JPS60254441A - Tape recorder device - Google Patents

Abstract

PURPOSE:To eliminate the necessity of the capstan and pinch roller from a tape recorder device so as to simplify the constitution of the device, by detecting rotating speeds of a motor for running tape and pair of reels and operating the difference component of the rotating speeds of the pair of reels, and then, controlling the rotating speed of the motor so that the running speed of a tape can be fixed constantly. CONSTITUTION:Driving idlers 17a and 18a of both reels 17 and 18 are respectively equipped with speed detectors 38 and 38 and rotating speeds of the idlers 17a, and 18a, namely, rotating speeds of the reels 17 and 18 are detected. Pulse signals outputted from both speed detectors 38 and 39 are supplied to an arithmetic circuit 40 where the difference component of the rotating speeds of the reels 17 and 18 is operated. By taking factors, such as diameters of reel hubs 16b and 16c of a tape cassette 16, thickness of a tape 16a, etc., into consideration in addition to the difference component, a voltage signal corresponding to the running speed of the tape 16a passing through a recording/reproducing head 12a is outputted and the rotating speed of a reel motor 19 is controlled.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tape recorder device, and in particular, it has a new configuration that eliminates the need for a cab stun and pinch rollers for running the tape at a constant speed. This invention relates to a device designed to further reduce size, weight, and current consumption.

[Technical background of the invention]

As is well known, examples of so-called tape recorders that record and reproduce information using tape as a recording medium include compact cassettes, tote recorders, and four-microphone cassette tape recorders.

Many products have been developed, such as open-reel tape recorders, rotating head type and fixed head type video tape recorders, and PCM () electric cord modulation) electric and I-. By the way, the above-mentioned tape recorder uses a head to record and reproduce information on the tape, and during this recording and reproduction, it is necessary to keep the running speed of the tape constant as it passes through the front and rear ends.

For this reason, conventionally, the rotational speed of the motor is made constant using a flywheel, the rotational force of the flywheel is transmitted to the capstan, and a tape is placed between the capstan and the pinch row 2 that is pressed against the cabstan. By sandwiching the tape, it is possible to run the tape at a constant speed relative to the head.

[Problems with background technology]

However, in the conventional means for running the tape at a constant speed as described above, lateral pressure is applied to the capstan due to the pinch roller being pressed against it, and the amount of rotation of the capstan against this lateral pressure is The rotational torque of the motor must be increased, which increases current consumption. In addition, since the tape is forced to run at a constant speed using the capstan and pinch ruler, the reel that takes up the tape requires a clutch structure, etc., which complicates the configuration. The load applied to the reel drive motor is also large due to the clutch structure described above, which also increases current consumption.

Furthermore, considering the energy required to rotate the flywheel, carburetor tongue, and pinch roller themselves, and the loss of rotational force due to friction in their bearings, an extremely large amount of current is consumed.

In addition, the flywheel needs to have a large amount of inertial energy in order to keep the rotational speed of the capstan constant, but this requires a flywheel that is heavy and has a large diameter. This poses a problem in that it impedes expansion and reduction in size and weight in tote recorders and the like.

[Purpose of the invention]

This invention has been made in consideration of the above circumstances, and has an extremely good tape recorder that has a new configuration that eliminates the cab's tongue and Gunchi O-2, and can simplify the configuration and significantly reduce current consumption. The purpose is to provide equipment.

[Summary of the invention]

That is, the tape recorder device according to the present invention includes a motor for running the tape, first and second speed detectors that respectively detect the rotational speed of a pair of reels, and the first and second speed detectors. and a control means for calculating a difference component between the rotational speeds of the pair of reels based on the detection signal and controlling the rotational speed of the motor so that the chive running speed is constant. It has a new configuration that eliminates pinch rollers and the like, making it possible to simplify the configuration and significantly reduce current consumption.

