JPH1184494A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a camera capable of making a quick exchange for an intended film and shortening the standby time until photographing can be started by immediately stopping it on the way of feeding the unexposed first frame up to the aperture position of the camera, with the operation of an operating member, so as to rewind a film. SOLUTION: When a photographer realizes that a film cartridge different from one intended by him or her is loaded and turns on a halfway rewinding switch 17, regardless of the process of executing drive for the function (MRC) of automatically feeding the film, the MRC drive is immediately stopped. In other words, when it is discriminated that the halfway rewinding switch 17 is tuned on during the MRC drive, a film feeding motor is stopped by a film feeding drive circuit 5. Thus, even if the MRC drive is in execution, the MRC drive is forcibly stopped and in the next step, the reading of magnetic data by a magnetic recording circuit 3 and a magnetic head 2 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a function of feeding an unexposed top frame to an aperture position of a camera when it is detected that a film rewound during shooting is reloaded. It is about improvement.

[0002]

2. Description of the Related Art In recent years, many cameras have been proposed which enable recording of photographing information such as shutter time and aperture value by using a magnetic head on a magnetic recording unit provided on a fed film. . Further, in the cameras of the above proposals and the like, the magnetic information stored in the film is read by a magnetic head provided in the camera, so that even if the film taken out by rewinding spontaneously during shooting is reloaded, the exposure It has been proposed to discriminate whether an exposed frame or an unexposed frame and automatically feed the film to the leading position of the unexposed frame (hereinafter, this function is referred to as MRC) (US Pat. No. 486).
No. 4332).

[0003]

However, in a camera having an MRC function as in the above-mentioned conventional example, when the film taken out during photographing is reloaded, the MRC mechanism always operates. Even if you load an unintended film and immediately try to change to the intended film when you notice this, you cannot wait for the MRC operation to complete before you can perform the rewinding operation. There was a problem that missed.

(Object of the Invention) An object of the present invention is to provide a camera capable of promptly changing the film to an intended film, shortening the time required for taking a picture, and reducing missed shutter chances. It is intended to provide.

[0005]

In order to achieve the above object, according to the present invention, there is provided a film cartridge, comprising: a display unit for displaying a use state of a film provided in the film cartridge; A film use state detecting means for detecting the use state of the film in the camera, and when the film use state detection means detects that the film rewound during the photographing is reloaded, the unexposed top frame of the camera is detected. An operation member for stopping the operation of feeding the unexposed top frame to the aperture position of the camera, wherein the camera has head frame indexing means for feeding to the aperture position; The operation is immediately stopped by operating the operation member while the operation of feeding the top frame to the aperture position of the camera is being performed. It is intended to a camera having a first frame indexing canceling means for causing the unwinding of the film.

According to another aspect of the present invention, there is provided a film cartridge, comprising: a display unit for displaying a use state of a film provided in the film cartridge; The film use state detecting means for detecting the use state of the camera, and when the film use state detection means detects that the film rewound during the shooting is reloaded, the unexposed first frame is moved to the aperture position of the camera. An operation member for stopping an operation of feeding the unexposed top frame to an aperture position of the camera in a camera having a leading frame indexing means for feeding and a display means for displaying read film information; By starting the operation of feeding the unexposed top frame to the aperture position of the camera by the top frame indexing means, the display means is displayed. Display control means for displaying film information; and operating the operating member when the film information is displayed on the display means, thereby immediately stopping the operation by the leading frame indexing means, and winding the film. The camera is provided with a leading frame index canceling means for returning.

According to another aspect of the present invention, a display means for displaying the use state of a film provided in a film cartridge displays the use state of the film in the film cartridge. A film use state detecting means for detecting, and a head for feeding the unexposed top frame to the aperture position of the camera when the film use state detection means detects that the film rewound during the shooting is reloaded. In a camera having a frame indexing means and a display means for displaying film information, an operation member for stopping an operation of feeding the unexposed leading frame to an aperture position of the camera, and a mode for confirming the film information Mode setting means for setting the film information, and when the mode for checking the film information is set by the mode setting means, Display control means for displaying the film information on the display means, and when the film information is displayed on the display means, operation of the head frame indexing means is immediately stopped by operating the operation member. And
The camera has a leading frame index canceling means for rewinding the film.

In the above-described configuration, for example, while the operation of feeding the unexposed top frame to the aperture position of the camera is detected while detecting that the film that has been rewound during photographing has been reloaded, for example, a display is displayed. When the operation member is operated by the photographer who notices that the loaded film is unintended from the film information that has been loaded, the unexposed top frame is fed to the aperture position of the camera. The operation is immediately stopped and the film is rewound.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a block diagram showing an electric configuration of a camera according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a control unit including a microcomputer for controlling the entire camera. Reference numeral 2 denotes a magnetic head that writes and reads information to and from a magnetic recording unit provided on the film. Reference numeral 3 denotes a magnetic recording circuit that controls the magnetic head 2. Reference numeral 4 denotes a position at which the magnetic head 2 contacts the film. A head advancing / retracting drive circuit for advancing / retreating to a position retracted from the film surface, 5 a film feeding / driving circuit for driving a feeding motor (not shown) for winding and rewinding the film, 6 a photometry circuit, 7 a distance measurement Circuit, 8 a shutter control circuit, 9 an aperture control circuit, 10 a perforation detection for counting the perforations of the film by a photo reflector or the like. It is a circuit. Reference numeral 11 denotes a film use state identification circuit for detecting whether all frames have been photographed, whether only some frames have been photographed, or all frames have not been exposed. 12 is a camera aperture, shutter speed, film sensitivity, number of films,
A display unit for displaying various warnings and the like.

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 cartridge detection 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 a device for rewinding a film filmed halfway. A rewind switch on the way. Reference numeral 18 denotes a film use state display switching drive circuit for activating a switching means for switching the display of the film use state display means provided in the film cartridge. 19 is a shooting mode such as manual, shutter priority, aperture priority, program, etc., and setting of film sensitivity (ISO), date, etc.
A mode setting member that can set a mode for checking film information.

FIG. 2 is a top view of a film cartridge known from US Pat. No. 4,947,197, wherein reference numeral 20 denotes a film cartridge, and 21 denotes a film cartridge.
A fork engaging portion which is integrally formed with a film spool in the camera and which can push out and rewind the film by engaging a fork of the camera. 22 is index 2
2 is an index ring including 2a.

The fork engaging portion 21 and the index ring 2
Numerals 2 are configured to be independently rotatable with respect to the film cartridge 20. The index ring 22 is provided with a drive circuit 18 for switching the film use state display.
Is rotationally driven by a method known from US Pat. No. 1,965,600.

Reference numerals 23a, 23b, and 23c denote photoreflectors provided in the cartridge chamber of the camera body. Signals from the photoreflectors 23a to 23c are input to the film use state identification circuit 11 shown in FIG. Thus, the use state of the film can be identified.

FIG. 2A shows a state in which the film is not exposed to all frames (hereinafter, also referred to as UN).
2 shows a state in which only some frames have been photographed (hereinafter also referred to as PA), and FIG. 2C shows a state in which all frames have been exposed (hereinafter also referred to as EX).

FIG. 3 is a flow chart showing the operation from the loading of the film cartridge of the camera having the above configuration to the completion of the rewinding of the film. The operation will be described below in accordance with the flowchart.

In step # 101, it is determined from the state of the cartridge detection switch 15 whether or not the film cartridge is loaded in the cartridge chamber (not shown), and the cartridge detection switch 15 is turned on, that is, the film cartridge is loaded. When this is detected, the process proceeds to step # 102, where it is determined from the state of the back cover switch 16 whether or not the back cover (not shown) has been closed. When it is detected that the back cover is closed, the process proceeds to step # 103, where the film information such as the ISO, the number, and the type of the loaded film is read from the bar code information provided in the film cartridge, and described in FIG. It is determined whether the state of use of the film identified by the method is an EX (all frames have been shot) state, an UN (all frames have not been exposed) state, or a PA (only some frames have been shot) state. As a result, EX
If it is determined that the film is in the state, the process proceeds to step # 120, and the display unit 12 warns that all the frames have been exposed and cannot be used.

