JPS5819727A - Rotary head device - Google Patents

Abstract

PURPOSE:To improve working performance to attach a fixed drum to an attachment stand, by providing a roll bearing between the counter faces at the outer circumferences of opposite rotary member and a fixed drum and setting a fixing means to fix the fixed drum to the attachment stand at the position closer to the center of the stand than the roller bearing. CONSTITUTION:At least a roll bearing 35 is provided between the counter faces 28 at the outer circumference side of a rotary member 23 and a fixed drum 24 which are opposite to each other. Thus the size of the axial direction is reduced and made thin, and at the same time stable and highly accurate rotation is ensured. In addition, a fixing means which fixes the drum 24 to an attachment stand 51 by means of an attachment screw 54 is set at the position closer to the center of the stage 51 than the bearing 35. In such a way, the working performance is improved to attach the mechanisms around a rotary head device 45 to the stand 51.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rotary head device of a rotary head type magnetic recording/reproducing device.

In recent years, rotating head type magnetic recording and reproducing devices (V'l'19) have become more compact, and portable V'ports have begun to become popular.

Along with this, rotating head devices have been made smaller and thinner, but conventional devices are approaching their structural limits. FIG. 1 shows a conventional rotary head device. A rotating part 2 is arranged at the center of the fixed lower drum 1, and the rotating shaft 2 is rotatably attached to the fixed lower drum 1 by a bearing 3.4. The rotating upper drum 5 facing the fixed lower drum 1 is
The mounting screw 7 ((therefore, the support member 6 is attached to the rotating shaft 2 above the bearing 3 by means of a screw 8)
Fixed. As a result, the rotating upper drum 5 is rotatably arranged relative to the fixed lower drum 1. Rotating upper drum 5
At least one head base &1 () having a magnetic head 9 is attached to the magnetic head 9 by a mounting screw 11.

The outer peripheral surfaces of the rotating upper drum 5 and the fixed lower drum 1 serve as running surfaces for the magnetic tape. The supporting part (the rotating side winding 12 of the rotary transformer is attached to the rotary transformer O 6, and the rotor IJ is attached to the fixed lower drum 1 opposite to this).
is attached, and the rotating side winding 12 is connected to the magnetic head 9 to receive signals input to the magnetic head 9 or the magnetic head 9.
The signals to be output are input and output through electromagnetic coupling of a rotary transformer.

A support member 14 is attached to the lower part of the rotation 2 of the lqi receiver 4, and a rotary yoke 6 of a motor 15 is attached to the support member 14 with a screw 17. A rotary magnet 18 is fixed to the rotary yoke J6. The stator 1 faces the rotary magnet 18.
9 and stator coil 20 are fixed to the fixed lower drum l.

The fixed lower drum 1 is attached to a mounting screw 21 in the rotary head type seven eaves 11 self-recording device by means of a mounting screw 22.

In the conventional rotating head device shown in FIG. 1, because the rotating upper drum 5 is supported by the rotating IJil 112 and the rotating shaft 2 is supported by the bearing 3.4, When the spacing between the bearings 3 and 4 is reduced, the stiffness of the rotating shaft 2 due to the 1N deviation in relative position between the bearings 3 and 4 will have a small effect on the rotation locus of the magnetic head 9, and the rotation of the sieve loading will be affected. difficult to obtain and therefore
It has been extremely difficult to make the rotating head device thinner in the y-axis direction.

In addition, in Fig. 1, when tightening the mounting screw 22, a screwdriver is inserted into the gap between the motor 15 and the 1+V stand 21, but since this gap is small, the work efficiency is reduced. I felt bad.

Furthermore, there are some models in which the mounting screws 22 are tightened on the surface side of the mounting base 210, but in this case, various mechanisms are arranged around the fixed lower drum 1. The retouchability was even worse than when the mounting screw 22 was tightened.

An object of the present invention is to provide a rotary head device that solves the above-mentioned problems, can be made thinner by reducing the axial dimension, and can improve the workability of mounting on a mounting base. That's true.

In order to achieve this object, the invention provides at least one rolling bearing between opposing surfaces of the rotating member and the stationary drum near the outer periphery, and fixing means for fixing the stationary drum to the mounting base. , is characterized by being located closer to the center than the rolling bearing.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

2nd f.! -l indicates a non-explosion” example. The outer peripheral surfaces of the rotating upper drum 23 and the fixed lower drum 24 form a tape running surface, and the outer peripheral surface of the fixed lower drum 24 is coated with magnetic tape (
f) A guide door 25 is provided. A supporting portion 27 formed integrally with the rotating upper drum 23 is disposed in the internal space 26 of the fixed lower drum 24 . Two fixed ring members 29 are disposed on the inner periphery 28 of the indoor lower drum 240, which is provided on one side facing the support part 27 and scattered on the outer peripheral surface. Opposed to this, the support section 27
Two rotary ring members 31 are arranged in the 0-polar inner periphery 30. An annular groove portion 3 is provided in the fixed ring member 29 and the rotating ring member 31.
2.33 is provided, and a plurality of steel balls 34 are inserted between the annular grooves 32.33, and the fixed ring member 29 and the rotating ring member 3
1 and the steel balls 34 form a rolling bearing 35.

The rotating upper drum 23 is rotatably supported by the fixed lower drum 24 by a rolling bearing 35 . Radial and axial play in the rolling bearing 35 is eliminated by tightening by screwing the ring 36 into the support 27 and biasing the steel balls 34 of the rolling bearing 35 into the annular groove 32.33.

The fixing member 3 is attached to the fixed lower drum 24 by a mounting screw 37.
8 is fixed, and a stator coil 39 is fixed to the fixing member 38. A rotary magnet 41 fixed to a mounting member 40 is attached to a position facing the stator coil 39 by a mounting screw 42 . The rotating side winding 43 of the rotary transformer is attached to the support portion 27 of the rotating upper drum 23, and the stationary side winding 44 is attached to the fixed member 38. A head base &46 having a magnetic head 45 is attached to the rotating upper drum 23 with a mounting screw 47.
The height of the magnetic head 45 is adjusted by a height adjusting screw 48.

A lower recess 49 is provided in the fixing member 38, and a fitting hole 50 is bored in the center thereof. A bin 52 is attached to the mounting base 51.
is formed. The fitting hole 50 of the fixing member 38 is fitted into the bottle 52, and the screw 54 with J17 is tightened through the hole 53 provided in the center of the rotating upper drum 23, whereby the throat attachment fσ is set to rotation. The whole is attached to a mounting base 51.

? When the stator coil 3Y is energized from a drive circuit (not shown), a rotational force acts on the rotary magnet 41, and the rotating upper drum 23 is rotated while being supported by the rolling bearing 35. Rotating upper drum 23 and fixed lower drum 24
A magnetic tape (not shown) is wound around and runs on the outer peripheral surface of the magnetic tape, and recording or reproduction is performed by a magnetic head 45 rotating and standing on the magnetic surface of the magnetic tape at a rotational speed faster than the running speed of the magnetic tape.

Signals exchanged between the magnetic head 45 and the magnetic tape are sent to and received from the rotating side winding 43 of the rotary transformer and the stationary 4111.
The signal is input to or output from the signal processing circuit via the winding 44.

According to this embodiment, the rolling bearing 35 is connected to the fixed lower drum 2.
4, the diameter of the rolling bearing 35 becomes large, and the influence of the deviation or inclination of the relative positions of the two rolling bearings 35 on the rotation locus of the magnetic head 45 becomes small. Therefore, the distance between the two rolling bearings 350 can be reduced, and a reduction in thickness can be achieved. Furthermore, the rotational accuracy of the upper rotating drum 230 is determined by the rotational accuracy of the rolling bearing 35 and the upper rotating drum 24, and since there are no members equivalent to the rotating shaft 2 and support member 6 shown in Figure m1, the number of highly accurate parts is is reduced, and the rotational load can be increased.

Furthermore, since the diameter of the rolling bearing 35 is large, it is possible to provide a hole 53 in the center of the rotating upper drum 23, so the installation work of passing the mounting screw 54 through the hole 53 and tightening it is extremely easy. This is because the workability is the same as above. Furthermore, compared to the conventional one shown in Figure 1,
Since only one mounting screw 54 is required, workability is much improved.

・Figure 113 shows another embodiment of the book '5h. Similar to FIG. 2, parts are designated by the same reference numerals. In this embodiment, the rotating member 55 is rotatably supported by the fixed lower drum 24 by a rolling bearing 35 provided between the opposing inner circumferential surface 28 of the fixed lower drum 240 and the opposing outer circumferential surface 56 of the rotating member 550. The magnetic head 45 is attached to a rotating member 55.

The fixed upper drum 57 has a connecting member 58 and a screw 5 with jt'7.
9.60, it is fixed to the fixed lower drum 24 so as to maintain a predetermined relative positional relationship. The relative position A is adjusted by inserting a thin washer or the like between the fixed upper drum 57 or the fixed lower drum 24 and the coupling member 58.

Holes 61,62 are provided in the center of the rotating member 55 and the fixed upper drum 57, and the mounting screw 54 is tightened through these holes 61,62.

The operation and effects of this embodiment are almost the same as those of the embodiment shown in FIG.

Since the mounting angle in the circumferential direction of the entire rotary head device on the mounting base 51 is determined by the relationship with the tape running surface, the fitting hole 5
0 and the pin 52 preferably have a structure in which the circumferential mounting angle is automatically determined when they are fitted. An example of this is shown in FIG. A protrusion 52a is provided on one leg on the side of the bottle 52, and a protrusion hole 50a corresponding to the protrusion 52a is also provided in the fitting hole 50. As a result, when the fitting hole 50 fits into the bottle 52,
The circumferential mounting angle of the rotary head device with respect to the mounting base 51 is automatically determined. 63 is a washer.

FIG. 5 shows another example of the fitting hole 50 and the pin 52. A positioning bin 52b is provided on the mounting base 51 in addition to the bin 52. On the other hand, an elongated hole 50b is provided in the recess 49 of the fixing member 38 in addition to the fitting hole 50. Fitting hole 50 and pin 52
When the elongated hole 50bS and the positioning pin 52b are fitted together, the circumferential mounting angle of the rotary head device to the mounting base 51 is automatically determined, and the mounting screw 54 is tightened through the washer 63. τ” Lena, leak it.

In the implementation example shown in Fig. 8152, the rotating upper drum 23 is turned 11 times (corresponding to a member). 2E, 2nd figure or! Following the embodiment shown in Fig. 3, the fitting hole 50
, pin 52 and IIV, (=j screw 54 corresponds to the fixing means of the present invention.

In the embodiment of FIG. 2 or 3, the rolling bearing 35
Annular groove part; 32.33 is made with a separate member) Fixed ring member 2
9 and rotating wheel member 31, the fixed lower drum 240
It may be provided on the opposing inner circumferential surface 28 and the opposing outer circumferential surface 30 of the rotating upper drum 23 or the opposing outer circumferential surface 56 of the rotating member 550.

Furthermore, the rolling bearings 35 can be combined into one.

In this case, a means is required to prevent the upper rotating drum 23 or the rotating member 55 from singing in the middle. Furthermore, rollers may be used instead of the steel balls 34.

The present invention is also applicable to an intermediate drum rotation system in which the magnetic head 45 is attached to an intermediate drum rotatably disposed between the fixed upper and lower drums 57, 24.

Rolling '1ii 11th; 35 is lfl! 1. The lower tram 24 and the rotating upper drum 23 or the rotating member 55 are opposed to each other.
! The fixed lower drum 24 and the rotating upper drum 23 or the rotating member 5 are not limited to those provided between the right-handed circumferential surfaces.
It may be provided at a position closer to the outer periphery between the end faces facing 5.

The position of the 11y screw 54 is on the center of rotation of the upper rotating drum 23 or the rotating member 550, but it is limited to 1" at the center and may be located closer to the center than the roller bearing 35.The number of removed mounting screws 54 is as follows. It's not limited to one straw, it can be several strawberries.In history, the fourth
The shape of the fitting 7<50 and the pin 52 shown in the figure is not a hook shape but also a D shape.

The mounting screw 54 is not limited to a structure in which the tightening operation is performed from above the rotary head device as in the embodiment shown in FIG. It's okay. For example, a hole through which the mounting screw 54 of the mounting base 511C passes and a mating hole into which the pin fits may be provided, and the pin may be provided in the four parts 49 of the fixing member 38. Also in this case,
Since the driver for tightening the mounting screw 54 can be inserted through the hole without any hindrance, work efficiency is improved.

As explained above, according to the present invention, one rolling bearing is provided between the facing surfaces of the rotating member and the fixed drum near the outer periphery, so that the axial dimension can be reduced. By eliminating the rotating shaft, stable and efficient rotation is possible.In addition, the fixing means for fixing the fixed drum to the mounting base is located at the center 11111 from the rolling bearing. Because of this, the rotating head device α
The mounting work is not obstructed by the surrounding mechanisms or the mounting base, and the workability of mounting on the mounting base can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional rotary head device, FIG. 2 is a sectional view of one embodiment of the present invention, FIG. 3 is a sectional view of another embodiment of the present invention, and FIG. FIG. 5A is a partial cross-sectional plan view and longitudinal cross-sectional view showing an example of deformation of a fitting hole and a pin according to an embodiment of the present invention (the average is the same (other examples of deformation of a fitting hole and a pin). 23 is a partially sectional plan view and a vertical sectional view showing a single rotation upper drum, 24 is a fixed lower drum, 2
8... Opposing inner circumferential surface, 30... Opposing outer circumferential surface, 35...
・Rolling bearing, 38...Fixing member, 39...Stator coil, 41 Fist...Rotary magnet, 4511
...magnetic head, 49...recess, 50...fitting hole,
5100. Mounting base, 52--pin, 540. - Mounting screw, 55... Rotating member, 56... Opposing outer peripheral surface. Patent applicant: Canon Co., Ltd. Agent Minoru Nakamura

Claims (1)

[Claims] 1. In a rotating head device including a fixed drum, a rotating member having a magnetic head and rotatably disposed opposite to the fixed drum, and a rotation drive section for driving the rotating member, the rotating member and the fixed drum are connected to each other. A rolling bearing is provided between the facing surfaces near the outer periphery of the drum, and the fixing means for fixing the fixed drum to the mounting base is located 11!l in the center from the rolling shaft. Rotating head device.