JP2880851B2 - Binary data recording method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binary data recording method and apparatus for optically recording a binary code on a photographic film.

[0002]

2. Description of the Related Art Exposure control data such as a shutter speed and an aperture value at the time of photographing, the presence / absence of strobe light emission, and trimming data set by a user at the time of photographing are recorded on a film, and these write data are printed. Attempts have been made to read and use it for exposure control and trimming during printing. In order to write such data on the film being fed, it is convenient to perform optical recording using the photosensitivity of the film itself, and to minimize writing and reading errors by using digital recording. Recording is advantageous. To perform digital recording, the 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 an exposed area and a non-exposed area. Generally, such an optical record is
This is performed by incorporating a light-emitting element such as an LED in the camera, controlling the blinking of the light-emitting element every time the film is fed by a unit bit length, and recording a plurality of bits of binary data out of the shooting screen in a band. .

FIG. 15 shows an example of a camera data recording device using an LED array as a light emitting element. On the front surface of the recording head 2, there is provided an LED array 2 a in which several LEDs are vertically arranged so as to be orthogonal to the feeding direction of the film 3, and face the outside of the effective screen of the film 3. When the recording head 2 is driven through the microcomputer 4 and the LED driver 5, the LED array 2a is turned on. The image of the LED array 2a is reduced and formed on the rear surface of the film 3 by the projection lens 6. Therefore, by controlling the LED array 2a to blink in units of a unit bit length in synchronization with the feeding of the film 3, binary positions consisting of a plurality of bits of binary data are located at positions deviating from the photographing effective screen 3a of the film 3. Code 7 is written as a latent image.

In order to accurately record the binary code 7, it is necessary to keep the recording length (unit bit length) for each bit position constant. Therefore, as shown in FIG.
An encoder 10 including an encoding plate 8 and a photo interrupter 9 is used. A slit is formed radially in the encoding plate 8 and the slit pitch is
Corresponds to the rotation angle when the unit bit length is fed. Accordingly, an encode pulse (ENC pulse) can be obtained from the photo interrupter 9 which photoelectrically detects the passage of the slit every time the film 3 is fed by the unit bit length. If the drive control of the recording head 2 is performed, the binary code 7 can be recorded while maintaining a constant unit bit length in principle.

[0005]

However, since a relatively simple optical system such as a plastic lens is generally used for the photographic lens 6 in general,
The image of the LED array 2a formed on the film surface is spread. Therefore, the recording start position in each bit position is adjusted in consideration of the spread of the image, and the ENC pulse obtained every time the film 3 is fed by the unit bit length L as shown in FIG. (Pulse period T0) and the LED array 2
Even if the blinking control of a is performed, at the bit position where the LED array 2a is turned on, the recording pattern reaches the next bit position. For this reason, the unit bit length becomes longer by ΔL at the bit position where exposure is performed as binary data, and the unit bit length becomes shorter by ΔL at the next bit position to be unexposed. When the unit bit length fluctuates in this way, there is a problem that an error is likely to occur when reading a binary code in which these are combined.

In order to avoid such adverse effects, an optical system having a high imaging performance may be used as the photographic lens 6 so that the image of the LED array 2a is not spread on the film surface. However, such an optical system is very expensive. It is. Further, if the focal length of the photographic lens 6 is increased, it is possible to suppress the spread of the image, but the optical path length becomes longer, and it becomes very difficult to mount the image compactly on a camera.

As another method, there is a method in which the turning-off timing of the LED array 2a is advanced by the above-described image spread ΔL. However, in this case, in order to obtain the turn-off timing, the unit bit length L is divided into integers and the spread ΔL is obtained, as in the ENC pulse shown in FIG.
E per unit feed length such that can be expressed as an integer ratio
An NC pulse must be generated. If this ENC pulse is used, the recording pattern can be obtained as if the unit bit length L was correctly maintained at each bit position regardless of the feeding speed of the film 3.
To obtain a C pulse, a precise encoder plate and a high-resolution photointerrupter are required, which is very disadvantageous in terms of cost and installation space.

The present invention has been made to solve such a problem of the prior art. In particular, when recording binary data by turning on a light emitting element, a recording method for preventing the unit bit length from becoming long. And binary data capable of recording an accurate binary code while maintaining a constant unit bit length without imposing a large cost burden on an encoder that generates an encode signal in conjunction with film feeding. It is an object to provide a recording device.

[0009]

In order to achieve the above object, the present invention measures a film feeding speed and sets a film feeding time per unit bit length according to the feeding speed .
Rutotomoni, when recording the binary data by lighting the light emitting element, after lighting the light-emitting element, the unit bit length
In the film feeding direction rather than the film feeding time
Film feeding time corresponding to the recording width of the light emitting element
The light-emitting element is turned off at a short timing .

In order to realize the above recording method, the apparatus according to the present invention comprises an encoder for outputting an encode pulse each time a film is fed by a unit length, and an encoder for monitoring the encode pulse output from the encoder to obtain a per-bit length. Bit length setting means for setting the film feeding time of
After lighting the light emitting element, than the film feed time per the unit bit length has elapsed, the film feed Okukata
Feeding the film corresponding to the recording width of the light emitting element in the orientation
A light-off control means for turning off the light-emitting element at a timing shortened by a short time and terminating recording at the bit position is used. Further, it is determined whether or not to perform data recording by turning on the light emitting element at the next bit position.When the light emitting element is turned on also at the next bit position, it is prohibited to turn off the light emitting element by the light-off control means, In addition to monitoring the film feed speed based on the pulse interval of the encode pulse by the length setting means, and setting the film feed time per unit bit length in accordance with the film feed speed, the present invention can be implemented. Is extremely effective.

[0011]

FIG. 2 schematically shows the basic structure of a camera using the present invention. A film winding motor 13 is built in a take-up spool 12, and this motor 13
Is driven by the motor driver 16 according to a command from the microcomputer 4. At the time of normal one-frame film winding during photographing, the drive transmission mechanism 17 is switched for winding by a signal from the microcomputer 4, and the motor 13 is driven by input of an exposure completion signal. The driving force of the motor 13 is transmitted to the take-up spool 12 via the drive transmission mechanism 17, and the film 3 is taken up by the take-up spool 12.

For controlling one-frame fixed-length feed of the film 3, a reflection-type photo sensor 21 for detecting the passage of the film 3 through the perforations 3a is used. When film winding is started, the photo sensor 21 monitors the reflected light while irradiating the film 3 with infrared light. When the perforations 3 a are detected by the photo sensor 21, a PF pulse is input from the perforation signal generator 22 to the microcomputer 4. The microcomputer 4 sends a stop signal to the motor driver 16 in response to the PF pulse,
3 is momentarily stopped. In the illustrated embodiment, the film 3 is provided with one perforation 3a per frame, so that the film winding may be stopped when the photo sensor 21 detects the perforation 3a.

In the case where eight perforations are arranged per frame as in the case of 135 film, the number of PF pulses similarly detected by the photo sensor 21 is counted. The film winding may be stopped when the number of pieces has been reduced. Further, three to four perforations 3b are provided side by side at the leading end of the film 8, and this is for locking the leading end of the film 3 to the pawl of the take-up spool 12. Further, it is also possible to monitor the passage of these perforations 3b by the photo sensor 21 during the film loading, and to confirm whether the film loading is appropriate or not according to whether or not an intermittent PF pulse is obtained within a predetermined time. .

A driven roller 24 is further in contact with the film 3, and rotates when the film 3 is wound up by feeding the film 3 without slipping. An encoding plate 25 is connected to the driven roller 24 and rotates integrally with the driven roller 24. The encoding plate 25 is formed by radially forming slits in a circular plate at a constant pitch, and its rotation is monitored by a photo interrupter 26. An encode signal generator 27 is connected to the photo interrupter 26, and inputs an ENC pulse to the microcomputer 4 every time the photo interrupter 26 detects a slit of the encode plate 25. As described above, since the driven roller 24 rotates following the film 8, the ENC pulse is output from the film 3.
Is generated each time a fixed feed length is reached, and the fixed feed length is set to the unit bit length at the time of data recording.

A recording head 30 similar to that shown in FIG. 15 is provided outside the frame of the exposure aperture 29 of the camera. The recording head 30 is provided with an LED array 30a in which several LEDs are vertically arranged, and a mask plate for converting light from the LED array 30a into thin slit light is disposed on the front surface thereof. The recording head 30 is driven by a writing circuit 31 when the film is fed, and optically records, as a binary code, exposure control data such as a shutter speed and an aperture value used at the time of shooting outside the effective screen of the film 3. For this reason, the microcomputer 4 stores data RO in which the exposure control data is stored as binary code data.
M32 is connected.

The program ROM 33 stores the above-described various sequences, a sequence program for performing data recording control described later, and the like. And R
The AM 34 is used as a work area for temporarily storing data and flags necessary for performing the shooting sequence and the data recording sequence. The frame number counter 35 counts the number of frames that have been shot on the film 3.

At the terminal end of the film 3, three to four perforations are arranged at short intervals, similarly to the front end. When the last frame is photographed and film winding is started, if the perforation is detected intermittently by the photosensor 21 before the ENC pulse is counted and the feed length of one frame of the film is reached. The drive transmission mechanism 17 is switched for rewinding in response to a command from the microcomputer 4. As a result, the drive shaft 37 is rotated in the rewind direction by the motor 13, and the photographed film 3 is wound into the cartridge 38. The completion of rewinding can be detected based on a signal from the photo sensor 21.

FIG. 1 schematically shows the write circuit 31 described above. The writing circuit 31 includes the microcomputer 4
And preset data (P.DATA), address data (AD.DATA), recording data (W.DATA), and a strobe signal (STB). signal),
A clear signal (CLR signal) and a drive signal (ENC. LED) for driving the photo interrupter 26 are supplied. In addition, an ENC pulse obtained from the photo interrupter 26 is also input to the writing circuit 31.
Then, the write pulse (W
When the (R signal) is output, the LED array 30a is turned on.

The write circuit 31 has a register unit 40 having a memory capacity of 440 bits, and write data “W.DATA” and E which are supplied from the register unit 40.
A write pulse generation circuit 41 for generating a “WR signal” from the NC pulse, and EN signal from the photo interrupter 26
After the number of C pulses reaches a certain number, EN is
And a pre-counter circuit 42 for supplying a C pulse.

As shown schematically in FIG. 3, the register section 40 is connected in series with 55 parallel-in-serial-out 8-bit shift registers SH0 to SH54, and the 8-bit write data transferred from the data bus. To
A signal from the address decoder 45 is used to write to any of the cyst registers SH0 to SH54. Therefore, the address decoder 45 corresponds to 6-bit address data input from the address bus, and
An H signal is output to any one of the output terminals S0 to S54. Then, the 8-bit write data transferred by the data bus is written to any of the shift registers at the timing when the STB signal is generated. Also, E
By supplying the NC pulse to each of the cyst registers SH0 to SH54 all at once, the write data is sequentially transferred one bit at a time in the shift registers SH0 to SH54. FIG. 4 shows the shift registers SH0 to SH54.
And data terminals D0 to D7 parallel to each other are provided for each of the eight flip-flop circuits, and the data terminals D0 to D7 set one bit of write data in each flip-flop circuit. You. Note that the ENC pulse is used as a data transfer pulse for the register section 40.

FIG. 5 shows shift registers SH0 to SH54.
2 shows the state in which write data is sequentially set. Address data "AD0", "AD1",
"AD2",... "AD54" are input, and an H signal is output to one of the output terminals S0 to S54 of the address decoder 45 each time. At the same time, write data “W.DATA” of 8 bits each is transmitted from the data bus.
0 "," W.DATA1 "," W.DATA2 ", ...
.., "W.DATA54" is input, but only the predetermined shift register specified by the output terminals S0 to S54 is supplied with the write data W.DATA supplied at the time of input of the STB signal. DATA is written. Therefore, STB
When 55 signals are supplied, the write data “W.DATA0” is stored in the shift register SH0, and the write data “W.DATA1” is stored in the shift register SH1.
The write data "W.DATA54" is written into the shift register SH54, and 440 as a whole.
The binary data for the bits is set in the register unit 40.

As shown in FIG. 6, the pre-counter circuit 42 used in the write circuit of FIG.
It is composed of a combination of JK flip-flop circuits. This pre-counter circuit 42 has a “CLEA
After setting the “R” terminal to the L level, “31” is connected to the “IN” terminal.
Until the number of ENC pulses is supplied, the “OUT” terminal is kept at the L level, and subsequently input ENC pulses are directly output to the “OUT” terminal. Note that when an H signal is input from the “CLEAR” terminal, all flip-flop circuits are cleared to “0”, and the output terminal of the NAND circuit 47 becomes L level. And "CLEA
When the "R" terminal is at the H level, one input terminal of the AND circuit 48 is maintained at the L level, so that the H level ENC is connected to the input terminal "IN" of the pre-counter circuit 42.
Even if the pulse is supplied, the output of the AND circuit 48 remains at the L level.

When the count value of the pre-counter circuit 42 is "0", the JK input of the first-stage JK flip-flop circuit is at the H level. Therefore, when the supply of the ENC pulse to the "IN" terminal of the pre-counter circuit 42 is started after the "CLEAR" terminal is set to the L level, "1" is set to the first-stage flip-flop circuit. Subsequently, the ENC pulse is supplied, and when the number reaches 31, the flip-flop circuit of the last stage is set to “1”. As a result, the output terminal of the NAND circuit 47 becomes L level, and the gate of the AND circuit 48 is opened. Thereafter, the ENC pulse supplied to the “IN” terminal is output from the “OUT” terminal as it is. At this time, J of the first stage flip-flop circuit
Since the K terminal is at the L level, all flip-flop circuits perform “CLEA” regardless of the input of the ENC pulse.
The set state of “1” is maintained until the H signal is again input to the “R” terminal.

FIG. 7 shows an example of the write pulse generating circuit 41. The write pulse generation circuit 41 reads the write data “W.DATA” sent from the register unit 1 bit by one each time the ENC pulse is supplied as binary data, and reads the binary data as “1”. And outputs a "WR signal" having a predetermined time width. The pulse width of the "WR signal" is determined by the one-shot timer 50,
Therefore, the one-shot timer 50 receives the clock pulse from the clock pulse generator 51 and the preset data (P.DATA) from the microcomputer 4. The “WR signal” generated in this manner makes the switching transistor 52 (see FIG. 1) connected in series to the LED array 30a conductive, and turns on the LED array 30a.

When the signal from the D terminal changes from "H to L" in synchronization with the rising edge of the ENC pulse, the delay circuit 53 slightly changes the timing of the change from the change of the ENC pulse. It is used to prevent a hazard from occurring in the circuit 54. The AND circuit 55 is for forcibly setting the WR signal to L when the binary data from the D terminal becomes "0". In particular, the feed speed of the photographic film suddenly decreases due to a sudden factor. It has a function of preventing the turn-off timing of the LED array 30a from greatly entering the next bit position when the speed is increased.

The one-shot timer 50 is configured as a down counter by, for example, a four-stage JK flip-flop circuit as shown in FIG. When the “CLEAR” terminal goes high, all flip-flop circuits are reset to “0”, the output of the NAND circuit 57 goes low, and the JK input of the first-stage flip-flop circuit is also low.
Become a level. Therefore, in this state, the value of the down counter does not change even if a clock pulse is input from the clock pulse generator 51.

When a pulse is supplied to the "PRESET" terminal while the "CLEAR" terminal is at the L level, the 4-bit "P.DATA" supplied from the "PRESET DATA" terminal at the rising edge causes each flip-flop to flip. Each bit is set in the flip-flop circuit. When "1" is set to any one of the flip-flop circuits, the output of the NAND circuit 57 goes high, and the JK input of the first-stage flip-flop circuit also goes high. Thereafter, every time a clock pulse is supplied, down-counting is performed. When the count value becomes "0", the output of the NAND circuit 57 goes low again and the counting stops. Therefore, the period during which the output of the NAND circuit 57 is at the H level is a period from the rising of the pulse of the PRESET terminal to the end of the down-counting.
The H level output of the NAND circuit 57 can be used as a WR signal, and its time width is the product of the period of the clock pulse and the value of “P.DATA”.

The data recording function of the camera configured as described above will be described below. FIG. 9 shows a flow of a basic data recording process. When the exposure completion signal is input to the microcomputer 4, the microcomputer 4 refers to the data ROM 32 and stores the exposure control data and the trimming data used for the photographing in 440-bit data.
To hex code. This 440-bit binary code becomes write data “W.DATA”, and the write data “W.DATA” is sequentially output to the data bus in units of 8 bits. At the same time, 6-bit address data “AD.DATA” is output to the address bus, and 440-bit write data “W.DATA” is set in the register unit 40.

Further, the microcomputer 4 has an ENC
The pulse count value N is initially set to “0”, a signal “ENC.LED” for driving the photointerrupter 26 is output, and the CLEAR terminal is set at L level to set the motor 13
Start. The film feed is started by the activation of the motor 13, and the encode signal generator 27 outputs an ENC pulse and supplies it to the pre-counter circuit 42 every time the film 3 is sent by the unit bit length L. However, the film feeding speed immediately after the start of film feeding is unstable, and it is not preferable to write data during this period. In addition, in order to start recording a binary code from a fixed position immediately below the shooting frame. After the start of feeding, the number of ENC pulses is "3
2 ”, even if an ENC pulse is supplied to the pre-counter circuit 42, the pre-counter circuit 42
No ENC pulse is input to the 0 and write pulse generation circuit 41, and no data write is performed.

When the number of ENC pulses reaches 32,
From the pulse interval between the currently detected ENC pulse and the previously detected ENC pulse, the time required for unit bit length feeding (corresponding to the number of clock pulses) is obtained, and the film feeding speed v is calculated from this. I do. The value of the film feed speed v is not always constant due to factors such as the diameter of the film 3 wound on the take-up spool 12 or the consumption of the power supply battery. Almost coincides with the film feeding speed. Then, the microcomputer 4 sets the preset data “P.DATA” based on the film feeding speed v.
And the value is set in the one-shot timer 50 in the write pulse generation circuit 41.

The value of "P.DATA" is obtained by the following equation using the unit bit length L and the spread ΔL in FIG. 16, where f is the period of the clock pulse supplied from the clock pulse generator 51. . “P.DATA” = f · (L−ΔL) / v This value decreases as the film feeding speed increases.

In the one-shot timer 50, "P.DAT
After setting "A", the count value N of the ENC pulse is reset to "0". Then, the write pulse generation circuit 41 outputs the ENC pulse transmitted thereafter and E
The “WR signal” is generated from both the “W.DATA” transmitted from the register unit 40 bit by bit by the NC pulse. FIG. 10 shows a state in which binary codes are written in the order of “101100” in a state where the feeding speed of the film 3 is constant. Since the output of the AND circuit 54 shown in FIG. 7 is a logical product of the ENC pulse and “W.DATA” transferred from the register unit 40 at that time, one bit forming “W.DATA” Only when the binary data is "1", the gate is opened and an ENC pulse is output. When this ENC pulse is input to the one-shot timer 50, the Q terminal of the one-shot timer 50 goes high. Thereafter, one-shot timer 50 counts the clock pulses from clock pulse generator 51, and the counted value is “P.DAT”.
When it reaches "A", the Q terminal is set to the L level.

The pulse width WT of the H signal obtained from the Q terminal of the one-shot timer 50 is represented by the product of the clock pulse period and the value of "P.DATA".
And is output as a “WR signal”. The "WR signal" causes the transistor 52 shown in FIG.
The LED array 30a is turned on to perform writing. This writing time is equal to the pulse width WT of the “WR signal”, and is shorter by ΔT0 than the time T0 required to feed the film 3 by the unit bit length L. However, the time ΔT0 coincides with the time required to feed the film 3 by the spread ΔL of the luminous flux when the LED array 30a is imaged on the film 3, and as a result, FIG. As described above, binary data of “1” with a unit bit length L can be recorded on the film 3.

As described above, when "1" is written as binary data, "WR" obtained from the AND circuit 55 is used.
Signal WT (= T0−
By lighting only ΔT0), only the range of the unit bit length L can be exposed on the film, so that exposure is not performed over the next bit position.
When the binary data to be written is “0”, the output terminal of the AND circuit 54 remains at L level.
The film 3 is fed by the unit bit length L while the LED array 30a is turned off. In addition, while repeating the data writing one bit at a time, the value of “P.DATA” is updated each time according to the value of the film feeding speed v at the time of the previous data writing.

When the writing of the data of 440 bits set in the register section 40 is completed, the microcomputer 4 sets the "CLEAR" terminal to the H level and resets the internal storage of the write pulse generating circuit 41 and the pre-counter circuit 42 to the initial state. Return to In a state where the “CLEAR” terminal is at the H level, no data write operation is performed even if an ENC pulse is generated, thereby prohibiting writing. Subsequently, the photo sensor 21 and the perforation signal generator 22 monitor whether or not the film 3 has been fed by one frame. When the PF pulse is generated and input to the microcomputer 4, the microcomputer 4 inputs a stop signal to the motor driver 16, whereby the motor 13 is stopped and the film feeding is completed.

If the film feeding speed increases due to a sudden cause after the data writing is started, for example, as shown in FIG. 11, the film feeding speed is generated every time the unit bit length is fed. The pulse period of the ENC pulse is shortened from the normal pulse period T0 to T1. In such a case, if the pulse of the width WT output from the one-shot timer 50 is simply used as the “WR signal”,
In particular, when the binary data of the next bit is “0”, the write pattern largely protrudes to the next bit position. However, the AND circuit 55 turns off the gate at the moment when the write data changes from “1” to “0”,
The lighting time of the ED array 30a is referred to as "WT- (T0-T
1), the amount of protrusion does not exceed ΔL. In addition, since the frequency of occurrence of such a situation is extremely low, the unit bit length is kept constant in most cases as compared with the conventional case where data is written based solely on the generation of an ENC pulse. be able to.

Conversely, if the film feeding speed becomes slow for some reason after the start of data writing,
As shown in FIG. 12, the pulse cycle of the ENC pulse generated each time the unit bit length is fed is extended from the normal pulse cycle T0 to T2. In such a case, if data is written as it is with the WR signal obtained by the above-described write pulse generation circuit 41, the turn-off timing of the LED array 30a is accelerated with respect to the feed length of the film. The unit bit length becomes shorter. When the binary data "1" is written at the next bit position, a blank portion is generated at the boundary, which again causes a reading error.

In order to cope with such a problem, the write pulse generating circuit 60 shown in FIG. 13 may be used instead of the write pulse generating circuit 41. The write pulse generating circuit 60 uses the one-shot timer 50 and the clock pulse generator 51 in common, but additionally includes a flip-flop circuit (FF) 61,
62, and AND circuits 64, 65, 66, and an OR circuit 67. The FFs 61 and 62 store the write data W. The two bits of DATA are temporarily stored. The inverted output of the FF 61 and the non-inverted output of the FF 62 are input to the AND circuit 64, and the binary data to be written at this time is “1”.
Only when the value data is “0”, the output of the AND circuit 64 goes to H level. At this time, the AND circuit 64,
66 operates in the same manner as the AND circuits 54 and 55 in the write data generation circuit 41, and the write pulse generation circuit 60 performs the same operation as the write pulse generation circuit 41 irrespective of the OR circuit 67.

For the AND circuit 65, FFs 61 and 62
Is input. The output of the AND circuit 65 indicates that the binary data to be written at this time is “1”.
Therefore, only when the next binary data is “1”, the level becomes H level. The output of the AND circuit 65 is input to the OR circuit 67. Therefore, when the binary data at the next bit position is also "1", the Q terminal output (pulse width WT) of the one-shot timer 50 changes from H level to L level. Even if the level changes, the "WR signal" of the H level can be continuously obtained. If data writing is performed using the "WR signal" obtained in this manner, the film feeding speed suddenly increases, and even in a portion where the binary data continues as "1" and "1", the writing pattern is formed at the boundary portion. There is no blank space.

Although the above embodiment is directed to a camera in which one ENC pulse is obtained each time the film 3 is fed by the unit bit length L, the present invention is not limited to such a camera. For example, using a unit length feed pulse obtained when a film is fed by a unit length sufficiently shorter than the feed length of one frame of film, and writing data for a plurality of bits within the pulse interval The present invention can be applied to a camera configured to perform the above. For this purpose, as shown in FIG. 14, every time a new unit length feed pulse pulse is detected, the pulse interval between the previously detected unit length feed pulse and the previously detected unit length feed pulse is multiplied by “0.9”, Predicted pulse interval Pre. Find D. The meaning multiplied by “0.9” means that when the rotation speed of the motor 3 shifts to a complete constant speed rotation region, the rotation speed may increase,
Also, the film feeding speed tends to be increased due to the thickening of the film. If these effects are so small that they can be ignored, the value of the previous pulse interval D is used as it is as the predicted pulse interval Pre. D may be used.

The predicted pulse interval Pre. After obtaining D, the number of bits N to be recorded during the pulse interval of the unit length feed pulse N
_The division by ₀ (“N ₀ = 5” in this embodiment) is performed to determine the unit bit recording time ΔD. Of course, when recording “10” bits in one cycle of the ENC pulse,
Predicted pulse interval Pre. The unit bit recording time ΔD may be obtained by dividing D by “10”. Various means such as rounding down, rounding up, and rounding can be used for the remainder resulting from this division. Since the clock pulse is usually a high frequency of about several MHz, the predicted pulse interval Pr
e. Since the number of clock pulses corresponding to the period D is also much larger than the number of bits of data to be recorded, the remainder can be ignored.

In this way, every time the unit length feeding pulse is detected, the unit bit recording time ΔD is obtained, and the pseudo ENC pulse shown in the figure can be obtained. If the pseudo ENC pulse is used as the ENC pulse in the above-described embodiment, even if the encoder plate 25 or the photo interrupter 26 has a simpler configuration, the encoder bit 25 and the photo interrupter 26 can be almost satisfied while correctly maintaining the unit bit length L. Data writing can be performed.

Although the present invention has been described with reference to some embodiments, the number of ENC pulses generated during the feeding period of one frame of a film, or the amount of data recorded within one pulse interval of an ENC pulse. The number of bits and the like can be appropriately set as needed.
The means for generating an ENC pulse is not limited to a combination of an encoding plate and a photo interrupter, or a combination of a film perforation and a photo interrupter. For example, a magnetic recording band in which a magnetized region and a non-magnetized region are arranged at a constant pitch on the edge of the film May be read by a magnetic head to generate an ENC pulse.

[0044]

As described above, according to the method of the present invention,
At the bit position where binary data recording is performed by turning on the light emitting element, a unit bit determined based on the film feeding speed is used.
Before the film feeding time per door has elapsed, the light-emitting element
Since the light emitting element is turned off in consideration of the spread of the spot light due to the above, it is possible to prevent the unit bit length at that bit position from becoming long. According to the data recording apparatus of the present invention, the encoding pulse obtained every time the film is sent in the unit length is monitored and the encoding pulse per unit bit length is monitored.
The film feeding time is set, the light emitting element is turned on during data recording, and then the film feeding per unit bit length is performed.
Before the transmission time elapses , the spread of the spot light of the light emitting element
In consideration of the above, the light emitting element is turned off, so that the unit recording bit length can be kept constant without being affected by the spread of the luminous flux from the light emitting element without detecting the encoding pulse with high accuracy. it can. Further, when the light emitting element is turned on even at the next bit position, the light emitting element is continuously turned on, so that data recording can be performed without generating a blank portion at the boundary between these elements. Furthermore, by monitoring the film feeding speed and setting the film feeding time per unit bit length corresponding to the film feeding speed, the pulse interval of the encode pulse is divided and the unit bit length of data recording is set. You can also do it.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a data write circuit using the present invention.

FIG. 2 is a block diagram illustrating an electrical configuration of a camera using the present invention.

FIG. 3 is a circuit diagram schematically showing a register unit used in the circuit of FIG. 1;

FIG. 4 is a circuit diagram showing an 8-bit shift register used in the circuit of FIG. 3;

FIG. 5 is an explanatory diagram of a state in which write data is set in a register unit.

FIG. 6 is a block diagram showing a pre-counter circuit used in the circuit of FIG.

FIG. 7 is a block diagram showing a circuit configuration of a write pulse generation circuit used in the circuit of FIG.

FIG. 8 is a block diagram showing a circuit configuration of a one-shot timer used in the circuit of FIG.

FIG. 9 is a flowchart illustrating a flow of a data recording process according to the present invention.

FIG. 10 is a timing chart showing a state during normal data recording.

FIG. 11 is a timing chart showing how data is recorded when the film feeding speed is increased.

FIG. 12 is a timing chart showing a state of data recording when the film feeding speed is reduced.

FIG. 13 is a block diagram showing another example of the write pulse generation circuit.

FIG. 14 is a timing chart showing another application example of the present invention.

FIG. 15 is a schematic configuration diagram of a recording head for writing data.

FIG. 16 is a timing chart in a conventional recording method.

[Explanation of symbols]

 Reference Signs List 3 Film 4 Microcomputer 6 Imprint lens 10 Encoder 11 Photosensor 20 Recording head 24 Follower roller 25 Encoding plate 26 Photointerrupter 40 Register unit 41, 60 Write pulse generation circuit 42 Precounter circuit

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03B 17/24 G03B 17/00

Claims (4)

(57) [Claims] 1. A binary data recording method for optically recording binary data on a film being fed by blinking a light emitting element, wherein a feeding speed of the film is measured and a unit bit length corresponding to the feeding speed is measured. In determining the lighting time of the light emitting element of
From the time required for the film to be fed in unit bit length
Equivalent to the recording width of the light emitting element in the film feeding direction
Lighting element lighting time is the time obtained by subtracting the film feeding time
A binary data recording method, characterized in that: 2. A binary data recording apparatus for blinking a light emitting element during film feeding and optically recording binary data consisting of a plurality of bits on the film, wherein an encode pulse is generated each time the film is fed by a unit length. Monitors the encoder and the encode pulse output from this encoder, and checks the file per unit bit length.
Bit length setting means for setting a film feeding time; and, after lighting the light emitting element, a film per unit bit length.
Recording of light emitting elements in film feeding direction from feeding time
Subtract the time required for the film to be fed by the width
And a light-off control means for turning off the light-emitting element when the elapsed time has elapsed and terminating recording at the bit position. And determining whether or not to perform data recording by turning on the light emitting element at the next bit position. When the light emitting element is turned on also at the next bit position, control of turning off the light emitting element by the light off control means is prohibited. 3. The binary data recording device according to claim 2, wherein: 4. The bit length setting means monitors a film feeding speed based on a pulse interval of an encode pulse, and sets a film feeding time per unit bit length in accordance with the film feeding speed. 4. The binary data recording device according to claim 2, wherein: