JPH06175210A - Information recorder for camera - Google Patents

Abstract

PURPOSE:To keep a unit bit length constant and to record data on a film, without using an encoder for detecting the feeding speed of the film. CONSTITUTION:The film 2 is wound in a direction opposite to the feeding direction of a frame for a specified time after a perforation 2b located in the end of the front frame is detected or untill a perforation 2a located in the top of the front frame is detected. The winding of the film is stated therefrom and feeding speed is kept constant untill the perforation 2b of the front frame is completed to pass. The passing of the perforation 2b of the front frame and that of the perforation 2a of the frame are detected by a photosensor 21, the feeding speed of the film 2 is obtained from the time interval of the passing and the period of a synchronizing pulse for writing is calculated to obtain a timing pulse required for driving a magnetic head 30.

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 Exposure control data such as shutter speed and aperture value at the time of shooting, presence or absence of stroboscopic light emission, trimming data set by a user at the time of shooting, etc. are recorded in a film, and these writing data are printed. At the same time, attempts have been made to read it and use it for exposure control and trimming during printing. In order to write such data on the film being fed, either a magnetic recording method or an optical recording method can be used, but digital recording is advantageous in order to eliminate writing errors and reading errors as much as possible. In order to perform digital recording, write data may be represented by a binary code of a plurality of bits, and the binary code may be represented by a combination of a magnetized area and a non-magnetized area or a combination of an exposed area and a non-exposed area.

When data is written in the binary code on the film being fed as described above, the data written in the binary code on the film is the write bit length for each bit constituting the binary code. Must be constant for the to be read accurately. If the film feeding speed is always constant, a method for writing a binary code with each bit length kept constant by simply driving a recording means such as a magnetic head or a light emitting diode based on this film feeding speed, A method of recognizing and recording the feeding length of the film with reference to the time from the start of feeding can be considered, but generally when feeding one frame, the feeding speed of the film is It is not constant, and the way the speed changes varies depending on various conditions, and there are large individual differences. Therefore, in order to keep the write bit length for each bit forming the binary code constant, for example, slits are formed at a fine radial pitch on a disc that rotates in synchronization with the feeding of the film. An encoder is used to photoelectrically detect the passage of the slit with a photo interrupter, etc., and the film feeding speed is detected by the number of passing slits per fixed time, or the feeding length of the film is detected by the number of passing slits. In addition, in the case of a film in which a large number of perforations are present in one frame at even intervals, a photosensor that monitors reflected light while irradiating infrared light or the like is used to detect passage of the perforation. The feeding speed or feeding position of the film is detected, and the drive of the recording means is controlled based on these detection signals. .

[0004]

However, in the case of a film having two perforations for frame positioning on one edge and an information recording section on the other edge, which has been devised previously, Before the binary code is written to the information recording section of the film, the only method is to measure the time interval at which the perforations at the leading and trailing ends of the frame or the perforations at the trailing end and the leading end of the next frame cross the photo sensor. It is impossible to set the drive control information of the recording means for keeping the write bit length for each bit forming the base code constant.
Further, if the drive of the recording means is controlled by the method using the encoder and the photo interrupter as described above, the encoder and the photo interrupter need to have a high degree of accuracy to some extent, and it is difficult to save space and cost.

