JPS5918296B2 - magnetic tape guide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape guide, and more particularly, to a tape guide body, an electrode is formed to generate an electric field by applying a voltage, and a magnetic tape base made of a lily dielectric is attracted to the action of the electric field. An object of the present invention is to provide a magnetic tape guide that can effectively stabilize the running of a magnetic tape.

For example, as shown in FIGS. 1 and 2, a conventional magnetic tape guide has a structure in which a guide roller 1 is rotatably supported on a shaft 3 by bearings 2a and 2b. The card roller 1 rotates as the tape runs, and guides the upper and lower edges of the magnetic tape 4 by means of its upper and lower flanges.

In this magnetic tape guide, the magnetic tape 4 and the guide roller 1 are in a mere adjoining relationship, and it is difficult to completely absorb vibrations of the magnetic tape at this position.

Further, the above magnetic tape guide does not have a function of controlling the tension of the running magnetic tape. The present invention makes it possible to completely absorb tape vibrations and to control tenostion, and each embodiment thereof will be described below with reference to the drawings.

3A and 3B are respectively a front view and a side view of the first embodiment of the magnetic tape guide according to the present invention, and FIG. 4 is an exploded perspective view of the magnetic tape guide of FIGS. 3A and 3B.

The magnetic tape guide 10 has an electrode insulating base 14 (for example, glass or baking material) on which electrodes 12 and 13 are attached, and a surface insulating layer 15 made of glass or the like, which are laminated on the front surface of a block-shaped tape guide body 11. Become.

The electrodes 12 and 13 are formed by photo-etching or the like,
The patterns are arranged alternately in the vertical direction, and voltages of different polarities (several 10 to several 100 volts DC) are applied to each pattern.

The magnetic tape 16 includes a tape base 16a and a magnetic layer 16b.
Toyorina ■).

The tape base 16a is a dielectric polyester film.) Next, the magnetic tape guiding operation of the magnetic tape guide 10 having the above structure during recording and reproduction will be explained with reference to FIGS. 5 and 6. do.

During a recording/reproducing mode in which the magnetic tape 16 runs, voltages of different polarities are applied to the electrodes 12 and 13 via lead wires (not shown).

The application of this voltage generates an electric field around the edge electrodes 12 and 13, which causes an electric field to appear in the area of the edge magnetic tape that is guided by the tape guide 10 (the part facing the front surface of the electrodes 12 and 13).
Electric polarization occurs in the polyester film tape base 16b of the magnetic tape 16, and an attractive force is induced between the electrodes 12, 13 and the tape base 16b in a direction in which they attract each other. In addition, when the magnetic tape 16 passes through the front surface of the magnetic tape guide 10, it is not simply attached to the surface insulating layer 15, but is attracted to the surface insulating layer 15, and the magnetic tape card 10 pass through. This friend, tape path 1 in the portion before passing through the magnetic tape guide 10 during the magnetic tape 16 (running in the direction of arrow A)
6A and the tape path 16B after passing through, the tape vibration is completely absorbed and insulated at the position of the magnetic tape guide 10. In this X, the surface insulating layer 15 is
2 and 13 from the magnetic tape 16, and because they are susceptible to edge abrasion when the tape runs while being attracted to it, it is made of a material that has a small coefficient of friction against the magnetic tape and is hard and hard to wear, such as sapphire or Use glass, etc.

Note that the surface insulating layer 15 is made thin in order to increase the above-mentioned Coulomb force. In addition, since the electrodes 12 and 13 have a comb-like pattern in the tape width direction, the magnetic tape 1
Polarization occurs in the tape base 16b of No. 6 on the average in the width direction, and a uniform attraction force is applied to the magnetic tape 16 in the tape width direction, which is favorable for tape guiding operation. Also,
The magnetic tape guide 10 also has the function of controlling the tape tension of the traveling magnetic tape.

In FIG. 6, if the coefficient of friction between the magnetic tape 16 and the tape guide 10 (surface insulating layer 15) is μ, and the attraction force of the magnetic tape 16 to the tape guide 10 is N, then the tape guide 10
The increase ΔT in tape tension T after passing through is △
T=μN. Here, by varying the voltage applied to the electrodes 12 and 13, the electric field changes and the adsorption force N changes proportionally. Therefore, by electrically controlling the adsorption force Nt,
It becomes possible to control the tape tension of the magnetic tape 16 in the tape path 16B after passing through the tape guide 10. FIGS. 7A and 7B and FIG. 8 respectively show a second embodiment of the magnetic tape guide according to the present invention.

The magnetic tape guide 20 of this embodiment has a configuration in which the electrode insulating base 14 in the first embodiment is omitted. In FIGS. 7A and 7B and FIG. 8, the same components as those shown in FIGS. 3A and B and FIG. 4 are given the same reference numerals. Electrodes 12 and 13 are formed on the back surface of a surface insulating layer (plate) 15.

The surface insulating layer 15 is directly adhered to the front surface of the tape guide body 11. Here, if an electrically insulating adhesive is used, the tape guide body 11 may be made of a conductive material, but in other cases, Teflon or other material may be used to ensure insulation between the electrodes 12 and 13. Use insulating material such as Bakelite. The magnetic tape guide 20 having the above structure has a simpler structure than the magnetic tape guide 10 of the first embodiment, and also functions in the same way. ).

Note that the magnetic tape 16 is connected to the magnetic tape guide 10 or 20.
The magnetic tape 16 is gradually charged due to the guiding action using the cloner, but the electric charge charged on the magnetic tape 16 is discharged through the carbstan etc. when it passes through the clamping drive unit of the carbstan and the pinch roller. , and no inconvenience will occur.

Further, in the rewinding and fast forwarding modes in which the magnetic tape runs away from the grounding path of the capstan or the like, the voltage applied to the electrodes 12 and 13 is zero.

Further, even when the electrodes 12 and 13 have a spiral pattern, the magnetic tape can be uniformly absorbed over the entire width.

Furthermore, the electrode pattern may be a combination of an electrode section to which a positive voltage is applied, an electrode section to which a negative voltage is applied, and an electrode section at ground potential. As described above, the magnetic tape guide according to the present invention has a pattern in which a plurality of electrode portions to which a positive voltage is applied and electrode portions to which a negative voltage is applied are arranged alternately on the tape square main body. , a comb-shaped electrode is provided that generates an electric field that acts on the dielectric magnetic table base when a voltage is applied, and the magnetic table is guided while being attracted to this electrode, so that the vibration of the magnetic table is reduced. The magnetic tape can be reliably absorbed and insulated at the position of the tape card, and by varying the applied voltage, the tension of the tape in the tape path after passing through the tape guide can be electrically controlled. The running stability of the magnetic tape guide of the present invention can be greatly improved, and the performance of the magnetic tape recording and reproducing apparatus in which the magnetic tape guide of the present invention is incorporated can be improved. ), the electric field is formed uniformly over the entire surface, and the magnetic tape can be attracted uniformly in the width direction, thereby further improving the stability of the tape running.

[Brief explanation of drawings]

1 and 2 are views showing an example of a conventional tape guide using guide rollers, and FIGS. 3A and 3B are a front view and a side view, respectively, of a first embodiment of the magnetic tape guide according to the present invention. Figures 4 and 4 are exploded perspective views of the magnetic tape guides shown in Figures 3A and B, and Figures 5 and 6 show the magnetic tape guides shown in Figures 3A and B guiding the magnetic tape, respectively. 7A and 7B are front and side views of a second embodiment of the magnetic tape card according to the present invention, and FIG. 8 is an exploded perspective view of this magnetic tape guide. 10, 20...Magnetic tape guide, 11...
...Tape guide body, 12, 13... Electrode, 14... Electrode insulation base, 15...
Surface insulating layer, 16...Magnetic tape, 16a...
...Magnetic layer, 16b...Magnetic table base.

Claims (1)

[Claims] 1 It has a pattern in which a plurality of electrode parts to which a positive voltage is applied and electrode parts to which a negative voltage is applied are arranged alternately, and the electric field acting on the magnetic tape base, which is a dielectric material, when a voltage is applied is generated. A magnetic tape guide characterized in that a comb-shaped electrode is provided on a tape guide body to attract and guide a magnetic tape.