JP2791611B2 - Camera and film use control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film with a magnetic storage unit.
Camera with a magnetic storage unit
The present invention relates to a film use restricting device applied to lum .

[0002]

2. Description of the Related Art Conventionally, there is provided a means for rewinding a film in the middle of shooting using a film with a magnetic storage unit. When a rewind film is loaded into a camera again, a camera has been proposed in which the record is read out, and the film is automatically fed to a frame which has not been photographed, and the film can be photographed again from that frame. I have.
(See, for example, U.S. Pat. No. 4,864,332).

[0003]

As described above, in a camera capable of rewinding a film halfway, as long as at least one frame that has not been shot remains, loading and rewinding to the camera can be performed any number of times. However, when the film is loaded into the camera and fed, the film advances while being rubbed between the film entrance and exit of the cartridge and between the pressure plate and the rail surface, and also by the pressing roller of the spool.
Due to the strong frictional force, fine scratches are formed on the film surface, and the scratches increase in proportion to the number of rewinds during the above process. Could stand out, ruining your photos. The present invention
The film was partially used
Film when rewinding and reusing in the middle
And film that can prevent inconvenience caused by deterioration of the camera
It is intended to provide a use control device.

[0004]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
Since the present invention uses a film with a magnetic storage unit,
Camera, the unused portion of the film remains
The number of rewinds in the middle of the film
Writing means for writing to a storage unit, and magnetic storage of the film
Reading means for reading the number of rewinds on the way from the section;
The number of times of rewinding read by the reading means is equal to or less than a predetermined number of times.
In the case above, a regulatory measure to regulate the use of the film
And a step having a step.
You. In order to achieve the above object, the present invention provides a magnetic recording device.
In the use control device applied to the storage film,
While rewinding the film with unused parts remaining
Writer for writing the number of rewinds to the magnetic storage section of the film
Step and the intermediate rewinding from the magnetic storage section of the film.
Reading means for reading the number, before reading by the reading means
If the number of rewinds in the middle is more than a predetermined number, the film
Use of a film having regulating means for regulating the use of
It is a device for restricting use.

[0005]

[0006]

1 to 7 show a first embodiment of the present invention.
FIG. 1 is an electric circuit block diagram of the present embodiment, wherein 1 is a control unit composed of a microcomputer or the like for controlling the entire camera, and 2 is a unit for writing and reading information to and from a magnetic storage unit provided on a film. Do magnetic head,
Reference numeral 3 denotes a magnetic recording circuit for controlling the magnetic head 2, and reference numeral 4 denotes a head retraction drive circuit for moving the magnetic head 2 to a position where the magnetic head 2 comes into contact with the film and a position where the magnetic head 2 is retracted from the film surface. Japanese Patent Application No. 1-338 filed by the applicant
No. 457. Reference numeral 5 denotes a film feed drive circuit for driving a feed motor (not shown) for winding and rewinding the film. Reference numeral 6 denotes a photometric circuit; 7, a distance measuring circuit; 8, a shutter control circuit; A perforation detection circuit that counts the film perforation using a photo reflector or the like; 11 is a film use state detection that detects whether the film has been photographed for all frames, some frames have been photographed, or all frames have not been exposed. A circuit 12 is a display unit for displaying the camera aperture, shutter speed, film sensitivity, and various warnings. Reference numeral 13 denotes a photometry start switch, and reference numeral 14 denotes an exposure start switch. These switches are configured to be turned on by the first stroke and the second stroke of one switch member. Reference numeral 15 denotes a patrone switch for detecting that a film cartridge is loaded in the camera, 16 denotes a back cover switch for detecting that the back cover is closed, and 17 denotes an intermediate winding for rewinding the film in the middle. It is a return switch.

FIG. 2 is a perspective view showing a film cartridge known from US Pat. No. 4,947,197.
20 is a film cartridge main body, 20a is a display indicating that the film has not been exposed to all frames (hereinafter abbreviated as UN),
20b is a display indicating that only some frames have been shot (hereinafter abbreviated as PA), 20c is a display indicating that all frames have been shot (hereinafter abbreviated as EX), and 20d is a film outlet. is there. Reference numeral 21 denotes a fork engaging portion which is integrally formed with a film spool in the cartridge and which allows the film to be extruded and rewinded by engaging with a fork of a camera. Reference numeral 22 denotes an index ring including a tapered portion 22a on which an arrow is printed. The fork engaging portion 21 and the index ring 22 are configured to be independently rotatable with respect to the film cartridge body 20.