If it is determined that the vehicle is in the UN state,
The process proceeds from step # 103 to step # 117, in which the film feeding drive circuit 5 drives the film feeding motor (not shown) to start the automatic loading (AL). Then, in the next step # 118, the process waits until the AL is completed, and when the AL is completed, the process proceeds to step # 119.
The film feed drive circuit 5 stops the film feed motor.

If it is determined that the vehicle is in the PA state,
Proceeding from step # 103 to step # 104, the magnetic head 2 is brought into contact with the film surface by the head advance / retreat drive circuit 4. Then, in the next step # 105, the magnetic recording circuit 3 is driven by the magnetic recording circuit 3 to read data recorded in the magnetic recording section of the film. In the following step # 106, the film feed motor is driven by the film feed drive circuit 5, and the MRC drive is started. Then, in the next step # 107, M
It is detected whether or not the rewind switch 17 is turned on during the RC driving.
The program proceeds to step # 13, where it is determined whether or not the film has been fed to the leading position of the unexposed frame. If the film has not reached the leading position, the process returns to step # 107, and the same operation is repeated.

Thereafter, if it is determined in step 113 that the film has been fed to the leading position of the unexposed frame, it is determined in steps # 113 to #
Proceeding to 114, the film feed drive circuit 5 stops the film feed motor. Then, in the next step # 115, the reading of the magnetic data by the magnetic recording circuit 3 and the magnetic head 2 is stopped, and the following step # 1
At 16, the magnetic head 2 is retracted from the film surface by the head advance / retreat drive circuit 4.

If it is determined in step # 107 that the midway rewind switch 17 has been turned on during MRC driving, the process proceeds from step # 107 to step # 108 as described above, and the film feed driving circuit 5 To stop the film feeding motor. That is, even if the MRC driving is in progress, the MRC driving is forcibly stopped. Then, in the next step # 109, the magnetic recording circuit 3
Then, the magnetic data reading by the magnetic head 2 is stopped.

In the next step # 110, the film feeding drive circuit 5 drives the film feeding motor to start rewinding the film. Then, in step # 111, it is determined whether or not the entire film has been wound into the film cartridge and rewinding has been completed.
When the rewinding is completed, the process proceeds to step # 112, where the driving of the film feeding motor is stopped by the film feeding driving circuit 5, and the rewinding drive of the film is stopped.

According to the first embodiment, the MRC
Even if the photographer notices that a film cartridge different from the intended film cartridge has been loaded and turns on the midway rewind switch 17 even during driving, the MRC drive is immediately stopped, and , The film can be exchanged quickly, the time required for taking a picture can be shortened, and the chance of missing a photo opportunity is reduced.

(Second Embodiment) FIG. 4 is a flowchart showing the operation of the main part of a camera according to a second embodiment of the present invention, and the operation will be described below in accordance with the flowchart.

The configuration of the camera according to the second embodiment is substantially the same as that of the camera according to the first embodiment.
The only difference is that the timing for receiving the midway rewind switch 17 is limited. Therefore, only the difference will be described here.

In FIG. 4, in step # 201, the film information read in step # 103 is displayed on the display unit 12 for a predetermined time. And the next step #
In step 202, it is determined whether or not the film information is being displayed. If the display is not being performed, the process immediately proceeds to step # 204. If the display is being performed, the process proceeds to step # 203. It is detected whether or not the halfway rewind switch 17 has been turned on. If the switch has not been turned on, the process proceeds to step # 204. If the switch has been turned on, the process proceeds to the operation from step # 108 described above.

In step # 204, as in step # 113, it is determined whether the film has been fed to the head of the unexposed frame.
02, and the same operation is repeated thereafter. If the film has been fed to the head of the unexposed frame, step # 1 is executed.
The operation shifts to the operation after 14.

According to the second embodiment, the MRC
Since the film information is displayed for a predetermined time after the start of the driving, the ISO, the number, and the type of the film loaded by the photographer can be checked.
7, the film rewind is not performed even if the rewind switch is inadvertently pressed when the film information is not being displayed. Therefore, the film (cartridge) can be exchanged quickly, and the photographing can be prepared in a short standby time, so that missed shutter chances can be drastically reduced.

(Third Embodiment) FIG. 5 is a flowchart showing an operation of a main part of a camera according to a third embodiment of the present invention, and the operation will be described in accordance with the flowchart.

The configuration of the camera according to the third embodiment is substantially the same as that of the camera according to the first embodiment.
Here, only the difference will be described.

In FIG. 5, in step # 301, it is determined whether or not the film information confirmation mode has been set by the mode setting member 19, and if not, the process immediately proceeds to step # 304. For example, the process proceeds to step # 302, where the above-described step
For example, the film information read at 103 is displayed on the display unit 12 for a predetermined time (or while the mode setting member 19 is set to the film information confirmation mode). Then, in the next step # 303, similarly to the above-mentioned step # 107, it is detected whether or not the halfway rewind switch 17 has been turned on during the MRC driving, and if not turned on, the process proceeds to step # 304. When the rewind switch is turned on, the operation shifts to the operation after step # 108 described above.

In step # 304, as in step # 113, it is determined whether the film has been fed to the leading position of the unexposed frame. If not, the process returns to step # 301, and the same operation is repeated. . If the film has been fed to the head of the unexposed frame, the operation shifts to the operation after step # 114.

According to the third embodiment, the MRC
After the start of driving, a restriction is added to accept the midway rewind switch 17 only when set to the film information confirmation mode provided for confirming the film information. Even if the rewind switch 17 is inadvertently pressed, the film is not rewound. Therefore,
Films (cartridges) can be quickly exchanged, and photographing can be prepared in a short standby time, so that missed shutter chances can be drastically reduced.

(Correspondence between the Invention and the Embodiment) In each of the above embodiments, the midway rewind switch 17 corresponds to the operating member of the present invention, the display section 12 corresponds to the display means of the present invention, and the mode setting member. 19 corresponds to the mode setting means of the present invention. Step # 107 in FIG.
108, and step # 202 in FIG.
The part for performing the operation of 203 → 108 and the step # in FIG.
The part performing the operations of 301 → 302 → 303 → 108 corresponds to the leading frame index canceling means of the present invention.

The correspondence between the components of the embodiment and the components of the present invention has been described above. However, the present invention is not limited to the configuration of the embodiment, and the functions and features described in the claims are not limited.
Needless to say, any configuration may be used as long as the functions of the embodiment can be achieved.

(Modification) In each of the above embodiments,
Although a camera using a magnetically recordable film is taken as an example, it is not necessarily limited to this. When the film is rewound in the middle of shooting, for example, the number of shot frames is optically recorded on the film, and when the film is reloaded, the number of shot frames stored optically is stored. Can be similarly applied to a camera having a configuration in which is read from a film and the leading position of an unexposed frame is determined.
Further, when the film is rewound during the shooting, the ID of the film and the number of frames to be shot are recorded in the RAM or the like of the camera in association with each other, and when the film is reloaded, The present invention can be similarly applied to a camera configured to read the ID of the film and the number of photographed frames in the RAM corresponding to the film ID and determine the leading position of the unexposed frame.

The midway rewind switch 17 is set to MRC.
The switch is also used as a switch for stopping driving, but is not necessarily limited to this, and may be used as another switch or a dedicated switch.

The present invention relates to a cartridge having a type other than the cartridge described in the above embodiment, a cartridge having an image recording medium other than a film, and other types of cartridges or loaded or discharged materials other than cartridges such as batteries. However, it is applicable.

