JPH01204252A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To facilitate a change of the take-up speed for fast forwarding and rewinding by making an electronic control mechanism with a high speed dubbing function, capable of changing a motor rotating speed over to a high speed at the time of the normal fast forwarding or rewinding by pressing the same button again. CONSTITUTION:The title device is constitutive of two sets of the electronic control mechanism 1 and 2 for obtaining a capstan drive and each reel base drive of reproducing, fast forwarding and rewinding by one motor in their system. A motor speed control circuit is utilized for the high speed tape dubbing function between the two mechanisms 1 and 2, and when the fast forwarding and rewinding are performed by a single mechanism, the motor speed is changed over to high speed by operating the fast forwarding and rewinding operation switches 4, 7, 9 and 12 again. By this method, the tape feeding speed for the fast forwarding and rewinding can simply be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording/reproducing device equipped with two mechanisms.

(Prior Art) Conventionally, this type of magnetic recording and reproducing device uses a single motor to drive the capstan at a constant speed, and to drive the reel stand V during recording and playback.
This method drives the reel stand during fast forwarding and rewinding, and the fast forwarding and rewinding speeds were fixed due to constraints in the structure of conventional mechanisms.

(Problem to be Solved by the Invention) However, in the conventional magnetic recording and reproducing apparatus described above, instead of rewinding to the beginning or end of the tape, when the operator wants to fast-forward or rewind the tape, for example, Although it is natural that the faster the removal speed is, the more convenient it is, there is a problem in that realizing this requires the addition of motor speed switching means.

(Means for Solving the Problems) The present invention solves these conventional problems, and is an electronic control mechanism having a high-speed tape copying (dubbing) function, in which the same button is pressed again during normal fast forwarding or rewinding. This device is equipped with means for switching the motor rotational speed to the speed for the aforementioned high-speed tape copying function when is pressed.

(Function) Therefore, according to the present invention, by switching the rotational speed of the motor to the speed for the high-speed tape copying function, the winding speed for fast forwarding and rewinding can be switched between the normal speed and the high speed.

(Embodiment) FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. In Figure 1, 1 is the first mechanism, 2
3 is a control means such as a microcomputer, and 4, 5.6° and 7.8 are the rewinding mechanisms of the first mechanism, respectively.

These are stop, play, fast forward, and @sound operation buttons. 9°10
, 11 and 12 are rewind, stop, play, and fast forward operation buttons of the second mechanism 2, respectively.

13 is a constant speed tape copy button, when operated, the first
Mechanism 1 is put into the recording state and the second mechanism 2 is made into the playback state. Reference numeral 14 denotes a double speed tape copying button, which sets the tape speed to double speed, causing mechanism 1 to record and mechanism 2 to play.

FIG. 2 shows a speed control circuit for a typical electronic governor type motor. In Figure 2, 15 is a monolithic I
Bana circuit (A and B are terminals), 16 is a reference voltage, 17 is a comparator, 18 to 20 are current mirror circuit transistors forming a current proportional circuit, 21
is the motor, 22 is the motor speed control terminal, 23 is the constant current source, 24 is the governor IC ground terminal, 2S is the motor rotation/stop control terminal, 26 is the governor IC power supply terminal, 'l' R1 is the field effect transistor, '1 'R2,'l'' R is a transistor, VR is a semi-fixed resistor, R is a transistor, R is a semi-fixed resistor,
2 is a fixed resistance. Next, the outline of the operation shown in FIG. 2 will be explained. Since the electronic governor system has become common, we will not discuss it in detail. When the current 1a flows through the motor 21, the voltage between the motor terminals is a voltage RaX that changes depending on the motor current 1a.
1a (Ra is the internal resistance of the motor), so a bridge circuit configuration is used and only the motor back electromotive force proportional to the rotational speed is used as the rotational speed signal to control several components.

The motor speed is determined by the resistance value between the A and B terminals of the governor ICl3, and since the speed and resistance value are directly proportional, P
Channeled ET (field effect transistor) 'l'R
Constant speed and high speed are obtained by changing the resistance value using an analog switch. In other words, if the speed switching control terminal 22 is at a high potential, the transistor '1°R2 conducts at a high level, its collector potential becomes close to the ground potential, and the F channel E'r-TR0 becomes non-conductive, causing the aforementioned A The resistance between the terminal and the B terminal becomes R, +VR□, and the motor rotates at high speed. If the speed switching control terminal 22 is at a low potential, 'l'R is non-conductive and TR is conductive, resulting in low rotation between the A terminal and B terminal. Therefore, in reality, if the high speed set speed is 4000 rpm, first adjust it to the desired rotation speed using the semi-fixed resistor VR, then adjust the constant speed set speed to 2000 rpm.
If so, adjust with semi-fixed resistor VR2.

FIG. 3 is a flowchart showing motor speed control according to an embodiment of the present invention, and shows a process controlled by a microcomputer, gate array, etc. shown at 3 in FIG. 1.

Next, motor speed control will be explained with reference to FIGS. 1 to 3. When the second mechanism 2 shown in FIG.
Proceeding to S, the motor is rotated at a constant speed in step S2. Specifically, in Fig. 2, a high potential is applied to the terminal 25 to make the transistor 1'R1 conductive, and the terminal 22 is kept at a low potential, the transistor 1'R2 is made non-conductive, and the field effect transistor 1'R is made to conduct. is considered to be conductive, and the resistance between the A and 13 terminals of the governor ICl3 is determined.Then, proceed to YES in step S3, and in step S4, although not shown in the diagram of mechanism 2, the cam is driven by a means such as a solenoid, and the mechanism is activated. This is used to switch to the playback state. In the regeneration state, it is in a standby state until a stop input is made at judgment Ss, and when the stop operation switch 10 in FIG. Stop and return to the first operator, S-worker.

If the fast-forward operation switch 12 is operated next, judgment is S.
1. The process proceeds to process S2 and judgment S3, and if the judgment S is YES, the process proceeds to process Sg, where the mechanism is switched to a fast-forward state. In this state, the motor rotates at a constant speed, but it is determined that the fast-forward operation switch 12 is operated again. Process with YES
Proceed to □□ and control the motor to double speed rotation. This is the second
In the figure, the terminal 22 is set to a high potential, the transistor 'l゛R2 is made conductive, and the field effect transistor TR1 is made non-conductive.
The resistance between the A and B terminals of the governor ICl3 is set to R + VR, and the semi-fixed resistor VR1 has been adjusted in advance so that the motor rotates at double speed for the purpose of double-speed tape copying, so the magnetic tape can be rotated at twice the normal speed. Can be wound at high speed. It is determined that the fast forward operation switch 12 is kept pressed S1
The loop of 0 and processing S is repeated, but it is determined that the operation of the fast forward operation switch 12 is stopped S□.

If the answer is NO, the process proceeds to step S12, where the terminal 22 is returned to a low potential and the motor is controlled to rotate at a constant speed. If both the stop operation switch 10 and the fast forward operation switch 12 are not operated, the determination is N in S13.

Judgment S engineering. , repeat processing S1□1 judgment S13,
The motor continues to rotate at a constant speed and continues to move rapidly. Also, from this state, whenever the fast-forward operation switch 12 is operated, a loop of processing S1□ and judgment S1o is entered, and the tape is fast-forwarded at f/jA with the motor controlled at double speed, and the tape is played at twice the normal speed. Can be rolled up. In addition, the judgment S operation of the stop operation switch 10 is not performed while the fast-forward operation switch 12 remains pressed. This is because when proceeding to step S5 for operating the stop operation switch 10, normal operation cannot be achieved with a cam type mechanism unless the motor is returned to a constant speed.

When the rewind operation switch 9 is operated, the process proceeds from the judgment Ss to the judgments and processing of Si4 to Si5ill, but since this is the same as in the case of fast forwarding described above, the description thereof will be omitted.

(Effects of the Invention) As is clear from the above embodiments, the present invention comprises two electronic control mechanisms in which a single motor is used to drive the capstan and drive the reel units for playback, fast forwarding and rewinding.
The so-called double mechanism system utilizes a motor speed control circuit for constant speed tape copying function between two mechanisms, and a second fast forward and rewind operation switch when the mechanism is single fast forward and rewind. The speed of the motor can be switched to high speed by operation, and the tape feeding speed for fast forwarding and rewinding, which was conventionally determined by the design of the idler diameter ratio or the rotation ratio of the belt transmission system when driving an idler, can be easily changed. Moreover, as shown in the embodiment, it has the advantage that it can be realized without adding any parts by simply changing the control program of the mechanism control microcomputer or the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a magnetic recording/reproducing device according to an embodiment of the present invention, and FIG. 2 is a motor speed control circuit including an electronic governor type IC (integrated circuit) part according to an embodiment of the present invention. FIG. 3 is a flowchart showing an example of a processing procedure during operation. 1...first mechanism, 2...second mechanism, 3...control means using a microcomputer or the like,
4-8...Operation switch for the first mechanism, 9-
I2... Second mechanism operation switch, 13...
Constant speed tape copying operation switch, 14... Double speed tape copying operation switch, 15... Governor circuit, 16...
Reference voltage, 17... Comparator, 18-20...
Current mirror circuit, 21...Motor, 22...Motor speed control terminal, 23...Constant current source, 24...Governor IC ground terminal, 25...Motor rotation/stop control terminal, 26... Governor IC ground terminal. Patent applicant: Matsushita Electric Industrial Co., Ltd. Mulberry I go in, Su 6-Bird 1 Mechani Wb A earth manipulation I 乍 Sui 7 Su 7- Series 1 Menojizu △
Early Ruri J Kume I, 7 children 8-1's Mekuni O,,, Atsushi 2's Meknis ° L (1) Shuttle stop, give in, 2 children + L% 2's me η 2 XL re-i operation enter I 1
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Memochi Sadahosen 25. -Senichi Taro Inui/Azusa Dose 1 Loose 126
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Claims (1)

[Claims] It is equipped with two electronically controlled mechanisms, and has constant speed and high speed tape copying functions between the two mechanisms, and both of the two mechanisms have capstan drive, fast forward and fast forward during playback and recording. The reel stand on the take-up side is driven by the same motor during rewinding, and when the fast-forward and rewind buttons are operated, the motor rotates at the speed used for playback and recording, and in that state, the reel table is fast-forwarded or rewinded again. 1. A magnetic recording and reproducing apparatus, characterized in that when a button is operated, the motor is controlled to a rotational speed for high-speed tape copying.