JPS605489A - Camera device unified with vtr - Google Patents

Abstract

PURPOSE:To record a tape pattern same as that obtained by a head azimuth recording/reproducing device divided into two parts at 180 deg. with high productivity, by setting a composite head on an electrical-mechanical transducer and controlling this transducer to change the position of said head in the direction vertical to its revolving surface for each revolution. CONSTITUTION:A piezoelectric element plate 4 containing a head is set on a rotary drum 5 which revolves toward an arrow Y to serve as a rotary head. This rotary head scans a tape 6 traveling toward an arrow Z to record and reproduce signals. At the outset a head 1 starts scanning the tape 6 from a position 8' and ends the scan at a position 7'. Meanwhile a head gap 2 records the video signals produced from an image pickup device 11 to the tape 6. The element 4 moves toward an arrow X until a head gap 3 reaches the position of the gap 2. Then the head 1 starts again to scan the tape 6 at the position 8' and finishes the scan at the position 7'. Meanwhile the gap 3 having a different azimuth from the head 2 records video signals. Thus tracks A1, B1, A2, B2-are recorded equidistantly by (l) on the tape 6.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a VTR integrated camera device.

(Prior art and its problems) Generally, as a magnetic recording/reproducing apparatus (VTR) having a conventional helical scan type rotary head, a 1800-division 2-head azimuth recording/reproducing apparatus using two heads with different azimuths is used. .

This has two heads with different azimuths placed at 1800 degree angles on a rotating drum.

A tape wound approximately half a circle around the outer circumference of a rotating drum is scanned, and two heads each alternately record and reproduce one field of video signals.

At this time, the tape is wrapped around the outer periphery of the rotating drum at an angle slightly greater than 180° to ensure an overlapping angle, so that the video signal is transmitted at t! It is possible to record and play back without missing any data. Further, the track pattern on the tape is equally spaced. However, a VTR-integrated camera device using such a magnetic recording/reproducing device has the disadvantage that it is larger than a device in which a video signal is recorded with a single head.

In addition, a magnetic recording and reproducing device that records a tape pattern similar to the 180° split two-head azimuth recording and reproducing device has 2n heads (n is an integer of 2 or more) arranged at equal intervals on a two-rotation drum. In addition, the magnetic recording and reproducing device can be made smaller by winding the tape around the rotating drum at an angle of 180° or more and approaching 360°, and by making the diameter of the rotating drum smaller than that of a 180° split two-head azimuth recording and reproducing device. There was something. In this device, the number of heads is 2n.

The angle of winding the tape around the rotating drum is (360 x 2%)
, 1) The angle is slightly larger than o, and the diameter of the 9-rotation drum is 180° compared to the 2-head azimuth recording and reproducing device.
2n''-1 times. However, in this device, out of 2n heads, for two sets of n heads.

Since it is necessary to equalize head characteristics such as azimuth among the n rough heads, there is a drawback that productivity is poor.

(Objective) The object of the present invention is to eliminate the drawbacks of the conventional VTR-integrated camera device as described above, to improve productivity, and to provide a 180°
It is an object of the present invention to provide a V'l''R integrated camera device capable of recording a tape pattern similar to that of a split two-head azimuth recording/reproducing device.

(Example) Examples of the present invention will be described below with reference to FIGS. 1, 2, and 3. In FIGS. 1, 2, and 3, reference numeral 1 denotes a composite magnetic head having caps 2 and 3 with different azimuths, and an electro-mechanical transducer element such as a piezoelectric plate element that moves up and down in the direction of the force applied to the control voltage. It is installed on 4. A piezoelectric plate element 4 with a head installed thereon is installed on a rotating drum 5 rotating in the direction of arrow Y to constitute a rotating head, and scans a tape 6 running in the direction of arrow Z to record and reproduce signals. 7 and 8 are guide balls, respectively, and the tape 6 is wound around the outer periphery of the rotating drum 5 at an angle of nearly 360° (360-θ)0. 8' and 7' are points at which the head 1 starts and ends scanning the tape 6. 9 is a detection circuit for the TACH pulse generated by the rotation of the rotary drum, and 0 is a video signal readout signal generation circuit that controls the scanning period of the image pickup device 11 that generates the video signal, that is, the video signal generation period. Reference numeral 12 denotes a switching circuit that switches and supplies video signals to be recorded to the helad gap 2.3 at appropriate times. 13 is a control circuit for the switching circuit 12 and the piezoelectric plate element drive circuit 14.

Next, the operation will be explained. First, while the head 1 starts scanning the tape 6 from position 8' in FIG. 3 and finishes scanning at position 2 7', the head gap 2 records the video signal generated from the imaging device 11 on the tape 6.

The recording track at this time is shown in FIG. 4A. Next, during a period when the head 1 and the tape 6 are not in contact with each other, that is, during a period when the head 1 moves from position 7' to position 8' in FIG. The connection between the head gap imaging devices at 12 is switched from head gap 2 to head gap 3. moreover.

During that period, the piezoelectric plate element 4 moves in the direction of the arrow X until the head gap 3 is at the position of the helad gap 2. Then, while the head 1 again starts scanning the tape from position 8' and finishes scanning at position 2 7', the head gap 3 having a different azimuth from the head gap 2 records the video signal. The recording trunk at this time is shown in FIG. 4B. 4-During the next movement of head l from position 7' to position 8', piezoelectric plate element 4 moves in the direction of arrow X to its initial position.

Then, while the head 1 scans the tape again, the head gap 2 records the video signal. The recording track at this time becomes A2 in FIG. By repeating the above operation, the head gaps 2 and 3 alternately record the video signal without missing, and the tape 6J: has tracks AI r Bl r A2 r
B2... are recorded at equal intervals l. Here, if the piezoelectric plate element 4 does not move and the head gaps 2 and 3 record video signals alternately, the track recorded with the head gap 3 will be as shown in FIG. 4 Bl' + B2'...
・It becomes like this.

The recording tracks are no longer evenly spaced.

As described below, since one composite head 1 having a gap 2.3 with a different azimuth is used on the north side of the piezoelectric plate element 4, one
It can record the same tape pattern as an 80° split 2-head azimuth recording/playback device.

Productivity is better than the conventional example using a large number of heads.

(Effects) As explained above, according to the present invention, video signals are continuously recorded azimuthally for each field.
A tape pattern similar to that of a 00 division 2 head azimuth recording and reproducing device can be recorded. Furthermore, since one composite head having two different azimuths is used, productivity can be improved compared to conventional magnetic recording/reproducing devices that use a large number of heads.

[Brief explanation of drawings]

FIG. 1 is a front view of a rotary head device according to an embodiment of the present invention, FIG. 2 is an enlarged side view of the head portion of the rotary head device of the present invention, and FIG. 3 is an overall block diagram of an embodiment of the present invention. FIG. 4 is a track pattern diagram on a magnetic tape recorded according to an embodiment of the present invention. 01: composite magnetic head, 2.3: head gas sub. 4: piezoelectric plate element, 5: rotating drum, 6. magnetic tape, 7
, 8 Ni guide ball, 9: TACH pulse detection circuit, 10: Video signal readout signal generation circuit, 11: Imaging device, 12: Video signal switching circuit, 13: Video signal switching and piezoelectric plate element drive control circuit, 14: Piezoelectric Plate element drive circuit.

Claims (1)

[Claims] 9 for recording an imaging device and an output signal of the imaging device;
The wrapping angle of the tape around the rotating throat drum is 360°
In a VTR-integrated camera device equipped with a one-head type helical scan rotary head VTR having a configuration of less than 100 mm, the scanning of the L-type image pickup device is stopped only when the tape and the head are not in contact with each other. A composite head having different azimuth angles and stacked in the direction perpendicular to the two rotational planes is used as the head for the application, and the composite head is installed on an electro-mechanical conversion element to control the element. A VTR-integrated camera device characterized in that a recording track is formed on a tape by changing the position of the composite head in a direction perpendicular to the rotational surface for each rotation.