JPS5936382A - Optical cassette tape - Google Patents

Abstract

PURPOSE:To simplify and miniaturize an optical cassette tape device and to improve the optical recording/reproduction, by inserting a rotary drum between a roll-out and take-up reels which are arranged on the same axis and winding a tape helically round the rotary drum. CONSTITUTION:The 1st and 2nd reels 20 and 21 are set on the same axis, and a rotary drum 22 is inserted between these reels 20 and 21 also on the same axis. A tape is wound helically round the drum 22 through notches 23 and 24 of the drum 22. These reels 20 and 21 and the drum 22 arranged on the same axis are stored into a housing main body 13 containing a transparent recording/ reproducing window 16 through which the laser light passes. This eliminate the use of a rotary reproducing head for optical recording and reproduction, and a direct contact is not given between a head and the tape. This attains a simple and miniature constitution for an optical cassette tape device and ensures satisfactory optical recording and reproduction.

Description

[Detailed Description of the Invention] Technical Field This invention is an optical cassette tape that stores a tape for optical information recording and playback, and the evaluation system information can be recorded on the tape as an optical recording medium in a digital, tj, or analog format. Magnetic tape is commonly used as a recording medium for recording information on cassette tapes used in optical recording and reproducing devices that optically record high-density information from the tape and optically reproduce information from the tape. However,
Due to the nature of magnetic tape, there are limits to high-density recording and improvement of noise characteristics, and as a way to improve this, optical recording and reproducing devices that use laser beam spots to record and reproduce information have recently attracted attention. , has been developed. These optical recording and reproducing apparatuses are broadly classified into those using tapes and those using disks as optical recording media, and the present invention relates to a cassette tape that is effective for the former type.

Tape-type optical recording media device R creates micro holes (information pits) of about 1 pm on one side of the tape by irradiating a laser beam spot.
On the other hand, the information is reproduced by irradiating a laser beam spot onto the tape on which the information is recorded and detecting the reflected light or transmitted light. Usually, such a long optical tape is wound around a pair of reels and housed in a housing to form a cassette.

One of the pair of reels is a tape feeding reel, the other is a take-up reel, and the distance between the two reels is l1.
Information is recorded and played back on the tape fed in the i11 direction. To explain the peripheral equipment, (1) is a cassette tape 7', (21 is an optical head for recording and reproducing.) A cassette tape (1) A pair of two cassette tapes are housed in a thin rectangular box-shaped plastic housing (3). 1st and 2nd reels f4) (Lll are distributed with their axes parallel to each other at regular intervals on the same plane and rotatably, and are wound on the first reel (4) for tape feeding. The tape (6) has multiple tape guides +7t h+
... and then it is wound onto the winding reel @2 reel ff1l.

Tape (6) is in most cases a T on the outer surface of the plastic tape.
A recording layer made of a metal thin film of e-^5-8e is formed. The optical head (2) is mounted on at least two locations on the outer peripheral surface of the rotating drum (8).
The structure is equipped with q+. The cassette tape tll is equipped with a mechanism that rotates the throat (2) and a cassette tape (1).
) is removably set in an external device that has a reel rotation drive system, etc., and when recording and playing, it is set. 11 (is actively curved by an external means and curved on the outer surface of this curved part (6') to form a rotating drum (8).
is -5[-'(around), the machine approaches with an oblique angle θ and rotates at high speed in the opposite direction to the machine gear traveling.At the same time, the optical pickup in
) (Laser light is emitted from 9+, its spot helically scans the recording surface of the curved part (6) of tape (6), and information is recorded or reproduced from 4/+L. Tape (
6) Information is recorded in information tracks T that are densely packed at an angle θ as shown in FIG. For example, information for one frame on both sides of the ORT is recorded on this one information track T.

However, the conventional cassette tape (Iris) described above has the following problems.

(a) Since two reels (4Hii) are arranged in parallel, it can be made as thin as the cassette tape (1), but it takes up a large area and requires a large size to be installed on external equipment.

(b), the curved running surface of the tape (6) facing the rotating drum (8) is about half the circumference of the rotating drum (8). It is necessary to attach the pickup (9) to the circumferential surface of the rotating drum (8), which complicates the structure of the optical head (2).

(C) The cassette tape (1) is set, and the external equipment includes a motor for rotating the reel of the cassette tape fl+,
There are many types of motors (1f) that rotate the optical head (2).
The optical H11 recording and reproducing apparatus is expensive and large in size because it requires four types of motors.

(Recording and reproducing is performed by rotating the optical head (2) at high speed, and the optical head (2) uses a laser light source, a light-receiving element for information reading, and the frame of the laser light spot that scans the tape (6). - Due to the complex structure of the lens system, which includes a movable objective lens that also serves as scrap control and tracking control, it is difficult to electrically connect it to an external electric circuit when rotating it at high speed, and it is difficult to move it. When the objective lens rotates at high speed, focus control and tracking control are affected by centrifugal force.

(e) During recording and playback, it is necessary to move the recording surface side of the tape (6) directly or indirectly onto the outer peripheral surface of the optical head (2), so the recording surface of the tape (6) is easily scratched. Noise characteristics tend to deteriorate and durability is poor.

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a cassette tape capable of solving the above-mentioned problems, and as a means for achieving the object, a pair of reels for feeding and winding the tape are disposed coaxially, A reel consisting of a pair of reels and a rotating drum, in which a rotating drum for recording and playback is coaxially inserted between a pair of reels, and the tape between both reels is slidably wound helically around the outer periphery of the rotating drum. The unit is rotatably housed in one housing. By using such a cassette tape, the cassette tape and its peripheral equipment can be made more compact, and a fixed optical head for recording and reproducing can be used, so that the above objectives can be easily achieved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 4 and 5 show a cassette tape 00 according to the present invention.
To give an example and explain the removal with reference to the exploded views in Figures 6 and 7, (o) r is made of plastic, and θ is rotatably housed in the housing (11). This is a reel unit. The housing (11) is composed of a substantially rectangular box-shaped main body O with a bottomed opening and a cover plate 04) that closes the opening of the main body 0 and is fastened with screws 05). There is a transparent recording/reproduction window θC) through which laser light passes in the center, and a reel unit (O?) is located on the rear wall. )
Rotation control notch 1! (lno07) is further formed in the center of the bottom surface to rotatably support the reel yue [12] and a bearing protrusion (l→) through which the motor rotation shaft is inserted, and the lid body θ4) K has an inner surface. A deep remaining amount check window (l→) is formed through which one can look.If this housing (II) is made of a transparent plus deck, there is no need to specially provide the above-mentioned seats 6c) and 6h).

As shown in Fig. 7, the reel unit (+2) consists of eight parts coaxially assembled: a first reel for feeding the tape (b), a second reel for winding the tape (1), and a rotating drum holder for recording and reproducing. be. Rotating drum (7 is a coaxial outer cylinder (22
a), an inner cylinder (22b), and a partition plate (22g) that divides the space surrounded by both into two in a direction perpendicular to the axial direction. A notch is formed at the height of the tape width at the location. Rotating drum (the first one in the ring-shaped space above and below the fourth
The reel Qφ and the second reel 1) have their respective center holes (26+
ai+ is rotatably inserted into the inner cylinder (22b) and housed coaxially. 1 for the first reel 1) and the second reel 1)
A long optical Chibre poem of the book is wound in the same direction, and the tape Q extending from the first reel is led out of the drum through the rotary drum (24 notches tA (c)), and the tape Q
It is wrapped slightly around the outer circumference of the audience in a helical manner,
It is introduced into the drum through the other notch (24) and wound around the second reel ff1ll. A guide groove (2 (2
) is formed, and the tape (219t) is fixed in the guide groove on the side and is helically scanned.The first and second reels (c) 6
211t and tape winding cylinders (20a) (21a) respectively.
) at the upper and lower ends of the circular outer @ (20b) (21b) and inner ring (
It is a lightweight plastic product in which 20C) (2IC) are connected together concentrically.For example, the outer ring diameter of the first reel (201) is 1, and the outer ring diameter of the second reel (n1) is p2. Assuming that the rotating drum (2 outside \' = lD, (D
, <D, and each adventitia 20b)
(21b) It is set to rotate along the upper and lower end surfaces of the outer cylinder (22a) of the rotating drum (22).The tape (B) has a recording surface on the outer side. etc. may be the same as the conventional one.

The optical recording and reproducing operation using the above-mentioned cassette tape pan rotates the entire reel unit θ2) at high speed in one direction, while applying an appropriate brake only to the second reel 01) to slow the rotation speed slightly compared to the others. This is done by simultaneously feeding the tape. Tape rewinding is still performed by rotating the reel unit (2) at high speed in the same direction and rotating the first reel at a higher speed than the others.

Operations such as tape feeding, tape rewinding 17, etc., and recording and reproducing operations during tape feeding are performed by, for example, an optical recording and reproducing apparatus as shown in FIG.

In Fig. 8, 7) e is the case, (the part is the playback display device built into the case, the V mark is the concave part for attaching sumo wrestler tape formed on a part of the upper surface of the case Q, and the four parts are ) is vertically installed with the rotating shaft (1) of one unidirectional constant-speed rotation drive motor (B), and the optical head is embedded in the front side in a fixed position, and the side surface is In the reel unit) (12), a rotary drive control mechanism for varying the rotational speed of the first and second reels H'++, such as an acceleration roller (F) and a brake roller (C), are installed to freely protrude. be done. 4qti) This is a protective lid with a transparent window that can be freely opened and closed at the opening of the l'L fourth part a9). When the cassette tape (10) is set in the recess, the optical head (3) faces the housing (3) and the housing (1) near the transparent window 0φ, as shown in FIG. 11)
Pass the outer ring (20b) of the first reel (goods) through the notched ring of
The outer ring (21
PK is located opposite the outer periphery of b). Each row 294) has a pivot e1 at the tip of the swinging arm (I7'l rest).
9) Rotatably supported by M, one acceleration roller has a large diameter part (84a) and a small diameter part (84b) and is used for expansion during the operation described later, and the other brake roller (
C) rotates with a constant brake applied. The motor rotation shaft 01) is connected to the rotating drum (21J inner cylinder (22b)
At this time, the two are fitted in a idling-stop structure, and after that, the rotary drum rotates together with the rotary shaft (31).

Next, we will explain the recording/reproduction etc. made by +(ilJ) using the above configuration.

During recording or playback, as shown in Fig. 10, only the brake roller is moved forward and the outer ring (21M) of the second reel 1) is moved forward.
is brought into elastic contact with a part of the outer peripheral surface of the motor, and in this state, the motor (rotation axis e++ by starting the rope) is rotated at a constant high speed in the direction of the arrow. Then, the entire reel unit (of course) becomes the rotating shaft (
31), but only the second reel 621) is braked by contact with the brake roller, so it rotates a little slower than the others. Therefore, the second reel (21) is rotating in the same direction as the others,
When viewed from the first reel (0), it apparently rotates in the opposite direction, and the tape (2) rotates at high speed as a whole, sending it from the first reel (1) to the second reel (1) and winding it up. Between the two, the ball flies over the outer periphery of the rotating drum.

At the same time, if the laser beam spot from the optical head is irradiated vertically onto the tape (2) on the outer periphery of the rotating drum (A) in synchronization with the rotation of the reel unit 09), information will not be recorded or reproduced. When the time is 11, the information screen is projected on the screen of the display device (to) using the playback signal.

Incidentally, as shown in the figure, the optical head (c) can be of a fixed type without rotation, like a normal disk type. In other words, since the tape 4 is wound one or more times around the circumferential surface of the rotating drum (22), recording and playback are interrupted when the tape (c) runs. This eliminates the need to use a dust-covered rotary head. Furthermore, if four frames are recorded per rotation, the number of rotations of the drum can be reduced in inverse proportion.

If you want to make the double-sided image of the display device Risakaki 11P11-, rotate the reel unit 02 at high speed by 1'' while separating the player roller 0yen from the second reel (21).Then, the second reel (21) ) rotates at the same speed as the center, and the feed of the cheap Q stops, so that the tape (laser beam sub 7 on only one information track T on 21n) is repeatedly moved 17 to obtain a still image.

When rewinding the tape (21Q) after recording and playback is completed, the reel unit (12) is rotated in the same direction at the same high speed as shown in Fig. 11, and only the acceleration roller G4J is advanced to rewind its large diameter section. (84a) is pressed against the outer circumference of the outer ring (21b) of the Ml reel ψ0), and
4b) is pushed back onto the outer periphery of the rotating drum. Then, the acceleration roller 434) rotates around the rotating drum (the small diameter portion (
It rotates at the driven rotational speed of B4b), so the first reel a2, which corresponds to the large diameter part (84a), rotates faster than the others! i
The tape is rewound from the second reel to the rotating drum (from the outer periphery of 4 to the first reel).

In addition, the control of tape feeding, tape feeding stop, and rewinding of the tape at the rotational speed of the first and p[\2 reel [1) f2+) in the reel unit 02) is performed using the roller tA41 ('15 ) is not limited to the contact method.
actual. , 1 Magnetic brake + 1 to obtain stable operation
It is desirable to adopt a non-contact method such as a 4-way construction or an air brake TRPT construction. The shapes of the trench reel unit (12) and the housing (11) are not limited to the above embodiments.

As described above, according to the present invention, by stacking the reels in the axial direction, it is possible to make the cassette chip more compact, and the installation area for external N goods equipment is reduced to about 1/2 compared to the conventional one. It is possible to reduce the size of equipment to 1 (11). Tape forwarding and tape rewinding can still be performed by rotating the IJ-le unit in the same direction and at the same speed, and an F7.1 type optical head is used for recording and playback. As a result, it is possible to simplify the structure by reducing the number of motors installed in external equipment, reduce the cost of optical recording and reproducing devices including cassette tapes, and improve the performance of optical heads, as shown in Figure 1. Since the surface travels between reels without contacting an external member, tFI scratches on the recording surface are drastically reduced, resulting in lower noise characteristics and longer tape life.

[Brief explanation of the drawing]

Figures 1 and 2 are a schematic plan view and partially enlarged front view of a pile showing an example of an optical recording/reproducing 4q arrangement using a conventional cassette tape, a partial view of the 8F (lIi optical-optical jeep, Figure 4, 5. I'lI N, a perspective view and an enlarged sectional view taken along the line X-X showing one embodiment of the cassette tape of the present invention; FIGS. 6 and 7 are exploded views of the whole and part of the cassette tape of FIG. 4; Perspective view, Figure 8 1-t, perspective view showing an example of an optical recording and reproducing device using the cassette tape of Figure m4, l'W9
The figures are a partial enlarged cross-sectional view of the cassette development in Fig. 8, and Figs. 101 and 11 (-). The diagram is: 00)...Cassette tape, ('')...Housing, (+2)...Reel unit), (7!0)...
・First! J - le, si 1)... 2nd reel, (2
Death...rotating drum, four...tape. Figure 8 32 Figure 9-502- u Figure 10 sli flash

Claims (1)

[Claims] (1) A pair of first and second reels for winding tape, which is an optical recording medium, for feeding and winding are both housed on both sides in the axial direction of a rotating drum at a rotational angle of flH, and between the two reels An optical force setting tape comprising: a reel unit in which the tape is helically wound around the outer periphery of a rotating drum so that it can travel; and a housing rotatably housing the reel unit.