FIG. 3 is a top view of a film cartridge used in this embodiment in which the film cartridge body 20 is improved.
1 and the index ring 31a are integrally formed, so that the display can be switched according to the stop position of the fork of the camera. In FIG. 3, reference numeral 32 denotes a photoreflector provided in the patrone room of the camera. By inputting a signal from the photoreflector 32 to the film use state detection circuit 11, the use state of the film can be determined.

FIG. 4 shows the film cartridge 30 of FIG.
FIG. 3 is a view showing a state in which the film 33 is pulled out from FIG.
Reference numerals 4 and 35 denote photographing screens, 38 and 39 denote magnetic recording areas for magnetically recording information on the respective photographing screens, 36 denotes a data frame that is not actually photographed, and 40 denotes information on the entire film, for example, film information. This is a magnetic recording area in which the ID and the information indicating which frame has not been exposed when being rewound halfway, or the number of times of rewound halfway in this embodiment are recorded. 37 is a perforation provided on the film 33.

FIG. 5 is a rear view of the camera of this embodiment, with the back cover removed. In the figure, 41 is a camera body, 42 is a finder, 43 is a film cartridge 3
0 is a patrone chamber, 44 is engaged with the fork engaging portion 31 of the film cartridge 30, and a fork for winding and rewinding the film is provided.
Reference numeral 46 denotes a photoreflector for detecting the perforation 37. Reference numeral 46 denotes a position where the magnetic head 2 is pressed against the film surface. 47 is an aperture, 48 is a rail for guiding the film, 49 is a spool chamber, 50 is a spool for winding the film 33, 51 is a halfway rewind button, and when this button is pressed, the halfway rewind switch 1
7 turns on.

Next, FIG. 6 showing the operation of the control circuit of FIG.
The operation of this embodiment will be described with reference to the flowchart of FIG. FIG. 6 shows the operation from the loading of the film cartridge to the completion of shooting preparation in the pre-wind type camera. When the film cartridge 30 is loaded in the patrone chamber 43 of the camera, the patrone switch 15 is turned on (step 101), and When the lid is closed, the back lid switch 16 is turned on (step 102). In step 103, the use state of the film is determined by the detection method of FIG. 3, and if it is determined that the film is in the EX (all frames have been shot) state, the process proceeds to step 113, and the display unit 12 disables the use of the film. Warn that. Also,
If it is determined that the use state of the film is UN (all frames are not exposed), the process proceeds to step 121, where the film feed drive circuit 5 drives the film feed motor to start prewinding. Next, the routine proceeds to step 122, in which the perforation of the film is counted by the perforation detection circuit 10, and in step 123, a predetermined perforation is counted, and it is determined whether or not prewinding has been completed. If not, the process returns to step 122; if completed, the process proceeds to step 124, where the film feed drive circuit 5 stops the film feed motor.

If it is determined in step 103 that the use state of the film is PA (only some frames have been photographed), the process proceeds to step 104, in which the film feed drive circuit 5 drives the film feed motor. And start the prewind. Next, in step 105, by Per Four configuration detection circuit 10 detects the leading end of the film, when it is detected, after the timer time t ₁ has elapsed in step 106, in step 107, the magnetic head retracting circuit 4, The magnetic head 2 is brought into contact with the film surface. Next, in step 108, the data in the magnetic recording area 40 of the film 33 is read by the magnetic recording circuit 3. At this time, among the read data, it is determined whether or not the number of halfway rewinds x is smaller than a predetermined number N (step 109).
Then, the program proceeds to step S108 to determine whether the number of unexposed frames matches the number of frames detected by the perforation detection circuit 10 based on the data on unexposed frames among the data read in step 108. It is determined whether or not the end of the exposure frame has been reached. If the end has been reached, the routine proceeds to step 111, where the film feed drive circuit 5 stops the film feed motor.
Further, in step 112, the magnetic head 2 is retracted from the film surface by the magnetic head retract driving circuit 4.

If it is determined in step 109 that the number x of intermediate rewinds is equal to or greater than the predetermined number N, step 1
Proceeding to 14, the film feeding drive circuit 5 causes the film feeding motor to rotate in the reverse direction to start film rewinding.
Next, in step 115, detects the leading edge of the film by Per Four configuration detection circuit 10, when it is detected, in step 116, the timer time t ₂ after,
In step 117, the position of the index 31a of the index ring of the film is detected by the film use state detecting circuit 11, and if it is pointing to PA, the process proceeds to step 118, where the film feeding drive circuit 5 causes the film feeding motor 5 to operate. Is stopped, and rewinding is terminated. Note that the timer time t ₂ is a time required for completely winding the film into the cartridge. Further, in step 119,
Step 12: The magnetic head 2 is retracted from the film surface.
At 0, the display unit 12 warns that the film cannot be used.

FIG. 7 shows the operation from photographing to rewinding. In step 201, it is checked whether the photometry switch 13 is on or not.
The program proceeds to step 2 where the photometric circuit 6 and the distance measuring circuit 7 are operated, and the photometric and distance measuring operations are performed based on information obtained by these circuits. Next, in step 203, the exposure switch 1
It is checked whether or not the shutter 4 is turned on. If the shutter is turned on, the flow advances to step 204 to operate the shutter control circuit 8 and the aperture control circuit 9 to start an exposure operation. Then step 2
At step 05, it is checked whether the exposure operation has been completed. If the exposure operation has been completed, the routine proceeds to step 206, where the head retraction drive circuit 4 is operated to bring the magnetic head 2 into contact with the film surface. It should be noted that a method of detecting whether or not the exposure operation has been completed is, for example, a known method such as a shutter rear curtain running completion signal. Next, in step 207, the film feed driving circuit 5 is operated to start rewinding the film 33. In step 208, the operation of the magnetic recording circuit 3 causes the film 33 to operate.
The shooting conditions and any data corresponding to the comment are recorded. Next, in step 209, the number of perforations is counted by the perforation detection circuit 10, and it is checked whether or not the perforation of one frame has been counted (step 210). Proceeds to step 211 to determine whether or not the number of photographable frames recorded in the magnetic recording area 40 of the film 33 matches the number of frames detected by the perforation detection circuit 10 whether or not the photographed frame is the last frame. By determining whether or not the frame is the last frame taken, it is checked whether the frame is the last frame. If the result is negative, the process proceeds to step 212, where the film feed drive circuit 5 stops the film rewinding. Next, at step 213, the midway rewind switch 17
Is detected, and if not, the process returns to step 201 and repeats the photographing operations from 201 to 213.

If the last frame is detected in step 211, the process proceeds to step 225, where data is recorded by the magnetic recording circuit 3 in the magnetic recording area 40 of the data frame 36 in FIG. In step 226, par Four examined whether the configuration detection circuit leading end of the film has passed, in step 227 when it detects the passage, in the timer time t ₂ elapses after the step 228, using the state detection circuit 11 of the film , The position of the index 31a of the index ring of the film is detected, and if the index ring 31a points to EX, the process proceeds to step 229, where the film feeding drive circuit 5
The film feeding motor is stopped, and the rewinding is completed.
Further, in step 230, the magnetic head 2 is retracted from the film surface.

If it is detected in step 213 that the intermediate rewind switch 17 is turned on, the flow advances to step 214 to drive the film feed motor by the film feed drive circuit 5 to start film rewind. I do. Next, in step 215, the number of perforations is counted by the perforation detection circuit 10, and it is checked that the data frame 36 and the aperture 47 are opposed to each other (step 216). , The number of rewinds x ′ = x + 1 on the way to the magnetic recording area 40 of the data frame 36 is recorded.
Next, proceeding to step 218, the perforation detection circuit checks whether or not the leading end of the film has passed.
In step 219 if it detects the passage, in the timer time t ₂ elapses after step 220, the use state detection circuit 11 of the film, the index of the film ring 31a
Is detected, and if the index ring 31a points to PA, the routine proceeds to step 221, where the film feeding drive circuit 5
In step 1, the film feeding motor is stopped, and the rewinding is completed. Further, in step 222, the magnetic head 2
From the film surface. Next, in step 223, it is determined whether or not the number of medium rewinds x 'recorded in step 217 is equal to a predetermined number N. If the result is negative, the operation is terminated.
Proceeding to 24, the display unit 12 warns that the film cannot be used again.

Next, another operation of this embodiment will be described with reference to the flowchart of FIG. FIG.
6 is a flowchart showing the operation from the loading of the film cartridge to the completion of the preparation for shooting. The difference from FIG. 6 is step 301, and the other operations are the same, so the same step numbers as in FIG. Is omitted. In FIG. 8, in step 301, the index ring 3
It is detected that the index position 1a has reached the position indicating EX, and the rewinding of the film is stopped (step 11).
8).

FIG. 9 shows the operations from photographing to rewinding. The same operations as those in FIG. 7 are denoted by the same step numbers, and detailed description is omitted. In FIG. 9, step 4
01, the recorded number of rewinds x ′ is a predetermined number N
It is determined whether or not the index ring 3 is equal to the index ring 3 of the film cartridge.
It is checked whether or not the index position 1a points to PA.
If the result is affirmative, the film rewinding is stopped in step 403, and the head is retracted in step 404. If the result in step 401 is affirmative, the process proceeds to step 405, where the index 31a of the index ring is set.
To see if it points to EX. If the result is affirmative, the rewinding of the film is stopped in step 406, and in step 407, the magnetic head 2 is retracted from the film surface. Further, the display unit 12 warns that the film cannot be used again (step 408).

FIGS. 10 to 12 show another embodiment of the present invention. In this embodiment, in a camera having no film use state detecting circuit 11 as in the above-described embodiment, the use state of the film is changed. Is determined based on the data recorded in. 10 is the same as the configuration in FIG. 5 except that the film use state detection circuit 11 is not provided, the same components as those in FIG. 5 are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of this embodiment will be described with reference to the flow chart showing the operation of the control circuit 1 in FIG. FIG. 11 shows the operation from the loading of the film cartridge to the completion of the preparation for photographing. The same operations as those in FIG. 6 are denoted by the same step numbers, and the description of overlapping parts will be omitted. Also,
6 is different from FIG. 6 in step 501. In step 501, the use state of the film 33 recorded in the magnetic recording area 40 of the data frame 36 of the film is read to determine the distinction. In step 502, the state of use of the film is recorded as EX in the magnetic recording area 40.

FIG. 12 shows the operations from photographing to rewinding. The same operations as those in FIG. 7 are denoted by the same reference numerals, and the description of the overlapping parts will be omitted. 12 is different from FIG. 7 in step 601. In this case, the number of times of rewinding x ′ = x + 1 and the fact that the use state of the film is PA is recorded. In step 602, it is recorded that the use state of the film is EX.

In each of the above embodiments, a camera employing a prewind system has been described. However, it is needless to say that the present invention can be similarly applied to a camera employing a normal winding system. Further, in the above embodiment, the number of rewinds in the middle is recorded in the data frame in the film leader, but the recording location is not limited to this, and the recording location is not limited to the magnetic recording area for each frame. You can record it.

[0023]

As explained above, according to the present invention,
Rewind part of the used film halfway and use it again.
Can prevent inconvenience caused by film deterioration
Camera and film use control equipment
You.

[Brief description of the drawings]

FIG. 1 is an electric circuit block diagram showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a known film cartridge.

FIG. 3 is a top view of the film cartridge of the embodiment of FIG.

FIG. 4 is a view showing a state where a film is drawn from the film cartridge of FIG. 3;

FIG. 5 is a rear view of the camera of the embodiment.

FIG. 6 is a flowchart of the first embodiment (from cartridge loading to photographing preparation).

FIG. 7 is a flowchart (photographing to rewind) of the first embodiment.

FIG. 8 is a flowchart (cartridge loading to imaging preparation) of a second embodiment of the present invention.

FIG. 9 is a flowchart (photographing to processing) of a second embodiment of the present invention.
Rewind).

FIG. 10 is an electric circuit block diagram of a third embodiment of the present invention.

FIG. 11 is a flowchart (cartridge loading to photographing preparation) of a third embodiment of the present invention.

FIG. 12 is a flowchart (photographing to rewind) of a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Camera control unit 2 Magnetic head 3 Magnetic recording circuit 5 Film feed drive circuit 11 Film use state detection circuit 17 Halfway rewind switch 30 Film cartridge 41 Camera body 44 Fork 47 Aperture 50 Spool

Claims (2)

(57) [Claims] 1. Use of a film with a magnetic storage unit
In a camera that can do
The number of times the film was rewound while the film was
Writing means for writing in a magnetic storage unit;
Reading means for reading the number of halfway rewinds from the storage unit;
The number of rewinds on the way read by the reading means is a predetermined number
In the above cases, regulations for regulating the use of the film
And a camera. 2. A film applied to a film with a magnetic storage unit.
Unused portion of film remains
The number of rewinds in the middle of rewinding
Writing means for writing to the magnetic storage section of the
Reading means for reading the number of halfway rewinds from the air storage unit
And the number of rewinds in the middle read by the reading means
If more than a certain number of times to regulate the use of the film
Film use regulation characterized by having regulation means
Control device.