JPH10142660A - Film feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set an unexposed frame even when a partially exposed film cartridge is charged by using a single system photoreflector for detecting perforations. SOLUTION: Information in a film cartridge 26 containing partially exposed information is detected by means of a photoreflector 30, and then, a motor is driven so that idle feeding, winding, and rewinding of the film 26 are carried out by means of a film feeding mechanism 35. The moving condition of film perforations accompanying feeding is detected by means of a single system photoreflector 30, and recorded information in each frame of the film 26 is read by means of the photoreflector 30. When the photoreflector 30 determines that the partially exposed film cartridge 26 is charged, winding is carried out while reading the film information after idle feeding is carried out, and then, winding is stopped in the frame in which no information is recorded. Subsequently, rewinding is carried out by two frames from the position in which winding is stopped, and then, winding is carried out by one frame again, so that the front unexposed frame can be set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding apparatus, and more particularly to a film feeding apparatus for a camera capable of reloading a cartridge which has been rewound halfway.

[0002]

2. Description of the Related Art A camera capable of recording photographing data such as a date and printing conditions on a magnetic recording portion of a film is known.
It is already known. For example, Japanese Patent Application Laid-Open No. 7-5559 filed by the present applicant describes a technique for reading data recorded on a magnetic layer of a film. Further, Japanese Patent Application No. 8-184904, which was an earlier application filed by the present applicant, discloses that after recording data on a magnetic layer of a film, when a photographer wants to rewrite the data, the film is once rewound by one frame, and then again. A technique of winding data while overwriting the data is described.

In addition, a well-known camera generally using a film having the above-mentioned magnetic recording portion, for example, a camera called Vectis S-1 manufactured by Minolta Co., Ltd., is equipped with a photodetector for detecting the perforation of the film. One reflector is provided at each end of the screen,
After the partial exposure cartridge is loaded, a technique of setting an unexposed frame by winding up the film until the unexposed frame is detected and rewinding the film by one frame is mounted.

[0004]

However, Japanese Patent Application Laid-Open No. Hei 7-5559 and Japanese Patent Application No. Hei.
No. 4 does not describe a case where a film cartridge which has been partially exposed is loaded.

The above-mentioned Vectis S manufactured by Minolta Co., Ltd.
The technology mounted on a camera referred to as -1 requires two photoreflectors for detecting perforation. Therefore, there are problems such as an increase in cost and an increase in the size of the camera. In addition, since the film is rewound and stopped, complicated control and adjustment are required to increase the accuracy between frames.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the number of unexposed frames even when a partially exposed film cartridge is loaded without increasing the cost and size of the camera. An object of the present invention is to provide a film feeding device that can be set.

[0007]

That is, the present invention relates to a cartridge information detecting means for detecting information of a film cartridge including partially exposed information, and a feed for performing idle feeding, winding and rewinding of a film by driving a motor. Means, a system of perforation detecting means for detecting the movement state of the film perforation accompanying the feeding, and film information reading means for reading the recording information of each film frame, and the film partially exposed by the cartridge information detecting means. When it is determined that the cartridge has been loaded, winding is performed while reading the above film information after the idle feeding, winding is stopped at a frame having no record information, two frames are rewound from the position where the winding was stopped, and one frame is returned again. It is characterized in that the unexposed frame is caught by winding up.

Further, the present invention provides a cartridge information detecting means for detecting information on a loaded film cartridge, a winding means for winding up a film, a rewinding means for rewinding the film, and a movement of perforation of the film. The cartridge comprises: a perforation detecting means for locating an accurate frame in the film winding direction; and a film information detecting means for detecting data of a data recording section provided for each frame of the film. When it is determined by the information detecting means that the loaded film cartridge has been partially exposed, the film is wound up, the data in the data recording section of the film is detected, and the first found frame without data is detected. To stop winding, rewind two frames from the position where the winding was stopped, and Characterized by the beginning of the unexposed frame by raising.

In the film feeding apparatus according to the present invention, the information of the film cartridge including the partially exposed information is detected by the cartridge information detecting means, and the idle driving, winding and rewinding of the film are performed by the motor drive. Done in Then, the movement state of the film perforation accompanying the feeding is detected by one system of perforation detecting means, and the recording information of each film frame is read by the film information reading means. When it is determined by the cartridge information detecting means that a partially exposed film cartridge has been loaded, winding is performed while reading the film information after idle feeding, and winding is stopped at a frame having no record information. Next, two frames are rewound from the position where the winding is stopped, and one frame is rewound again.

Further, in the film feeding apparatus according to the present invention, the information of the loaded film cartridge is detected by the cartridge information detecting means. Further, the film is wound by the winding means, and the film is rewound by the rewinding means. The movement of the perforation of the film is detected by the perforation detecting means, and accurate frame positioning in the film winding direction is performed. The data in the data recording section provided for each frame of the film is detected by the film information detecting means. When it is determined that the loaded film cartridge is partially exposed by the cartridge information detecting means, the film is wound up and the data in the data recording section of the film is detected, and the film is first detected. Winding is stopped at the frame without data. Next, two frames are rewound from the position where the winding is stopped, and one frame is further rewound, so that the unexposed frame is caught.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a camera to which a film feeding device of the present invention is applied.

In the camera shown in FIG. 1, the microcomputer 11 controls the operation of the entire camera. The microcomputer 11 includes a photometric circuit 12 having a known configuration, a distance measuring circuit 13, a shutter control mechanism 14,
A focus adjustment mechanism 15, a display circuit 16 for displaying various information such as shooting information, date, and operation mode of the camera;
A storage circuit 17 for storing the number of film frames, camera adjustment data, and the like constituted by a PROM is connected.

Further, the microcomputer 11 has a release switch (R) for starting an exposure operation.
ELSW) 18, a rewind switch (REWSW) 19 that is operated when rewinding the film whose shooting has been completed to the film cartridge, a power switch (PWSW) 20 linked to the power supply of the camera, and the film cartridge is loaded into the camera. And a cartridge detection switch (PTSW) 21 that is turned on.

Further, a magnetic head 24 is connected to the microcomputer 11 via a magnetic recording circuit 22 and a magnetic detection circuit 23. This magnetic head 24
Is used to record data on a magnetic layer (not shown) on the film 25 or to detect that data is recorded on the magnetic layer on the film 25.

By controlling the magnetic recording circuit 22 with the magnetic head 24, data can be recorded on the film 25. On the other hand, by controlling the magnetic detection circuit 23, it is possible to detect whether or not data exists on the film 25.

The technique for recording data on the magnetic layer on the film 25 by the magnetic head 24 and the technique for detecting data are described in the above-mentioned Japanese Patent Application No. 8-184904 and Japanese Patent Application Laid-Open No. Since it is described in detail in JP-A-7-5559, the description is omitted here.

The film 25 is housed in a film cartridge 26 at the start of use, and is fed to a take-up spool 27. In addition, the film 25
As shown in FIG. 3, a perforation 25a for defining and detecting the position of the film is provided. The perforations 25a are detected by a photo reflector (PR) 28 installed near the fed film 25.

On the film cartridge 26, a bar code 29 is formed on its spool shaft. The barcode 29 stores the sensitivity of the film 25 and the number of shots. The data stored in the barcode 29 is detected by a photo reflector (PR) 30.

The initial position of the spool shaft of the film cartridge 26 can be detected from the signal of the bar code 29. By detecting the initial position, it is determined that the film cartridge 26 loaded in the camera is in one of the “unexposed”, “partially exposed”, “exposed”, and “developed” cartridge states.

In the vicinity of the film cartridge 26, a photo interrupter (PI) 31 for measuring the moving amount and moving speed of the film 25, and a film 2
5 and a disk 32 with a slit that rotates in conjunction with the movement of the disk 5. The photo interrupter 31 changes the output signal by reading the disk 32 with slits.

The output signals of the photoreflectors 28 and 30 and the photointerrupter 31 are supplied to a signal processing circuit 33.
Is converted into a signal that can be input to the microcomputer 11. That is, the output signal of the photoreflector 28 is supplied to the input port P-PR,
The output signal of 0 is supplied to the input port P-BPR, and the output signal of the photointerrupter 31 is supplied to the input port P-PI.

Control of winding and rewinding of the film 25 is performed by a motor connected to a film feeding mechanism 35 via a drive circuit 34. The film feeding mechanism 35 will be described later.

The positional relationship between the photoreflector 28, the opening provided for exposure, and the film 25 will be described with reference to FIG. 6B. Now, a photo reflector 28 is provided at a position where the frame of the film 25 fits into the opening and the perforation of the film 25 is on the left side in the drawing in the winding direction. For this reason, usually, when winding up one frame, 1
Predicting the end of a frame with the first perforation signal, lowering the feed rate and stopping the film 25 at the falling edge of the second perforation signal allows maintaining the accuracy between frames. become.

However, even if the film 25 is similarly driven in the rewind direction by using the photo reflector 28 and is to be moved by one frame, it must be stopped at the first rising edge of the perforation signal. However, it is impossible to perform control such as lowering the feeding speed predicted at the time of the winding. In addition, variations in the feeding speed that can occur due to various factors, such as the type of film, load fluctuation due to thickening of the film wound on the spool, change in film hardness due to temperature change, battery set-down condition, etc. Therefore, the accuracy between the pieces cannot be maintained.

With respect to the positional relationship between the photoreflector 28, the opening, and the frame of the film, by always performing feed control in the winding direction, it is possible to maintain a high precision between frames even under the above-described disturbance. Becomes

Next, the film feeding mechanism 35 of the camera will be described. FIG. 2 is a perspective view of the film feeding mechanism 35 seen through from behind the camera. The state of the film feeding mechanism 35 is shown immediately after the film cartridge 26 is loaded in the camera body.

A pinion gear 37 is provided on the output shaft of a film winding / rewinding motor (M1) 36 provided in the camera body. The pinion gear 37 is engaged with a sun gear 38. Furthermore, this sun gear 38
Are engaged with the planetary gear 40 by the gear arm 39. The planet gear 40 is formed by the gear arm 39 described above.
It is supported so as to revolve around the rotation axis of the sun gear 38.

A take-up spool 27 for taking up a film is rotatably provided in a film take-up chamber provided on the right side as viewed from the rear of the camera body. A spool gear 41 that meshes with the planet gear 40 when the planet gear 40 revolves counterclockwise is integrally provided on the upper end surface of the take-up spool 27. The film pressing plate 42 presses the film against the winding spool 27 by the tension of the spring 43.

When the planetary gear 40 revolves clockwise, the idle gear 44 is brought into a position where it meshes with the planetary gear 40.
Is provided. This idle gear 44 is gear 4
5, 5, and 47 are connected to a coupler gear 48 described later. On the left side from the rear of the camera body, there is a cartridge storage chamber for storing the film cartridge 26.

Above the cartridge storage chamber, a coupler gear 48 having a coupler 49 whose tip projects in a "-(minus)" shape is rotatably provided. As shown in FIG. 3, the coupler 49 is engaged with a groove provided on an upper end surface of a feed spool 50 provided on the film cartridge 26, and is integrated with the feed spool 50 around the axis. .

The camera body is provided with a film feed motor (M2) 51. A pinion gear 52 is provided on the output shaft of the film delivery motor 51. The pinion gear 52 meshes with a sun gear 53, and the sun gear 53 further
4 meshes with the planet gear 55. The planet gear 55 is supported by the gear arm 54 so as to revolve around the rotation axis of the sun gear 53.

Since the tension of the spring 56 acts on the gear arm 54, only when the film feed motor (M2) 51 rotates counterclockwise, the planetary gear 55 and the idle gear 4 are rotated.
7 mesh with each other. The film 25 is exposed with light from the opening 58 of the camera body.

The photo reflector 27 is for detecting the perforation provided on the film 25 as described above. As shown in FIG. 3, perforations 25a are formed on the left and right of the exposure area 25b of each frame of the film 25.

The magnetic head 24 is arranged near the opening 58. A pad 59 is arranged so as to face the magnetic head 24 and sandwich the film 25 therebetween.
The pad 59 is fixed to a leaf spring 60, and is pressed against the film 25 by the tension of the leaf spring 60. Then, the magnetic head 24 records data in a magnetic data recording area 25c provided below the exposure area 25b.

The outer periphery of the roller member 61 is formed of rubber or the like, and rotates in conjunction with the movement of the film 25. The above-described disk with slit 32 is integrated with the rotation shaft of the roller member 61. Therefore, when the roller member 61 rotates in a predetermined direction, the slit disc 32
Rotates. Each time the slit of the disk with slit 32 crosses the photo interrupter 31, a signal serving as a reference for the timing of the recording operation is output from the photo interrupter 31.

Next, the operation of the camera of this embodiment will be described. FIGS. 4 and 5 are flowcharts showing a main routine of the operation of the camera. In the following description, the reference numerals of the components shown in FIG.

First, in step S1, when the power of the camera system is turned on, the microcomputer 11 is reset on power. Then, in the microcomputer 11, the initialization of the I / O port, the initialization of the memory, and the like are performed.

Subsequently, in step S2, the microcomputer 11 determines the state of the cartridge detection switch 21. Here, the patrone detection switch 2
When the state 1 changes from "off" to "on", the process proceeds to step S3.

In step S3, the initial position of the spool shaft is detected from the bar code 29. This makes it possible to determine whether the state of the film cartridge 26 is “unexposed” or “partial exposure”. Although not described in this flowchart, if it is determined that the film cartridge is in the "exposed" or "developed" state, the film feed operation from step S4 is not performed, and the photographer is notified that the film feed has failed. .

In step S4, the bar code 29
The film sensitivity and the number of frames are read. Then, step S
At 5, the microcomputer 11 pulls out the film 25 from the film cartridge 26 and winds the film 25 around the take-up spool 27. Then, the film 25 is moved so that the exposure area of the first frame of the film 25 matches the opening 58 of the camera body.

Next, in step S6, it is determined whether the state of the film cartridge is "partial exposure". Here, if it is determined that the image is “unexposed”, the image can be taken immediately in this state. You.

That is, if it is determined in step S6 that the film is a "partially exposed" film, it is detected in step S7 that data is recorded on the magnetic recording layer of the photographed frame. Frames are sequentially fed while being detected, and unexposed frames on which no data is recorded are detected.

In step S7, the signal shaped by the magnetic detection circuit 23 is detected at the input port of the microcomputer 11 while winding one frame. Then, in step S8, the presence or absence of data recording is determined based on whether or not the number of pulses of the signal in one frame is equal to or greater than the predetermined number of pulses in one frame. Steps S7 and S8 are repeated until a frame with no data recorded is found. The processing operation of the magnetic recording detection winding subroutine in step S7 will be described later.

FIG. 6 is a diagram showing the positional relationship between the film 25 and the opening 58. As shown in FIG. The positional relationship of the unexposed frame X to the opening 58 is as shown in FIG.

