JPH0720558A - Camera - Google Patents

Abstract

PURPOSE:To improve reliability in data-recording without using a special recording/reproducing sequence by actuating a means for discriminating whether or not information is accurately reproduced at rewinding. CONSTITUTION:This camera using a film provided with a magnetic storage part is provided with the means 50 for discriminating whether or not the information is accurately reproduced through a magnetic head 8, and then, the data magnetically recorded at a take-up time is checked at the rewinding time. That is, when the film starts to be rewound, the recorded magnetic signal is reproduced and a clock signal is detected. Then, whether or not magnetic recording is accurately executed is checked by detecting the presence or absence of the error of the clock signal. In the case that writing on the clock signal side is not normally executed, the clock signal is not detected at even time intervals beyond the extent of a time interval under giving consideration to the speed variation of a film, so that it is judged as the error, and then, warning is issued by a display circuit 65.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a film with a magnetic storage unit, and more particularly to a camera capable of both recording and reproduction.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 4-128831 proposes a camera which reproduces a recording signal recorded on a film with a magnetic storage unit once and gives a warning when the erroneous reading rate is above a predetermined level.

Further, Japanese Patent Laid-Open No. 3-140935 proposes a camera that records / reproduces dummy data (or data at the time of photographing) and compares them with each other.

[0004]

However, in the former conventional example, it is premised that the signal recorded in advance (pre-recorded) on the film is reproduced, not the signal recorded by the camera itself being used. It is said that.

The latter conventional example has a special sequence for recording / reproducing.

Further, in Japanese Patent Laid-Open No. 3-228267, data is output in the reading order when reading in the designated direction.
Also, a reading retry method has been proposed in which data is output in reverse order when reading in the direction opposite to the pointing direction, but this is one in which the direction is sequentially reversed and rereading is performed until normal reading is possible. , Whether there is an error at that time,
It is recognized when it is in the same direction as reading.

The present invention has been made to solve the above problems, and an object thereof is to provide a camera capable of improving the reliability of data recording without using a special sequence for recording / reproducing. And

[0008]

In order to achieve the above object, a camera using a film with a magnetic memory portion according to the present invention is a camera according to claim 1, wherein the film is wound and wound. Information is recorded by a film feeding means for returning, a magnetic head for recording and reproducing information to and from a magnetic storage unit provided in the film during film feeding of the film feeding means, and the magnetic head. And a discriminating means for discriminating whether or not the disc is correctly reproduced, and the discriminating means is operated during rewinding. Further, in the second and third aspects, the discriminating means stores information at the time of writing. Whether the comparison is made or not is determined by the determination means for detecting the presence / absence of a signal at a constant time interval. Furthermore, in claim 4, the information is not correctly transmitted by the determination means. If it is determined are those issues a warning, and when the information that has not been performed correctly discriminated by the discrimination means according to claim 5 performs the writing again.

[0009]

According to the present invention, the discriminating means is operated during rewinding so that the data magnetically recorded at the time of winding can be checked at the time of rewinding.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a rear view showing a camera with a back cover removed.

In FIG. 1, 1 is a camera body, 2 is a cartridge chamber, 3 is a fork, 4 is a spool chamber, and 5 is a film take-up spool. Reference numeral 6 is an aperture of the camera, and the film is exposed in this portion. 7
As shown in FIG. 1, is a photoreflector which is arranged at the upper left when seen from the rear of the camera, that is, between the photographing frame and the next frame, and detects the perforation of the film.

Reference numeral 8 is a magnetic head which is pressed against the magnetic layer of the film to record information.

FIG. 2 is a block diagram showing a circuit configuration of a camera according to an embodiment of the present invention. 50 is a control circuit for controlling various circuits of the camera, 51 is a battery as a power source, and 52 is a release button. Metering / distance measurement start switch that turns on at the first stroke, and 53 is the second release button
A release switch that is turned on by a stroke, 54 is a photometry circuit that measures the subject brightness, 55 is a distance measurement circuit that measures the distance to the subject, and 56 is the focus of a photographing lens (not shown) based on information from the distance measurement circuit 55. AF for adjustment
A drive circuit, 57 is a shutter control circuit that controls opening and closing of the shutter, 58 is a motor drive circuit that drives a film feeding motor 59, 60 is a RAM, and 61 is a timer.

Reference numeral 62 is a magnetic recording / reproducing circuit for writing / reading information to / from the film, and 64 is a film number reading unit for reading the number of recorded films by the bar code 63 on the film cartridge.

Reference numeral 65 denotes a shutter speed (TV) and an aperture value (A
V), a magnetic recording circuit error display, and the like.

FIG. 3 shows waveforms during magnetic recording.

FIG. 3A shows a normal write / read state. The lower waveform is the clock, the upper waveform is the data, and the data is relative to the clock time interval. If it is in the first half, it is "0", and if it is in the latter half, it is "1". This method is disclosed in, for example, US Pat.
This is a known method as described in U.S. Pat. No. 20,927 and U.S. Pat. No. 4,876,697.

In FIG. 3B, the signal on the clock side has not reached the specified level.

In FIG. 1C, the signal is added to the signal on the clock side due to the influence of noise or the like.

In the same figure (D), the signal on the data side has not reached the specified level.

FIG. 3E shows a waveform in which the signal on the data side has a signal due to the influence of noise or the like.
Neither can read normally.

FIG. 4 is a flow chart showing an operation after the film cartridge is loaded into the cartridge chamber 2 of the camera and the auto loading is completed in the embodiment of the present invention.

In the flow charts of FIG. 4 and subsequent figures, step is abbreviated as S.

It is determined whether or not the switch 52 (SW1) is turned on by pressing the first stroke of the release button (S101). If it is ON, the process proceeds to S102 and OF
If F, this S101 is repeated. If SW1 is ON, the photometric circuit 54 and the distance measuring circuit 55 are driven to obtain respective information (S102).

Next, it is determined whether or not the second stroke of the release button is pushed and the switch 53 (SW2) is turned on (S103). If it is ON, the process proceeds to S104, and if it is OFF, the process returns to S101. If SW2 is ON, AF is performed based on the information obtained by the distance measuring circuit.
Focus adjustment of a photographing lens (not shown) is performed via a drive circuit 56, and then the photometry circuit 54 operates a shutter control circuit 57 based on the obtained information to perform a shutter opening / closing operation, that is, an exposure operation.

After that, in S105, the drive of the motor 59 and the drive of the photo reflector 7 are started through the motor drive circuit 58, and one frame is wound.
At that time, in S106, information recording is performed by the magnetic recording / reproducing circuit 62 and the magnetic head 8. At this time, the recorded data is stored in the storage area of the corresponding frame in the storage area for one film in the RAM 60.

Next, perforation is detected (S
107), when perforation is detected, the winding of one frame is ended (S108). Then, it is determined whether or not it is the last frame (S109), and if it is not the last frame, S1
Return to 01. If it is the last frame, the process proceeds to S110 and thereafter. Whether or not it is the final frame can be obtained by knowing the maximum number of films in the film number reading unit 64 and comparing the frame count values.

Next, moving to FIG. 5, rewinding is started (S1
10) In S111, the magnetic signal recorded in S106 is reproduced. Then, the clock signal is detected (S112), and the presence or absence of an error in the clock signal is detected in S113 to check whether or not the magnetic recording is accurately performed. If the writing on the clock signal side is not performed normally, the clock signal exceeds the range of the time interval considering the film speed fluctuation and cannot be detected at equal time intervals, so it is judged as an error at that time. The display circuit 65 gives a warning (S11
4). This is executed until the film is rolled up (S
115). When the film is wound, the rewinding of the film is stopped (S116), the film cartridge is taken out (S117), and a series of sequences is completed.

FIG. 6 shows another embodiment after the start of rewinding.

In S210, rewinding is started, and S211 is started.
At, the magnetic signal recorded in S106 is reproduced. Then, by comparing the reproduction signal with the data recorded at the time of writing, that is, the data stored in the RAM 60 (S212), it is checked whether or not the magnetic recording is accurately performed (S213). At this time, since the feeding direction is different between writing and reading, data comparison is performed from the reverse of writing data, and according to the recording method as shown in FIG. Since "" and "1" are inverted, comparison with the inverted data is performed. If the writing is not performed normally, the comparisons do not match, and at that time, it is determined that there is an error and a warning is issued by the display circuit 65 (S2).
14).

This process is repeated until the film is rolled up. When the film is wound (S215), the rewinding is stopped (S216), the film cartridge is taken out (S217), and a series of sequences is completed.

FIG. 7 shows still another embodiment after the start of rewinding.

In S310, rewinding is started, and S311
At, the magnetic signal recorded in S106 is reproduced. Then, by comparing the data recorded at the time of writing in S312 and S313, that is, the data stored in the RAM 60, it is checked whether or not the magnetic recording is accurately performed. If the writing is not performed normally, the comparison does not match, so that it is judged as an error at that time, the rewinding is stopped (S314), and the feeding in the winding direction is started (S315). Then, information recording is performed again by the magnetic recording / reproducing circuit 62 and the magnetic head 8 (S316), and if perforation is detected in S317, winding is ended in S318.

Then, in S319, rewinding is started again.

This is repeated until the film is wound (S320). When the film is wound, the rewinding is stopped (S321), and when the film cartridge is taken out in S322, a series of sequences is completed.

[0036]

As described above, according to the present invention, the data recorded at the time of film winding is checked at the time of rewinding, so that the reliability of data recording is improved while effectively utilizing the rewinding time. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a rear view showing a camera according to an embodiment of the present invention with a back cover removed.

FIG. 2 is a block diagram showing a schematic configuration of the camera of FIG.

FIG. 3 is a diagram showing waveforms by a magnetic recording / reproducing circuit 62.

FIG. 4 is a flowchart showing a shooting operation according to an embodiment of the present invention.

FIG. 5 is a flowchart showing an operation after rewinding in the embodiment of the present invention.

FIG. 6 is a flowchart showing an operation after rewinding in another embodiment of the present invention.

FIG. 7 is a flowchart showing an operation after rewinding in another embodiment of the present invention.

[Explanation of symbols]

 7 Photo Reflector 8 Magnetic Head 58 Motor Drive Circuit 62 Magnetic Recording / Reproducing Circuit 65 Display Circuit

Claims (5)

[Claims] 1. In a camera using a film with a magnetic storage unit, a film feeding unit for winding and rewinding a film, and a magnetic storage unit provided in the film during film feeding by the film feeding unit. A magnetic head for recording and reproducing information, and the magnetic head,
A camera characterized by having a discriminating means for discriminating whether or not information is reproduced correctly, and operating this discriminating means during rewinding. 2. The camera according to claim 1, wherein the discriminating means compares the information at the time of writing. 3. The camera according to claim 1, wherein the discriminating means detects the presence / absence of a fixed time interval signal. 4. The camera according to claim 2 or 3, wherein a warning is given when the determination means determines that the information is not correctly performed. 5. The camera according to claim 2, wherein when the discriminating means discriminates that the information is not correctly recorded, the writing is performed again.