JPS6093663A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To guarantee the safe and sure coupling of a coupling part of a recording carrier without any accident at the loading of the recording carrier by controlling properly the operation timing of a coupling part pressing means for coupling the coupling part forcively to a rotational driving part. CONSTITUTION:A magnetic sheet cassette 2 is inserted into a cassette holder 21 and the holder 21 is descended in the arrow A direction. After the passage of a prescribed time t1 from the positioning of the cassette 2 on a recording or reproducing position, an arm 23, the pressing means, is actuated for fixed period t2, a center core 3 is pressed against a spindle 8, and after the passage of the fixed period t2, the pressing operation is released. Consequently, the center core 3 is pressed against the spindle 8 only for the fixed period after the cassette 2 has reached on a prescribed position for recording or reproducing and has been stabilized at the loading of the cassette 2, i.e. after the cassette 2 has been surely loaded.

Description

[Detailed Description of the Invention] [Technical Field J] The present invention relates to a recording or reproducing device using a disk-shaped rotating record carrier such as a rotating magnetic sheet, and particularly relates to a mechanism for loading the record carrier into its rotation drive unit. be.

[Prior art]

In a recording or reproducing device using a disc-shaped rotating recording carrier, for example, a rotating magnetic sheet, a center core serving as a coupling portion is attached to the center of the magnetic sheet, and this center core is connected to a spindle, which is a rotational drive unit such as a sheet rotation motor. The rotation of the record carrier is performed by coupling the record carrier to the record carrier. In this type of equipment, if the fit between the center core and spindle is loose,
A problem arises in that the magnetic sheet does not rotate normally during a recording or reproducing operation, and on the other hand, if the fit is too tight, it becomes difficult to smoothly connect the two. Therefore, a permanent magnet is installed in the spindle of the seat rotation motor, and a soft magnetic plate is installed in the center core, and the magnetic attraction of the permanent magnet is applied to the soft magnetic plate. A device for performing this has been proposed. However, even in devices that perform this type of magnetic coupling, the center core is connected to its reference surface (for example, the spindle 8 in Figure IjpJ3, which will be described later).
Since it is difficult to ensure accurate positioning on the flange surface 8a) of the magnetic sheet, it is difficult to hold the magnetic sheet in a predetermined contact state with respect to the recording or reproducing head and to position it at a predetermined mounting point. In addition, in still image recording or reproducing devices that require strict mounting accuracy, a force of about 250 grams is required to attach the center core to the spindle, which increases the size of the magnet and hinders miniaturization and weight reduction of the device. I will do it.

Furthermore, a device has been proposed in which a mechanism is provided on the top surface of the center core to press the center core against the spindle, as in a floppy disk device. Since the spindle rotates while being pressed against the spindle, there is a disadvantage that the negative force is large and causes uneven rotation.

In view of these inconveniences, the applicant of the present application has previously proposed, for example, Japanese Patent Application No. 58-146141 regarding a device equipped with a pressing means for forcibly connecting the connecting portion of the record carrier to the rotational drive portion.
0 [Objective] The present invention relates to a further improvement of the earlier proposal made by the applicant, which eliminates the above-mentioned drawbacks of the prior art device, and which enables the coupling portion of the record carrier to be rotated by the rotation drive means. It can be attached accurately and reliably to the drive unit, and it is possible to guarantee that the contact state between the rotating record carrier and the recording or reproducing head is maintained in a predetermined state, and also to avoid heavy loads on the rotating drive unit of the record carrier. This makes it possible to reduce the size of the rotary drive unit, and also prevent any accidents from occurring when loading the record carrier by appropriately controlling the operation timing of the joint suppressing means when loading the record carrier. The aim is to provide a recording or arresting device that can guarantee a safe and reliable connection without any risks.

Note that the record carrier used in this specification 1 refers to a disc-shaped re-rotating record carrier in a magnetic, optical, or capacitive recording or reproducing method, and the record carrier rotation drive unit is a motor, etc. A drive source or a transmission part such as a spindle connected to the drive source.

[Ura 5 Akira by Examples] Hereinafter, the means provided in the present invention to achieve the above object will be exemplified and explained with reference to the illustrated embodiments.

Here, an example in which the recording carrier is a rotating magnetic sheet will be explained, and FIG. 1 will be explained about a known magnetic sheet cassette, and FIG. 2 will be explained about a conventional recording or main device.

In FIG. 1, ■ is a magnetic sheet, 2 is a cassette in which the magnetic sheet 1 is stored, and is formed of a box-shaped frame. Reference numeral 3 indicates a center core as a coupling portion fixed to the center of the magnetic seam 1-1, 4 indicates an opening into which a spindle as a rotational drive unit to be described later is inserted, and 5 indicates an opening into which a magnetic head to be described later is inserted. . The magnetic sheet 1 is stored in a cassette 2 and loaded into a recording or restraining device, for example, by means described later, and recording or reproduction is performed.

t4G Figure 2 shows the disassembly of the conventional recording or reproducing device.
This is a top view, and the dashed-dotted line shows the state in which the cassette 2 is loaded.
Since it has the same configuration and function as the member in the figure,
The explanation will be omitted.

As for the other parts, 6 is the internal chassis of the recording or collaring device, 7 is the sheet rotation motor attached to the chassis 6, and 8 is the sheet rotation motor 7 as a rotary drive unit. spindle. For the center core 3, put the magnetic 7-toe 1 on the spindle A/8 and the sheath 1.
It is something that can be attached and is made of synthetic resin. 9a is a magnetic head that is an n recording or reproducing head;
9C is an umbilical carriage that supports the head 9a and moves in the radial direction of 7-i; OLO is a soft magnetic plate fixed to the lower surface of the center core 3; 11 is a permanent magnet attached to the shoulder of the spindle 80; With these, the center core 3 and the spindle 8 are magnetically coupled and fixed. However, this device also has a drawback in that it is difficult to ensure that the magnetic seat 1 is positioned on a predetermined mounting surface.

In addition, according to another conventional example in which a mechanism for forcibly pressing the center core 3 against the spindle 8 is disposed on the upper surface of the center core 3, the seat rotation motor 7 rotates under the load from these mechanisms as described above. This increases the load and causes uneven rotation. Next, an embodiment of the present invention is shown in FIG. FIG.
The same figure (ml shows the state in which the cassette holder is raised to the position for inserting and removing the cassette, +bl in the same figure shows the state in which the cassette holder is lowered to the predetermined position for recording or playback, After the holder has been lowered, the pressing means is shown in operation, and FIG. 4 shows its control circuit.

From Fig. 3+a+ to tel, members having basically the same configuration and functions as the members in Figs. 1 and 2 are
Since they are indicated by the same reference numerals in FIG. 2 and FIG. 2, their explanation will be omitted. Reference numeral 21 denotes a cassette holder, which is an example of a movable means for positioning the cassette 2 at a predetermined position for recording or reproduction, and is movable in the directions of arrows A and B as shown in FIG. The cassette 2 is inserted into the holder 21 and loaded into a recording or reproducing position, or taken out from the holder 21 to the outside of the recording or reproducing apparatus. The cassette holder 21 is moved to the chassis 6 by a means not shown between an elevated position for inserting and ejecting a cassette (JJIJ3 figure) and a lowered position for recording or reproducing BL and LCL. and is positioned at these positions by means not shown.

Reference numeral 22 denotes a plurality of supporting parts for the cassette 2, and a plurality of them are provided on the chassis 6, but these may be constructed integrally with the 7-year 76, or may be constructed separately. Reference numeral 23 denotes an arm constituting a suppressing means, and is configured to be rotatable about a shaft 24. The shaft 24 is attached to a rising portion 21a provided on the upper surface of the cassette holder 21.

23a is a pressing end of the arm 23, which spins the center core 3 with its end 23a through the opening 21d of the cassette holder 21 by rotating the arm 23 clockwise as shown in FIG. Push it into. For this purpose, for example, two knife-shaped end portions 23a are provided, and the center core 3 is provided on the front side and the back side of the page of
Alternatively, a top plate may be provided on the top surface of the center core 3 and the end portion 23a may be pressed at the center of the large plate.

When pushing the center core 3 into the spindle 8, the flange surface 8a of the spindle 8 becomes the reference surface for positioning the center core 3 in the upper direction. For example, if the center core 3 is made of a plastic material or the like and has elasticity in its thin neck part, the excessive push-in amount when pushing the center core 3 can be reduced as shown in FIG. 3 ic). 111 can be absorbed by the occurrence of neck flexure.

A spring 25 biases the arm 23 counterclockwise, and the spring hook on the arm 23 is stretched between the bottle 23c and the spring hook on the rising portion 21b of the cassette holder 21 is stretched between the bottle 21c. Note that the engagement between the tip of the rising portion 21b and the lower end surface of the arm 23 restricts the rotation of the arm 23 in the counterclockwise direction. The pressing end 23a is 1m in FIG.
As shown in 1 and fbl, it is maintained in a state that it does not enter the internal space of the cassette holder 21.

A solenoid 26 constitutes a suppressing means together with the arm 25, and is fixed on the chassis 6.

Reference numeral 26a denotes an armature rod of the solenoid 26. When the solenoid 6 is energized, it receives a magnetic anticoal force and is caused to protrude by a predetermined amount. As shown in FIG.
It is disposed so as to closely oppose the bent portion 23d at the tail end of. 27 is a normally open type switch which is an example of a detection intermediate stage for detecting that the cassette 2 is positioned at the predetermined recording or reproducing position;
When the cassette holder 21 descends as shown in c+,
It is arranged on the chassis 6 so as to be closed by a part of the lower surface of the cassette 2.

FIG. 4 shows a control circuit for the solenoid 26.

In the figure, reference numeral 28 indicates a high level signal (FIG. 5(a)) given by closing the switch 27 for a predetermined period of time t. Specifically, when loading the cassette 2, the cassette is
29 is a high level output from the delay circuit 28 (FIG. 5). In response to b)), during a period t6, specifically, by energizing the solenoid 26, the arm 23 is operated to firmly push the center core 3 into the spindle 8 until it is regulated by the reference surface 8a of the flange portion thereof. A one-shot circuit (mono multivibrator) that outputs a signal (Fig. 5 (C)) that becomes No/I for the period required for 30
is a solenoid drive circuit that energizes the solenoid 26 for the above-mentioned period in response to a high level signal from the one-shot circuit 29; here, these circuits constitute control means for the pressing means consisting of the solenoid 26 and the arm 23. has been done.

Next, the operation of the embodiment of the MI2 recording or reproducing apparatus according to the present invention will be explained.

In the above-mentioned structure, the magnetic sheet cassette 2 is inserted into the cassette holder 21 in the raised state of the cassette boulder 21 shown in FIG. 3, 18), and the holder 21 is lowered in the direction of arrow A. To do this, for example, the cassette holder 21 is connected to the main body of the apparatus or its lid by a hinge provided on the paper side in FIG. Bye.

As shown in FIG. 3 fb), when the cassette holder 21 reaches the lowered position, it is locked in the lowered position by means shown in the diagram. At this time, the bent portion 23d at the tail end of the arm 23 is connected to the armature rod 26a of the solenoid 26.
A normally open switch 27 is closed by the end of the cassette holder 21. When the normally open switch 27 is closed, as can be understood from Figure A5 ial and fbl, the period of time 1. After that, the output of the delay circuit 28 goes high, and in response, the one-shot circuit 29 goes high.
As shown in FIG. 1et, a high level signal is output. In response to the high level output from the one-shot circuit 29, the solenoid drive circuit 30 energizes the solenoid 26. When passed through the solenoid 26, FIG. 3 1e
As shown in t, the armature rod 26a protrudes, thereby pushing up the bent portion 23d at the tail end of the arm 230, and the arm 23 rotates clockwise against the spring 25. At this time, as shown in FIG. As shown in tel, the center core 3 of the magnetic sheet 1 is pushed against the spindle 8 by the suppressing portion 23a, and brought into contact with the reference surface 8a of the flange portion of the spindle 80.

Incidentally, as shown in FIG. 3 1et, the excessive push-in is absorbed by the bending of the narrow part 23b of the arm 23, so that no large load is applied to the rotational drive part of the record carrier. .

Next, when the predetermined period t has elapsed since the output of the one-shot circuit 29 became high, the output of the one-shot circuit 29 becomes low as shown in FIG. The current to the solenoid 26 is cut off. When the power to the solenoid 26 is cut off, the armature rod 26a descends and the arm 23
is rotated counterclockwise by the spring 25 (Fig. 3+b)
The state shown in is reached, and the pressing operation against the center core 3 by the pressing end 23a of the arm 23 is released.

As explained above, in this embodiment, the circuit shown in FIG. The center core 3 is operated for a period t to suppress the center core 3 against the spindle 8, and the suppression operation is released as the fixed period t elapses.

Therefore, when loading the cassette 2, after the cassette 2 reaches a predetermined position for recording or playback and becomes stable, that is, after the cassette 2 is reliably loaded, the center core 3 is suppressed for only one period. 〇The present invention is similar to the conventional example explained in FIG. This does not preclude the use of a recording carrier loading method using magnetic attraction force.

〔effect〕

As described above, according to the present invention, as a recording or reproducing apparatus as described at the beginning, all the drawbacks of the conventional apparatus are eliminated, and the coupling part of the record carrier can be accurately and reliably attached to the rotational drive part of the rotational drive means. It is possible to ensure that the contact state between the rotating record carrier and the recording or reproducing head is maintained in a predetermined state, and there is no need to place a large load on the rotating drive section of the record carrier. This makes it possible to reduce the size of the rotary drive unit, and furthermore, by controlling the operation timing of the coupling portion suppressing means when loading the record carrier, the coupling can be carried out safely and reliably without any fear of an accident when loading the record carrier. This is extremely useful in this type of recording or reproducing apparatus.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a known magnetic sheet cassette, FIG. 2 is a sectional view of the main parts of a conventional recording or reproducing device, and M3 (al
, fbl, +c+ are cross-sectional views of main parts of the embodiment of the recording or reproducing apparatus according to the present invention, in which figure (11) shows the state in which the cassette holder is raised, and fbl shows the state in which the cassette holder is lowered. , (cl indicates the state in which the suppressing means is activated when the cassette holder is in the lowered state, and FIG. 4 shows ■- Record carrier, 2 cassettes,
3... Coupling unit, 7... Rotation drive means, 8... Rotation drive unit, 9a... Recording or reproducing head, 21... Moving means, 27. Detection means, 23. 26... Suppression means Components of 28, 29, 30 - Components of control means. Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] a moving means capable of moving the record carrier to a predetermined position for recording or reproduction; a detecting means for detecting that the record carrier is positioned at the predetermined position; It has a rotational drive part that can be coupled to the coupling part of the carrier,
a suppressing means for pressing the coupling part in order to couple the driving part to the driving TjJJJ part of the tuberculosis driving means; and a suppressing means for operating the suppressing means for a certain period of time after Rr in response to the output of the detecting means. and a control means for coupling the coupling section to the drive section.