JPH04180045A - Camera film information display device - Google Patents

Abstract

PURPOSE:To confirm whether a reloaded film is the one intended by a user or not by extracting the final photographing frame number corresponding to the reloaded film from memory and displaying related information. CONSTITUTION:When the halfway rewinding of the loaded film is commanded, the final frame number and photographing information recorded on the magnetic recording medium 12 of the frame are made to correspond, and stored by a storage means 103. When a halfway rewinding film is reloaded, whether it is the film having the halfway rewinding in the past or not is discriminated by a discriminating means 104, the final photographing frame number is detected by a detecting means 105, and the same frame number as the final photographing frame number detected out of the final photographing frame numbers stored in the memory is extracted by an extracting means 106. The photographing information corresponding to the extracted frame number is extracted, as well, and the final photographing frame number and the photographing information are displayed with a display means 107. Thus, whether the reloaded film is the one intended by the user or not, is confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a film information display device for a camera, and particularly to a device for displaying film information in a camera, and in particular, a device for displaying film information in a camera so that it can be determined whether or not the film is the one intended by the photographer when rewinding film in the middle of loading. related to what was done.

B. Conventional technology For example, when the shooting conditions change significantly, the film that has been shot halfway is rewound (this film is called rewound film), and then a film with a different sensitivity is loaded and the shot is taken. After that, the original partially rewound film may be reloaded and photographed. In such a case, when rewinding the film and reloading the film, it is necessary to wind the film to a position where the next unexposed frame after the last photographed frame faces the aperture.

Therefore, the present applicant has previously proposed a photographed information recording device for a camera that records photographed information of each photographed frame at an information recording position set at the front end or rear end of the photographed frame (Japanese Patent Application No. 181976/1999). (in writing). According to this, when reloading a partially rewound film, the information on the recording position is read while winding the film, and the winding is stopped when a frame for which the photographed information is not recorded is detected. It becomes possible to make the unexposed frame face the aperture.

C6 Problems to be Solved by the Invention However, with the above-mentioned conventional device, when a user has multiple partially rewound films, it is not possible to confirm whether the reloaded film is the one that the user intended. There was a risk of shooting with an unintended film.

SUMMARY OF THE INVENTION An object of the present invention is to provide a film information display device for a camera that allows the user to confirm whether or not the reloaded film is the one that was intended for the user.

01 Means for Solving the Problems To explain with reference to FIG. 1, which is a diagram corresponding to the claims, the film information display device for a camera according to the present invention includes a command means 101 for commanding rewinding of the loaded film halfway;
A rewinding means 102 that rewinds the film midway based on the above command, and when rewinding the film midway is commanded, associates the frame number of the last photographed frame of the film with information related to the film. storage means 10 for storing
3, a determining means 104 for determining whether or not the loaded film has been partially rewound in the past; and if it is determined that the loaded film is a partially rewound film, detecting the last photographed frame number of the film; Detection means 105 and storage means 1
extracts the same frame number as the last photographed frame number detected by the detection means 105 from the last photographed frame number stored in 03, and extracts the film-related information stored corresponding to the extracted frame number. The above-mentioned problem is solved by comprising an extracting means 106 and a display means 107 for displaying both the last photographed frame number and film-related information extracted by the extracting means 106.

E1 action When a command is given to rewind the loaded film midway, the storage means 103 stores the frame number of the last photographed frame of the film, and
Information related to the film is stored in association with the information.

On the other hand, when a film is loaded, the first determining means 104 determines whether or not the film has been partially rewound in the past. If it is determined that the film is a partially rewound film, the detection means 105 detects the last photographed frame number of the film. The extraction means 106 is the storage means 103.
The same frame number as the last photographed frame number detected by the detecting means 105 is extracted from the last photographed frame number stored in the frame number, and the film-related information stored corresponding to the extracted frame number is extracted. These last photographed frame numbers and film related information are displayed on the display means 107.

Thereby, the user can judge whether or not the currently loaded film is the film he/she intends by looking at the displayed film-related information.

F. Example An embodiment of the present invention will be described with reference to FIGS. 2 to 8.

FIG. 2 shows a film 1 loaded into the camera according to this embodiment.
0, 11 is an exposure area for one frame, and 12 is a magnetic recording medium provided corresponding to each exposure area 11. This magnetic recording medium 12 has a photographing information recording section 1 in the center.
2a and the photographed information recording section 1 provided at both ends thereof.
2b, and the photographing information recording section 12a magnetically stores photographing information such as the photographing date, the ISO sensitivity of the film 10, the name of the photographer, the photographing location, and the type of subject (for example, a landscape photograph or a portrait). recorded. Furthermore, photographed information, which will be described later, is recorded in the photographed information recording section 12b. This photographic information corresponds to film-related information.

FIG. 3 is a block diagram showing a film information display device for a camera according to the present invention. A recording circuit 2 and a reproducing circuit 3 are connected to a control circuit 1 that controls the sequence of the entire camera, and an m% head 4 is connected to both circuits 2 and 3. The recording circuit 2 is.

When the film is fed, the magnetic head 4 is brought into contact with the magnetic recording medium 12 of the film 10, and predetermined information is magnetically recorded thereon. The reproducing circuit 3 similarly reproduces the information recorded on the magnetic recording medium 12 by the magnetic head 4 and inputs it to the control circuit 1.

Further, a display circuit 5 and a motor drive circuit 6 are connected to the control circuit 1. The display circuit 5 displays various information on a liquid crystal display device (FIG. 4) provided on the surface of the camera body in response to display signals from the control circuit 1. A film feeding motor 8 is connected to the motor driving circuit 6, and the film 10 is moved by the motor 8 in response to a command from the control circuit 1.
will be delivered. That is, the film 10 is wound up by the forward rotation of the motor 8, and rewound by the reverse rotation.

Furthermore, the control circuit 1 includes a half-press switch SWI.

Release switch SW2. A rewind switch SW3 and a back cover opening/closing switch SW4 are connected.

Half-press switch SWI and release switch SW2 are switches that are turned on in conjunction with the operation of a release button (not shown). Half-press the release button turns on switch SWI, and full-press operation (release operation) turns switch SW2 on.
turns on. The rewind switch SW3 is turned on in conjunction with the operation of a rewind button (not shown), and the film is rewound in response to turning on of the switch SW3. Here, in this embodiment, when the exposure of the last frame of the film 10 is completed, the rewind is automatically performed, and therefore the rewind button is operated when rewinding the film halfway. It is something. Further, the back cover switch SW4 is turned off when the camera back cover is closed, and turned on when the camera back cover is closed.

Next, the control procedure by the control circuit 1 will be explained based on the flowcharts of FIGS. 5 to 8.

FIG. 5 shows processing during photographing, and this program is started, for example, when a power switch (not shown) is turned on. In step S1, it is determined whether the half-press switch SW1 is turned on, and if it is not turned on, it is determined in step S2 whether the rewind switch SW3 is turned on. If the rewind switch SW3 is not on, the process returns to step S1. When it is determined in step S1 that the half-press switch SWI is on, the process proceeds to step S3, where a photometering circuit and a distance measuring circuit (not shown) are driven to perform distance measurement and photometry, and then step S
In step 4, the process waits until the release switch SW2 is turned on.

When the release switch SW2 is turned on, exposure (photography) is performed in step S5 based on the distance measurement and photometry results, and then, in step S6, the film feed motor 8 is rotated forward by the motor drive circuit 6 to film the film. 1
Start winding up the pieces. In step S7, information is recorded. That is, the magnetic head 4 is brought into contact with the magnetic recording medium 12 of the film 10 via the recording circuit 2, and as the photographed information recording section 12b slides on the magnetic head 4 as the film is wound, photographed information is recorded. do. Furthermore, when the photographic information recording section 12a slides on the magnetic head 4,
Photographing information for the frame photographed in step S5 is recorded.

As described above, the photographing information to be recorded indicates, for example, the photographing date, ISO sensitivity, photographer's name, photographing location, type of subject, etc., and one or more of these can be recorded. Here, the shooting date may be recorded using information from a date mechanism (not shown), the ISO sensitivity of the film 10 may be recorded using information from the DX coat of the cartridge, and the photographer's name, shooting location, and type of subject may be recorded using other information. It is sufficient to use information manually inputted into the camera by the photographer.

Next, in step S8, it is determined whether or not the film 10 has been wound by one frame. If it is affirmative, the process returns to step S1 and the above-described process is repeated.

On the other hand, when it is determined in step S2 that the rewind switch SW3 is on (when rewinding is commanded midway), step S
At 9, the motor 8 is reversely rotated via the motor drive circuit 6, and rewinding of the film 10 is started. And step S10
When it is determined that rewinding is complete, the process advances to step Sll, where the frame number (stored with information from a film counter (not shown)) of the last photographed frame (last photographed frame) of the film 10 and information regarding that frame are stored. Shooting information (step S7
(recorded in ) are associated with and stored in the built-in memory. After that, the process returns to step S1. Here, information storage in step Sll is sequentially recorded in different areas of the memory each time the film is rewound midway,
Therefore, the memory stores information for the number of films. Note that information storage may be performed immediately after turning on the rewind switch SW3.

6 to 8 show processing when loading the film 10.

In FIG. 6, when the film 10 is loaded into the camera and the back cover is closed, the back cover opening/closing switch SW4 is turned on, step S21 is affirmed, and step S22 is where the film 10 is loaded and the back cover is closed.
It is detected whether 0 is a film for which all frames have been photographed, a partially rewound film, or a new film (not a single frame has been photographed).

For example, information that a rewind was performed midway or that a rewind was performed after all frames were shot is recorded in a designated recording area of the cartridge, and the recorded contents are read when the film is loaded. You can judge by. Specifically, as shown in Japanese Patent Application No. 2-30508 filed by Mizuyoshi, the usage state of the film may be detected by a camera controlling the stop position of the film spool.

Alternatively, by actually winding the film 10 and reading the information in the photographed information recording section 12b, if the photographed information is recorded up to the last frame, it is determined that all frames have been photographed, and the photographed information is recorded up to the intermediate frames. If the film is partially rewound, it may be determined that the film is partially rewound, and if the photographed information is not recorded in the first frame, it may be determined that the film is new.

As a result of the above inspection, if it is determined in step S23 that the film 10 is a film in which all frames have been photographed, step S23 is performed.
Step S24 displays the mark rFJ (see FIG. 4) indicating that all frames have been photographed on the liquid crystal display @7 via the display circuit 5, and the release is locked in step S25 to prohibit photographing. Return to processing. In this way, double exposure can be prevented by the camera identifying and displaying the usage status or locking the release. It is also conceivable to prevent a film in which all frames have been photographed from being loaded into the camera, but even in this case, the above-mentioned display and release lock are effective as a double measure.

If step S23 is negative, it is determined in step S26 whether or not the film 10 is new, and if affirmative, step S
At step S27, a mark "N" indicating a new film 1o is displayed, and at step S28, the motor 8 is rotated in the normal direction to perform initial film feeding, thereby making it ready for photographing. Thereafter, when it is determined in step S29 that the first photographing operation has been performed, the display mark is changed from "rN" to "P".

Here, this transition state may be stored in the control circuit 1 by a flag, and the above-mentioned use state identification may be performed in accordance with the flag when taking out the film from the camera.

On the other hand, if step S26 is negative, that is, if it is determined that the loaded film 10 is a partially rewound film, the process proceeds to step S31, where a mark "P" indicating the partially rewound film 10 is displayed, and , in step S32, the film feeding motor 8 is started to rotate normally. Next, in step S33, the photographed information recording section 12b
The information is played back. That is, the magnetic head 4 is brought into contact with the magnetic recording medium 12 of the film 10 via the reproducing circuit 2, and as the film is wound, the photographed information recording section 12b is
reads the information when it slides on the magnetic head 4.

