JPH09185875A - Information recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a device, to accelerate operating speed and to improve reliability. SOLUTION: A placing surface 22a placing an optical card, a reference surface 22b for setting one side edge position of the optical card and the reference surface 22c are provided on an upper surface of an placing plate 22. Leaf springs 31, 32 energizing the optical card to the reference surface 22b and reference plates 33, 34 setting the upper surface position of the optical card are provided on the other side edge of the placing plate 22. An energizing means 40 rotation energized by a coil spring and energizing the lower surface of the optical card to the reference surface 22b and the reference plates 33, 34 through a penetration hole is provided on the lower surface of the placing plate 22. This device is constituted so that a frequency of an ultrasonic motor 28 is switched to a lower frequency by signals due to interference between shield plates 35, 36 and photointerrupters 46, 47. When the placing baseplate 22 is moved to a card loading/unloading position, a pin 44 is abutted on a projection piece 45, and the frequency of the ultrasonic motor 28 is switched to the lower frequency by the signals of the photointerrupters 46, 47, and maximum torque is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for mounting a card-shaped information recording medium on a mounting table and recording or reproducing information on the information recording medium while moving the mounting table and the optical head relatively. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, magnetic systems and optical systems have been known as this type of information recording / reproducing apparatus, and in recent years, optical systems have been receiving attention. The optical system records or reproduces information by using a light beam, and is intended for a CD that rotates a disc-shaped information recording medium, a laser disc, an optical card that reciprocates a card-shaped information recording medium, an optical tape, and the like. Optical cards are often used because of their excellent storability and portability.

Tracks are formed on the optical card at intervals of several μm, and information is recorded and reproduced by forming spots of several μm between these tracks. At this time, the mounting table on which the optical card is mounted and the optical head are driven in a direction orthogonal to each other, and the light beam is irradiated onto the optical card while following the track in parallel with the track. Furthermore, in recent years, a separate type optical head has been developed in which the optical head is separated into a fixed part and a movable part, and the carriage itself is lightened. In an apparatus using this separate type optical head, for example, as shown in FIG. 7, the optical head 1 located on the optical card C is linearly reciprocally driven in the direction X along the information track T of the optical card C and mounted. The table 2 is adapted to be driven in a direction Y which intersects the track T at a right angle.

Here, when the parallel direction between the moving direction X of the optical head 1 and the track T is largely deviated, the focus of the light beam cannot follow the track T, and when the optical card C is largely warped, The angle of reflection of the beam on the surface of the recording medium changes and the optical axis of the light beam shifts, making it impossible to accurately record and reproduce information. Therefore, the mounting table 2 positions the track T of the optical card C in parallel with the moving direction X of the optical head 1 and holds the optical card C in a plane.

A conventional information recording / reproducing apparatus is shown in a perspective view of FIG.
FIG. 9 is a front view of the mounting table 2 shown in FIG.
It is configured as shown in the cross-sectional view of FIG. 9 taken along the line AA of FIG. That is, the mounting table 2 is movably supported on a base (not shown) by the guide shafts 3 and 4, and is driven in the direction Y by the ultrasonic motor 5. An optical card C is mounted on the upper surface of the mounting table 2, and one side edge of the mounted optical card C has leaf springs 6 and 7 provided on the other side edge side.
Is urged toward the reference surface 2b, and the position of one side edge of the optical card C is settled. Further, the front edge of the optical card C is pressed against the reference surface 2c by a card insertion / removal means (not shown), and the front edge position of the optical card C is set. And
The lower surface of the side edge of the optical card C is pressed by the biasing means 10 against the reference plates 8 and 9 provided on the upper side edge of the mounting table 2, and the position of the upper surface of the optical card C is settled. At this time, the front edge of the optical card C is pushed into the gap having the thickness δ between the reference protrusion 2d and the reference plates 8 and 9, and the upper surface position of the front end of the optical card C is settled. Further, the positions of the upper surface of the vicinity of the central portion of the side edge of the optical card C and the upper surface of the rear end portion are urged and settled by the urging means 10 arranged at two places.

Here, each urging means 10 has contact and separation parts 11 and 12 which contact and separate from the lower surface of the optical card C, and these contact and separation parts 1.
A leaf spring 13 that connects the first and the second members 12 is provided. The leaf spring 13 has an arcuate shape in which both ends are curved downward, and the central portion thereof is fixed to the lower surface of the mounting table 2 by a fixing screw 14. Pins 15 and 16 are horizontally projected on the side surfaces of the contacting / separating portions 11 and 12, one pin 15 is directed inward, and the other pin 16 is directed outward.

Further, hooks 17 and 18 that act on the pins 15 and 16 when the mounting table 2 moves to the card insertion / removal position are provided on the base. The hooks 17 and 18 are provided with inclined surfaces 17a and 18a which come into contact with the pins 15 and 16, and the pins 15 and 16 slide on the inclined surfaces 17a and 18a so that the contact / separation portions 11 and 12 are moved to the optical card C. It is designed to be separated from. Therefore, when the optical card C is inserted into or removed from the mounting table 2 by a card insertion / removal unit (not shown),
The frictional force between the optical card C and the mounting table 2 is reduced, and the load on the card insertion / removal means is reduced. When the mounting table 2 leaves the card insertion / removal position, the hooks 17 and 18 release the contacting / separating portions 11 and 12 of the biasing means 10, and the contacting / separating portions 11 and 12 cause the leaf spring 1 to move.
The optical card C is biased by the biasing force of 3.

Since the optical card C is urged against the reference plates 8 and 9 at three points on one side, interference between the urging means 10 and the guide shafts 3 and 4 is prevented, and the height of the device is increased. It is kept low.

[0009]

The ultrasonic motor 5 used in the above-mentioned conventional example is for obtaining a driving force by generating a traveling wave on the stator surface by inputting a sinusoidal voltage. Frequency f as shown in the graph of FIG.
And f-N characteristics depending on the rotation speed N. The rotation speed N has a maximum at the resonance frequency fp, and has a gentle downward curve on the higher frequency side than the resonance frequency fp. The mounting table 2 is driven in this region, and the frequency of the ultrasonic motor 5 is the speed at which the seeking operation is performed on the mounting table 2, that is, the specified speed (rotation speed N).
It is fixed at frequency f1 corresponding to 1).

The load torque of the ultrasonic motor 5 is shown in FIG.
As shown in T0 → T1 → T2 of 2, the characteristic curve becomes relatively smaller, so that the torque T1 has the maximum value at the frequency f1. Therefore, as shown in FIG. 12, the load torque Tf
Is a constant torque until reaching the home position P1 which is the initial position
It is set to TO and increases toward the maximum torque T1 as it approaches the card insertion / removal position P2.

Therefore, the following problems occur in the above embodiment. (1) The ultrasonic motor 5 drives the mounting table 2 at a constant torque T0
In addition to the load torque Tf of 1, the load torque Tf less than or equal to the maximum torque T1 against the biasing means 10 is required. On the other hand, in order to improve the flatness of the optical card C, it is necessary to increase the urging force of the leaf spring 13. On the other hand, in order to cancel the increased urging force of the leaf spring 13, the maximum force of the ultrasonic motor 5 is increased. It becomes necessary to increase the torque T1.

(2) The inclined surfaces 17a, 1 of the hooks 17, 18
By reducing the inclination angle of 8a, the load torque Tf of the ultrasonic motor 5 can be suppressed within the maximum torque T1, but the stroke of the inclined surfaces 17a, 18a, that is, the inclined surface 17a,
The sliding range of the pins 15 and 16 sliding on the 18a is widened, the size of the apparatus is increased, and the operation of the mounting table 2 is slowed down. Therefore, in order to realize high speed, the leaf spring 13
It is necessary to suppress the urging force of.

