JPH0249006Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a magnetic recording and reproducing apparatus, and more specifically to a magnetic recording and reproducing apparatus in which a tape cassette can be easily installed.

A tape cassette mounting device in a conventional magnetic recording/reproducing apparatus includes a first sliding plate that is driven by a pushing force applied to the tape cassette to insert the tape cassette to turn on a power switch; A second sliding plate has an engaging portion that engages with the first sliding plate, and the first sliding plate is driven by the voltage supplied through the power switch to maintain the power switch in the on state. and a driving means for driving the second sliding plate to the position, the pushing force is used to turn the power switch on, and the first sliding plate controls the power switch to the on state. The second sliding plate is driven to this position to maintain the power switch in the on state.

However, between the time when the power switch is turned on by the first sliding plate and the time when the first sliding plate maintains the power switch in the on state by the second sliding plate,
There is a time delay corresponding to the drive speed of the second sliding plate. There was a drawback that the pushing force into the tape cassette had to be maintained during this time delay. Moreover, when used as a car stereo device, this time delay period causes a drawback that it interferes with driving operation.

Furthermore, in order to shorten the period of time during which the pushing force into the tape cassette is maintained, it is necessary to increase the driving speed of the second sliding plate. The disadvantage was that the noise of the gears became louder and the damage to the gears increased.

The present invention has been developed in view of the above, and is a magnetic recording device that eliminates the above-mentioned drawbacks by eliminating the need for almost any period of continuous application of pushing force to the inserted tape cassette, and allowing the tape cassette to be easily mounted. The purpose is to provide a playback device.

This purpose, according to the present invention, includes switching means connected in parallel to a power switch controlled to be turned on by a first sliding plate, and a voltage outputted through the power switch being supplied. This is achieved by comprising a holding circuit which has a time constant circuit and maintains the switch means in an on state for a predetermined period of time using an output voltage.

The present invention will be explained below with reference to examples.

FIG. 1 is an explanatory diagram showing an example of a tape cassette loading device in a magnetic recording/reproducing apparatus to which the present invention is applied, and FIG. 2 is a circuit diagram showing an embodiment of the present invention.

Sliding plates 2 and 3 are slidably attached to a chassis side plate 1 of the magnetic recording/reproducing device, and a power switch 5 such as a micro switch is mounted on the chassis side plate 4.
is fixed. A cam plate 6 as a power switch operating member is rotatably mounted on the chassis side plate 1. A bent portion 7 that faces the actuator of the power switch 5 and drives the power switch 5 is formed at one end of the cam plate 6, and a rod 8 fixed to the sliding plate 2 is formed at the other end of the cam plate 6. A cam surface 9 is formed which comes into contact with the cam surface 9. A rod 11 is fixed to the sliding plate 2 and drives the sliding plate 2 by the pushing force applied to the tape cassette 10 during insertion by coming into contact with the tape cassette 10. One end of a coil spring 12 is attached to the chassis side plate 1, and the other end of the coil spring 12 is attached to bias the cassette in the direction of ejecting the cassette (in the direction of arrow A). In addition, the rod 11
An engaging body 25 is provided which is connected to the cover 26 and is slidably engaged with the cover 26 and moves in conjunction with the rod 11. The engaging body 25 has a locking piece (not shown) that engages with the tape cassette 10. It is installed in one piece.

As shown in FIG. 1b, the sliding plate 3 has a protrusion 14 that faces the bent portion 13 that protrudes from one end of the sliding plate 2, and a protrusion 15 that protrudes into the chassis. One end of a coil spring 20 is attached to the chassis side plate 1, and the other end of the coil spring 20 is attached to bias the sliding plate 3 in the tape cassette ejecting direction. A lever 16 that functions as a stopper for the sliding plate 3 is rotatably mounted on the chassis side plate 1, and the lever 16 has an inclined surface on which a rod 17 fixed to the sliding plate 3 slides, as shown in FIG. 18 and a recess 19 into which the rod 17 engages are formed.

On the other hand, a motor (not shown) is driven by the output of a drive circuit to which a power supply voltage is supplied via a power switch 5. A gear 21 driven by this motor is provided on the chassis, and the gear 21 has a first
As shown in FIG. d, a gear 23 meshes with the gear 23, and a gear 22 meshes with the gear 23. A protrusion 24 is fixedly attached to the gear 22. The protrusion 24 contacts the protrusion 15 of the slider 3 and drives the slide plate 3 by rotation of the gear 22. The gear 23 is rotatably mounted on the shaft of the gear 21 and is pivotally mounted on a moving body that is driven in the direction of arrow B by a cam (not shown) when the gear 21 rotates by a predetermined angle. By moving in the direction of arrow B, the gear 23 moves along the gear 21, disengaging the gears 22 and 23, and stopping the rotational drive of the gear 22.

On the other hand, in FIG. 2, 30 is a power supply terminal to which a power supply DC voltage is supplied, and 31 is a motor drive circuit which drives a motor 32 by supplying the power supply DC voltage. As described above, the motor 32 drives the gear 21. The power DC voltage supplied to the power supply terminal 30 is supplied to the motor drive circuit 31 via the power switch 5.

