JP2002350940A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera from which a film can safely be taken out without damaging the film and the camera itself even if the back cover of the camera is opened and closed near the final frame of the film. SOLUTION: This camera is provided with a loading means for loading the film in a winding up direction or a rewinding direction (5. 6), an opening and closing state detecting means to detect the opening and closing state of the back cover (1. 4), a means to perform a loading operation to load the film by a prescribed amount in the winding up direction by means of the loading means according to the closed state of the back cover (1. 5. 6), a loading state detecting means to detect the loading state of the film during a loading operation (1. 7), and a control means to control the loading means so as to perform the loading operation in the film rewinding direction if the loading state of the film is detected when the back cover is opened after the feeding operation, and not to perform the loading operation in the rewinding direction if the loading state of the film is not detected (1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a feed control system for a camera using a silver halide film.

[0002]

2. Description of the Related Art In a conventional camera using a silver halide film, when a film is taken out during shooting due to a trouble in the course of feeding, the film is taken out because a gear of a feeding system is engaged in a winding direction. The load in the direction was heavy, and forcible removal could damage the film or the feed gear.

In order to improve this point, when the back cover is opened to take out the film, the power is slightly applied in the rewinding direction, thereby disengaging the gear in the winding direction, and the film in the film taking-out direction is released. There was a camera that reduced the load and prevented damage to film and gear.

[0004] However, if the current in the rewind direction is unconditionally supplied when the back cover is opened, the rewind current is always supplied when the back cover is opened when no film is loaded. Also,
When loading the film and autoloading with a small amount of leader pulled out, the film cannot be wound up and autoloading fails.However, in this state, if the back cover is opened and autoloading is repeated, rewinding is performed. There is also a problem that the leader unit is entangled in the film cartridge due to energization, so that the film cannot be used even though no image has been taken.

In order to solve such a problem, the energization in the rewinding direction when the back cover is opened is performed only when the film counter is 1 or more, and when the film is not loaded or the auto loading fails. Some cameras do not perform the rewinding operation in the back cover opening operation.

[0006]

However, the conventional camera in which the rewind direction is energized when the back cover is opened only when the film counter is 1 or more has the following problems.

That is, if the film has been wound up to the vicinity of the final frame number and the camera back lid is accidentally changed from the open state to the closed state, the camera will suffer a strut phenomenon during auto loading. , The autoloading operation fails. At this time, since the auto-loading operation is not completed even if the camera back cover is opened, the film counter is set to "0", so that the rewinding is not energized.

Therefore, the engagement of the feeding gear is not released,
Unable to remove film. If the film is forcibly taken out, the film or the feeding gear may be damaged.

(Object) It is an object of the present invention to solve the above-mentioned problems and to take out a film safely without damaging the film or the camera itself even when the back cover is opened and closed near the end of the film. It is to provide a camera that makes it possible.

[0010]

According to the present invention, there is provided a camera comprising: a feeding means for feeding a film in a winding direction or a rewinding direction; and an open / close state for detecting an open / close state of a back cover. Detecting means, automatic loading means for performing a feeding operation for feeding a predetermined amount of film in the winding direction by the feeding means in response to the back lid being closed by the open / closed state detecting means, and feeding by the auto loading means. Feeding state detecting means for detecting a feeding state of the film during the feeding operation, if the feeding state detecting means detects the feeding state of the film when the back cover is opened after the feeding operation, For example, while the feeding operation in the film rewinding direction is performed, if the feeding state detecting unit does not detect the film feeding state, the feeding operation in the rewinding direction is performed. As no control means for controlling the feeding means, and has a city.

In the above configuration, in the case of a normal auto-loading mistake, the feeding state of the film is not detected, so that the energization in the rewinding direction is not performed even when the back cover is opened. In addition, when the back cover is opened and closed near the last frame of the film, the feeding state of the film is detected during the auto loading operation, so even if the auto loading fails, the back cover is opened when the back cover is opened. Since the energization in the rewinding direction of the spool is performed for a predetermined period, the film can be smoothly taken out.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the following drawings.

FIG. 1 is a block diagram for explaining a main configuration of a camera according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a sequence controller for controlling a camera sequence. Reference numeral 2 denotes a main switch (MAIN SW) for activating or deactivating the camera. Reference numeral 3 denotes a power supply circuit for supplying power required to drive the sequence controller and the camera circuit. 4 is a back cover switch for detecting whether the back cover is open. 5 is for winding and rewinding the film.
C motor drive circuit. Reference numeral 6 denotes a film feed motor. Reference numeral 7 denotes a perforation detection feed photoreflector for measuring the feed amount at the time of film winding and rewinding. Reference numeral 8 denotes an external LCD (liquid crystal) for displaying information such as a film counter.

FIG. 2 is a flowchart for explaining the operation of the portion related to the present invention in the sequence controller 1.

Next, the operation of this embodiment will be described with reference to FIG.

When the back cover of the camera is opened and closed, the back cover SW4
Thus, the sequence controller 1 detects a change in the state of the back cover. If "closed" is detected, the flow of the film auto-loading operation shown in FIG. In step S101, the sequence controller 1 controls the DC motor drive circuit 5 to drive the feed motor 6 to energize in the winding direction. Then, the film is fed out by the rotation of the motor, and the film is automatically wound on the spool side by a known auto-loading technique, whereby the film is wound up.

When the auto loading operation is started, the sequence proceeds to step S102. In S102, a change in the electric signal from the feed photoreflector 7 is detected. When the feed photoreflector 7 detects the movement of the film perforation, the electric signal changes. Therefore, when the electric signal from the feed photoreflector 7 changes and the movement of the perforation is detected, it is determined that the film is loaded, and the process proceeds to the next step S103.

The perforation signal changes because:
When the auto-loading operation is performed normally and the film is wound on the spool, or when the film is already loaded, the back lid is accidentally closed from the open state even though the back lid was opened. This is the case where the state is changed to the auto loading operation. When it is detected that the film has moved, a flag PR-Latch on the RAM of the sequence controller 1 is determined in step S102.
Is set to “1”. This flag is a flag for determining whether or not the film has moved during the automatic loading of the film. Then, the feeding motor 6 is driven in the winding direction as it is, and the process proceeds to the next step S105.

In step S105, it is detected whether or not the film has been fed by a predetermined amount by the feeding photo reflector 7. For example, when it is detected that 2.75 films have been wound, the process proceeds to the next step S106, and one frame is wound by the same operation as in normal shooting. That is, in the present embodiment, in the case of a normal auto-loading operation, 3.7.
Wind up 5 frames. If it is not detected in step S105 that 2.75 films have been wound, the process proceeds to step S107.

On the other hand, in step S102, if the signal of the feeding photoreflector 7 does not change, it is determined that the film is not loaded, or that the leader of the film does not wind well on the spool, and that the automatic loading operation has failed. Then, the process proceeds to step S104 to set the flag PR
-Set Latch to "0".

Then, the process proceeds to a step S107. Step S107 is a step of waiting for a back cover switch reception after the auto loading operation. In step S107,
If the back cover 4 detects that the back cover is "open", the process proceeds to step S108. In S108, the flag PR
-Determine whether Latch is 1 or not. P
If R-Latch is 1, the process proceeds to the next step S109.

During the automatic loading operation, the film feeding system is engaged with the film perforation in the winding direction. In order to remove the film wound around the spool, the spool must rotate in the rewinding direction. However, when the feeding system is engaged in the rewinding direction, the spool does not easily rotate in the rewinding direction. Therefore, it is difficult to take out the film, and if the film is forcibly taken out, the gears of the feeding system are broken, and the perforation of the film is cut, and the camera or the film is damaged.

In step S109, the film is fed in the film rewinding direction for a short period of time so that the film is easily taken out, and the spool is rotated in the reverse direction. As a result, the gears of the feeding system are disengaged, and the rotation of the spool becomes free, so that the film wound around the spool can be pulled out with a small force, and the film and the camera are not damaged without being damaged. Can be taken out.

In step S108, the PR-Latc
If h ≠ 1, it indicates that the auto-loading operation was performed in a state where no film is loaded, or that the film is not wound around the spool due to an insufficient amount of withdrawal of the leader unit. Become. In this state, since the film is not wound around the spool, it is not necessary to energize in the rewinding direction, and the sequence is terminated without energizing.

In step S107, the back cover switch 4
If does not change and remains "closed", the autoloading sequence ends.

In this embodiment, when an auto-loading error occurs, there is an effect that only when necessary, energization in the rewind direction for taking out the film is performed.

The present invention is not limited to this embodiment.

In this embodiment, the feed photoreflector is configured to detect the presence or absence of film feeding. However, instead of such optical means, a feeding unit is provided so as to contact the film. Needless to say, the rotation may be detected by a mechanical means such as a rotation of a member such as a roller.

In this embodiment, for the sake of simplicity, the description has been made such that the automatic loading is always performed when the back lid is closed. However, actually, only when the cartridge is set by the DX terminal or the cartridge detection switch, etc. It goes without saying that the system may be configured to go to the auto loading operation.

In this embodiment, an example is shown in which 3.75 frames are wound during auto-loading. However, it is needless to say that the number of frames may be changed depending on the configuration of the camera.

(Correspondence between the invention and the embodiment) In the above embodiment, the feeding means in claim 1 is the DC motor driving circuit 5 and the feeding motor 6. The open / closed state detecting means is the back cover switch 4. The feeding state detecting means is a feeding photo reflector 7. The automatic loading means is the sequence controller 1, the DC motor drive circuit 5, the feed motor 6, and the steps from S101 to S106 of the sequence controller. The control means includes the sequence controller 1 from S102 to S1
This is the step up to 09.

[0033]

As described above, according to the present invention, in the case of a normal auto-loading mistake such as a failure due to a small amount of pulling out of the leader portion of the film, the feeding state of the film is not detected. Even when the film is opened, rewinding is not conducted, and there is an effect that even if auto-loading error is repeated with an unused film, the film is not caught in the cartridge and becomes unusable.

When the back cover is opened and closed near the last frame, a film feed signal is generated during the auto loading operation because the film is loaded. Therefore, when the back cover is opened, the rewind direction is energized, so that the feeding gear system is disengaged, the film is smoothly taken out, and the camera is not damaged.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating the operation of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sequence controller 4 Back cover switch 5 DC motor drive circuit 6 Feed motor 7 Feed photo reflector

 ──────────────────────────────────────────────────の Continued on front page F-term (reference) 2H020 MA03 MA04 MC01 MC12 MC15 MC42 MC62 MC68 MC69 MC72 MC77 MC84 MC85 ME04 ME07

Claims (2)

[Claims] 1. A feeding means for feeding a film in a winding direction or a rewinding direction, an open / close state detecting means for detecting an open / close state of a back cover, and the back cover is closed by the open / close state detecting means. Auto-loading means for performing a feeding operation for feeding a predetermined amount of film in the winding direction by the feeding means in response to the above, a feeding state for detecting a feeding state of the film during the feeding operation by the auto-loading means Detecting means, when the back lid is opened after the feeding operation, if the feeding state detecting means has detected the feeding state of the film, while performing the feeding operation in the film rewind direction, Control means for controlling the feeding means so that the feeding operation in the rewinding direction is not performed if the feeding state detecting means has not detected the feeding state of the film. A camera characterized by having. 2. A camera according to claim 1, wherein said feeding state detecting means has a photo reflector, and said photo reflector detects a state of film perforation during said feeding operation.