JPH0669942U - Camera that can input film information - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a camera capable of obtaining accurate film information from a barcode pattern of a cartridge. [Structure] A bar code pattern 502 that rotates in synchronization with initial film winding by the film feeding means 101.
Whether or not the film information is accurate based on a plurality of film information which is continuously read by the reading / decoding means 102 for optically reading the film and decoding the content to obtain film information. And a determination means 104 that outputs a decoding success signal when it is determined to be correct,
After the film is initially wound, the feeding means 101 and the reading / decoding means 102 continue to operate until the decoding success signal is output. When the decoding success signal is output, a predetermined unexposed frame (for example, the first frame) is output. The control means 105 controls the feeding means 101 so that the eye) faces the aperture, and the film information determined to be accurate is set as information for photographing control.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a camera for inputting film information from a barcode pattern of a cartridge.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a film cartridge having a bar code pattern (representing film information such as film ISO sensitivity and number of shots) that rotates with the feeding of a film is known. A camera is also known in which the rotating bar code pattern is read through a photo reflector or the like when the film is initially wound and the read content is decoded to obtain the film information.

[0003]

[Problems to be solved by the device]

 By the way, when reading this type of bar code pattern, accurate information cannot always be read due to the effects of fluctuations in the film feeding speed, etc. Therefore, the film information obtained by only one reading operation can be read. Is extremely unreliable. However, the conventional camera does not consider the reliability of the information, and the film information read from the start of the initial hoisting to the first frame facing the aperture is used for the shooting control. Since it is used as the information of the above, there is a high possibility that, for example, an incorrect exposure photograph is taken with incorrect ISO sensitivity information.

An object of the present invention is to provide a camera capable of inputting film information which enables accurate film information to be obtained from a barcode pattern of a cartridge.

[0005]

[Means for Solving the Problems]

 Referring to FIG. 1, which is a claim correspondence diagram, the present invention is a camera using a film cartridge 500 provided with a bar code pattern 502 that rotates as the film 501 is fed. The film feeding means 101 for winding and rewinding, and the rotating bar code pattern 502 are optically read in synchronization with the initial winding of the film by the film feeding means 101, and the read contents are decoded. The present invention is applied to a camera provided with a reading / decoding means 102 for obtaining film information and an information setting means 103 for setting the obtained film information as photographing control information. Then, in claim 1, whether or not the film information is correct is judged based on a plurality of film information continuously obtained by the reading / decoding means 102, and if judged to be correct, a decoding success signal is sent. After the initial winding of the film and the start of film winding, the feeding means 101 and the reading / decoding means 102 are allowed to continue their operations until the decoding success signal is output. And a control means 105 for controlling the feeding means 101 so that the unexposed frame (for example, the first frame) faces the aperture, and the film information determined to be accurate as described above is used for photographing control. To solve the above problem. According to a second aspect of the present invention, the determining means 104 and the feeding means 101 are stopped when a predetermined unexposed frame faces the aperture after the initial film winding is started, and a decoding success signal is output at this point. If so, the filming is permitted, and if the decoding success signal is not output, the film is rewound, and after the rewinding is completed, the feeding means 101 and the reading / decoding means 102 are used to perform the initial film winding, information reading and decoding again. And a control means 205 for actuating. Information is read and decoded in synchronization with the rewinding of the film after the film feeding is stopped.If the decoding success signal is output when the rewinding is completed, only the initial film winding is performed, and when the rewinding is completed. If the decoding success signal is not output, the feeding means 101 and the reading / decoding means 102 may be controlled to perform the initial winding of the film, reading of information, and decoding. Furthermore, information is read and decoded in synchronism with the rewinding of the film after the film feeding is stopped, and when the decoding success signal is output before the rewinding is completed, the film is fed to perform the initial film winding. The means 101 may be activated.

[0006]

(1) Invention of Claim 1 The bar code pattern 502 is read and decoded at the time of initial winding of the film. The judging means 104 judges whether or not the film information is correct on the basis of a plurality of film information continuously obtained by the decoding, and outputs a decoding success signal when judging that the film information is correct. The control means 105 continues film winding and information reading / decoding until the decoding success signal is output, and when the decoding success signal is output, the predetermined unexposed frame is made to face the aperture. Then, the film information determined to be accurate is set as information for shooting control. (2) The invention of claim 2 After the start of the initial winding of the film, the winding is stopped when a predetermined unexposed frame faces the aperture. If the decoding success signal is not output at this point, the film is rewound. After the rewinding is completed, the initial film winding, information reading, and decoding are performed again. After that, if a decoding success signal is output when a predetermined unexposed frame faces the aperture, photographing is permitted.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. In FIG. 2, 1 is a camera according to the present invention, 2 is a film cartridge, and the cartridge 2 is a cartridge by opening a cartridge lid 3 (FIG. 3 (a)) on the bottom of the camera body. It can be loaded axially into the room. A spool shaft 2a (FIG. 3 (b)) around which the film is wound is rotatably accommodated in the cartridge 2, and the upper surface of the cartridge 2 is shown in FIGS. 4 and 5. As described above, a disc 2b that is rotatable integrally with the spool shaft 2a is provided, and a bar code pattern consisting of a white portion and a black portion that represents film information such as the film ISO speed and the number of shots is provided on the upper surface of the disc 2b. It is drawn.

Reference numeral 21 in FIG. 5 is a photo reflector fixed in the camera body, and the bar code pattern of the disc 2 b is read via the photo reflector 21. That is, the photo reflector 21 has a light projecting unit that projects light on a part of the rotating barcode pattern and a light receiving unit that receives the reflected light from the barcode pattern and photoelectrically converts it. The photoelectric conversion output of the light receiving unit is It is read by the CPU 31 shown in FIG. The CPU 31 decodes the photoelectric conversion output read during one rotation of the bar code pattern to obtain a set of film information.

In FIG. 6, the CPU 31 also includes a motor drive circuit 32 of the film feeding motor 33, a photo reflector 34 for detecting a plurality of perforations (not shown) formed in the film at predetermined intervals, A lid switch SW1 which is turned on in association with the closing operation of the cartridge lid 3 and a cartridge presence / absence switch SW2 which is turned on when the cartridge 2 is loaded are connected. When the feeding motor 33 is normally rotated, the take-up spool 4 (FIG. 3 (b)) of the camera rotates in the winding direction, and the spool shaft 2a of the loaded cartridge 2 rotates in the same direction. As a result, the film is delivered from the cartridge 2 and wound up on the take-up spool 4. On the other hand, when the feeding motor 33 is rotated in the reverse direction, the spool shaft 2a is rotated in the rewinding direction and the film is rewound into the cartridge 2.

Further, a perforation counter (not shown) is provided in the CPU 31, and this counter counts up the count value every time the perforation is detected by the photo reflector 34 during film winding. When rewinding the film, the count value is decremented each time the perforation is detected. Therefore, the film feeding state can be determined based on this count value, and at the same time, a predetermined frame can be made to face the aperture.

Next, the control procedure at the time of initial film winding (film loading) by the CPU 31 will be described based on the flowchart of FIG. First, in step S1, the state of the cartridge lid switch SW1 is determined. If it is on, it is determined that the cartridge 2 is loaded, and the process proceeds to step S2 to determine the state of the cartridge presence / absence switch SW2. If it is determined that the presence / absence switch SW2 is off (cartridge not loaded), the process returns to step S1, and if it is determined to be on (cartridge loaded), the process proceeds to step S3.

In step S3, the forward rotation of the feeding motor 33 is started via the motor drive circuit 32 to perform the initial film winding. As a result, the spool shaft 2a of the cartridge 2 and the take-up spool 4 of the camera both rotate in the winding direction, the film is sent out from the cartridge 2, and the disc 2b, that is, the bar is integrated with the spool shaft 2a. The code pattern rotates. In step S4, the photoelectric conversion output of the photo reflector 21 for detecting the bar code pattern is read three times (for three rotations of the bar code pattern), and the contents of each are read to obtain three pieces of film information.

Here, the film delivered from the cartridge 2 passes through the aperture to reach the take-up spool 4, and is then wound up on the spool 4. The first frame faces the aperture when it is wound by a predetermined amount, but the bar code rotates 4 to 5 times from the start of the normal rotation of the motor 33 until the first frame faces the aperture. .

In step S5, it is determined whether accurate film information is obtained. Here, if two or more of the above three pieces of film information are the same, it is determined that the same information is correct film information, and if all three pieces of information are different, accurate information is obtained. Judge that it was not. If it is determined that accurate information has been obtained, the film feeding is stopped in step S6. If it is determined that accurate information has not been obtained, the process returns to step S4 and the processes of steps S4 and S5 are repeated.

After the film feeding is stopped, in step S7, based on the count value of the perforation counter described above, it is determined that the first frame of the film has not yet reached the aperture, or the first frame has already reached the aperture. -Determine whether it has passed through the cha. In the former case, the forward rotation of the feeding motor 33 is started to wind the film in step S8, and in the latter case, the reverse rotation of the feeding motor 33 is started in step S9 to rewind the film.

