JPS6126972A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the accurate drive of a counter display part in response to the feed of a magnetic head with a simple structure, by incorporating an intermittent feed means for counter shaft and a switch for stop of a motive power source to a series of a motive power transmission means. CONSTITUTION:A magnetic head 30 is driven by a carriage drive member 34 provided to a gear train 36. The 7th gear 96 of the gear train 36 has a counter shaft which interlocks a counter display part of a sheet pack 10. While the 4th gear 82 contains a cam 80 in a contact enable state of feed intermittently said counter shaft and also to stop the drive of a DC motor 38. When a motor 38 is revolved, the gear 82 is sent by a pitch by a cam 80. When the teeth of the gear 82 ride on the outer circumference of the cam 80, a switch 90 is closed to stop the drive of the motor 38. This action is repeated for a slight shift of the head 30 and at the same time the counter shaft is also revolved intermittently. Thus a counter is displayed in response to the feed of the head 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording and reproducing device, and particularly to a magnetic recording and reproducing device used as a magnetic recording device or a reproducing device such as an electronic still camera.

[Background of the invention]

Recently, imaging devices such as solid-state image sensors and image pickup tubes are combined with recording devices that use magnetic sheets, which are inexpensive and have a relatively large storage capacity, to take purely electronic still photographs of subjects using rotating magnetic sheets. An electronic still camera system has been developed that records images on the screen and plays them back using a separate television system or printer, and is attracting a lot of attention.

The magnetic sheets used in such systems are usually in the form of magnetic sheet packs. A magnetic sheet for magnetically recording still image information and the like is rotatably housed inside the magnetic sheet, and this magnetic seat back is used by being attached to a magnetic recording/reproducing device built into an electronic camera.

In an image recording or reproducing system using such a magnetic sheet, a magnetic sheet with a diameter of about 50 mm is used, and this magnetic sheet has tracks ranging from 1 track to 52 tracks from the outer circumferential side to the inner circumferential side. A recorded pattern is formed. In such a magnetic recording/reproducing device, the feed pinch of the magnetic head is about 100 μm, which is much smaller than the feed pinch of a normal floppy disk, and therefore the magnetic head must be moved with extremely high precision.

Incidentally, electronic cameras and the like require a counter display section to clearly indicate the number of recorded tracks of the magnetic sheet in the magnetic sheet pack. That is, when the first track is recorded, the counter display section indicates No. 1, when the second track is recorded, it indicates No. 92, and from then on, the counter display section displays numbers up to the 52nd track according to the position of the magnetic head. . Therefore, it is necessary to drive the counter display section in conjunction with the feeding of the magnetic head. The drive mechanism for such a counter display has a complicated structure because it must be driven in accurate correspondence with the magnetic head, and a counter display drive mechanism with a simple structure is desired.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to propose a magnetic recording/reproducing device that has a simple structure and is capable of driving a counter display section in accurate correspondence with the feeding of a magnetic head. .

[Summary of the invention]

In order to achieve the above object, the present invention provides a rotary drive source, a counter shaft that engages with a counter display section indicating the number of recorded tracks of a magnetic sheet pack, and a power transmission means that connects the rotary drive source and the counter shaft. It is characterized by comprising an intermittent feeding means included in the countershaft for intermittently feeding the countershaft, and a switch means for detecting the intermittent feeding of the countershaft and sending a stop signal to the rotation drive source.

[Embodiments] Preferred embodiments of the magnetic recording and reproducing apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a plan view of a magnetic sheet pack used in a magnetic recording or reproducing device such as an electronic camera, and FIG. 2 is a sectional view taken along the line 1--2 in FIG. As shown in FIG. 1, the magnetic sheet pack 10 has a substantially rectangular shape,
Magnetic sheet 12 on which still image information etc. are recorded
is rotatably stored. Fifty-two annular recording tracks are formed on this magnetic sheet 12 from the outer circumferential side to the inner circumferential side. A center core 14 as a reinforcing member is provided in the center of the magnetic sheet 12, and a center hole 15 is formed in the center core 14. This center core 1
4 is exposed to the outside from a circular opening 16 of the magnetic sheet pack 10 and is pivotally supported by the opening 16. A window 18 in which a magnetic head, which will be described later, is located is opened in the magnetic sheet pack 10, and this window 18 for the magnetic head is opened and closed by a slideable shutter 20.

That is, the shutter 20 closes the window 18 to prevent dust from adhering to the magnetic sheet 12 before the magnetic sheet pack 10 is inserted into the magnetic recording/reproducing apparatus. Shutter 20 when
moves downward as shown in FIG. 1 to open the head window 18, allowing recording and reproduction on the magnetic sheet 12. Reference numeral 22 denotes a counter display section for the number of recorded tracks, which rotates in conjunction with the feeding operation of the magnetic head provided in the magnetic recording/reproducing device, and displays the number of recorded tracks. A play hole 22A is formed in the counter display section 22. FIG. 3 shows a plan view of the magnetic recording/reproducing apparatus. A drive motor 26 for the magnetic sheet 12 is disposed approximately in the center of the main body 24 of the magnetic recording/reproducing device, and the magnetic sheet pack 10 is connected to the drive shaft 28 of the motor 26 and the center hole 15 of the magnetic sheet 12.
are arranged in correspondence with That is, when the magnetic sheet pack 10 is inserted into the magnetic recording/reproducing device, the drive shaft 28 of the motor 26
is fitted into the center hole 15 of the magnetic sheet 12, and the magnetic sheet 12 can be rotated at high speed.

In FIG. 3, 30 is a magnetic head for recording or reproducing information on the magnetic sheet 12, 32 is a hend carriage body to which this magnetic head 30 is attached, 34 is a head carriage drive member for moving this head carriage 32, and 36 is a hend carriage body. This is a gear train that constitutes a power transmission mechanism between the drive member 34 and the DC motor 38. First, the structure of the 7-position carriage 32 will be explained. The head carriage 32 has an abbreviated shape and moves while being guided by a long axis 40 and a short axis 42 to move the magnetic head 30 in the radial direction of the magnetic sheet 12. Move back and forth. The long axis 40 is
The short shaft 42 is inserted into the guide hole 44 of the head carriage 32, and the short shaft 42 abuts against a step 46 formed at the end of the head carriage 32, and the plate spring 48 holds the head carriage 3.
The end portion of 2 is aligned along the short axis 42. Further, a coil spring 54 is disposed between the spring receiving surface 50 of the head carriage 32 and the support base 52 of the long shaft 40, and the head carriage 32 is directed to the right side in FIG. It is energized by

The head carriage driving member 34 is composed of a pulley 56 and a fan-shaped gear 58 integrally attached to the upper surface of the pulley 56. A belt 60 is wound α around the boot IJ56, and both ends of the belt 60 are fixed to the end surface 64 of the head carriage 32 by screws 62 and 62, and the center portion is also fixed to the pulley 56 by a screw 66. Therefore, when the head carriage drive member 34 rotates, the head carriage 32 reciprocates via the belt 60.

Next, the structure of the gear train 36 that connects the DC motor 38 and the head carriage drive member 34 will be explained. The worm 68 provided on the drive shaft 39 of the DC motor 38 meshes with the first gear (worm wheel) 70.
Furthermore, this first gear 70 meshes with a second gear 72.

A swing lever 76 is supported on the center shaft 74 of the second gear 72 so as to be swingable about the center shaft 74 . Swing lever 7
A third gear 78 that meshes with the gear 72 is rotatably supported at the tip of the third gear 6 . Furthermore, a cam 80 is provided coaxially with this third gear 78, and this cam 80 intermittently feeds a fourth gear 82. That is, as shown in FIG. 4, a triangular notch 84 is formed in the cam 80, and the tooth 82A of the fourth gear 82 has a triangular tooth profile corresponding to the notch 84 as shown in the figure. When the cam 80 rotates, the notches 84 fit into the teeth 82A of the gear 82, and when the cam 80 rotates in this state, the fourth gear 82 rotates, and the counter shaft, which will be described later, rotates in response to the feeding movement of the magnetic head. become.

The cam 80 rotates the fourth gear 82 while the teeth of the fourth gear 82 are fitted into the notches 84, or when the teeth of the fourth gear 82 come out of the notches 84 as shown in FIG.
The circumferential portion 85 rotates idly relative to the fourth gear 82, and the fourth gear 82 does not rotate. As a result, the fourth gear 82 is intermittently fed.

In this embodiment, when the cam 80 rotates once and the fourth gear 82 rotates by one tooth, the X counter shaft is rotated by an amount that indicates that the magnetic throat 30 has moved one track.

On the other hand, a leaf spring 86 is brought into contact with the opposite side of the cam 80 from the fourth gear 82, and this leaf spring 86 urges the cam 80 to come into contact with the fourth gear 82. Further, this leaf spring 86 constitutes a movable side contact, and forms a pair with a fixed side contact 88 to constitute a switch 90. That is, the fourth gear 82 is inserted into the notch 84 of the cam 80.
While the teeth are engaged, the cam 80 is biased to the right by the leaf spring 86, so that the movable contact 86 and the fixed contact 88 are out of contact (FIG. 4). As described above, the teeth of the fourth gear 82 of the cam 80 come off the notch 84,
When the outer peripheral portion 85 comes into contact with the teeth of the fourth gear 82, the swing lever 76 and the cam 80 move to the left in FIG. contacts the fixed side contact 88, and the switch 90 is closed (FIG. 5). As a result, a stop signal is sent from the switch 90 to the DC motor 38, and the feeding of the magnetic head 30 and the counter shaft is stopped.

A fifth gear 92 is provided coaxially with the fourth gear 82, and this fifth gear 92 meshes with a sixth gear 94. Furthermore, the sixth
A seventh gear 96 is provided coaxially with the gear 94, and this seventh gear 96 meshes with an eighth gear 98. 6th gear 94
, a counter shaft, which will be described later, is provided coaxially with the seventh gear 96. Further, a ninth gear 100 is provided coaxially with the eighth gear 98, and the ninth gear 100 meshes with the fan-shaped gear 58 of the head carriage drive member 34. In this way, the DC motor 38 is connected to the head carriage drive member 34.

Next, the structure of the counter shaft will be explained. As shown in FIG. 6, a counter inner shaft 104 is disposed within the sixth gear 94 and the seventh gear 96. The counter inner shaft 10 is mounted on the main plate 102.
4 is supported slidably in the vertical direction, and this counter inner shaft 1
04 is a stopper flange 1 which is urged upward in FIG. 5 by a spring 106 and is integral with the counter inner shaft 104.
08 is in contact with the base plate 102. An engaging piece 110 is provided on the upper part of the counter inner shaft 104 to protrude laterally, and this engaging piece 110 fits into the play hole 22A of the counter display section 22 of the magnetic sheet pack 10 to correspond to the feeding of the magnetic head 30. Then, the counter display section 22 is rotated to display the recorded tracks. A counter outer shaft 112 is provided outside the counter inner shaft 104, and the counter inner shaft 104 is housed in the counter outer shaft 112 so as to be slidable in the axial direction. Holding piece 1
1"0 is located within the vertical a114 of the counter outer shaft 112,
As a result, the counter inner shaft 104 rotates integrally with the counter outer shaft 112. The counter outer shaft 112 is fixed to the sixth gear 94 and seventh gear 96 sides by screws 113,
Rotates together with these gears.

The operation of the embodiment according to the present invention constructed as described above is as follows.

First, when the DC motor 38 rotates, the worm 68 and the first
The rotational force is transmitted to the fourth gear 82 via the gear 70, the second gear 72, the third gear 78, and the cam 80. The teeth of the fourth gear 82 fit into the notches 84 of the cam 80 and are fed by one pinch, and the teeth of the fourth gear 82 fit into the notches 84 of the cam 80 .
6, the switch 90 closes and the DC motor 3
8 is stopped. By repeating this operation, the magnetic head 30 attached to the
is minutely fed one track at a time in the XX direction, and at the same time, the counter shaft composed of the counter inner shaft 104 and the counter outer shaft 112 is also intermittently rotated. As a result, the magnetic head 30 and the counter shaft are intermittently finely fed.

In the embodiment described above, the cam 80 is formed with one notch 84, but the invention is not limited to this; for example, if two notches 84 and 84 are formed in the cam 80 as shown in FIG. The throat 30 and the counter shaft can be intermittently fed at twice the speed.

In the embodiment described above, the DC motor 38 is used for both feeding the magnetic head 30 and feeding the counter shaft. A source may also be used. That is, the magnetic head 30 may be provided with a separate Φ motor for feeding, and the DC motor 38 may be used exclusively for intermittent feeding of the counter shaft. Further, the switch that detects the swinging of the cam 80 and stops the DC motor 38 is not limited to a switch with a mechanical contact, but may be a non-contact switch such as a photo ink club, for example, to detect the swinging of the cam 80. It is also possible to detect this and stop the DC motor 38.

〔Effect of the invention〕

As explained above, according to the magnetic recording and reproducing device according to the present invention, an intermittent feeding member is provided in the power transmission means that connects the rotational drive source and the counter shaft, and furthermore, the intermittent feeding of the counter shaft is detected and the rotational drive source is connected to the rotational drive source. Since a switch means for sending a stop signal is provided, the magnetic head or counter shaft can be driven intermittently with high precision even if a C motor is used, which is simple and inexpensive.

[Brief explanation of drawings]

Fig. 1 is a plan view of the magnetic sheet pack used in this embodiment, Fig. 2 is a sectional view of the magnetic sheet pack taken along the line ■-■ in Fig. 1, and Fig. 3 is the overall structure of the magnetic recording/reproducing device. 4 and 5 are plan views showing the structure of the main parts of this embodiment, FIG. 6 is a sectional view showing the structure of the counter shaft, and FIG. 7 is another structure according to the present invention. FIG. DESCRIPTION OF SYMBOLS 10... Magnetic sort back, 12... Magnetic sheet, 14... Center core, 24... Main body of magnetic recording/reproducing device, 30... Magnetic head, 32...
・Head carrier, 34...Head carrier nozzle drive member, 36...Gear train, 38.
...DC motor, 80...Cam, 84...Depth of cut, 90...No, Inochi, 104...Counter inner shaft, 112...Counter outer shaft.

Claims (2)

[Claims] (1) In a magnetic recording/reproducing device equipped with a magnetic head that moves in a radial direction relative to a magnetic sheet housed in a magnetic sheet pack to perform recording or reproduction on the magnetic sheet, a rotational drive source and a magnetic sheet are provided. a counter shaft that engages with a counter display section indicating the number of recorded tracks of the pack; an intermittent feeding means that is included in the power transmission means that connects the rotational drive source and the counter shaft; and an intermittent feeding means that feeds the counter shaft intermittently; A magnetic recording and reproducing device comprising switch means for detecting intermittent feeding and sending a stop signal to a rotational drive source. (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the counter shaft and the intermittent feeding means are arranged in a gear train for driving a magnetic head.