JP2001101630A - Film for inspecting magnetic head, magnetic information reproducing device and camera capable of inspecting magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of rapidly, easily and surely deciding the state of reproducing ability such as dirt of a magnetic head, abnormality of azimuth or others, of a magnetic information reproducing device of a camera, automatic developing device, etc. SOLUTION: This film for inspecting the magnetic head of the magnetic information reproducing device of the camera, developing processor, etc., has such a feature that the size of a residual magnetic signal magnetically recorded on a magnetic recording part or the recording azimuth is being changed in rising order or falling order in the longitudinal direction, and the magnetic information reproducing device is provided such as capable of judging the property of the magnetic head by this film for inspection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic film for a camera having a magnetic head capable of recording or reading information on the magnetic recording portion of a photographic film having a substantially transparent magnetic recording layer (magnetic recording portion). The present invention relates to an information reproducing apparatus and an inspection film for inspecting the reading performance of the magnetic head.

[0002]

2. Description of the Related Art In a photographic system comprising a photographic film, a camera, a developing processor and the like, a substantially transparent magnetic recording layer is used as a means for easily exchanging information between the photographic film, the camera and the developing processor. (Magnetic recording section) is provided on the entire back surface of a photographic film, and a system for magnetically recording necessary information directly on the photographic film is disclosed in International Publication W090 / 042.
5, WO 90/04214, U.S. Pat.
No. 912467 and U.S. Pat. No. 4,876,697. That is, shooting conditions (for example, color temperature of light source, subject brightness, exposure time, aperture, presence or absence of backlight, presence or absence of flash light, presence or absence of continuous shooting, shooting date,
The print size and the photographer's memo) are magnetically recorded for each film frame. After processing the photographic film with a processor, the information magnetically recorded on the photographic film is read, and the read information is combined with the optical density data obtained by scanning the photographic film to make a judgment. Determine the printing conditions for printing. It has also been proposed that if printing conditions for printing are magnetically recorded for each photographed frame of a photographic film and read out during additional printing, a print having the same color tone as at the beginning can be obtained.

[0003]

A camera for a photographic film having a magnetic recording section optically exposes an image to the photographic film at the time of photographing and simultaneously records photographing information in a magnetic recording section of a photographing frame. Utilizing this magnetic information, even in a state where unexposed frames still remain during shooting, the photographic film is once rewound into the patrone and stored, the patrone is taken out of the camera, and the patrone is loaded into the camera again. There is a camera that can continue shooting from an unexposed frame (hereinafter, referred to as a camera that can be taken out halfway). In such a camera that can be taken out halfway, when reloading a photographic film taken out during shooting, the exposure frame / unexposed frame is determined based on the presence or absence of a magnetic signal of a magnetic recording unit.
In other words, if the exposed frame of the photographic film has a magnetic signal, it determines that the frame has been exposed and does not perform exposure. If there is no magnetic signal, the camera determines that the frame has not been exposed and the camera displays the frames that can be shot. do. In this case, the determination of the presence / absence of the magnetic signal is made by comparing with a preset threshold value (V _L ).
As there output threshold (V _L) is greater than the magnetic signal of the magnetic signal read, so as to determine a threshold value (V _L) None smaller than a magnetic signal.

Since the magnetic head of such a camera is in direct contact with the photographic film, if dust on the photographic film accumulates on the magnetic head, a space is created between the photographic film and the magnetic head. In this state, if a photographic film being shot is reloaded into the camera, the magnetic signal output of the photographic film decreases due to the space caused by the deposits, and there is a possibility that an exposed frame that has been shot is erroneously determined as an unexposed frame. Come. If the exposure frame is erroneously determined to be an unexposed frame and exposure is performed again, double exposure occurs, and the captured image cannot be used.

[0005] In a magnetic information reproducing apparatus such as an automatic development processor which reads magnetic information magnetically recorded on a photographic film at a developing station or the like and uses the magnetic information as printing conditions when printing from the photographic film onto photographic paper, a photograph to be processed is used. Due to the large number of films, developer residue on the photographic film easily accumulates on the magnetic head, and the magnetic signal output of the photographic film is reduced due to the space caused by the deposits, making it difficult to read the magnetically recorded information. become.

[0006] When the reading ability is deteriorated due to such deposits on the magnetic head, it is convenient to have some mechanism for urging the operator to clean the magnetic head. However, if it is determined that the magnetic recording cannot be read with a camera that can be taken out halfway, it may be due to a decrease in the output of the magnetic signal due to deposits on the magnetic head. It is not possible to determine whether or not is due to unrecorded. Even if it is found that the output of the magnetic signal is reduced, it may be due to deposits on the magnetic head when reading out the magnetic information reproducing device, whether the magnetic signal itself when magnetically recorded by a camera or the like is low, or whether the magnetic head It is not possible to judge whether it is caused by an abnormality of the vehicle.

[0007] In a camera or a development processing machine production site, the assembled state of the magnetic head is only assumed in advance according to the dimensional accuracy at the time of design. Inspection equipment is not done because it is expensive. In particular, no method has been proposed for quickly, accurately, and inexpensively inspecting the azimuth state of a magnetic head, which is important in assembling the magnetic head. Here, the azimuth refers to the inclination of the gap of the magnetic head. If the azimuth is increased due to a badly assembled state of the magnetic head, the output loss of the magnetic signal is increased. In other words, when the azimuth increases, the attenuation of the magnetic signal increases, and the magnetic signal falls below the threshold value (V _L ), and the magnetically recorded frame is determined to be unrecorded.

[0008] An object of the present invention is to solve the above problems,
Using a magnetically recorded inspection film,
It is an object of the present invention to provide a method capable of quickly, simply, and reliably determining the state of a reproduction capability such as contamination of a magnetic head of a magnetic information reproducing apparatus such as a camera and an automatic developing machine, azimuth and other abnormalities.

[0009]

The above object has been attained by the following constitutions.