[Embodiments of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing one embodiment of the present invention, the basic structure of a cassette tag recorder to which the present invention is applied will be described below with reference to the drawings. In FIG. 4, reference numeral 11 denotes a substantially flat main chassis. A head chassis 12 on which a recording/reproducing head (hereinafter referred to as recording/reproducing head) 12a is mounted is supported at approximately the center of the main chassis 11 so as to be slidable in the directions of arrows A and B in the figure. The main chassis 12 is normally biased in the direction of the arrow B in the figure by a spring 12b, and is moved in the direction of the arrow A in the figure in conjunction with the operation of a playback operator (not shown).
The recording/reproducing head 12a comes into contact with the tape, which will be described later.

The main chassis 11 also includes a head chassis 1.
2, the speed detection slider 13 is aligned with the arrows A and B in the figure.
It is supported so that it can slide freely in the direction. A speed detector 14 is attached to a screw 13a on the lower surface of one end of the speed detection slider 13 in the figure.

It is installed by JJb. Note that the speed detector 14 is connected to a through hole 11m formed in the main chassis 11.
When inserted loosely, the movement of the speed detection slider 13 is not obstructed.

The speed detection rotating shaft 14a of the speed detector 14 is
The through hole 13c formed in the speed detection slider 13 is loosely inserted, and the roller 14b is inserted on the upper surface side of the slider 130 in the figure.
is attached to.

This four-ra 14b is located at a position opposite to a pinch roller insertion hole formed in a conno-branch totege cassette (hereinafter referred to as a tape cassette) to be described later, and the speed detection slider 13 is rotated by the biasing force of a spring 13d. When it is moved in the direction of the middle arrow A, it is inserted through the pinch roller insertion hole and comes into contact with the teno. Further, the other end of the speed detection slider 13 is provided with a force which will be described later.

A retaining portion 13e that engages with the set holder is formed.

Here, as shown in FIG. 5(,), a cassette holder 15 is installed at the end of the main chassis 11 opposite to the side where the roller 14b, the recording/reproducing head 121, etc. are arranged. ing. The cassette holder 15 is configured to hold the end of the tape cassette 16 on the side (hereinafter referred to as the back side) where an unillustrated erase prevention claw is formed in the thickness direction of the tape cassette 16.

The cassette holder 15 is rotatably supported by support pieces 11b protruding from the main chassis 11 at both sides, so that it can rotate in the directions of arrows C and D in the figure. E) The tape cassette 16 can be attached and detached while being rotated in the direction of the arrow in the figure.

Further, a cam portion 15a that is engaged with the retaining portion 13e of the speed detection slider 13 is formed at the end of the cassette holder 15 that faces the retaining portion 13e of the speed detection slider 13. This cam portion 15m, as shown in FIG. 5(,),
With the cassette holder 15 being rotated in the direction indicated by the arrow in the figure, the speed detection slider 13 is moved in the direction indicated by the arrow B in the figure against the biasing force of the spring 13d.

Then, when the rear end of the tape cassette 16 is inserted into the cassette holder 15 and the cassette holder 15 is rotated in the direction of arrow C in the figure, as shown in FIG. The slider 13 is a tape cassette 16
With the pin-shaped roller insertion hole facing the roller 14b, it is moved in the direction of arrow A in the figure by the biasing force of the spring 13tl along the cam portion 15h. Therefore, the roller 14b is brought into contact with the tape (not shown) through the pinch roller insertion hole of the tape cassette 16. Therefore, when the tape cassette 16 is in the installed state as shown in FIG. 5(b), the row 214b always comes into contact with the tape.

Further, when the cassette holder 15 is rotated in the direction of the arrow in the figure with the tape cassette 16 mounted as shown in FIG. is moved in the direction of arrow B in the figure. Therefore, the roller 14b is pulled out from the pinch roller insertion hole of the tape cassette 16 and returned to the state shown in FIG. 5(,).

