JPS6032155A - Tape loading mechanism - Google Patents

Abstract

PURPOSE:To miniaturize a recording/reproducing device by providing a piezoelectric element which touches a rail set near a head cylinder to give vibrations to the rail, and a tape guide unit movably along the rail via a slider. CONSTITUTION:A rail 10 is made of a metal like brass band, etc. and set near a head cylinder 2, and piezoelectric elements 11 and 12 are attached at both ends of the rail 10. The phase of the AC voltage applied to both elements 11 and 12 is controlled so that one of both elements serves as an oscillation source which gives an elastic wave of bend vibration to the rail 10 and the other element serving as an absorber which absorbs the elastic wave transmitted to the rail 10. A tape guide unit 13 containing a slant post 3 and a guide roll 4 touches the rail 10 via a slider part 14 made of hard rubber, etc. and arranged movably in the axial direction of the rail 10.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a device that uses tape as a recording medium such as a VTR (video tape recorder). Concerning tape loading mechanism.

(Prior Art) FIG. 1 shows a state in which a magnetic tape (hereinafter referred to as tape) 2 is mounted around a head cylinder 2 in an M loading type VTR after loading is completed. The tape loading mechanism is configured such that a tape guide unit 5 having an inclined post 3 and an idle roller 34 that guide the tape can move in the direction of the arrow.

Conventionally, the means for moving this tape guide unit was
It is constructed by combining a normal motor that uses electromagnetic force with a reducer, arm, slider, etc. Since these mechanisms occupy a large space and weight within the VTR device, they are an impediment to making the VTR device smaller and lighter. Such problems are not limited to the M loading method, but also to the U loading method.
This problem also exists in VTRs using other loading methods, such as the loading method, and even in devices other than VTRs.

(Objective) The present invention uses a surface wave motor as a means for moving a tape guide unit in a tape loading mechanism, thereby making it possible to reduce the size of magnetic recording and reproducing devices such as VTRs.
The purpose is to reduce the weight.

(Structure) In the tape loading mechanism of the present invention, a rail is placed near the head ring, a piezoelectric element applies bending vibration to the rail, and the tape guide unit uses the vibration waves of the rail to move the rail through the slider. It is configured to move.

The present invention will be explained in detail below with reference to Examples.

In FIG. 2 showing one embodiment, a rail 10 is made of metal such as brass and is placed near the head sill 2. In FIG. Piezoelectric elements 11 and 12 are attached to the rail 10 at both ends of the rail 10;
The phase of the alternating current voltage applied to both piezoelectric elements is adjusted so that the piezoelectric element acts as an excitation source that gives elastic waves of bending vibration to one piezoelectric element, and the other acts as an absorber that absorbs elastic waves propagated through the rail 10. It has become so.

Reference numeral 13 denotes a tape guide unit having an inclined post 3 and a guide roller 4. As shown in FIG. It is possible to move in the direction. 15 is Shaan. Tape guide unit 1
A positioning pin 16 for positioning the loading of this tape guide unit 13 is installed at the tip of the rail 10, and a positioning metal fitting provided at one end of the rail 10.
It is designed to engage with

Note that this embodiment is a mechanism for the M loading method, so although it is omitted in Fig. 2, the head sill 2
A similar rail, piezoelectric element, and tape guide unit are also provided on the left side.

In this embodiment, to move the tape guide unit 13, a phase-controlled voltage is applied to the piezoelectric elements 11 and 12, and a lateral bending vibration is applied to the rail 10 as shown by the arrow in FIG. The elastic wave of this vibration is transmitted to the rail 10.
propagate along.

Now, for example, if we control the phase of the applied voltage so that the piezoelectric element 12 acts as an excitation source and the other piezoelectric element 11 acts as an absorber, an elastic wave moves from the piezoelectric element 12 to 11 on the rail 10. The tape guide unit 13 moves in the opposite direction accordingly.

Next, if the phases of the voltages applied to both piezoelectric elements 11 and 12 are controlled so that the elastic waves are propagated from the piezoelectric elements 11 to 12, the tape guide unit 13 will be It will start moving towards you. The reason for controlling the phase of the voltage applied to both piezoelectric elements 11 and 12 in this way is that if an elastic wave propagated from one end of the rail 10 is reflected at the other end, the traveling wave and the reflected wave will be separated. This is because the elastic waves are superimposed to form a standing wave, and the elastic waves no longer advance and the tape guide unit 13 also stops moving.

When a cassette is inserted in a VTR device,
The tape guide unit 13 has a piezoelectric element 11 on the rail 10.
At the side ends, an inclined post 3 and a guide roller 4 are located inside the tape.

During playback or recording operation, a phase-controlled voltage is applied to the piezoelectric elements 11 and 12, and the tape guide unit 13
moves toward the piezoelectric element 12 side.

Along with this, the inclined post 3 and the guide roller 4 hook the tape and pull it out from the cassette, and when it reaches the end on the piezoelectric element 12 side, the tape guide unit 13 is positioned at a predetermined position by the engagement of the positioning pin 16 and the positioning metal fitting 17. The tape is positioned and fixed to the head sill 2, and the tape is wound around the head sill 2, and tape loading is completed.

Next, during a stop operation, a phase-controlled voltage is applied to the piezoelectric elements 11 and 12 so that the direction of travel of the elastic waves in the rail 10 is opposite to that described above, and the tape guide unit 13 moves toward the piezoelectric element 11. Return to the initial 7-loading state.

FIG. 4 shows another embodiment of the M loading type tape loading mechanism. Two rails 20 and 21 are formed in a closed loop shape, and they are connected at a connection point 22, and a vibrator 23 made of a piezoelectric element is connected to this connection point 22, so that both rails 20 and 21 have elasticity. I am trying to apply waves. The tape guides 24 and 25 have a structure similar to that shown in FIG.
1 as shown by the arrow, and when loading is completed, the positioning metal fitting 2 L2 ? is placed near the head cylinder 2. It is designed to be positioned and fixed by engagement with.

In this embodiment, the rail is a closed loop, and the elastic waves propagated through the rails 20 and 21 are as in the previous embodiment.
It is never reflected, so no standing waves are generated,
You can continue progressing.

Both of the above two embodiments are based on the M loading method, but when applied to the U loading method,
One rail is installed around the head cylinder, and the tape guide unit hooks the tape on the rail and moves off the rail, which is basically the same as in the case of the M loading method.

(Effects) The tape loading of the present invention (the structure is composed of a tape guide unit with a slider, a rail, and a piezoelectric element, so unlike the conventional tape loading system, which is composed of a combination of electromagnetic elements and mechanical parts) Compared to a guide unit, the structure is simpler and the number of parts is smaller.Furthermore, the surface wave motor used in the present invention generates large torque at low speed, so a reduction gear is not required.In this way, the present invention This tape loading mechanism can greatly contribute to the reduction in size and weight of devices such as VTRs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional tape loading mechanism;
FIG. 2 is a partial perspective view showing one embodiment of the present invention, FIG. 3 is a sectional view showing a tape guide unit in the same embodiment, and FIG.
The figure is a route map showing another example. 2...Head cylinder, 10.21), 21.
...Rail, 11.12,23. ...Piezoelectric element, ]4 ...Slider, 13.24.25
...Tape guide unit. Patent Applicant: Ricoh Company, Agent: 2 Patent Attorneys

Claims (1)

[Claims] (1) A rail placed near the head cylinder, a piezoelectric element provided in contact with the rail and giving vibration to the rail, and a tape guide unit provided movably along the rail via a slider. A tape loading mechanism characterized by: