JPH0722733Y2 - Rotating magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rotary magnetic head device, and in particular, to a structure in which two sets of rotary magnetic heads are provided at different heights above and below in the axial direction of a rotary drum. The present invention relates to a rotary magnetic head device.

(Prior Art) The applicant previously filed Japanese Patent Application No. 60-358 filed on February 25, 1985.
No. 27 and Japanese Patent Application No. 60-35828 (the title of the invention “color video signal recording / reproducing device”) were proposed. FIG. 8 shows a track pattern formed on a magnetic tape by this recording / reproducing apparatus (VTR). In this recording medium, the magnetic tape T is divided into two in the width direction, and luminance signal tracks Y ₁ and Y ₂ are provided in the lower recording band a _1.
Are alternately recorded, and color signal tracks C ₁ and C ₂ are alternately recorded in the upper recording band a ₂ . In the recording / reproducing apparatus (VTR) of such a signal recording / reproducing system, the luminance signal and the chrominance signal are divided into the recording bands a ₁ and a ₂ on the upper side and the lower side of the magnetic tape T and the guard bandless. Since azimuth recording is performed, the recording density is high, and there is an advantage that crosstalk becomes inconspicuous on the screen due to the field correlation between adjacent tracks.

Further, in FIG. 8, tracks A ₁ , A ₂ , B and C recorded and formed along the longitudinal direction of the magnetic tape T are tracks formed and recorded by a dedicated fixed head, and A ₁ and A ₂ are 1,
The audio track on which the audio signal of the second channel is recorded, B is the time code track on which the time code for knowing the position information on the tape is recorded, and C is the control track on which the control pulse of a constant cycle is recorded. .

FIG. 9 is a schematic side view of a rotary magnetic head device applied to such a recording / reproducing device.

In the figure, the upper rotary magnetic head 1 (for color signals) and the lower rotary magnetic head 2 (for luminance signals) are arranged in the axial direction of the rotary drum 3 with a step having a size equal to the distance h in FIG. Installed on the same line (inline) above and below.

The rotary drum 3 is provided coaxially with the lower fixed drum 4, and a tape guide (lead) 5 is integrally formed on the outer peripheral portion of the fixed drum 4, whereby the magnetic tape (2 (Indicated by a dotted chain line) is guided by the rotary drum 3 and the fixed drum 4 so as to run obliquely.

Further, the rotary drum 3 is rotationally driven by a drum shaft 6 supported below the fixed drum 4.

(Problems to be Solved by the Invention) FIG. 10 is a bottom view of the rotary drum of the rotary magnetic head device shown in FIG. 9, and FIG. 11 is a side view of FIG.

As shown in FIG. 11, in order to mount the upper rotary magnetic head 1 and the lower rotary magnetic head 2 at different heights with a step h, a concave portion 7 is formed on the lower surface of the rotary drum 3. The upper rotary magnetic head 1 is directly screwed onto the top surface of the recessed portion 7 by a mounting screw 8.

On the other hand, the lower rotary magnetic head 2 is screwed to a head holding plate 9 which is relatively larger than the head itself by a mounting screw 8, and this head holding plate 9 is further fixed to the lower surface of the rotary drum 3 by a mounting screw 10. To be screwed on.

10 and 11, only one upper and lower rotary magnetic heads 1 and 2 of the two sets of upper and lower rotary magnetic heads are shown, but the opposite side of the rotary drum 3 (not shown) is shown. ), Separate upper and lower rotary magnetic heads (not shown) are arranged at the same height as those of the rotary magnetic heads 1 and 2 on one side at an angular interval of 180 degrees from these rotary magnetic heads. .

Therefore, the lower surface of the rotary drum 3 must be processed to provide two recesses 7 at an angular interval of 180 degrees, but the recesses 7 having the shape shown in the drawing are usually milled. Therefore, there is a problem that it takes a lot of time and labor for processing.

Further, due to the fact that the two concave portions 7 are machined separately and the machining accuracy of the machining surface of the milling is limited, the dimensions of the two concave portions 7, especially the depth dimension and the concave dimension thereof, An error is likely to occur in the flatness of the portion 7 and the parallelism with the lower surface of the rotary drum 3, and therefore, the difference in the mounting height between the two (one set) upper rotary magnetic heads 1 and the inclination of the head may be increased. It was easy to occur.

On the other hand, since the lower rotary magnetic head 2 is screwed to the lower surface of the rotary drum 3 via the head holding plate 9, the height difference is likely to occur due to the large number of interposing attachment parts, and particularly the head holding plate. When the flatness of the upper surface of 9 is poor, this tendency becomes large.

As seen in Figure 8, the color signal track C _1, C ₂ and the luminance signal tracks Y _1, and Y _2, respectively two upper rotary magnetic head 1 and the guard band by the rotary magnetic head 2 in the lower However, in order to perform high-quality recording / reproduction, it is essential to reduce the height difference between the rotary magnetic heads.

In view of the above, the present invention solves the above-mentioned problems of the conventional technique, and installs two sets of rotary magnetic heads having different heights in the axial direction of the rotary drum with a high mounting position accuracy. It is an object of the present invention to provide a rotary magnetic head device that can be easily mounted on a rotary drum, and that can easily process the rotary drum and easily adjust the mounting position of each rotary magnetic head.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a rotary magnetic head device in which a plurality of sets of rotary magnetic heads are mounted at a step above and below in the axial direction of a rotary drum. An annular groove portion is formed on the upper surface of the rotary drum, the groove portion having the same depth along the entire circumference of the rotary drum, and the upper rotary magnetic head is attached to the bottom surface of the groove portion, and the lower rotary magnet is attached. A head is attached to a lower surface of the rotary drum, and a first portion for adjusting a rotational direction position and a protrusion amount of the upper rotary magnetic head is provided around the upper rotary magnetic head attached to the rotary drum. An adjustment hole is formed so as to be adjustable from above, and a second position for adjusting the rotational direction position and the protrusion amount of the lower rotary magnetic head is provided around the lower rotary magnetic head. Same adjustment hole The first and second adjustment holes have different diameters, and the upper base of the rotary magnetic head is attached to the upper base of the upper rotary magnetic head. A first adjusting screw for adjusting the height of the rotary magnetic head is also screwed in so as to be adjustable from above, and a mounting base of the lower rotary magnetic head is mounted on the upper rotary magnetic head. A second adjusting screw for adjusting the height of the lower rotary magnetic head is screwed into the rotary drum so that the same can be adjusted from above, and The first adjustment hole and the second hole formed in the rotary drum.
The adjustment holes of the upper rotary magnetic head and the lower rotary magnetic head allow adjustment of the rotational direction position and the amount of protrusion of the upper rotary magnetic head from above, and the adjustment screw and the first adjustment screw Provided is a rotary magnetic head device characterized in that height adjustments of the upper rotary magnetic head and the lower rotary magnetic head are similarly adjusted from above by a second adjusting screw. It is a thing.

(Operation) In the rotary magnetic head device having the above configuration, the two sets of rotary magnetic heads can be mounted on the rotary drum with high mounting position accuracy, and the mounting position can be easily adjusted.

(Embodiment) Before describing an embodiment of the rotary magnetic head device according to the present invention, the following rotary magnetic head device will be described.

FIG. 1 is a top view of a rotary magnetic head device used for explaining the present invention, FIG. 2 is a sectional view taken along the line AA ′ in FIG. 1, and FIG. 3 is BB in FIG. It is a cross-sectional arrow view of only the rotating drum along the line '.

As shown in FIGS. 1 to 3, this rotary magnetic head device includes a rotary drum 11 and a fixed drum 12, and a bearing portion 13 is integrally formed below the fixed drum 12, and the bearing portion 13 is integrally formed.
Bearings 14a and 14b are fixed to 13 and drum shaft 1
5 bearings.

A flywheel 16 is fixed above the drum shaft 15, and the rotary drum 11 is fixed to the upper surface C of the flywheel 16 by mounting screws (not shown).

Further, two sets of rotary transformers 17 and 18 are arranged between the fixed drum 12 and the flywheel 16, and respectively,
Luminance signals and color signals are transmitted and received to and from the rotary magnetic heads 1 and 2.

As shown in the sectional view of FIG. 3, an annular groove portion 19 having grooves of the same depth is formed on the upper surface of the rotary drum 11 over the entire circumference of the rotary drum 11, and the upper rotary magnet 11 The head 1 is attached to the bottom surface 20 of the groove portion 19, and the lower rotary magnetic head 2 is attached to the lower surface 21 of the rotary drum 11.

The groove portion 19 can be formed by lathe processing, for example.

That is, the head base 1b of the upper rotary magnetic head 1
Is attached to the bottom surface 20 of the groove portion 19 by two mounting screws 22A and 22A, and the head chip 1a is projected from the window 23 on the outer periphery of the rotary drum 11.

In addition, on the bottom surface 20 of the groove portion 19 of the rotary drum 11, around the position where the head base 1b of the upper rotary magnetic head 1 is attached, the upper rotation is performed on the left and right sides (drum rotation direction side) of the head base 1b. Adjustment holes 24, 24 for adjusting the rotational direction position of the magnetic head 1 (head chip 1a) are formed, and the upper rotary magnetic head 1 (head chip 1a) is located behind the head base 1b (center side of the drum). Adjustment hole for adjusting the protrusion amount of
26 is drilled. Then, in the adjusting hole 24 for adjusting the position in the rotational direction provided on the bottom surface 20 of the groove portion 19, a jig as shown in FIG.
25 is inserted from above the rotary drum 11 to adjust the position of the head chip 1a in the rotational direction from above the rotary drum 11. Similarly, the same jig 25 is provided in the adjustment hole 26 for adjusting the protrusion amount.
And the protrusion amount of the head chip 1a is adjusted.

Here, the jig 25 shown in FIG. 4 has a columnar tip portion 25a and a central portion 25b provided with a knob portion 25c.
The diameter of 25a is smaller than the diameter of the central portion 25b, and the center of the tip portion 25a is displaced from the center of other portions. Then, in order to perform the above position adjustment and adjustment of the protrusion amount, the tip end 25a of the jig 25 is inserted into the adjustment holes 24 and 26, respectively, and the peripheral surface of the central portion 25b is attached to the side surface of the head base 1b. When the knob 25c is rotated in this state, the tip portion 25a rotates in the adjustment holes 24, 26, while the center portion 25b is relatively deviated from the tip portion 25a. But,
Since it rotates while being eccentric, the peripheral surface of the central portion 25b pushes the side surface of the head base 1b, and therefore, the position adjustment in the rotational direction of the head chip 1a of the rotary magnetic head 1 and the adjustment of the protrusion amount can be performed.

Furthermore, an adjusting screw 27A for height adjustment is screwed into the head base 1b of the upper rotary magnetic head 1, and the adjusting screw 27A is turned from above to adjust the height of the head chip 1a.

On the other hand, the head base 2b of the lower rotary magnetic head 2 is screwed to the lower surface 21 of the rotary drum 11 by two mounting screws 34, 34, and is formed from the notch 28 at the lower edge of the outer peripheral portion of the rotary drum 11. The head chip 2a is projected.

Then, the jig 25 is inserted into the same adjustment holes 24 and 26 from the lower side of the rotary drum 11 to adjust the position of the head chip 2a in the rotational direction and the protrusion amount, and further, the lower rotary magnetic head 2 The adjusting screw 27B screwed into the head base 2b is turned from below to adjust the height of the head chip 2a.

As described above, the above-described rotary drum 11 is provided with the annular groove portion 19 on the upper surface thereof, and the bottom surface 20 of the groove portion 19 and the lower surface 21 of the rotary drum 11 are provided with the upper rotary magnetic head 1 and the lower rotary magnetic head 1, respectively. The rotary magnetic head 2 is attached with a predetermined step (h). Further, since the bottom surface 20 of the groove portion 19 and the lower surface 21 of the rotary drum 11 are lathe-machined with reference to the mounting surface C for the flywheel 16 and the mounting hole 29 for the drum shaft 15, parallelism between both surfaces and flatness of both surfaces are achieved. It is easy to improve the accuracy of surface wobbling.

Therefore, as shown in FIG. 2, after the rotary magnetic head device is assembled, two (two sets) each of the upper rotary magnetic heads 1 mounted at an angular interval of 180 degrees from each other, or the lower rotary magnetic heads 1 or There is no difference in the height of the rotary magnetic heads 2, and the step (h) between the upper and lower rotary magnetic heads 1 and 2 is kept constant.

However, in the rotary drum 11, the positions of the upper and lower rotary magnetic heads 1 and 2 must be adjusted from above and below the rotary drum 11, respectively. Therefore, an embodiment of the rotary magnetic head device according to the present invention in which the position of the rotary magnetic head can be adjusted from one direction will be described below with reference to the drawings.

FIG. 5 is a top view of an embodiment of the rotary magnetic head device according to the present invention, and FIG. 6 is a sectional view taken along the line DD 'in FIG.

In FIGS. 5 and 6, the same components as those in FIGS. 1 and 2 described above are designated by the same reference numerals, and the description thereof will be omitted.

The rotary drum 31 in this embodiment also has a sectional shape of
It is similar to that shown in FIG. 3 and has an annular groove portion on its upper surface, which is formed by grooves of the same depth over the entire circumference of the rotary drum 31.
19 are formed. Then, the upper rotary magnetic head 1
The head base 1b is screwed to the bottom surface 20 of the groove portion 19 with a mounting screw 22A, and the jig 25 is inserted into the adjustment holes 24 and 26 from above the rotating drum 31, and the position of the head chip 1a in the rotational direction is changed. Adjustment and protrusion amount adjustment.
The height of the head chip 1a is adjusted by turning A.

On the other hand, the lower rotary magnetic head 32 has a head base larger than the head base 1b of the upper rotary magnetic head 1, and the lower rotary magnetic head 32 has a head on the lower surface 33 of the rotary drum 31. A portion of the base 32b is attached by being screwed by a mounting screw 34.

On the lower surface 33 of the rotary drum 31, around the position where the head base 32b of the lower rotary magnetic head 32 is attached, the rotary magnetic head 32 on the lower side on the left and right sides (drum rotation direction side) of the head base 32b. Adjustment holes 35, 35 for adjusting the rotational position of the (head chip 32a) are provided, and the head base 3
Lower rotary magnetic head 32 on the back side of 2b (center side of the drum)
An adjustment hole 36 for adjusting the amount of protrusion of the (head chip 32a) is formed. The adjusting holes 35, 36 of the lower rotary magnetic head 32 have a diameter larger than the diameter of the adjusting holes 24, 26 of the upper rotary magnetic head 1. And these adjustment holes 35,36
Then, a jig 37 as shown in FIG. 7 is inserted from the upper surface (upper side) of the rotary drum 31 to adjust the position of the head chip 32a in the rotational direction and the protrusion amount.

Here, the jig 37 shown in FIG. 7 is obtained by enlarging the jig 25 shown in FIG. 4 so as to match the diameters of the adjusting holes 35 and 36, and has the same configuration. . That is, the knob portion 37c is provided on the cylindrical tip portion 37a and the central portion 37b. Then, in order to perform the above position adjustment and protrusion amount adjustment, the central portion 37b of the jig 37 is inserted into the adjustment holes 35 and 36, respectively, and the peripheral surface of the tip portion 37a is attached to the head base 3a.
By contacting the side surface of 2b and turning the knob portion 37c in this state, the peripheral surface of the tip portion 37a whose center is relatively deviated from the central portion 37b pushes the side surface of the head base 32b, and thus It is possible to adjust the position of the head chip 32a of the rotary magnetic head 32 on the side in the rotating direction and the amount of protrusion.

Further, an adjusting screw 38 for height adjustment is screwed into the bottom surface 20 of the groove portion 19, and by turning the adjusting screw 38, the tip end thereof is brought into contact with the upper surface of the head base 32b of the lower rotary magnetic head 32. Then, the height of the head chip 32a is adjusted.

As described above, in the embodiment of the present invention, the lower rotating magnetic head 1b of the upper rotating magnetic head 1 and the adjusting holes 24 and 26 are bypassed so that the mounting screw 34 and the adjusting screw 38 are provided. The head 32 is the head base of the upper rotary magnetic head 1.
Since the head base 32b is larger than 1b, the lower rotary magnetic head 32 can be adjusted in various positions from above the rotary drum 31, as with the upper rotary magnetic head 1.

In the process of mounting the rotary magnetic head of this embodiment, the upper rotary magnetic head 1 and the lower rotary magnetic head are attached.
The position of 32 is adjusted while observing the position of the head chip 1a or 32a with a microscope while the mounting screws 22A and 34 are half tightened. By making it possible to carry out from the direction (from above), the efficiency of adjustment work is improved.

Further, the adjustment holes 35, 36 of the lower rotary magnetic head 32 have a diameter larger than the diameter of the adjustment holes 24, 26 of the upper rotary magnetic head 1, so that the adjustment holes 35, 36 have the same size. Ingredient
With 25 or 37, the adjustment work can be performed without making a mistake in the adjustment hole.

Further, the present invention is not limited to the color video signal recording / reproducing apparatus described above, but is also applied to, for example, a helical scan type magnetic recording / reproducing apparatus disclosed in Japanese Utility Model Laid-Open No. Sho 58-170012. Of course, it is also possible to record and reproduce the signal and the audio signal by the lower rotary magnetic head.

The arrangement of the pair of rotary magnetic heads is not limited to the angular interval of 180 degrees described above.

(Effects of the Invention) As described above, according to the rotary magnetic head device of the present invention, the bottom surface of the annular groove portion of the rotary drum, which is the mounting surface of the upper rotary magnetic head, and the lower rotary magnetic head are mounted. Since the lower surface of the rotating drum that becomes the surface can be processed by lathe processing, the parallelism between both mounting surfaces, the flatness of both surfaces, and the accuracy of surface runout can be improved. The height difference between the upper rotary magnetic heads attached to each other or the lower rotary magnetic heads attached to each other can be substantially eliminated, and the dimensional accuracy of the step between the upper and lower rotary magnetic heads can be improved. Since the annular groove portion of the same depth is formed over the entire circumference of the rotating drum, the rotating drum can be made lighter, and further, the rotating drum has
The upper rotary magnetic head and the lower rotary magnetic head, which are attached to the upper and lower magnetic heads, have their own adjustment holes for adjusting the position in the rotational direction and the protrusion amount, respectively, so that adjustment can be performed from above. Moreover, the diameters of these dedicated adjustment holes are made different, and the heights of the upper and lower rotary magnetic heads are adjusted to the mounting base of the upper rotary magnetic head and the rotary drum, respectively. Adjustment screws are also screwed together to allow adjustment from above, and the lower rotary magnetic head has a larger mounting base than the mounting base of the upper rotary magnetic head.
Both the rotational direction position of each of the upper rotary magnetic head and the lower rotary magnetic head and the protrusion amount and the height can be adjusted from above the rotary drum, and the adjustment by the adjustment hole is made. In this case, it is possible to perform adjustment work without making a mistake in adjusting holes by using jigs that match the size of the hole diameter respectively, and it is possible to shorten the assembling time of the rotary magnetic head device and to be excellent in mass productivity. Has features.

[Brief description of drawings]

FIG. 1 is a top view of a rotary magnetic head device used for explaining the present invention, FIG. 2 is a sectional view taken along the line AA ′ in FIG. 1, and FIG. 3 is BB in FIG. FIG. 4 and FIG. 7 are perspective views showing a jig for adjusting the mounting position of the rotary magnetic head, and FIG. 5 is a perspective view of the rotary magnetic head device according to the present invention. FIG. 6 is a top view of the embodiment, FIG. 6 is a sectional view taken along the line DD ′ of FIG. 5, and FIG. 8 is a track formed on a magnetic tape by the magnetic recording / reproducing apparatus previously proposed by the applicant. Figure showing the pattern, No. 9
The figure is a schematic side view of the rotary magnetic head apparatus applied to the previously proposed apparatus, FIG. 10 is a bottom view of the rotary drum of the rotary magnetic head apparatus shown in FIG. 9, and FIG. 11 is a side view of FIG. Is. 1 …… Upper rotary magnetic head, 2,32 …… Lower rotary magnetic head, 1a, 2a, 32a …… Head chip, 1b, 2b, 32b …… Head base (mounting base), 11,31 …… Rotating drum, 1
2 …… Fixed drum, 13 …… Bearing part, 15 …… Drum shaft, 16
...... Flywheel, 19 …… Groove, 20 …… Groove 19 bottom, 21 …… Rotary drum 11 bottom, 22A, 22B, 34 …… Mounting screw, 23 …… Window, 24,26,35,36… … Adjustment hole, 25,37 …… Jig, 27A, 27B, 38 …… Adjustment screw, 28 …… Notch, 29 …… Mounting hole, 33 …… Lower surface of rotating drum 31.

Claims (1)

[Scope of utility model registration request] 1. A rotary magnetic head device in which a plurality of sets of rotary magnetic heads are mounted on the upper and lower sides in the axial direction of a rotary drum with a step, and the same depth is provided on the upper surface of the rotary drum over the entire circumference of the rotary drum. A ring-shaped groove portion formed of a groove of, the upper rotary magnetic head is attached to the bottom surface of the groove portion, the lower rotary magnetic head is attached to the lower surface of the rotary drum, A first adjustment hole for adjusting the rotational direction position and the protrusion amount of the upper rotary magnetic head to be mounted is provided around the upper rotary magnetic head to be adjustable from above. A second adjustment hole for adjusting the rotational position and the protrusion amount of the lower rotary magnetic head is formed around the lower rotary magnetic head so that the second adjustment hole can be adjusted from the upper direction. , These first, first The diameter of the adjusting hole is different, and a first adjusting screw for adjusting the height of the upper rotary magnetic head is also mounted on the mounting base of the upper rotary magnetic head from above. The mounting base of the lower rotary magnetic head is larger than the mounting base of the upper rotary magnetic head, and the lower rotary magnetic head is attached to the rotary drum. A second adjusting screw for adjusting the height of the head is also screwed so as to be adjustable from above, and the first adjusting hole and the second adjusting hole formed in the rotary drum are provided. The upper rotary magnetic head and the lower rotary magnetic head are respectively adjusted in rotational direction position and protrusion amount from above, and the first adjustment screw and the second adjustment are performed. And the upper side of the A rotary magnetic head device, wherein height adjustments of the rotary magnetic head and the lower rotary magnetic head are similarly performed from above.