JPS61222062A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To prevent magnetic sheet deformation and magnetic head damage by providing a stabilizing plate for stabilizing a magnetic sheet at the position of the magnetic head and a means for retreating the magnetic sheet and the stabilizing plate. from the magnetic head with the cassette being immobilized. CONSTITUTION:The magnetic sheet 2 on a disk is rotatably stored in the cassette while there are provided an aperture for inserting the stabilizing plate 14 and an aperture for inserting the magnetic head 16. A life member 24 for retreating the sheet 2 and the stabilizing plate 14 is movable vertically while an arm 24c faces a step 14c of the stabilizing plate 14. In the lowered state of the member 24, a projection 24 a of the member 24 is dropped into an aperture 15a of the regulating plate 14 so that the projection 24 is in approximately coincident with the sheet opposing surface of the plate 14 and it is interlocked with the plate 15 at the time of the rotation of the sheet 2. The step 14c is raised by the arm 24c in the raised state of the member 24 while the sheet 2 is also raised by the projection 24a. In such a manner, the sheet 2 is retreating from the head 16 unless required.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a recording or reproducing device, and particularly to a recording or reproducing device that records or reproduces information using a disc-shaped magnetic sheet housed in a cassette. [Summary of the Disclosure] The device disclosed herein uses a disk-shaped magnetic sheet housed in a cassette.

[As a recording or reproducing device that records or reproduces information, if the magnetic head is brought into contact with a magnetic sheet that is in a stopped state, or if the stabilizer is left facing closely from the opposite side for a long period of time, , the magnetic sheet may be locally deformed, or in the case of a portable device, the magnetic sheet may vibrate due to vibrations during transportation, which may cause the magnetic sheet to be struck and cause damage. In view of this, a means is provided for retracting the magnetic sheet and the stabilizer from the magnetic head while the cassette remains stationary, and the retracting means retracts the magnetic sheet and the stabilizer from the magnetic head except when necessary. This eliminates concerns about damage to the magnetic head due to deformation of the sheet or vibration during transportation. [Prior art] Using a disc-shaped rotating magnetic sheet housed in a cassette,
Various devices are known for recording or reproducing information via a magnetic head. Among recording or reproducing devices that use such a cassette-type rotating magnetic sheet, there is also known a device that uses a small flexible disc-shaped magnetic sheet with a diameter of about 5 cm. By the way, when performing high-density recording (or reproduction) using such a small-diameter magnetic sheet, the so-called recording wavelength must be made considerably short.
Also, the track pitch needs to be made smaller. In particular, in order to shorten the recording wavelength, the relative speed between the magnetic sheet and the magnetic head, in other words, the rotational speed of the magnetic sheet must be increased. Furthermore, as the recording wavelength becomes shorter, the influence of so-called spacing loss becomes large and affects the input/output values. (including through air film) must be carried out stably. As a method for bringing the small-diameter magnetic sheet described above into stable contact with the magnetic head, there is a method using a stabilizing plate as shown in FIG. 4. Here, we will explain Fig. 4. This figure is a perspective view showing a cassette and a stabilizing plate in which a magnetic sheet is housed, and l indicates the cassette. A magnetic sheet 2 is rotatably housed inside the cassette 1, and a center core 3 is integrated in the center of the magnetic sheet 2 to be connected to a spindle (not shown) for rotationally driving the magnetic sheet 2. A target is set. The cassette 1 is provided with an opening 1a for inserting the stabilizing plate 4, and the opposing surface of the opposite example is also provided with openings for inserting the regulating plate 5 and the magnetic head 6. FIG. 5 shows the main part of the AA cross section in FIG. 4. In FIG. 5, the magnetic sheet 2 is rotated by a stabilizer plate 4.
The concave portion 4c and the edges 4a and 4b of the magnetic head 6 are deformed substantially along the magnetic head 6, and the vibration of the magnetic sheet 2 itself is suppressed by the air flow created between the stabilizer plate 4 and the magnetic sheet 2. Although the regulating plate 5 is provided as necessary, it also forms an air flow between the regulating plate 5 and the magnetic sheet 2 to further stabilize the magnetic sheet. A head support plate 7 supports the magnetic head 6, and the support plate 7 allows the head 6 to move in the radial direction of the magnetic sheet 2. By using the configuration shown in FIGS. 4 and 5, the diameter of the magnetic sheet 2 is relatively small, and the diameter of the center core 3 is relatively large, which affects the deformation of the magnetic sheet 2. Even in such cases, a fairly stable recording or reproducing state can be achieved. [Problems to be Solved by the Invention] By the way, the magnetic sheet 2 as shown in FIGS. 4 and 5 is usually made of a flexible material several tens of μm thick such as P, E, T, (polyethylene terephthalate), etc. as its base material. A flexible sheet material is used. Therefore, in the case of the method using a stabilizing plate as explained above, if the rotation of the magnetic sheet 20 is left stopped for a long time, the head facing portion 2a of the magnetic sheet 2 will remain deformed. turn into. In particular, this situation occurs when the external environmental conditions change drastically during use, such as in the case of a so-called electronic camera, or when the period for rotating the magnetic sheet 2 is extremely short, or when the cassette 1
This is likely to occur if the device is left loaded inside the device for a long time. When the above-mentioned deformation of the magnetic sheet 2 occurs, the contact with the magnetic head 6 at the forming part and before and after it becomes inappropriate, making it impossible to record or reproduce partially, and the deformed part makes the magnetic sheet 2 Vibrations may occur and destroy the magnetic head 6. Furthermore, when an electronic camera or the like is frequently carried around during use, vibrations are often applied from the outside. In the case of a recording or reproducing device that requires the configuration shown in FIGS. 4 and 5, if external vibration is applied while the magnetic sheet 2 is still loaded in the device, the magnetic sheet 2 will vibrate. Alternatively, due to the resonance of the stabilizer plate 4, the magnetic sheet 2 may cause cracks at the tip of the magnetic head 6 (at the gap and around the gap), which may shorten the life of the head and sheet, or make recording or reproduction impossible. Such accidents occur. Such a situation cannot be avoided even if a liner made of non-woven fabric such as rayon is attached to the magnetic sheet contacting surface of the stabilizer plate 4. In order to prevent the above-mentioned accidents, proposals have been made to evacuate the magnetic head from the magnetic sheet contact position except when recording or reproducing or when rotating the magnetic sheet. However, in this case, although the above-described deformation of the magnetic sheet can be prevented, the support mechanism for the head section becomes considerably complicated and requires high precision in order to retract the magnetic head. Particularly when the track pitch becomes narrower or the recording wavelength becomes shorter, if the head support section is deformed due to the retraction movement of the magnetic head, track misalignment or azimuth misalignment may occur, impairing the recording or playback function. It will cause trouble. The present invention has been developed in view of the above circumstances, and can effectively prevent local deformation of the magnetic sheet caused by the head and stabilizer even when the magnetic sheet and cassette are left loaded for a long time. In addition, it is possible to eliminate the fear of damage to the magnetic head due to vibration during transportation of the device, and at the same time, it is a new method that does not deteriorate the positional accuracy of the head and does not require large-scale mechanical construction. The purpose is to provide a recording or reproducing device that is capable of recording or reproducing information. [Means for Solving the Problems] Accordingly, the present invention aims to solve the above problems by providing a means for retracting the magnetic head from the magnetic sheet and the stabilizer plate while the cassette remains stationary. be. [Function] That is, by retracting the magnetic sheet and the stabilizing plate from the magnetic head using the retracting means, accidents such as damage to the magnetic head due to deformation of the magnetic sheet or vibration of the magnetic sheet can be avoided. [Embodiments] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows the main parts of the stabilizer plate and magnetic sheet retraction mechanism in one embodiment of the present invention. In the figure, reference numeral 14 denotes a stabilizer plate, and its lower surface convex portion 14a performs the same function as the stabilizer plate 4 explained in FIGS. 4 and 5. 15 is a regulation plate, which also corresponds to the fourth plate mentioned above.
, 5 has the same effect as the regulating plate 5 in FIG. A magnetic head 16 is moved in the radial direction of the magnetic sheet by a moving mechanism (not shown). 29 is a spindle, the fourth
It fits with the center core 3 of the magnetic sheet 2 explained in the figure,
The magnetic sheet 2 is rotated by being driven by a motor (not shown). Tap holes 1 are provided at three locations in the stepped portion 14C of the stabilizer plate 14 described above.
4b is bored, and the height adjustment screw 22 is attached to the pressure spring 2.
It is screwed together with 3. One of the tips of these height adjustment screws 22 is in contact with the upper end surface of the center axis of the spindle 29, and the other two are in contact with the screw receivers 15b installed in the regulating plate 15, respectively, and are magnetically Stabilizer convex portion 14 for sheet 2. ! It plays the role of height adjustment. 21 magnetically seals the stabilizer plate 14! It is a pressure spring for pressing towards the -2 side, and is hung between it and the cover 30 (
M2 figures (A), (B)). Reference numeral 24 denotes an elevating member which is an example of magnetic sheet and stabilizing plate evacuation means, and is movable in the vertical direction (in the direction of arrows B and B' in the figure), and has two arm portions 24c formed on its upper end surface. The arm portion 24c is connected to the step portion 1 of the stabilizing plate 14 described above.
It is in contact with 4C. Further, this elevating member 24 is provided with a protruding portion 24a, and the upper surface of the protruding portion 24a substantially coincides with the sheet-facing surface of the regulating plate 15 in the opening 15a of the regulating plate 15 when the elevating member 24 is in the lowered state. As a result, when the magnetic sheet 2 rotates, it functions in conjunction with the regulating plate 15. Reference numeral 26 denotes a lever rotatable around a shaft 27, which is biased counterclockwise by a spring 28. A bottle 25 is implanted in one end 26b of the lever, and the pin 25 is connected to the above-mentioned elevating member 24. It is loosely engaged with the elongated hole 24b. Reference numeral 30 denotes a cam, and one end 26a of the aforementioned rotary lever 26 is in contact with the outer cam surface of the cam 30 under the action of a spring 28. A worm wheel 31 meshes with a worm gear 32 provided on the shaft of a motor 33. 34 is a phase cam, which controls the phase detection switch 35. In addition, these cams 30. Worm wheel 31 and phase detection cam 34
is integrally formed. In this configuration, FIG. 1 shows that the elevation member 24 is moved upward (arrow B
The figure shows the state where it has risen to the side). Here, when the cam 30 is rotated by 180 degrees by the motor 33, the elevating member 24 is moved downward (towards arrow B') by the low lift portion of the cam 30 via the rotation lever 26. If the cam 30 is rotated by 180 degrees again by the motor 33, the elevating member 24 will be in the state shown in FIG. 1 due to its raised portion. In addition, when the elevating member 24 is in the state shown in FIG.
The stepped portion 14c of the stabilizer plate 14 is pressed upward by the two arm portions 24c, and the stabilizer plate 14 rises against the urging force of the pressure spring 21. FIGS. 2(A) and 2(B) show the CC cross section in FIG. 1 when the elevating member 24 is in the lowered and raised states. FIG. 2(A) shows a state in which the elevating member 24 is descending. In this case, the arm portion 24c of the elevating member 24 does not come into contact with the stepped portion 14C of the stabilizing plate 14, so the stabilizing plate 14 The regulating plate 15 takes the position defined by the height adjusting screw 22 due to the biasing force of the pressure spring 21. Also, at this time, the protrusion 24a of the elevating member 24 is connected to the opening 15a of the regulating plate 15.
It enters inside and acts on the magnetic sheet 2 as part of the regulating plate 15. In this state shown in FIG. 2(A), the magnetic sheet 2 and the magnetic head 1 are
6 are in contact with each other, and information is recorded or reproduced while the magnetic sheet 2 is rotating. FIG. 2(B) shows a state in which the elevating member 24 is raised, and in this state, as described above, the arm portion 24 of the elevating member 24 is
Since the stepped portion 14C of the stabilizer plate 14 is pushed up by the force c, the stabilizer plate 14 is in a raised state against the biasing force of the pressure spring 21. At this time, since the protrusion 24a of the elevating member 24 also rises, the magnetic sheet 2 is also lifted by the protrusion 24a. The amount of rise of the magnetic sheet 2 at this time is such that even if the magnetic sheet 2 vibrates, the magnetic head 16 and the magnetic sheet 2 do not come into contact with each other, and the above-mentioned stabilizer 14 does not come into contact with the magnetic sheet 2 in a static state. shall be. In this state, the magnetic sheet 2 is slightly bent upward by the protrusion 24a of the elevating member 24, but unlike the case explained in Figure dX5, it is not affected by the stabilizing plate 14, so it can be left as it is for a long time. Even if it is done, it will not cause any deformation. Furthermore, even if vibration is applied from the outside in the state shown in FIG. 2(B), the magnetic sheet 2 and the magnetic head 16 do not come into contact with each other, so the vibration of the magnetic sheet 2 hits the tip of the magnetic head 16 and damages it. Nothing happened. As explained with reference to FIG. 1, the states shown in FIGS. 2(A) and 2(B) are repeated every time the cam 30 rotates 180 degrees. Therefore, by controlling the motor 33 in connection with the recording or reproducing operation, the magnetic sheet 2 and the stabilizer plate 1 are connected only when necessary.
4, the magnetic sheet 2 and the magnetic head 16 can be placed in the positional relationship of the recording or reproducing layer, so the above-mentioned accident will not occur.However, in FIG. 33, but it may of course be operated manually. 2 Other Embodiments] FIG. 3 shows an example in which the present invention is applied to an autofocus electronic still camera. As is well known, an electronic methyl camera forms an imaging signal using an imaging means such as COD, performs signal processing such as FM on this signal, and then records the ITV field or ITv frame on a rotating magnetic sheet. be. In FIG. 3, members designated by the same reference numerals as in FIGS. 1.2.4 and 5 described above have the same configurations and functions as described above. Also, rotating lever 226. The shaft 227 and the pin 225 each correspond to the pivot lever 26. in FIG.
This corresponds to the shaft 27 and the bottle 25. In FIG. 3, reference numeral 101 is a motor for accumulating energy in springs 112, 114, 125, 126, which will be described later, which are the driving sources for the lens barrel and shutter. The signal is transmitted to the control cam 104 and the notch gear 106 via the control cam 104 and the notched gear 106. Reference numeral 105 denotes a phase detection switch, which is used to cut off the power to the motor 101 when the control cam 104 and the notch gear 106 that rotates integrally with the control cam 104 have made one revolution by the motor 101. 107 is axis 1
08, and a rack portion 107a that engages with the aforementioned notched gear 106 is formed in a portion thereof. Further, the slide lever 107 is provided with a rack portion 107b that engages with a gear tooth portion 111b of the lens barrel charge ring 111. The lens barrel charge ring 111 is biased counterclockwise by a spring 112, and a protrusion 111a for biasing the lens barrel 113 is formed in a portion thereof. The lens barrel charge ring 111 is rotatable around the optical axis of the photographing lens (not shown).The lens barrel 113 is biased counterclockwise by a spring 114, and the lens barrel 113 is biased counterclockwise by a spring 114. Charge ring 1] Protrusion 11 of 1
It includes a protrusion 113a that engages with 1a, and
Claw portion 113b that is locked by locking member 115 during focusing
is provided. Although not shown in the figure, as this mirror f1113 rotates, a photographing lens (not shown) moves in the optical axis direction, and C
A subject image is formed on the imaging surface of an imaging device 100 such as a CD. The locking member 115 is rotatable around #115a and is biased counterclockwise around fffll+115a by a spring 117, and a focus signal is emitted from a well-known focus detection device (not shown). When the electromagnet 116 is energized, it is attracted by the electromagnet 116 and rotates clockwise, and its tip 115b engages with the claw portion 113b of the lens barrel 11-3, and the spring 114 of the lens barrel 113 Stop counterclockwise rotation. Reference numeral 119 denotes a shutter charge lever that is biased counterclockwise by a spring 120 around a shaft 119a, and a bottle 119b planted at one end of the shutter charge lever is engaged with one end 107d of the slide lever 107 described above. On the other hand, the bottle 119c planted at the other end comes into contact with the shutter leading blade 121. Here, the aforementioned rotating lever 226 is disposed in an interlocking relationship with the lever 119, and when the lever 119 rotates clockwise, it also rotates clockwise, and when the lever 119 rotates counterclockwise, it similarly rotates. Rotate clockwise. Reference numerals 121 and 123 are leading and trailing blades of the shutter, which are urged upward in the figure by springs 125 and 126, respectively. Reference numerals 122 and 124 are control electromagnets for the shutter blades 121 and 123, and their energization is controlled by a known shutter control circuit (not shown). 109 is the seven hook portion 10 of the aforementioned slide lever 107.
7c, and 110 is a tension lever that engages with lever 1.
This is the spring that energizes 09. In this configuration, its operation will be explained. FIG. 3 shows a state in which shutter charging has been completed, and in this state, since the charge lever 119 is rotating clockwise, the rotating lever 226 is also rotating clockwise. The elevating member 24 is in the raised position as shown in FIG. In this state, when the camera release operation is performed, the seat rotation motor (not shown) starts and the spindle 29 starts rotating.
24 is energized. Next, the release operation causes the tension lever 109 to release the spring 11.
When the slide lever 107 is unlocked by being rotated counterclockwise against zero, the lens barrel charge ring 111 is rotated counterclockwise by the biasing force of the spring 112.
At the same time, the slide lever 107 also moves to the left. At this time, the shutter charge lever 119 is also rotated counterclockwise by the spring 120, and the shutter leading blade 121 is pressed by the bottle 119C.
It will be held by Also, lever 119 at this time
0 rotation in the counterclockwise direction, the rotation lever 226 also rotates in the counterclockwise direction, whereby the elevating member 2 is rotated as shown in FIG.
4 descends and the magnetic sheet 2 comes into contact with the magnetic head 16,
Further, the stabilizer plate 14 is also lowered to its normal position. Meanwhile, at this time, the lens barrel 113 is also rotated counterclockwise by the spring 114, but as described above, the rotation is stopped by the locking member 115 at the in-focus position of the photographic lens, and the photographic lens (not shown) is brought into focus. The focus position is controlled. Next, in synchronization with the drive timing of the image sensor 100, the electromagnet 122 holding the shutter leading blade 121 is de-energized, and the leading blade 121 is then further moved by the spring 125 to move the shutter trailing blade 123 as a predetermined time elapses. When the electromagnet 124 being held is de-energized, the rear blade 123 is moved by the spring 126 to close the aperture, and the exposure of the image sensor 100 is completed. Thereafter, recording is performed on the magnetic sheet 2, and then the head 16 is moved to the next recording position. Also, when moving the head at this time, the motor 101 is energized, which moves the slide lever 107 to the right via the gears 102, 103 and 106, and at this time, the shutter charge lever 119 moves clockwise. By rotating, the shutter blades 121 and 123 are returned to the illustrated positions. Further, as the lever 119 rotates at this time, the rotating lever 226 is also rotated clockwise, and the elevating member 24 rises as shown in FIG.
Then, the stabilizer plate 14 is retracted from the head. When the shutter charging is completed, the slide lever 107 is locked by the tension lever 109 engaging with the hook portion 107c, and at this point, the switch 1o5 is activated by the cam 104, so that the slide lever 107 is locked. Motor 101 is stopped. In the embodiment shown in FIG. 3, the shutter is shown as a slit-type shutter made of two blades, but it goes without saying that a so-called half-open type shutter may also be used. In the example of the electronic camera described above, the stabilizing plate 14 and the magnetic sheet 2 are retracted from the magnetic head 16 by interlocking with an automatic focusing mechanism, but in the case of Hiroko's eyelid camera, the retraction of the stabilizer plate 14 and the magnetic sheet 2 is performed in conjunction with, for example, a quick return mirror mechanism. Let me [
Good too. In this way, when applied to an electronic camera, the above operation is performed only during recording by linking with the exposure mechanism, contributing to improved sequence reliability, simplification of the mechanism, and miniaturization. [Effect] As explained above, according to the present invention, recording, reproduction, etc.
Since the stabilizer plate and the magnetic sheet can be moved up and away from the magnetic head except when necessary, accidents such as deformation of the magnetic sheet and damage to the magnetic head can be effectively prevented.Moreover, in the present invention, the magnetic head is moved up and away. Therefore, the positional accuracy of the head does not deteriorate, and the configuration does not need to be large-scale.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the main parts of the stabilizer plate and magnetic sheet retraction mechanism in one embodiment of the present invention, Figure 2 (5) and C
B) is a cross-sectional view taken along the line C-C in FIG. 1 with the member shown in FIG. FIG. 4 shows the present invention of a conventionally proposed recording or reproducing device using a cassette type magnetic sheet. FIG. DESCRIPTION OF SYMBOLS 1... Cassette, 2... Magnetic sheet, 3... Center core, 14... Stabilizer plate, 15... Regulating plate, 16
. . . Magnetic head, 24 . . . Lifting member, 26; 226
...Rotating lever, 29...Spindle, 30...
Cam, 33; 101...Motor, 100...Image sensor, 107...Slide lever, ll! - Lens barrel charge ring, 113... Lens barrel, 119...
・Shutter charge lever, 121, 123...
・Shutter blade.

Claims (1)

[Claims] A recording or reproducing device that records or reproduces information using a disk-shaped magnetic sheet housed in a cassette, comprising: a recording or reproducing magnetic head; A stabilizing plate is arranged to closely face the magnetic head through a magnetic sheet in order to stabilize the magnetic head, and a stabilizing plate is arranged to closely face the magnetic head through a magnetic sheet, and a stabilizer plate is arranged to retract the magnetic sheet and the stabilizing plate from the magnetic head while the cassette remains stationary. A recording or reproducing device characterized by comprising: