JPS6350984A - Rotating magnetic sheet device - Google Patents

Abstract

PURPOSE:To position a magnetic head to a home position or an end position by a mechanical stopper by regulating the quantity of the movement of a gear of a gear transfer means for moving a head carriage. CONSTITUTION:When a stepping motor 34 is driven, an output shaft 50 is rotated, and a reduction gear 54 is rotated rightward, a pin 58 abuts against the right side surface of a stopper 60. This position is the home position. When the output shaft 50 of the motor 34 is rotated reversely and the reduction gear 54 is rotated leftward, the pin 58 rotates once leftward, abuts against the left side surface of the stopper 60 and cannot be moved. This position is the end position of the head carriage 38. In this case, since the stopper 60 regulates the reduction gear 54, a lead screw 36 or the like is not damaged. Thereby, the magnetic head can be effectively positioned to the home position or the end position by the mechanical stopper.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotating magnetic sheet device, and particularly relates to a rotating magnetic sheet device used as a magnetic recording device or a reproducing device in an electronic still camera, etc. [Background of the Invention] Recently , by combining an imaging device such as a solid-state image sensor or an image pickup tube with a recording device that uses a magnetic sheet, which is inexpensive and has a relatively large storage capacity, as a recording medium to take a still image of the subject purely electronically and rotates the magnetic sheet. An electronic still camera system has been developed that records images on the computer and reproduces them 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, etc. is rotatably housed inside the magnetic sheet, and this magnetic sheet bank is used by being attached to a rotating magnetic sheet device incorporated in an electronic camera.

In such a rotating magnetic sheet device, the magnetic head is moved by driving a head carriage to which the magnetic head is attached in advance. The drive mechanism for the head carriage is configured to transmit rotational force from a stepping motor to the head carriage as linear motion via a gear reduction mechanism, a lead screw, and the like.

To record or reproduce an image, the magnetic head is brought into contact with the magnetic sheet housed in the magnetic sheet pack, and while rotating the magnetic sheet, the magnetic head is moved from the home position W (the starting point of the moving distance of the magnetic head) to the end. The magnetic head is moved to the position (the end position of the moving distance of the magnetic head).

Conventionally, the home position and end position were detected by installing a detection switch at the stroke end of the head carriage and using an electrical signal from this detection switch, but with this method, noise etc. were mixed into the electrical signal and the stroke End detection was inaccurate. If the home position and end position are inaccurately detected, there is a risk of damaging the feed mechanism such as the lead screw. Furthermore, if a mechanical stopper is used, the above-mentioned disadvantages can be solved, but conventional mechanical stoppers include a method of stopping the movement of the head carriage by providing a stopper that restricts the movement of the head carriage or lead screw.
With this method, the load is placed on the lead screw itself,
There was a risk of damaging the lead screw.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotating magnetic sheet device that can reliably position a magnetic head at a home position or an end position using a mechanical stopper.

[Summary of the invention]

In order to achieve the above object, the present invention provides a rotating magnetic sheet device that performs magnetic recording or reproduction on a magnetic sheet rotatably housed in a magnetic sheet pack, which is equipped with a magnetic head and which is guided by a guide member. A head carriage that is movable in the radial direction of the magnetic sheet, a lead screw that engages with the head carriage and rotates to move the head carriage, and a lead screw that connects the output shaft of a rotational drive source and the lead screw, and a It is characterized by comprising a gear transmission means that transmits rotational force to the lead screw, and a regulating member that regulates the amount of movement of the gear constituting the gear transmission means and regulates the movement stroke of the head carriage.

〔Example〕

Preferred embodiments of the rotating magnetic sheet device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 6 shows a plan view of the magnetic sheet pack 10 used in a magnetic recording or reproducing device such as an electronic camera, and FIG. 7 is a sectional view taken along line A--A in FIG. 6. As shown in FIG. 6, the magnetic sheet bank 10 has a substantially rectangular shape, and a magnetic sheet 12 on which still image information and the like are recorded is rotatably housed inside the bank. A center core 14 as a reinforcing member is provided in the center of the magnetic sheet 12, and this center core 14 is exposed to the outside through a circular opening 16 of the magnetic sheet pack 10. The magnetic sheet pack 10 has a window 18 in which a magnetic head, which will be described later, is located.
is opened, and this magnetic head window 18 is opened and closed by a slidable shutter 20. That is, the shutter 20
Before the magnetic sheet pack 10 is inserted into a packet to be described later, the window 18 is closed to prevent dust from adhering to the magnetic sheet 12, and when the magnetic sheet bank 10 is inserted into the packet, the shutter 20 is closed. The head window 18 is moved downward in FIG. 1 to open the head window 18, and recording and reproduction on the magnetic sheet 12 becomes possible.

1 and 2 show the structure of a rotating magnetic sheet device according to a first embodiment of the present invention, and FIG. 1 is a perspective view of the entire structure;
FIG. 2 is a plan view of the drive mechanism. The rotating magnetic sheet device is composed of a main body 24, a packet 26, and an upper lid 28. First, the internal structure of the device main body 24 will be explained. Inside the device main body 24 is a motor 30 for driving a magnetic sheet.
The drive shaft 32 of this motor 30 is connected to the center hole 15 of the center core 14 of the magnetic sheet pack 0 shown in FIG.
and rotate the magnetic sheet 12 at a predetermined number of rotations within the magnetic sheet pack 10. Further, in FIG. 2, 34 is a motor for feeding the magnetic head, 36 is a lead screw connected to the output shaft 50 of this motor 34 via a gear transmission means 51, and 38 is engaged with or screwed into this lead screw 36. A head carriage 42, which is guided and moved by guide shafts 40, 40, is a magnetic head mounted on the Herad carriage 38.

As shown in FIG. 2, power is transmitted to the head carriage 38 by teeth 37 meshing with the threaded portion of the lead screw 36, but the present invention is not limited to this.
A nut may be integrally formed on the nut, and the threaded portion of the lead screw 36 may be screwed into this nut. motor 34
When the head carriage 3 is rotated at a predetermined number of rotations, the head carriage 3
8 moves in the axial direction of the guide shaft 40 every predetermined pinch as the lead screw 36 rotates. As a result, the magnetic head 42 moves in the radial direction of the magnetic sheet 12, that is, in the direction of the arrow in the figure, and can record or reproduce still image information on the magnetic sheet 12 track by track.

Next, the gear transmission mechanism 51 connecting the stepping motor 34 and the lead screw 36 will be explained with reference to FIG. A gear 5 is attached to the output shaft 50 of the stepping motor 34.
2 is provided, and this gear 52 meshes with a reduction gear 54. A gear 56 is also provided at the end of the lead screw 36, and this gear 56 meshes with the reduction gear 54 to form a reduction mechanism. Therefore, the rotational force from the stepping motor 34 is transmitted to the lead screw 36 via the gear 52, 54, 5G.

Next, the positioning mechanism for the home position and end position will be explained. A pin 58 is attached to the side of the reduction gear 54.
is provided protrudingly, and a stopper 60 is provided on the device main body 24 side.
is provided. The reduction gear 54 is set in advance so that one rotation thereof corresponds to the stroke of the head carriage 38. Therefore, the position where the gear 54 rotates left or right and contacts the stopper 60 is the home position of the magnetic head 42. position or end position position.

In FIG. 1, crank-shaped bent leaf springs 80.80 are provided at predetermined intervals on the back surface of the upper lid 28, and a regulating plate holder 82 is attached to the leaf springs 80.80.

The regulating plate holder 82 has a length corresponding to substantially the entire width of the main body 82, and the regulating plate holder 84 is further provided with a regulating plate 84 at a position facing the magnetic head 42 when the top cover 28 is closed. The regulating plate 84 is arranged in the direction of movement of the magnetic head 42: $8
6 is formed.

Next, the operation of the rotating magnetic sheet device according to the first embodiment configured as described above will be explained. First, to load the magnetic sheet pack, the magnetic sheet pack 10 is inserted into the packet 26 with the top lid 28 shown in FIG. 1 in an open state.

Next, in this state, when the upper M28 is pushed down toward the main body 24, the center core 14 is attached to the drive shaft 32, and the magnetic sheet 12 becomes rotatable by the drive shaft 32.

When the Stellar Pig motor 34 is driven, the output shaft 50 rotates, and the reduction gear 54 rotates clockwise in FIG. 3, for example, the pin 58 comes into contact with the right side surface of the stopper 60, and this position is the home position. Further, when the output shaft 50 of the stepping motor 34 rotates in the reverse direction and the reduction gear 54 rotates to the left, the pin 50 rotates counterclockwise once and comes into contact with the left side surface of the stopper 60, becoming immovable. This position is the head carriage 38
is the end position. In this case, since the stopper 60 restricts the reduction gear 54, no load is applied from the reduction gear 54 to the lower transmission mechanism, that is, the gear 56, the lead screw 36, etc., and therefore there is no possibility of damaging the lead screw 36, etc. do not have.

4 and 5 show the structure of a second embodiment of the present invention. In the second embodiment, a rack is used instead of the reduction gear 54 of the first embodiment to determine the home position and end position. That is, the gear 52 provided on the output shaft of the motor 34 meshes with the gear 62 provided at the end of the lead screw 36, thereby transmitting rotational force to the lead screw 36. On the other hand, a rack 64 is engaged with the gear 52, and the rack 64 is guided by a groove 68 formed in a support plate 66 and is movable in the left-right direction. That is, three pins 70, 70, 70 are provided protruding from the side surface of the rack 64, and these pins 70 are loosely fitted into guide grooves 68 formed in the support plate 66. Further, stopper pieces 72 and 74 formed by bending the support plate 66 are formed on the sides of the rack 64.

In the second embodiment configured as described above, when the output shaft 50 of the stamping motor 34 rotates, the gear 52.6
The lead screw 36 rotates via the screw 2 and moves the head carriage 38.

Also, since the rack 64 is meshing with the gear 52 at the same time,
As a result, the rack 64 moves in the left-right direction due to the rotation of the output shaft 50. In this case, since stoppers 72 and 74 are bent and formed on the sides of the rack 64, the rack 64
For example, when the output shaft 52 comes into contact with the home position stopper 72, the rotation of the output shaft 52 is restricted, and the head carriage 38
will stop at the home position. Further, when the stopper 74 is used for regulating the end position, the rotation of the output shaft 50 is regulated by the rack 64 coming into contact with the stopper 74, thereby stopping the head carriage 38 at the end position.

In the second embodiment as well, since the rack 64 that engages with the gear 52 of the output shaft 50 is restricted, the regulating force is not transmitted to the lead screw 36 or the like, and therefore, as in the second embodiment, the rack 64 that engages with the gear 52 of the output shaft 50 is restricted. 36 will not be damaged.

〔Effect of the invention〕

As explained above, according to the rotating magnetic sheet device according to the present invention, the amount of rotation of the gear constituting the gear transmission means that connects the rotational drive source and the screw that drives the head carriage is regulated, and the magnetic head Since the home position and end position of
The home position and end position can be set with high precision, and the lead screw etc. will not be damaged.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall structure of a rotating magnetic sheet device according to a first embodiment of the present invention, FIG. 2 is a plan view of main parts of the rotating magnetic sheet device, and FIG. 3 is a plan view of this embodiment. Figure 4 is a front view of the second embodiment, Figure 5 is a plan view of the second embodiment, and Figure 6 is a front view of the second embodiment.
The figure is a plan view of a magnetic sheet pack used in a rotating magnetic sheet device, and FIG. 7 is a sectional view of the magnetic sheet pack taken along line A--A in FIG. 6. 10... Magnetic sheet pack, 12... Magnetic sheet, 24... Main body of rotating magnetic sheet device, 28.
...Top lid, 32... Drive shaft, 34... Spinning motor, 36... Lead screw, 38
...Head carriage, 42...Magnetic head,
51... Gear transmission means, 58... Pin, 60...
...stopper.

Claims (1)

[Claims] (1) A rotating magnetic sheet device that performs magnetic recording or reproduction on a magnetic sheet rotatably housed in a magnetic sheet pack includes a magnetic head and is guided by a guide member to move in the radial direction of the magnetic sheet. a lead screw that moves the head carriage by meshing with the head carriage and rotating; and a lead screw that connects the output shaft of a rotational drive source and the lead screw to transmit rotational force from the rotational drive source to the lead screw. A rotating magnetic sheet device comprising: a gear transmission means; and a regulating member that regulates the amount of movement of the gear constituting the gear transmission means and regulates the movement stroke of a head carriage.