JPS58137106A - Optical high-density recording device - Google Patents

Abstract

PURPOSE:To obtain a miniaturized, lightweight camera-combined VTR by providing a light source modulated by a signal, magnetic recording medium, means for forming parallel slanting recording tracks by allowing irradiation light from the light source to scan on the magnetic recording medium, and means for allowing the irradiation scan at a specific speed. CONSTITUTION:A magnetic tape 1 runs between reels 6 and 7 and laser light from an infrared-ray laser oscillator 5 is reflected by a reflecting mirror 4 to form tracks 2 on the film surface of the magnetic tape 1 through the rotation or oscillation of the reflecting mirror 4. When, however, this rotation or oscillation is carried out at a specific speed, the scanning speed of the tracks 2 is not constant, so a reproduced picture through the reproduction of a normal VTR distorts vertically. This nonlinearity is compensated by rotating curved-surface mirrors 30, 31, and 32 around a shaft at a specific speed. The mirror 30 allows a scan on the track center part 37 of the tape 1 at a solid-line position and then rotates clockwise to reach a position of 30, and the shaft 33 should rotate excessively to position it at the track end 38 because the mirror is curved, thereby compensating the characteristics.

Description

[Detailed Description of the Invention] This invention is suitable for video recording*4 in nine lights 141%! It takes directly to the brass device.

Although VTRs have become popular, they still have the disadvantage of being 8mm and heavier than optical 8mm cameras.

The present invention is manufactured with a volume of 1 weight such as an 8-frame camera and a VTRK with an integrated camera.

The present invention mainly employs a method in which a magnetic recording medium magnetized by a laser beam is demagnetized according to a signal for recording.

In this method, the inventor applied for a patent application filed on December 29, 1866 (December 29, 1866
2)) It is possible with the method described.

The optical diagonal recording system for magnetic tape is also described in the patent application filed by the inventor (Patent Application (1), December 9th, 1885), but there still remains a problem regarding the constancy of the scanning speed.

The present invention provides a compact and novel means for performing diagonal scanning at a constant speed.

The fs1 diagram is recorded by the device of the present invention on a round magnetic tape l.
Indicates 2 are parallel and Kuji silver marks (tora).

The audio and control tracks (refer to the figure below) are omitted from the diagram.

1g2wA is the quantitative I! of the present invention! This is a W14 diagram. The magnetic tape l runs between reels 6 and 7 in a known manner. 6 is a laser, and an infrared laser is suitable. 4 is a reflecting mirror, which reflects the laser light and
#IIIK is shown on the back side.

Make a tiger like this. However, if this rotational structure is vibrated at a certain level, the degree of scanning of the front and back will not be constant. Therefore, if playback is performed on a normal VTR, the reproduced image will be distorted in the vertical direction. The same goes for the case where the distance between the zero reflector 4 and the tape is increased (then the scanning speed approaches a constant value, but it becomes bulkier).

The sWA 2 shows a magneto-optical recording device for a VTR.
Tape 1 has # embedded into the semicircular guide with guide pins 11, 1!
10, which is scanned by the two laser beams B1610 and the non-transparent body 8, may be made of a single body as long as it is made of a glass medium infrared transmitting material. It is also possible to scan the darkness that splits into two.

In the irises 4E, the guide 1G'' has the center of the fiff@O', and the tape 1 is scanned in the same way by the 8 O lasers 6.6t, 6++ tip rotary body 8. To, space for drum 4 #i happy 8 in figure t
! 'f decreases, it decreases to near V8 in the Raku 4 figure.

Figure 116 shows the light feeding part of the laser rolling body, fixed laser 6
The tape is rotated and scanned via the output light-combining guide 17, the rotating optical coupling section 20, and the lenses 1g and 111 if necessary. Coupling Department's well-known optical oid possible - by connection.

Of course, in the previous example $18.4gI, electrical coupling using a conventional rotary transformer or the like and a rotary laser may also be used.

In FIG. 4, the laser 6 is fixed, and the mirror 16 in the Δ array is rotated to scan the tape on the guide 10' as shown in FIG.

In Figure 7 KsP, the mirror type 6 in the Y array is turned around and the light from the laser 6 is scanned by the tape IK pin.

These may be reciprocating motions as in the case of FIG. 2, but even if they are, it is necessary to provide non-shaped motion faK in order to diagonally scan the tape at a constant speed.

FIG. 8 shows the scanning displacement 2 on the tape in the case of constant rotation using the above device (s)Ilfl! ? The horizontal axis is time. As shown in the figure, it is fast at the top and low at the center. Therefore, as shown in the figure, the reciprocating motion of the mirror 21I must be achieved by giving a displacement as shown at 28 and compensating for the nonlinearity at 27.

FIG. 9 shows an inventive device that uses a one-way mirror to compensate for nonlinearity. It is a curved mirror manufactured by SO, AT, and SG, and rotates around a shaft 88 at a constant speed. It is assumed that the mirror 80 is to scan the 8 central parts of the tape 1 at that position, and then it is rotated to the right and 8
In order to come to WIK at position 0I and reach end 88 of l, since the mirror is shaped like the figure (-), the axis tS has to be rotated more than 1. Therefore, as shown in Fig. In the case shown in the figure, the mirror has a convex surface, so the light from laser beam b is thought to diverge, but for beams at7w or less, the radius of curvature of - can be made with the minimum number toopK, so it is approximately It is considered to be equivalent to a plane mirror. If necessary, a correction lens may be attached to the laser beam. In this case, it is a concave lens that corrects 1,000 points in terms of flatness.

By this method, diagonal scanning at a constant speed is performed. The same effect can be obtained by using mirror surfaces in a Δ arrangement as shown in Figure 6.

The GTO diagram shows the rotational characteristics required when directly rotating a normal plane mirror or laser.
Depending on the design of the field and the rotor, it can also be obtained with an ordinary single-turn machine.

FIG. 1111 shows a ray 16.6', 6'' Oa transfer device using the motor 40 having the characteristics as shown in FIG.

The tape I is scanned diagonally at a constant speed.

Of course, in addition to this, a -l system as described in the previous patent application may be used in combination to perform a predetermined non-S-shaped rotation.

It is desirable that the brass tape according to the present invention produces a wide marking, especially for VTR playback.

For this purpose, as described in the invention patent application No. 1856, a strip-beam laser with a central columnar lens, etc. is used, or a well-known method using a social grid is used, and the simultaneous application of patent application No. 1857 is used.
Apply the method described in M. With this, it is possible to perform Asiatic recording, and it can be reproduced with commercially available V'l'R.

The present invention can also be applied to recording media other than tape. It is also possible to use an infrared source or the like in place of the laser.

The present invention is limited to the above specific example! It is possible to make partial combinations of various honey-shaped yarn collection examples.

[Brief explanation of the drawing]

Figure 1 shows a magnetic tape with diagonal markings. FIG. 2 shows a magneto-optical oblique recording device. Figure 8.4 shows the diagonal II &
Show the device. Figure 5 shows the optical rotation coupling part. FIG. 6 is a modification of FIG. 4. Diagram 7 shows a magneto-optical diagonal writing device using rotation. Diagram 8 shows a change in scanning speed in the apparatus shown in diagram 7 and a characteristic section for correcting this change. Figure 1 shows a rotating mirror that maintains a constant scanning speed according to the present invention. Figure 10 shows the motor characteristics when the scanning speed is constant. FIG. 11 shows an oblique recording device with a constant scanning speed using the motor shown in FIG. Drawing aF (no change in content) Procedural amendment (method) June 8, 1980 Commissioner of the Japan Patent Office Sir 1, Indication of the case 1985 Patent Application No. 18582 2 Name of the invention High-density recording device a Relationship with the case of the person making the amendment Patent application call received Date of amendment order May 25, 1988 (shipment date) & 0 drawings subject to amendment Contents of amendment as shown in the attached sheet

Claims (1)

[Claims] A light source modulated by a signal, a magnetic recording medium, means for scanning the armpit magnetic recording medium with a mosquito light source to produce parallel diagonal recording, and means for performing the irradiation scanning at a constant speed. A light high-density transcription brass device.