JPH04122921A - Camera using film with magnetic storage part - Google Patents

Abstract

PURPOSE:To attain at least photography even in case of emergency or if a stand-by battery is absent by providing a battery check means and a control means which performs photographing operation while a magnetic head is put not in operation,and performing only fundamental photographing operation for taking a picture if a source voltage is lower than a specific voltage. CONSTITUTION:When a photoreflector 3 is driven, a photoreflector driving circuit 108 counts an ON/OFF signal sent from the photoreflector 3. When a specific counted value is reached, a motor 15 is driven for a specific time. Consequently, a lever 11 moves toward the surface of a film 2 and position restraint by the projection part 11c of the lever 11 is removed, so a lever 6 also moves toward the surface of the film 2 as it is energized by a spring 9, so that a film pressure pad 5 fixed to its raised part 6e is pressed against the surface of the film 2 eventually. Then a magnetic head 4 is driven to read information out of the magnetic storage pat of the film 2 N times. Once the circuit 108 detects the prescribed number of frames, a feed motor 110 is stopped from being driven through a film feed driving circuit 102.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a camera using a film with a magnetic storage section, which is equipped with a magnetic head for writing and reading information to and from the magnetic storage section of the film.

(Background of the Invention) In recent years, the task of setting the leading edge of the film protruding from the film cartridge onto the take-up spool has become cumbersome, and by pulling the leading edge of the film carelessly, the film is exposed and the part becomes unusable. For reasons such as storing the film completely inside (with the leading edge of the film wrapped inside), we use a cartridge case that is inserted into the cartridge chamber from the side of the camera, and then driven by a fork. A system has been proposed in which the film is pushed out from within the housing (US Pat. No. 4,841,319, etc.).

In addition, a method has been proposed (US Pat. No. 4,864,332) in which a film having a magnetic storage section is used, and information such as shutter speed, aperture value, title, etc. is written and read by a magnetic head in the magnetic storage section. .

Therefore, the film stored in the cartridge case as mentioned above is a film with a magnetic storage section, and in addition to using such a cartridge case, a magnetic head is placed inside the camera body, and all the films are wound once. If an attempt is made to realize a so-called rewind type camera in which the film is wound onto a film take-up spool and then rewound into the cartridge case each time a photograph is taken, the following problems will occur.

1) If the magnetic heads for writing and reading were simply placed in contact with the film surface, when the leading edge of the film is pushed out of the cartridge case and guided into the spool chamber, the magnetic heads ( Otherwise, there was a risk that the film would collide with the film presser bat), causing the film to bend or making autoloading impossible.

2) Similarly, during autoloading, if the determined information is read into the camera and the magnetic head remains in contact with the film until the entire film is wound onto the film take-up spool, the information attached to the film will be removed. Dust firmly adheres to the magnetic head and degrades the performance of the magnetic head.

3) When the film and magnetic head are in contact, the load increases, so it takes time to wind the entire film, resulting in a lack of quick shooting performance, and as the load increases, the battery wears out faster.

4) When carrying a camera, for example when walking with the camera hanging from the neck, vibrations may be transmitted to the camera, causing the magnetic head to move slightly and causing damage to the magnetic memory of the film or lume. It may cause an accident.

In view of the above points, the present applicant has previously filed an application in which the magnetic head is retracted from the film surface position except when writing or reading information to the magnetic storage section of the film. This made it possible to solve the above problem.

However, in the above-described camera, unlike a training camp camera, since a magnetic head is used, it is inevitable that the camera consumes more power. Furthermore, in order to read information from the magnetic storage section using a magnetic head, it is necessary to feed the film at a certain high speed. This is because changes in the magnetic field are detected by the magnetic head, so if the film advances slowly, the output response will be poor and the output waveform will become dull. Therefore, when temperature changes are involved, in order to reliably write and read information with the magnetic head, it is necessary to
Cameras will be forced to operate at much higher voltages than before. This means that the number of shots that can be taken is reduced, and if you forget a spare battery, things that you thought you could still take with a previous camera will quickly become impossible to take. occurs. In particular, since the magnetic head is driven during film feeding, the number of films fed due to voltage drop is significantly reduced compared to conventional cameras.

(Object of the Invention) The object of the present invention is to solve the above-mentioned problems and to provide a camera using a film with a magnetic storage unit that can only take photographs even in an emergency or when there is no spare battery. That's true.

(Features of the Invention) In order to achieve the above object, the present invention provides a battery check means that compares a power supply voltage with a predetermined voltage that is a threshold that enables a series of photographing operations using a magnetic head. and control means for performing a photographing operation with the magnetic head inactive when the battery check means detects that the power supply voltage is lower than the predetermined voltage, thereby controlling the predetermined voltage. If the power supply voltage is lower than , the magnetic head will not write or read information.
The present invention is characterized in that only the basic photographing operation of taking a photograph is performed.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 2 is a perspective view showing the main structure of a camera according to an embodiment of the present invention, in which 1 is a film 2 provided with a magnetic storage section (not shown) and a perforation 2a.
(until just before autoloading starts), and the cartridge case 1 is inserted into a cartridge chamber (not shown). A photoreflector 3 is placed at a position where the perforation 2a of the film 2 passes, and detects the feeding state of the film, and a photoreflector 4 reads information written in the magnetic storage section of the film 2 (for example, ISO information, film frame number information, etc.). This is a magnetic head that reads and writes information thereto, and is fixed to a pressure plate (not shown) or the like. 5
is a film holding pad made of an elastic material such as rubber, and the contact surface with the film 2 is made to be as smooth as possible and have a smooth structure. Reference numerals 6 denote a vertical portion 6e that holds the film press bat 5, elongated holes 6a and 6b that slidably fit into a bin 78 provided on the main body side, and protruding portions 6c and 6.
A spring 9 whose other end is attached to the structural member 10 on the main body side is hung on the protruding portion 6c of the lever, and is always biased in the direction of the two surfaces of the film.

Reference numerals 11 denote long portions 11a and 11b that slidably fit into a bin 1213 provided on the camera body side, and the lever 6.
A lever 14 having a protrusion 11c that abuts the protrusion 6d of the lever and a rack 11d that engages with a worm gear to be described later.
is a worm gear which is fixed to the output shaft of the motor 15 and transmits its output to the lever 11, and when the motor 15 rotates in the normal direction, the film presser pad 5 is
moves in the direction of the two sides of the film. 16 is a photographic lens,]
7 is a film take-up spool.

FIG. 1 is an electrical block diagram of this embodiment. In the figure, 101 is a control circuit that controls the entire camera, 102 is a film feeding drive circuit that drives a feeding motor 110 that winds and rewinds the film, and 103 is a photometric circuit, 104
105 is a distance measuring circuit, 105 is a shutter control circuit, 106 is an aperture control circuit, and 107 controls the drive of the motor 15, which causes the film pressing pad 5 to enter (press) the second side of the film via the lever 11.6. 108 is a bat drive circuit for retracting the photoreflector 3
109 is a magnetic recording circuit that controls the magnetic head 4.

110 is a battery check circuit that checks the condition of the battery that is the power source of the camera;
The battery check 1 compares the power supply voltage with a first predetermined voltage that is a threshold level that enables photography with the magnetic head 4 driven, and photography is made possible by prohibiting the driving of the magnetic head 4. It has a function of performing a battery check 2 in which a second predetermined voltage (first predetermined voltage), which is a threshold level, is compared with the power supply voltage.

Next, the operation when rOKJ is detected in the battery check 1 performed by the battery check circuit 110 is performed using the flowchart shown in FIG.

"Step 2o1" When the cartridge case 1 is inserted into the cartridge chamber (not shown) and the lid is closed, the film feeding drive circuit 102 and the feeding motor 11o are driven, and the film 2 is pushed out from the cartridge case 1. Then, winding onto the spool 17 is started. That is, a known autoloading (AL) operation is started. At this time, the film holding pad 5 is in a retracted state, so that the two surfaces of the film to be pushed out do not come into contact with the magnetic head 4.

“Step 202” Photoreflector drive circuit 108
The photoreflector 3 is driven through.

“Step 203” Photoreflector drive circuit 108
counts the ON and OFF signals sent from the photoreflector 3. That is, detection of the number of frames on the film 2 is started.

"Step 204" The photoreflector drive circuit 1
08, when the predetermined number of frames has been counted, that is, when the film 2 has been wound around the film take-up spool 17, the motor 15 is driven (normally rotated) via the butt drive circuit 107 for a predetermined period of time.

When the motor 15 rotates in the normal direction, the lever 11 moves in the direction of the film 2 through the worm gear 14 shown in FIG. According to the bias of the lever 9, the lever 6 also moves in the direction of the second surface of the film, and eventually the vertical portion 6
A film pressing butt 5 fixed to e presses the second side of the film against the magnetic head 4. In addition, the lever 11 at this time
The movement stroke of the lever 6 is larger than the movement stroke of the lever 6. Needless to say, this
This is to ensure that the film pressing butt 5 presses the second surface of the film against the magnetic head 4.

“Step 205” The magnetic head 4 is driven via the magnetic recording circuit 109.

"Step 206" The information written in the magnetic storage section of the film 2 is read out N times.

``Step 207J Determine whether or not the information content is the same N times, and if it is the same, step 207J
Proceed to step 8.

"Step 208" Here, in order to stop reading information, the drive of the magnetic head 4 is stopped via the magnetic recording circuit 109.

"Step 209" Drive the motor 15 for a predetermined time via the butt drive circuit 107 (in this case, step 20
4) energize in the opposite direction to reverse the direction).

As the motor 15 reverses, the lever 1 moves in a direction away from the film 2 surface via the worm gear 14 shown in FIG. Since the portion 6d is pushed, it begins to move in the same direction against the bias of the spring 9,
Eventually, the film pressing pad 5 is retracted from the second side of the film.

"Step 210" When the photoreflector drive circuit 108, which continues to detect the film feeding state, detects a specified number of frames, that is, for example, the magnetic head 4
The film frame number information read from the second side of the film at
6 frames", when the photoreflector drive circuit 108 counts "the number of perforations for 36 frames + the number of perforations for a predetermined number of frames",
Feeding motor 11 via film feeding drive circuit 102
Stop driving 0.

"Step 211" The film feeding drive circuit 102 is processed by the number of perforations corresponding to the predetermined number of frames that have been wound too much.
When this operation is completed, the feeding motor 110 is stopped again. In this state, 36 of film 2 is placed at the aperture position.
The pieces will definitely be in position.

"Step 212" Here, it is determined whether the switch SW1 is turned on or not. If it is turned on, the process proceeds to steps 2 and 3.

[Step 2] 3J Since the switch SW1 is ON, the photometry circuit 103 and distance measurement circuit 104 are driven to obtain photometry and distance measurement information.

"Step 214" Here, release switch SW2
It is checked whether or not is turned on, and if it is turned on, the process advances to step 215.

"Step 215" Since the release switch sw2 is ON, the shutter control circuit 105 and the aperture control circuit 1
06 to perform known exposure control.

Note that if none of the switches SW, , sw2 are turned on, the process returns to step 212.

"Step 216" Drive the motor 15 in the normal direction)
, the film presser pad 5 is advanced to the position of the second side of the film, and the magnetic head 4 is pressed by the film presser pad 5.

"Step 217" The feed motor 110 is reversed via the film feed drive circuit 102. In other words, rewinding of the photographed pieces begins.

“Step 218” Photoreflector drive circuit 108
At this point, it is determined whether or not it is confirmed that the photo reflector 3 has detected the buff odor of the frame, and when it is confirmed, the feeding motor 10 is stopped. It should be noted that during this rewinding of one frame that has been photographed, the magnetic head 4 writes photographing information related to the frame, such as information such as the month and date of the photographing department, into the magnetic storage section of the film 2.

"Step 219" Since the writing of information to the photographic frame has been completed, the motor 15 is driven for a predetermined period of time via the butt drive circuit 107 in order to retract the film presser pad 5 from the second surface of the film.

"Step 220" Here, it is checked whether or not shooting for the specified number of frames has been completed.If not, step 212 is performed.
Go back and repeat the same operation. Thereafter, if the completion is confirmed, the process advances to step 221.

"Step 221" The feed motor 110 is reversed via the film feed drive circuit 102. That is, part of the leader of the remaining film 2 is completely rolled into the cartridge case 1.

This completes the series of operations.

Next, the operation when "OK" is not output in the battery check 1 performed by the battery check circuit 110 will be explained using the flowchart of FIG.

"Step 301" The battery check circuit 11○ is caused to perform battery check 1, and if the result is "OK", the process proceeds to the operation shown in FIG. 3; if not, the process proceeds to step 302.

"Step 302" Now battery check circuit 1
10 to perform battery check 2 and the result is rO
If it is KJ, the process proceeds to step 304; if it is not rOKJ, the process proceeds to step 303.

"Step 303" The result of battery check 2 is r
Since it is not OKI, that is, it is impossible to take pictures without driving the magnetic head 4 (a state in which basic camera operations cannot be performed), the release is locked.

"Step 3o4" Set the IS○ information to be set. In this case, since the ISO information cannot be read by the magnetic head 4, the information input using the ISO setting button is set, similar to the camera at the training camp.

After that, steps 201 to 20 explained in FIG.
3 and the same operations as those between steps 210 and 221 are performed. Note that in step 217', no information is written, and only one frame's worth of winding is performed.

FIG. 5 is a flowchart showing the operation of the main parts in another embodiment of the present invention.

The difference from the embodiment in FIG. 4 is step 401.40.
This is the 2,403 part. That is, in step 401 after battery check 2, a warning operation is performed in order to prevent photography from proceeding without information being read or written by the magnetic head 4 without the photographer's knowledge. In step 402, the state of a manual switch is determined to determine whether or not to proceed with photography without information being read or written by the magnetic head, and if the switch is OFF, the process proceeds to step 403, where a release rotation is performed; If it is ON, the operation after step 304 explained in FIG. 4 is proceeded.

The types of warnings in step 401 are sound, LC
Various methods such as D display can be considered.

According to this embodiment, battery check 1 is "OK"
If not, perform battery check 2, and if the result is "OK", the head will not be driven and the camera will only perform the basic operation of taking a picture, so in case of an emergency or if you have spare batteries. It is possible to take pictures even if there is no camera.

(Effects of the Invention) As explained above, according to the present invention, a battery check means is provided that compares a power supply voltage with a predetermined voltage that is a threshold value that enables a series of photographing operations using a magnetic head. and control means for performing a photographing operation with the magnetic head inactive when the battery check means detects that the power supply voltage is lower than the predetermined voltage, thereby controlling the predetermined voltage. If the power supply voltage is lower than , the magnetic head will not write or read information.
Since only the basic photographing operation is performed, even in an emergency or when there are no spare batteries, it is possible to take a photograph.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a perspective view similarly showing the configuration of main parts, FIGS. 3 and 4 are flowcharts showing the operation of an embodiment of the present invention,
The figure is a flowchart showing operations of main parts in another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Patrone housing, 2... Film, 4... Magnetic head, 101... Control circuit, 102... Film feeding Drive circuit, 1
09...Magnetic recording circuit, 110...Battery check circuit.

Claims (2)

[Claims] (1) In a camera using a film with a magnetic storage section that is equipped with a magnetic head that writes and reads information to and from the magnetic storage section of the film, it is a threshold value that enables a series of photographing operations using the magnetic head. a battery check means for comparing a predetermined voltage with a power supply voltage; and if the battery check means detects that the power supply voltage is lower than the predetermined voltage, photographing is performed with the magnetic head inactive; 1. A camera using a film with a magnetic storage section, characterized in that it is provided with a control means for performing an operation. (2) The film with a magnetic memory unit according to claim 1, further comprising warning means for displaying a warning when the battery check means detects that the power supply voltage is lower than a predetermined voltage. camera.