An object of the present invention is to provide an information recording / reproducing apparatus which can solve the above-mentioned problems, improve reliability, and realize miniaturization and high speed operation.

[0014]

An information recording / reproducing apparatus according to the present invention for solving the above-mentioned problems has a first reference surface for stabilizing the upper surface position of a card-shaped information recording medium, and an information recording / reproducing apparatus for the information recording medium. An information recording / reproducing apparatus for recording / reproducing information on / from the information recording medium by moving a mounting table having a second reference surface for setting a side edge position relative to an optical head,
The urging means provided on the mounting table for urging the information recording medium to at least the first reference surface; the driving means for driving the mounting table; the detecting means for detecting the position of the mounting table; It is characterized in that it is provided with a releasing means for releasing the biasing force of the biasing means, and an increasing means for increasing the driving force of the driving means in response to a signal from the detecting means.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a perspective view of the embodiment, in which a mounting table 22 is arranged below an optical head 21 which is movably supported in a direction X, and the mounting table 22 includes two guides installed on a base (not shown). It is supported by shafts 23 and 24 so as to be movable in a direction Y perpendicular to the direction X.
The optical head 21 is linearly reciprocally driven by a drive source (not shown) such as a voice coil motor to emit laser light.

FIG. 2 is a front view of the mounting table 22 in a card insertion / removal position, and FIG. 3 is a sectional view taken along the line BB of FIG. 2, showing one of the guide shafts 23, 24. Axis 23
A bearing 25 is interposed between the mounting table 22 and the mounting table 22, and a sliding member 26 is interposed between the other guide shaft 24 and the mounting table 22. Ultrasonic motor 2 with pulley 27 on the base
8 is installed, the mounting table 22 and the ultrasonic motor 28 are connected by a steel belt 29 wound around the pulley 27 in an α shape, and the belt 29 is a leaf spring 30 fixed to the mounting table 22. It is held in an undeflected state by the tension.

A high torque is applied to the ultrasonic motor 28, a seek operation is applied to the mounting table 22 at a recording / reproducing position, or the mounting table 22 is directly driven to a card insertion / removal position. Further, a large self-holding force is given to the ultrasonic motor 28, and the mounting table 22 is stopped at an arbitrary position when there is no energization.

A reference surface for accurately positioning the optical card C with respect to the optical head 21 is provided on the upper surface of the mounting table 22. That is, a reference surface 22b for setting the one side edge position of the optical card C is provided at one side edge of the mounting table 22. Plate springs 31 and 32 for urging the optical card C against the reference surface 22b are provided on the other side edge of the mounting table 22. A reference surface 22c for setting the front edge of the optical card C is provided in the back of the mounting table 22, and the front edge of the optical card C is moved diagonally upward in front of the reference surface 22c. 22d are formed at three locations.

Reference plates 33 and 34 for setting the upper surface position of the optical card C are attached to the upper portions of both side edges of the mounting table 22. The upper surface of the protrusion 22d and the reference plate 3
A gap δ between the lower surface of each of the optical components 3 and 34 is set to be slightly larger than the thickness t of the optical card C. Then, on the lower surface of the mounting table 22, light shielding plates 35 and 36 used for detecting the position of the mounting table 22 are provided so as to project in parallel in the direction Y.

As shown in the partially enlarged cross-sectional view of FIG. 4 and the enlarged perspective view of FIG. 5, four through holes 22e are provided on both side edges of the mounting table 22 in the front and substantially central portions. A biasing means 40 for biasing the lower surface of the optical card C through the through hole 22e is provided independently on the lower surface of the mounting table 22.

A supporting shaft 41 of the urging means 40 is supported so as to pass through a lower portion of the through hole 22e in the direction X, and the supporting shaft 41 supports a substantially central portion of an arm 42. Arm 42
The upper half 42a is offset to the side opposite to the reference surface 22b, and the upper end 42b thereof abuts the lower surface of the optical card C. A coil spring 43 that biases the arm 42 in the rotation direction D is fitted on the support shaft 41, and a pin 44 is provided in the lower half portion 42c of the arm 42 in the direction X. One end 43 a of the coil spring 43 is engaged with the pin 44 and the other end 43 b is engaged with the mounting table 22,
The horizontal urging force Fs and the vertical urging force are applied to the upper end portion 42b of the arm 42.
Fp is generated.

On the other hand, when the mounting table 22 is moved to the card insertion / removal position, the protruding piece 45 acting on the pin 44 is provided on the base 4.
It is provided at each location. Further, photo interrupters 46 and 47 for detecting the card insertion / removal position of the mounting table 22.
Are provided at positions corresponding to the light shielding plates 35 and 36. In addition, the direction of the pin 44 described above is different in one side edge side and the other side edge side of the optical card C.
Interference between the pin 44 and the protruding piece 45 is prevented when the 2 moves.

Here, one of the photo interrupters 46, 47 is installed at a position shifted to the mounting table 22 side. Therefore, as shown in the graph of FIG. 6, the output m of the photo interrupter 46 is output earlier than the output n of the photo interrupter 47. The output m is output at the initial position where the laser light is focused on the optical card C, that is, the home position P1 and the card insertion / removal position P2 where the optical card C is inserted / removed with respect to the mounting table 22. The output n is output at the position P3 between the home position P1 and the card insertion / removal position P2. As a result, the mounting table position P is
It is divided into an area E where information is recorded and reproduced, areas F and G where the urging force of the urging means 40 is released or restored, and an area H where the operation of the ultrasonic motor 28 is stopped. Then, in this embodiment, the frequency f1 shown in FIG. 11 is switched to the lower frequency f2 to obtain the maximum torque T2 larger than the maximum torque T1 of the conventional example.

In order to switch the frequency f1 to the frequency f2,
The torque T1 is instantaneously switched to the torque T2 at the position P1 as shown by the solid line q in FIG. 6, and the torque T1 is instantaneously switched to the torque T2 at the position P3 as shown by the alternate long and short dash line r. And the torque T1 from the position P1 to the position P2 as shown by the two-dot chain line s.
The method of gradually switching to is selected. By switching as shown by the one-dot chain line r, the regions E, F, G and H can be clearly divided.

When a card insertion / removal command is issued, the mounting table 22 is moved in the direction of the card insertion / removal position by the operation of the ultrasonic motor 28, and the pin 44 of the urging means 40 abuts the projecting piece 45. The load torque Tf of the ultrasonic motor 28 at this time is a constant torque T0. At the same time, photo interrupter 4
Output m or output n is generated by 6, 47 and the shielding plates 35, 36, and the frequency f1 of the ultrasonic motor 28 is switched to the frequency f2. As a result, the maximum torque T1 of the ultrasonic motor 28 is switched to the maximum torque T2, and the ultrasonic motor 28 has a torque T2.
Thus, the mounting table 22 is driven. Further, when the mounting table 22 moves, the pin 44 receives a reaction from the projecting piece 45, the arm 42 rotates in the direction opposite to the direction D against the biasing force of the coil spring 43, and the biasing means 40 causes the optical card. Release the bias of C. And the card insertion / removal means is the optical card C.
To discharge.

On the other hand, when an information recording / reproducing command is issued after the optical card C is mounted on the mounting table 22, the maximum torque T2 of the ultrasonic motor 28 acts on the mounting table 22 and the mounting table 2
2 moves, and the pin 44 separates from the protrusion 45. As a result, the arm 42 rotates in the direction D to apply the horizontal urging force Fs and the vertical urging force Fp to the lower surface of the optical card C, and attach the optical card C to the first reference surface 22b and the reference plates 33 and 34. Energize. Next, at the position P1 or the arrangement P3, the frequency f2 of the ultrasonic motor 28 returns to the frequency f1, and the ultrasonic motor 28 causes the mounting table 22 to seek with a torque T0 smaller than the torque T1.

As described above, in the embodiment, the ultrasonic motor 28 is used.
Lower frequency f2 depending on position P1, P2, P3
The maximum torque of the ultrasonic motor 28 by switching to
Since T1 is increased to the maximum torque T2, the biasing force of the coil spring 43 of the biasing means 40 can be easily released. Therefore, the biasing force of the coil spring 43 can be increased, the upper surface position of the optical card C can be accurately set, and the ability to record and reproduce information can be improved.

Further, the arm 42 of the urging means 40 is a horizontal urging force for urging the lower surface of the optical card C against the reference surface 22b.
Fs and a vertical urging force Fp that urges the lower surface of the optical card C against the reference plates 33 and 34 are generated, and the one side edge position of the optical card C is moved by the leaf springs 31 and 32 and the urging means 40. Since the forces are set in cooperation with each other, the biasing force of the leaf springs 31 and 32 can be reduced. Therefore, the insertion / removal force of the card insertion / removal means can be reduced, the card insertion / removal means can be downsized, and the front edge position of the optical card C can be reliably settled.

Further, it is possible to set the side edge position of the optical card C only by the biasing means 40 without providing the leaf springs 31 and 32, and it is possible to reduce the number of parts.

If a material having a large slip resistance is applied to the upper end portion 42a of the arm 42, the horizontal urging force Fs can be increased and the optical card C can be settled with a larger force. Therefore,
The plate springs 31 and 32 can be replaced by arbitrary settling members, and the number of parts can be reduced.

[0031]

As described above, in the information recording / reproducing apparatus according to the present invention, the driving force of the driving means is increased in response to the signal of the detecting means. Therefore, the urging force of the urging means is increased. Can easily release the biasing force. Therefore, the flatness of the information recording medium can be improved by increasing the urging force of the urging means, and the information recording / reproducing capability can be improved. Further, by increasing the driving force of the driving means, the speed can be increased, the moving range of the mounting table can be narrowed, the card insertion / removal means can be downsized, and the entire size can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a front view of a state in which the mounting table is in a card insertion / removal position.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a partially enlarged sectional view.

FIG. 5 is a perspective view of a biasing means.

FIG. 6 is a graph showing the relationship between the position of the mounting table and the torque of the ultrasonic motor.

FIG. 7 is a partial plan view of a conventional example.

FIG. 8 is a perspective view of a conventional example.

FIG. 9 is a front view of a conventional mounting table in a card insertion / removal position.

FIG. 10 is a sectional view taken along the line AA of FIG. 9;

FIG. 11 is a graph of frequency and rotation speed of a conventional ultrasonic motor.

FIG. 12 is a graph showing the relationship between the position of the mounting table and the torque of the ultrasonic motor.

[Explanation of symbols]

 21 optical head 22 mounting table 21b, 21c reference surface 28 ultrasonic motor 31, 32 leaf spring 33, 34 reference plate 35, 36 shielding plate 40 biasing means 41 spindle 42 arm 43 coil spring 44 pin 45 projecting piece 46, 47 Photo-interrupter

Claims (2)

[Claims] 1. A mounting table having a first reference surface for adjusting the upper surface position of a card-shaped information recording medium and a second reference surface for adjusting the side edge position of the information recording medium, relative to the optical head. In the information recording / reproducing apparatus for recording / reproducing information on / from the information recording medium, the urging means for urging the information recording medium to at least the first reference surface, and the mounting table. Driving means, driving means for detecting the position of the mounting table, releasing means for releasing the biasing force of the biasing means, and increasing the driving force of the driving means in response to a signal from the detecting means. An information recording / reproducing apparatus comprising: an increasing unit. 2. The information recording / reproducing apparatus according to claim 1, wherein the urging unit urges the information recording medium with respect to the first and second reference surfaces.