JPH07261255A - Data recorder for camera - Google Patents

Abstract

PURPOSE:To record data in a 1st frame by keeping unit bit length constant. CONSTITUTION:In the period when perforation formed on a film leading edge side further than the 1st frame is detected, encoding pulses generated every time a motor is rotated at a specified angle are counted. A factor K expressing relation between the generating cycle of the encoding pulses and the recording cycle of one bit of data is obtained from the length of the perforation and the number of the encoding pulses. Exposure control data is recorded in the magnetic recording layer of the 1st frame in the recording cycle decided based on the generating cycle of the encoding pulses and the factor K obtained at such a time. As for the 2nd and succeeding frames, the exposure control data is recorded in the magnetic recording layer of that frame by obtaining the factor K from the number of encoding pulses obtained until the perforation formed at the leading edge of that frame is detected after the perforation formed at the leading edge of the previous frame is not detected and the length to the leading edge from the trailing edge of the perforation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording device for a camera which records various data on a film when one frame of the film is fed.

[0002]

2. Description of the Related Art A photo film and its recording device are known which can record exposure control information such as shutter speed, aperture value, presence or absence of stroboscopic light emission, and print information such as trimming print. These pieces of information recorded on the photographic film are read in the print processing at the developing place and used for exposure control during printing and trimming print. The information can be recorded by either a magnetic recording method or an optical recording method, but digital recording is advantageous in order to eliminate recording errors and reading errors as much as possible.

In order to perform digital recording, digital data in which information is composed of a plurality of bits is used and is expressed by a combination of a magnetic area and a non-magnetic area of each bit or a combination of an exposed area and a non-exposed area. . The digital data is recorded at a position related to the frame, for example, beside the frame during the film feeding for one frame immediately after shooting one time. At this time, the recording length of each bit should be constant. is necessary. If the film feeding speed is always constant, the 1-bit recording cycle or reading cycle may be controlled with reference to the film feeding speed. By doing so, the recording time of 1 bit by the magnetic head or the light emitting diode is controlled according to the film feeding speed, so that the recording length of each bit can be made constant.

However, since the feeding and shutter charging are generally performed by one motor, the load on the motor changes during the feeding period of one frame, and the film feeding speed changes. Since this changing method is complicated and there are individual differences among cameras, it is difficult to record each bit by referring to the elapsed time from the start of feeding. To solve such a problem, the number of encode pulses generated each time the motor rotates by a predetermined angle is counted while feeding one frame, and the number of encode pulses and one frame of the film known in advance are counted. The relationship between the generation cycle of the encode pulse and the 1-bit recording cycle is obtained from the length of the minute and (the moving distance of the film when winding 1 frame), and the frame is set so that the 1-bit recording length is set from this relationship. About 1
There is a recording device for determining and recording a bit recording time or a recording cycle (for example, Japanese Patent Application No. 4-323448 proposed by the present applicant).

[0005]

By the way, in the above-mentioned method, 1 is applied to the first frame in which no previous frame exists.
The bit recording time or recording period is the number of encode pulses generated by one rotation of the motor obtained from the shape of the camera, the diameter of the spool for winding in the camera or the spool of the film cartridge, the gear ratio between this spool and the motor, The recording time or recording period of 1 bit is set in advance by using the length of one frame of the film or by combining the values experimentally obtained by the individual cameras. However, with the value set in this way, an error is likely to occur depending on the winding state of the film on the spool, it is not possible to accurately record the length of 1 bit, and the recording density deviates from the set value. There was a problem.

Further, in the case of a prewind type camera in which the film is first pulled out when the cartridge is loaded in the camera and the exposed film is sequentially wound on the spool in the cartridge, the spool diameter varies depending on the manufacturer or the individual. Therefore, there is a problem that the error in the length of 1 bit becomes large. Furthermore, in the case of a plurality of cameras of different models having different numbers of encode pulses generated by one rotation of the motor, gear ratio between the spool and the motor, and spool diameters, a 1-bit recording time or recording cycle was tested for each model. It was found from the theoretical value, and the data had to be changed according to the model, the same ROM and the like could not be used, and the production process could not be simplified.

The present invention has been made in consideration of the above problems of the prior art, and an object of the present invention is to provide a camera data recording apparatus capable of maintaining a constant write bit length for each bit. .

[0008]

The present invention has been made to achieve the above object, and corresponds to the first frame during the period of feeding the first frame having no previous frame to the photographing position. The first exposed frame is fed based on the length of one formed perforation and the number of encode pulses obtained in synchronization with the rotation of the motor while the perforation passes. The recording cycle for one bit when data recording is performed during this period is determined.

Further, instead of the length of one perforation formed corresponding to the first frame and the number of encode pulses obtained during the passage of this perforation, corresponding to the first frame The fixed length between the formed perforations and the number of encode pulses obtained in synchronization with the rotation of the motor during feeding of the fixed length, or the perforation formed corresponding to the first frame The exposure that has been performed based on either the fixed length defined by the interval and the length of the perforation or the number of encode pulses obtained in synchronization with the rotation of the motor during feeding of this fixed length. It is also possible to determine the recording cycle for 1 bit when data recording is performed during the feeding of the first frame.

[0010]

With respect to the first frame, when the first frame is fed to the photographing position, any one of the perforation length, the constant length between the perforations, the perforation interval, and the perforation length is selected. The data recording period is determined from the relationship between the known constant length of the frame and the number of encode pulses obtained in synchronization with the rotation of the motor while the constant length is fed by the first frame. At this time, one bit of data is recorded with a constant length.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 2 showing a film 1 and a cartridge 2, the film 1 is capable of photographing, for example, 36 frames, and one frame is exposed for each frame 3 _{1 to} 3 ₃₆ . On one edge of the film 1, a perforation 1a indicating the tip of each of the frames 3 _{1 to} 3 ₃₆ and a perforation 1b indicating the end of the film 3 _{1 to} 3 ₃₆ are provided, and the perforation 1a of the first frame 3 ₁ is provided in the vicinity of the film 1. A perforation 1c is provided on the tip side. A magnetic recording layer 4 is provided on the base surface at the other edge of the film 1. The rear end of the film 1 is attached to a spool 2a rotatably provided on the cartridge 2.

The size of each of the frames 3 _{1 to} 3 ₃₆ is defined, and the interval between the perforation 1 a and the perforation 1 b of the same frame, the perforation 1 b of each of the frames 3 _{1 to} 3 ₃₆ and the perforation 1 a of the next frame.
And the position and length of the magnetic recording layer 4 are defined. Further, the perforations 1a to 1c have prescribed lengths in the film feeding direction.

Referring to FIG. 3 showing a camera incorporating the data recording apparatus of the present invention, a film feeding motor 11 is incorporated in the take-up spool 10, and this motor 11 will be described in detail later by a command from the microcomputer 12. It is driven via the above-mentioned motor drive / magnetic recording control circuit 13. As is well known, the drive transmission mechanism 14 has a gear train and a clutch mechanism built therein. After the film is loaded, the drive transmission mechanism 14 is switched to a winding state by a switching signal from the microcomputer 12. When the motor 11 is driven by the input of the exposure completion signal for one frame, the motor 1
The driving force of 1 is the gear 11a, the drive transmission mechanism 14, the gear 15
Is transmitted to the take-up spool 10 via. When the take-up spool 10 rotates, the exposed portion of the film 1 is taken up on the outer periphery of the take-up spool 10, and at the same time, the unexposed portion of the film 1 is pulled out from the cartridge 2. When all frames are exposed, drive transmission mechanism 1
4 is rewound and the rotation of the motor 10 is changed to the gear 11
It is transmitted to the spool 2a provided in the cartridge through a, the drive transmission mechanism 14, the gear 16, and the fork 17. When this spool 2a rotates, the take-up spool 1
Film 1 from 0 is rewound into the cartridge.

When the cartridge 2 is loaded and the film is loaded, the leading end of the film 1 is engaged with the take-up spool 10. Then, for example, by closing the lid for loading the cartridge, the first frame signal (hereinafter, FFS signal) is input to the microcomputer 12. The microcomputer 12 sends a switching signal to the drive transmission mechanism 14, and the drive transmission mechanism 14
The film 1 is wound on the take-up spool 10 by switching to the winding state and rotating the motor 11, and the first frame 3 ₁ is set at a predetermined position. When the tip of the film 1 is engaged with the take-up spool 10,
The perforation 1c is located at a position before the photo sensor 18 described later in the feeding direction, for example, in the cartridge 2.
In this embodiment, the leading end of the film 1 is engaged with the take-up spool 10 in advance as described above. However, after the film is sent out from the cartridge or the film cartridge and engaged with the take-up spool. The first spool may be set at a predetermined position by rotating the take-up spool.

A reflection type photosensor 18 for detecting passage of the perforations 1a and 1b of the film 1 is disposed in the film passage for controlling the film 1 to be fed by one frame. The photo sensor 18 includes a phototransistor 18a and a light emitting diode 18b (see FIG. 4), and is turned on / off by a driver 18c controlled by the microcomputer 12. When the feeding of the film 1 is started, the photo sensor 18 is turned on and projects infrared light from the light emitting diode 18b below the film 1, and this light is perforated 1a, 1b, 1
When the phototransistor 18a receives the light reflected by the reflection plate provided in the camera via c, the photoelectric signal is output to the PF signal circuit 18d. This PF signal circuit 18d
Sends the PF signal to the microcomputer 12 as "L" when the photoelectric signal is flowing, that is, when the photosensor 18 detects the perforations 1a to 1c, and when the photosensor 18 does not detect the perforations 1a to 1c.

The microcomputer 12 detects the perforations 1a to 1c by monitoring the PF signal. The microcomputer 12 is a perforation 1 provided at the tip of the next frame after the film is fed.
When a is detected, a stop signal is sent to the motor drive / magnetic recording control circuit 13 to stop the motor 5 so that the photo sensor 18 faces both ends of the perforation 1a. Since the film 1 is provided with two perforations 1a and 1b for one frame, the PF signal that has detected the perforation 1a of the exposed frame is changed to "H" by the start of film feeding.
When the PF signal becomes “H” for the second time after turning to, it can be determined that the photosensor 18 has faced the perforation 1a of the next frame.

When the first frame 3 ₁ is set (hereinafter referred to as the first frame set) at the time of film loading, the PF is set by the perforation 1c.
When the PF signal becomes "L" due to the perforation 1a of the first frame 3 ₁ after the signal becomes "L" and then to "H", the motor 11 is stopped in the same manner as above.

Outside the frame of the exposure aperture 19 of the camera,
For example, the magnetic head 20 is provided on a film pressure plate (not shown). The magnetic head 20 magnetically records exposure control data such as a shutter speed and an aperture value on the magnetic recording layer 4 of the film 1 as a binary code. The microcomputer 12 is connected to a data ROM 21 that stores exposure control data as binary code data.

The program ROM 22 stores the above-described various sequences, a sequence program for performing magnetic recording control described later, and the like. And RA
The M23 is used as a work area for temporarily storing data necessary for performing the photographing sequence and the magnetic recording sequence. Further, the frame number counter 24 counts the number of frames of the film 1. Further, an LCD control circuit 25 is connected to the microcomputer 12, and this LCD
The control circuit 25 is controlled by the microcomputer 12,
An LCD (liquid crystal display) 26 attached to the back of the camera, for example, displays the number of shootable images of the film 1 and the type of film.

The film is wound after the final frame is photographed, and when the winding is completed, the drive transmission mechanism 14 is switched to the rewinding state by a switching signal from the microcomputer 12. As a result, the fork 17 rotates in the rewinding direction, and the film 1 that has been photographed is rewound into the film cartridge 2. Note that the completion of winding and the completion of rewinding can be determined based on the signal from the photo sensor 18.

An encoder 27 is attached to the motor 11. The encoder 27 is formed with radial and extremely fine slits on a disc, is connected to the rotation shaft of the motor 11, and is an encode plate 28 that rotates in conjunction with the rotation shaft.
And a photo interrupt 29 fixed to the camera side so that the encoder plate 28 is sandwiched between a photo transistor 29a and a light emitting diode 29b (see FIG. 4), and turned on / off by a driver 30 controlled by the microcomputer 12. To be done. The encoder plate 28 is the motor 1
It rotates with the rotation of 1, and the slit is the light emitting diode 2
After passing between 9b and the phototransistor 29a, the light projected from the light emitting diode 29b to the encode plate 28 is received by the phototransistor 29a through the slit. The phototransistor 29a outputs a photoelectric signal to the encode signal generator 31 when receiving the light passing through the slit. The encode signal generator 31 outputs an encoder pulse obtained by waveform-shaping the photoelectric signal. As a result, an encoder pulse is sent to the microcomputer 12 every time the motor 11 rotates by a certain angle. FIG. 4 shows the photo sensor 18, the encoder 27 described above, and actual circuits around them.

In FIG. 5, which shows the motor drive / magnetic recording control circuit 13, the motor driver 32 is controlled by the microcomputer 12 to drive the motor 11. The number of encode pulses input from the encode signal generator 31 is the count value Pc generated during the feeding of one frame.
Is counted by the microcomputer 12. Further, the generation cycle of the encode pulse is measured by the microcomputer 12. The generation cycle of this encode pulse is measured by counting the basic clock from the pulse generator 33 during the period from the input of one encode pulse to the input of the next encode pulse, and the multiplication is performed as the count value Tp. To the container 34.
This count value Tp is updated to a new one each time it is measured in sequence.

In the case of the first frame set, the microcomputer 12 determines the number of input encode pulses during the period in which the photo sensor 18 faces the perforation 1c and the PF signal due to this is "L". Count as a count value Ppc.

The microcomputer 12 calculates a coefficient K representing the relationship between the encode pulse generation period and the 1-bit recording period each time the first frame set is finished and the feeding of one frame is finished, and the next frame is fed. This coefficient K is sent to the multiplier 34 when it is sent. The multiplier 34 sends a value obtained by multiplying the count value Tp and the coefficient K to the timer 35 as the timer value Tw. This timer 35 uses a pulse generator 33.
Of the basic clocks, and a timing pulse is generated each time the timer value Tw is reached. This timing pulse is input to the AND circuit 36 connected to the shift enable terminal SE of the microcomputer 12. When the shift enable terminal SE is “H”, the pulse output from the AND circuit 36 is input to the shift register 37 as a shift pulse.

The shift register 37 stores each bit of the exposure control data output from the microcomputer 12 in a recording order, and shifts by one bit by a shift pulse. The shift register 37 sends the bit shifted to the final stage to the head driver 38. Head driver 38
Drives the magnetic head 20 with 1-bit data extracted from the shift register 37, and records a magnetic signal on the magnetic recording layer 4 of the film 1.

The operation of the data recording device for a camera constructed as described above will be described below. FIG. 1 shows the processing procedure for the first frame. The tip of the film 1 is engaged with the take-up spool 10, and the cartridge 2 is loaded into the camera. When the loading is completed, a short pulse FFS signal is input to the microcomputer 12. The microcomputer 12 determines the count value Ppc of the encode pulse.
Is reset to "0", and the encoder 27 is turned on via the driver 30 and the photosensor 18 is turned on via the driver 18c. After that, the motor driver 32 is controlled to rotate the motor 11. The rotation of the motor 11 is
It is transmitted to the take-up spool 10 via the gear 11a, the drive transmission mechanism 14, and the gear 15, and the take-up spool 10 rotates. The film 1 is wound on the take-up spool 10 and the film 1 is fed. When the motor 11 rotates, the encode plate 28 rotates, and a photoelectric signal is input to the encode signal generator 31 every time the motor 11 rotates by a predetermined angle, and the encode pulse is sent from the encode signal generator 31 to the microcomputer 12. To be

[0027] before the perforations 1 of the first frame 3 ₁
When c starts to face the photo sensor 18, the PF signal from the PF signal circuit 18d turns to "L" as described in FIG. The microcomputer 12 starts counting the count value Pp at the rising edge of the encode pulse from this point.
Increment c by 1. When the film 1 further moves, the photo sensor 18 no longer faces the perforation 1c, and the PF signal changes to "H", the microcomputer 12 stops counting the encoder pulses. The count value Ppc is perforation 1
c is the number of encoder pulses obtained while passing through the photo sensor 18. At the same time, the microcomputer 12
Causes the photo sensor 18 to stop the feeding of the film at a position facing the perforation 1a, and thus controls the motor dry 32 to decelerate the motor 11.

When the film is continuously fed and the perforation 1a of the first frame 3 ₁ starts to face the photo sensor 18, the PF signal turns to "L" again. When the PF signal becomes “L”, the microcomputer 12
A stop signal is output to the motor driver 32, and the motor 11 is stopped so that the photo sensor 18 faces between both ends of this perforation 1a. As a result, the first frame 3 ₁ is set behind the exposure aperture 19. The microcomputer 12 turns off the photo sensor 18 and the encoder 27, sets the value of the frame number counter 24 to 1, and displays on the LCD 26 that the first frame is set.

The microcomputer 12 obtains the coefficient K and stores it in the RAM 23. Here, the coefficient K is a coefficient representing the relationship between the generation cycle of the encode pulse and the 1-bit recording cycle. This coefficient K is updated every frame-by-frame advance, but when the first frame is set, it is obtained from the following equation (1).

[0030]

[Equation 1] K = m · Ppc / Lp

In the equation (1), m is the length of 1 bit of the data written in the magnetic recording layer 4, and Lp is the length of the perforation 1c in the feeding direction. The calculation method of the equation 1 will be described later.

When the release button is pressed, it is well known.
The shutter operates and the first frame 3 ₁Is exposed. Shi
When the shutter closes, the exposure completion signal is sent to the microcomputer.
6 is input. After the first frame set in Figure 7
Encoding pulse count as shown in the processing procedure
The value Pc is reset to "0". Shift enable end
The child SE becomes "H" and the head driver 38 is turned on.
It is said that In addition, the photo sensor 18 and the encoder 27
Turn on. The microcomputer 12 photographed
Top 3₁Exposure control data regarding shift register 37
Set to. Further, the microcomputer 12 is
, The coefficient K stored in the RAM 23 is extracted, and the multiplier 34
Set to.

After that, the motor 11 is rotated by a command from the microcomputer 12. The take-up spool 10 rotates, and the exposed first frame 3 ₁ is taken up by the take-up spool 10.
Wrap around the outer circumference. The encode pulse generated during the film winding is sent to the microcomputer 12,
This encoder pulse interval is the microcomputer 1
Measured by 2, its value is set in the multiplier 34. Further, from the time when the film 1 moves and the perforation 1a of the first frame 3 ₁ is no longer detected by the photo sensor 18 and the PF signal turns to “H”, the microcomputer 12 determines the number of input encoder pulses. Start counting.

As shown in FIG. 8, the multiplier 34 multiplies the coefficient K by the generation period Tp of the encode pulse and sets the multiplication result in the timer 35. This timer 35
Divides the basic clock from the pulse oscillator 33 by the value Tw (= K · Tp) and sends it to the AND circuit 36 as a pulse having a period Tw. Here, since the AND circuit 36 is in the active state, when the pulse from the timer 35 is input, this pulse is sent to the shift register 37 as a shift pulse. The shift register 37 sends the exposure control data to the head driver 38 bit by bit at each input timing of the shift pulse. This head driver 38 is
The magnetic head 20 is driven to magnetically record the exposure control data on a part of the magnetic recording layer 4 provided on the edge of the first frame 3 ₁ . Here, since the magnetic head 20 is driven in synchronization with the generation timing of the shift pulse, the recording length of 1 bit becomes constant.

The encoder 27 is always used during the film feeding period.
The photoelectric signal from is converted into an encode pulse by the encode signal generator 31 and output. The microcomputer 12 constantly measures the generation cycle of the encode pulse,
Each time the encode pulse is newly input, its value Tp
Is sent to the multiplier 34, a new value Tw is written from the multiplier 34 to the timer 35, this Tw is used as a 1-bit recording period, and the exposure control data is recorded bit by bit on the magnetic recording layer 4. In FIG. 8, the cycle T obtained first
p is Tp1, and the cycle Tp obtained next is Tp.
It is represented by p2 and Tp3.

When the photo-photo sensor 18 detects the next perforation, the PF signal turns to "H". At this time, the microcomputer 12 uses the perforation 1b provided at the rear end of the first frame 3 _1.
Therefore, the film winding is continued. After this, PF
When the signal turns to "L", the perforation 1a provided at the tip of the _second top 3 ₂ causes the photo photo sensor 18 to move.
It is judged that the face-to-face contact has started and the counting of the encode pulse is stopped. At the same time, this perforation 1a
The stop of the motor 5 is controlled so that the photo sensor 18 faces between both ends of the winding, and the winding is stopped. This allows
The second frame 3 ₂ is set behind the exposure aperture 19. Further, the head driver 38 is turned off and the shift enable terminal SE is set to "L". Further, the photo sensor 18 and the encoder 27 are also turned off. The microcomputer 12 updates the coefficient K using the count value Pc obtained at this time and stores it in the RAM 23.
The coefficient K at this time is calculated from the rear end of the perforation 1a of the first frame 3 _{1 to} the perforation 1a of the second frame 3 ₂ .
If the distance to the tip of is L, then it can be calculated by the following equation 2. This calculation method will be described later.

[0037]

[Equation 2] K = m · Pc / L

When the exposure of the second frame 3 ₂ is completed, an exposure completion signal is input to the microcomputer 12. First
Similar to the case of winding the top 3 ₁ , the count value Pc of the encode pulse is reset to "0", the shift enable terminal SE is "H", and the head driver 38, the photo sensor 18, and the encoder 27 are turned on. After setting the coefficient K in the multiplier 34, the motor 11 is rotated to
Piece 3 ₂ take-up spool 10 wound up, perform the film feed. The generation cycle of the encode pulse is constantly measured, and the value Tp obtained one after another is sent to the multiplier 34, and the timer 3
The value Tw is written in 5. At this time, after the first frame 3 ₁ is wound up, the coefficient K obtained from the equation 2 is set in the multiplier 34, and the value Tw is output to the timer 35. A shift pulse is generated at Tw that is updated one after another, and the exposure control data is recorded bit by bit on the magnetic recording layer 4 in the head driver 38. Since the magnetic head 20 is driven in synchronization with the generation timing of the shift pulse, the recording length of 1 bit becomes constant.

As will be described with reference to FIG. 6, the microcomputer 12 monitors the PF signal so that the photosensor 18 does not face the perforation 1a of the second frame 3 _{2 and then} moves to the perforation 1a of the third frame 3 _3. The count value Pc is the number of encode pulses obtained until the meeting is started. Third frame 3 ₃ perforation 1a
Then, the winding is stopped so that the photo sensor 18 faces each other. From the count value Pc obtained at this time, the coefficient K
Is obtained from the equation of Equation 2 and used when recording on the magnetic recording layer 4 of the third frame 3 ₃ . Thereafter, similarly, the coefficient K is obtained from the count value Pc obtained when winding the previous frame, and the 1-bit recording cycle Tw is sequentially updated by the coefficient K and the generation cycle of the encode pulse when winding the frame. Perform magnetic recording.

Next, the method of calculating the equations shown in equations 1 and 2 will be described. Assuming that the moving speed V of the film is V and the film winding diameter is d when the film is wound, the rotation cycle Ts of the take-up spool 10 can be expressed by the equation (3).

[0041]

[Formula 3] Ts = π · d / v

Therefore, the rotation cycle Tm of the motor 11
Is a value obtained by dividing the rotation cycle Ts of the take-up spool 10 by the gear ratio G between the take-up spool 10 and the motor 11, and can be expressed by the following Expression 4.

[0043]

[Formula 4] Tm = π · d / (v · G)

The generation period Tp of the encode pulse can be expressed by the following equation 5 using the encode pulse number b generated for each rotation of the motor 11.

[0045]

[Equation 5] Tp = π · d / (v · G · b)

Further, in order to record 1 bit with the length m in the film 1 having the moving speed v, the read cycle of the shift register 37, that is, the output value Tw of the multiplier 34 can be expressed by the following equation 6.

[0047]

(6) Tw = m / v

Coefficient K and encoding pulse generation period "T"
The value multiplied by “p” becomes the 1-bit recording period Tw, and therefore the formula 7 is obtained. If we rearrange the formula of Equation 7,
The coefficient K can be expressed as in Equation 8.

[0049]

[Equation 7] K · π · d / (v · G · b) = m / v

[0050]

[Equation 8] K = m · G · b / (π · d)

Here, perforation 1 of length Lp
The rotation speed Rs of the take-up spool 10 when c passes through the photo sensor 18 can be expressed by the following equation 9 when the take-up diameter at the time of passing is d1.

[0052]

[Formula 9] Rs = Lp / (π · d1)

Therefore, the rotation speed Rm of the motor 5 can be expressed as in the following Expression 10.

[0054]

[Formula 10] Rm = G · Lp / (π · d1)

Using the equation 10 and the encode pulse number b generated during one rotation of the motor 5, the number of encode pulses generated when the perforation 1c passes through the photosensor 18, that is, the count value Ppc, is given by the following equation 11
Can be expressed as

[0056]

[Equation 11] Ppc = b · G · Lp / (π · d1)

From the equation 11 and the above equation 8 in which d = d1,
The above-mentioned equation 1 can be obtained. When the first frame setting is completed, the count value Ppc is the number of encode pulses generated while the perforation 1c passes through the photo sensor 18, and the length Lp of the perforation 1c is predetermined and known. is there. Therefore, if magnetic recording is performed when the perforation 1c passes through the photosensor 18, an appropriate coefficient K for keeping the 1-bit recording length constant can be obtained during this period.

[Mathematical formula-see original document] In the equation 2, the length of the film 1 which is moved while the photosensor 18 faces the tip of the perforation 1a of the next frame from the rear end of the perforation 1a of the frame is L (perforation of the frame). If the length from the rear end of 1a to the front end of the perforation 1a of the next frame) and the winding diameter at this time are d2, the coefficient K can be expressed as in Expression 12 as in Expression 8 above. Further, the number of encode pulses generated during this period, that is, the count value Pc, can be expressed by the following expression 13 as in the case of the above expression 11.

[0059]

[Equation 12] K = m · G · b / (π · d2)

[0060]

[Equation 13] Pc = b · G · L / (π · d2)

Equation 2 can be calculated from these Equations 12 and 13. When the next frame is set,
The count value Pc is the perforation 1a of the frame.
The number of encode pulses generated during the passage of the photosensor 18 from the rear end of the perimeter of the next frame to the front end of the perforation 1a of the next frame, and the length L from the rear end of the perforation 1a of the adjacent frame to the front end is predetermined It is known because it is used. Therefore, 1 for the frame
An appropriate coefficient K can be obtained in order to keep the bit recording length constant.

However, at the time when the coefficient K obtained by the above equation 1 is obtained, magnetic recording is not performed, and the equation 2
When the coefficient K is obtained at, the data recording for the frame has ended. The optimum coefficient K for each frame changes as the winding diameter d changes with each winding, but when the perforation 1c passes through the photosensor 18 and when the first frame is wound.
Since there is little change in winding diameter between adjacent frames, the coefficient K is almost the same between them. Therefore, the number of encode pulses and the length of the perforation 1c while detecting the perforation 1c,
The coefficient K obtained from the recording length of 1 bit can be used when magnetic recording is performed on the first frame 3 ₁ . The coefficient K calculated from the number of encoder pulses when the previous frame is wound can also be used for the second frame 3 _{2 and} thereafter. As a result, for the first frame, it is possible to write a bit having a substantially constant length in the magnetic recording layer 4, and further, a coefficient K
The value of is updated to the optimum value every time when the film for one frame is finished to be wound up. Therefore, even after the second frame, the change of the winding diameter d is tracked so that the bit of almost constant length is recorded in the magnetic recording layer. 4 can be written.

According to this, when the first frame setting is performed, the coefficient K that correlates the rotation cycle of the motor, that is, the rotation cycle of the take-up spool and the recording cycle for recording one bit of data is given by Since it is determined as shown in the equation, even if the take-up spool has a different take-up diameter, the coefficient K corresponding to the take-up diameter of the take-up spool can be obtained by performing the above-mentioned procedure, and thus an appropriate value can be obtained. One bit can be recorded in the recording cycle. Therefore, even if the take-up spool diameters are different, if the same perforation length is set, data can be recorded at an appropriate recording cycle.

In the above embodiment, the exposed film portion is wound on the take-up spool on the camera side at every exposure from the frame on the leading end side of the film pulled out from the film cartridge. It can be applied to the prewind system in which all the films are once wound up on the take-up spool on the camera side, and the exposed film portions are sequentially exposed from the frame at the rear end of the film and the exposed film portions are wound up on the cartridge.

FIG. 9 shows a prewind type camera.
In the following description, as shown in FIG.
The first frame 3 ₁ is set from the rear end side. In this camera, the magnetic head 40 of the magnetic recording layer 4 is provided when the photo sensor 18 faces the perforation 1b located at the rear end of the next frame (the frame adjacent to the frame on the front side of the film 1). It is located at the rear end. For example, when the first frame 3 ₁ is set on the back surface of the aperture 19, the photosensor 18 faces the perforation 1b of the second frame 3 ₂ , and the magnetic head 40 is located behind the magnetic recording layer 4 of the first frame 3 _1. It is located on the edge. The motor drive / magnetic recording control circuit 13 has the same configuration as in FIG. 5, but in this camera, it is set in the shift register 37 in order to record data from the rear end side to the magnetic recording layer 4. The order of the exposure control data is reversed from that in the above embodiment, and the frame number counter 24 subtracts one from the total number of frames of the film 1 set in the first frame every time one frame is wound. The same parts as those in the above embodiment are designated by the same reference numerals.

As shown in FIGS. 10 and 11 for the first frame set procedure and FIG. 12 for the procedure after the first frame set procedure, the FFS signal is the microcomputer 1
2 is input, the count value Pp of the encode pulse is input.
c and the frame number counter are reset to "0". The photo sensor 18 is turned on to detect the movement of the film 1.
After setting to N, the motor 11 is rotated to wind the film 1 on the take-up spool 10. The microcomputer 12 monitors the PF signal to detect the perforation 1a,
Every time either one of 1b and 1c passes the photo sensor 18, the frame number counter is incremented by one. When the film 1 is wound up to the end portion 41 (see FIG. 13), the counting of the frame number counter 24 is finished, the motor 11 is stopped, and the film winding is finished. Whether or not the film is wound up to the terminal end portion 41 is determined by whether or not the next perforation 1a is detected within a predetermined time after detecting the perforation 1b.

When the end portion 41 of the film 1 is wound up, the perforation 1b provided at the rear end of the first frame 3 ₁ is wound on the left side of the photo sensor 18 in FIG. Become. The microcomputer 12 turns on the encoder 27 and then
The drive transmission mechanism 14 is switched to the rewinding state to rotate the motor 11. The rotation of the motor 11 depends on the fork 17
And the spool 2a is rotated in the film rewinding direction. The film 1 is wound around the outer periphery of the spool 2a, and the film 1 is fed in the direction of the cartridge.

As shown in FIG. 13, the microcomputer 12 monitors the PF signal and counts the number of encode pulses during the period of detecting the second perforation, that is, the perforation 1a at the tip of the first frame 3 _1. Then, this is set as the count value Ppc. From the moment this perforation 1a passes through the photo sensor 18, the rotation of the motor 11 is controlled so that the photo sensor 18 between both ends of the perforation 1b provided at the rear end of the _{second top} 32 faces the motor. Stop 11. Turn off the photo sensor 18 and the encoder 27,
The count value counted by the frame counter is displayed on the LCD 26.

The microcomputer 12 calculates and calculates the coefficient K and stores it in the RAM 23. Here, the spool 2a of the cartridge 2 is rotated by the rotation of the motor 11 transmitted by the gear train similarly to the take-up spool. Therefore, the generation period of the encode pulse and the recording of the magnetic recording are performed in the same manner as in the above-described embodiment. A coefficient K that correlates with the period can be obtained. Coefficient K is perforation 1
If the length of a is Le, then the equation 14 is obtained.

[0070]

[Equation 14] K = m · Ppc / Le

The value Le is the length of the perforation 1a.
This coefficient K is obtained because it is defined and known in advance.
be able to. First frame 3₁Exposure is completed and the first
Ma 3 ₁When winding the inside of the Patrone 2,
K and the period Tp of the encode pulse generated at this time
The multiplied value Tw is set as a 1-bit recording period, and the magnetic recording layer
Record the data in 4. Encoder cycle and magnetic recording
Since the recording period of recording can be related by the coefficient K,
The diameter of the pool 2a and the winding diameter at this time are the same as in the above embodiment.
For this reason, it is necessary to record with a fixed 1-bit recording length.
You can

Further, when recording data for the _{second and} subsequent frames 32, as shown in FIG. 13, the previous frame of the relevant frame (in contrast to the Nth frame, the previous frame is the N-1th frame in this case) When the photo sensor 18 is facing, the distance from the leading edge of the film 1 of the perforation 1b of the frame to the trailing edge of the film 1 of the perforation 1b of the next frame is obtained when The number of encode pulses to be generated and these perforations 1b
The coefficient K can be calculated from the length L and the interval L by the equation 2 in the above embodiment. Also in this case, the recording length of 1 bit can be fixed for recording for the same reason as in the above embodiment.

By doing the above, even if the diameter of the cartridge is different in the prewind type camera,
One bit of data can be recorded on the magnetic recording layer 4 of each frame with a constant recording length.

In the above embodiment, when the first frame is set, the space between AB of the perforations 1a at the tip of the first frame 3 ₁ shown in FIG. 13 is used. The coefficient K may be obtained by using the interval, BD, and CD.

[0075]

As described above, according to the data recording apparatus for a camera of the present invention, the first frame having no previous frame is exposed, and the data recording is performed for one bit. The recording cycle of is the length of one perforation formed corresponding to the first frame during the feeding of the first frame to the shooting position and the rotation of the motor during the passage of this perforation. The number of encode pulses obtained in synchronization, the constant length between the perforations formed corresponding to the first frame and the number of encode pulses obtained while feeding this constant length, the first frame Based on any combination of the constant length defined by the perforation interval and the perforation length formed corresponding to the eye and the number of encode pulses obtained during the delivery of this constant length. Since it is decided that the 1-bit recording period of the first frame is set in advance by a theoretical value or an experiment, the 1-bit recording period generated by the difference in the winding state of the film on the take-up spool is eliminated. It is possible to reduce the error in recording length and the error in recording density. Further, in the prewind type camera, the length of 1 bit can be accurately recorded even if the spool diameter of the cartridge is different. Furthermore, even if there are differences in the take-up spool diameter and gear ratio due to different camera models, different data for each model is not required for recording the first frame. It is possible to use a ROM or the like in which is stored.

[Brief description of drawings]

FIG. 1 is a flowchart showing a procedure of a first frame set.

FIG. 2 is an explanatory view showing a film and a cartridge.

FIG. 3 is a schematic diagram of a camera using the present invention.

FIG. 4 is a circuit diagram showing a photo sensor, an encoder, and peripheral circuits thereof.

FIG. 5 is a block diagram showing a configuration of a motor drive / magnetic recording control circuit.

FIG. 6 is an explanatory diagram showing a relationship between a PF signal and an encode pulse when a first frame is set.

FIG. 7 is a flowchart showing a procedure after the first frame setting.

FIG. 8 is a timing chart showing data recording.

FIG. 9 is a schematic diagram of a prewind type camera.

FIG. 10 is a flowchart showing a procedure of a first frame set by a prewind method.

FIG. 11 is a continuation of the flowchart showing the procedure of the first frame set by the prewind method of FIG. 10;

FIG. 12 is a flowchart showing a procedure after a prewind type first frame setting.

FIG. 13 is an explanatory diagram showing a relationship between a PF signal and an encode pulse when a prewind type first frame is set.

[Explanation of symbols]

1 Film 1a, 1b, 1c Perforation 2 Patrone 2a Spool 3 _{1 to} 3 ₃₆ Frame 4 Magnetic recording layer 10 Winding spool 11 Motor 12 Microcomputer 13 Motor drive / magnetic recording control circuit 18 Photo sensor 20, 40 Magnetic head 27 Encoder

Claims (3)

[Claims] 1. A photographic film having a fixed number of perforations formed for each photographed frame is used to detect the passage of the fixed number of perforations and feed one frame of an exposed frame. During this one-frame feeding, the number of encode pulses obtained in synchronization with the rotation of the film feeding motor is counted, and the feeding period of the next frame is calculated based on the number of these encoding pulses and the feeding length of one frame. In a data recording device for a camera configured to determine a recording period for 1 bit when data is recorded during recording, a first frame having no previous frame is fed to the shooting position during the first frame. Based on the length of one correspondingly formed perforation and the number of encode pulses obtained in synchronization with the rotation of the motor during the passage of this perforation, Camera data recording apparatus characterized by determining a recording period for one bit when performing data recording during for feeding first frame became light already. 2. A photographic film having a fixed number of perforations formed for each frame is used to detect the passage of the fixed number of perforations and feed one frame of an exposed frame. During this one-frame feeding, the number of encode pulses obtained in synchronization with the rotation of the film feeding motor is counted, and the feeding period of the next frame is calculated based on the number of these encoding pulses and the feeding length of one frame. In a data recording device for a camera configured to determine a recording period for 1 bit when data is recorded during recording, a first frame having no previous frame is fed to the shooting position during the first frame. Exposed based on a fixed length between correspondingly formed perforations and the number of encode pulses obtained in synchronization with the rotation of the motor during feeding of this fixed length. Camera data recording apparatus characterized by determining a recording period for one bit when performing data recording during the feeding is the first frame was. 3. A photographic film in which a fixed number of perforations are formed for each photographed frame is used to detect the passage of the fixed number of perforations and feed one frame of the exposed frame. During this one-frame feeding, the number of encode pulses obtained in synchronization with the rotation of the film feeding motor is counted, and the feeding period of the next frame is calculated based on the number of these encoding pulses and the feeding length of one frame. In a data recording device for a camera configured to determine a recording period for one bit when data is recorded in a recording medium, the data is formed in correspondence with the first frame during a period in which the first frame is fed to a shooting position. The constant length defined by the perforation interval and the perforation length, and the encoding pulse obtained in synchronization with the rotation of the motor while feeding the constant length. Based on the number, the camera data recording apparatus characterized by determining a recording period for one bit when performing data recording first frame during which feeds became exposed.