Further, the power DC voltage supplied via the power switch 5 is supplied via a diode 33 to a holding circuit 36 consisting of an integrating capacitor 34 and a resistor 35. Transistor 3 is connected in parallel to power switch 5.
7 is connected, and the output voltage of the holding circuit 36 is supplied to the base of the transistor 37, so that the output voltage of the holding circuit 36 controls the transistor 37 to be in an on state. A transistor 38 is connected in parallel to the integrating capacitor 34, and an eject signal voltage outputted when the tape cassette is ejected is supplied to the base of the transistor 38, so that the transistor 38 is controlled to be in an on state by supplying the eject signal voltage. be.

For convenience of explanation, first, the operation in the case where the holding circuit 36 and the transistors 37 and 38 are not provided will be explained.

When the tape cassette 10 is inserted, the end surface of the tape cassette 10 comes into contact with the rod 11, and the pushing force applied to the tape cassette 10 causes the sliding plate 2 to move in the direction of arrow C against the pullback force of the coil spring 12. I am made to do so. This movement of the sliding plate 2 brings the rod 8 into contact with the cam surface 9 of the cam plate 6, and the cam plate 6 is rotated counterclockwise. This rotation of the cam plate 6 causes the bent portion 7 to press the actuator of the power switch 5 to turn the power switch 5 on. If the pushing force applied to the tape cassette 10 is released in this state, the sliding plate 2 will be pulled back in the direction of arrow A by the pulling force of the coil spring 12, and the tape cassette 10 will be ejected.

When the power switch 5 is turned on, the motor is driven and the gear 21 rotates clockwise. The rotation of gear 21 is transmitted to gear 22 via gear 23, and gear 22 rotates. The rotation of the gear 22 causes the protrusion 24 to move the sliding plate 3 in the direction of arrow C via the protrusion 15 against the pullback force of the coil spring 20. During this movement, the rod 17 moves while slidingly contacting the slope 18 of the lever 16.

When the gear 21 rotates by a predetermined angle, the gear 23 is moved in the direction of arrow B by a cam (not shown).
The gear 22 stops rotating, and the sliding plate 3 stops moving. When the gear 22 stops rotating, the rod 17 is engaged with the recess 19, the sliding body 3 is not pulled back by the force of the coil spring 20, and the protrusion 14 of the sliding plate 3 is not slid. Bent part 13 of plate 2
The bent portion 7 of the cam plate 6 maintains the position of the sliding plate 2 in a state in which the actuator of the power switch 5 is pressed. Therefore, even if the pushing force applied to the tape cassette 10 is released in this state, the sliding plate 2 will not be pulled back in the direction of arrow A by the force of the coil spring 12, and the power switch 5 will remain in the on state. It is to be maintained,
Insertion of the tape cassette 10 is completed.

Furthermore, when the tape cassette is being ejected, a pushing force is applied to the tip of the lever 16, the engagement between the rod 17 and the recess 19 is released, and the sliding body 3 is moved in the direction of arrow A by the pullback force of the coil spring 20. However, the sliding body 2 moves in the direction of arrow A due to the pullback force of the coil spring 12. This movement of the sliding body 2 in the direction of arrow A causes the tape cassette 10 to move towards the rod 1.
1 applies a force in the direction of arrow A and ejects it. In this case, the coil spring 1 is applied almost at the same time as the upward force is applied to the tip of the lever 16.
2 is applied to the tape cassette 10 in the direction of arrow A, and this pulling force releases the lock between the locking piece of the engaging body 25 and the tape cassette 10.

However, when the tape cassette 10 is inserted, after the power switch 5 is turned on by the bent portion 7 of the cam plate 6, the sliding plate 2 is brought into a state of maintaining the power switch 5 in the on state by the sliding plate 3. If the pushing force applied to the tape cassette 10 is released during this period, the sliding plate 2 returns to the direction of arrow A, and the power switch 5 is turned off. For this reason, it is necessary to continue applying a pushing force to the tape cassette 10 for a certain period of time.

For this purpose, according to the present invention, a holding circuit 36 and transistors 37 and 38 are provided, which function as described below.

When the tape cassette 10 is inserted, the transistor 38 is off. When the sliding plate 2 is moved by inserting the tape cassette 10 and the power switch 5 is turned on, the power DC voltage is supplied to the motor drive circuit 31, the motor 32 rotates, and the gear 22 rotates. move. On the other hand, at the same time as the power switch 5 turns on, the power supply DC voltage is applied to the integrating capacitor 34 via the diode 33.
Integrating capacitor 34 is charged and holding circuit 36
generates an output voltage. The output voltage of the holding circuit 36 turns the transistor 37 on. Note that the diode 33 is for blocking reverse current, and the integrating capacitor 34 is not discharged via the power switch 5.

