JPS60113350A - Tape guide post - Google Patents

Abstract

PURPOSE:To enable to return a tape to a regular running state automatically even when the tape is deviated from the tape running position and maintain a guide post itself at a regular tape contolling position by providing a piezo-electric element capable of expansion and contraction in axial direction in a flange and expanding and contracting the piezo-electric element according to deviation of a tape in the direction perpendicular to the running direction of the tape. CONSTITUTION:An upper flange 12 and a lower flange 13 are fixed in axial direction separating from each other in the upper part of a fixed shaft 11, and a rotary sleeve 14 is provided rotatably between upper and lower flanges 12, 13. Annular, laminated type piezo-electric elements 15, 16 are fixed on opposite faces of upper and lower flanges 12, 13. The distance of separation between piezo-electric elements 15 and 16 is set a little larger than the width of a running tape 17. The laminated type piezo-electric elements 15 and 16 are made expandable and contractible in axial direction against applied voltage, and inner peripheral faces of the piezo-electric elements 15 and 16 make slide contact with outer peripheral face of the rotary sleeve 14. Plural piezo-electric elements 201-20n are laminated through electrodes 211-21n+1 formed on upper and lower end faces of the piezo-electric elements, and voltage of reverse polarity is applied alternately to end faces of these piezo-electric elements.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape guide post that regulates the position of a running tape in a direction perpendicular to the tape running direction.

BACKGROUND OF THE INVENTION FIG. 1 is a diagrammatic plan view showing the configuration of a tape transport section of a helical scan type magnetic recording and reproducing apparatus. The tape 1 is fed out from a supply reel (not shown), is inclined at a predetermined angle with respect to the transpost surface by the inclined post 2, and reaches the guide post 5 via the posts 8 and 4. The running tape 1 is regulated in its position in the direction perpendicular to the tape running direction by the guide post 5, and then is placed on the outer peripheral surface of a fixed drum (not shown) on the lower side of the head drum 6, which consists of a rotating drum and a fixed drum. It runs along the outer peripheral surface of the head drum 6 guided by the formed lead surface. A recording/reproducing head is attached to the outer peripheral surface of the rotating drum, and information is recorded/reproduced on the tape while being helically scanned by the recording/reproducing head. head drum 6
The tape l fed out from the tape is returned parallel to the tape transkeed surface by the inclined post 7 and then wound onto a take-up reel.

It is extremely important to run the tape stably in a magnetic recording/reproducing device, and if the tape is not run accurately in a direction perpendicular to the tape running direction, the relative position between the tape running position and the recording/playback head will deviate. This may cause image distortion and noise. Therefore, the tape position of the running tape 1 in the direction perpendicular to the running direction is regulated by the guide post 5 described above, so that the tape 1 runs accurately and stably with one end always in contact with the flange of the guide post 5. . However, during use, some disturbance may cause the position of the flange of the guide post 5 to deviate from the normal tape regulating position, or the running tape may deviate from the normal running position. In this case, since the conventional guide post is configured to restrict the running of the tape using a fixed flange, it is necessary to return the flange position of the guide post 5 to the normal tape regulating position or to adjust the running tape to the normal running position. There was a problem where it could not be returned to its original position. In particular, it is an unavoidable problem that the guide post shifts from its normal position due to external disturbances, and when the guide post itself shifts, the running tape also shifts.

OBJECT OF THE INVENTION The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to automatically maintain the tape in its normal running state even if the tape deviates from its normal running position or the guide post itself deviates from its normal tape running regulation position. Another object of the present invention is to provide a tape guide post that can maintain the guide post itself at a regular tape regulating position.

SUMMARY OF THE INVENTION The present invention provides a tape guide post that regulates the tape position in a direction perpendicular to the tape running direction by flanges spaced apart in the axial direction. The piezoelectric element is provided so that the piezoelectric element expands and contracts in response to tape deviation in a direction perpendicular to the tape running direction.

Embodiment FIG. 2 is a side view showing the configuration of an example of the guide post 10 according to the present invention. In the figure, reference numeral 11 indicates a fixed shaft, and an upper flange 12 and a lower flange 18 are fixed to the upper part of the fixed shaft 11 while being spaced apart in the axial direction. Arranged so that it can rotate freely. Furthermore,
Annular laminated IIE electric elements 15 and 16 are fixedly arranged on the upper and lower flanges 12 and 18 on their opposing surfaces, and the distance between the piezoelectric elements 15 and 16 is equal to the distance of the running tape 1.
Set the laminated mold pressure slightly larger than the tape width of 7.
The elements 15 and 16 are configured to be able to expand and contract in the axial direction with respect to the application 11EE, as will be described later, and are configured such that the inner circumferential surfaces of the piezoelectric elements 15 and 16 are in sliding contact with the outer circumferential surface of the rotating sleeve 14. In this example, the top regulation configuration is used, and in a normal state, the running tape 17 has a side edge always on the top side of the piezoelectric element 1.
FIG. 3 is a perspective view showing the structure of an example of the laminated piezoelectric element described above. In this example, a plurality of EE1!s are formed in an annular shape and have alternately opposite polarization directions so as to expand and contract in the direction of the arrow depending on the applied voltage. Electrodes 21□...21n+ formed on the upper and lower end surfaces of the element 20□...2on
The piezoelectric elements are stacked one on top of the other, with the piezoelectric elements having opposite polarity applied alternately to the end faces of the piezoelectric elements. Figure 4 shows EEl'l! used in this example. It is a graph showing the amount of expansion and contraction of the element with respect to the applied voltage, where the horizontal axis shows the applied voltage and the vertical axis shows the amount of expansion and contraction. The pressure element 20□...20n expands when positive [E] is applied in one bulk direction,
Negative i! It is assumed that when a field is applied, it contracts, and when a field is applied,
It has linearity with respect to E. Therefore, if a plurality of piezoelectric elements are stacked as shown in FIG.
The lE11 element expands and contracts in the same direction according to the applied voltage, and even if the amount of expansion and contraction of one piezoelectric element is small, it becomes possible to obtain a large amount of expansion and contraction as a whole. Therefore, the second
As shown in the figure, if the outer end surfaces of the laminated FEW elements 15 and 16 are fixed to the flanges 12 and 18 and are slidably disposed on the outer circumferential surface of the rotating sleeve 14, the tape 17 can be moved to the normal running position. Even if it deviates from the stacked type lE! The expansion and contraction movements of the elements 15 and 16 enable accurate regulation, and even if the flange deviates from the normal tape regulation position, it is possible to maintain the normal position.

FIG. 5 is a perspective view showing an example of the structure around the head drum of a magnetic recording/reproducing device that uses guide posts according to the present invention to regulate tape running. In this example, a guide boss) 80 is disposed at the entrance of the head drum, and the tape 81 is run while being in contact with the lower end surface of the FE electric element 88 fixed to the upper flange 82 of the guide boss 8o, and is perpendicular to the running direction. Regulates the tape position in the direction of The tape 81 is guided diagonally through a guide boss 80 with its lower edge touching a lead surface 85 formed on a fixed drum 84, and is guided to a recording/reproducing head 87 immediately installed on the rotating drum 36.
is helically scanned and reaches the inclined post 88. A pressure sensitive element 89 is embedded in the lead surface of the fixed drum 84 to detect deviation in a direction perpendicular to the running direction of the tape 81.

Based on the output from the pressure-sensitive element 89, the deviation of the tape is regulated by the guide boss 80 (a voltage is applied to the E-ton element 88 and the pressure applied to the pressure-sensitive confectionery 39 is constant at all times). With this configuration, even if the running tape deviates from its normal running position due to some disturbance, it will always be returned to the constant running position by the expansion and contraction of the piezoelectric element 88 in the direction orthogonal to the tape running direction. Become. For example, when the tape 81 shifts upward due to some disturbance, the pressure on the pressure sensitive element 89 decreases, and the pressure sensitive element 89 detects this.

When E 11 E is applied to the piezoelectric element 88 according to the amount of deviation of the tape 81 based on the output from the pressure sensitive element 89, the piezoelectric element 83 expands downward and pushes the tape 81 downward.
As a result, the tape 31 is returned to its normal running position. Furthermore, if the guide post 80 shifts upward or downward from the normal tape regulating position due to some disturbance, the tape 81 also shifts upward or downward, causing W! 3. It is detected by the E element 89. E! If a positive or negative voltage corresponding to the amount of deviation is applied to the element 38, the piezoelectric element 88
expands downward or contracts upward, so the side edge of the tape 81 that is constantly running is in contact with the end surface of the piezoelectric element 83, and the tape 81 is always EE1! The element 38 allows the vehicle to run stably without any deviation or slight vibration in the direction perpendicular to the running direction.

In the above embodiment, EEII! is attached to the flanges at both ends. The configuration was such that the elements were arranged, but as shown in Figure 6, only the upper flange had EEI! A similar effect can be achieved by a configuration in which the element 41 is provided. When using the guide post shown in FIG. 6, for example, when the tape shifts upward due to a disturbance, it can be moved by applying a voltage to the piezoelectric element 41 according to the amount of shift to extend it downward or upward. The position of the tape can be precisely regulated. Also, even if the guide post 4o itself deviates downward or upward from the tape regulation position, it will be negative or positive depending on the amount of deviation. By applying pressure, the piezoelectric element 41 can be contracted or expanded to maintain the tape in its normal running position. In this example, IIEi! is applied only to the upper flange. Although the piezoelectric element is arranged in the structure in which the piezoelectric element is arranged, in the case of the 1-lower regulation, the piezoelectric element can be arranged in the lower flange.

In the above-mentioned embodiment, a laminated mEE11E element is used, but if the amount of deviation of the tape or guide distortion is small, a single EEI! element is used instead of the laminated type. It is possible to sufficiently regulate the amount using elements.

Furthermore, in the above-mentioned example, the tape running state is detected by a pressure-sensitive element disposed on the tape running surface, and the
The WEE applied to the E element is controlled, but the envelope of the playback output from the recording/playback head is detected,
The tape running state can be detected based on the fluctuation, and the voltage applied to the piezoelectric element can be adjusted accordingly.

Further, although an annular piezoelectric element is used in the above example, it is of course possible to use an EEII element other than an annular shape, since the piezoelectric element may be disposed at least in a portion that contacts the tape.

As described in detail, if the guide post according to the present invention is used, even if the tape running state changes due to some disturbance, it can be automatically and accurately returned to the normal tape running state, and the guide post itself can be adjusted to the normal tape running state even if the tape running state changes due to some disturbance. Even if the tape deviates from the regular tape regulation position, tape running can be automatically regulated at the proper tape regulation position, effectively preventing the generation of noise caused by deviations or microvibrations in the direction perpendicular to the tape running direction. It becomes possible to do so.

[Brief explanation of the drawing]

FIG. 1 is a diagrammatic plan view showing the configuration of the tape transport section, FIG. 2 is a side view showing the configuration of an example of the guide post according to the present invention, and FIG. 8 is an example of the laminated piezoelectric element according to the present invention. FIG. 4 is a graph showing the relationship between the displacement amount of the piezoelectric element and the voltage. FIG. FIG. 6 is a side view showing an example of the shape of the guide post according to the present invention. 10.80.40... Guide boss 11... Fixed shaft 12.82... Upper flange 18... Lower flange 14... Rotating sleeve 15, 16, 82.41...
・Piezoelectric element 17.81... Tape 84... Fixed drum 85... Lead surface 86... Rotating drum 87.
...recording/reproducing head 88...slanted post figure 1, ? '/ Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] L In a tape guide post that regulates the tape position in a direction perpendicular to the tape running direction using flanges spaced apart in the axial direction, at least one flange is provided with a piezoelectric element that can be expanded and contracted in the axial direction. 1. A tape guide post characterized in that said piezoelectric element is configured to expand and contract in response to tape deviation in a direction perpendicular to said tape guide post.