In step S34, it is determined from the read information whether or not the information has been photographed, and in step S35, the number of frames is counted by a film counter. Step 53
In step S6, it is determined whether or not the frame is an unexposed frame as a result of the identification in step S34. That is, if the read information is photographed information, it is determined that the frame has been photographed, and the process returns to step S33.
Judging from the photographed information that the frame is unexposed, proceed to step S.
Proceed to step 37. In step S37, the motor 8 is stopped. As a result, the unexposed frame next to the last photographed frame faces the aperture. The value obtained by subtracting 1 from the count value of the film counter at this time corresponds to the frame number of the final photographed frame. Note that the method for detecting photographed frames is not limited to the above method.

Next, the process advances to step S38 in FIG. 7, where the final photographic frame number is extracted. That is, step Sll in FIG.
The last photographed frame number that is the same as the last photographed frame number of the currently loaded film is extracted from among the final photographed frame numbers stored in .

As a result of the extraction, if it is determined in step S39 that there is the same piece number, then in step S40 the same piece number is
Determine whether there are more than one. If there is only one identical item, the normal display mode is set in step S41,
If there are two or more, sequential display modes are set in step S42, and the process advances to step S43.

In step S43, shooting information (film related information) stored in the memory corresponding to the extracted frame number is
Extract. In step 5-14, a display signal is output to the display circuit 5 to cause the liquid crystal display device 7 to display the extracted final photographic frame number and corresponding photographic information. In other words, in the case of normal display mode, the extracted 1
In the case of sequential display modes 1 to 1, a plurality of pieces of information are displayed repeatedly at predetermined time intervals.

In step S45, it is determined whether or not the half-press switch SW1 has been turned on. If not, in step S46, it is determined whether or not the rewind switch SW3 has been turned on.

If the rewind switch SW3 is not on, step S43
Return to and repeat the above process.

If it is determined in step S45 that the half-press switch SWI is on, the process advances to step S1 in FIG. 5, and the normal photographing mode is entered. This operation is the result of the user checking the displayed content and determining that the film is the one he/she intended. At this time, the display also returns to the normal mote. That is, for example, if the shooting date of the last frame is displayed as a date display, this returns to the current date. In addition,
If the memory contents are specified by turning on the half-press switch SWI, the information regarding the currently loaded film is
When this film is taken out, the previous data is erased and stored in the same storage area.

Further, when it is determined in step S46 that the rewind switch SW3 is on, rewinding of the film is started in step S47. When it is determined in step 848 that rewinding is complete, the process returns to a predetermined process.

This is an operation performed when the user checks the display and the film is not the desired film, and in this case also the display returns to its original state.

On the other hand, if it is determined in step S39 that there is no one among the stored last photographed frame numbers that is the same as the last photographed frame number of the currently loaded film, the process advances to step S49 in FIG. A warning is displayed on the liquid crystal display device 7 to the effect that there is no identical piece number. This can be done by, for example, making the display mark "P" blink. Next, in step S50, the state of the half-press switch SWl is determined. If it is on, the process proceeds to step S1 in FIG. 5, and if it is off, the state of the rewind switch SW3 is determined in step S5'l. The fact that the half-press switch SW1 is turned on in this state indicates that the user has acknowledged the use of the film, even if the film has no recording. In this case, the blinking of "P" is stopped.

If the rewind switch SW3 is not on, step S49
If it is on, rewinding of the film 10 is started in step S52. When it is determined in step S53 that rewinding is complete, the process returns to a predetermined process.

The above steps of FIGS. 5 to 8 are summarized below.

When rewinding the loaded film 10 is commanded by the rewind switch SW3, the film 10 is rewinded midway, and the frame number of the last photographed frame of the film 10 and the magnetic recording medium of that frame] The photographing information (film-related information) recorded in 2 is stored in the camera memory in association with each other (FIG. 5).

Assume that the user currently has a plurality of such partially rewound films and does not know what type of film he is about to load. If any one of the films 10 is loaded into the camera in this situation, the loaded film 10 will be a film 10 that has been partially rewound in the past.
It is determined whether or not the film 10 is partially rewound, and if the film 10 is partially rewound, the last photographed frame number of the film 10 is detected.

First, a frame number that is the same as the detected last frame number (the last frame number of the loaded film) is extracted from among the last frame numbers stored in the memory of the camera. Next, the photographing information stored corresponding to the extracted frame number is also extracted, and the extracted final photographing frame number and photographing information are displayed together.

Here, since the last photographed frame numbers are the same, there is a high possibility that the extracted and displayed photographing information is information about the loaded filter t. You can determine whether the currently loaded film is the one you intended. and,
If it is determined that the film is the intended film, the release button is pressed halfway to become ready for shooting.

Furthermore, if it is determined that the film is not the intended film, the film will be rewound by operating the rewind button.

Furthermore, if there are a plurality of last photographed frame numbers stored in the memory that are the same as the last photographed frame number of the loaded film, the photographing information for all of them is displayed.

If the user looks at the information and determines that the loaded film is not the intended film, he or she can rewind the film in the same manner as described above. On the other hand, if the displayed plural pieces of photographic information include information regarding the intended film, there is a high possibility that the loaded film is the intended film.

Furthermore, if there is no frame number that is the same as the last photographed frame number of the loaded film among the last photographed frame numbers stored in the memory, a warning to that effect is issued. This indicates, for example, that the loaded film was shot with another camera.

In the configuration of the above embodiment, the rewind switch SW3 functions as the command means 101, the motor control circuit 6 and the motor 8 function as the rewind means 102, and the control circuit 1 functions as the storage means 1o32 discriminating means 104. The detection means IO5 and the extraction means 106 constitute the display means 107, and the display circuit 5 and the liquid crystal display device 7 constitute the display means 107, respectively.

In the above description, the information recording medium records photographing information and photographed information, but the present invention can also be applied to media that do not record or reproduce information on these films. In this case, for example, the final frame number of the partially rewound film can be detected by magnetically or electrically recording the number on the film cartridge and reading that information when reloading the film.

Furthermore, in the above, the frame number that is the same as the last frame number of the loaded film is extracted from among the last frame numbers stored in the memory, but for example, film sensitivity information may be added to this last frame number. By displaying the same final photographic frame number and film sensitivity information, it is possible to further limit the number of films. or,
It may also be possible to limit the number of frames using film sensitivity information only when there are a plurality of identical frame numbers. Furthermore, this added information is not limited to film sensitivity information. Furthermore, the configuration and display form of the display means are not limited to the embodiments.

G1 Effects of the Invention According to the present invention, when a command is given to rewind a film midway, the frame number of the last photographed frame of the film and information related to the film are stored in association with each other,
When a partially rewound film is reloaded, the same frame number as the last photographed frame number of the loaded film is extracted from the last photographed frame number stored above, and the frame number corresponding to the extracted frame number is extracted. Since the stored film-related information is extracted and displayed, even if the user has multiple rolls of film in their possession, it is easy to check whether the reloaded film is the one that the user intended. This makes it possible to confirm the situation and prevent inconveniences such as shooting with an unintended film.

[Brief explanation of the drawing]

FIG. 1 is a complaint correspondence diagram. Figures 2 to 8 show an embodiment of the present invention.
The figure shows a display example of a liquid crystal display device, and FIGS. 5 to 8 are flowcharts of the processing procedure. 1: Control circuit 2: Recording circuit 3: Reproducing circuit 4: Magnetic head 5: Display circuit 6: Motor motion circuit 7: Liquid crystal display device 8: Film feeding motor 101: Command means
102: Rewinding means 103: Storage means 104: Discrimination means 105: Detection means 106 Extraction means 10: Display means SW3: i rewind switch Patent applicant Nikon Co., Ltd. Representative patent attorney Fuyu Nagai Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] Command means for commanding rewinding of a loaded film midway; rewinding means for rewinding the film midway based on the command; and when rewinding the film midway is commanded. a storage means for storing the frame number of the last photographed frame of the film in association with information related to the film; and a determination means for determining whether the loaded film is a film that has been partially rewound in the past. and detecting means for detecting the last photographed frame number of the film when it is determined that the film is a partially rewound film; Extracting means for extracting the same frame number as the photographed frame number, and extracting the film-related information stored in correspondence with the extracted frame number; and the last photographed frame number and film extracted by the extracting means. 1. A film information display device for a camera, comprising display means for displaying related information together.