JPH10115862A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera constituted so that magnetic information can be stably read without being erroneously read in the midst of reading even when external magnetic noise being changed and the like is caused. SOLUTION: The camera 1 is provided with a cartridge chamber 1a housing a cartridge 2 and a spool chamber 1b housing a spool 3 winding up a film F. A motor 4 is arranged in the spool 3 so as to execute the winding-up action of the film F by the spool 3 and the feeding-out and the rewinding actions of the film F by a fork 5. A photoreflector 6 detecting whether the film F exists in the camera 1 or not, a magnetic head 7 reading or writing the magnetic information, a magnetic sensor 8 detecting the external magnetic noise exerting an influence on the camera 1, a warning means 10 warning abnormality and a microcomputer 11 controlling them are arranged in the camera 1. Then, the microcomputer 11 and the respective elements are electrically connected. Besides, magnetic shielding measures are taken with respect to the motor 4 so that the magnetic noise generated in the midst of driving does not exert the bad influence on the head 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to magnetic information reading means of a camera using a magnetically writable film. More specifically, the present invention relates to a method for reducing reading errors when reading magnetic information.

[0002]

2. Description of the Related Art Conventionally, many devices have been devised for a camera capable of writing magnetic information using a film cartridge containing a leader portion, a film feeding mechanism, and the like. As the information to be recorded, in addition to recording the photographing condition, exposure condition, screen size, and the like for each photographed frame, the number of photographed frames out of all photographed frames of the film may be recorded. As a result, it is possible to rewind and take out the film being photographed once, reload it, wind it up to a photographable frame, and resume photographing. In that case, the camera
A function of reading magnetic information during winding or rewinding other than recording is required.

When reading magnetic information recorded on a film, a problem is a reading error of the magnetic information. This is because the magnetic noise of the hoist motor in the camera and the various external magnetic noises near the camera affect the read head when performing the magnetic reading while winding. The following proposals have been made to solve the problem.

That is, as disclosed in Japanese Patent Application Laid-Open No. 4-26832 by the same applicant as the present application, a magnetic shield plate is wound around a feeding motor so that magnetic noise does not reach the read head.

Further, Japanese Patent Application Laid-Open No.
As in Japanese Patent No. 32086, a flexible printed circuit board constituting a read head is surrounded by a magnetic shield plate to block magnetic noise.

Further, Japanese Patent Application Laid-Open No.
Prior to reading magnetic information, if the external magnetic noise detected by the read head is equal to or higher than a predetermined level, the winding operation and the reading operation are not performed.

[0007]

However, the following problems remain in the above-mentioned prior art.

By providing a magnetic shield to the motor, the magnetic noise of the motor can be cut off, but there is no effect on the external magnetic noise from outside the camera.

When a shield plate is wound around a flexible printed circuit board, a head, or the like, a sufficient shielding effect is obtained with respect to external noise of unknown size as compared with a feed motor having a known noise level. For this reason, the entire reading circuit must be provided with an unnecessarily large shield plate, which makes the camera unnecessarily large.

Since the read head itself is the external magnetic noise detecting means, even if the external magnetic noise is checked immediately before reading, the check cannot be performed during reading. A large change in noise leads to a reading error.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a camera having a structure capable of stably reading magnetic information without causing a reading error during reading even for changing external magnetic noise and the like. And

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a reading means capable of reading magnetic information recorded on a film; Means, an electromagnetic wave detecting means, and a control means, while reading magnetic information in association with film winding, when the electromagnetic wave detecting means detects extraneous magnetic noise of a predetermined level or more, winding is performed simultaneously with the reading operation. A control sequence for temporarily stopping the operation is provided in the control means to prevent a reading error.

Further, according to the present invention, there is provided a camera comprising a reading means capable of reading magnetic information recorded on a film, a film winding and rewinding means, an electromagnetic wave detecting means, and a control means. If the electromagnetic wave detection means detects extraneous magnetic noise of a predetermined level or more while reading magnetic information in association with film winding, the control means includes a control sequence for temporarily stopping the winding operation at the same time as the reading operation. During the suspension of the magnetic reading operation and the winding operation, a warning means for displaying a warning is provided, and by displaying the abnormality to the user, it is possible for the user to appropriately respond to the magnetic noise that cannot be ignored. Be prepared to respond.

According to a third aspect of the present invention, there is provided a camera comprising a reading means capable of reading magnetic information recorded on a film, a film winding and rewinding means, an electromagnetic wave detecting means, and a control means. If the electromagnetic wave detecting means detects extraneous magnetic noise of a predetermined level or more while reading magnetic information in association with film winding, the control means includes a control sequence for temporarily stopping the winding operation simultaneously with the reading operation. During the suspension of the magnetic reading operation and the winding operation, the control unit has a control sequence for restarting the reading operation and the winding operation when the external magnetic noise detected by the electromagnetic wave detection unit falls below a predetermined level. This prevents the user from performing complicated operations.

Further, according to a fourth aspect of the present invention, there is provided a camera comprising a reading means capable of reading magnetic information recorded on a film, a film winding and rewinding means, an electromagnetic wave detecting means, and a control means. If the electromagnetic wave detection means detects extraneous magnetic noise of a predetermined level or more while reading magnetic information in association with film winding, the control means includes a control sequence for temporarily stopping the winding operation at the same time as the reading operation. A control sequence for restarting the reading operation and the winding operation when the external magnetic noise detected by the electromagnetic wave detection unit falls below a predetermined level while the magnetic reading operation and the winding operation are temporarily stopped; In the sequence,
By providing the control means with a control sequence for completely rewinding the film into the cartridge containing the film prior to resuming the reading operation and the winding operation, the magnetic information can be accurately read.

Further, according to a fifth aspect of the present invention, there is provided a control device having a sequence for completely stopping the magnetic reading operation and forcibly rewinding the magnetic reading operation and the winding operation while the magnetic reading operation and the winding operation are temporarily stopped. With the provision of the operation means, loading halfway can be forcibly terminated, so that the user can appropriately cope with extraneous magnetic noise that cannot be ignored.

[0017]

FIG. 1 is a schematic diagram showing the configuration of the present invention. FIGS. 2 and 3 show flowcharts necessary for the operation performed in the configuration of FIG.

FIG. 1 shows only the structure necessary for the present invention, and the exposure means, finder mechanism and the like conventionally provided in a camera are omitted. The camera 1 has a cartridge chamber 1a for storing a cartridge 2 and a spool chamber 1b for storing a spool 3 for winding up a film F. A motor 4 is provided in the spool 3, and performs a winding operation (arrow A) of the spool 3 and a feeding and rewinding operation (broken line B) in the film F by the fork 5. Here, a broken line indicates a conventional gear transmission mechanism or the like, but has no direct relation to the present invention, and thus a description thereof is omitted.

Further, the camera 1 of the film F is installed in the camera 1.
A photoreflector 6 for detecting the presence / absence of the inside and detecting the perforation (not shown) of the film; a magnetic head 7 for reading or writing magnetic information;
A magnetic sensor 8 for detecting extraneous magnetic noise exerted on the camera 1, a switch 9 described later, a warning unit 10 for warning an abnormality
(Sound, display, etc.), and a microcomputer 11 for controlling them are also arranged. The microcomputer 11 and each element are connected by a thick line in the figure. The motor 4 is provided with magnetic shielding measures by various known techniques so that magnetic noise generated during driving does not adversely affect the magnetic head 7.

The operation of reading magnetic information of a photographable frame after reloading the cartridge 2 in the middle of photography into the camera 1 with the above configuration will be described with reference to the flowcharts of FIGS.

First, the detection and determination of whether a photograph is being taken, is completely unexposed, or has been completely exposed, and the control of winding up to a photographable frame is performed by various known techniques, and will not be described in the present invention. Here, it is assumed that the cartridge 2 in the middle of photographing is loaded, and the operation after the microcomputer 11 detects this is shown. In the following main flowchart (FIG. 2) and rewind flowchart (FIG. 3), each step is abbreviated as S.

In FIG. 2, the motor 4 is driven and the fork 5 is rotated to feed the film F from the cartridge 2 and wind it around the spool 3 (S1).

Next, the magnetic head 7 starts reading information to read magnetic information (the number of photographed frames) recorded in the film leader portion and each photographed frame (S).
2).

Thereafter, it is determined whether or not the number of frames has been read (S3). If the reading is completed, the process proceeds to S4, and if not, the process proceeds to S6.

In step S4, since the necessary magnetic information has been read, the reading of the magnetic head 7 ends. Then, the winding necessary for magnetic reading is completed (S5). Actually, the original film winding operation (S16) follows thereafter.

In S6, the external magnetic noise coming to the camera 1 during the magnetic reading is detected by the magnetic sensor 8,
It is determined whether or not the magnetic head 7 is at a level that causes a reading error. At this time, if the noise level is low, the process returns to S3 and the reading is continued. If the noise is large, the process proceeds to S7. By this S6, a noise check can be always performed even when the magnetic head 7 is operating in reading magnetic information. This is a difference from the related art, and is also an effect of the invention.

As a result of the processing in S6, when the microcomputer 11 determines that there is a risk of occurrence of a reading error, the reading is stopped (S7). Then, the motor 4 is stopped (S8).

Then, in order to distinguish the stop from the motor 4 due to the normal operation, a warning is displayed by a warning or sound by the warning means 10 (S9).

In S10, it is determined whether or not the switch 9 has been pressed. The switch 9 is an external operation switch that can be operated by the user of the camera 1, and is pressed to stop the automatic winding up to the photographable frame when an abnormality is confirmed by the warning unit 10. This is pressed when the user cannot move from the noise source or when the source of the external magnetic noise is unknown and the loading of the cartridge 2 is interrupted for the time being. If the switch 9 is pressed, the process proceeds to S14. If the switch 9 is not pressed, the process proceeds to S11. In S11, S6
Similarly, the noise level is determined by the magnetic sensor 8. If higher, return to S10 and repeat the loop; if lower, S12
Proceed to. The reason why the high extraneous noise determined in S6 becomes low may be a case where the user who has confirmed the abnormality by the warning unit 10 moves the camera 1 to resume reading and moves away from the noise source.

In S12, since the external noise has become low, the warning display is terminated.

Next, the film F is rewound to restart magnetic reading (S13). For now, S1,
Although the magnetic information is read halfway in the stage 2, even if the winding and reading are resumed from the middle of the stop, there is a possibility that a reading error may occur due to unstable factors such as the film feeding speed. Therefore, when restarting, it is more reliable to start from the beginning, so that all the films F are rewound into the cartridge 2 once.

In S14, since the loading is stopped halfway, the warning display is terminated. Then, the film F is rewound onto the cartridge 2 and the loading is stopped halfway (S15).

In step S16, a normal winding operation up to the photographable frame which is performed after the reading is completed is included. However, since it is not directly related to the present invention, the operation is ended.

Further, in S17, unlike the end in S16, since the end is after the interruption of the halfway loading, the operation of removing the cartridge 2 from the camera 1 and the like actually follow. Therefore, it is considered that the apparatus is in a standby state until it is extracted.

Next, the rewinding flowchart of FIG. 3 will be described.

In S21, the film F is loaded into the cartridge 2
In order to rewind the film F, the motor 4 is rewound and rotated, and the film F is wound by the fork 5. Thereafter, the photoreflector 6 detects whether or not the film has been completely rewound into the cartridge 2 (S22). If it is wound up, go to S23. If not, repeat the loop. Then, since the rewinding is completed, the motor 4 is stopped (S2
3).

(Correspondence between the Invention and the Embodiment) The reading means capable of reading magnetic information in the present invention indicates the magnetic head 7, and the film winding and rewinding means are the motor 4 and the photo reflector 6. In addition, the electromagnetic wave detecting means indicates the magnetic sensor 8 for detecting external magnetic noise applied to the camera, and the control means indicates the microcomputer 11.

[0038]

As described above, claim 1 of the present application is as described above.
According to the described invention, it is possible to prevent a read head from reading wrong magnetic information due to external magnetic noise.

According to the second aspect of the present invention, by displaying the state of the camera to the user, it is possible to accurately tell whether the normal stop state is a stop due to the intrinsic failure of the camera. Be able to take appropriate actions.

According to the third aspect of the present invention, since the reading operation is automatically restarted, a complicated operation can be omitted.

According to the fourth aspect of the present invention, when resuming the reading operation, it is possible to reliably avoid a mistake in reading the magnetic information.

Further, according to the fifth aspect of the present invention, the camera can not be operated at all by external magnetic noise, and a magnetically readable camera which can be operated even in a place with much magnetic noise can be used. There is.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of the configuration of the present invention.

FIG. 2 is a flowchart showing the operation of the present invention.

FIG. 3 is a flowchart showing a rewind operation.

[Explanation of symbols]

 Reference Signs List 1 camera 1a cartridge chamber 1b spool chamber 2 cartridge F film 3 spool 4 motor 5 fork 6 photoreflector 7 magnetic head 8 magnetic sensor 9 switch 10 warning means 11 microcomputer

Claims (5)

[Claims] 1. A camera comprising: reading means capable of reading magnetic information recorded on a film; film winding and rewinding means; electromagnetic wave detecting means; and control means. The camera further comprises a control sequence for temporarily stopping the winding operation at the same time as the reading operation when the electromagnetic wave detecting means detects extraneous magnetic noise equal to or higher than a predetermined level during reading. 2. A camera comprising: reading means capable of reading magnetic information recorded on a film; film winding and rewinding means; electromagnetic wave detecting means; and control means. When the electromagnetic wave detection means detects extraneous magnetic noise of a predetermined level or more during reading, the control means includes a control sequence for temporarily stopping the winding operation simultaneously with the reading operation, and the magnetic reading operation and the winding operation are performed during the control sequence. A camera comprising a warning unit for displaying a warning while the operation is temporarily stopped. 3. A camera equipped with a reading means capable of reading magnetic information recorded on a film, a film winding and rewinding means, an electromagnetic wave detecting means, and a control means. When the electromagnetic wave detection means detects extraneous magnetic noise of a predetermined level or more during reading, the control means includes a control sequence for temporarily stopping the winding operation simultaneously with the reading operation, and the magnetic reading operation and the winding operation are performed during the control sequence. A camera characterized in that the control means is provided with a control sequence for restarting the reading operation and the winding operation when the external magnetic noise detected by the electromagnetic wave detection means falls below a predetermined level while the operation is temporarily stopped. 4. A camera comprising: reading means capable of reading magnetic information recorded on a film; film winding and rewinding means; electromagnetic wave detecting means; and control means. When the electromagnetic wave detection means detects extraneous magnetic noise of a predetermined level or more during reading, the control means includes a control sequence for temporarily stopping the winding operation simultaneously with the reading operation, and the magnetic reading operation and the winding operation are performed during the control sequence. While the operation is temporarily stopped, when the external magnetic noise detected by the electromagnetic wave detection unit falls below a predetermined level, the control unit includes a control sequence for restarting the reading operation and the winding operation,
In the above control sequence, the control means includes a control sequence for completely rewinding the film to the cartridge containing the film prior to restarting the reading operation and the winding operation. 5. A control device having a sequence for completely terminating the magnetic reading operation and forcibly rewinding the magnetic reading operation and the winding operation while the magnetic reading operation and the winding operation are temporarily stopped, and an external operating means. 2. The camera according to claim 1, wherein