JPS63147150A - Camera with data imprinting mechanism - Google Patents

Abstract

PURPOSE:To suppress variance in total film use length to a constant value by allowing an encoder which indicates timing to output (n) pulses while a film travels by one frame. CONSTITUTION:As the film after exposure is wound, a slit plate 10 rotates to cut off and transmit light projected from an LED 52 upon a photodetecting element 54, and then pulses 'H' and 'L' are outputted alternately from an output terminal 56. Even if an initial position shifts, a counter is reset at timing earlier than the time required by the slit plate 10 to rotate from a nontransmission part 10-d to a nontransmission part 10-a and then the nontransmission part 10-a is counted by the counter as a 1st pulse, so there is no integral quantity generated even in case of the initial position shift. Consequently, the quantity of the overrunning of the film after the end of the film winding is prevented from being integrated.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a camera with a data imprinting mechanism that imprints data characters on the film surface by driving, for example, a plurality of light emitting elements in synchronization with the film running. In particular, the present invention relates to a camera with a data imprinting mechanism that uses an encoder to obtain a synchronizing signal for film running.

[Background of the invention]

Conventionally, various proposals have been made regarding this type of camera with a data imprinting mechanism, but among them, for example, a camera with multiple LEDs
There is a device in which a plurality of light emitting elements such as the like are arranged in a vertical line in a direction perpendicular to the film running direction, and the plurality of light emitting elements are turned on during film winding to imprint data onto the film surface.

Some of these cameras use an encoder that generates a film run synchronization signal to determine the timing of data imprinting while the film is running, and this encoder is also used to index the film screen. There is. That is, an encoder that generates a pulse according to a certain amount of film while moving one frame of film is built into the camera, and the encoder detects the winding of one frame of film and determines the timing of data and imprinting while the film is being wound. This is how it was done. Figure 6 shows a conventional example of this type of encoder.
The slit pattern disk 1 is a combination of a slit pattern disk 1 in which transparent areas 1a and non-transparent areas 1b are provided at equal pitches (centered patterns are provided at equal pitches), and a photointerlab 2. It is designed to rotate around an axis 3 as it moves, and a mother pulse is generated from the photointerrupter 2 at every fixed rotation angle of the slit pattern disk 1. 4
The turn disk 1 is configured to rotate exactly once.

By counting the pulses from the photointeracitor 2, the timing of data imprinting and the stop of film running are instructed.

By the way, in a camera using such an encoder, when 74' pulses corresponding to one rotation of the slit pattern disk 1 are counted, the film is instructed to stop running, but the winding of one frame of film is not completed. Even if the power to the film winding motor is later stopped, the film cannot be stopped immediately due to the inertia of the film winding drive system, so the film will move a certain distance from the predetermined position depending on the film travel speed. The amount of overtravel will vary depending on the film speed, but if this amount of overtravel is accumulated each time the film is wound, the total travel after shooting one film will be If the amount of overshoot, that is, the accumulated error, is large enough, there is a risk that it will not be possible to take a predetermined number of images with the film.

For example, while moving one frame of film, the slit pattern disk 1
With one rotation of /? Assuming that 360 pulses are generated, 3
Assuming that the film travel actually stops after the motor stop signal is issued every time 60 pulses are detected and the film progresses by 9 cis and 10 pulses (after all)
The film stops after 370 pulses are generated, and the film advances an extra 10 pulses.

This is repeated for each film ticket (for example, 3
After shooting 6 frames, 10 pulses x 36 frames = 3
A cumulative tag of 60 pulses is generated, which corresponds to one frame of film, and one frame of film is wasted.

In order to solve these difficulties, an encoder as shown in FIG. 7 has been proposed.

This encoder has a transparent part 4 in a slit pattern disk 4.
A and the first non-transmissive part 4b are provided alternately in an equal pinch, and a second non-transparent part 4c is provided outward in the radial direction from one of the first non-transparent parts 4b, and a transparent part 4a and the first non-transparent part 4b are detected by the first 7-bit interrupter 5, and the second non-transparent part 4C is detected by the second 7-bit interrupter 6.
I am trying to detect it with . Then, the first photointerrupter 5 generates a pulse to determine the data imprinting timing, and the second photointerrupter 6 generates a pulse to determine the film winding completion position. It has become. If this is done, the film winding stop signal will always be issued at the same position during one revolution of the encoder every time the film is wound, so there will be no cumulative error in the amount of overshoot after the film has stopped. This method has disadvantages in that it requires two sets of getters, which is disadvantageous both in terms of cost and in terms of the limited space within the camera. [Object of the Invention] The present invention solves these conventional problems. This was done in order to solve the problem.The timing of data imprinting and the timing of stopping the film running can be instructed by the 9 pulses from one output system of the encoder, and it also reduces the cumulative amount of film overshoot after the film winding is completed. The object of the present invention is to provide a camera with a data imprinting mechanism that does not cause data imprinting.

[Summary of the invention]

The data imprinting machine and structured camera according to the present invention include an encoder that outputs n gills from the middle of one frame of film to the end of the film in synchronization with the running of the film; a means for imprinting data;
A film running control means for driving and controlling the running of the film, and a film running control means that counts pulses from the encoder and converts the pulses into meters.
(m<nlf[ffl) The control means drives the data imprinting means while counting, and instructs the film running control means to stop the film running when n pulses are counted; This is characterized in that counting is started by using a pulse output from the middle of the run as a valid/2 pulse.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows an embodiment of an encoder that can effectively implement the present invention. In the figure, 10 is a slit plate, which is connected to a film winding drive system (not shown) and has a shaft 3.
It is possible to rotate around the center. Reference numeral 11 denotes a photointerrupter, and a non-transparent part 108 is formed in a part of the slit plate 10.
A pulse is generated every time ~10d is detected. The slit plate 10 rotates in the direction of the arrow as the film is wound up, and is linked to the movement of the film so that it rotates exactly once when one frame of film is wound up. The slit plate 10 is made of a light-transmitting material and has a disc shape, and has a large number of non-transparent parts (10a) formed in a band shape with a constant angle range β around the entire circumference.

10b...10c, 10d) are provided at equal intervals radially, and when the data imprinting control circuit trap (to be described later) counts a predetermined number of non-transparent parts, the film 1
It is designed to issue a stop signal for winding the pieces. Further, a timing signal for data imprinting is output by counting the number of non-transparent parts in the range of α.

The photointerrupter 11, as shown in FIG.
D 52 and a light receiving element 54, the LED 52
When the light from the light receiving element 54 is blocked, current no longer flows through the light receiving element 54, and the output of the output terminal 56 is at a low level (hereinafter abbreviated as "L").

Further, when the light from the LED is projected onto the light receiving element 54, current flows through the light receiving element 54, and the output of the output terminal 56 becomes a high level (hereinafter abbreviated as "H").

That is, after each frame of film has been photographed, the winding control circuit 51 that controls the drive of a film winding motor (not shown) drives the winding motor to wind up the photographed film. , the slit plate 10 rotates to block or transmit light from the LED 52 to the light receiving element 54, so that @Hjl, "L" is output from the output terminal 56.
pulses are output alternately. In addition, when the hoisting control circuit 51 receives a hoisting start signal, it turns on the switching transistor 53 and lights up the LED 52.

Next, one embodiment of the camera according to the present invention will be described based on the circuit diagram shown in FIG.

The pulses output from the encoder A are input to the D flip-flop (abbreviated as D-FF) 102 and the AND/DART 103, and the D-FF 102 and the AND/DART 103 cause the pulse from the encoder A to become “L”.
” to 1H#, a one-seventh pulse is output from the AND gate 103 to the timer 105. Timer 1
05 is reset by the aforementioned one-seventh pulse. The clock input to the timer 105 is ANDr-)
117 and from the hoisting control circuit 51
The clock pulse of the clock pulse generator (hereinafter abbreviated as O8C) 104 is output only when the #H# signal is received. Note that the winding control circuit 51 outputs a signal of level "H#" to the AND dirt 117 during film winding, and
When a signal of level @H1 is input from the feeder 108, the winding of the film is stopped.

Now, at the initial winding start position, the relationship between the 7-way interrazota 11 of the encoder A and the slit plate 10 is as shown in FIG.
It is assumed that the slit plate 10 has stopped immediately after detecting d.

From this state, the slit plate 1 is
0 rotates counterclockwise, since there is no non-transparent part at the initial rotational position of the slit plate 10, the light from the LED 52 of the photo interrogator 11 passes through the slit plate 10 and reaches the light receiving element 54, and / 4' pulse signal is not output, D-FF102. The one shot by AND gate 103 is not output, and the output of AND gate 103 is @
It is "L".

When the film winding starts, and dirt 117
Since the hoisting control circuit 51 outputs an "H" signal, the clock pulse from the 08C104 is input to the timer 105, and the timer 105 counts the clock pulse. When the timer 105 counts the number of clock pulses (N1) corresponding to a certain period of time before the first non-transparent part lQa of the slit plate 10 reaches the detection position of the photointerlacitor 11, the timer 105 starts the level from the terminal Qs. @H
A signal of `` is output to the inverter 106, and the output of the inverter 106 becomes ``L''.

Here, when the slit plate 10 rotates, it is estimated that the maximum time required to detect adjacent non-transparent part patterns is required for the slit plate 10 to rotate by an angle of t1 + (360-β). Assuming that the minimum time is ts, the number of clock pulses corresponding to an arbitrary time t2 that satisfies the relationship tl (tx <ts) is set as N1.

On the other hand, the output from encoder A is also output to the counter 108, but since there is no pulse output from encoder A at the initial stage of film winding, a signal of level ``L'' is sent from terminal Q1 of the counter 108 to the inverter. 107
The output of the inverter 107 becomes 1H''.

The signals from the inverter 106 and the inverter 107 are input to an R-S flip-flop circuit consisting of NANDOGOO 109 and 110, and when the output of the inverter 106 becomes @L", the output of the latch becomes 1H".

The latch output @H'' is outputted to one terminal of the AND date 111 before the first non-transparent part tOa of the slit plate 10 of the encoder A reaches the detection position of the photointerlager 11.

Winding of the film continues, and the slit plate 10 reaches (36
0-β), the first non-transparent part 10m of the slit plate 10 reaches the detection position of the photointerrupter 11, and when the signal from the encoder A changes from the level SH* to the level 1L'', the and dart 103 outputs a one-seventh pulse to the timer 105 to reset the timer 105, and the counter 108 starts the pulse F of the encoder A, and further outputs the same pulse as the mother pulse from the encoder A from the AND gate 111. D-FF11
Output to 2. When the pulse from the AND gate 111 that changes from "L" to "H" is input to the clock input terminal of the D-FF 112, the Q output becomes @L#.Then, the reset of the timer 113 is released and the AND/DART 11
When the number of clock pulses (N,) corresponding to the time required for imprinting is counted, a signal of level "H#" is output from the terminal Q9 to reset the D-FF 112.

When the D-FF 112 is reset, the Q output becomes "H" and the timer 113 is reset.

While the Q output of the D-FF 112 is at the level w"L", that is, the slit plate 10 of the encoder A is at (36
0-β), then rotate the angle α to obtain the non-transparent J
? Each time a turn is passed, the decoder counter 114 for lighting the data imprinting LED is selected, and data according to the contents of the decoder counter 114 is sent to the LED driver 115, and the LED array 116 is output accordingly.
The LED lights up and data is imprinted onto the moving film surface. The LED array 116 includes a large number of LEDs arranged in a vertical line along a direction perpendicular to the film running direction, and is provided, for example, on the back cover of a camera.

The decoder counter 114 also includes an inverter 118
The output from the decoder counter 114 is inputted, and the data from the decoder counter 114 is outputted to the LED driver 115 in synchronization with the pulse from the encoder A.

On the other hand, the cuff 108 counts the pulses output from the encoder A even during data imprinting, and counts all the non-transparent parts 1 provided within the range of angle β of the slit plate 10.
When the counter 108 counts the number of pulses equal to 0m, 10b...10c, 10d, the Q7 output of the counter 108 becomes "H", and the hoisting control circuit 51 starts the hoisting motor. Stop.Now slit plate 1
This means that 0 has rotated once. Normally, at this point, the winding motor is suddenly stopped by applying the brake or by reversely energizing the motor for a short period of time, thereby completing the winding of one frame of film.

Next, the initial position of the winding start position is set to 10, for example, after the winding motor stops, the film is pulled in the opposite direction due to the reaction, and the slit plate 10 rotates in the opposite direction. The case where the value shifts from -d to 10-0 will be explained.

When winding is started and the slit plate 10 begins to rotate in the direction of the arrow, the counter 108 counts 4 ruses (generated at the non-transparent part 10-d),
The pulses counted by the counter 108 are reset again by setting the Q12 output of the timer 105 to be "H" by the time a reaches the detection position of the photointerrupter 11. When the first non-transparent part 10-a of the slit plate 10 reaches the detection position of the photointerrogator 11, the content of the counter 108 is 0, and the signal from the encoder A is ! If you count cis n1, Q
7 Set the output to "H".

That is, even if the initial position deviates, if the counter 108 is reset at a timing earlier than the time it takes for the slit plate 10 to rotate and reach the non-transparent part 10-d to 10-a, the non-transparent part 10- Since a is always counted by the counter 108 as the 1st or second, even if an initial position shift occurs, no cumulative amount occurs.

Therefore, since the hoisting stop signal to the hoisting motor is always issued when the last non-transparent part 10d of the slit plate 10 is detected, the slit plate 10 when the hoisting stop signal is issued
The absolute position of can be defined.

FIG. 3 is a plan view showing another embodiment of the encoder.

In the figure, reference numeral 20 denotes a magnetized plate, the outer periphery of which is alternately magnetized with S and N poles, and is detected by a kite element 21 whose resistance value changes depending on the strength of the magnetic field. Here, too, the S and N poles are magnetized only within a certain angular range β of the magnetized plate. and,
By counting a predetermined number of pulses generated in this magnetized portion by the magnetic element 21, a signal to stop winding one frame of the film is issued. Similarly, the timing signal for data imprinting is performed within the range of α.

As shown in FIG. 4, the German element 21 corresponds to a resistor 81, 83 whose resistance value changes depending on the strength of the magnetic field, and a resistor 80.
．． The rotational movement of the magnetized plate 20 is detected by changing the partial pressure ratio by the combination of 81 and resistors 82 and 83. and,
Voltage fluctuations are compared by a comparator 84, and a pulse corresponding to the amount of rotation of the magnetized plate 20 is output from a terminal 85.

〔Effect of the invention〕

As explained above, according to the present invention, the encoder that instructs the timing of data imprinting and the timing of stopping film travel outputs n pulses from the middle of one frame of film to the end of travel. Therefore, for example, an encoder is provided on a part of a disc that rotates in synchronization with the running of the film, with non-transparent parts and transparent parts radially provided alternately at every equal rotation angle of the disc. At the same time, the other part can be made into a transparent part, and the position of this non-transparent part can be detected by one photo-interrogator to generate a notarus, so the encoder mechanism can be simplified and miniaturized. can.

In addition, the encoder is designed to output n pulses from the time the film is running for one frame to the end of the run, while the control means is designed to output pulses that are input from the time the film is running halfway through. Since it is counted as a pulse, for example, even if the film returns after the film has stopped running, that pulse will not be counted in the winding of the next frame of film. The effect is that the total length of film used can be kept constant without variation.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of an encoder that can effectively implement the present invention, FIG. 2 is a circuit diagram of the photointerrupter, and FIG. 3 is a perspective view showing another embodiment of the encoder.
FIG. 4 is a circuit diagram of the head element, FIG. 5 is a circuit diagram showing an embodiment of the camera according to the present invention, and FIGS. 6 and 7 are plan views of a conventional encoder. 10 Nissuritsu board 11 Near-odd interrogator 2
0: Magnetized plate 21: MR element A; Encoder 51: Hoisting control circuit 102.11
2: D flip frog 103.111: AND date 104: Clock pulse oscillator 105.113: Timer 106.107: Inverter 108: Counter 109.110: NAND dart 114: Decoder counter 115: LED driver 116 Two LED array Figure 3 Vo .

Claims (1)

[Scope of Claims] 1. An encoder that outputs n pulses from the middle of one frame of film to the end of the film in synchronization with the running of the film, and data imprinting means that imprints data onto the film; a film running control means for driving and controlling the running of the film; and a film running control means for counting pulses from the encoder, driving the data imprinting means while counting m (m<n) pulses, and driving the data imprinting means for counting the pulses for m (m<n); Data imprinting comprising a control means for instructing the film running control means to stop the film running when counted, and the control means starts counting by using a pulse outputted during the running of the film as an effective pulse. Camera with mechanism. 2. The encoder is arranged such that on a part of a disc that rotates in synchronization with the running of the film, non-transparent parts and transparent parts are provided radially and alternately at equal rotation angles of the disc, and other parts are provided with non-transparent parts. 2. A camera with a data imprinting mechanism according to claim 1, wherein the camera is configured to detect the position of the non-transparent part and generate a pulse by detecting the position of the non-transparent part using a photointerrupter. 3. The encoder is installed on a part of the outer circumference of a disc that rotates in synchronization with the running of the film, and has an S-pole (N) at every equal rotation angle of the disc.
2. A camera with a data imprinting mechanism according to claim 1, wherein the camera is configured such that the poles are alternately magnetized and detected by an MR element to generate pulses.