JP3304339B2 - Tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel tape cassette. More specifically, an object of the present invention is to provide a small-sized tape cassette used in the same recording / reproducing device as a large-sized tape cassette and capable of further reducing the size.

[0002]

2. Description of the Related Art A recording / reproducing apparatus using tape cassettes having different sizes, that is, a so-called compatible type recording / reproducing apparatus has been proposed.

[0003]

However, in the compatible type recording / reproducing apparatus proposed in the prior art, a pair of reel bases is shared by the large and small tape cassettes. The reel hub diameter is determined based on that of a large tape cassette.

There is a limit to reducing the hub diameter in consideration of stability and rotation accuracy when the tape reel is supported on a reel base.

Therefore, when the hub diameter is determined based on that of a large tape cassette, the hub diameter of a small tape cassette becomes too large, so that the tape winding amount cannot be increased. There is also a problem that the insertion hole for making the reel stand engagement hole opened in the lower end surface of the hub face the outside is too large, and the appearance is not good.

[0006]

In order to solve the above-mentioned problems, the tape cassette of the present invention has the same recording condition.
Tes smaller than the large tape cassette attached to the playback device
Tape cassette with a recording medium tape wrapped around it.
Outside the reel hub around which the PRIR recording media tape is wound
Positioning unit for large tape cassette reel base
Located closer to the center of the tape reel,
Positioning part is larger than that of the large tape cassette.
To the reel base as well as to the center of the reel.
Position is higher than that of the large tape cassette
And protrudes from above and below the reel hub of the tape reel.
The outer diameter of the flange is smaller than that of the large tape cassette .

[0007]

Therefore, in the tape cassette of the present invention, the tape winding amount can be increased, and the tape cassette can be made more compact.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a tape cassette according to the present invention.

In the illustrated embodiment, the tape cassette of the present invention is applied to a small-sized tape cassette used in a so-called compatible type video tape recorder using a large-sized tape cassette.

For convenience of explanation, first, a large-sized tape cassette will be described.

1 is a large tape cassette and 2 is its cassette case.

The cassette case 2 is in the shape of a flat box having a horizontally-long rectangular shape when viewed in a plane, and tape outlets 3, 3 are formed at the left and right ends of the front surface.

A mouth portion 4 is formed between the tape outlets 3 on the front surface of the cassette case 2 and opens forward and downward. The mouth portion 4 serves as an opening for inserting the tape pull-out member.

Reference numerals 5 and 5 denote cylindrical tape guides which stand upright at the positions of the tape outlets 3 and 3 on the mouth 4 side.
The tape guides 5 are formed with positioning holes 6 opened in the bottom surface of the cassette case 2.

Numerals 7 and 7 are insertion holes for allowing a reel base engaging hole formed in a reel hub of a tape reel to be described later to face the outside of the cassette case 2, and are separated from the bottom wall 8 of the cassette case 2 to the left and right. Is formed.

Reference numeral 9 denotes an escape hole formed at a position slightly behind the intermediate position between the insertion holes 7 and 7 and opened on the lower surface of the bottom wall 8.

In such a cassette case 2, two tape reels 10, 10 are rotatably accommodated.
The tape reel 10 includes a cylindrical reel hub 11 and upper and lower flanges 12 and 13 integrally or integrally protruding from upper and lower ends of the reel hub 11. The lower end 11 a of the reel hub 11 projects slightly below the lower flange 13, and the amount of projection is equal to or smaller than the thickness of the bottom wall 8 of the cassette case 2. Also,
The outer diameter of the projection 11a is formed smaller than the inner diameter of the insertion hole 7 of the cassette case 2.

The reel hub 11 of the tape reel 10 has a reel base engaging hole 14 formed at the lower end thereof, and the lower end of the reel base engaging hole 14 is an enlarged diameter portion 14a. Details of the dimensions of the enlarged diameter portion 14a will be described later.

Thus, such a tape reel 10,
Both ends of the magnetic tape 15 are fixed to the ten reel hubs 11 and 11 and are wound by a predetermined amount. Such a tape reel 10, 10 is rotatably housed in the cassette case 2 with the lower end portions 11a, 11a of the reel hubs 11, 11 positioned in the insertion holes 7, 7, and the magnetic tape 15 is a part thereof. Are drawn out of the cassette case 2 from the tape outlets 3, 3, and both ends of the drawn-out portion are wound along the tape guides 5, 5 and are positioned along the front surface of the cassette case 2.

Reference numeral 16 denotes a front lid rotatably supported by the front end of the cassette case 2. The front lid 17 has a long plate shape on the left and right and covers the front surface of the cassette case 2. Sides 18, 18 projecting rearward
The front edge is the upper edge of the front part 17 and the left and right side edges are the side parts 18, 1
A continuous upper surface portion 19 is formed integrally with the upper edge of each of the upper and lower portions 8. The side portions 18 are rotatably supported on the left and right side surfaces of the front end of the cassette case 2.

The front lid 16 is urged to rotate in the closing direction by a spring means (not shown). When the front lid 16 is not in use, the closing position shown in FIG. It is located at a position that covers the front surface of the portion led out of the cassette case 2.
When the magnetic tape 15 is mounted on a video tape recorder, it is rotated by a lid opener (not shown).
Is moved to the lid opening position (see FIG. 2) in which the front side is opened.

Reference numeral 20 denotes a shutter which is slidably supported in the front-rear direction on the bottom of the cassette case 2 as in a DAT tape cassette. I have.

The shutter 20 is formed with two reel base insertion holes 21 and 21 and a single facing hole 22 which are arranged at right and left distances.

When the shutter 20 is at the front end of its moving range, that is, in the closed position, the shutter 20
Mounting holes 21 and 21 and facing hole 2 formed in
Reference numeral 2 is at a position deviated from the insertion holes 7, 7 and the relief hole 9 of the cassette case 2, respectively, whereby the insertion holes 7, 7 and the relief hole 9 of the cassette case 2 are closed by the shutter 20. Further, the lower surface side of the mouth portion 4 of the cassette case 2 is closed by the front end of the shutter 20 (see FIG. 3). Therefore, the mouse unit 4 has its front side by the front lid 16 and
The lower surfaces of the shutters 20 are closed by the shutters 20, respectively, so that the shutters 20 are completely closed to the outside.

When the tape cassette 1 is mounted on the video tape recorder, the shutter 20 moves backward and moves to the release position as in the case of the DAT tape cassette. When the shutter 20 reaches the release position,
The reel base insertion holes 21, 21 of the shutter 20 respectively correspond to the insertion holes 7, 7 of the cassette case 2, and the reel base engagement holes 14, 14 of the tape reels 10, 10 correspond to the insertion holes 7, 7 and the reel base, respectively. The insertion hole 21 is exposed to the outside through the insertion hole 21, and the exposure hole 22 of the shutter 20 matches the clearance hole 9 of the cassette case 2, and the clearance hole 9 is exposed to the outside (see FIG. 4).

Next, the small tape cassette 23 will be described.

The small tape cassette 23 has a size that is about 1 / 2.5 that of the large tape cassette 1 when viewed in a plan view.

Reference numeral 24 denotes a cassette case. The cassette case 24 has a flat box shape having a horizontally long rectangular shape when viewed in a plan view.
5, 25 are formed. The width of the cassette case 24 is substantially equal to the width of the cassette case 2 of the large tape cassette 1.
The width is approximately one-half the width of the left and right. The left and right width of the cassette case 24 is smaller than the left and right width of the mouse unit 4 of the large tape cassette 1.

A mouth portion 26 is formed between the tape outlets 25 on the front surface of the cassette case 24 and opened forward and downward. The mouth portion 26 serves as an opening for inserting the tape pull-out member.

Reference numerals 27, 27 denote cylindrical tape guides which stand upright at positions on the mouth side of the tape outlets 25, 25.
4 are formed with positioning holes 28, 28 which are open on the bottom surface. The distance between the positioning holes 28 is equal to the width of the mouse portion 4 of the cassette case 2 of the large tape cassette 1.
Is much smaller than the left and right width.

Numerals 29, 29 designate a reel base engaging hole formed in a reel hub of a tape reel to be described later.
4 and is formed in the bottom wall 30 of the cassette case 24 so as to be left and right apart from each other.

In such a cassette case 24, two tape reels 31, 31 are rotatably housed. The tape reel 31 includes a cylindrical reel hub 32 and upper and lower flanges 33 and 34 integrally or integrally protruding from both upper and lower ends of the reel hub 32. And
The lower end 32a of the reel hub 32 projects slightly below the lower flange 34, and the amount of projection is
Is smaller than or equal to the thickness of the bottom wall 30. The outer diameter of the protruding portion 32a is
Is formed smaller than the inner diameter of the insertion hole 29.

The reel hub 32 has a reel base engaging hole 35 opened at the lower end surface thereof.

Thus, such a tape reel 31,
Both ends of the magnetic tape 36 are fixed to the reel hubs 32, 32 and are wound by a predetermined amount. Such tape reels 31, 31 are rotatably accommodated in the cassette case 24 with the lower end portions 32a, 32a of the reel hubs 32, 32 positioned in the insertion holes 29, 29, and the magnetic tape 36 is a part thereof. Are drawn out of the cassette case 24 from the tape outlets 25, 25, and both ends of the drawn-out portion are wound along the tape guides 27, 27 and are positioned along the front surface of the cassette case 24.

Reference numeral 37 denotes a front lid which is rotatably supported by the front end of the cassette case 24. The front lid 38 has a long plate shape on the left and right and covers the front surface of the cassette case 24. A side portion 39 projecting rearward,
39 and the front edge are the upper edge of the front part 38 and the left and right side edges are the side part
The upper edges 9, 9 are integrally formed with the continuous upper surface portion 40, respectively. The side portions 39 are rotatably supported on the left and right side surfaces of the front end of the cassette case 24.

The front lid 37 is urged to rotate in the closing direction by a spring means (not shown). When the front lid 37 is not used, the closing position shown in FIG. It is located at a position that covers the front surface of the portion led out of the cassette case 24. Then, when the magnetic tape 36 is mounted on the video tape recorder, the magnetic tape 36 is rotated by a lid opener (not shown) and is moved to an open position where the front of the magnetic tape 36 is opened (see FIG. 7).

Reference numeral 41 denotes a shutter slidably supported in the front-rear direction on the bottom of the cassette case 24, as in the DAT tape cassette. The shutter 41 is urged forward by a spring means (not shown). I have.

The above-mentioned shutter 41 is formed with two reel base insertion holes 42, 42 which are arranged left and right apart.

When the shutter 41 is at the front end of its moving range, that is, in the closed position, the shutter 41
Are located at positions displaced from the insertion holes 29, 29 of the cassette case 24, whereby the insertion holes 29, 29 of the cassette case 24 are closed by the shutter 41. . The lower surface of the mouse portion 26 of the cassette case 24 is the shutter 4
1 is closed by the front end (see FIG. 8). Accordingly, the front side of the mouse unit 26 is closed by the front lid 37, and the lower side of the mouse unit 26 is closed by the shutter 41, so that the mouse unit 26 is completely closed to the outside.

When the tape cassette 23 is mounted on the video tape recorder, the shutter 41 moves backward and moves to the release position as in the case of the DAT tape cassette. When the shutter 41 reaches the release position, the reel base insertion holes 42, 42 of the shutter 41 coincide with the insertion holes 29, 29 of the cassette case 24, respectively, and the reel base engagement holes 35, 35 of the tape reels 31, 31 are moved. The insertion holes 29, 29 and the reel base insertion holes 42, 42, respectively.
(See FIG. 9).

Next, a video tape recorder 43 using the tape cassettes 1 and 23 will be described.

Reference numeral 44 denotes a chassis of the video tape recorder 43, and a reel support arm 45,
45 is rotatably supported. Reference numerals 46, 46 denote support shafts protruding from the rear of the chassis 44 at a substantially central portion near the rear of the chassis 44 so as to be spaced apart left and right. The base ends of the reel support arms 45, 45 are attached to the support shafts 46, 46, respectively. It is rotatably supported separately.

Reference numerals 47, 47 denote reel stands, which are rotatably supported by the rotating ends of the reel stand support arms 45, 45.

The reel table 47 has a disk-shaped mounting section 48.
And a gear portion 49 integrally formed on the lower surface of the mounting portion 48, and a reel engaging shaft 50 protruding upward from an upper end of the mounting portion 48 is provided.

The mounting portion 48 is formed in two stages, an outer large cassette mounting portion 48a and an inner small cassette mounting portion 48b, and the small cassette mounting portion 48b has a larger cassette mounting portion. It is higher than the portion 48a and has a small diameter. The tape reel 1 of the large tape cassette 1
The inside diameter of the enlarged diameter portion 14a of the reel stand engagement hole 14 is larger than the outside diameter of the small cassette placement portion 48b of the placement portion 48 of the reel stand 47 and smaller than the outside diameter of the large cassette placement portion 48a. Further, the height of the enlarged diameter portion 14a is formed to be slightly larger than the height of the small cassette mounting portion 48b projecting from the large cassette mounting portion 48a.

Thus, the reel hubs 32, 32 of the small tape cassette 23 have their lower end faces 32b, 32b positioned on the inside of the large cassette receivers 48a, 48a of the reel bases 47, 47. Since the reel hubs 32 are placed on the upper side, the outer diameters of the reel hubs 32 can be made smaller than the outer diameters of the reel hubs 11 of the large tape cassette 1. Therefore, the winding amount of the magnetic tape 36 can be increased accordingly, and the miniaturization of the small tape cassette 23 can be promoted.

The reel support arms 45 are rotatable between a large cassette driving position shown in FIG. 11 and a small cassette driving position shown in FIG. 12, and a driving gear (not shown) is provided at each driving position. Are reel stands 47, 4
7 to engage with any one of the gear portions 49 to rotate the reel base.

[0048]

As is apparent from the above description, the tape cassette of the present invention is mounted on the same recording / reproducing apparatus.
Tape cassette smaller than large tape cassette to be loaded
A tape reel on which a recording medium tape is wound.
The outer diameter of the reel hub around which the recording media tape is
Tape from the positioning part of the tape cassette relative to the reel base.
Positioning unit for the reel base
Is closer to the center of the tape reel than that of the large tape cassette.
And a positioning part for the reel base.
Is higher than that of the large tape cassette,
Outside the flange protruding from above and below the reel hub of the prill
The diameter is smaller than that of the large tape cassette .

Therefore, in the tape cassette of the present invention, the tape winding amount can be increased, and the tape cassette can be made more compact.

It should be noted that the specific structures and shapes shown in the above-described embodiments are merely examples of the embodiment for carrying out the present invention, and the technical scope of the present invention is limited thereby. Should not be interpreted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a front lid and a shutter of a large tape cassette are in a closed position.

FIG. 2 is a perspective view showing a state in which a front lid and a shutter of a large tape cassette are at a release position.

FIG. 3 is a bottom view showing a state in which a front lid and a shutter of the large tape cassette are at a closed position.

FIG. 4 is a bottom view showing a state in which a front lid and a shutter of the large tape cassette are at a release position.

FIG. 5 is a horizontal sectional view of the large tape cassette.

FIG. 6 is a perspective view showing a state in which a front lid and a shutter of the small tape cassette are at a closed position.

FIG. 7 is a perspective view showing a state in which a front lid and a shutter of the small tape cassette are at a release position.

FIG. 8 is a bottom view showing a state where the front lid and the shutter of the small tape cassette are at the closed position.

FIG. 9 is a bottom view showing a state in which a front lid and a shutter of the small tape cassette are at a release position.

FIG. 10 is a horizontal sectional view of the small tape cassette.

FIG. 11 is a plan view of the video tape recorder showing a state where the reel base is at a large cassette driving position.

FIG. 12 is a plan view of the video tape recorder showing a state where the reel base is at a small cassette driving position.

FIG. 13 is a horizontal sectional view showing a state where the large tape cassette is mounted on the video tape recorder.

FIG. 14 is an enlarged sectional view taken along the line XIV-XIV of FIG.

FIG. 15 is a horizontal sectional view showing a state in which the small tape cassette is mounted on the video tape recorder.

FIG. 16 is an enlarged sectional view taken along line XVI-XVI of FIG.

FIG. 17 is a perspective view showing tape reels of two large and small tape cassettes.

FIG. 18 is an enlarged sectional view showing tape reels of two large and small tape cassettes in comparison.

[Explanation of symbols]

1 Large tape cassette (Large tape cassette) 11 Reel hub 11a Positioning unit for reel base 23 Small tape cassette (Smaller than large tape cassette)
Tape cassette) 31 tape reel 32 reel hub 32b positioning portion relative to reel base 33 flange 34 flange 36 magnetic tape (recording medium tape) 43 video tape recorder (recording / reproducing device) 47 reel base

Claims (1)

(57) [Claims] 1. A large-sized table mounted on the same recording / reproducing apparatus.
Tape cassette smaller than the tape cassette
Insert the recording media tape on the tape reel around which the media tape is wound.
The outer diameter of the reel hub to be wound is
Closer to the center of the tape reel than the positioning part for the reel base
And the positioning part for the reel base is
If it is formed closer to the center of the tape reel than that of the
In both cases, the positioning part for the reel base is
Higher than that of the tape cassette and projecting from above and below the reel hub of the tape reel.
A tape cassette having an outer diameter smaller than that of the large tape cassette.