JPH0320902Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an azimuth adjustment device for a magnetic head in an auto-reverse type tape recorder.

In auto-reverse type tape recorders,
It is known that the tape running paths are not the same when running in the forward direction and in the reverse direction, and for this reason, the azimuth position of the reproducing head, which is precisely aligned when the tape is running in the forward direction, is It becomes crazy when driving in direction.

On the other hand, devices conventionally proposed as azimuth adjustment devices divide and reproduce the signal recorded on one track on the tape, detect the phase shift between the divided reproduction signals, and automatically control the magnetic head. There are devices that perform azimuth adjustment and devices that perform azimuth adjustment by manually operating the adjustment screw of an azimuth adjustment mechanism.

However, the former type requires a special configuration for the head itself, which is extremely complicated and costly, and the latter type requires tools such as a screwdriver to operate the adjustment screw. In addition, since the adjustment screw is located inside the tape recorder, there is a drawback that adjustment operations are not easy.

Particularly in the latter case, there is a problem in that the reference azimuth position of the head is not known, and when playing back various tapes, it is difficult to accurately adjust the azimuth for each tape run or even for each tape. , the adjustment work becomes extremely complicated.

The present invention eliminates the above-mentioned drawbacks, and embodiments thereof will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of the device of the present invention.

Between power supply +E and -E, variable resistor 1 ₁ and variable resistor 1 are connected.
₄ are connected in series, and variable resistor 1 ₂ and variable resistor 1
₅ , variable resistor ₁₃ , and resistor 2 are similarly connected in series. The movable terminal _T4 of variable resistor ₁₄ is connected to the connection point of variable resistor ₁₁ and variable resistor ₁₄ , and the movable terminal _T5 of variable resistor ₁₅ is connected to the connection point of variable resistor ₁₂ and variable resistor ₁₅ , respectively. has been done. Also variable resistance 1 ₁
The movable terminal T ₁ is one fixed terminal 3 ₁ of the switch 3
The movable terminal T ₂ of the variable resistor 1 ₂ is connected to the other fixed terminal 3 ₂ . The movable terminal ₃₃ of the switch 3 is connected to one input terminal ₄₁ of the differential amplifier 4, and the movable terminal _T3 of the variable resistor ₁₃ is connected to the other input terminal ₄₂ . Here variable resistor 1
₁ , 1, _{and 2} are used to adjust the azimuth when the tape runs in the forward and reverse directions, respectively, so their respective variable operation parts are protruded from the operation panel of the tape recorder, and the operation knobs (Fig. (not shown) is attached, and a center
A click is provided. Furthermore, the movable terminal _T3 of the variable resistor ₁₃ is configured to be interlocked with the rotation of a control motor 5, which will be described later, and the movable terminal T3 of the switch 3 is
₃ is switched and controlled in response to reversing means 6 for switching the running direction of the tape.

The differential amplifier 4 controls the rotation of the control motor 5 based on the difference between the voltages applied to its input terminals 4 ₁ and 4 _2. When the voltage at the input terminal 4 ₁ is higher than the voltage at the input terminal 4 ₂ The control motor 5 is rotated in the forward direction, when the voltage is low, the control motor 5 is rotated in the reverse direction, and when both voltages become equal, the rotation is stopped. A well-known azimuth adjustment mechanism 7 changes the azimuth of the playback head 8 clockwise or counterclockwise in response to the rotation of the control motor 5. For this azimuth adjustment mechanism, reference may be made to, for example, Utility Model Publication No. 1982-014424 filed by the present applicant.

Variable resistors 1 ₄ and 1 ₅ are used to set the reference azimuth position when the tape runs in the forward and reverse directions, respectively.
The resistance value is such that when the variable resistors 1 ₁ and 1 ₂ are at the center click position, the azimuth of the reproducing head 8 is in the correct azimuth state with respect to, for example, a reference tape (not shown) for azimuth adjustment. It is preset to take the reference azimuth position.

With the above configuration, when the variable resistors 1 ₁ and 1 ₂ are manually set to the center click position, the movable terminal 3 ₃ of the switch 3 is connected to the fixed terminal 3 ₁ in the positive direction of the tape. When driving,
The playback head 8 assumes the standard azimuth position when traveling in the forward direction, and when the tape runs in the reverse direction where the movable terminal ₃₃ is connected to the fixed terminal ₃₂ , the playback head 8 assumes the standard azimuth position.
takes the reference azimuth position when traveling in the reverse direction, and when variable resistors 1 ₁ and 1 ₂ are removed from the center click position and manually operated when traveling in the forward and reverse directions, the positions are adjusted according to the change in resistance value. This makes it possible to change the azimuth state of the reproducing head 8 at will.

Therefore, a tape recorder incorporating the device of the present invention
When actually playing back a tape on a tape player, while listening to the playback sound, press the operation knob on the operation panel of variable resistor 1 when the tape is running in the forward direction, and press the operation knob on the operation panel of variable resistor ₁ when the tape is running in the reverse direction. Change the azimuth of the playback head 8 by moving the control knob on the control panel of 1 _{and 2} , and set the control knob to the position that provides the best audible playback characteristics. can be set almost correctly.

Furthermore, when tape reproduction is finished, the reproduction head 8 can be returned to the standard azimuth position at any time by setting this operating knob to the midpoint click position.

The present invention is not limited to the above-mentioned embodiment, but it is also possible to manually adjust the azimuth in the forward and reverse directions using one variable resistor ₁₆ , as in another embodiment shown in FIG. 2, for example. In FIG. 2, the same components as in the embodiment of FIG. 1 are designated by the same numbers. Furthermore, it can be applied to an azimuth adjustment device for a recording head or a recording/playback head, and the variable resistors 1 ₁ and 1 ₂ may be provided not on the operation panel but on a remote controller to enable remote control. Of course, this can take various forms.

According to the present invention described above, it is possible to realize an azimuth adjustment device that is excellent in terms of cost and operability. Also,
According to the present invention, when the operation knob on the operation panel is set at a substantially intermediate position in the movable range, the reference azimuth of the magnetic head is switched corresponding to when the tape is running in the forward or reverse direction, and When playing back a tape that was recorded by a tape recorder with a misaligned recording azimuth, change the azimuth of the magnetic head by moving the control knob while listening to the playback sound to find the playback characteristics that give the best audibility. If you set it in a good position, you can set the azimuth of the magnetic head correctly relative to the tape being played, and when tape playback is finished, you can set the control knob to approximately the middle position to set the magnetic head. It can be returned to the standard azimuth position at any time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing another embodiment of the present invention. 1 ₁ to 1 ₆ ... Variable resistor, 2 ... Resistor, 3 ... Switch, 4 ... Differential amplifier, 5 ... Control motor, 6
...Reversing means, 7... Azimuth adjustment mechanism, 8...
Play head.

Claims (1)

[Claims for Utility Model Registration] The standard azimuth of the magnetic head is switched in accordance with the forward and reverse directions of the magnetic tape, and
A magnetic head azimuth adjustment device in which the azimuth of the magnetic head can be manually adjusted in response to the resistance value of the variable resistance means, the first variable resistance means having an operating section exposed to the outside and manually operated; , the azimuth of the magnetic head is selected when the magnetic tape is run in the forward direction, and when the operating section of the first variable resistance means is at a substantially intermediate position in its movable range, the azimuth of the magnetic head is set to the first position. a second variable resistance means which is adjusted so as to have a reference azimuth; and a second variable resistance means which is selected when the magnetic tape is run in the opposite direction and whose operating portion of the first variable resistance means is adjusted so as to have an azimuth approximately within its movable range. and third variable resistance means for adjusting the azimuth of the magnetic head to a second reference azimuth when the magnetic head is at an intermediate position.