surface 25b of the upper wall portion 25 of the lower half 3 and the step portion 31 described above, while between the bottom wall portion 58 and the projecting portion 59a of the operating portion 59. The height is the lower surface 24b of the upper wall portion 24 of the lower half 3 described above.
It is formed smaller than the dimension between the bottom portion 41 and the bottom portion 41. Further, the height dimension of the bottom wall portion 58 and the bottom portion 58a on the lower surface thereof is formed to be slightly smaller than the dimension between the bottom wall portion 40 of the lower half 3 and the lower surface 24b of the upper wall portion 24.

As described above, the dimension of the vertical wall portion 60 in the width direction, that is, the dimension between the contact portions 52 and 55, is the vertical wall portions 22 and 23 at the rear corner of the lower half 3 and the vertical wall 2.
Due to the fact that it is inserted between 9 and 30, it is formed to be slightly smaller than the dimension of the standing wall portions 22 and 23 and the standing wall 30 in the width direction.

The open / close member 50 is attached to a predetermined position of the lower half 3 in one direction 59, for example, as shown in FIG. 1C.
In the operation part 59, the operation part 59 is provided with a protruding part 59a at a part thereof for facilitating the operation.
Is provided. It should be noted that, as can be understood from the above description, the protruding portion 59a is formed so that its length in the width direction is longer than that of the guide surface 56a. Therefore, when the opening / closing member 50 is mounted on the lower half 3 at a predetermined position, the projecting portion 59a is located at a position in the square hole 26 where it can be slid.

Incidentally, the protruding portion 5 of the mounted opening / closing member 50.
Needless to say, the length of 9a does not protrude from the lower surface of the square hole 26, that is, the bottom surface portion 41 of the tape cassette C in FIG.
Further, when the projecting portion 59a is mounted, the slanting operation is very easy because the inclined portions 32a and 32b are formed in the square hole 26.

Next, a description will be given of the point that the opening / closing member 50 is mounted at a predetermined position on the rear corner of the lower half 3 so as to have an erroneous erasure prevention function. First, with the opening / closing member 50 in the state shown in the sectional view of FIG. 2B, the abutting portions 52 and 55 are grasped so that the projecting portion 51 faces upward, and the rear corner portion of the lower half 3 as described above. When inserted between the standing wall portions 22 and 23 and the standing walls 29 and 30 in the direction orthogonal to the paper surface in FIG. 1B, the contact portions 52 and 55 of the opening / closing member 50 and the standing wall portion 60 are Since they are configured in the dimension and shape as described above, they are the standing wall portion 22, the standing wall 29, and the standing wall portion 29 of the lower half 3.
It is guided by 30 and is smoothly mounted at a predetermined position. That is, the bottom surface portion 58a of the opening / closing member 50 is arranged in contact with the bottom surface wall portion 40 of the lower half 3, and the protruding portion 59a is arranged in the square hole 26 without protruding from the bottom surface portion 41. The guide surface 56a of the guide portion 56 is also arranged on the step portion 31 (see FIG. 1D). Further, in this state, the concave portion 53 of the tip end portion 53 of the opening / closing member 50.
a ₁ and 53 a ₂ are the first protrusions 23 of the standing wall 23.
a _1, and 23a ₂ and click to engage (Fig. 1
(See (A)). The state of FIG. 1A is, for example,
It is assumed that the high-quality tape cassette has already been recorded in the desired high image quality mode and is in a state in which erroneous recording is prevented.

Here, a case will be described in which the high performance tape cassette C according to the present invention in the state of FIG. 1A is mounted on the VTR and recording is performed in, for example, the high image quality mode which is the second mode. First, for example, the protruding portion 59a of the operating portion 59 of the opening / closing member 50 in the state of FIG. 1D is gripped, for example, and the tip end portion 56c of the guide portion 56 abuts the upright wall portion 25a in the arrow direction, and The recesses 53a ₁ and 53a ₂ provided in the tip portion 53 are the second protrusions 23b of the standing wall portion 23.
Slide to the position where it click-engages with ₁ , 23b ₂ . At this time, since the dimensions of each part of the opening / closing member 50 and the dimensions of each part of the rear corner of the lower half 3 are in the relationship as described above, they are smoothly slid and engaged in a click manner. As a result, it is securely fixed in place. By the sliding operation of the opening / closing member 50 in the above-described direction, the guide surface 56a of the guide portion 56 slides in the arrow direction, which closes the detection hole 27 (see FIG. 1 (E)). As described above, when the high performance tape cassette C according to the present invention in which the detection hole 27 is closed by the guide surface 56a is mounted at a predetermined position of the VTR, first, the through hole 28 is formed, so that the VTR side is formed. Then, this tape cassette is determined to be a high-performance tape cassette and switched to the high image quality mode.

Next, the information detection pin provided on the VTR side is pushed up from below the detection hole 27. However, in this information detection pin, the detection hole 27 has the guide surface 56a.
Since it is closed by, it cannot move upward any more. That is, the information detecting pin sends a judgment signal to the VTR that the tape cassette may record the information signal. This makes VTR
Is for performing a predetermined recording operation and recording a desired information signal.

When the high performance tape cassette C according to the present invention in the state shown in FIG. 1A is mounted on the VTR, the VT
The information detection pin provided on the R side is inserted into the detection hole 27 and stops in a state of contacting the lower surface 25b of the upper wall portion 25a. As a result, the information detection pin sends a judgment signal to the VTR indicating that the tape cassette should not be erroneously recorded, because the information that should not be erased from this tape cassette is recorded.
As a result, the VTR does not perform the recording operation, but is switched to the reproduction mode, for example.

[0035]

As described in detail above, the tape cassette according to the present invention includes a cassette housing having upper and lower halves in which reels around which tapes are wound are stored, and a lid for opening and closing a front opening of the cassette housing. A body, a plurality of openings formed on the bottom side of the lower half, a wall provided on the upper surface side of at least two openings of the plurality of openings formed on the lower half, and Disposed between the opening and the wall,
Since the opening and closing member is configured to open and close the opening, when the tape cassette is mounted at a predetermined position of the device and a predetermined operation is performed, the information detection pin moves upward to prevent accidental erasure. There is no possibility that the opening / closing member may move and cause erroneous detection even when the member comes into contact with the member. Further, since the opening / closing member for preventing erroneous erasure is mounted at a predetermined position only by the lower case, it has a feature that it can be used as a temporary fixing at the time of assembly and the assembling property can be improved.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the internal structure of a tape cassette according to the present invention.

FIG. 2 is a specific configuration diagram of an erroneous erasure prevention member that constitutes a part of the tape cassette according to the present invention.

FIG. 3 is a rear view of the tape cassette according to the present invention.

FIG. 4 is a rear view of the tape cassette according to the present invention.

FIG. 5 is a schematic overall view of a conventional magnetic tape cassette.

FIG. 6 is a plan view of removing the upper half of a conventional magnetic tape cassette.

FIG. 7 is a side view of a magnetic tape cassette in which a high performance tape is stored.

[Explanation of symbols]

 11 cassette housing 12 upper half 13 lower half 14 back surface 15,19 recess 24,25 upper wall 26 square hole 27 detection hole 28 through hole 50 opening / closing member

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[Procedure amendment]

[Submission date] April 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic bottom view of a lower half of a tape cassette according to the present invention.

FIG. 2 is an enlarged view and a partial cross-sectional view of a main part of a rear corner portion of a lower half of a tape cassette according to the present invention.

FIG. 3 is a cross-sectional view of essential parts showing a pre-operation state and an operation state when an erroneous erasure prevention member is attached to a part of the lower half of the tape cassette according to the present invention.

FIG. 4 is a specific configuration diagram of an erroneous erasure prevention member which constitutes a part of the tape cassette according to the present invention.

FIG. 5 is a rear view of the tape cassette according to the present invention.

FIG. 6 is a rear view of the tape cassette according to the present invention.

FIG. 7 is a schematic overall view of a conventional magnetic tape cassette.

FIG. 8 is a plan view of removing the upper half of a conventional magnetic tape cassette.

FIG. 9 is a side view of a magnetic tape cassette in which a high performance tape is stored.

[Explanation of reference numerals] 11 cassette housing 12 upper half 13 lower half 14 back surface 15,19 concave portion 24,25 upper wall portion 26 square hole 27 detection hole 28 through hole 50 opening / closing member

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 4]

[Figure 5]

[Figure 3]

[Figure 6]

[Figure 9]

[Figure 7]

[Figure 8]

Claims (1)

[Claims] 1. A cassette housing comprising an upper half in which a reel around which a tape is wound is accommodated, a lid body for opening and closing a front opening of the cassette housing, and a plurality of bottom housings formed on the bottom side of the lower half. An opening, a wall provided on the upper surface side of at least two of the plurality of openings formed in the lower half, and the opening arranged between the opening and the wall. A tape cassette consisting of an opening and closing member that opens and closes the section.