If a frame with no recorded data is found, the position of the film 25 is too far in the winding direction than the opening 58 of the camera. The state shown in FIG. 6B corresponds to this. FIG. 6E is an enlarged view showing the positional relationship between the photoreflector 28 and the film 25 shown in FIG. 6B. In order to increase the accuracy of the distance between the frames, it is necessary to stop one frame feed in the winding direction. Therefore, in steps S9 and S10,
Two frames of film are rewound. The details of the processing operation of the subroutine for rewinding one frame will be described later.

FIG. 6C shows the relationship between the unexposed frame X and the opening 58 when the frame is rewound by two frames. Next, in step S11, the magnetic recording prohibition flag is set to "1" so that erroneous data is not overwritten and magnetically recorded when winding one frame, and the magnetic recording circuit 22 is not operated when winding one frame. I do. Then, step S1
In 2, the winding of one frame is performed. FIG. 6D shows this state. The processing operation of the one-frame winding subroutine will be described later.

When the winding of one frame is completed, preparation for photographing is completed, and the process returns to step S2. FIG. 7 is a timing chart showing the operation at this time. If there is no change in the state of the cartridge detection switch 21 in the slap S2, the process proceeds to step S13, where the microcomputer 11 determines the state of the rewind switch 19. Here, when the rewind switch 19 changes from "OFF" to "ON", the process proceeds to step S14, and the operation of rewinding the film 25 to the film cartridge 26 is performed. After that, the process returns to step S2, and the processes after step S2 are repeated.

On the other hand, if there is no change in the rewind switch 19 in step S13, step S1 is executed.
Proceeding to 5, the state of the power switch 20 is determined. Here, when the state of the power switch 20 is “OFF”,
The main routine is terminated by the microcomputer 11, and the operation of the camera is stopped.

On the other hand, if the power switch 20 is "ON" in step S15, the process proceeds to step S16.
The microcomputer 11 receives temperature data from a temperature measurement circuit (not shown) in the microcomputer 11. Subsequently, in the microcomputer 11, in step S17, the luminance data received from the photometric circuit 12 is compared with the luminance data received in step S7.
Shutter speed Tv based on the sensitivity data read in
And the aperture value Av are calculated. Then, in step S18, the calculated shutter speed Tv and aperture value Av are displayed on the display circuit 16.

Next, in step S19, the microcomputer 11 determines the state of the release switch 18. Here, when there is no change in the release switch 18, the process returns to step S2, and the processes after step S2 are repeated.

On the other hand, if the release switch 18 is "ON" in step S19, the process proceeds to step S20, where the microcomputer 11 determines the distance to the subject (subject distance) based on the data output from the distance measuring circuit 13. Is calculated. Then, in step S21, the focus adjustment mechanism 15 is controlled based on the data of the subject distance. Further, in step S22, the already calculated T
The exposure to the film 25 is performed by controlling the shutter control mechanism 14 based on the v value and the Av value.

When the exposure operation is completed, the process proceeds to step S23, where the microcomputer 11 creates data to be recorded on the magnetic layer of the film 25. After the completion of the recording data creation in step S23, the magnetic recording prohibition flag is set to "0" in step S24 to permit magnetic recording.

Thereafter, the flow advances to step S25 to execute a subroutine "winding up one frame".
Then, the film 25 is wound up by one frame, and the data created in step S23 is magnetically recorded.

Next, with reference to the flowcharts of FIGS. 8 and 9 and the timing chart of FIG. 10, the processing operation of the subroutine "winding up one frame" will be described. FIG.
The timing chart 0 (b) shows the magnetic recording portion of the head current in FIG. 10 (a) in an enlarged manner.

In this subroutine "winding one frame", the exposed film is wound up by one frame. When the magnetic recording is permitted, the magnetic recording operation is executed using the interrupt function of the microcomputer 11 during the execution of this subroutine.

When the subroutine "single frame winding" is started, the microcomputer 11 reads parameters related to magnetic recording and control parameters of the winding and rewinding motor (M1) 36 from the storage circuit 17. Subsequently, in step S32, the registers PICNT and PRC
NT is cleared ("0" is set). Where PI
CNT is a register for counting pulse signals output from the photointerrupter 31, and PRCNT is a register for counting changes in the signal of the photoreflector 28.

Subsequently, in step S33, the microcomputer 11 sets the applied voltage (Vml) of the motor (M1) 36, and in step S34, the motor (M1) is set.
1) 36 is turned on. This operation is performed at the timing of * 1 on the timing chart of FIG. 10A, whereby the film 25 starts to move.

If the magnetic recording prohibition flag is "1" in step S35, the flow shifts to step S37. If the magnetic recording prohibition flag is “0”, step S
Then, the motor (M1) 36 is turned on, and a current in the positive direction is immediately supplied to the magnetic head 24.

Subsequently, in step S37, the count of the first timer counter (T1) is started. This first timer counter (T1) is provided by the photointerrupter 3
Used to measure the interval of one pulse signal. T1 on the timing chart of FIG.
This is the pulse signal interval.

Next, in step S38, the microcomputer 11 determines whether the input port P-PI is
It is determined whether a pulse has been input. Where PI
When the pulse signal has been input, the process proceeds to step S39, and the data of the first timer counter (T1) is recorded in the register _TFV . Next, in step S40, the value of the first timer counter (T1) is cleared ("0" is set) to measure the interval of the pulse signal.

[0061] Subsequently, at step S41, based on the data of the register T _FV, parameters Tbitf and Tbitr required magnetic recording is read from the data table exists in the program memory. Then, the data recorded in the register T _FV is used as an address of the data table as T
Bitf and Tbitr are read.

[0062] At step S42, the microcomputer 11 is stored is stored in Tbitf that read from the data table the correction value Cf is hooked into the register T _BF, also with the correction value Cr is multiplied Tbitr to T _BR . The correction values Cf and Cr have been read from the storage circuit 17 in step S31.

Next, in step S43, the microcomputer 11 increments (+1) a register PICNT for counting the number of PI pulses. Then, in the step S44, whether the PICNT is equal to the predetermined number P _ST is determined. This predetermined number P _ST is:
The magnetic recording start position on the film 25 is shown (FIG. 1).
0 (a) corresponds to the timing of * 2 on the timing chart). Note that the predetermined number P _ST is calculated in the step S
At 31, the data is read from the storage circuit 17.

In the above step S44, PICNT
When is equal to P _ST, the process proceeds to step S45 to initiate the magnetic recording. Then, in this step S45, the head address #ADst of the data to be magnetically recorded is set in the register ADRS. Subsequently, step S46
, The data at the address specified by the register ADRS is read out and stored in the register datsX. Next, in step S47, after the data of dataX is decomposed by one bit, it is determined in step S48 whether the divided bits are "1" or "0".

In step S48, if the bit is "1", the flow shifts to step S49 to set _TBF data in the second timer counter (T2). On the other hand, if the above bit is "0", the flow shifts to step S50 to set the data of _{TBR in} the second timer counter (T2).

Thereafter, in step S51, the counting operation of the second timer counter (T2) is started, and
In step S52, a magnetic recording prohibition flag is determined. That is, in step S52, when the magnetic recording prohibition flag is "0" and the magnetic recording is permitted, the process proceeds to step S53, and the current direction of the magnetic head 24 is changed from + (plus) to-(minus). Flipped to This operation is performed at the timing of * 3 on the timing chart shown in FIG.

When the set time (T _BR or T _BF ) elapses, the second timer counter (T 2) generates an interrupt request signal (* in the timing chart shown in FIG. 10B). Equivalent). When this signal occurs, interrupt processing is performed.

In the interrupt processing, the direction of the current of the magnetic head 24 is reversed. Then, in order to generate the next interrupt request signal, _TBF or _TBR is set in the second timer counter (T2) according to the data to be magnetically recorded. Since T _BF and T _BR change in accordance with the film speed by the processing of steps S38 to S51 described above, the film speed and the magnetic recording speed move in conjunction.
Therefore, even if the film speed changes, the recording density does not change.

The above is the processing in the microcomputer 11 when the PI pulse is input. Next, a process when the perforation 25a provided on the film 25 is detected will be described.

[0070] When the PI pulse signal in the above-mentioned step S38 is not input, or when the register PICNT is not equal to the predetermined number P _ST in the above-mentioned step S44, or after the processing in step S53 is completed, each step S54 Move to.

In step S54, the microcomputer 11 determines whether or not there is a change in the signal of the photoreflector 28 from the input port P-PR.
Here, when a change is detected in the signal, step S55
The register PRCNT for counting the signal edges of the photoreflector 28 is incremented (+1).
Is done. Subsequently, in step S56, PRCNT
Is determined to be equal to # 2, and if it is equal to # 2, the process proceeds to step S57.

When the signal of * 4 on the timing chart shown in FIG. 10A is detected, it is understood that the winding operation of the film 25 is nearing the end. In order to easily stop the film 25, it is necessary to reduce the speed, and it is necessary to terminate the magnetic recording. This is because a gap is provided between the area where the magnetic data of the next frame is recorded and the current recording area for convenience in reproducing the magnetic data.

In step S57, the microcomputer 11 controls the first timer counter (T1) and the second timer counter (T1).
Of the timer counter (T2) is stopped. As described above, by stopping the second timer counter (T2), no interrupt request signal is generated, and the magnetic recording is stopped. Further, since there is no need to measure the time interval of the PI pulse, the first timer counter (T1) is also stopped.

Subsequently, at step S58, the motor (M
1) The short brake is applied to 36 for a predetermined time (T _S1 on the timing chart of FIG. 10A). Then, in step S59, the voltage applied to the motor (M1) 36 is reduced (Vm2 on the timing chart of FIG. 10A). As described above, by reducing the short brake and the voltage, the speed of the film 25 sharply decreases.

If it is determined in step S54 that the signal from the photoreflector 28 has not changed, the process proceeds to step S3.
8 and the processing after step S36 is repeated. In step S56, the value of PRCNT is #
If it is not equal to 2, the process proceeds to step S60, and P
It is determined whether the value of RCNT is equal to # 4. If the value of PRCNT is not equal to # 4, the process returns to step S38.

On the other hand, in step S60, the PR
When the value of CNT is equal to # 4, the winding operation is completed, and the process shifts to step S61 to stop the current to the magnetic head 24 by the microcomputer 11 (see * 5 in the timing chart of FIG. 10A). Equivalent to).

Subsequently, at step S62, the motor (M
1) The short brake is applied to 36 for a predetermined time (T _S2 on the timing chart of FIG. 10A). Further, in step S63, a negative voltage is applied to the motor (M1) 36 for a predetermined time (T _R on the timing chart of FIG. 10A). Then, in step S64,
The short brake is applied to the motor (M1) 36 for a predetermined time (T _S3 on the timing chart of FIG. 10A). By the processing of steps S62 to S64 described above,
The film 25 is completely stopped.

As described above, the subroutine "wind one frame"
Ends. It should be noted that Vm which is a parameter related to the speed control of the film on the timing chart shown in FIG.
_{1, Vm2, T S1, T} S2, T S3, T R is prestored circuit 1
7 should be stored. As a result, optimal parameters can be set according to the individual manufacturing characteristics of the film feeding mechanism 35 and the environment in which the camera operates.

Next, the operation of the subroutine "winding of magnetic recording detection" will be described with reference to the flowchart shown in FIG. 11 and the timing chart of FIG. In this subroutine, the film is wound up by one frame while detecting whether or not the frame has been exposed.

When the subroutine "magnetic recording detection winding" is started, in step S71, the microcomputer 11 reads out parameters related to magnetic recording and control parameters of the winding / rewinding motor (M1) 36 from the storage circuit 17 in the microcomputer 11. Is done. Next, in step S72,
The registers JICNT and PRCNT are cleared ("0" is set). Here, JICNT is the magnetic detection circuit 22
Is a register for counting a pulse signal output from the PDP, and PRCNT is a register for counting a change in a signal from the photoreflector 28.

Subsequently, in step S73, the microcomputer 11 sets the applied voltage (Vm1) of the motor (M1) 36, and then in step S74, the motor (M1) is set.
1) 36 is turned on. This operation is performed at the timing of * 1 on the timing chart shown in FIG. 12, whereby the film 25 starts to move.

After the motor (M1) 36 is turned on,
In step S75, the magnetic detection circuit 23 is immediately turned on. Next, in step S76, the microcomputer 11 determines whether or not a JI pulse has been input based on the state of the input port P-JI. If the JI pulse has been input in step S76, the process proceeds to step S77, where the microcomputer 11 registers the register JICNT for counting the number of JI pulses.
Is incremented (+1).

Here, the processing when the perforation 25a provided on the film 25 is detected will be described. If a JI pulse signal is not input in step S76, the process proceeds to step S78. In this step S78, the microcomputer 11
It is determined from the input port P-PR whether the signal of the photoreflector 28 has not changed. Here, when a change is detected, the process proceeds to step S79, where the register PRCNT for counting the signal edges of the photoreflector 28 is incremented (+1).

Subsequently, in step S80, PRCNT
Is determined to be equal to # 2. Here, when the value of the PRCNT is equal to # 2, the process shifts to step S81, and the short brake is applied to the motor (M1) 36 for a predetermined time. Thereafter, in step S82, the voltage applied to the motor (M1) 36 is reduced (Vm2 on the timing chart of FIG. 12).

As described above, the speed of the film 25 is rapidly reduced by applying the short brake to lower the voltage. Thereafter, in step S78, if there is no change in the signal of the photoreflector 28, the process proceeds to step S78.
Then, the process returns to step S76, and the processing after step S76 is repeated.

Further, in step S80, the PRC
If the value of NT is not equal to # 2, the flow shifts to step S83 to determine whether or not the value of PRCNT is equal to # 4. If the value of PRCNT is not equal to # 4, the process returns to step S76. On the other hand, if it is equal to # 4, the winding operation is completed, so the flow shifts to step S84 and the microcomputer 11 turns off the magnetic detection circuit 23.

Next, in step S85, the short brake is applied to the motor (M1) 36 for a predetermined time. Then, in step S86, a negative voltage is applied to the motor (M1) 36 for a predetermined time. Further, step S
At 87, short brake is applied to the motor (M1) 36 for a predetermined time. Steps S85 to S8 described above
By the process of 7, the film 25 is completely stopped.

Thus, the subroutine "winding of magnetic recording detection" is completed. Next, the operation of the subroutine "one frame rewind" will be described with reference to the flowchart of FIG. 13 and the timing chart of FIG.

When the subroutine "one frame rewind" is started, in step S91, the microcomputer 11 reads the hoist / rewind motor (M1) 3 from the storage circuit 17 by the microcomputer 11.
6 are read out. Then, step S
At 92, the register PRCNT is cleared ("0" is set). This register PRCNT is a register for counting changes in the signal of the photoreflector 28.

Subsequently, in step S93, the microcomputer 11 sets the voltage (Vm1r) applied to the motor (M1) 36. Then, in step S94, the motor (M1) 36 is turned on so as to rotate counterclockwise. Thus, the film 25 starts moving in the rewinding direction.

Next, in step S95, the microcomputer 11 determines whether or not the signal of the photoreflector 28 input to the input port P-PR has changed. Here, this determination is repeated until the signal of the photoreflector 28 changes. When there is a change in the signal of the photoreflector 28, step S
The flow shifts to 96, where PRCNT is incremented (+1).

In step S97, the microcomputer 11 determines whether the value of PRCNT is equal to # 6. Here, when the value of _PRCNT is equal to # 6, the short brake is applied to the motor (M1) 36 for a predetermined time (T _S1r ). Step S9 above
The operation of No. 8 corresponds to * 11 on the timing chart of FIG.

Subsequently, in step S99, the microcomputer 11 reduces the voltage applied to the motor (M1) 36 to a predetermined value (Vm2r). Thereafter, the process returns to step S95, and the processing after step S95 is repeated.

As described above, the above steps S98 and S9
By the operation of No. 9, the film speed is reduced. P1, P2, P3, P4 on the timing chart shown in FIG.
Correspond to the perforations P1, P2, P3, and P4 shown in FIGS. 6A to 6D, respectively. When the perforation P3 passes through the photo reflector 28, the value of PRCNT becomes # 6.

In the above step S97, PRCNT
Is not equal to # 6, the flow shifts to step S100, and the microcomputer 11 further sets the PRC
It is determined whether the value of NT is equal to # 8. here,
If the value of PRCNT is not equal to # 8, the process returns to step S95, and the processing after step S95 is repeated.

On the other hand, in step S100, P
If the value of RCNT is equal to # 8, step S101
Move to. In FIG. 6A, the perforation P4
Passes through the photo reflector 28, the value of PRCNT becomes # 8. At this time, steps S100 to S100
The processing shifts to 101.

The processing in step S101 corresponds to * 12 on the timing chart of FIG. This step S
At 101, the microcomputer 11 _{applies a} short brake to the motor (M1) 36 for a predetermined time (T _S2r ).

Subsequently, in step S102, the microcomputer 11 applies a positive voltage to the motor (M1) 36 for a predetermined time (T _Rr ). Further, in step S103, the motor (M) is set for a predetermined time ( _TS3r ).
1) The short brake is applied to 36.

As described above, the above steps S101 to S1
By the process of 03, the film 25 is completely stopped.
Thereafter, this subroutine ends, and the routine returns.
In addition, it is a control parameter of the motor (M1) 36.
_{Vm1r, Vm2r, T S1r, T} S2r, T S3r, T Rr should previously stored in the memory circuit 17. As a result, optimal parameters can be set according to the manufacturing characteristics of the film feeding mechanism 35.

As described above, even if two sensors for detecting the film perforation are not provided on the screen of one frame,
After detecting an unexposed frame of the partially exposed film, the film is returned by 2 frames and wound up by 1 frame, so that the film is wound up and stopped in the same direction as the normal winding direction. Feeding becomes possible, the cost of the camera can be reduced by the small number of sensors, and the space for installing the sensors is not required, which contributes to miniaturization.

Further, according to the above embodiment of the present invention,
The following configuration can be obtained. (1) Cartridge information detecting means for detecting information of a cartridge loaded in a camera, perforation detecting means for detecting perforation on a film in the cartridge, and winding of the film in response to an output of the perforation detecting means. Winding means for raising, rewind means for rewinding the film in response to the output of the perforation detecting means, signal detecting means for detecting data magnetically recorded on a magnetic recording layer on the film, and cartridge information When a signal is output from the detecting means, the film is wound by the winding means to a frame on which no data is recorded, based on the signal of the signal detecting means, and then at least two times by the rewinding means.
A film feeding device comprising: a frame rewinding device; and a control means for rewinding one frame and then rewinding the frame to find the unexposed frame.

(2) The film feeding apparatus according to the above (1), wherein the cartridge information detecting means outputs a signal when the loaded cartridge is partially exposed.

(3) Cartridge information detecting means for detecting information on the cartridge loaded in the camera, perforation detecting means for detecting perforations on the film in the cartridge, and the above-described means in response to the output of the perforation detecting means. Winding means for winding a film, rewinding means for rewinding the film in response to the output of the perforation detecting means, and signal detecting means for detecting data magnetically recorded on a magnetic recording layer on the film, When a signal is output from the cartridge information detecting means, a control sequence for winding up the film to a frame not magnetically recorded, rewinding at least two frames, and then winding up one frame again based on the output of the signal detecting means. Film comprising control means for inhibiting Feeding device.

(4) The film feeding apparatus according to (3), wherein the cartridge information detecting means outputs a signal when the loaded cartridge has not been exposed.

(5) The film feeding apparatus according to (3), wherein the cartridge information detecting means outputs a signal when all of the loaded cartridges have been exposed.

(6) The film feeding apparatus according to (3), wherein the cartridge information detecting means outputs a signal when the loaded cartridge has been developed.

(7) Cartridge information detecting means for detecting information on a cartridge loaded in a camera, perforation detecting means for detecting perforation on a film in the cartridge, and magnetic recording of data on a magnetic recording layer on the film. Data recording means for recording;
A signal detecting means for detecting data magnetically recorded on the magnetic recording layer on the film, and the film is wound by one frame in response to an output signal of the perforation detecting means, and data is recorded by the data recording means. A first one-frame winding unit, a second one-frame winding unit for winding the film by one frame in response to an output of the perforation detecting unit, and detecting data by the signal detecting unit; and a perforation detecting unit. Rewinding means for rewinding the film by one frame in response to the output, and when a signal is output from the information detecting means, the second winding means winds the film one frame at a time, and the output of the signal detecting means The winding is stopped in response to, and then at least two frames are rewound by the above-mentioned rewinding means, and further by the first winding means. A film feeder, comprising: a control unit that outputs a prohibition signal to the data recording unit when one frame is wound, and searches for an unexposed frame of the film.

(8) The film feeding apparatus according to the above (7), wherein the cartridge information detecting means outputs a signal when the loaded cartridge is partially exposed.

(9) The film feeding device according to (7), wherein the control means does not output a prohibition signal when the film is wound by the first winding means after photographing.

[0110]

As described above, according to the present invention, it is possible to set an unexposed frame even if a partially exposed film cartridge is loaded by using only one photoreflector for detecting perforation. A film feeder can be provided. According to the present invention, after detecting an unexposed frame, extra rewinding and driving in the winding direction to stop are performed, so that the sequence is the same as the winding sequence after normal shooting, so that the film stopping accuracy is improved. Then, Koma becomes stable.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a camera to which a film feeding device of the present invention is applied.

FIG. 2 is a perspective view of the film feeding mechanism 35 of FIG. 1 seen from behind the camera.

FIG. 3 is a diagram showing a configuration of a film 25 and a film cartridge 26.

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

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

FIG. 6 is a diagram showing a positional relationship between a film 25 and an opening 58.

FIG. 7 is a timing chart showing an operation when preparation for photographing is completed.

FIG. 8 is a flowchart illustrating a processing operation of a subroutine “winding one frame”.

FIG. 9 is a flowchart illustrating a processing operation of a subroutine “wind one frame”.

FIG. 10 is a timing chart illustrating a processing operation of a subroutine “winding one frame”.

FIG. 11 is a flowchart illustrating an operation of a subroutine “winding of magnetic recording detection”.

FIG. 12 is a timing chart for explaining an operation of a subroutine “winding of magnetic recording detection”;

FIG. 13 is a flowchart illustrating an operation of a subroutine “one frame rewind”.

FIG. 14 is a timing chart for explaining an operation of a subroutine “rewind one frame”;

[Explanation of symbols]

 Reference Signs List 11 microcomputer, 12 photometry circuit, 13 distance measurement circuit, 14 shutter control mechanism, 15 focus adjustment mechanism, 16 display circuit, 17 storage circuit, 18 release switch (RELSW), 19 rewind switch (REWSW), 20 power switch (PWSW) , 21 patrone detection switch (PTSW), 22 magnetic recording circuit, 23 magnetic detection circuit, 24 magnetic head, 25 film, 26 film cartridge, 27 take-up spool, 28, 30 photo reflector (PR), 29 bar code, 31 Photo interrupter (PI), 32 Disk with slit, 33 Signal processing circuit, 34 Drive circuit, 35 Film feeding mechanism, 36 Film winding / rewinding motor (M1), 51 Film feeding motor (M2), 58 Opening .

Claims (3)

[Claims] 1. A cartridge information detecting means for detecting information of a film cartridge including partially-exposed information; a feeding means for idling, winding and rewinding a film by driving a motor; and a film perforation accompanying the feeding A perforation detecting means for detecting the moving state of the film, and film information reading means for reading the recording information of each frame of the film, when the cartridge information detecting means determines that a partially exposed film cartridge is loaded, After the idle feeding, winding is performed while reading the above film information, winding is stopped at a frame having no record information, two frames are rewound from the position where the winding was stopped, and one frame is wound again to find the unexposed frame. Film feeding apparatus. 2. The film feeding apparatus according to claim 1, wherein said one system of perforation detecting means is disposed at a position enabling accurate frame position determination in the film winding direction. apparatus. 3. A cartridge information detecting means for detecting information of a loaded film cartridge, a winding means for winding up a film, a rewinding means for rewinding the film, and a movement of the perforation of the film is detected. , A perforation detecting means for locating an accurate frame in the film winding direction, and a film information detecting means for detecting data of a data recording section provided in each of the film frames, wherein the cartridge information detecting means When it is found that the film cartridge loaded by the bureau has been partially exposed, the film is wound up, the data in the data recording section of the film is detected, and the film is wound up with the first piece without data found. Stop, rewind two frames from the position where the winding was stopped, and wind another frame Film feed apparatus characterized by further the beginning of unexposed frame.