Even if the power switch 5 turns off after the transistor 37 turns on, the holding circuit 36
For a predetermined period determined by the time constants of the integrating capacitor 34 and the resistor 35 set in
is maintained in the on state, a power supply DC voltage is supplied to the motor drive circuit 31 via the transistor 37, and the motor 32 continues to be driven to rotate. Here, the predetermined period during which the holding circuit 36 maintains the transistor 37 in the on state is at least the period from when the power switch 5 is turned on due to the movement of the sliding body 2 until the gear 21 rotates by a predetermined angle. Set it.

Therefore, after the power switch 5 is turned on by the movement of the sliding plate 2 upon insertion of the tape cassette 10, the transistor 37 is maintained in the on state even when the pushing force applied to the tape cassette 10 is released. Therefore, by releasing the pushing force applied to the tape cassette 10, the sliding plate 2 moves in the direction indicated by the arrow A.
Even if the power switch 5 is temporarily turned off in the direction of , the motor 32 continues to rotate and the sliding plate 3 continues to move in the direction of arrow C. Furthermore, when the sliding plate 2 is returned in the direction of arrow A, the bent portion 13 of the sliding plate 2 is engaged with the protrusion 14 of the sliding plate 3, and the sliding plate 2 stops, and continues to advance. sliding plate 3
As the slide plate 2 moves in the direction of arrow C, the sliding plate 2 moves in the direction of arrow C.
It will be moved in the direction. On the other hand, since the tape cassette 10 is engaged with the locking piece of the engaging portion 25, the sliding plate 2 is moved by the sliding plate 3 toward the arrow C.
When being moved in this direction, the tape cassette 10 moves in the direction of arrow C together with the sliding plate 2. Further, when the gear 21 rotates by a predetermined angle due to the rotation of the motor 32 due to the transistor 37 being turned on, the movement of the sliding plate 3 in the direction of arrow C stops; The rod 17 is engaged with the recess 19 of the lever 16 and is connected to the power switch 5 via the cam plate 6.
is maintained in the on state by the sliding plate 2.

Therefore, when inserting the tape cassette 10, once the power switch 5 is turned on, it is only necessary to maintain the pushing force against the tape cassette 10 during the charging period of the integrating capacitor 34, and this charging time is Since it is extremely short, there is almost no need to maintain a pushing force into the tape cassette 10. Therefore, there is no need to increase the rotational speed of the gear 22, and an increase in gear mesh noise and gear wear are also reduced.

Furthermore, when the tape cassette 10 is ejected, a positive eject signal pulse is supplied to the base of the transistor 38, so that the transistor 38
is turned on when the tape cassette 10 is ejected, and the integrating capacitor 34 is connected to the transistor 3.
8, the output voltage from the holding circuit 36 disappears, and the transistor 37 is turned off in preparation for loading the next tape cassette.

As explained above, according to the present invention, a switch means connected in parallel to the power switch and a holding circuit are provided, and the switch means is maintained in the ON state for a predetermined period by the output of the holding circuit. When inserting the
Even if there is a time delay between when the first sliding plate reaches the position where the power switch is turned on by the second sliding plate and the power switch is turned on by the second sliding plate, the tape cassette is turned on. There is almost no need to maintain the pushing force applied to the Furthermore, since there is no need to increase the moving speed of the second sliding plate, gear noise does not increase and gear wear does not increase.

Furthermore, since the configuration of the present invention is purely electrical, it can be easily added to the mechanism of a conventional magnetic recording/reproducing device without making any changes.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a tape cassette loading device in a magnetic recording/reproducing apparatus, in which a is a perspective view showing the state at the start of loading a tape cassette, b is an enlarged perspective view of one end of a sliding plate, and c 1 is an enlarged perspective view of a part of the lever, d is an explanatory view showing a sliding plate drive mechanism, and e is a perspective view showing a state in which a tape cassette is being inserted. FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1 and 4... Chassis side plate, 2 and 3... Sliding plate, 5... Power switch, 6... Cam plate, 7 and 1
3...Bending portion, 8, 11 and 17... Rod body, 9...
Cam surface, 10...Tape cassette, 12 and 20
...Coil spring, 14 and 15...Protrusion, 16...Lever, 18...Slope, 19...Recess, 24...Protrusion,
30...Power terminal, 31...Motor drive circuit, 32...
Motor, 34... Integrating capacitor, 36... Holding circuit, 37 and 38... Transistor.

Claims (1)

[Scope of utility model registration request] a first sliding plate that is driven by the pushing force applied to the tape cassette for insertion of the tape cassette to turn on the power switch; and a second sliding plate that has an engaging portion that engages with the first sliding plate. a drive for driving the second sliding plate to a position where the first sliding plate maintains the power switch in an on state; A magnetic recording and reproducing apparatus equipped with a tape cassette loading device having means, comprising a switch means connected in parallel to the power switch, and a time constant circuit to which the voltage outputted via the power switch is supplied. A magnetic recording/reproducing apparatus characterized in that it further comprises a holding circuit that maintains the switch means in an on state for a predetermined period of time using an output voltage.