[0010] 1. The magnitude of the remanent magnetic signal magnetically recorded on the magnetic recording unit is ascending or descending in the longitudinal direction,
Inspection film characterized by changes.

2. 2. The inspection film according to the above item 1, wherein the magnitude of the residual magnetic signal magnetically recorded in the magnetic recording section changes for each frame.

3. 2. The inspection film according to the above item 1, wherein the magnitude of the residual magnetic signal magnetically recorded in the magnetic recording section is continuously changing.

4. At least a part of the magnetic recording unit,
The inspection film according to any one of the above items 1 to 3, wherein no magnetic recording is performed.

5. The part where the magnetic recording is not performed,
5. The inspection film according to the item 4, wherein the film has one or more frames.

6. 6. The inspection film according to any one of 1 to 5, wherein a recording azimuth of a residual magnetic signal magnetically recorded in the magnetic recording unit is constant.

[7] The recording density of the residual magnetic signal magnetically recorded in the magnetic recording section is constant.
7. The film for inspection according to any one of items 6 to 6.

8. An inspection film, wherein a recording azimuth of a residual magnetic signal magnetically recorded in a magnetic recording portion changes in an ascending or descending order in a longitudinal direction.

9. 9. The inspection film according to the above item 8, wherein a recording azimuth of a residual magnetic signal magnetically recorded in the magnetic recording unit changes for each frame.

10. 10. The inspection film according to the above item 9, wherein the recording azimuth of the residual magnetic signal magnetically recorded in the magnetic recording portion changes continuously.

11. At least a part of the magnetic recording unit is not magnetically recorded.
The inspection film according to any one of items 10 to 10.

[12] 12. The inspection film as described in 11 above, wherein the inspection film has one or more frames where the magnetic recording is not performed.

13. (8) The residual magnetic signal magnetically recorded in the magnetic recording section has a constant magnitude.
13. The inspection film according to any one of items 12 to 12.

14. 14. The inspection film according to any one of 8 to 13, wherein the recording density of the residual magnetic signal magnetically recorded on the magnetic recording unit is constant.

[15] In a magnetic information reproducing apparatus for a photographic film having a magnetic recording part, the magnitude of the residual magnetic signal or the recording azimuth magnetically recorded in the magnetic recording part is changed in the ascending or descending order in the longitudinal direction. A magnetic information reproducing apparatus comprising: output detection means for detecting a magnitude of a signal; and determination means for determining a state of a magnetic head from a detection result by the output detection means.

16. In a magnetic information reproducing apparatus for a photographic film having a magnetic recording portion, the magnitude of the residual magnetic signal or the recording azimuth magnetically recorded on the magnetic recording portion is magnetically recorded on a test film in which the magnitude or recording azimuth changes in ascending or descending order in the longitudinal direction. A magnetic information reproducing apparatus, comprising: an information number measuring means for measuring the number of information; and a judging means for judging a state of a magnetic head from a result of measurement by the information number measuring means.

17. In a magnetic information reproducing apparatus for a photographic film having a magnetic recording portion, the magnitude of the residual magnetic signal or the recording azimuth magnetically recorded on the magnetic recording portion is magnetically recorded on a test film in which the magnitude or recording azimuth changes in ascending or descending order in the longitudinal direction. A magnetic information reproducing apparatus comprising: decoding means for decoding information; and determination means for determining a state of a magnetic head from a signal decoded by the decoding means.

18. In a magnetic information reproducing apparatus for a photographic film having a magnetic recording portion, the magnitude of the residual magnetic signal or the recording azimuth magnetically recorded on the magnetic recording portion is magnetically recorded on a test film in which the magnitude or recording azimuth changes in ascending or descending order in the longitudinal direction. A magnetic information reproducing apparatus comprising: a determination unit configured to determine a state of a magnetic head from information on a print size to be printed.

19. In a photographic film camera having a magnetic recording section, the magnitude of the residual magnetic signal of a test film in which the magnitude or recording azimuth of a residual magnetic signal magnetically recorded in the magnetic recording section changes in ascending or descending order in the longitudinal direction. A camera comprising: an output detection unit that detects a state of the magnetic head; and a determination unit that determines a state of the magnetic head from a detection result by the output detection unit.

20. In a photographic film camera having a magnetic recording portion, the magnitude of the residual magnetic signal or the recording azimuth magnetically recorded in the magnetic recording portion changes in ascending or descending order in the longitudinal direction. A camera comprising: an information number measuring means for measuring the number of information; and a judging means for judging a state of the magnetic head from the number of information measured by the information number measuring means.

21. In a photographic film camera having a magnetic recording portion, the magnitude of the residual magnetic signal or the recording azimuth magnetically recorded in the magnetic recording portion is changed in ascending or descending order in the longitudinal direction. A camera comprising: a determination unit configured to determine a state of a magnetic head from position information.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view showing an example of the inspection film of the present invention.

Incidentally, in the drawings described hereinafter, F indicates all films and indicates both an inspection film and a photographic film.

In FIG. 1, as the inspection film F, a photographic film capable of taking a picture, in which a photosensitive layer was coated on one side of a polyethylene naphthalate support and a magnetic recording layer was coated on the back side, was used as it was. There is no particular limitation as long as it is a photographic film-like film which can be loaded into a camera or an automatic processing machine, has a magnetic recording section, and has a perforation capable of determining the position of a photographed frame. It doesn't matter if it doesn't.

The magnetic tracks 1 to 4 are formed at both ends in the width direction (vertical direction in the drawing) of the inspection film F.
Two frames are provided in an area that does not cover the photographing frames 12 (hereinafter, may be simply referred to as frames) and that is shorter than the longitudinal direction (horizontal direction in the figure) of the photographing frames 12. Imaging conditions at the time of camera imaging are magnetically recorded on the magnetic tracks 1 to 4 for each frame of the inspection film F.
Perforations 10 that clearly indicate the position of the shooting frame 12
Are formed at one end in the width direction at predetermined intervals, and the perforations 10 are used for controlling the magnetic recording / reproducing position of the photographed frame and for positioning when exposing the image of the photographed frame.

