JPH05225750A - Tape cartridge - Google Patents

Abstract

PURPOSE:To easily and surely mount a transmission window on a cover, in a tape cartridge arranged so that the transparent transmission window for a tape end detecting light is mounted on the opaque cover then the tape end is detected by the tape end detecting light transmitted through the window. CONSTITUTION:In the tape cartridge 1 constituted so as to form a window frame part 6 for mounting the transmission window 5 for the tape end detecting light on the cover 3 and to insert the transmission window 5 to the window frame part 6 for mounting thereon, an engaging part 8 and a part 7 to be engaged to fix the transmission window 5 in the window frame part 6 by engaging each other when the above-mentioned transmission window 5 is inserted to the window frame part 6, are provided at both sides of the transmission window 5 in the inserting direction and at both sides of the window frame part 6 confronted therewith.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cartridge capable of detecting the tape end with a tape end detection light emitted from a drive (recording / reproducing apparatus) side, and more particularly to a tape end detection on a tape cartridge cover. The light transmitting window can be easily and surely assembled.

[0002]

2. Description of the Related Art As shown in FIG. 9 as a tape cartridge, a base plate 101 having a tape supply hub (reel), a tape take-up hub (reel) and the like (not shown) arranged on the upper surface thereof, 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. 1
01 to the tape cartridge 1 from the light introducing portion 105
When the magnetic tape 108 is introduced into the optical disc 06, 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 taped. The tape end detection light 104 is transmitted while the end detection light 104 is transmitted.
Is transmitted through the side plate 110 of the transparent cover 102,
It is known that the light receiving unit 111 provided on the drive side receives light to detect the tape end.

The side plate 110 of the cover 102 has an inner side surface 110b of approximately 1 ° with respect to an outer side surface (vertical surface) 110a.
It is tilted.

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. 10, the window frame portion 1 is attached to the side plate 110 of the cover 102.
21, a transparent window 122 for transmitting the tape end detection light is inserted into the window frame 121, and the transparent window 122 is attached to the window frame 121 by welding 123 by high frequency, heat, or the like.
Alternatively, as shown in FIG. 11, the cover 102 and the transparent window 12
The boss portion 124 was formed on the No. 2 and the transmission window 122 was attached to the window frame portion 121 using the boss portion 124.

[0007]

By the way, when the tape cartridge of FIG. 10 is welded 123, an error or distortion of the mounting angle occurs in the transmission window 122, and the optical axis is apt to be shaken, and the tape cartridge of FIG. The tape cartridge has a boss 124
Due to the nature of the provision, there is a problem that it is easily restricted by space and it is difficult to secure sufficient mounting strength.

An object of the present invention is 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 and a tape take-up hub, and a cover attached to the base plate so as to cover the tape supply hub and the like. In a tape cartridge in which a window frame portion for attaching a transparent window for the tape end detection light is formed on the cover and the transparent window is inserted and attached in the window frame portion, Both side parts, and both side parts of the window frame part facing thereto, engaged with each other when the transparent window is inserted into the window frame part, and an engaged part for fixing the transparent window in the window frame part, The engaging part is provided.

[0010]

[Operation] When the transparent window is inserted into the window frame portion provided on the cover,
The window frame portion engages with the engaged portion provided on the transmission window and the engagement portion, and the transmission window is firmly fixed to the window frame portion and attached to the cover.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS.

1 to 7 show a first embodiment of the tape cartridge of the present invention.

1 and 2, 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 formed on a base plate 2 and on the base plate 2. It has an attached cover 3.

A window frame portion 6 for mounting a transparent window 5 for the tape end detection light is formed on the side plate 4 on the front side of the cover 3, and the transparent window 5 is formed in the window frame portion 6. When inserted, both sides of the transmission window 5 in the insertion direction,
The engaged portion 7 and the engaging portion 8 provided on both sides of the window frame portion 6 facing each other are engaged with each other, and the transparent window 5 is attached and fixed in the window frame portion 6. ..

The base plate 2 and the cover 3 of the tape cartridge 1 are formed in a substantially convex shape having a small front side area and a large rear side area, and drive the front side small area portion 9 (recording / reproducing device). ) Side for recording and reproduction.

On the large area 10 of the base plate 2, a tape supply hub (reel) 12 and a tape take-up 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 left and right sides of 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 space between the two is pressed onto the outer peripheral surface of the magnetic tape 11 wound around the tape supply hub 12, and the space between the drive roller 21 and the second corner roller 23 is wound around the tape winding hub 13. Magnetic tape 11
Is crimped to the outer peripheral surface of the.

When the drive roller 21 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 through the drive belt 24. Then, the magnetic tape 11 of the tape supply hub 12 is wound around the tape take-up hub 13 side, and when the drive roller 21 is rotated clockwise in FIG. The tape take-up hub 13 rotates counterclockwise to rewind the magnetic tape 11 from the tape take-up hub 13 to the tape supply hub 12 side.

Next, the transmission window 5 for the tape end detection light, the window frame portion 6, and the engaged portion 7 and the engagement portion 8 for attaching the transmission window 5 to the window frame portion 6, which are the gist 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 and has an inner surface 4 on the side plate 4.
As shown in FIG. 3, a is provided with a draft taper of about 1 ° with respect to the outer surface (vertical surface) 4b so that it can be easily withdrawn from the molding die.

Then, a part of the side plate 4 on the front side of the cover 3 is cut out from the lower end of the side plate 4 toward the upper surface side of the cover 3 to form a rectangular shape as shown in FIG. Is formed, and recessed groove-shaped engaging portions 8 and 8 (see FIG. 2) for locking the transmission window 5 are provided on both sides of the window frame portion 6. There is.

Then, as described above, when the transparent window 5 is inserted into the window frame 6, the engaged parts 7, 7 provided on both sides of the transparent window 5 engage with the engaging parts 8, 8. Combined, transparent window 5
Is attached to the window frame portion 6.

Next, the transmission window 5 will be described.

As shown in FIGS. 5 to 7, the transparent window 5 is made of a transparent resin such as polycarbonate in the shape of a rectangular plate having a size corresponding to the size of the window frame 6.

The thickness t of the transparent window 5 is substantially the same as that of the side plate 4 on the front side, and one side 5a thereof is
It has an inclined surface of about 1 ° similar to the inner side surface 4a of the side surface plate 4, and has engaged portions 7, 7 of convex stripes provided on both sides thereof, so that the transmission window 5 can be connected to the window frame portion. When it is inserted into 6, the engaged portions 7 and 7 of the ridges are fitted into the engaging portions 8 and 8 of the concave groove shape so that the transparent window 5 is mounted and fixed in the window frame portion 6. It has become.

Hemispherical positioning projections 31 and 31 are formed on one side surface of the engaged portions 7 and 7, and the engaged portions 7 and 7 are fitted to the engaging portions 8 and 8. At this time, as shown in FIG. 4, the positioning projections 31 and 31 are pressure-bonded to the inner side surfaces 8a of the groove-shaped engaging portions 8 and 8 so that the transmission window 5 is positioned and fixed in the window frame portion 6. It has become.

A protrusion 32 for preventing erroneous insertion is formed at one end portion of one side surface of the engaged portions 7, 7, and the inclined inner side surface 5a of the transparent window 5 is attached to the side plate of the cover 3. 4 is inserted into the inclined inner side surface 4a of the engaging portion 8, the erroneous insertion preventing projection 32 is fitted into the projection fitting concave portion 33 provided on the one end surface of the engaging portion 8 to form a transparent window. 5 is a window frame portion 6
When the transparent window 5 is inserted into the window frame portion 6 with the front side and the back side reversed, the protrusion 32 for preventing the erroneous insertion is inserted into the engaging portion 8. It engages with one end surface of the
It is designed to indicate that the front and back have been inserted by mistake.

Since the tape cartridge 1 of the first embodiment has the structure as described above, when the transparent window 5 is inserted into the window frame portion 6 without making a mistake in the front and back sides, both sides of the transparent window 5 in the insertion direction are inserted. The engaged portions 7 and 7 of the convex strip provided on the portion are fitted into the engaging portions 8 and 8 of the window frame portion 6 which are groove-shaped, and the engaged portions 7 and 7 and the engaging portions 8 and 8 While being guided by the transparent window 5, the transparent window 5 enters the window frame portion 6, and when the transparent window 5 reaches a predetermined position, the misinsertion preventing projection 32 is fitted into the projection fitting concave portion 33, and the transparent window 5 is inserted. 5 is completely inserted into the window frame 6.

FIG. 8 shows a second embodiment of the present invention. In this embodiment, the engaged portions 7, 7 on both sides of the transmissive window 5 are formed in a concave groove shape, and the engaging portions 8, 8 on both sides of the window frame portion 6 are formed in a ridge. Show.

It is to be noted that positioning projections 41, 41 and projections 42 for preventing erroneous insertion are provided on one side surface side of the convex-shaped engaging portions 8, 8.

When the slanted inner side surface 5a of the transmissive window 5 is inserted so as to be aligned with the inner side surface 4a side of the side plate 4 of the cover 3, that is, the front and back sides of the transmissive window 5 are not mistaken. 6, the projection 42 for preventing erroneous insertion is fitted into the projection fitting recess 43 provided on one side surface in the recessed groove-shaped engaging portions 8 and 8, and the transmission window 5 is a window. When it is completely inserted into the frame portion 6, and when the front and the back are mistakenly inserted, the end faces 44 of the facing engaging portions 8 of the recess 43 for fitting the protrusions are used to prevent the erroneous insertion. The transparent window 5 is prevented from being inserted into the window frame portion 6 any more by abutting on the end surface 45 of the projection 42, thereby indicating that the insertion is erroneous.

[0034]

The tape cartridge of the present invention has the structure as described above, and when the transmission window for the tape end detection light is inserted into the window frame portion, both side portions in the insertion direction of the transmission window are Engagement portions and engagement portions provided on both sides of the opposing window frame portion engage with each other, and the transmission window is firmly attached and fixed in the window frame portion.

Therefore, it is not necessary to attach the transmission window to the window frame portion by welding using a welding device as in the prior art, and the distortion of the optical axis which tends to occur when attaching by welding is prevented and the tape end is secured. There is an effect that can be detected.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a tape cartridge according to a first embodiment.

FIG. 2 is an enlarged view of a main part.

3 is a cross-sectional view taken along the line AA of FIG.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is a side view of the window frame portion and the transparent window as viewed from the inside.

FIG. 6 is a plan view of a transmission window.

FIG. 7 is a side view of a transparent window.

FIG. 8 is a perspective view of the second embodiment.

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

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

FIG. 11 is a sectional view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tape cartridge, 2 ... Base plate, 3 ... Cover, 4 ... Front side plate, 5 ... Transmission window, 6 ... Window frame part, 7 ... Engaged part, 8 ... Engagement part.

Claims (1)

[Claims] 1. A base plate and a cover attached to the base plate, wherein the cover is provided with a window frame portion for attaching a transmission window of the tape end detection light. In a tape cartridge in which a transparent window is inserted and attached, the transparent window is inserted into the window frame portion on both sides in the insertion direction of the transparent window and on both sides of the window frame portion facing the transparent window. A tape cartridge comprising: an engaged portion that is engaged with each other to fix the transparent window in the window frame portion, and an engaging portion.