JPH086145A - Magnetic recorder and method therefor - Google Patents

Abstract

PURPOSE:To magnetically transfer information on a film without making a transfer medium running in contact with a magnetic head in a magnetic recording process for film information by recording digital information obtained by reversing a mirror image on the transfer medium in non-contact state. CONSTITUTION:Thermomagnetic recording is carried out by imparting a signal for forming a magnetic field in a direction of recording from a recording amplifier to the transfer medium 11 to the magnetic head 21 and irradiating a magnetization reversal position where the signal to be recorded on the film F is mirror-image reversed with laser beams 23 from a laser heat source 22. The magnetic head 21 is allowed to have the magnetic field lower than that required in the case of carrying out contact recording, so that it is not necessary to bring the transfer medium into contact with the magnetic head 21. Thus, a signal with a mirror image symmetric pattern to be transferred to the film F is formed on the transfer medium 11 lying on the surface of a transfer drum 1. And the magnetic surface of the film F wound around the transfer drum 1 is brought into tight contact with the magnetic surface of the thermomagnetically recorded transfer medium 11, then, by applying an adequate amount of bias magnetic field on that part by a bias magnetic field head 31, the signal on the transfer medium 11 is transferred to the film F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording apparatus for magnetically recording digital information on a photographic film coated with a magnetic layer, and a method thereof.

[0002]

2. Description of the Related Art Photographic film (hereinafter referred to as film)
At the time of manufacturing, film information such as manufacturer name, film type, emulsion lot, sensitivity, number of frames, latitude, date of manufacture, etc. is magnetically recorded, and this information is played back by the camera at the time of shooting or printed at the time of printing. Play with
In recent years, various proposals have been made for optimizing photographing conditions or printing conditions by automating to obtain high quality photographs.

When a film manufacturer records such film information in advance by magnetic recording, there is a problem that the film is scratched when the film is contacted and run using a magnetic head for recording. As a countermeasure against this, a magnetic field transfer method has been proposed in which transfer is put into practical use for video and the magnetic layer of the film is brought into contact with each other to perform transfer.

[0004]

However, since the purpose for video is to copy video software, the characteristic guarantee by demagnetization of the transfer medium may be about several thousand times, but in the film production, it is tens of thousands times. The above is necessary. Therefore, it is necessary to re-record information on the transfer medium while transferring the transfer medium sequentially or according to the degree of demagnetization. At this time,
When recording on the transfer medium again without stopping the manufacturing process, recording of information on the transfer medium must be performed at the same speed as the transfer speed, but magnetic field transfer to the film is performed at a high speed of several meters per second. Therefore, in the method of directly recording by moving the magnetic head in contact with the transfer medium to directly record, the transfer medium is scratched, and the dropout occurs due to the loss of the magnetic layer of the transfer medium,
There is a problem that the image quality of photographs is impaired due to the adherence of missing magnetic powder to the film during contact transfer.

Therefore, in order to solve the above problems, the present invention provides a magnetic recording apparatus and method for performing magnetic field transfer to a film in a magnetic recording process of film information without causing a transfer medium to run in contact with a magnetic head. The purpose is to do.

[0006]

In the magnetic recording apparatus for magnetically recording digital information on a photographic film coated with a magnetic layer, a rotating transfer medium and the film are brought into close contact with the transfer medium in the present invention. Traveling means for traveling while moving, thermomagnetic recording means for recording the mirror-inverted digital information on the transfer medium in a non-contact state, and magnetic field transfer of the information recorded on the transfer medium to the magnetic layer of the film. A magnetic recording device characterized by comprising a magnetic field transfer means.

[0007]

In the present invention, information is recorded on the transfer medium by thermomagnetic recording. Therefore, as the transfer medium, a medium having characteristics suitable for thermomagnetic recording, for example, a medium having a low Curie temperature such as CrO ₂ (chromium oxide) is used.

In recording a digital signal, unlike the recording of an analog signal, the magnetization reversal position of the signal is important, not the size of the recording signal. Therefore, a recording magnetic field to be recorded in advance is applied to the transfer medium by the magnetic head, a laser heat source is irradiated from the center of the magnetic head to the magnetization reversal position to be recorded, and the temperature of the transfer medium is instantly raised by this heat source to increase the coercive force. Recording is performed by lowering and magnetizing in the recording magnetic field direction. At this time, the recording magnetic field may be given by a magnetic field magnetized by the reduced coercive force of the transfer medium, and the recording magnetic field can be lowered as compared with the case where the magnetic head is directly contacted to directly record the magnetic field. The required recording magnetic field can be obtained without contact and recording. Then, the information recorded on the transfer medium by the above method is transferred to the magnetic recording layer of the film by magnetic field transfer by bringing the transfer medium and the film into contact with each other. By the above recording process, information can be recorded on the film without contact recording by the magnetic head.

[0009]

Embodiments of the magnetic recording apparatus of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

A transfer drum 1 rotating clockwise is provided in the center of the drawing, and a recording medium having a low Curie temperature, for example, CrO ₂ (chromium oxide) is used as a transfer medium 11 on the surface of the transfer drum 1. Has been applied. Around the transfer drum 1, a thermomagnetic recording device 2 which is a thermomagnetic recording device for digitally recording film information on the transfer medium 11 and a magnetic field transfer device 3 which is a magnetic field transferring device for performing contact transfer on the film F are arranged. ing.

The thermomagnetic recording apparatus 2 is mainly composed of a magnetic head 21 and a laser heat source 22 for irradiating a laser beam 23 from the center of the magnetic head 21. The magnetic head 21 has
A laser heat source is provided at a magnetization reversal position where a signal for forming a magnetic field in a recording direction on the transfer medium 11 is applied from a recording amplifier (not shown) and the signal to be recorded on the film F is mirror-inverted.
Laser light 23 is irradiated from 22 to perform thermomagnetic recording. The magnetic head 21 does not need to be in contact with it because it requires a lower magnetic field than contact recording. As a result, the transfer medium on the surface of the transfer drum 1
A signal having a mirror-symmetrical pattern to be transferred to the film F is created at 11.

The magnetic field transfer device 3 mainly comprises a bias magnetic field head 31 and an air chamber 32 in a casing 33. The film F is sent out and wound up by the traveling means. That is, it is sent from the supply reel 41 and wound around the outer periphery of the transfer drum 1 by the guides 42 and 43.
It is taken up by the take-up reel 44. By bringing the magnetic surface of the film F wound around the transfer drum 1 into close contact with the magnetic surface of the transfer medium 11 recorded by thermomagnetic recording, and applying an appropriate amount of bias magnetic field from the bias magnetic field head 31 thereto,
The signal of the transfer medium 11 is transferred to the film F. Further, the casing 33 of the magnetic field transfer device 3 is configured so that the film F can travel at a high speed without its magnetic surface being displaced from the transfer medium 11.
Compressed air 34 is blown through the inside of the air chamber 32 for running.

FIG. 2 is a longitudinal sectional view of the second embodiment of the present invention.

In the first embodiment, the transfer medium 11 is applied to the surface of the transfer drum 1, but in the second embodiment, the transfer medium 12 applied on the belt is used so that the transfer medium can be easily replaced. It is wound around the transfer drum 1 and the guide roller 13. For this reason, the thermomagnetic recording device 6 is also provided with the casing 64 so that the transfer medium 12 travels with respect to the transfer drum 1 at a high speed without deviation, and the compressed air 66 is blown through the air chamber 65 in the casing 64. There is. The magnetic head 61 and the laser heat source 62 are the same as the magnetic head 21 and the laser heat source 22 of the first embodiment. Further, the other structure and the operation thereof are the same as those of the first embodiment, and therefore omitted.

FIG. 3 is a vertical sectional view of a third embodiment of the present invention.

In the thermomagnetic recording of the present embodiment, as shown in the figure, the transfer medium is previously DC erased by the erase head 51, and the bias magnetic field head 52 constantly applies a DC magnetic field in the direction opposite to that of the erase head 51. The laser light 53 is controlled by controlling the laser heat source 54 from a signal source (not shown) according to ON / OFF of the signal to be recorded on the transfer medium 11.
Is emitted / stopped (or stopped / emitted) to perform thermomagnetic recording. In this case, the strength of the DC magnetic field generated by the bias magnetic field head 52 should be equal to or lower than the coercive force of the transfer medium 11 at room temperature and equal to or higher than the coercive force of the transfer medium 11 when heated by laser light.

In each embodiment, the area for transferring information to the film may be the full width of the film or a part thereof. The recording width recorded on the transfer medium may be wider than the film width.

[0019]

According to claim 1, claim 4, claim 5 or claim 6 of the present invention, in the process of recording magnetic information on the film, from the magnetic recording on the transfer medium to the magnetic recording on the film, Since it can be performed without contacting the magnetic head, the film information can be magnetically recorded on the film at high speed without deteriorating the photographic quality of the film.

According to the second or third aspect, even if the transfer medium is scratched or the like, it can be easily replaced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a second embodiment of the present invention.

FIG. 3 is a vertical sectional view of a third embodiment of the present invention.

[Explanation of symbols]

 F film 1 transfer drum 2, 4, 5 thermo-magnetic recording device 3 magnetic field transfer device 11, 12 transfer medium 21, 61 magnetic head 22, 54, 62 laser heat source 31, 52 bias magnetic field head 51 erasing head

Claims (6)

[Claims] 1. In a magnetic recording apparatus for magnetically recording digital information on a photographic film coated with a magnetic layer, a rotating transfer medium, a running means for running the film while closely contacting the transfer medium, and a mirror image reversal. And thermomagnetic recording means for recording the digital information on the transfer medium in a non-contact state, and magnetic field transfer means for magnetically transferring the information recorded on the transfer medium to the magnetic layer of the film. Magnetic recording device. 2. The magnetic recording apparatus according to claim 1, wherein the transfer medium is formed in a belt shape. 3. The magnetic recording apparatus according to claim 2, wherein compressed air is blown onto the transfer medium from inside the thermomagnetic recording means. 4. The magnetic recording apparatus according to claim 1, wherein compressed air is blown onto the transfer medium from inside the magnetic field transfer means. 5. A magnetic recording method for magnetically recording digital information on a photographic film coated with a magnetic layer, wherein the recording of the mirror-inverted digital information on a rotating transfer medium is performed by thermomagnetic recording in a non-contact state. And magnetic field transfer of the information of the transfer medium to the magnetic layer of the film that runs while closely contacting the transfer medium. 6. The magnetic recording apparatus according to claim 1, or the magnetic recording method according to claim 5, wherein the transfer medium is formed of chromium oxide.