FIG. 2 is a conceptual diagram showing a magnetic information recording apparatus for performing a magnetic recording by changing the magnitude of the residual magnetic signal or the recording azimuth after the magnetic recording to produce the inspection film of the present invention. Reference numeral 40 denotes a magnetic information recording apparatus main body, which includes a lower guide 43 for supporting the inspection film F. The inspection film F is sandwiched between the transport motors 44 and 46 and the transport rollers 45 and 47 provided at positions facing the motors and transported in the direction of arrow D. LED41
The perforation sensor 42 that receives the light is disposed at a position where the perforation 10 of the inspection film F passes, and can detect the perforation 10. The physical frame position of the inspection film F is obtained from the detection signal from the perforation sensor 42. A magnetic head 49 is provided below the rotary stage 52 downstream of the perforation sensor 42. The rotation stage 52 includes a controller 120
The angle is changed in the yaw direction (the direction of rotation about an axis perpendicular to the film surface) by the stepping motor 51 driven by the control signal of (1). The magnetic head 49 is disposed at a position where the magnetic tracks 1 to 2 or the magnetic tracks 3 to 4 of the inspection film F pass.
9 and the magnetic head supporting roller 48, the inspection film F
And the magnetic head 49 is pressed against the inspection film F to perform magnetic recording. The signal of the magnetic recording is transmitted to the controller 12 which has received the detection signal of the perforation sensor 42.
0 controls the transport motors 44 and 46 to determine the position of the magnetic track for each frame while transporting the inspection film F, and sends a magnetic recording signal to the driver circuit 32. The driver circuit 32 moves the recording circuit 30 in accordance with the magnetic recording signal to supply a recording current to the magnetic head 49, a magnetic field is generated in the magnetic head 49 by the recording current, and the magnetic field is applied to the inspection film F in contact with the magnetic head 49. A record is made. As a result, the magnetic information recording apparatus can be used for the inspection film F
The magnetic signal can be accurately written at the positions of the magnetic tracks 1 to 2 or the magnetic tracks 3 to 4 for each frame.

FIG. 3 is a block diagram of a recording circuit of the magnetic information recording apparatus of FIG. The DC constant voltage source 31 supplies a recording current I flowing to the magnetic head 49. The value of the supply current I is determined by selecting any one of the switches S10 to S13 from the switches S10 to S13, and the write current I is the current flowing through the coil L of the magnetic head 49 by the circuits of the switches S1 to S4. By changing the direction, a magnetic field is generated by the magnetic head 49, and magnetic recording is performed on the magnetic recording portion of the inspection film F in contact with the magnetic head 49.

The inspection film in which the magnitude of the residual magnetic signal according to the present invention is changed in the ascending or descending order in the longitudinal direction is defined as the inspection film and the magnetic reproduction when reproducing the magnetically recorded inspection film. When the physical contact conditions with the head (pressing pressure of the magnetic head support roller, transport speed of the inspection film, etc.) and the loss conditions during recording and reproduction of the magnetic head (azimuth loss, eddy current loss, etc.) are fixed. To
This is an inspection film in which the magnitude of a residual magnetic signal read from a magnetic reproducing head brought into contact with a magnetic recording unit changes for each photographing frame. Hereinafter, for convenience, this inspection film is referred to as an output inspection film. Changing in ascending or descending order means that the magnitude of the residual recording signal is small → large or large → small in the longitudinal direction (in the direction of feeding the inspection film when loaded in a camera or a magnetic information reproducing apparatus). The magnitude of the residual magnetic signal may change for each frame, or may change continuously for a plurality of frames regardless of the frame. The outer side of the portion of the output inspection film where the magnetic recording is magnetically recorded has the smallest residual magnetic signal (in the longitudinal direction, when the magnitude of the residual magnetic signal is recorded in ascending order from small to large, the size is one point). It is preferable to provide an unrecorded portion that is not magnetically recorded outside the first recording position (outside the last recording position when recording is performed in descending order from large to small). Furthermore, in determining the state of the magnetic head using the output inspection film,
Using the fact that only the magnitude of the residual magnetic signal changes in the longitudinal direction makes it easier to identify the cause of poor read performance of the magnetic head, so the recording azimuth and recording density during magnetic recording must be constant Is preferred.

As a method for changing the magnitude of the residual magnetic signal in the magnetic recording portion of the output test film, for example,
The magnitude of the recording current flowing through the coil of the magnetic head 49 shown in FIG. 2 is changed to change the absolute intensity of the magnetic signal recorded on the film, or the steepness of the rising of the recording current is changed to change the residual magnetism. There is a way to change the rate of change.

Here, a method of changing the residual magnetic signal by changing the magnitude of the recording current will be described. Magnetic head 49
The operation of the switch for selecting the value of the recording current I flowing through the switch S1 will be described in detail.
It is determined by the resistance values of R10 to R13 selected from 0 to S13. When the voltage of the constant voltage power supply 31 is Vcc and the DC resistance of the magnetic head 49 is Hr, the recording current I flowing when the switch S11 in FIG. 3 is closed is Vcc / (R
11 + Hr), and the recording current I decreases as the selected resistance value increases. The controller 120 selects a switch for each frame at the position of the magnetic tracks 1 to 2 or the magnetic tracks 3 to 4 of the output inspection film F from the detection signal of the perforation sensor 42 to change the value of the recording current I, The magnitude of the residual magnetic signal of the output inspection film can be changed. In the present embodiment, the setting of the recording current is provided in four stages. However, the present invention is not limited to the number of the settings, and is not limited to a stepwise change by a switch. If the resistance value is continuously varied by a motorized potentiometer or the like that can be directly controlled, the residual magnetic signal of the output inspection film F can be continuously changed.

A method of producing an inspection film (hereinafter, referred to as an azimuth inspection film) in which the recording azimuth is changed in ascending or descending order in the longitudinal direction of the present invention, which will be described later, is as follows. This can be achieved by driving and magnetically recording the magnetic head 49 provided below the rotary stage 52 at different angles for each frame of the inspection film F. Hereinafter, when simply referred to as an inspection film, it refers to both the output inspection film and the azimuth inspection film.

The operation of the switch for changing the direction of the recording current I supplied to the magnetic head 49 will be described in detail. The circuits of the switches S1 to S4 simultaneously close the switches S1 and S3 in response to a switch opening / closing signal from the driver circuit 32. When the switches S2 and S4 are simultaneously opened, the recording current I passes through the switch S1 and the coil L of the magnetic recording head.
(Downward in the figure) and returns through the switch S3. Next, when the switches S2 and S4 are simultaneously closed and the switches S1 and S3 are simultaneously opened by the open / close signal of the driver circuit 32,
The recording current I flows to the coil L through the switch S2 (upward in the figure) and returns to the power supply 31 through the switch S4. By changing the direction of the recording current I, a magnetic field is generated by the magnetic head 49 and is magnetically recorded on the inspection film. The controller 120 can send an arbitrary number of magnetic recording signals with arbitrary recording contents to the driver circuit 32 and perform magnetic recording on the inspection film F.

FIG. 4 is a conceptual diagram showing an example of the camera of the present invention for performing magnetic recording and reproduction on a photographic film having a magnetic recording layer.

The camera body 20 is loaded with the cartridge 15 containing the photographic film F. Shooting lens 2
Exposure is performed on the photographic frame of the photographic film F through 2, and the photographic film F wound around the spool 16 in the cartridge 15 is taken up on the take-up reel 21 of the camera 20 and fed. On the side of the magnetic recording unit provided on the side opposite to the surface facing the taking lens 22 of the photographic film F, a magnetic head 24 for both magnetic recording and reproduction is provided through the pressure plate 23, and the magnetic head of the photographic film F is provided. When one of the tracks 1 to 4 (see FIG. 1) is contacted,
Or perform reproduction. The operation of magnetic recording or reproduction is controlled by the control circuit 180 via the magnetic information circuit 50. In addition, L across the conveyance path of the photographic film F
An ED 25 and a perforation sensor 26 are provided. The perforation sensor 26 is disposed at a position where the perforation 10 of the photographic film F passes, and detects a frame position exposed by the camera 20 at the time of photographing and a position of the magnetic recording unit. I do.

FIG. 5 is a block diagram of the magnetic information circuit of the camera shown in FIG.

First, the operation of the magnetic information circuit 50 when magnetic recording is performed on a photographic film at the time of photographing will be described. R /
At the time of recording, the W switch 63 is switched to the recording circuit 62 side during recording by the control circuit 180 to enter the magnetic recording mode.
The recording circuit 62 and the driver circuit 61 are the same as the recording circuit and the driver circuit of FIG. 1, and transmit a magnetic recording signal to the photographic film F from the control circuit 180 to the driver circuit 61. When a signal for generating a recording current is sent to the recording circuit 62 based on the recording current, the recording current flows through the magnetic head 24 and magnetic recording is performed on the photographic film F. The information recorded magnetically is the shooting conditions,
For example, the control circuit 180 uses the signal from the perforation sensor 26 at the time of feeding the photographic film F based on the color temperature of the light source, the brightness of the subject, the exposure time, the print size (C size, H size, P size, etc.), etc. Magnetic recording can be performed accurately at the magnetic recording tracks 1 to 2 or the magnetic tracks 3 to 4 for each frame of the film F.

Next, when reproducing the magnetic signal at the time of reloading the photographic film F taken out in a state where the image is not exposed to all the photographic frames of the photographic film F (in the state where there are unexposed frames), The operation of the information circuit 50 will be described.
When reloading, the R / W switch 63 is switched to the amplification circuit 64 side by the control circuit 180 to enter the reproduction mode. The signal a indicates the residual magnetism of the photographic film F by the magnetic head 2.
In the magnetic signal reproduced in 4, the signal a becomes a magnetic signal b whose amplitude is amplified by the amplifier circuit 64, and is sent to the demodulation circuit 65 and the comparison circuit 66. At this time, the magnetic head 24 is an output detection unit. The demodulation circuit 65 as a decoding means decodes the signal b, sends the decoded signal to the control circuit 180, and determines the content of the recorded information. At the same time, the demodulation circuit 65 sends the decoded signal to the counter circuit 67, and the counter circuit 67 as the information number measuring means.
Measures the number of decoded signals. On the other hand, the amplification circuit 6
The magnetic signal b amplified at 4 and sent to the comparison circuit 66 is compared with a preset value _VL . This set value V _L
Is a threshold for detecting the presence or absence of a magnetic signal of the photographic film F,
If the output of the amplified magnetic signal b is larger than _VL , the comparison circuit 66 determines that the magnetic signal is present on the photographic film F and outputs the signal c.
Is output to High. By the way, the photographic film F has a section where no magnetic recording section exists between frames. For this reason, the control circuit 180 outputs a position at which no magnetic signal exists according to a signal from a perforation sensor (not shown) as a signal d to High, and sums a signal c indicating presence or absence of a magnetic signal from the comparison circuit with a signal e (e = c + d). )
It is determined whether or not there is a magnetic signal of the magnetic track for each final frame. When the output of the signal e is Low, the control circuit 180 determines that there is no magnetic signal in the frame of the photographic film and determines that the frame is not exposed, and controls a feeding motor (not shown) to stop at the corresponding frame position to complete the preparation for shooting. I do.