The present invention has been made to solve the above-mentioned problems of the prior art. In a film having two perforations for frame positioning on one edge,
The drive control information of the recording means for maintaining a constant write bit length for each bit constituting the binary code can be set before writing the binary code into the information recording section of the film, and An object of the present invention is to provide an information recording device for a camera, which does not use an encoder that is interlocked with feeding, and which has a low cost.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention reverses the motor after photographing and feeds the film by a predetermined length in the direction opposite to the one-frame feeding, and then the motor rotates in the normal direction. Then, the data is written while sending the film. When the film is fed by a predetermined length in the direction opposite to the one-frame feeding, it may be determined based on the time for driving the motor in the reverse direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 schematically showing the basic construction of the present invention, a film winding motor 13 is built in a take-up spool 12, and a motor driver 16 is operated by a command from a microcomputer 4. Driven by. The drive transmission mechanism 17 switches and transmits the drive force of the motor 13 to the take-up spool 12 for winding up or the fork 37 for rewinding in response to a command from the microcomputer 4. The motor 13 rotates the take-up spool 12 via the drive transmission mechanism 17 to move the film 2 in the direction in which the film is wound up, ie, the forward rotation, which is the rotation of the shaft of the motor 13, and vice versa, via the drive transmission mechanism 17. Rotation of the fork 37 to rewind the film 2 into the cartridge 38 in the direction of returning the frame can be performed in two directions of reverse rotation, which is rotation of the shaft of the motor 3, by a command from the microcomputer 4 to the motor driver 16.

As shown in FIG. 2, the film 2 is provided with a perforation 2a at the tip of each frame and a perforation 2b at the end of each frame at one edge of the film, and at the other edge. A magnetic data writing area 36 is provided. Further, a virtual 0th frame 6 is provided before the first frame of this film, and perforations 2a and 2b are provided like other frames. 3 to 4 perforations 2c at the tip of the film 2
Are provided side by side, but this is the take-up spool 12
This is for locking the tip of the film 2 to the claw of the film. As described with reference to FIG. 3, each frame also defines the interval between the perforation 2a and the perforation 2b of the same frame, and the interval between the perforation 2b of each frame and the perforation 2a of the next frame. further,
The position and length of the magnetic data writing area 36 are also defined.

In FIG. 1, a reflection type photosensor 21 for detecting passage of the perforations 2a and 2b is used for the one frame fixed length feeding control of the film 2 and for detecting the film feeding speed and the film position. There is.
When the film winding or the film rewinding is started, the photo sensor 21 monitors the reflected light while irradiating the film 2 with infrared rays. And the photo sensor 2
When the perforation 2a or 2b is detected by 1, the PF pulse is sent from the perforation signal generator 22 to the microcomputer 4.

In response to a command from the microcomputer 4, the drive transmission mechanism 17 is switched to hoisting, and the motor 13
When is rotated forward, the driving force is transmitted to the take-up spool 12 and the film 2 is taken up by the take-up spool 12. The film loading is started and the photo sensor 21 detects the perforation 2a of the 0th frame and sends a PF pulse from the perforation signal generator 22 to the microcomputer 4. After that, the microcomputer 4 outputs the PF of the perforation signal generator 22 when the photo sensor 21 detects the perforation 2b of the 0th frame 6.
The motor 13 is decelerated immediately after receiving the pulse, and the motor 3 is instantaneously stopped when the photosensor 21 detects the perforation 2a of the first frame. As a result, the first frame is set within the frame of the exposure aperture 29 of the camera. It is also possible to confirm whether the film loading is appropriate or not by monitoring the passage of the perforation 2c at the time of film loading with the photo sensor 21 and determining whether or not an intermittent PF pulse is obtained within a predetermined time.

Further, outside the frame of the exposure aperture 29, a magnetic head 30 for recording data is provided on the same axis as the photo sensor 21 which makes an angle of 90 degrees with the feeding direction of the film 2. This magnetic head 30 is driven by a writing circuit 31 when the film is wound up, and data such as exposure control data such as shutter speed and aperture value used at the time of photographing is magnetically recorded as a binary code in a magnetic data writing area 36 of the film 2. can do. Therefore, the microcomputer 4 receives the exposure control data 2
The data ROM 32 stored as the decimal code data is connected.

The program ROM 33 stores a sequence for controlling the motor 13 and the drive transmission mechanism 17 described above, a sequence program for performing data writing control described later, and the like. The RAM 34 is used as a work area for temporarily storing data necessary for performing the shooting sequence and the data writing sequence. Further, the frame number counter 35 counts the number of photographed frames of the film. After the exposure is completed, when the preset number of photographable images of the film 2 and the value of the photographed frame counter 35 coincide with each other, a data writing process described later is performed, and then the drive transmission mechanism 17 is rewound by a command from the microcomputer 4. , The motor 3 is rotated in the reverse direction, the driving force is transmitted to the fork 37, and the film 2 is placed in the cartridge 38.
Is wound up by the fork 37. The completion of rewinding can be detected based on the signal from the photo sensor 21.

The data recording function of the camera configured as described above will be described below. FIG. 4 shows the exposure completion signal and P when the drive transmission mechanism 17 is switched for winding by the camera and one frame is fed immediately after exposure.
This shows changes in the generation timing of the F pulse and the feeding speed. When an exposure completion signal is input to the microcomputer 4, the motor 3 is rotated in sequence to wind the film, and the first P by the perforation 2b is performed.
When the F pulse is obtained, the motor 3 starts decelerating, and when the second pulse by the perforation 2a is obtained, the motor 3 is instantaneously stopped and the next frame is set within the frame of the exposure aperture 29.

The feeding speed is gradually increased immediately after the start of winding because a large load is applied to the motor 3, and after a time ΔS1 from the start of winding, the load of the motor 3 becomes constant and the feeding speed becomes substantially constant. Time after the feeding speed becomes constant Δ
After S2, a PF pulse is generated and the feeding speed decreases, and the feeding speed becomes 0 when the next PF pulse occurs. In this case, a synchronizing pulse for data writing is created based on a clock pulse from the microcomputer 4 during the period of ΔS2 in which the feeding speed becomes constant, and the synchronizing pulse is used for the magnetic head 30.
, The bit length can be kept constant.

However, for ΔS1, the film is forked 37
It changes under various conditions such as the resistance received from the motor, the moment of inertia of the film itself, the voltage of the driving power source of the motor 3, and the like. Further, when the filming diameter of the film 2 wound around the winding spool 12 becomes thicker as the photographing progresses, the feeding speed of the film 2 changes so as to become faster. When trying to write data, if the writing is started after ΔS1, the feeding speed is almost constant, so that the 1-bit area length of each bit can be made equal, but the writing start time is surely set to the area of ΔS2 where the feeding speed is constant. It is necessary to enter the data, and it is necessary to set the start time of data writing longer than the expected ΔS1, the area where data can be written becomes short, and the amount of data that can be written becomes small.

Further, in this case, it is necessary to preset the period of the write sync pulse, set the 1-bit area length of each bit to be the same for accurate reading, and define the maximum amount of data that can be written in the recording section. Therefore, since it is necessary to make the 1-bit area length of each bit equal in each frame, it is necessary to know the feeding speed of each frame before writing. However, it is impossible to set the feeding speed as a known one for the above reason as well. The feeding speed becomes faster each time the frame is wound, and the feeding speed that changes under various conditions can be obtained at the time of feeding. It is impossible to obtain from the PF pulse before writing data.
It is difficult to set the cycle of the write synchronization pulse for each bit before writing the data.

Therefore, according to the present invention, basically, as shown in the flow charts of FIGS. 5 and 6 and the timing chart of FIG. 7, basically, after the exposure is completed, the film is temporarily moved in the opposite direction to the predetermined position or the predetermined time. The frame feed is performed from that position, the feeding speed of the film is made constant before the magnetic data writing area 36 and the magnetic head 30 face each other, and at the same time, the perforation 2b of the previous frame of the frame in which the data is written and the perforation of the frame. 2a
The feeding speed is calculated from the time interval of the PF pulse that detected
The setting of the sync pulse for driving the magnetic head 30 and the write start time are determined from the feeding speed. An electric block diagram of a writing circuit for that purpose is shown in FIG.

In FIG. 8, the perforation timer 41 connected to the microcomputer 4 is a perforation 2
It is for measuring the time after the detection of b.
The microcomputer 4 can take the timed value by measuring the time with the basic clock output from the microcomputer 4.
Further, the microcomputer 4 can reset the perf timer 41. The write timer 43 connected to one end of the input of the logical product circuit 44 is clocked by the basic clock output from the oscillator 42, the value Q is set by the microcomputer 4, and the synchronizing pulse for writing data having this value Q as a cycle. Is output.

The sync pulse from the write timer 43 is output from the AND circuit 44 only when the shift enable signal output from the microcomputer 4 and input to the other end of the input of the AND circuit 44 is "1". The initial setting of the shift enable signal is "0". The shift register 45 to which the write data is set in advance from the microcomputer 4 uses the sync pulse output from the AND circuit 44 as a shift clock for the head driver 47.
Send data to. The head driver 47 for driving the magnetic head 30 is turned on / off by the microcomputer 4.
It can be turned off, and only when it is turned on, the magnetic head 30 can be driven at the timing of the data sent from the shift register 45 to record in the magnetic data writing area 36.

Upon detection of the exposure completion signal, the write counter 46 causes the microcomputer 4 to output the counter value Nc.
Is reset to 0 (Nc ← 0), and the magnetic head 30 increases the value of the counter by 1 pulse of the synchronization pulse output from the logical product circuit 44, thereby causing the magnetic head 30 to write the magnetic data writing area 3
The number of data written in 6 is counted. The write counter 46 can pass the value of the counter to the microcomputer 4.

When the exposure of the frame is completed and the exposure completion signal is input to the microcomputer 4, the procedure of the present invention is switched so that the driving force is transmitted to the fork 37 by the drive transmission mechanism 17, and the motor 3 is rotated in the reverse direction. To start. The film 2 is rewound into the cartridge 38. When the perforation 2b of the previous frame is detected, the timer value ΔT of the perforation timer 41 is reset (ΔT ← 0).
The timer value ΔT becomes a certain value (ΔT ≧ Trmi
n) or before detecting the perforation 2a of the previous frame, the motor 3 is stopped and the drive transmission mechanism 17 is switched for winding, and the motor 3 is rotated in the forward direction. The winding on the take-up spool shaft 12 is started.

After the start of winding, when the perforation 2b of the previous frame is detected, the timer value ΔT is reset again (ΔT ← 0). When this perforation 2b is detected, the load applied to the motor 3 is constant because the length of one frame has already been fed, and the feeding speed of the film is almost constant. Next, the timer value ΔT at the time when the perforation 2a of the frame is detected is loaded into the microcomputer 4 as the timer value T1.
This timer value T1 is the time from when the photosensor 21 faces the perforation 2b of the previous frame until it faces the perforation 2a of the frame. When the distance between the perforation 2b of the previous frame and the perforation 2a of the frame is De as shown in FIG. 3, the average feeding speed Vba of the film at this distance De can be expressed by the following formula 1.

[0023]

## EQU1 ## Vba = De / T1

The length of the magnetic writing area 36 is shown in FIG.
As described above, in order to write N-bit data in the magnetic data writing area 36, the length Du of the area representing 1 bit can be expressed by the following Expression 2.

[0025]

(2) Du = Dm / N

Furthermore, if the film feeding speed maintains the average feeding speed Vba at the time of writing the data, the period of the synchronizing pulse necessary for writing the data becomes a value obtained by dividing the expression 2 by the expression 1. This value is written in the write timer value Q of the write timer 43 as the cycle value of the sync pulse. Q
Can be expressed as the following Expression 3.

[0027]

[Expression 3] Q = (Dm · T1) / (De · N)

As shown in FIG. 3, the head position MP of the magnetic data writing area 36 is located at a distance Di from the position of the perforation 2a of the frame, and if the average feeding speed Vba is maintained, When the timer value ΔT of the perforation timer 41 reaches the time Tmp obtained by dividing the distance obtained by adding the distance De and the distance Di as shown in the equation 4 by the average feeding speed Vba, the magnetic head 30 writes the magnetic data writing area 36. It becomes possible to write data relative to the head position MP of.

The timer value ΔT of the perforum timer 41 is Tm.
When it reaches p, the head driver 47 is turned on, the shift enable signal is set to "1", and the binary coded exposure control data set in advance in the shift register 45 is passed through the head driver 47 to the magnetic head. At 30, the writing is started from the head position MP of the magnetic data writing area 36. Since the feeding speed of the film is substantially constant and the magnetic head 30 writes each bit of data in the cycle Q, the length of the area representing one bit of each bit of data is made equal in the magnetic data writing area 36. Is recorded.

[0030]

[Equation 4] Tmp = T1 · (1 + Di / De)

The write counter 46 is reset (counter value Nc ← 0) when the exposure completion signal is generated. Since the number of data output from the shift register 45 is equal to the counter value Nc from the time when the shift enable signal becomes "1", the data to be written is written when the counter value Nc reaches the number N of all data. become. At this point, turn off the head driver 47,
The shift enable signal is set to "0" to end the write operation.

However, the counter value Nc is the total number N of data.
When the microcomputer 4 receives a PF pulse that occurs next before it becomes equal to, the feeding speed becomes higher than the calculated average feeding speed Vba for some reason and the frame concerned is written before all the data is written. The perforation 2b at the end of is facing the photo sensor,
This means that the magnetic head 30 faces the end of the frame. Therefore, in the magnetic head 30, some write data of the frame cannot be written in the magnetic data write area 36. Further, it is considered that the area length representing one bit of each bit of the data has also become long. In this case, error processing described later is performed.

If the writing of data is completed before the perforation 2b of the frame is detected, the film 2 is continuously fed to the perforation 2 of the frame.
The perforation timer value ΔT when b is detected is set to the timer value T
2 is taken into the microcomputer 4.

The difference between the timer value T2 and the timer value T1 is the time from when the perforation sensor 21 faces the perforation 2a of the frame until it faces the perforation 2b of the frame, and as shown in FIG. Assuming that the distance between the perforation 2a of No. 2 and the perforation 2b of the frame is the distance Ds, the average feeding speed Vab of the film at the distance Ds can be expressed by the following Equation 5.

[0035]

Vab = Ds / (T2-T1)

Since the average feeding speed Vab is an average feeding speed value including the period in which the magnetic head 30 is writing in the magnetic data writing area 36 of the frame, writing is performed in order to predict the writing speed. It is expected to be equal to the previously measured and calculated average feed rate Vba. However, if the speed fluctuates for some reason, it takes a different value. Here, the speed fluctuation is evaluated by the evaluation value EST obtained by dividing the average feeding speed Vab at the time of writing represented by the following Expression 6 by the average feeding speed Vba at which the feeding speed at the time of writing is predicted.

[0037]

[Equation 6] EST = Ds · T1 / (De · (T2-T1))

If there is no change in speed, the evaluation value EST
However, other than that, it is considered that the feeding speed is changed from the average feeding speed Vba and the length Du of the area representing one bit of the written data is changed for some reason. For example, if the error of the length of the area representing 1 bit of data is allowed up to ± 20%, the upper limit value E of the evaluation value EST
STmax is 1.2, the lower limit ESTmi of the evaluation value EST
n becomes 0.8, and if the evaluation value EST is between these values, it is determined that the writing has been normally performed, the motor 3 is immediately decelerated, and the perforation 2a of the frame next to the frame is detected. At this time, the motor 3 is stopped, the photographing of the frame and the writing of data are completed, the next frame is taken as the frame next to the frame, and the next photographing is performed, and the procedure returns to the first procedure of the present embodiment. Also, the evaluation value EST is EST
If it exceeds max or is less than ESTmin, error processing described later is performed.

Error processing when an error occurs during the above procedure will be described. The error counter value is reset to 0 when the exposure completion signal is generated. When an error occurs and error processing is started, the error counter value is incremented by 1. Next, the allowable number of error times is set to, for example, 10
If the number of times is 10, the error counter value exceeds the allowable number of times 10, and it means that rewriting has already been performed 10 times, and there is a possibility that writing will be performed correctly even if writing is performed more times. Is determined to be low, the warning means (not shown) informs the user that the writing could not be performed correctly, and ends.

If the error counter value is 10 or less, the motor 3 is stopped, the drive transmission mechanism 17 is switched to rewinding, and the motor 3 is rotated in the reverse direction. When it is confirmed that the photosensor 21 faces the perforation 2a of the frame, the procedure returns to the procedure of detecting the perforation 2b of the previous frame after receiving the exposure completion signal of this embodiment and starting the reverse rotation, and the subsequent steps are performed.

According to these procedures, the magnetic data writing area 36 of the film 2 has the information of the exposure control data as a binary code in which the length of each bit area is equal, and each bit of each frame of the film 2 has the information. A film having binary code information having a common area length can be obtained. When the error counter value becomes 1 or more and writing is performed again in the magnetic data writing area 36, the voltage or duty ratio for driving the motor 3 is set so as to make the film feeding speed close to an ideal value by the evaluation value EST value. If it is controllable, the duty ratio may be changed.

If the evaluation value EST exceeds ESTmax, the voltage or duty ratio is lowered, and if the evaluation value EST is below ESTmin, the voltage or duty ratio is raised, and correct writing can be performed. . Furthermore, the perforation 2b of the frame
Is not necessarily the end position of the magnetic data writing area 36, the magnetic head 30 may continue to write data while deviating from the magnetic data writing area 36 before the photo sensor 21 detects the perforation 2b of the frame. Although possible, it can be avoided by setting the upper limit value ESTmax of the evaluation value EST low.

In the embodiment described above, the perforation is optically detected for the positioning of the frame, but this may be changed to a magnetic detection method. In the present invention, there is a perforation at the leading edge and the trailing edge of one frame on one edge of the film and a magnetic data writing area on the other edge, but the present invention is not limited to this and a plurality of perforations per frame. The position of the perforation and the magnetic data writing area, such as the film where there is a perforation on both sides and the magnetic data writing area exists between the frame and the perforation, and the magnetic data writing area exists on the frame in the transparent magnetic data writing area. If is specified, it is possible to appropriately set it as the distance information of the film based on that information, count the perforations, and use it at a necessary timing.

[0044]

As described above, according to the information recording apparatus for a film of the present invention, after filming, the film is temporarily returned to a predetermined position or for a predetermined time in the direction opposite to the frame feeding direction,
After that, information is written at the same time when the information recording head faces the arbitrary position where the information is to be written and is written at the same time when the information is written in the frame feeding direction. Information can be set, and the write bit length for each bit forming the binary code can be kept constant. Further, when the data is not correctly written, the film can be rewound and the information writing can be repeated on the frame, so that the phenomenon that the film feeding is completed without recording the information can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing main components of a camera used in the present invention.

FIG. 2 is a plan view showing a photographic film used in the present invention.

FIG. 3 is an explanatory view showing dimensions of a main part of the photographic film shown in FIG.

FIG. 4 is a timing chart when the film is fed immediately after the exposure is completed.

FIG. 5 is one of two flowcharts showing the procedure of the embodiment.
It is the first piece.

FIG. 6 is a flow chart showing two steps of a flow chart showing the procedure of the embodiment.
It is the first piece.

FIG. 7 is a timing chart when winding is performed after rewinding.

FIG. 8 is an electrical block diagram used in a writing circuit.

[Explanation of symbols]

 2 film 2a, 2b Perforation 21 Photosensor 30 Magnetic head 36 Magnetic data writing area

Claims (1)

[Claims] 1. An information recording apparatus for a camera, wherein data is recorded on a film while the motor is rotated in the forward direction to feed the film one frame at a time. An information recording device for a camera, wherein the data is written for a predetermined length, and then the motor is normally rotated to feed the film.