JPH08329432A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE: To warn of that when clogging occurs in a magnetic head when a magnetic signal is recorded/reproduced for a magnetic track of a developed photographing film. CONSTITUTION: When the magnetic signal recorded on the magnetic track is reproduced to an electric signal by the magnetic head, the electric signal from the magnetic head is inputted to an envelope detection circuit 62B, and the envelope signal of the electric signal is generated. Then, the amplitude value of the envelope signal is converted into a digital signal by an A/D converter 62C to be outputted to a control part 50. The control part 50 decides whether or not the clogging occurs from the size of the amplitude value, and when it decides as the clogging, the part 50 warning displays that the clogging occurs on a display part 64. On the other hand, when the magnetic signal is recorded on the magnetic track, the magnetic head 52A of an upstream side is made a recording head, and the magnetic head 52B of a downstream side is made a reproducing head, and the magnetic signal is recorded by the recording head, and the recorded magnetic signal is reproduced by the reproducing head, and the clogging of the magnetic head is decided similarly to the above matter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a magnetic recording / reproducing apparatus for recording / reproducing a magnetic signal on / from a magnetic track on a photographic film.

[0002]

2. Description of the Related Art Heretofore, there has been proposed a camera which uses a photographic film having a magnetic recording layer and can write or read the shooting date and time, shooting information and the like with a magnetic head at the time of shooting (Actual Kaihei 4). -89934, JP-A-4-11237, WO90 / 430.
1).

After the photographic film is developed, the information recorded on the magnetic recording layer of the photographic film is used as information when a film image is taken by an image sensor and reproduced on a monitor TV (WO90 / 4301). ,
Alternatively, it is used as information when printing a film image on photographic paper.

[0004]

The magnetic recording layer of a photographic film is formed by coating a transparent magnetic material on the photographic film. This magnetic substance becomes magnetic powder due to sliding friction of the magnetic head or the like during film transport, and accumulates in the gap portion of the magnetic head to cause clogging.

Further, when the photographic film after the development processing is regenerated, especially, the processing solution at the time of development on the photographic film,
Dust and the like are attached, and these also cause clogging of the magnetic head. When the magnetic signal is recorded on the magnetic track, the clogging of the magnetic head remarkably attenuates the signal strength of the magnetic signal, and when the magnetic signal recorded on the magnetic track is reproduced as an electric signal. First, the signal strength of this electric signal is significantly attenuated.

As a result, the data recorded on the magnetic track cannot be correctly reproduced, or the desired data cannot be correctly recorded on the magnetic track.
If the recording / reproducing of the data is erroneous as described above, the erroneous data will be recorded on the magnetic track as the correct data thereafter, and the original correct data will be damaged.

In particular, when the magnetic signal of the magnetic track is a digital signal, clogging of the magnetic head may cause disappearance or inversion of data, which causes a fatal problem. The present invention has been made in view of the above circumstances, and a magnetic recording that warns when a magnetic head is clogged when recording / reproducing a magnetic signal to / from a magnetic track of a photographic film. An object is to provide a reproducing device.

[0008]

In order to achieve the above-mentioned object, the present invention provides a magnetic recording / reproducing apparatus for reproducing a magnetic signal recorded on a magnetic track on a developed photographic film into an electric signal by a magnetic head. At the time of reproducing the magnetic signal, the amplitude value of the electric signal obtained from the magnetic head, the first reference value for determining that the magnetic head is in a normal state, and the first reference value for determining that magnetic recording has been performed. And a magnetic head when the voltage value of the electric signal indicating the high level is determined to be greater than or equal to the second reference value and less than or equal to the first reference value by the comparison means. And a warning means for warning that clogging has occurred.

An electric signal is converted into a magnetic signal by a recording head and recorded on a magnetic track on the developed photographic film, and the recorded magnetic signal is immediately transferred to an electric signal by a reproducing head downstream of the recording head. In a magnetic recording / reproducing apparatus for reproducing information, an amplitude value of an electric signal obtained from the reproducing head at the time of recording is compared with a predetermined reference value for judging that the recording head and the reproducing head are in a normal state. A warning that at least one of the recording head and the reproducing head is clogged when the voltage value of the electric signal indicating the high level is determined to be equal to or less than the predetermined reference value by the comparison means And a warning means for doing so.

[0010]

According to the present invention, when a magnetic signal recorded on a magnetic track on a developed photographic film is reproduced into an electric signal by the magnetic head, the amplitude value of the electric signal obtained from the magnetic head and the magnetic head The comparison means compares the first reference value for determining the normal state and the second reference value for determining the magnetically recorded state. Then, when the comparison unit determines that the voltage value of the electric signal indicating the high level is greater than or equal to the second reference value and less than or equal to the first reference value, the warning unit determines that the magnetic head is clogged. Warning.

According to another aspect, when the electric signal is converted into the magnetic signal by the recording head and recorded on the magnetic track on the developed photographic film, the magnetic signal recorded by the recording head is recorded by the recording head. An electric signal is immediately reproduced by the reproducing head on the downstream side, and the amplitude value of the electric signal obtained from this reproducing head is compared with a predetermined reference value for judging that the recording head and the reproducing head are in a normal state. Compare by means. Then, when the comparison means determines that the voltage value of the electric signal indicating the high level is equal to or lower than the predetermined reference value, the warning means indicates that at least one of the recording head and the reproducing head is clogged. Warning.

Thus, when the magnetic head is clogged, the clogging of the magnetic head can be removed by cleaning or the like.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a magnetic recording / reproducing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view showing an embodiment of a photographic film applied to a magnetic recording / reproducing apparatus according to the present invention.

The film cartridge 110 shown in FIG.
Has a single spool 112, and this spool 112
A photo film 114 is wound around. The photo film 114 is provided with perforations 114A that indicate the positions of the frames. Further, the photographic film 114 is provided with a transparent magnetic recording layer, and the magnetic tracks 114B and 114C are formed at the edges thereof. The magnetic track 114B is used in the lab or DPE.
A magnetic track 11 which is a truck used at an agency.
4C is a track used by the user.

Here, of the film of one roll, the first
The leading end side of the film relative to the perforation 114A indicating the position of the frame is called a leader portion, and the magnetic track 1
The magnetic track of the leader section of 14C is called a leader track. The rear end side of the perforation 114A indicating the position of the first frame is called a frame portion, and the magnetic track of the frame portion is called a frame track. Then, the magnetic information of the entire roll is recorded on the leader track, and the magnetic information of each frame is recorded on the frame track.

Magnetic information is recorded on these tracks by a camera having a magnetic head, a film reproducing device, or the like. The magnetic information recorded by the camera may be, for example, shooting conditions, pseudo zoom information, frame numbers, print formats indicating any of high-definition images, panoramic images and normal images, shooting date / time, etc. Many kinds of information can be recorded by the camera.

FIG. 2 is a block diagram showing an embodiment of a film reproducing apparatus to which the magnetic recording / reproducing apparatus according to the present invention is applied. As shown in the figure, the film reproducing apparatus mainly includes a control unit 50, a magnetic recording / reproducing unit 52, and an optical data reading unit 5.
4, a film driving mechanism 56, a clogging sensor 62, a display unit 64, and the like.

In the film reproducing apparatus, when the film is loaded, first, pre-scan is performed so that A of each frame image is displayed.
The optical information necessary for image reproduction such as E / AWB and the magnetic information recorded on the magnetic track are read, and then the main scan is performed using these information to read the frame image displayed on the monitor. At this time, in the present film reproducing apparatus, pre-scanning is performed by conveying the photo film 114 in the direction of sending the photo film 114 from the film cartridge 110 (hereinafter referred to as the sending direction), and performing the main scan in the direction of rewinding the photo film 114 to the film cartridge 110. (Hereinafter, it is referred to as the rewinding direction). The film reproducing apparatus can edit magnetic information, and the newly edited magnetic information is recorded by rewinding the film when the film cartridge is taken out from the apparatus at the end of film reproduction. .

By the way, the present invention relates to recording and reproducing of magnetic information and is applied regardless of the processing procedure of such a film reproducing apparatus. That is, the present invention works only during a scan in which recording / reproduction of magnetic information is performed, and is applicable to any processing procedure for this scan. Therefore, hereinafter, the reproduction of the magnetic information is performed at the time of pre-scan film feeding conveyance (right direction in the figure), and the recording of the magnetic information is performed at the time of film rewinding conveyance when the film cartridge is taken out (left direction in the figure). However, the present invention is not limited to such a case.

First, the operation of each control unit shown in the figure will be described based on the prescan when the film cartridge is loaded. In the film reproducing apparatus shown in FIG. 1, when the film cartridge 110 shown in FIG. 1 is loaded into the film reproducing apparatus, first, the film driving mechanism 56 rotates the spool 112 in the feeding direction to rotate the film cartridge 110.
Photo film 114 sent out from Photo Film 11
The front end of No. 4 is attached to the winding shaft 58. And after this,
Perform prescan. That is, the winding shaft 58 is attached to the spool 11
Rotate in the feeding direction at the same time as 2 to take photo film 1
14 is wound around the take-up shaft 58, the photographic film 114 is conveyed in the feeding direction at a constant speed, and the frame image recorded on the photographic film 114 and the magnetic information recorded on the magnetic track are read.

The perforation 114A provided in each frame of the photographic film 114 is used to control the conveyance of the photographic film 114. The perforation 114A is the optical sensor 54 of the optical data reading unit 54 in FIG.
A is detected, and the film transport speed, the reading position of each frame image, and the recording / reproducing position of magnetic information are controlled depending on the timing and the number of times when this perforation 114A is detected.

The frame image recorded on the photographic film 114 is read by the image reading section 60 shown in FIG. The image reading unit 60 is a CCD line sensor 60 shown in FIG.
The photo film 114 including A is emitted from the light source 61.
This CCD line sensor 60A photoelectrically converts the light that has passed through, and the frame images recorded on the photographic film 114 are sequentially converted into electric signals line by line.
Then, the optical information for each frame image is detected based on this electric signal and used as the frame image read information at the time of the main scan. During the main scan, the CCD
The line sensor 60A converts the frame image into an electric signal, performs various signal processing on the electric signal to generate a video signal, and outputs the video signal to the display unit 64.

Reproduction of the magnetic information recorded on the photographic film 114 is performed by the magnetic recording / reproducing unit 52 in the figure. The magnetic recording / reproducing unit 52 includes magnetic heads 52A and 5A in FIG.
2B, and these magnetic heads are appropriately used by switching between a reproducing magnetic head (reproducing head) and a recording magnetic head (recording head). When reproducing the magnetic information recorded on the photographic film 114 as in the pre-scan, these magnetic heads 52A and 52B are used.
Of these, the magnetic head on the upstream side in the film transport direction is used as a reproducing head. That is, when the film is conveyed rightward in the figure as in the prescan, the magnetic head 52A in the figure is used as the reproducing head.

When recording the magnetic information edited by the film reproducing apparatus on the photographic film 114, the downstream magnetic head in the film transport direction is used as a reproducing head and the upstream magnetic head is used as a recording head. use.
At this time, the reproducing head is required to detect clogging of the magnetic head, which will be described later.

Next, the operation of the clogging sensor 62 shown in FIG. 2 will be described in detail. First, the principle of the clogging sensor 62 will be described. When clogging occurs in the reproducing head of the magnetic heads 52A and 52B, when the magnetic information recorded on the photographic film is reproduced, an electric signal output from the reproducing head is output. The signal strength of the signal becomes weaker than in the normal case.

On the other hand, when the magnetic head is clogged,
When the magnetic information is recorded on the photographic film, the signal strength of the magnetic signal recorded on the magnetic track 114C becomes weaker than that in the normal case. Therefore, when clogging occurs in the reproducing head, the clogging can be detected from the magnitude of this strength by detecting the signal strength of the electric signal output from the reproducing head. When the recording head is clogged, the recorded magnetic information can be reproduced and detected from the signal strength of the reproduced electric signal.

By the way, the clogging of the reproducing head at the time of reproducing the magnetic information can be detected from the electric signal output from the reproducing head at the same time as the reproduction of the magnetic information, but at the time of recording the magnetic information. The clogging of the recording head cannot be detected without reproducing the magnetic information after recording the magnetic information. However, when the recording and reproducing magnetic heads are provided as in the present film reproducing apparatus, when recording magnetic information, the upstream side in the film transport direction is the recording head and the downstream side is the reproducing head. If the recording head records magnetic information and the reproducing head reproduces the recorded magnetic information, the clogging of the recording head can be detected based on the electric signal output from the reproducing head. .

In this case, however, it cannot be determined whether the recording head is clogged or the reproducing head is clogged, but at least when one of the magnetic heads is clogged, this can be detected. Further, unlike the above-mentioned film reproducing apparatus which uses two magnetic heads by switching between recording and reproducing, when two magnetic heads are determined for recording and reproducing, when recording magnetic information. It is only necessary to decide which direction the film will be transported.

Furthermore, in the case where the magnetic head is a single head for both recording and reproduction, if the magnetic information is recorded and then the magnetic head is switched to the reproducing mode to reproduce the recorded magnetic information, the magnetic head will be read. The clogging can be detected. FIG. 3 is a block diagram showing the configuration of the clogging sensor 62 in the magnetic recording / reproducing apparatus according to the present invention.

The magnetic heads 52A and 52B shown in the figure are used by appropriately switching between the reproducing and recording magnetic heads as described above. When reproducing the magnetic information by transporting the film in the feeding direction as in the prescan, the magnetic head 52A on the upstream side in the film feeding direction (feeding feeding direction) serves as the reproducing head (the magnetic field on the downstream side). Head 52
B may be a reproducing head). On the other hand, when recording the magnetic information by transporting the film in the rewinding direction such as when taking out the film cartridge, the magnetic head 52B on the upstream side in the film transporting direction (rewinding transporting direction) is the recording head and the downstream. The magnetic head 52A on the side serves as a reproducing head.

When recording / reproducing magnetic information, the switch 62D of the clogging sensor 62 is switched to the reproducing head side, and the output signal from the reproducing head is taken into the clogging sensor 62. An output signal from the reproducing head is amplified by an amplifier 62A and then output to an envelope detection circuit 62B. An electric signal (envelope signal) indicating an envelope of the output signal from the reproducing head from the envelope detection circuit 62B. ) Is output to the A / D converter 62C.

The magnetic information of the photographic film 114 is recorded as a digital signal, and the electric signal output from the reproducing head is a pulse signal having a constant amplitude modulated at a predetermined frequency. Therefore, the envelope signal output from the envelope detection circuit 62B becomes a pulse signal obtained by demodulating the modulated pulse signal. The A / D converter 62C performs A / D conversion at each timing at which the pulse signal is output from the envelope detection circuit 62B, and the amplitude value of each pulse is controlled by the control unit 50.
Output to.

Based on the amplitude value of the pulse signal output from the A / D converter 62C, the control unit 50 uses a predetermined determination level to determine whether it is normal, clogging or unrecorded. In this case, a cleaning instruction display (a magnetic head clogging warning display) is displayed on the display unit 64.
FIG. 4 is a flowchart showing a procedure for determining clogging when reproducing magnetic information.

At the time of reproducing the magnetic information, the digital signal indicating the amplitude value of the pulse signal recorded on the magnetic track as described above is output from the clogging sensor 62 to the controller 50 for each pulse (step S10). The control unit 50
Whether magnetic information is recorded on the magnetic track based on the digital signal output from the clogging sensor 62,
If recorded, it is determined for each pulse whether the magnetic head is normal or clogged (step S12).

That is, an upper limit value a for determining that magnetic information is not recorded on the magnetic track and a lower limit value b for determining that the magnetic head is normal are preset, and if the value En of the digital signal is En ≦ In the case of a, it is determined as unrecorded (step S14), and in the case of b ≦ En, it is determined as normal (step S16). In the case of these determination results, the reproduction of the magnetic information is continued as it is.

On the other hand, if the value En of the digital signal is a <En
If <b, it is determined to be a clogging (step S1).
8). In this case, the reproduction of the magnetic information is stopped, the film cartridge is ejected (step S20), and the display unit 6
A cleaning instruction is displayed on 4. FIG. 5 is a flowchart showing a procedure for determining clogging when recording magnetic information.

At the time of recording the magnetic information, a digital signal indicating the amplitude value of the pulse signal recorded on the magnetic track is read from the clogging sensor 62 to the control section 50 for each pulse via the reproducing head located downstream of the recording head. It is output (step S30). The control unit 50 determines whether the magnetic head is normal or clogged based on the digital signal output from the clogging sensor 62 in the same manner as described above (step S32). Although there was a case where the magnetic information was not recorded when the magnetic information was reproduced, when the magnetic information was recorded, the magnetic information was recorded by the upstream magnetic head. Therefore, the magnetic information was reproduced by the downstream magnetic head. If the magnetic information is not recorded, it does not exist.

If the digital signal En output from the clogging sensor 62 is above the judgment level b (b≤En).
In this case, the magnetic head is determined to be normal, and recording of magnetic information is continued (step S34). On the other hand, En is En
If <b, it is determined to be clogged (step S36),
The recording of the magnetic information is stopped, and the film cartridge is ejected from the film reproducing device (step S38). Then, a cleaning instruction is displayed on the display unit 64 (step S40).

As described above, when the magnetic head is clogged, the film reproducing apparatus stops recording and reproducing magnetic information and displays a cleaning instruction on the display section 64. . In the above embodiment, the clogging is determined for each pulse from the amplitude value of each pulse of the pulse signal output from the envelope detection circuit 62B.
Not limited to this, the time constant of the envelope detection circuit 62B and the A / D conversion timing of the A / D converter may be determined so that the signal strength of the electric signal obtained from the reproducing head can be detected.

[0040]

As described above, according to the magnetic recording / reproducing apparatus of the present invention, the clogging of the magnetic head is detected based on the amplitude value of the electric signal output from the reproducing head during the recording / reproducing of the magnetic signal. Since a warning is issued when a clogging is detected, when a clogging warning is issued, the magnetic head is cleaned so that the recording / reproduction of the magnetic signal is not performed as it is. Therefore, it is possible to prevent erroneous recording / reproduction of magnetic signals.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a photographic film applied to a film reproducing apparatus according to the present invention.

FIG. 2 is a configuration diagram showing an embodiment of a film reproducing apparatus according to the present invention.

FIG. 3 is a block diagram showing a configuration of a clogging sensor 62 in the magnetic recording / reproducing apparatus according to the present invention.

FIG. 4 is a flow chart showing a procedure for determining clogging when reproducing magnetic information.

FIG. 5 is a flow chart showing a procedure for determining clogging when recording magnetic information.

[Explanation of symbols]

 50 ... Control unit 52 ... Magnetic recording / reproducing unit 52A, B ... Magnetic head 54 ... Optical data reading unit 56 ... Film driving mechanism 60 ... Image reading unit 62 ... Clog sensor 62A ... Amplifier 62B ... Envelope detection circuit 62C ... A / D converter 62D ... switch 64 ... display section

Claims (2)

[Claims] 1. A magnetic recording / reproducing apparatus for reproducing a magnetic signal recorded on a magnetic track on a developed photographic film into an electric signal by a magnetic head, wherein an electric signal obtained from the magnetic head is reproduced when the magnetic signal is reproduced. Comparing means for comparing the amplitude value with a first reference value for determining that the magnetic head is in a normal state and a second reference value for determining that magnetic recording is performed; Warning means for warning that the magnetic head is clogged when it is determined that the voltage value of the electric signal indicating the high level is equal to or higher than the second reference value and equal to or lower than the first reference value. A magnetic recording / reproducing apparatus characterized by being provided. 2. An electric signal is converted into a magnetic signal by a recording head and recorded on a magnetic track on a developed photographic film, and the recorded magnetic signal is immediately transferred to an electric signal by a reproducing head on the downstream side of the recording head. In a magnetic recording / reproducing apparatus for reproducing information in the above-mentioned manner, an amplitude value of an electric signal obtained from the reproducing head at the time of recording is compared with a predetermined reference value for judging that the recording head and the reproducing head are in a normal state. And a warning that at least one of the recording head and the reproducing head is clogged when the voltage value of the electric signal indicating the high level is determined to be less than or equal to the predetermined reference value by the comparison means. A magnetic recording / reproducing apparatus comprising: