JPH04365024A - Camera using film with magnetic memory section - Google Patents

Abstract

PURPOSE:To prevent the wasteful extraction of a film when the record information on a photographed frame can not be regenerated by regenerating the record information after winding the film while in use. CONSTITUTION:In a camera capable of being mounted with a film sealed in a film cartridge with a film use state display means and having a magnetic record section in which the magnetic record information can be read by a magnetic head, an in-use judging means judging whether a film is in use or unused in step S1, a winding means winding the film to the first frame in step S5 when the judging means judges that the film is in use, a data introducing means judging the presence of the reading of the record information in the film winding process by the winding means, and an abnormality processing means rewinding the film and prohibiting photographing in response to the readout state of the record information by the data introducing means are provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera loaded with film and equipped with a magnetic recording section in which film information, photographic information, etc. are recorded.

0002

2. Description of the Related Art A camera has been developed in which information about a film is recorded as magnetic information on a member that moves integrally with the feeding of the film, and this magnetic information is read in conjunction with the feeding of the film. 22799. Further, US Pat. No. 4,878,075 proposes a method in which film information is rewritten to become exposed information. Further, US Pat. No. 4,965,600 proposes a cartridge that displays whether it is unused, in use, or used. In addition, US Pat. No. 4,864,332 proposes a technique for reproducing and recording film information and camera shooting information by providing a magnetic recording section on a film. In addition, cameras that use such films can detect exposure information by comparing it with the cartridge display (hereinafter referred to as the VEI display) and the basic type of magnetic information, even after the film is rewound during use. Then, it is possible to load the camera again, set the unexposed part, and take a picture.

0003

[Problem to be Solved by the Invention] However, in the above conventional example, if the camera's magnetic reproducing circuit is defective, even though it is useless to feed the frames, the camera is photographed while feeding all the frames. It searches for magnetic information indicating that it has been completed. For this reason, there is a problem in that the film is easily scratched inside the camera. SUMMARY OF THE INVENTION An object of the present invention is to provide a camera that uses a film equipped with a magnetic recording section that prevents the feeding of all frames if the camera's magnetic reproducing circuit is defective, thereby making the film less susceptible to scratches.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention has a magnetic recording section that is enclosed in a film cartridge that is equipped with a film usage status display means and that allows recorded information to be read by a magnetic head. In a camera capable of loading film, an in-use determining means for determining that the film is in the middle of being used, a winding means for winding the film to the first frame, and reading of the recorded information during the film winding process by the means. and abnormality processing means for rewinding the film and prohibiting photography depending on the reading status of the recorded information by the means.

[0005]

[Operation] According to the above-mentioned means, by determining the film usage status display means of the film cartridge, it is determined whether the film cartridge is unused or in the middle of use, and when it is determined that the film is in the middle of use, the film is in the process of being wound up to the first frame. Recorded information is taken in, and it is determined whether or not the magnetically recorded information can be reproduced. If not, the film is rewound and photography is prohibited. Therefore, even if the recorded information cannot be reproduced, the film is not unnecessarily drawn out from the cartridge, and it is possible to reduce flaws on the film. In addition, the film can be taken out from the camera immediately, so there is no chance of missing a photo opportunity.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flow chart showing the main processing of a camera according to the present invention. The process that follows is shown in Figures 4 to 7.
This is a flowchart. Further, FIG. 2 is an exploded perspective view showing a schematic configuration of a mechanical part of a camera according to the present invention, and further, FIG. 3 is a block diagram showing an entire circuit of an electrical system of a camera according to the present invention. First, the mechanism and electrical system of the camera will be explained with reference to FIGS. 2 and 3. In FIG. 2, 1 indicates perforations P1 and P2 of film F.
2 is a film feeding motor placed in the spool, 3 is a gear mechanism that decelerates and switches between winding and rewinding, and 4 is a winding motor. fork for return,
5 is a magnetic head for writing and reading information on the track T on the film F, and 6 is a pressure pad for pressing the film F against the magnetic head 5. A film F is stored in the film cartridge C in a wound state. Film F has a magnetic layer coated on its base side, and one side edge of film F has a track T on which data such as exposure conditions and frame numbers are recorded as magnetic information.
The other side edge is provided with perforations P1 and P2 corresponding to the photographing screen. Further, on the upper surface of the film cartridge C, there is provided a mark E for indicating the film usage status on the end face of the film spool SP, which indicates the usage status of the film relative to the film cartridge C. Further, a photo reflector 19 is disposed on the top of the film cartridge C in order to detect this mark E for indicating film usage status.