In step S10, it is determined from the count value of the perforation counter whether or not the first frame faces the aperture. That is, for example, in the case where the first frame faces the aperture when N perforations are detected from the start of film loading, when the count value of the perforation counter reaches "N", the first It can be determined that the piece faces the aperture. When the step S10 is affirmed, the process proceeds to step S11, and the film information determined to be accurate in step S5 is set as information for photographing control. When the information is set, the process ends, and then a shooting control routine (not shown) is started.

According to the above procedure, the bar code pattern is continuously read and decoded during the initial winding of the film, and the above reading and decoding are continued until it is determined that the decoded information is accurate. . If it is determined that the information is accurate, the film is wound or rewound according to the film feeding state at that time, and photographing is permitted when the first frame faces the aperture. Therefore, it is possible to always shoot with accurate film information.

In the configuration of the above embodiment, the feeding motor 33 and the motor drive circuit 32 are the film feeding means 101, the photoreflector 21 and the CPU 31 are the reading / decoding means 102, and the CPU 31 is the information setting means 103. Means 104 and control means 105 are respectively configured.

FIG. 8 shows another embodiment, and the same parts as those in FIG. 7 are designated by the same reference numerals. In FIG. 8, after the normal rotation of the motor 33 is started in step S21, the output of the photoreflector 21 is read and decoded in step S22, and the obtained film information is stored. The process of step S22 is repeated until it is determined in step S23 that the first frame of the film has faced the aperture, and when facing, the motor 33 is stopped in step S24. In step S25, it is determined whether accurate film information has been obtained. Here, of the plural pieces of film information (5 if the bar code rotates 5 times from the start of the normal rotation of the motor 33 until the first frame faces the aperture), which are decoded and stored in step S22. , It is determined whether or not there are three or more identical values, and if affirmative, it is determined that the film information is accurate, and the process proceeds to step S26, where the film information is set as information for shooting control. , Processing ends.

On the other hand, if step S25 is negative, the process proceeds to step S27, the motor 33 is rotated in the reverse direction to start film rewinding, and the bar code pattern is read, decoded and stored in step S28. Step S28 is repeated until it is determined in step S29 that rewinding is completed, and when rewinding is completed, it is determined in step S30 whether the obtained film information is accurate. The determination direction is the same as that in step S25. If step S30 is denied, the process returns to step S21 to repeat the processing from step S21 onward, and if affirmed, the process proceeds to step S31. In step S31, the feeding motor 33 is once stopped and then rotated in the normal direction to start film feeding and winding. In step S32, the process waits until the first frame faces the aperture, and when the first frame faces the aperture, the motor 33 is stopped in step S33 and the process proceeds to step S26.

That is, according to the procedure of FIG. 8, when the film is initially wound and the information is read and decoded continuously, and the first frame faces the aperture, whether the film information is accurate or not is determined. The winding is stopped regardless of the above. Then, at this point, it is judged whether the information is accurate or not, and if it is correct, shooting is allowed as it is, but if it is not correct, the film is rewound and the information is read and decoded in synchronization with the rewind. Will be repeated. After the rewinding is completed, it is judged whether the film information is correct or not, and if it is correct, the film is wound up to the first frame, and if it is not correct, the initial winding and information reading and decoding are performed again as in the original. It will be repeated. This also makes it possible to always perform shooting using accurate film information.

Note that, as shown in FIG. 9, it may be possible to judge whether the film information is accurate during the film rewinding. In this example, if the film information is judged to be accurate during rewinding, the film is wound after waiting for the rewinding to be completed.However, when the film information is judged to be accurate, the film winding starts immediately. You may do it. Further, as shown in FIG. 10, information reading and decoding may not be performed at the time of rewinding, and information reading and decoding may be performed again at the time of initial film winding after the rewinding is completed.

In the above, the film information is set immediately before the processing is finished (step S26), but it may be set immediately after the film information is determined to be accurate. Further, in the above, the first frame is opposed to the aperture when the film information is determined to be accurate, but this is not limited to the first frame. For example, in the case of a cartridge that has been loaded halfway and the cartridge that has been previously photographed halfway, the first unexposed frame faces the aperture. Furthermore, the method of determining whether or not the film information is accurate is not limited to the above-described method. For example, if 6 out of 10 pieces of information are equal, the same piece of information may be judged as accurate. Alternatively, if a predetermined number of pieces of the same information are continuously obtained, the information may be determined to be accurate. Furthermore, the present invention can be applied to a so-called prewind type camera in which the film is wound to the end after the cartridge is loaded, and then the film is rewound one frame at a time for each shooting.

[0024]

[Effect of device]

 According to the invention of claim 1, after starting the initial film winding, the film winding and the information reading are continued until the decoded film information is judged to be accurate, and when the information is judged to be accurate, the predetermined frame is opened. -Since it is made to face the cha, it is possible to always obtain accurate film information without being affected by fluctuations in the film feeding speed, etc., and it is possible to eliminate the adverse effects such as exposure errors due to incorrect film information. Further, according to the invention of claim 2, the winding is stopped when a predetermined unexposed frame faces the aperture after the initial film winding is started, and the film is rewound if the film information is not determined to be accurate at this point. After the rewinding is completed, the initial winding of the film and the reading and decoding of information are performed again, so that the same effect as described above can be obtained.

[Brief description of drawings]

FIG. 1 is a complaint correspondence diagram.

FIG. 2 is a perspective view showing a camera and a film cartridge according to an embodiment of the present invention.

3A is a bottom view of the camera, and FIG. 3B is a view for explaining a film feeding operation.

FIG. 4 is a top view of a film cartridge.

FIG. 5 is a view showing a photo reflector for detecting a bar code pattern on the upper surface of the cartridge.

FIG. 6 is a block diagram showing a control system of the camera.

FIG. 7 is a flowchart illustrating the operation of the embodiment.

FIG. 8 is a flowchart illustrating the operation of another embodiment.

9 is a flowchart showing a modified example of FIG.

FIG. 10 is a flowchart showing a further modified example.

[Explanation of symbols]

 1 Camera 2 Film Cartridge 2a Spool Shaft 2b Disk 4 Winding Spool 21 Bar Code Detection Photo Reflector 31 CPU 32 Motor Drive Circuit 33 Feed Motor 34 Perforation Detection Photo Reflector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideomi Hibino 3 2-3 Marunouchi, Chiyoda-ku, Tokyo Inside Nikon Corporation

Claims (4)

[Scope of utility model registration request] 1. A camera that uses a film cartridge provided with a bar code pattern that rotates as the film is fed, the film feeding means for winding and rewinding the film, and the film feeding means. The reading / decoding means for optically reading the rotating bar code pattern and decoding the read contents to obtain film information in synchronization with the initial winding of the film by the feeding means, and the filming control of the obtained film information. In a camera provided with information setting means for setting as information for use, it is determined whether or not the film information is accurate based on a plurality of film information continuously obtained by the reading / decoding means, Judging means for outputting a decoding success signal when judged, and the above-mentioned until the decoding success signal is output after the film initial winding is started The feeding means and the reading / decoding means are continued to operate, and when the decoding success signal is output, there is provided control means for controlling the feeding means so that a predetermined unexposed frame faces the aperture. The camera capable of inputting film information, wherein the information setting means sets the film information determined to be accurate as the information for shooting control. 2. A camera using a film cartridge provided with a bar code pattern which rotates with the feeding of a film, the film feeding means for winding and rewinding the film, and the film feeding means. A reading / decoding unit that optically reads the rotating bar code pattern and decodes the read content to obtain film information in synchronization with the initial winding of the film by the feeding unit, and shooting control of the obtained film information. In a camera provided with information setting means for setting as information for use, it is determined whether or not the film information is accurate based on a plurality of film information continuously obtained by the reading / decoding means, Judgment means that outputs a decoding success signal when judged, and when a predetermined unexposed frame faces the aperture after the initial film winding is started. While stopping the feeding means, if the decoding success signal is output at this time, shooting is permitted, and if the decoding success signal is not output, the film is rewound, and after the rewinding is completed, the film is initially wound and rewound. The information setting means comprises the feeding means and the control means for operating the reading / decoding means to read and decode the information, wherein the information setting means uses the film information determined to be accurate as the information for controlling the photographing. A camera capable of inputting film information characterized by setting. 3. The control means also reads and decodes the information in synchronization with the film rewinding after the film feeding is stopped, and if the decoding success signal is output at the completion of the rewinding, the film initial winding is performed. 7. The feeding means and the reading / decoding means are controlled to perform the initial film winding, the information reading, and the decoding if the decoding success signal is not output when the rewinding is completed. A camera that can input the film information described in 2. 4. The control means also reads and decodes the information in synchronism with the rewinding of the film after the film feeding is stopped, and when the decoding success signal is output before the rewinding is completed, the control is accompanied. The camera capable of inputting film information according to claim 2, wherein the feeding means is operated to perform initial film winding.