FIG. 6 shows an example of the waveform of the magnetic information circuit when a photographic film is reloaded into the camera of the present invention. In FIG. 6, as an example of the signal, the first frame and the second frame of the photographic film
The top frame is magnetically recorded and has a magnetic signal due to residual magnetism, but the third frame is unrecorded and shows only noise. The magnitude of the residual magnetic signal is larger in the first frame than in the second frame. The recording azimuth and the recording density are constant. FIG. 6B shows the magnetic signal b of the amplifying circuit 64 which amplifies the output of the magnetic signal a of the photographic film from the magnetic head 24 described in FIG. 5 by a solid line, and the threshold value _{VL of the} comparison circuit by a dotted line. It is. FIG. 6C shows an output signal c from the comparison circuit 66. Since the signal b of the first and second frames sent from the amplifier circuit 64 is higher than the threshold value _VL , the magnetic signal is applied to the photographic film F. High is output as a signal is present, and Low is output as no magnetic signal because the noise of the third frame is lower than the threshold value _VL . FIG. 6D shows a signal d indicating a position between frames where the magnetic recording portion of the photographic film does not exist, and FIG. 6E finally shows the presence / absence of a magnetic signal of a magnetic track of the photographic film for each frame. Signal e
(E = c + d).

Next, the details of the azimuth inspection film in which the recording azimuth of the residual magnetic signal magnetically recorded on the magnetic recording portion in the longitudinal direction of the present invention has changed will be described. Azimuth is the inclination of the gap of the magnetic head in the yaw direction.
When the gap between the magnetic recording head and the magnetic reproducing head is inclined by φ, if W is the track width of the magnetic recording head and λ is the magnetic recording wavelength, the output loss L (dB) of the magnetic signal at the magnetic reproducing head is as follows. Expression.

L (dB) = 20 × Log ((sin (π
Wtan φ / λ)) / (πWtan φ / λ)) This azimuth inspection film positively utilizes this relationship, and performs magnetic recording by providing a magnetic recording head with an inclination, such as a camera or a magnetic upper reproducing device. And the state of the magnetic head is determined. If the magnetic head is tilted due to a failure in assembling the magnetic head or the like, the difference in tilt between the recording and reproducing magnetic heads increases, and the attenuation of the magnetic signal becomes larger.
_{If it} is less than _L , the magnetically recorded frame is determined to be unrecorded. An azimuth inspection film is used to determine the state of the magnetic head at the frame position determined to be unrecorded. Similar to the output inspection film described above, it is better to judge the state of the magnetic head only from the change in the recorded azimuth.
Since it is easy to narrow down the cause when the reading performance of the magnetic head is poor, it is preferable that the magnitude of the recording signal and the recording density during recording be constant. The magnitude of the recording signal referred to here is the magnitude of an output reproduced when the inclination of the gap of the reproducing head matches the inclination of the recording head. In practice, the inclination of the reproducing head gap is changed in various ways. Is the maximum value of the reproduced signal when it is played. It is also preferable to provide a portion that is not magnetically recorded.

First, the details of the recorded contents of the azimuth inspection film will be described. As described above, the magnetic recording information device of FIG. 2 is used to perform magnetic recording while changing the angle of the magnetic head 49 in the yaw direction for each frame under the rotary stage 52, thereby tilting the azimuth of the recording head. Then, this azimuth inspection film is prepared. Assuming that the angle at which the gap of the magnetic head is perpendicular to the film transport direction is 0 degree and the permissible value of the inclination due to the mounting of the magnetic head of the camera is from -1.0 degree to +1.0 degree, the plus side magnetic field Inspection of head azimuth + Inspection film of azimuth and inspection of azimuth of negative magnetic head-
Two types of azimuth inspection films are prepared. Here, + azimuth inspection films will be described. The recording azimuth is tilted from 0 ° to + 1.0 ° in increments of 0.1 ° per frame on a + azimuth inspection film having 25 frames, and magnetic recording is performed from the first leading frame. That is, the first frame is recorded at a recording azimuth of 0 degree on 25 frames of the azimuth inspection film by the magnetic recording information device,
When the recording head is tilted by rotating the rotary stage by +0.1 degrees for each frame to increase the recording azimuth and perform magnetic recording, the eleventh frame is magnetically recorded with the recording azimuth +1.0 degrees. The remaining 12th to 25th frames are not recorded.

FIG. 7 shows the output waveform of the magnetic signal b reproduced from the + azimuth inspection film produced by the clean magnetic head of the camera with the inclination of the magnetic head being 0 ° as a reference. The dotted line indicates the threshold value _VL of the comparison circuit for determining the presence or absence of a signal. As shown in FIG. 7, if the inclination of the magnetic head is 0 degree, the magnetic signal of the magnetically recorded frame does not fall below the threshold value _VL . Also, if a magnetic recording that can be identified as the azimuth inspection film is recorded at the beginning of the frame of the + azimuth inspection film, the unrecorded frame is detected when the + azimuth inspection film is reproduced by the camera, and the magnetic head is detected. Can be determined and displayed.

FIG. 8 is a flowchart showing the operation of detecting the magnitude of the residual magnetic signal and determining the state of the magnetic head when the azimuth inspection film of the present invention is loaded in the camera of the present invention. Here, the above-mentioned + azimuth inspection film was used.

In step 100, the variable k for setting the position of a frame without a magnetic signal is cleared, and the film is fed to the position before the first frame (0th frame) of the azimuth inspection film.
In step 101, the azimuth inspection film is fed by one frame, and the variable k of the frame position is increased by one. The presence or absence of a magnetic signal of the frame fed in step 102 is detected, and if there is no magnetic signal, the flow is sent to step 104. In step 103, the last frame of the azimuth inspection film is confirmed. If not, the process proceeds to the next frame. In the routine from step 101 to step 103, the azimuth inspection film is fed up to a frame having no magnetic signal. In step 104, the loaded film is checked for the azimuth inspection film based on the magnetically recorded information. Confirmation of the azimuth inspection film is not based on the information magnetically recorded on the azimuth inspection film. good. If it is confirmed that the film is an azimuth inspection film, the flow advances to step 105 to determine the state of the magnetic head from the position of the frame where the magnetic signal is lower than the threshold value _{VL of the} comparison circuit. The determination in step 105 is that when the number of frames below the threshold value _VL is the sixth or less,
Since the recorded azimuth is 0 degrees to +0.5 degrees, that is, the magnetic signal decreases when the azimuth is not relatively inclined,
The cause of the decrease is determined to be contamination of the magnetic head of the camera, and "cleaning" is displayed. When the number of frames below the threshold value _VL is from the seventh frame to the eleventh frame, the azimuth from the first frame to the sixth frame is normally reproduced with a magnetic signal exceeding the threshold _VL when the azimuth is +0.5 degrees or less. Since the azimuth of the 7th frame or more +0.6 or more and the azimuth of the 11th frame +1.0 degree fell below the threshold value _VL , the cause of the decrease in the magnetic signal was determined not to be the contamination of the magnetic head of the camera but to the azimuth deviation of the magnetic head. do it,
"Replace" is displayed to prompt the user to replace the magnetic head of the camera or adjust the azimuth. If the frame whose magnetic signal is lower than the threshold value _VL is the 12th frame, it matches the first unrecorded frame of the azimuth inspection film, and the magnetic head of the camera is judged to be normal and “normal” is displayed. I do. When the motor stops after the 13th frame, the 12th frame where no magnetic signal has been recorded has exceeded the threshold value _VL. Therefore, oscillation may have occurred due to disconnection of the circuit or the like. Encourage an inspection.
In the film for + azimuth inspection of the example, the recording azimuth was changed step by step for each frame. For example, the inspection azimuth was recorded by changing the continuous azimuth by setting one frame to 0 degree of the reference azimuth and 11 frames to +1.0 degree. A film may be used. Also for the azimuth inspection film, if the recording azimuth inclination of the + azimuth inspection film is reversed, the recorded contents and operations are the same, so that the description is omitted. In this embodiment, the recording azimuth of the azimuth inspection film is changed for each frame. However, for example, the recording azimuth is changed for every two frames, and magnetic recording is performed. If the judgment is made, the judgment can be made more accurately. As described above, the state of the magnetic head of the camera can be easily determined using the azimuth inspection film magnetically recorded by changing the recording azimuth of the present invention. In addition, the determination of the state of the magnetic head using the azimuth inspection film is performed not only by the camera but also by a magnetic reproducing head such as an automatic developing processor that prints an image of a photographic film in a lab on photographic paper or a photographic film scanner. With the provided magnetic information reproducing apparatus, it is possible to determine the state of the magnetic head using an azimuth inspection film as in the case of the camera.

FIG. 9 is a conceptual diagram showing an example of a magnetic information reproducing apparatus for performing printing on a photographic paper by using magnetic information of a photographic film after developing a photographic film taken by a camera. The developed photographic film F is transported frame by frame by the transport unit 70 in accordance with an instruction from the controller 150 which has received a signal from the perforation sensor 79 indicating the frame position in the direction D. Information magnetically recorded on the conveyed photographic film F is read by a magnetic head 78, and photographed image information is read by a CCD 75, and the read information is sent to a controller 150. The controller 150 determines an optimal exposure condition for printing on the photographic paper 17 based on the read image information and the magnetic recording information. The controller 150 controls the light source 71 for exposure, the dimming filter 72 for adjusting the color balance of irradiation light, and the shutter 74 for adjusting the exposure time based on the determined exposure conditions to form an image on the photographic film F. The printing paper 17 is exposed through a printing lens 73 to be printed. The photographic paper 17 to which the image of the photographic film F has been exposed is sent to the development processing section 76, and cut into frames after the development processing. The magnetic head 78 of the transport unit 70 is a magnetic head for both magnetic recording and reproduction, and performs magnetic recording and reproduction on the inspection film F via the magnetic information circuit 77 under the control of the controller 150. The circuit operation of the magnetic information circuit 77 is the same as that of the magnetic information circuit of the camera shown in FIG.

Next, the details of the recorded contents of the output inspection film in which the magnitude of the residual magnetic signal is changed for inspecting the magnetic head of the magnetic information reproducing apparatus of the present invention will be described. FIG.
The magnetic information recording apparatus is used to magnetically record the value of the recording current supplied to the magnetic head by lowering it step by step for each frame of the output inspection film F. The first frame of the output inspection film F of 25 frames is recorded at a recording current at which the residual magnetic signal is maximized, and magnetic recording is performed at a recording current at which the residual magnetic signal is reduced by 10% for each additional frame. That is, assuming that the magnitude of the residual magnetic signal of the first frame of the first frame is 100%, the second frame is 90%, the third frame is 80%,.
%, The magnitude of the residual magnetic signal is 10% at the 10th frame, and the magnetic recording is unrecorded from the 11th frame to the 25th frame.

In FIG. 10, the output waveform of the magnetic signal reproduced by the magnetic head of the magnetic information reproducing apparatus is shown by a solid line, with the output inspection film having the inclination of the magnetic head as the reference of 0 degree, and the presence or absence of the magnetic signal. the threshold V _L of the comparator circuit to determine shown by dotted lines. In the output inspection film prepared in this embodiment, the residual magnetic signal is changed for each frame, but the magnetic recording may be performed by changing the residual magnetic signal for every two frames, for example. In the output inspection film, the residual magnetic signal is changed step by step for each frame. For example, a continuous recording current is set so that the magnitude of the residual magnetic signal is 100% for one frame and 10% for the 10th frame. Alternatively, an output inspection film magnetically recorded may be used.

Next, the operation when the output inspection film of the present invention is reproduced by a magnetic information reproducing apparatus provided with a decoding means for decoding magnetically recorded information will be described. Among the information magnetically recorded on an output inspection film having a magnetic recording section, there is a print size when printing on photographic paper. In this method, a print size to be printed on photographic paper is determined in advance when photographing with a camera, magnetic recording is performed as information of a frame of a photographed image, a magnetic signal is reproduced when a magnetic information reproducing device prints a photograph, and photographic paper is reproduced from the obtained information. The print size to be printed is determined. But,
Inexpensive cameras do not have magnetic recording means, and photographic film having all magnetic recording units does not contain print size information. Therefore, when there is no magnetic recording, the magnetic information reproducing apparatus prints the print size of the corresponding frame at a preset size. When printing an image, the ratio of the width to the height of the size is C type of 1: 1.4,
When there are three types: 1: 2.8 P type and 9:16 H type, for example, printing of a frame without a magnetic signal is H
Decide to be a type print and print. C-type print information is magnetically recorded on all the magnetically recorded frames on the output inspection film. When the output inspection film is reproduced by a magnetic information reproducing apparatus and printed by printing, if the magnetic head is tilted to the reference 0 degree and the magnetic reproduction head is clean and normal, the magnetic properties of the output inspection film shown in FIG. From the output waveform of the signal, it is determined that a magnetic signal is present from the first frame to the seventh frame that is equal to or higher than the threshold value _{VL of the} comparison circuit, and printing is performed using the C type, which is magnetically recorded information. Since the magnetic signal is lower than the threshold value _VL, it is determined that the magnetic recording is not performed, and the printing is performed by the H type. That is, it is possible to determine the contamination state of the magnetic head based on the result of printing the output inspection film. For example, if the C-type print is from the first frame to the fifth frame or more and the tenth frame or less, the magnetic head is judged to be clean and displayed as normal because the magnetic signal is less reduced. If it is from the first frame to the fourth frame or less, it is determined that the magnetic signal has decreased due to the contamination of the magnetic head, and a message "cleaning" is displayed to prompt the operator to clean the magnetic head. When the C-type printing was performed on the eleventh frame or more, the magnetic signal exceeded the threshold value _VL on the eleventh frame or more on which no recording was performed. Therefore, oscillation may have occurred due to disconnection of the circuit or the like. Is displayed to prompt the user to check the circuit. Here, the state of the magnetic head is determined based on the print size information of the output inspection film, but the magnitude of the residual magnetic signal for each frame of the output inspection film by the comparison circuit 66, which is the same as the magnetic information circuit of the camera in FIG. May be used to determine the state of the magnetic head. Further, although the print size was used as the magnetic information used to determine the state of the magnetic head, the present invention is not limited to this, and information magnetically recorded on the inspection film, such as the color temperature of the light source, the subject brightness, the exposure time, The state of the magnetic head is determined based on the result of decoding the aperture, backlight, flash emission, continuous shooting, shooting date, photographer's memo, etc., and the decoding result when there is no magnetic information. May be. Furthermore, the inspection film used is not only the output inspection film, but also the status of the magnetic head can be determined from the result of printing the judgment of each frame of the azimuth inspection film and the result of decoding other magnetic information. I can do it. Devices that use the inspection film are not only those that perform the above-mentioned print-in printing, but also do not take pictures of all the frames of the inspection film, for example, a camera that can be taken out halfway and a magnetic device such as an inspection film scanner. A magnetic information reproducing apparatus having a decoding means for decoding recorded information can easily determine the state of the magnetic head using an output inspection film or an azimuth inspection film.

FIG. 11 shows a magnetic information reproducing apparatus for judging the state of a magnetic head using means for measuring the number of magnetically recorded information when an output inspection film is reproduced by a magnetic head of the magnetic information reproducing apparatus. 5 is a flowchart showing an example of the operation of FIG.

The recorded contents of the magnetic information reproducing apparatus and the output inspection film are the same as those shown in FIG. 10, and the number of pieces of information magnetically recorded per frame is set to 100 on the output inspection film. Steps 100 to 105 in the flowchart in FIG. 11 are the same as those in FIG. The output test film and the magnetic head may be momentarily separated from each other due to curl or scratches of the output test film itself, or scum of the processing solution running on the magnetic head, and the magnetic signal may be reduced for a while. In step 106, if the number measured by the counter circuit 67, which is the same as the magnetic information circuit of the camera shown in FIG. 5 among the hundreds of information magnetically recorded on the output inspection film, is 80 or more, the instantaneous magnetic Even if the signal is reduced, it is determined that the information has been read out normally, and the process proceeds to the next step 103. If the number measured by the counter circuit 67 is less than 80, it is determined that there is a magnetic signal. However, it is determined that the magnetically recorded information has not been sufficiently read and the magnetic signal has not been normally reproduced. Returns the variable k at the frame position by one. In step 108, the variable k is determined in the same manner as in the third embodiment. If there is a magnetic signal and the number of pieces of read information is 80 or more, the first to fifth and tenth or less frames are k. If k is 5 to 10, the magnetic head is determined to be normal and 1 If k is 4 or less from the 4th frame or less, it is determined that the magnetic head is dirty. If k is 11 or more, it is determined that there is no information to be read out to the 11th or more unrecorded frames, so it is determined to be abnormal. I do. By measuring the number of pieces of information magnetically recorded in this way, it is possible to determine the magnetic head more accurately than in FIG. Here, the number of recorded information was measured with the output inspection film. However, with the azimuth inspection film, if the presence or absence of a magnetic signal is determined based on the measured value of the number of read information, the magnetic head determination can be performed more accurately. Can be performed. Further, not only a magnetic information reproducing apparatus but also a device equipped with a means for detecting the number of magnetic signals, such as a camera capable of taking out an inspection film in the middle or a scanner of an inspection film, similarly performs magnetic recording. The state of the magnetic head can be easily determined by using the number of information and the inspection film.

[0061]

According to the present invention, it is possible to provide a method capable of quickly, simply and reliably determining the state of the reproduction capability such as contamination of the magnetic head of a magnetic information reproducing apparatus such as a camera or an automatic developing machine, azimuth and other abnormalities. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing one example of an inspection film of the present invention.

FIG. 2 is a conceptual diagram showing a magnetic information recording apparatus for producing an inspection film of the present invention.

FIG. 3 is a block diagram of a recording circuit of the magnetic information recording device of FIG. 2;

FIG. 4 is a conceptual diagram showing an example of the camera of the present invention.

FIG. 5 is a block diagram of a magnetic information circuit of the camera of FIG.

FIG. 6 is a graph showing an example of a waveform of a magnetic information circuit when a photographic film is reloaded into the camera of the present invention.

FIG. 7 is a graph of an output waveform when the azimuth inspection film of the present invention is reproduced.

FIG. 8 detects the magnitude of the residual magnetic signal when the azimuth inspection film of the present invention is loaded into the camera of the present invention,
5 is a flowchart illustrating an operation of determining a state of a magnetic head.

FIG. 9 After developing a photographic film taken by a camera,
FIG. 2 is a conceptual diagram illustrating an example of a magnetic information reproducing apparatus according to the present invention that prints on photographic paper using magnetic information of a photographic film.

FIG. 10 is a graph of an output waveform when the output inspection film of the present invention is reproduced by a magnetic head.

FIG. 11 shows an example of the operation of the magnetic information reproducing apparatus for judging the state of the magnetic head by using means for measuring the number of magnetically recorded information when the output inspection film of the present invention is reproduced by the magnetic head. It is a flowchart shown.

[Explanation of symbols]

 F film (inspection film or photographic film) 1-4 magnetic track 10 perforation 12 shooting frame (frame) 15 cartridge 20 camera body 22 shooting lens 24, 49, 78 magnetic head 25, 41 LED 26, 42, 79 perforation sensor 71 Light source 72 Dimming filter 73 Printing lens 74 Shutter 75 CCD

Claims (21)

[Claims] 1. An inspection film, wherein the magnitude of a residual magnetic signal magnetically recorded on a magnetic recording portion changes in an ascending or descending order in a longitudinal direction. 2. The inspection film according to claim 1, wherein the magnitude of a residual magnetic signal magnetically recorded in the magnetic recording section changes for each frame. 3. The inspection film according to claim 1, wherein the magnitude of the residual magnetic signal magnetically recorded in the magnetic recording section changes continuously. 4. The inspection film according to claim 1, wherein at least a part of the magnetic recording unit is not magnetically recorded. 5. The part where the magnetic recording is not performed,
The inspection film according to claim 4, wherein the film has at least one frame. 6. The inspection film according to claim 1, wherein a recording azimuth of a residual magnetic signal magnetically recorded in the magnetic recording section is constant. 7. The recording medium according to claim 1, wherein a recording density of a residual magnetic signal magnetically recorded in said magnetic recording section is constant.
The inspection film according to any one of claims 1 to 6. 8. The recording azimuth of a residual magnetic signal magnetically recorded on a magnetic recording unit is arranged in ascending or descending order in the longitudinal direction.
Inspection film characterized by changes. 9. The inspection film according to claim 8, wherein a recording azimuth of a residual magnetic signal magnetically recorded in the magnetic recording unit changes for each frame. 10. The inspection film according to claim 9, wherein a recording azimuth of a residual magnetic signal magnetically recorded in the magnetic recording section changes continuously. 11. At least a part of the magnetic recording unit,
The magnetic recording is not performed, The magnetic recording is not performed.
0 The inspection film according to any one of 0. 12. The part where the magnetic recording is not performed,
The inspection film according to claim 11, wherein the inspection film has one or more frames. 13. The apparatus according to claim 8, wherein the magnitude of a residual magnetic signal magnetically recorded in said magnetic recording section is constant.
13. The inspection film according to any one of items 12 to 12. 14. The inspection film according to claim 8, wherein a recording density of a residual magnetic signal magnetically recorded on the magnetic recording unit is constant. 15. An inspection film in which a magnitude or a recording azimuth of a residual magnetic signal magnetically recorded in a magnetic recording unit changes in an ascending or descending order in a longitudinal direction in a magnetic information reproducing apparatus for a photographic film having a magnetic recording unit. A magnetic information reproducing apparatus comprising: an output detecting means for detecting the magnitude of the residual magnetic signal; and a judging means for judging a state of the magnetic head from a detection result by the output detecting means. 16. An inspection film in which a magnitude or a recording azimuth of a residual magnetic signal magnetically recorded in a magnetic recording section changes in an ascending or descending order in a longitudinal direction in a magnetic information reproducing apparatus for a photographic film having a magnetic recording section. A magnetic information reproducing apparatus, comprising: an information number measuring means for measuring the number of information magnetically recorded on the magnetic head; and a judging means for judging a state of the magnetic head from a result of the measurement by the information number measuring means. 17. An inspection film in which a magnitude or a recording azimuth of a residual magnetic signal magnetically recorded in a magnetic recording portion changes in an ascending or descending order in a longitudinal direction in a magnetic information reproducing apparatus for a photographic film having a magnetic recording portion. 1. A magnetic information reproducing apparatus comprising: decoding means for decoding information magnetically recorded on a magnetic head; and judging means for judging a state of a magnetic head from a signal decoded by the decoding means. 18. A test film in which a magnitude or a recording azimuth of a residual magnetic signal magnetically recorded in a magnetic recording portion changes in an ascending or descending order in a longitudinal direction in a magnetic information reproducing apparatus for a photographic film having a magnetic recording portion. A magnetic information reproducing apparatus comprising: a determination unit configured to determine a state of a magnetic head from information on a print size to be printed, which is magnetically recorded on a magnetic disk. 19. A camera for a photographic film having a magnetic recording portion, wherein the magnitude of the residual magnetic signal magnetically recorded on the magnetic recording portion or the recording azimuth changes in ascending or descending order in the longitudinal direction. A camera comprising: output detection means for detecting a magnitude of a residual magnetic signal; and determination means for determining a state of a magnetic head from a detection result by the output detection means. 20. A photographic film camera having a magnetic recording portion, wherein the magnitude of the residual magnetic signal magnetically recorded on the magnetic recording portion or the recording azimuth is changed in ascending or descending order in the longitudinal direction. A camera comprising: an information number measurement unit for measuring the number of pieces of information obtained; and a determination unit for determining a state of the magnetic head from the information number measured by the information number measurement unit. 21. A camera for a photographic film having a magnetic recording portion, wherein the magnitude or recording azimuth of a residual magnetic signal magnetically recorded in the magnetic recording portion changes in ascending or descending order in the longitudinal direction. A camera comprising: a determination unit configured to determine a state of a magnetic head from position information of a part that has not been subjected to the operation.