Next, the configuration of FIG. 3 will be explained. Reference numeral 8 denotes a CPU that controls the driving of the entire system, and power is supplied from the battery 7. In addition to the battery 7, the CPU 8 includes a release switch 9 that is turned on when starting a photographing operation, a feeding circuit 10 that winds and rewinds the film F, and a signal detected by the photo reflector 1 for feeding. Pulse detection circuit 1 that makes the signal acceptable
1. Magnetic information writing circuit 12 that transmits a signal for recording photographic information to track T of film F by magnetic head 5; Magnetic reproducing circuit 13 that reads magnetic information written on track T of film F; automatic exposure; , automatic focusing, and AE/AF for shutter opening/closing operations
/SH circuit 14, LCD (liquid crystal display) 15 that displays the frame number of film F and issues an abnormality warning.
, LEDs (light emitting diodes) 16 and 17 that provide a lighting display to warn of an abnormality, and a buzzer 18 that provides an audible warning of an abnormality. Further, a detection circuit 20 is connected to the CPU 8, and a photoreflector 19 is connected to this detection circuit 20.

Next, an example of processing for achieving the present invention will be explained with reference to the flowchart shown in FIG. In addition, in the figure, S means a step. First, as shown in Fig. 1, the film usage status display E is detected (VEI check) (S1), and if unused is detected, S
2 winds up to the first frame (S2), sets it at the first frame position (S3), and then proceeds to the process shown in FIG. On the other hand, if it is detected that the film is in the middle of being used, the film usage status (S1) detected by the photoreflector 19 and the detection circuit 20 is stored in a storage area within the CPU 8 (S4). After further winding the film (S5),
The magnetic information is taken into the CPU 8 (S6). Next, it is checked whether it is in the first frame (S7), and if the first frame is confirmed, it is checked whether the magnetic information (Mg data) captured in step S6 can be read as data (S8), If it cannot be read, "Abnormal handling 2" (
Execute S14), and if it can be read, perform an exposure check (
S9). If it is unexposed in the initial state, the flow shifts to D in FIG. In the exposure check, the exposure state is determined based on whether the magnetic information remains in the initial state of the film. If it is not in the initial state, it is considered that the exposure has been completed, and the magnetic information from the second frame onward is imported into the CPU 8 (S10).
Check whether the frame is within the shooting range (S11),
Determine whether the frame is exposed or not based on the exposure data (
S13). If there is an unexposed frame within the photographable range frame, the process moves to the flow E in FIG. 4. If there is no unexposed frame within the photographable range frame, it is assumed that there is a problem with the film cartridge C or the film, and "abnormality processing 1" is executed (S12). This process is performed even though the film usage status display mark E is in the middle of being used, all frames of magnetic information have been exposed and the normal operation of the magnetic circuit has been confirmed in step S8. This is to be treated as a problem for Film F. Note that if the data cannot be read in the magnetic information check in step S8, there is a possibility that the magnetic circuit has failed, so "abnormality processing 2" is performed as a problem with the magnetic field (S14), and then the film presence/absence switch (not shown) is ) is detected (S15),
When the film F is loaded, the flow shifts to step S1 A in FIG.

Next, the process shown in FIG. 4 following the flow shown in FIG. 1 will be explained. First, in order to check whether there are any exposed frames after the second frame, the magnetic information is sent to the CPU.
8 (S16), it is confirmed whether the frame is within the photographable range (S17), and it is determined whether the frame is unexposed based on the exposure data (S18). If there is an exposure frame within the photographable range frame, the frame number at which the exposure section starts is stored (S19) and used as duplicate photography prevention data. Then, the film is rewound to the first frame (S20
), a photographable frame is set (S21), and the process further proceeds to the flow of B in FIG. On the other hand, in step S17
>Max frame is determined, the magnetic information is unexposed in all frames even though the film usage status display mark E is in the middle of being used, and unexposed information is detected. Therefore, since it is confirmed that the initial state of magnetic information is normally detected by the magnetic circuit, "abnormality processing 1" shown in FIG. 6, which will be described later, is performed as a problem with cartridge C or film F (S22). The process moves to the flow of step S15 C in FIG. On the other hand, in the flow shown in E of FIG. 4, first, the frame number at which non-exposure begins is stored (S23), and this is used as data to prevent duplicate photography. Next, in order to check whether there are any frames that have been exposed again after the frame stored in step S23, the magnetic information is imported into the CPU 8 (S24), and it is checked whether the frame is within the photographable range. , it is determined whether the frame is an unexposed frame based on the exposure data (S25). If there is an exposed frame within the photographable range frame, the exposure is checked (S26).
Furthermore, the frame number at which the exposure section starts is stored again (S27), and is used as data to prevent duplicate photography. Further, if it is determined in step S25 that there is no exposed frame within the photographable range frame, the film is rewound to the first unexposed frame stored in step S23 (S2
8), sets the frame that can be photographed (S29), and moves to the flow of B in FIG.

Next, the process shown in FIG. 5 will be explained. First, ON/OFF of the release switch 9 is detected (S30
), if ON, AE processing (S31), AF processing (S3
2) and SH processing (S33) are performed sequentially to perform well-known photometry,
Measures distance and performs shooting operation. Next, the feeding motor 2 is rotated to start winding the film F (
S34). Further, data at the time of photographing is recorded on the track T by the magnetic head 5 and the magnetic information writing circuit 12 (S35). And perforations P1, P
2 is detected by the photoreflector 1 as a signal for one frame, the feeding motor 2 is stopped (S3
6) Complete the winding. After this, step S19
Alternatively, it is determined whether the frame has been exposed as stored in step S27 (S37), and if it has been exposed, it is rewound (S39), and if it has not been exposed, it is determined whether the film F has reached the final frame. is detected by a final frame detection perforation (not shown). If the final frame has not been completed, the process moves to step S30, and if the final frame has been completed, the film F is rewound (S39). At the end of this rewinding, the film usage status display mark E is moved to the "used" position (S40). Next, removal of the film is detected by a film presence/absence switch (not shown) (S41), and if the film has been removed, the process moves to step S15 and subsequent steps in FIG.

FIGS. 6 and 7 are flowcharts showing details of "abnormality processing 1" and "abnormality processing 2" shown in FIGS. 1 and 4. First, "abnormality processing 1" will be explained. First, rewind the film (S) so that no pictures are taken.
42), then the photographing is prohibited so that the operation output of the switch 9 is not received (S43). Furthermore, after displaying on the LCD (for example, "FE") indicating a film error (S44), the LED 16 is made to blink (S45).
. Next, the mark E for displaying the film usage status is moved to "Used" (S46), and removal of the film is detected based on the operation of the film presence/absence switch (S47), and if the film is removed, the shooting prohibition executed in step S43 is executed. The state is canceled (S48). Next, “Abnormal processing 2” shown in FIG.
” will be explained. First, as in the case of "abnormality processing 1", the film F is rewound (S49) and photography is prohibited (S50). Next, an LCD display (for example, "ME") indicating a magnetic circuit error is displayed (S51).
Further, after blinking the LED 17 (S52), the buzzer 18 generates a warning sound (S53). Next, set the film usage status display mark E to "In use" (S5
4) If it is detected that the drive battery 7 has been removed, a reset is performed (S55).

FIG. 8 is a perspective view showing another example of film usage status display. Reference numeral 21 denotes film usage status display means. With this film usage state display means 21, the black part moves in the circumferential direction according to the usage amount of the film F, and it is possible to individually display unused, partially used, and used according to the position of the black part.

[0013]

As explained above, the present invention provides a camera that can be loaded with a film that is enclosed in a film cartridge that is equipped with a film usage status display means and that has a magnetic recording section that allows recorded information to be read by a magnetic head. , an in-use determining means for determining that the film is in the middle of being used, a winding means for winding the film to the first frame when the means determines that the film is in the middle of use, and the recording in the process of winding the film by the means. A data importing means for determining whether information is being read or not, and an abnormality processing means for rewinding the film and prohibiting photography depending on the reading status of the recorded information by the means are provided, so that it is possible to prevent recorded information from being readable. No need to unnecessarily pull out the film from the cartridge, even if
Film flaws can be reduced. In addition, the film can be taken out from the camera immediately, so there is no chance of missing a photo opportunity.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing main processing in the present invention.

FIG. 2 is an exploded perspective view showing a schematic configuration of a mechanism section of the camera according to the present invention.

FIG. 3 is a block diagram showing the overall circuit of the electrical system of the camera according to the present invention.

FIG. 4 is a flowchart showing processing subsequent to flows D and E in FIG. 1;

FIG. 5 is a flowchart showing processing subsequent to flow B in FIGS. 1 and 4;

FIG. 6 is a flowchart showing details of "abnormality processing 1" shown in FIGS. 1 and 4;

FIG. 7 is a flowchart showing details of "abnormality processing 2" shown in FIG. 1;

FIG. 8 is a perspective view showing another example of film usage status display.

[Explanation of symbols]

1 Feeding photoreflector 2 Film feeding motor 3 Gear mechanism 4 Fork 5 Magnetic head 6 Crimping pad 7 Battery 8 CPU 9 Release switch 10 Feeding circuit 11 Pulse detection circuit 12 Magnetic information writing circuit 13 Magnetic reproducing circuit 14 AE/ AF/SH circuit 15 LCD 16, 17 LED 18 Buzzer 19 Photo reflector 20 Detection circuit 21 Usage status display means C, C' Film cartridge E Film usage status display mark F Film SP Film spool T Track

Claims (1)

[Claims] 1. In a camera that can be loaded with a film that is enclosed in a film cartridge that is equipped with a film usage state display means and that has a magnetic recording section from which recorded information can be read by a magnetic head, the film is in the middle of being used. a winding means for winding the film up to the first frame; a data importing means for determining whether or not the recorded information is read by the means during the film winding process; A camera using a film equipped with a magnetic recording section, characterized in that the camera is equipped with an abnormality processing means that rewinds the film and prohibits photography depending on the reading situation.