JPH05225752A - Tape cartridge - Google Patents

Abstract

PURPOSE:To assemble and arrange a transmission window easily and surely in a window frame part without depending on the methods of welding, etc., in a tape cartridge arranged in such a manner that the transparent transmission window for a tape end detecting light is assembled on an opaque cover and then the tape end is detected by the tape end detecting light transmitted through the window. CONSTITUTION:In the tape cartridge 1 in which a base plate 2 and the cover 3 mounted on the base plate 2 are provided and the window frame part 6 is formed for mounting the transmission window 5 on the cover 3 and also the above-mentioned transmission window 5 is inserted/arranged to the window frame part 6, the recessed parts 7 and projected parts 8 to erect the transmission window 5 on the base plate 2 by fitting each other are provided on the above- mentioned base plate 2 and transmission window 5. After the transmission window 5 is erected on the base plate 2 by the fitting of these recessed and projected parts 7, 8, the transmission window 5 is held between the base plate 2 and cover 3, and the transmission window 5 is surrounded with the window frame part 6 of cover 3 and the base plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a tape frame end provided with a window frame portion on a cover for covering a base plate provided with a tape supply hub, a tape take-up hub, etc., and a transparent transparent window mounted in the window frame portion. The present invention relates to a tape cartridge in which a tape end is detected by detecting light, and in particular, a transmission window can be easily, reliably and distortedly arranged in a window frame portion.

[0002]

2. Description of the Related Art As a tape cartridge shown in FIG. 8, a base plate 101 having a tape supply hub (reel) (not shown), a tape winding hub (reel) and the like (not shown) on the upper surface, and the tape supply hub and tape winding And a cover 102 made of a transparent plastic attached to the base plate 101 so as to cover the take-off hub and the like. The tape end detection light 104 emitted from the light emitting portion 103 provided in the drive is attached to the base plate. 10
1 to the tape cartridge 10
When the magnetic tape 108 is introduced into the magnetic tape 108, reflected by the mirror 107 and irradiated onto the magnetic tape 108, and the magnetic tape 108 is in a so-called tape end state, the detection unit 109 provided on the magnetic tape 108 is attached to the tape. End detection light 1
04 is transmitted, the tape end detection light 104 is transmitted through the side plate 110 of the transparent cover 102, is received by the light receiving portion 111 provided on the drive side, and the tape end is detected. It has been known.

In the side plate 110 of the cover 102, the inner side surface 110b is inclined by about 1 ° with respect to the outer side surface 110a.

This is a so-called draft taper required when the cover 102 is pulled out from the mold when the cover 102 is plastic-molded. In consideration of the draft taper, the light emitting portion 103 receives light. The optical axis of the tape end detection light 104 reaching the portion 111 is determined.

By the way, in the above-mentioned conventional tape cartridge, since the entire cover 102 is made of transparent plastic and the side plate 110 is also transparent, the side plate 110 is used as it is as a transmission window for the tape end detection light 104. However, in order to make the inside of the tape cartridge difficult to see, the side plate 110 cannot be used as a transmission window for the tape end detection light when the cover 102 is entirely made of opaque plastic.

Therefore, in such a case, conventionally, as shown in FIG. 9, the window frame portion 12 is formed on the side plate 110 of the cover 102.
1 is formed and a transparent transmission window 122 is inserted into the window frame portion 121, and the transmission window 122 is attached to the window frame portion 121 by welding 123 with high frequency or heat, or as shown in FIG. In addition, the boss portion 124 is formed on the cover 102 and the transparent window 122, and the transparent window 122 is attached to the window frame portion 121 using the boss portion 124.

[0007]

By the way, when the tape cartridge of FIG. 9 is welded 123, an error occurs in the mounting position and mounting angle of the transparent window 122, or the transparent window 1
22 is distorted, and the optical axis is easily shaken, and
The tape cartridge of FIG. 10 has the problems that it is easily restricted by space due to the nature of providing the boss portion 124 and that it is difficult to secure sufficient mounting strength.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a tape cartridge in which the transparent window can be attached to the window frame portion with sufficient strength without causing distortion in the transparent window. It was done.

[0009]

The present invention comprises a base plate provided with a tape supply hub, a tape winding hub, etc., and a cover attached to the base plate so as to cover the tape supply hub, etc. In a tape cartridge in which a window frame portion for mounting a transparent window for the tape end detection light is formed on the cover, and the transparent window is inserted and mounted in the window frame portion, in the base plate and the transparent window, , The recesses and the protrusions which are fitted to each other to stand up the transmission window on the base plate are provided, and the transmission window is surrounded between the base plate and the window frame portion of the cover.

[0010]

Operation: The base plate and the concave and convex portions provided on the transmission window are fitted to each other, and the transmission window is erected on the base plate.

After that, if the cover is mounted on the base plate so that the transparent window is inserted into the window frame portion, the transparent window is surrounded by the window frame portion of the cover and the base plate, and is placed in the window frame portion. It will be assembled.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to FIGS.

1 and 2 show a first embodiment of the tape cartridge of the present invention.

In FIG. 1, reference numeral 1 denotes a tape cartridge which is used as an external recording device of a computer and is generally called a data cartridge. The tape cartridge 1 is mounted on a base plate 2 and the base plate 2. It has a cover 3.

On the side plate 4 on the front side of the cover 3, there is formed a window frame portion 6 for mounting the transmission window 5 for the tape end detection light.

On the upper surface of the base plate 2 and the lower surface of the transmission window 5, there are concave and convex portions 7, which are fitted to each other.
8 is provided, and by fitting these concave and convex portions 7 and 8, the transparent window 5 is erected on the base plate 2 and then attached to the cover 3 on the base plate 2,
The transparent window 5 is sandwiched between the cover 3 and the base plate 2 and is surrounded by the window frame 6 and the base plate 2.

As shown in FIG. 1, the outer shape of the tape cartridge 1 is such that the base plate 2 and the cover 3 are formed in a substantially convex shape having a small area on the front side and a large area on the rear side. The area portion 9 is inserted into the drive (recording / reproducing apparatus) side for recording / reproducing.

On the large-area portion 10 of the base plate 2, a tape supply hub (reel) 12 and a tape winding hub (reel) 13 in which one end side and the other end side of a magnetic tape 11 as a recording medium are respectively locked. Are arranged.

A pair of left and right tape lead pins 14 and 1 are provided on both the left and right sides on the front side of the base plate 2.
5 are arranged and these tape lead pins 1
A pair of left and right rotating rollers 16 and 17 are disposed between the tape feeding hubs 4 and 15 and the tape feeding hub 12 and the tape winding hub 13, and the magnetic tape 11 is attached to the tape lead pins 14 and 15 and the rotating rollers 16 and 17, respectively. By suspending the tape, a tape running path (tape path system) is formed. By rotating the tape supply hub 12 and the tape winding hub 13 by the tape running mechanism 18 described below, the magnetic tape 11 is moved to the tape running path. Along the exposed portion 1 for introducing the head
It is designed to run while passing 9.

The tape running mechanism 18 is arranged on the drive roller 21 arranged in the central portion on the front side of the small area portion 9 of the base plate 2 and on both sides of the rear side of the large area portion 10 of the base plate 2. The first and second corner rollers 22 and 23, and the drive belt 24 suspended between the drive roller 21 and the first and second corner rollers 22 and 23. The drive roller of the drive belt 24. 21 and the first corner roller 2
The area between 2 is pressed onto the outer peripheral surface of the magnetic tape 11 wound around the tape supply hub 12, and the area between the drive roller 21 and the second corner roller 23 is wound around the tape winding hub 13. The magnetic tape 11 is pressure-bonded to the outer peripheral surface of the magnetic tape 11. And the drive roller 2
When 1 is rotated counterclockwise in FIG. 1 by a drive mechanism (not shown), the tape supply hub 12 and the tape take-up hub 13 rotate clockwise via the drive belt 24, and the tape supply hub 12 is rotated. The magnetic tape 11 is a tape winding hub 1.
When the drive roller 21 is wound in the 3rd direction and rotated in the clockwise direction in FIG.
The tape supply hub 12 and the tape take-up hub 13 rotate counterclockwise to move the magnetic tape 11 to the tape take-up hub 13.
The tape is rewound from the tape supply hub 12 side.

Next, the fitting portion 7 and the engaged portion 8 for arranging the tape end detection light transmitting window 5 on the transmission window 5, the window frame portion 6 and the base plate 2 which are essential components of the present invention will be described. ..

Prior to the above description, the structure of the cover 3 will be described first.

The cover 3 is made of an opaque plastic such as ABS resin. As shown in FIG. 2, the inner side surface 4a of the side plate 4 is about 1 ° with respect to the outer side surface (vertical surface) 4b. The taper is provided so that it can be easily withdrawn from the molding die.

A window frame 6 is formed in the cover 3 by cutting a part of the front side plate 4 from the lower end of the side plate 4 toward the upper surface of the cover 3. ..

As shown in FIGS. 3 to 4, the window frame portion 6 has a first frame portion 6a having a width A and a height B centered on the center line CL, and the first frame portion. It is formed in a substantially rectangular shape by a second frame portion 6b having a width C and a height D that are continuously provided in the 6a, and the peripheral edge portion of the second frame portion 6b has a width E and a height F within the range. A window margin 6c is provided.

Next, the structure of the transmission window 5 will be described.

The transparent window 5 is made of transparent plastic, for example, polycarbonate resin. As shown in FIGS. 5 to 6, the transparent window 5 is formed into a substantially rectangular shape by the pedestal portion 5a and the window main body portion 5b connected to the pedestal portion 5a. Has been formed.

The pedestal portion 5a is formed to have a width A'and a height B ', the window body portion 5b is formed to have a width C'and a height D', and the rim portion of the window body portion 5b is formed. Is the width E ',
A fitting margin (white) portion 5c with the frame is formed within the height F '. (The dimensional relationship between the transparent window 5 and the window frame portion 6 is A> A ', B≥B', C> C ', D>D',E>
Further, the inner side surface 5d of the transmissive window 5 is an inclined surface of about 1 ° like the inner side surface 4a of the side surface plate 4, and the pedestal portion is also provided. Protrusions 8 are provided on both sides of the lower surface of 5a.

The convex portions 8 and 8 are connected to the base plate 2
The transmissive window 5 is temporarily fixed to the base plate 2 by fitting into the recesses 7, 7 provided on the upper surface of the.

After that, if the cover 3 is mounted on the base plate 2 so as to cover it, the transparent window 5 penetrates into the window frame portion 6, and the transparent window 5 covers the base plate 2 and the cover 3.
Is surrounded by the window frame portions 6, and the alignment margin portion 5c provided on the transparent window 5 and the alignment margin portion 6c provided on the window frame portion 6
Are overlapped with each other to seal the space between the transmission window 5 and the window frame portion 6.

The tape cartridge of the embodiment has the structure as described above, and as shown in FIG. 7, the tape end detection light 32 emitted from the light emitting portion 31 of the tape end detection sensor is provided on the base plate 2. Hole 33 and
It penetrates into the tape cartridge 1 through the transparent plate 34 that closes the hole 33, is reflected by the mirror 35 formed integrally with the transparent plate 34, and is detected after the tape end of the magnetic tape 11 is transmitted. The tape end is detected by being transmitted through the window 5 and received by the light receiving portion 36 of the tape end detection sensor.

In the embodiment shown in the drawings, one side surface 5d of the transmission window 5 is an inclined surface of about 1 ° similarly to the inner side surface 4a of the side plate 4 of the cover 3 because the existing mirror, that is, The side plate 4 of the cover 3 is formed transparent and the inner side surface 4a of the side plate 4 is an inclined surface of about 1 ° so that the side plate 4 directly transmits the tape end detection light. This is so that the mirror used in the tape cartridge which has become the same can be used as it is.

Further, in the embodiment shown in the drawings, the case where the concave portion 7 is provided in the base plate 2 and the convex portion 8 is provided in the transmission window 5 is shown, however, on the contrary, the convex portion 8 is formed in the base plate 2.
A recess 7 may be provided in the transmission window 5.

[0034]

The tape cartridge of the present invention has the following effects.

(1) The base plate and the concave and convex portions provided on the transmission window are fitted to each other, and the transmission window is temporarily fixed on the base plate, and the base plate is attached so as to cover the cover. The transparent window can be fitted into the window frame portion.

(2) The transparent window is sandwiched between the cover and the base, and is surrounded and positioned between the window frame portion provided on the cover and the base plate. Therefore, for example, between the window frame portion and the transparent window. It is possible to suppress the occurrence of distortion in the transmission window by providing a slight gap in the micron unit.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a tape cartridge.

FIG. 2 is an exploded perspective view of a main part.

FIG. 3 is a front view of a window frame portion.

FIG. 4 is a bottom view of the window frame portion.

FIG. 5 is a front view of a transparent window.

FIG. 6 is a bottom view of the transparent window.

FIG. 7 is a sectional view of a main part.

FIG. 8 is a sectional view of a conventional example.

FIG. 9 is a sectional view of a conventional example.

FIG. 10 is a sectional view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tape cartridge, 2 ... Base plate, 3 ... Cover, 4 ... Side view, 5 ... Transmission window, 6 ... Window frame part, 7 ... Recessed part, 8 ... Convex part.

Claims (1)

[Claims] 1. A base plate and a cover attached to the base plate, wherein a window frame portion for attaching a transmission window of tape end detection light is formed on the cover, and the transmission frame is provided on the window frame portion. In a tape cartridge adapted to be inserted by inserting a window, the base plate and the transparent window are provided with a concave portion and a convex portion which are fitted to each other to stand the transparent window on the base plate. The tape cartridge is characterized in that a transparent window is erected on the base plate by fitting the above, and then the transparent window is surrounded between the base plate and the window frame portion of the cover.