JPH0511325A - Camera - Google Patents

Abstract

PURPOSE:To make it possible to rewind a film after detecting the last frame of the film without waiting for the bridging of the film with the accomplishment of the miniaturization of a camera. CONSTITUTION:The camera is provided with an instructing means 50 for continuously instructing the indexing of the following frame, or a part equivalent to it even after the indexing of a prescribed frame is completed in the case of performing the indexing of the prescribed frame to an aperture position, storing means 60, 61 for measuring the respective time intervals between two perforations installed on the prescribed frame, and between two perforations on the following frame, or on the part equivalent to it, and then, storing them as 1st and 2nd time intervals, and also, the camera is provided with a feeding controlling means 50 for comparing the 1st time interval with the 2nd time interval, and for instructing the rewinding of the film so that the prescribed frame may come to the aperture position in the case that the values are nearly equal, and for instructing the perfect rewinding of the film after deciding that the photographing of the prescribed number of the film frames is completed in the case that the value is drastically different from the other value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has two perforations for each frame at the upper ends of both ends of each frame, and a part corresponding to the next frame after the specified number of frames is provided for each frame. The present invention relates to a camera using a film having two perforations at an interval that is significantly different from the perforation interval.

[0002]

2. Description of the Related Art In a conventional camera, there is the following method for detecting the last frame of film.

1) The film is fed until it is stretched, and when the stretch is detected, rewinding of the film is started.

2) The perforation of the film is counted as it is fed, and if the next perforation does not come within a predetermined time, the film is rewound.

3) The specified number of frames of the film is first detected or set, and when the number of frames is reached, the film is rewound.

[0006]

However, each of the above 1) to 3) has the following problems.

That is, in 1), when the film is fed to the end and stretched, the film sometimes comes out of the film cartridge,
Sometimes the film I shot was wasted. Also in 2), basically, the next perforation does not come due to the film being stretched, so that the film is fed to the stretched position, which has the same problem as in 1) above.

In 3), in order to detect the specified number of frames from the film cartridge, the DX code of the film cartridge is usually read, but a large number of slices are provided in the camera to read the DX code. It had to be done, which led to the enlargement of the camera. Further, when the specified number of frames of the film is set first, a setting error or the like is likely to occur, and there is a problem that the film is rewound before the specified number of frames is reached.

In view of the above points, an object of the present invention is to provide a camera capable of detecting the final frame of the film and rewinding the film without waiting for the film to be stretched while achieving downsizing of the camera. Is to provide.

[0010]

SUMMARY OF THE INVENTION According to the present invention, when indexing a predetermined frame to the aperture position, the indexing of the next frame or a portion corresponding thereto is continuously performed after the indexing of the predetermined frame is completed. Instructing means for instructing the optical sensor, and measuring the time interval between the two perforations provided in a predetermined piece and the two perforations of the next piece or a portion corresponding thereto at the time of indexing the piece, respectively. Is stored as the first and second time intervals, and the first time interval and the second time interval are compared. If these values are substantially equal, the film feeding means and the optical sensor are provided with a predetermined value. When the film rewind is instructed so that the frame of the film comes to the aperture position, and these values are significantly different, it is considered that the filming up to the specified number of frames of the film is completed, and And a feeding control means for instructing the return.

[0011]

In the present invention, the two perforation intervals for the portion corresponding to the next frame after the specified number of frames are significantly different from the two perforation intervals provided for each frame, and 12 or 2 specified pieces
Paying attention to the fact that it is decided to be a predetermined piece such as 4, 36, when indexing this predetermined piece to the aperture position, the next piece and the part corresponding thereto are continuously indexed, and from the difference in these perforation intervals, The film rewinding control is performed by determining whether or not shooting up to the specified number of frames has been completed.

[0012]

1 to 5 show an embodiment of the present invention and are rear views showing the camera of FIG. 1 with a back cover removed.

In FIG. 1, 1 is a camera body, 2 is a cartridge chamber, 3 is a fork, 4 is a spool chamber, and 5 is a film take-up spool. Reference numeral 6 is an aperture of the camera, and the film is exposed in this portion. 7
Is a photoreflector arranged at the upper left as seen from the back of the camera, and detects the perforation of the film.

FIG. 2 is a diagram showing a film used in the present invention. 10 is a film cartridge loaded in the cartridge chamber 2, F is a film, and two perforations P are provided per screen. The left edge of the screen is represented by a and the right edge is represented by b. That is, the upper left perforation of the first frame is P1a, the upper right perforation is P1b, and similarly, the upper left perforation of the second frame is P2a and the upper right perforation is P2b.
Further, the upper left perforation of the 36th frame, which is the specified number of frames in this example, is represented by P36a (Pna), and the upper right perforation is represented by P36b (Pnb).
P37a (Pn + 1a) is the film surface located next to the specified number of frames, which is the upper left perforation corresponding to 37 frames indicated by the broken line, and P37b (Pn + 1b) is the perforation that indicates the end of the film F. Yes, P37a (Pn + 1a) and P37b (Pn + 1
The interval L ′ in b) is set to be considerably shorter than the normal perforation interval between frames, for example, the interval L between P36a (Pna) and P36b (Pnb). Also, P0b
Is a perforation on the leading end side of the film used for indexing the first frame. Fa is the leading edge of the film, F
b is a film end portion.

FIG. 3 is a block diagram showing a circuit configuration of a camera according to an embodiment of the present invention. 50 is a control circuit for controlling various circuits of the camera, 51 is a battery as a power source, and 52 is a release button. A switch that is turned on in the first stroke, and 53 is O in the second stroke of the release button.
N release switch 54 is a photometering circuit for measuring the subject brightness, 55 is a distance measuring circuit for measuring the distance to the subject, and 56 is a focus adjustment of a photographing lens (not shown) based on the information from the distance measuring circuit 55. AF drive circuit to perform, 5
Reference numeral 7 is a shutter control circuit for controlling the opening and closing of the shutter, 5
Reference numeral 8 is a motor drive circuit for driving the film feeding motor 59, 60 is a RAM, and 61 is a timer.

Next, the operation after loading the film cartridge 10 into the cartridge chamber 2 of the camera will be described with reference to FIG.
The flowchart will be described. "Step 101" Driving of the motor 59 is started via the motor drive circuit 58. As a result, the fork 3 starts to rotate, and the film cartridge 1 engaged with the fork 3 starts to rotate.
The supply spool in 0 also starts to rotate, and the feeding of the film F is started. That is, the known autoloading is started. [Step 102] The photoreflector 7 is driven to start the detection operation of the perforation P0b at the film front end Fa. And this perforation P0
When b is detected, the process proceeds to step 103. "Step 103" Here, the detection operation of the perforation P1a provided at the upper left of the first frame is started. When the perforation P1a is detected, the process proceeds to step 104. "Step 104" The drive of the motor 59 is stopped via the motor drive circuit 58. At this point, the first frame (# 1) of the film F has come to the position of the aperture 6 of the camera. "Step 105" It is determined whether or not the switch 52 (SW1) is turned on by the first stroke of the release button. If it is ON, the process proceeds to step 106 and O
If FF, stay in this step. "Step 106" The photometric circuit 54 and the distance measuring circuit 55 are driven to obtain respective information. [Step 107] It is determined whether or not the switch 53 (SW2) is turned on by the first stroke of the release button. If it is ON, the process proceeds to step 108 and O
If it is FF, the process returns to step 105. [Step 108] Here, focus adjustment of a photographing lens (not shown) is performed via the AF drive circuit 56 based on the information obtained by the distance measuring circuit 55, and then based on the information obtained by the photometric circuit 54. The shutter control circuit is operated to open / close a shutter (not shown), that is, perform an exposure operation.

After that, the drive of the motor 59 and the drive of the photo reflector 7 are started through the motor drive circuit 58, and the first frame is wound. That is, the film winding is continued until the next perforation P2a is detected by the photo reflector 7. Then, the same operation is repeated thereafter.

Here, in the present embodiment, attention is paid to the fact that the specified number of frames of the film is determined to be a predetermined number of frames, for example, 12, 24 and 36, and these predetermined frames are used for the aperture. When the arrival at the position 6 is detected, one frame is additionally fed, and the time interval between the two perforations corresponding to this frame is checked to rewind the film F without waiting for it to be stretched. It is possible. That is, as is apparent from FIG. 2, when the predetermined number of frames is the specified number of frames, if one extra frame is fed, the time interval between the perforations P37a and P37b is short (interval L '), and the specified number of frames is If it is not (when the predetermined number of pieces is "12" and the prescribed number of pieces is "36"), when one extra piece is fed, a perforation P13a (not shown in FIG. 2) is obtained. The time interval of the perforations P13b is long (interval L), and this is realized by measuring these time intervals.

This operation will be described below with reference to the flowchart of FIG.

Now, it is assumed that the photographing up to the 9th frame has been completed and the 10th frame has come to the position of the aperture 6. In this state, when the second stroke of the release button is made and the release switch 53 (SW2) is turned on, step 20
The operation from 1 is started. “Step 201” Here, step 1 in FIG.
The operation from 06 to step 108, that is, the known release operation is performed. [Step 202] The motor 59 is driven (normally energized) via the motor drive circuit 58 to start winding one frame of the film F. [Step 203] Here, it is determined whether or not the currently wound frame is a predetermined frame number n (= 12, 24, 36). At this time, since it is the 11th frame, the routine proceeds to step 204. "Step 204" The photo interrupter 7 detects perforation Pn + a, that is, P11a. When this perforation P11a is detected, the process proceeds to step 205. "Step 205" Assuming that the 12th frame has come to the position of the aperture 6, the motor 59 is driven via the motor drive circuit 58, and the winding of the film F is stopped. Then, the process returns to step 201.

Then, in step 201, the release operation is performed on the 12th frame, and when winding is started in step 202, the process proceeds to step 203 again, and whether the currently wound frame is the predetermined frame number n or not. Judgment is made. In this case, since it is the 12th frame, the routine proceeds to step 206 assuming that the number of frames is the predetermined number n. "Step 206" Here, the timer 61 is activated,
Start the counting operation. "Step 207" The photo interrupter 7 detects the perforation Pnb, that is, P12b. When this perforation P12b is detected, the process proceeds to step 208. "Step 208" Here, the operation of the timer 61 is stopped and the counting operation is stopped. "Step 209" The count content of the timer 61,
That is, the time interval Tn between P12a and P12b is set to the RAM 60.
Remember. "Step 210" The photo interrupter 7 detects perforation Pn + 1a, that is, P13a. When this perforation P13a is detected, the process proceeds to step 211. "Step 211" The timer 61 is operated again to start the counting operation. "Step 212" The photo interrupter 7 detects perforation Pn + 1b, that is, P13b. When this perforation P13b is detected, the process proceeds to step 213. As a result, the film F is sent by one frame. "Step 213" The operation of the timer 61 is stopped and the counting operation is stopped. "Step 214" The count content of the timer 61,
In other words, the perforation of the extraly wound piece P13a
The time interval Tn + 1 of P13b to P13b is stored in the RAM 60. “Step 215” Here, the data is stored in the RAM 60,
The comparison between Tn and Tn + 1 is performed. If Tn + 1 is a much shorter time interval, the process proceeds to step 221, and if they are almost equal, the process proceeds to step 216. Here, since the predetermined number of frames and the specified number of frames do not match, Tn and Tn + 1 are equal, and therefore the process proceeds to step 216. "Step 216" The drive of the motor 59 is stopped via the motor drive circuit 58. [Step 217] As described above, at this point, the unexposed frame of the 13th frame, which is the next 14th frame, has arrived at the position of the aperture 6. Therefore, the motor 59 is driven via the motor drive circuit 58. Is reversely energized to start rewinding one frame of the film F. "Step 218" The photo interrupter 7 detects perforation Pn + 1a, that is, P13a. When this perforation P13a is detected, the process proceeds to step 219. "Step 219" The drive of the motor 59 is stopped via the motor drive circuit 58. "Step 220" The motor 59 is positively energized via the motor drive circuit 58. This is because, since the film F is fed in reverse, even if the perforation P13a is detected and stopped, the screen position is shifted right and left by one perforation (the position of the photoreflector 7 and the perforation in FIG. 2). This is to correct this by the following step 204 (from the relationship). "Step 204" The photo interrupter 7 detects the perforation Pn + 1a, that is, P13a again. As a result, the thirteenth frame comes to the position of the aperture 6 properly.

After that, the operation returns to step 201 after the operation of step 205.

Next, the case where the current frame is the 36th frame will be described.

In this case, steps 207 → 208 → 20
9 → 210 → 211 → 212 → 213 → 214 → 215
2, the comparison between Tn and Tn + 1 is performed. At this time, as is clear from FIG. 2, Tn + 1 (the time interval between P37a and P37b) is a much shorter time interval, so step 221 Go to. "Step 221" The forward drive of the motor 59 is stopped via the motor drive circuit 58. "Step 222" Assuming that the final frame of the film F has been reached, reverse energization of the motor 59 is started via the motor drive circuit 58, and rewinding of the film F into the film cartridge 10 is started.

As a result, it becomes possible to rewind the film after waiting for the film to be stretched without fail to wait for the film to be stretched.

[0026]

As described above, according to the present invention,
At the time of indexing a predetermined frame to the aperture position, even after the indexing of the predetermined frame is completed, an instruction means for instructing the film feeding means and the optical sensor to index the next frame or a portion corresponding thereto, and at the time of indexing the frame. A memory for measuring the time intervals of two perforations provided in a predetermined piece and two perforations of the next piece or a portion corresponding to this, and storing these as first and second time intervals. Means for comparing the first time interval and the second time interval, and if these values are substantially equal, the film rewinding means and the optical sensor rewind the film so that a predetermined frame comes to the aperture position. And if these values are significantly different, it is provided with a feeding control means for instructing the rewinding of all the films, assuming that the shooting up to the specified number of film frames has been completed, The two perforation intervals for the portion corresponding to the next frame after the fixed number of frames are significantly different from the two perforation intervals provided for each frame, and the specified number of frames of the film is 12, 24. ,
Paying attention to the fact that a predetermined piece such as 36 is decided, when the predetermined piece is indexed to the aperture position, the next piece and the portion corresponding thereto are continuously indexed. The film rewinding control is performed by determining whether or not shooting up to a certain number has been completed. Therefore, it is possible to detect the last frame of the film and rewind the film without waiting for the film to be stretched, while achieving downsizing of the camera.

[Brief description of drawings]

FIG. 1 is a rear view showing a camera according to an embodiment of the present invention with a back cover removed.

FIG. 2 is a diagram illustrating a film used in the present invention.

3 is a block diagram showing a schematic configuration of the camera of FIG.

FIG. 4 is a flow chart showing an operation of the camera when a film is loaded and a first frame is photographed in the embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of a main part in one embodiment of the present invention.

[Explanation of sign]

 7 Photo Reflector 50 Control Circuit 58 Motor Drive Circuit 59 Motor for Film Feed 60 RAM 61 Timer F Film

Claims (1)

Claims: 1. One piece has two perforations at the upper ends of both ends of each piece, and a portion corresponding to the next piece of the specified number of pieces is provided in each of the above pieces. A camera using a film having two perforations at an interval greatly different from the perforation interval, the film feeding means for feeding the film and the film fed in the direction of the film take-up spool. An optical sensor for detecting a perforation, which is arranged on the upper left side of the aperture when viewed from the rear of the camera, and when indexing a predetermined frame to the aperture position, the next frame or the next frame is continuously processed even after the indexing of the predetermined frame is completed. Instructing means for instructing the film feeding means and the optical sensor to index the portion corresponding to this, and the frame dividing means. At time, the time intervals of the two perforations provided in a predetermined piece and the two perforations of the next piece or a portion corresponding thereto are measured, and these are stored as the first and second time intervals. Storage means and the first
And the second time interval are compared, and if these values are substantially equal, the film feeding means and the optical sensor are instructed to rewind the film so that a predetermined frame comes to the aperture position, If these values are significantly different, the camera is characterized by including a feeding control means for instructing the rewinding of all the films, assuming that the filming up to the specified number of film frames has been completed.