The present invention may have a configuration in which the above-described embodiments or their techniques are appropriately combined.

The present invention is also applicable to various types of cameras such as a single-lens reflex camera, a lens shutter camera, and a video camera.
Further, the present invention can be applied to optical devices other than cameras and other devices.

The film may be fed one frame by winding or by rewinding.

[0042]

As described above, according to the present invention,
Detecting that the film that has been rewound during shooting is reloaded, and starting the operation of feeding the unexposed top frame to the aperture position of the camera, for example, from the displayed film information, When the operation member is operated by the photographer who notices that the loaded film is unintended, the operation of feeding the unexposed top frame to the aperture position of the camera is immediately stopped, and the film is stopped. Since the rewinding is performed, it is possible to provide a camera capable of promptly changing the film to an intended film, shortening the time required for taking a picture, and reducing missed shutter chances. Things.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an electrical configuration of a camera according to each embodiment of the present invention.

FIG. 2 is a diagram for explaining a state when detecting a film use state of a film cartridge loaded in a camera according to each embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of a main part of the camera according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of a main part of a camera according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of a main part of a camera according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control part 2 Magnetic head 3 Magnetic recording circuit 4 Head advance / retreat drive circuit 5 Film feed drive circuit 11 Film use state identification circuit 17 Halfway rewind switch 19 Mode setting member

Claims (6)

[Claims] 1. A film use state detecting means for detecting a use state of a film in a film cartridge provided by a display means for displaying a use state of a film provided in a film cartridge, and a photographing process being performed by the film use state detection means. When detecting that the rewinded film has been reloaded in the camera, the unexposed top frame is fed to the aperture position of the camera. An operation member for stopping the operation of feeding to the aperture position, and an operation member for feeding the unexposed leading frame to the aperture position of the camera by the leading frame indexing means. It has a head frame index canceling means for immediately stopping the above-mentioned operation by being operated and rewinding the film. Camera to be. 2. A film use state detecting means for detecting the use state of the film in the film cartridge, and a display means for displaying the use state of the film provided in the film cartridge, and a photographing operation by the film use state detection means. When it is detected that the film rewound in step (1) has been reloaded, a leading frame indexing means for feeding an unexposed leading frame to an aperture position of the camera and a display means for displaying read film information are provided. An operation member for stopping an operation of feeding the unexposed top frame to the aperture position of the camera, and an operation of feeding the unexposed top frame to the aperture position of the camera by the top frame indexing means. By being started, display control means for displaying film information on the display means, and film information on the display means When shown, the operation member is operated to immediately stop the operation of the leading frame indexing means, and to have a leading frame index canceling means for rewinding the film. And the camera. 3. The display control means displays film information on the display means for a predetermined time when an operation of feeding the unexposed top frame to the aperture position of the camera by the top frame indexing means is started. The camera according to claim 2, wherein the camera is operated. 4. A film use state detecting means for detecting the use state of the film in the film cartridge by a display means for displaying a use state of the film provided in the film cartridge, and a photographing process by the film use state detection means. When it is detected that the film rewound in step 1 has been reloaded, the camera has a leading frame indexing means for feeding an unexposed leading frame to the aperture position of the camera, and a display means for displaying film information. An operation member for stopping the operation of feeding the unexposed top frame to the aperture position of the camera, mode setting means for setting a mode for checking film information, and checking the film information by the mode setting means When a mode is set, display control means for displaying the read film information on the display means, When the film information is displayed on the display means, when the operation member is operated, the operation by the leading frame indexing means is immediately stopped, and the leading frame index canceling means for rewinding the film is performed. And a camera. 5. The operation member according to claim 1, wherein the operation member is an operation member for instructing rewinding on the way.
The described camera. 6. The apparatus according to claim 1, wherein said first frame determining means determines whether or not magnetic information is recorded in a magnetic recording section of each frame of the film to determine a leading position of an unexposed frame. The camera according to 1, 2, or 4.