Here, FIG. 6 is a plan view showing the mounted state of the tape cassette 16 shown in FIG. 5(b). That is, the row 214b is in contact with the tape 16a inside the tape cassette 16. Note that the brass head 12& is not in contact with the tape 16m unless the playback operator is operated. The main chassis 11 also includes a pair of reel hubs 1 of the tape cassette 16.
A pair of reels 17 and 18 fitted to the reels 6b and 16c are rotatably supported, respectively. These reels17.
18, drive idlers 17a and 18m are provided coaxially and integrally, respectively.

Of the main chassis 11, both reels 17
．． A reel motor 19 is installed on a substantially perpendicular bisector of a line segment connecting the rotation centers of the reel motor 18. The reel motor 19 is of a DC voltage drive type, and its rotational speed is changed depending on the magnitude of the applied DC voltage level. One end of the relay lever 20 is rotatably fitted onto the rotating shaft 19m of the reel motor 19. Further, the rotating shaft 19m and the relay lever 20 are interlocked with each other with some frictional force.

Further, a relay idler 21 is rotatably supported at the other end of the relay lever 2o.

This relay idler 21 is connected to the rotation shaft 1 of the reel motor 19.
9*, and is connected so as to be able to transmit rotational force.

Then, when the rotation shaft 19h of the reel motor 19 is rotated counterclockwise in FIG. 6, the relay lever 20 is rotated counterclockwise in FIG.
1 comes into contact with the drive idler 18m of the reel 18. Therefore, the rotational force of the reel motor 19 is transmitted to the reel 1 through the relay idler 21 and the drive idler 18a.
8, the reel 18 is rotated counterclockwise in FIG. 6, and the tape 16m is now run rightward in FIG.

Further, when the rotation shaft 19 of the reel motor 19 is rotated clockwise in FIG. 6, the relay lever 20 is rotated clockwise in FIG. It comes into contact with the drive idler 27a. Therefore, the rotational force of the reel motor 19 is transmitted to the reel 17, and the reel 17 is rotated clockwise in FIG. 6, causing the tape 16a to run to the left in FIG. be.

That is, by changing the rotation direction of the reel motor 19, the running direction of the tape 16a can be changed, and by changing the rotation speed of the reel motor 190, the running speed of the tape 16a can be changed. It is.

Here, the tape recorder explained with this basic configuration has playback, recording, fast forwarding and rewinding.

Various operators such as stop and pause (pause) have a touch switch structure, and when any of the operators is operated, it is determined by an LSI (Large Scale Integrated Circuit) dedicated to controlling the tape recorder, and the operation is performed. The controller is controlled to be in an operating state or a stopped state corresponding to the selected operator. In addition, this cassette tape recorder has an automatic stop (ASO) function that automatically stops when the Q 7016a reaches the end, and a tape 16 &
It is equipped with an auto-reverse function that automatically reverses the tape constant-speed running direction when it reaches the end. For this reason,
There are two types of playback controls: a forward (rightward) playback control and a reverse (leftward) playback control.

For example, when a forward playback operator is operated, the LSI outputs a forward playback signal Fd corresponding to the operation. Then, although the details will be described later, the reel motor 19 is rotated at low speed counterclockwise in FIG.
h starts to run rightward in FIG. At this time, since the roller 14b is rotated by the running of the tape 16g, the speed detector 1 detects the rotation of the roller 14b.
4 detects the running speed of the tape 16a, and based on the detection result, the rotational speed of the reel motor 19 is controlled so that the running speed of the tape 16h is constant, and in particular, forward direction playback is performed. It is.

Further, when the reverse playback operator is operated, the LSI outputs a reverse playback signal (Rev,), and the reel motor 19 is rotated at low speed clockwise in FIG. The vehicle will now run to the left in Figure 6.

At this time as well, the rotational speed of the reel motor 19 is controlled so that the running speed of the tape 161L is constant based on the detection result of the speed detector 14, and reverse direction playback is performed. It is.

Here, the recording state is achieved by operating both the recording operator and the forward or reverse playback operator. In this case, the tape recorder circuit unit (not shown) is simply switched to the recording state by operating the recording operator, and the tape 16h is run at a constant speed in the forward or reverse direction in the same manner as described above, and the tape 16h is run at a constant speed in the forward or reverse direction. This is a backward vowel.

Furthermore, when the fast-forward operation element is operated, the LSI outputs a fast-forward signal FF, which causes the reel motor 19 to rotate at high speed in the counterclockwise direction in FIG. 6. For this reason, the vehicle f16* is moved at high speed to the right in FIG. 6, and fast forwarding is performed here. Furthermore, when the rewind operator is operated, the LSI
A rewind signal (REW) is output from , and the reel motor 19 is rotated at high speed clockwise in FIG. Therefore, the tag 16a is moved at high speed to the left in FIG. 6, and rewinding is performed here. Note that even in such a high-speed tape running state, the roller 14b is rotated by the tape running, but the rotational speed of the reel motor 19 is not controlled.

Then, when the tape 16a reaches the end in the tape constant speed and high speed running state described above and the tape running is stopped,
The rotation of roller 14b is also stopped. Therefore, in this cassette tape recorder, the end of the tape is detected by stopping the rotation of the roller 14b.

Furthermore, when the stop operator is operated in the above tape constant speed and high speed running state, the above LSI outputs each signal F d, Rev
, F F , and REV are stopped, thereby stopping the rotation of the reel motor 19 and stopping the tape running. Further, when the pause operator is operated while the tape is running at constant speed, the LSI continues to generate the signal Fdi or Rev, but at the same time cuts off the power supply to the reel motor 19 and temporarily stops the tape from running at constant speed. It is something that makes you

Here, FIG. 7 shows details of the speed detector 14. First, the row 214b is composed of a cylindrical mounting member 14c that is fitted onto the speed detection rotating shaft 14&, and a contact member 14d that is fitted to the mounting member 14c so as to cover its circumferential surface. ing. This contact member 1
4d is made of a material (for example, rubber) that has an appropriate frictional force with the tape 16& so that the roller 14b can be rotated without slipping as the tape runs.

Further, the lower portion of the speed detection rotating shaft 14a in the figure passes through a bearing portion 14f provided on the shaft support 14e, and is fitted onto a disc-shaped rotor magnet 14g. This rotor magnet) 14g has an S pole and an N pole along its circumferential surface.
The roller 14b is one in which poles are alternately formed.
It is rotated integrally with the Then, the stator coil 1 is placed so as to cover the circumferential side of the rotor magnet J4g.
4h is installed and supported by the shaft support 14e. As shown in FIG. 8, the stator coil 14h has two disc-shaped parts into which the rotor magnet 14g can be fitted loosely.
A coil 14k is wound between two stators 141 and 143 along the circumferential surface thereof.

Here, the inner peripheral portions of the stators J4i and 14j include:
A plurality of tongue pieces 14t at predetermined intervals.

Each length of 14 m is bent to look like a grain. The stators 14 l and ' 14 j are placed opposite each other so that their tongues 14 L t 14 m are alternately combined to form a so-called FG pattern. Therefore, when the rotor magnet 14g is rotated, an FG pulse signal having a frequency corresponding to the rotational speed is generated from the coil 14k, and the tape running speed is detected from this signal.

In ζζ, FIG. 9 shows a means for controlling the rotational speed of the reel motor 19 to run the tape 16 m at a constant speed based on the FG/4 pulse signal output from the speed detector 14. It is. Now, assuming that the tape 16n is in the forward playback state, first, the speed detector 14
The 9FG/4' pulse signal outputted from is amplified by the amplifier circuit 22 and then supplied to the discriminator 23.
It is converted into a voltage signal corresponding to that frequency. This voltage signal is applied to one input terminal of a comparison circuit 26 via a low-pass filter 24 and a cutoff switch 25.

Here, the cutoff switch 25 is connected to the fast forward multi-signal FF.
Alternatively, when the rewinding signal R11W is supplied via the OR circuit OR1, the loaf 4 filter 2 to the comparison circuit 26
In this case, since it is a forward playback state, the fast forward and rewind signals F F ,
Since neither REV is generated, they are in a conductive state, and the voltage signal output from the low/base filter 24 is supplied to the comparison circuit 26.

The reference voltage output from the reference voltage generation circuit 27 is applied to the other input terminal of the comparison circuit 26.

This reference voltage is set in advance at a level corresponding to rotationally driving the reel motor 19 so as to run the tape 16h at a constant reference speed, and the comparison circuit 26 receives the voltage applied via the cutoff switch 25. The signal is compared with the reference voltage, and a voltage signal corresponding to the difference component is added to the reference voltage to output a voltage signal. The voltage signal output from the comparison circuit 26 is supplied to a polarity inversion circuit 30 via an amplifier circuit 28 and a drive circuit 29.

This polarity reversing circuit 30 is a drive circuit configured to rotate the reel motor 19 counterclockwise in FIG. 6 when the forward reproduction signal Fd or the fast forward signal FF is supplied via the OR circuit OR2. The polarity of the output voltage from 29 is controlled, and the reverse playback signal Rev or the expanded rewinding signal R
When E91/ is supplied via the OR circuit OR, the polarity of the output voltage from the drive circuit 29 is controlled so as to rotate the reel motor 19 clockwise in FIG. 6, and the tape running direction is determined. In this case, since the forward direction playback state is in effect, the forward direction playback signal Fd is output, so the polarity is controlled so that the reel motor 19 is rotated counterclockwise in FIG.

Then, the voltage signal whose polarity is controlled by the polarity reversing circuit 30 is supplied to the reel motor 19, where the tape 1
The rotation direction and rotation speed of the reel Tanabata 19 are controlled so that the reel 19 travels at a constant speed of 6 m in the forward direction at a reference speed.

In addition, when the tape 16m is in the reverse direction regeneration state,
Since the reverse direction reproduction signal Rev is output, the reel motor 19 is controlled to rotate clockwise in FIG. This is where the river is controlled in such a way that it moves in the opposite direction.

Incidentally, it goes without saying that the same control as described above is applied to the reel motor 19 also when the control f 16 m is in the forward direction recording and reverse direction recording states.

Furthermore, when the tape 16h is in the fast-forward or rewind state, the fast-forward signal FFi or the rewind signal R is generated, so the cutoff switch 26 is driven and the output of the low-pass filter 24 is Since the signal is not supplied to the comparator circuit 26, the rotational speed control of the reel motor 19 as described above is not carried out, and the reel motor 19 is rotated at high speed, thereby causing the tape to run at high speed.

In this case as well, the fast forward signal FF and the rewind signal R
It goes without saying that 111W is supplied to the polarity inversion circuit 30 to determine the rotation direction of the reel motor 19.

Here, in the tape constant speed and high speed running state as described above, the p Q I pulse signal outputted from the speed detector 14 passes through the amplifier circuit 22 and then is rectified by the rectifier circuit 31. The voltage level is converted into a voltage level and supplied to the switch circuit 33. This switch circuit 33 is driven when the voltage level output from the integrating circuit 32 becomes below a predetermined level, and shuts off the amplifier circuit 28 to prevent the output of the comparison circuit 26 from being supplied to the drive circuit 29. It is something.

Therefore, when the tape 16a is running at a constant speed or high speed, the FG pulse signal continues to be generated from the speed detector 14, so that the output voltage level from the integrating circuit 32 is set to a predetermined level by the switch circuit 330. The voltage does not drop below the level, the amplifier circuit 28 is not cut off, and stable tape running is performed.

When the tape 16& reaches the end in such a tape running state and the rotation of the roller 14b is stopped, the FG pulse signal is no longer generated from the speed detector 14, and the output voltage level of the integrating circuit 32 becomes the predetermined level. decreases below. Then, the switch circuit 33 turns off the amplifier circuit 28 and cuts off the power supply to the reel motor 19.

Therefore, the rotation of the reel motor 19 is stopped, and the rotation of the reel motor 19 is stopped.
16& is stopped and an automatic stop is performed at this point.

Here, this cassette tape recorder is provided with a changeover switch for selecting an automatic stop function and an autoreverse function, and this changeover switch is connected to the LSI. Further, the output of the integrating circuit 32 is also connected to the LSI. If the changeover switch is switched to the automatic stop function side, the automatic stop will be performed when the running tape 16m reaches the end, as described above.

In addition, if the changeover switch is set to the auto-reverse function side, for example, the tape 16a is in the forward playback state.
When reaches the end of the tape, the LSI determines the end of the tape based on the drop in the output voltage level of the integrating circuit 32, automatically outputs the reverse playback signal Rev, and puts the Q f 16 m into the reverse playback state. The auto-reverse function is performed. In this case, the amplifier circuit 28
It is controlled by the action of SI so that it does not become in a cut-off state. Furthermore, even if the changeover switch is switched to the auto-reverse function side, the LSI controls the tape so that the automatic stop described above is performed when the tape 16g reaches the end when the tape is running at high speed.

Therefore, according to the above-mentioned basic configuration, the cab tongue, pinch roller, etc. are abolished, and the speed detector 14 is used to detect the tape 16.
Since the running speed of tape a is detected and the rotational speed of the reel motor 19 is controlled based on the detection result so that the tape running speed remains constant, it is not necessary to provide a capstan, a pinch roller, etc. as in the conventional case. All of the various problems caused by this can be solved, the structure is simple and suitable for downsizing and weight reduction, and in particular, the current consumption in the reel motor 19 can be significantly reduced.

Also, the date for detecting the running speed of the tape 161L is
Since the end of the tape is detected using the stoppage of generation of the FG pulse signal from the speed detector 14 due to the stoppage of rotation of I7b, there is no need to separately provide a mechanism for detecting the end of the tape. The configuration can also be simplified in some respects.

Furthermore, the tape o16& can be run in the forward and reverse directions only by electrical means for switching the rotational direction of the reel motor 19, and by electrically controlling the rotational speed of the reel motor 19, the tape can be run at a constant speed. Since it is possible to perform 71 things, the auto-reverse function can be realized with a simple configuration.

In the above basic configuration, the tape 16m is run at a constant speed only during recording and playback, but by using the means shown in FIG. 10, the tape 16h is run at a constant speed even during fast forwarding and rewinding. It can run at high speed.

That is, the cutoff switch 25 is eliminated and the output of the low/low pass filter 24 is directly supplied to one input terminal of the comparison circuit 26. The other input terminal of the comparator circuit 26 has
The reference voltages output from the reference voltage generation circuits 34 and 35 are selected and supplied by the switching circuit 36. This switching circuit 36 switches so that the reference voltage output from the reference voltage generation circuit 34 is applied to the comparison circuit 26 when the fast forward signal FF or the rewind signal Rw is supplied via the OR circuit OR. When the forward reproduction signal Fd or the reverse reproduction signal Rev is supplied via the OR circuit OR, the reference voltage outputted from the reference voltage generation circuit 35 is switched to be applied to the comparison circuit 26. It is something that will change.

The reference voltage output from the reference voltage generation circuit 34 is set to a level corresponding to rotationally driving the reel motor 19 so as to run the tape 16h at high speed, and is output from the reference voltage generation circuit 35. The reference voltage is set at a level that drives the reel motor 19 to rotate so that the tape 16& is run at a constant speed corresponding to recording and playback.

Therefore, during recording and playback, the rotational speed of the reel motor 19 is controlled as described above based on the reference voltage output from the reference voltage generation circuit 35, and during fast forwarding and rewinding, the rotation speed is controlled from the reference voltage generation circuit 34. The rotational speed of the reel motor J9 is now controlled based on the reference voltage, so that the tape running speed can be kept constant even when the tape is running at high speed.

Further, the speed detection slider 13 may be linked with an ejection lever 37 as shown in FIG. 11. That is, in this case, when the jug lever 37 is rotated in the direction of arrow E in the figure, the speed detection slider 13 is moved in the direction of arrow B in the figure. In this case, as shown in FIG. 12(, ), the end of the cassette holder 15 facing the retaining part 13e of the speed detection slider 13 is provided with an inclined part isb instead of the cam part 15a described above. A recessed portion 15c is formed. When the cassette holder 15 is rotated in the direction of the arrow in the figure, the speed detection slider J
3, its engaging portion 13e is pushed by the inclined portion 15b and is moved in the direction of arrow B in the figure.

Here, when the tape cassette 16 is attached to the cassette holder 15 and the cassette holder 15 is rotated in the direction of arrow C in the figure as shown in FIG. 13m enters into the recess 15a and is moved in the direction of arrow A in the figure, so that the roller 14b comes into contact with the chive 16a. In this state, the cassette holder 15 has its concave portion 15c aligned with the engaging portion 1.
3e, it is held so as not to be inadvertently rotated in the direction of the arrow in the figure.

Furthermore, when the ejector lever 37 is operated, the speed detection slider 13 is moved in the direction of arrow B in the figure, and at this time, the cassette holder 15 can be rotated in the direction of the arrow in the figure, and the tape cassette 16 can be removed. It is something that you will be able to do.

Furthermore, as shown in FIGS. 13(-) to (c), the tape running state can be easily checked by marking the roller 14b with various patterns. In this case, the pattern shown in Figure 13 (,) is marked with a substantially spiral pattern, the pattern shown in Figure 13 (b) is coded in three different colors, and the pattern shown in Figure 13 (C) The one shown in the figure has a substantially radial pattern.

In addition, in the tape end detection means described above, the speed detector 1
However, in this cassette tape recorder, when the tape 16m reaches the end and tape running is stopped, the rotation of the reel motor 19 is also forced. Since the rotation of the reel motor 190 is stopped temporarily, the end of the tape may be detected using this stoppage of rotation of the reel motor 190.

Furthermore, as a means for detecting the tape running speed, in addition to the above-mentioned speed detector 14 that uses an FG pattern, for example, a plurality of sleds that rotate in conjunction with the tape running and are formed along a curved surface may be used. Various means can be used, such as an optical detection means in which a light emitting part is installed on one side of a disk and a light receiving part on the other side, or a capacitance type detection means. As a motor for running the tape 16a, in addition to using the reel motor 19 described above, a so-called direct drive DD system in which the rotating shaft of the reel 17, 18 is directly connected to the motor, for example, may be used. Of course, the rotation speed may be controlled.

In a cassette tape recorder having the basic configuration as described above, one embodiment of the present invention will be described in detail below with reference to the drawings.

In other words, as shown in FIG.
A rotation speed of 7.18 is detected. Here, FIG. 2 shows the specific configuration of the drive idler 17a and the speed detector 38, and since the specific configurations of the other drive idler 18a and the speed detector 39 are the same, The explanation will be omitted.

That is, as shown in FIG. 2(,), the drive idler 17m is provided with a friction member 17b on its outer periphery that comes into contact with the relay eye 221. In the drive idler 17a, a plurality of slits 17c are formed along the inner circumferential side of the friction member J7b.

Further, as shown in FIG. 2(b), the speed detector 38 has a light emitting section 38m and a light receiving section 38b.
The irradiated light from a passes through the light receiving section 38b through the slit) 17c.
It is designed so that it can receive light. Therefore, when the drive idler 17a is rotated, a pulse signal having a frequency corresponding to the rotational speed is output from the light receiving section 38b, and the rotational speed of the reel 170 is detected here.

The Noyals signals output from both speed detectors 38 and 39 are supplied to an arithmetic circuit 40, as shown in FIG. This arithmetic circuit 4° calculates the difference component between the rotational speeds of both reels 17.1B, and takes into consideration factors such as the diameters of the reel hubs 16b and 16c of the tape cassette 16 and the thickness of the tape 16m. , pre-record re-head 1
2& outputs a voltage signal corresponding to the running speed of the tape 16m passing through. And the voltage signal with is
The signal is supplied to the comparator circuit 26 via the cutoff switch 25, and thereafter the rotational speed of the reel motor 19 is controlled in the same manner as described above.

Further, the pulse signal output from the speed detector 39 is supplied to the rectifier circuit 31 and used for detecting the end of the tape, but the pulse signal output from the speed detector 38 may also be used for this purpose. Of course.

Therefore, according to the configuration of the above embodiment, the tape running speed is calculated from the rotational speed of both reels 17 and 18, and there is no need to separately provide the speed detector 14 as in the above basic configuration. Therefore, it is possible to further simplify the structure, reduce size and weight, and further promote the reduction in size and weight. In addition, the means for detecting the rotational speed of the reel 17.11J is not limited to the above-mentioned optical means, but may also be a magnetic detection means or a capacitance type means like the speed detector 14 described above. .

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

〔Effect of the invention〕

Therefore, as detailed above, according to the present invention, there is provided an extremely good tape recorder device which has a new configuration that eliminates the cab stun, pinch row 2, etc., and which can significantly reduce current consumption even if the configuration is simplified. can be provided.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a tape recorder device according to the present invention, FIG. 2 is a configuration diagram for explaining the main parts of the embodiment, and FIG. 3 is a diagram for explaining the operation of the embodiment. 4 and 5 respectively show the basic structure of a cassette tape recorder to which the present invention is applied. 6 is a plan view for explaining the operation of the same basic configuration, FIGS. 7 and 8 are velocity products of the same basic configuration, respectively. 9 FIG. 9 is a block configuration diagram showing a reel motor rotation speed control means of the same basic configuration. Figure 10 shows fs
Figures 11 and 3g12 are partially modified perspective views and side views of the speed detection slider and cassette holder having the same basic configuration, respectively. 13 are plan views showing a partially modified speed detector having the same basic configuration. DESCRIPTION OF SYMBOLS 11... Main chassis, 12... Bed chassis, 13... Speed detection slider, 14... Speed detector, 15... Cassette holder, 16... Tape cassette, 17.18... - Reel, 19... Reel motor, 20... Relay lever, 21... Relay idler, 22... Amplifier circuit, 23... Discriminator, 24... Low pass filter, 25... Cutoff switch, 26... Comparison circuit, 27... Reference voltage generation circuit, 28... Amplification circuit, 29... Drive circuit, 30
...Polarity reversal circuit, 3... Rectifier circuit, 32...
Integrating circuit, 33... Switch circuit, 34, 35...
・Reference voltage generation circuit, 36... switching circuit, 37...
Eject lever, 38.39...Speed detector, 40
...Arithmetic circuit. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 2a Figure 4Δ Figure 51!1 (b) Figure 6 Figure 7 Figure 8 Figure 14 Figure 9 Figure 10 Figure 11 Δ Figure 12 5b 13th vgi (a) (b) (c)

Claims (1)

[Claims] a motor for running the tape; first and second speed detectors each detecting the rotational speed of the pair of reels;
and a control means for calculating a difference component between the rotational speeds of the pair of reels based on a detection signal from a second speed detector to control the rotational speed of the motor so that the tape running speed is constant. A tape recorder device characterized by: