JPH039155Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotating head type oblique scanning magnetic recording/reproducing device, and is particularly applicable to PCM tape recorders, segment type (for example, 4-head type) VTRs, code/data recorders, etc. This relates to a loading mechanism (a mechanism that pulls out a recording medium from a cassette and winds it around a rotating head cylinder).

BACKGROUND ART AND PROBLEMS A rotary head cylinder in a conventional rotary head oblique scanning magnetic recording/reproducing apparatus is shown in FIG. That is, a fixed drum 1 and a fixed drum 2 are arranged one above the other so as to be concentric with a predetermined distance apart, and between these upper and lower fixed drums 1 and 2, there are two heads 3a and 3b that rotate in a horizontal plane. A head disk 7 is rotatably provided. The axis of the shaft 4 of this head disk 7 is the fixed drum 1,
It coincides with the second axis. The magnetic tape 5 is wound diagonally over approximately 180 degrees around the circumferential surfaces of the upper and lower fixed drums 1 and 2 including the rotating head disk 7 at a lead angle α as shown in the figure, and the magnetic tape 5 runs in the direction of the arrow. be done. Two heads 3a and 3b are provided facing each other and protrude from the periphery of the rotary head disk 7, and by alternately scanning the running magnetic tape 5 with these heads 3a, the magnetic tape 5 is scanned as shown in FIG. The track 6 is formed obliquely at a recording angle θ, and a video signal is recorded.

In such a conventional rotary head diagonal scanning magnetic recording/reproducing device, the tape path system passes the tape horizontally from left to right as shown in FIG. is passed diagonally from the left to the upper right, and then horizontally to the right. Because the tape path system changes diagonally in the height direction, the configuration of the loading mechanism that pulls out the tape from the tape cassette installed in the cassette installation section of the recording/playback device and wraps it around the rotating head cylinder is extremely complicated. In particular, it has the following problems.

(1) Since the tape path system has an oblique path,
The tape guide requires an inclined guide, which complicates tape path adjustment including the loading mechanism.

(2) It is difficult to miniaturize the loading mechanism.

(3) A large number of parts are required.

(4) Lacking reliability.

(5) It is difficult to assemble and adjust the drum assembly and loading mechanism.

For example, as shown in Japanese Unexamined Patent Publication No. 57-40733, an earlier application by the present applicant, the head is moved diagonally instead of the tape, and the tape is diagonally attached to the circumferential surface of the fixed drum. There are some that do not need to be passed. However, in order to move the head diagonally like this,
The problem was that the mechanism was extremely complicated.

Effects of the invention In view of the above-mentioned points, the present invention simplifies the mechanism for moving the head in an oblique direction, thereby allowing the tape to pass horizontally around the circumferential surface of the fixed drum, while still maintaining high precision of the device. It is possible to maintain
Moreover, the present invention provides a recording/reproducing device that can be easily mass-produced.

Summary of the invention The present invention includes a fixed drum that is arranged with a predetermined gap above and below, is fixed to a substrate, and has a cylindrical surface that is in contact with the tape at a substantially right angle and at a predetermined wrapping angle; A disc-shaped rotating disk obliquely intersecting a plane including the generatrix at the center of the cylindrical surface and the axis of the fixed drum and having a head on its outer periphery; In order to cause the head to scan the tape in contact with the cylindrical surface of the fixed drum obliquely in its longitudinal direction, it is perpendicular to the rotary disk and has one end fixed to the center of the rotary disk to generate power. a rotating shaft for transmitting data; a loading member guided by the fixed drum and movable in a direction perpendicular to the axis of the fixed drum; It consists of a pair of tape guide pins arranged approximately parallel to the axis of the fixed drum, and the tape is wound around the cylindrical surface of the fixed drum by the movement of the pair of tape guide pins, and the information is transmitted through the head to the above. This relates to a recording and reproducing device that records and/or reproduces information on a tape.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 3 to 7.

3 to 7 show an embodiment of a rotary head oblique scanning magnetic recording/reproducing apparatus according to the present invention, and particularly show the structure of the rotary head cylinder. In these figures, fixed drums 11 and 12 are connected to a concentric shaft 1
3 and are arranged one above the other on the substrate 15 with a predetermined interval 22 between them. These fixed drums 1
1 and the fixed drum 12 are connected via a connector 14. The connector 14 is connected to the fixed drum 11,
12 and screws 10, respectively.
The fixed drums 11 and 12 have a cylindrical shape with left and right sides cut vertically as shown in the figure (see FIGS. 3 and 6). As described above, there is a gap 22 between the fixed drum 11 and the fixed drum 12 so that the rotary disk 18 arranged at an angle as shown in FIG. 4 can freely rotate.
1 and the upper surface 17 of the fixed drum 12,
The slope is almost parallel. The head boards 19a, 19b are attached to the rotary disk 18 with screws 20a, 20b.
These head boards 19a,
Heads 21a and 21b are attached to the outer ends of 19b, respectively. Further, the rotating shaft 23 is orthogonal to the rotating disk 18, and one end thereof is fixed to the center of the rotating disk 18 to transmit power. Therefore, the axis 24 of this rotary shaft 23 is inclined at approximately α=5° with respect to the shaft 13 (see FIG. 5).
It is assumed that the heads 21a and 21b are rotated at, for example, 1800 rpm. On the upper surface side of the fixed drum 12, there is a small diameter portion 2 of a boss 25 fitted onto the rotating shaft 23.
5a and a rotating transformer 27 mounted on the circumferential surface of this small diameter portion 25a are embedded. A large diameter portion 25b of the boss 25 projects into the gap 22, and the rotary disk 18 is attached to the large diameter portion 25b with a screw 26.
a and 26b. Note that the drum device of the VTR is provided with a rotation detection sensor such as a pulse generator, but such a sensor is omitted from illustration.

Also, inside the fixed drum 12, the rotating shaft 2
A bearing 28 is disposed on the circumferential surface of the bearing 3, and spaces 29 and 30 are formed at the upper and lower ends of the bearing 28, respectively. This space 2
Bearing nuts 31 and 32 are inserted into the bearing nuts 9 and 30, and the bearing nuts 31 and 32 are screwed onto the small diameter portion 33a of a pulley 33 that is fitted and fixed to the boss 25a and the rotating shaft 23, respectively, to fix the bearing 28. ing.

Further, a hole 34 is bored in the substrate 15, and this hole 3
4 is penetrated by the small diameter portion 33a of the pulley 33. The pulley 33 is fixed to the rotating shaft 23 with a set screw 35 screwed into the large diameter portion 33b. This pulley 33 is rotated by a belt drive, and thus the rotary disk 18 is rotated, but a direct drive system may also be used. Further, on both side surfaces of the fixed drum 12, guide grooves 36a and 36b having a rectangular cross section are provided at the same predetermined height position from the base plate 15 in the front-rear direction, that is, in the directions of arrows 42 and 43, and in the direction perpendicular to the shaft 13 (horizontally). It is formed. Bottom surfaces 37a and 37b of these guide grooves 36a and 36b are formed with high precision as reference surfaces. Guide groove 36a, 3
6b, there are loading levers 38 on both sides of a U-shaped loading member 38 as shown in FIG.
a and 38b are fitted to be able to slide smoothly in the loading direction of arrows 42 and 43, that is, in the front-back direction and in the direction perpendicular to the shaft 13. A lever pin hole 40 is bored in the center of the connecting portion 38c that connects the loading levers 38a, 38b.
It can be operated in three directions (loading direction). Loading guide pins 41a, 41b are planted and fixed at the tips of the loading levers 38a, 38b perpendicularly to the loading directions 42, 43. Therefore, the loading guide pin 41a
The axis 45a of the loading guide pin 41b, the axis 45b of the loading guide pin 41b, and the axis 13 of the fixed drums 11 and 12 are parallel axes. Further, a flange guide 46 is formed horizontally on the fixed drum 12 as a tape guide in the width direction of the tape.

Incidentally, the wrapping angle β on the peripheral surfaces of the fixed drums 11 and 12 is preferably about 30° to 90°.

Next, the tape is pulled out from the tape cassette installed in the tape cassette mounting section of the main body of the rotary head diagonal scanning magnetic recording and reproducing apparatus, and is wound onto the cylindrical surfaces of the fixed heads 11 and 12 including the gap 22 using a tape roller. The dinging operation will be explained below using FIG. 7.

Immediately after a tape cassette is installed in the tape cassette installation section of the magnetic recording/reproducing device,
A front lid 54 that opens and closes a front opening 58 of the cassette housing 53 is opened and closed by rotation. This front lid 5
The rotation of No. 4 is due to the rotation of the cassette housing 53 on both side walls 54a.
This is done around the attachment point to the When the front cover 54 is in the open state, the magnetic tape 44 wound around the pair of left and right reels 55 and 56 inside the cassette case 53 passes through the front opening 58 of the cassette case 53 as shown by the imaginary line.

The tape cassette is installed in the recording/reproducing apparatus as follows.

Before installing this tape cassette, the loading guide pins 41a, 41 of the loading member 38
b is located at the position indicated by the imaginary line in the figure. Next, when the tape cassette is pushed into the mounting section of the main body of the recording/reproducing apparatus, the front cover 54 of the cassette housing 53 is opened, and the cassette housing 53 is lowered from above and fixed at the position shown in the figure. When the tape cassette is installed in the mounting section of the recording/reproducing apparatus main body in this way, the loading guide pins 41a and 41b of the loading member 38 are inserted into the front opening 58.
It is located inside the tape 44 (inside the front lid 54 when the front lid 54 of the cassette case 53 is in the closed state) as shown by the imaginary line.

And the lever pin hole 4 of the loading member 38
0, the loading member 38 moves in the direction of arrow 42, and the loading levers 38a and 38b simultaneously move in the direction of arrow 5.
Move in 7 directions. As a result, the magnetic tape 44 is hooked onto the loading guide pins 41a and 41b and pulled out in the direction of arrow 57. and the seventh
As shown in the figure, the tape 44 is attached to the cylindrical peripheral surfaces of the fixed heads 11 and 12, including the gap 22 between the fixed heads 11 and 12, and tape loading is completed. As a result, the tape 44 from the reel 55 of the cassette housing 53 is transferred to the full-width erasing head 63,
Loading guide pin 41b, fixed head 1
Surrounding surfaces of 1 and 12, loading guide pin 41
a, the pinch roller 59 via the audio erase head 62 and the audio control head 61;
and the capstan 60 and is passed to the reel 56.

Next, the tape 44 is run and the rotary disk 18 is rotated to perform recording or reproduction. In this case, as the rotary disk 18 rotates at the lead angle α as shown in FIG. 6th
(see figure), the magnetic tape 44 is scanned diagonally. As a result, a video is recorded on the track on the tape 44 at a recording angle θ as shown in FIG. 2, or a video recording on the track is reproduced.

As can be seen from the above, since the tape 44 was conventionally configured to run horizontally as shown in FIG. 7 instead of sliding obliquely in the height direction on the circumferential surface of the drum as shown in FIG. slides on the circumferential surface of the drum horizontally, that is, in a direction perpendicular to the drum sliding surface shaft 13, and the loading shaft 13 of the fixed drums 11, 12 and the tape winding position and the tape winding release position Shaft 4 of guide pins 41a, 41b
5a and 45b are parallel to each other. Furthermore, whereas conventional loading mechanisms were separate from the drum, the fixed drum 12 is now equipped with a loading member 38. By doing so, it is possible to obtain a loading member 38 whose number of parts is reduced to 1/2 or less of the conventional one and whose assembly accuracy is good, thereby improving reliability.

The loading member 38 also includes loading levers 38a, 38b and a loading guide pin 4.
It has an extremely simple structure with 1a and 41b, and can be made smaller.

Further, guide grooves 36a, 3 provided on the fixed drum 12
The bottom surfaces 37a and 37b of 6b are connected to the loading member 3
The loading levers 38a and 38b are aligned with the arrows 42 and 43.
(loading direction). Therefore, the loading member 38 does not require adjustment and has high precision.

Further, since the tape 44 is passed in the horizontal direction, it is no longer necessary to use an inclined tape guide as in the conventional tape guide, and therefore tape path adjustment including the loading member 38 becomes extremely easy.

Furthermore, since the tape pass system is a horizontal pass system, the loading mechanism has a simple structure and mass production is possible.

In this embodiment, the flange guide 46 is provided on the fixed drum 12, but the present invention is not limited to this, and the flange guide 46 may be provided on the circumferential surface of the loading guide pins 41a, 41b.

Furthermore, the loading mechanism in the rotating head oblique scanning magnetic recording/reproducing apparatus according to this embodiment is as follows:
Applicable to loading mechanisms of PCM tape recorders, segment-type VTRs, code/data recorders, etc. In particular, in the case of the PCM bidet system, since the amount of information per unit time is small, the recording/reproducing device according to this embodiment is optimal because the wrapping angle β is small.
Suitable for PCM tape recorders. In the case of analog video, since the amount of information per unit time is large, it is better to increase the number of heads and use the segment method than in the case of FIG.

Further, in this embodiment, known dynamic tracing may be performed using piezoelectric elements on the head substrates 19a and 19b attached to the rotary disk 18.

The present invention is not limited to this embodiment, and various applications and modifications are possible.

Effects of the invention Since the present invention has the above-described configuration, it is difficult to put strain on the tape wound around the fixed drum. Furthermore, unlike conventional recording and reproducing devices, it is not necessary to wind the tape obliquely around a fixed drum, so there is no need for guides or other parts required for this purpose.

Furthermore, since the drive mechanism for the rotary disk with the head disposed on its outer periphery has an extremely simple structure, the number of parts can be similarly reduced, and the device can be easily miniaturized.

Furthermore, according to the loading mechanism of the present invention, the number of parts can be reduced to less than half of the conventional one. Furthermore, the assembly accuracy of the fixed drum and the loading mechanism can be improved, the assembly accuracy of the loading mechanism can be increased, and reliability can be improved. Further, the loading mechanism is a linear movement operation and does not require complicated movements, so there is no need for adjustment and the movement accuracy is extremely high.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a rotary head cylinder of a conventional rotary head diagonal scanning magnetic recording and reproducing apparatus, and FIG. 2 is an explanatory diagram showing recording on a tape. Figure 3~
7 shows an embodiment of a rotating head type oblique scanning magnetic recording/reproducing apparatus according to the present invention, FIG. 3 is a plan view, FIG. 4 is a sectional view taken along the line -- in FIG. 3, and FIG. 5 is a front view. FIG. 6 is a perspective view, and FIG. 7 is a diagram for explaining tape loading. In addition, in the symbols used in the drawings, 1
1, 12... Fixed drum, 13... Shaft core, 15...
...Substrate, 18... Rotating disk, 21a, 21b
... Head, 22 ... Gap, 23 ... Rotating shaft, 3
8...Loading member, 38a, 38b...Loading lever, 41a, 41b...Loading guide pin, 44...Magnetic tape.

Claims (1)

[Claims for Utility Model Registration] The cylindrical surface is arranged with a predetermined gap 22 above and below, is fixed to the substrate 15, and has a cylindrical surface that is substantially perpendicular to the tape 44 and in contact with the tape 44 at a predetermined wrapping angle. fixed drums 11 and 12, and a generatrix at the center of the cylindrical surface and the fixed drum 1.
A disk-shaped rotating disk 18 obliquely intersecting a plane including the axes 13 of 1 and 12 and having heads 21a and 21b on its outer periphery;
The head 21 is rotated within the gap 22 of the head 21.
In order to scan the tape 44 in contact with the cylindrical surfaces of the fixed drums 11 and 12 at points a and 21b obliquely in the longitudinal direction, it is perpendicular to the rotary disk 18 and has one end fixed to the center of the rotary disk 18. A rotating shaft 23 for transmitting power; a loading member 38 guided by the fixed drums 11 and 12 and movable in a direction perpendicular to the axis 13 of the fixed drums 11 and 12; It consists of a pair of tape guide pins 41a and 41b that are mounted at intervals and whose respective shafts are arranged substantially parallel to the axes 13 of the fixed drums 11 and 12, and the tape 44 is connected to the pair of tape guide pins. Due to the movement of 41a and 41b, the fixed drum 1
A recording and reproducing apparatus in which information is recorded and/or reproduced on the tape 44 through the heads 21a and 21b, which are wound around the cylindrical surfaces of the tapes 1 and 12.