JPS60166938A - Data imprinting camera - Google Patents

Abstract

PURPOSE:To imprint data at specific character intervals by detecting the feed speed of a film with a current flowing to a motor and imprinting the data at timing corresponding to the feed speed which becomes stable. CONSTITUTION:A control circuit 10 detects the current flowing to the motor 11, generates an imprinting start signal START when the current value becomes constant, and outputs the speed VC at this time to a timing generating circuit 13. The circuit 13 receives the signal START to generate and input an imprinting timing signal corresponding to the speed VC to an LED turning-on circuit 6. The circuit 6 turns on an LED5 every tiem the signal TCK rises and the terminal CLK of a shift register droup 4 goes up to a high level every time the LED turns on once to shift the data successively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data imprinting device, particularly a data imprinting device that imprints characters, numbers, symbols, etc. onto the film surface by flashing a plurality of imprinting elements in conjunction with the film feeding operation. The present invention relates to a camera equipped with a device.

Conventional cameras with data imprinting devices include those that manually set a data plate on which numbers, symbols, etc. to be imprinted are formed, and imprint them onto the film surface at the same time as shooting using light emitted from a small light source; There are known methods in which a pVc 7-segment liquid crystal display is used as a data plate and is imprinted using a transmitted light method, and a 7-segment light emitting diode is used to form numbers and the like and the information is imprinted by the light emitted from the light emitting diode. With all of these types of data imprinting devices, data is imprinted while the film is stationary, so the number of numbers, symbols, etc. that can be imprinted is limited by the size of the data board, the number of liquid crystal panels, and the number of light emitting diodes. The types were also limited to numbers and very limited symbols.

On the other hand, an apparatus has been proposed, for example, in Assembly No. 11554-1245, which flashes a point light source in conjunction with the film feeding operation and thereby imprints data symbols on the film.

For example, if you try to print a character with 5 x 7 dots in one character onto the film using a device like Jin, the film will be 0.
．． Although it is necessary to generate a pulse every 2 tm of movement, it has been difficult to detect such a movement amount. In addition, the film feeding speed of the electric winding type cameras that are used these days varies greatly depending on the type of film, the power supply status of the feeding circuit, the temperature, etc. When the film feed speed is fast, the characters shown in Fig. 8 (b) K will be displayed, and when the film feeding speed is slow, the characters shown in Fig. 8 ( C)
The drawback was that it resulted in a cluttered text trap as shown in the figure below. Also, it takes a certain amount of time for the film feeding speed to reach a constant speed from when the motor is started, and during this time the speed changes rapidly. ) The dot spacing changes as shown in ().

FIG. 9 shows changes in the film feeding speed from the time the motor is started. For example, the film feeding speed changes as shown in the figure depending on the magnitude of the motor load torque.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a data imprinting camera that can imprint a wide variety of dot matrix data at constant character intervals.

An embodiment of the present invention will be explained below with reference to the drawings.

FIG. 1 shows a camera to which the present invention is applied, with the back cover open. OA is the camera, 5 is a light emitting unit held on the back cover B, and the light emitting unit 5 is held at right angles to the running direction of the film 9. Consisting of seven LEDs arranged in a row, the light emitted from them forms an image on the film through a lens 8 placed on the front, and by blinking while the film is being fed, a data image is transferred onto the film screen. It's starting to get crowded.

Reference numeral 11 denotes a film feeding motor, which drives the winding shaft of the camera via a transmission gear train 12.

FIG. 2 is a block diagram of the data imprinting circuit.

In the figure, l is a data input means for setting data such as nine numbers and characters to be imprinted on a key switch or the like. 2 is a means for storing the data; %3 is a decoder for converting the data into a 5×7 dot pattern. Reference numeral 4 denotes a register group into which converted data is imprinted and read out in response to a timing signal TCK. Reference numeral 5 denotes the aforementioned light emitting unit, and 10 denotes a control circuit for the motor 11, which drives the motor at a constant voltage, detects the current IM flowing through the motor, and outputs an imprinting start signal 8TA when the current value becomes constant. , the speed VC at that time is output to the timing generation circuit 13. 13 is designed to generate an imprint timing signal TCK in response to VcK upon receiving the start signal 8TAR'I'. The TCK signal is input to the LHD table lamp circuit 6, and the lighting circuit 6 lights up the KLHD every time the TCK signal rises, and the lighting time can be changed by the film sensitivity input means 7. Every time the 01 lighting is completed, the CLK terminal of the shift register group 4 is set to the no-y level, and the data in the shift register group 4 is sequentially shifted.

FIG. 3 shows an embodiment of the shift register group 4, LED lighting circuit 6, and film sensitivity input means 7 in FIG. 2. 6 and 7 constitute a monostable multivibrator, and when the TCK terminal is high Then, the button turns on the transistor 601 for a certain period of time determined by the capacitor 602 and one of the resistors 701 to 703.

401 to 407 are shift registers that connect the DSBT terminals to 1.
When set to A, data is set, and data is sequentially output at each rising edge of the input to each CK terminal.

FIG. 4 shows an embodiment of the shift register shown in the above-mentioned 401 to 407K. 408 to 415 are four D7 lips whose operations are shown in Table 1. When psg'r terminal is high, Di
Each data of n-Dio is set to each 7 flip-flop. Table 1 The output Q of each free-horn 70-tub is connected to the D input of the next flip-flop, and is fixed at low level, and the last D
The Q output of the 717 flip-flop is connected to the LEDK.

When the transistor 601 is turned on, the D clip 70 tube 4
When the Q output of 08 is high, the LED lights up (it remains off when it is low).

Next, when the transistor 601 is turned off, the data whose CLK terminal is high is shifted one by one. Thereafter, the LED 601 blinks in accordance with the data of Dio''Did by repeating turning on and off 601.

FIG. 5 shows an embodiment of the motor control circuit 1o shown in FIG. 2, where 101 is a control circuit that outputs a MOTO signal when the motor is driven, and 102 is a constant voltage circuit.
Upon receiving the OR5TART signal, it outputs a constant voltage vcl to the operational amplifier 103. The output of the operational amplifier 103 is connected to the transistor 105 through a resistor, and the collector of the transistor 105 (7) is connected to the power supply through a resistor 104 having a resistance value equal to the internal resistance of the motor, while the emitter is connected to the motor 11. Connecting. The operational amplifier 103 operates so that the voltage vM of the motor 11 and the constant voltage VC1 become equal. Buffers 106 and 107 transmit the voltage across the resistor 104 to the subtraction circuit 160. The subtraction circuit 106 outputs the voltage drop Vi across the resistor 104, and its outputs are connected to a subtraction circuit 161 and a differentiation circuit 162 via buffers 113 and 114, respectively.

The subtraction circuit 161 also has the motor one terminal voltage vM as a buffer 71.
Connected via 17') s 161 Ha vM-
The value of Vi is output. Differentiating circuit 1 for Vi
The output differentiated by 62 is connected to the comparator 127, and the comparator 127 output is connected to the constant voltage circuit 126 that outputs vc2, and the differential output ffi/dt
When the value becomes 708 or more, the output becomes high level, and its output is connected to the AND circuit 130. The MOTOR and 5TART signals are connected to the AND circuit 130 via a low-pass filter 163, and its output is connected to the set input of the 2-channel 132.

The MOTORSTA signal is inputted to the reset input of the latch 132 via an inverter 133. latch 1
The sample hold circuit is activated by the 5TART signal which is the output of 32, and the VM-Vi value at that time is
23 and outputted as vc via the buffer 122.

Between the motor terminal voltage vM and the motor current I, VM=I 10ωK ・・・・・・・・・・・・・・・
Mountain... (1) (K is a constant determined by the motor, ω is the rotational speed of the motor) stands X&D. Since the resistance value of the resistor 104 is selected so that Vi=I, -几, ω=VM-Vi......Mountain...
(2) Therefore, vc is a value proportional to the rotational speed of the motor, that is, the moving speed of the film.

FIG. 6 shows an embodiment of the timing generation circuit shown in FIG. 2, except that there are 155K subtraction circuits.

The output of 155 is E!, where the power supply voltage is E3 and the voltage drop across the diode 154 is VF. -V, -VC. This output is passed through a buffer 149 to a resistor 134.
It is connected to the. Transistors 135 and 136 conduct a current I equal to the current I flowing through resistor 134.

A current mirror circuit is formed so that the current flows, and the collector of transistor 136 is a capacitor. 137,
It is connected to the terminal of comparator 141. The output of the comparator 141 is connected to a constant voltage circuit 140 that outputs a constant voltage VCS, and the output thereof is connected to a monostable multivibrator 156. 156 is a trap so that when the output of the comparator 141 becomes high level, the output becomes high level for a certain period of time t1, and the output becomes O
It is connected to the circuit 147. The 5TART signal is input to the other input of the 0'kL circuit via the NOT circuit 146. The TCK signal is obtained by inverting the output of 147 by a NOT circuit 148. The output of 147 is resistor 13
9 to the base of a transistor 138 that shorts both ends of a capacitor 1370. 5TART
Simultaneously with the signal, the capacitor 137 is charged with the current I2, but the terminal voltage Vcj at this time is as follows, assuming that the capacitance is C. When the time T elapses, the output of the comparator 141 becomes high level, and the monostable multivibrator 1
56 is activated, the output of the OR circuit 147 becomes high level during tl, and the capacitor 137 is short-circuited by the transistor 138, so that Vci=0. From then on, t, + T
, = T;
Go back. Therefore, an ``I'CK signal with period ゛P; is generated.

If the time t, is set short enough so that t, <<'r, then T, -, T:, and therefore T; is proportional to the time required for the motor to rotate a certain amount. In other words, K is proportional to the amount of film movement. Therefore, the time required for the film to move by the distance shown in (a) Kd in FIG. 8 is equal to 'r; c3. If a constant of C9γ is selected, a timing pulse TCK will be generated every time the film moves by d.

Next, the operation of the embodiment will be explained.

When the control circuit 101 generates the MOTO5TART signal, the VCI voltage is applied to the motor 11 and it starts rotating. At this time, the current flowing through the motor changes as shown in FIG. 7(a), and the voltage difference Vi across the resistor 104 changes similarly. The differential value dV7/dt of Vi changes as shown in FIG. 7(b). The relationship shown in equation (2) above is established between the motor terminal voltage VM and the rotation speed ω of the vi1 motor, and since the value is constant, when 1 dVi/di l is below a certain value, the motor rotation The change in speed dω/dt is also smaller.

Therefore, when dVi/dt exceeds a certain value VC2 (V
(c2 is a value sufficiently close to 0) The change in the rotational speed of the motor is sufficiently small, and the change in the moving speed of the film is also sufficiently small. Therefore, ■ when the 5TART signal is generated and sampled and held. is a value proportional to the speed in the stable state of the speed shown in FIG.

Since the output of the subtracting circuit 155 is VCC'vy Vc, the resistance value of the resistor 134 is γ, and the torque between the transistor's pace and emitter is VBE, vFL:, Since VBE, L=''(Vcc-VsE(VCCVC)# -VC
...(3) r γ 8TAR,T (Until the number i arrives, the output of the OR circuit 147 is at a high level, the capacitor 131J is short-circuited, and the terminal voltage Vci of the capacitor 137 is 0.

Each time the TCK signal rises, the LED lighting circuit turns on the transistor 601, the LED blinks, and the data in the shift register group is shifted by one bit.

By repeating this operation, a 5×7 dot pattern is imprinted on the film.

In the embodiment, an LED and an optical system are used for imprinting, but instead, the blinking LCD panel may be illuminated from behind with a lamp. It goes without saying that the number of dots may also be increased as necessary.

Although the motor current was used to detect the film feeding speed, it is also possible to attach a generator to the motor and use the electromotive force to detect the motor speed.

In the embodiment, data is imprinted one frame at a time when the film is wound, but it is also possible to imprint the data by detecting the film moving speed during rewinding.

As mentioned above, the present invention detects the film feeding speed by the current and electromotive force flowing through the motor as shown in the embodiment,
With a simple configuration in which data is imprinted onto the film at a timing corresponding to the current feeding speed once the feeding speed becomes constant, the film feeding speed remains constant from the moment the motor starts, when the film feeding speed changes rapidly. Since no data is imprinted until the dots are digitized, this is an original feature of the dot imprinting method that makes it possible to imprint 9 numbers, etc., with uniform dot spacing, onto the film at constant character spacing. This is extremely effective when imprinting a large amount of various types of data.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a perspective view of the camera, Fig. 2 is a block diagram, and Fig. 3 is a circuit diagram showing a shift register group, an LTJD lighting circuit, and film sensitivity setting means. Fig. 4 is a circuit diagram of the shift register, Fig. 5 is a circuit diagram showing a motor control circuit, Fig. 6 is a circuit diagram showing a timing generation circuit, Fig. 7 is a waveform diagram showing waveforms of each signal, Fig. 8 9 is an explanatory diagram showing imprinted characters according to the present invention, and FIG. 9 is a diagram showing changes in film speed during film feeding. l...Data manual means, 2...Storage means, 3...
Decoder, 4...Shift register group, 5...LBD
. 6... LEiD lighting circuit, 7... Film sensitivity input means, 8... Lens, 9... Film, 10...
Motor control circuit, 11... Motor, 12... Drive gear, A... Camera. -1dl- (b) (C) ((2)

Claims (1)

[Claims] In a camera that flashes multiple imprint elements in conjunction with the film feeding operation to imprint characters, numbers, symbols, etc. on the film surface, it detects that the film feeding speed has become constant and imprints it. A first detection means that generates a start signal, a second detection means that detects the film feeding speed at that time, and a blinking interval of the υ imprinting element is controlled by the signal from the second detection means. A data imprinting camera characterized in that it is equipped with a means for recording data.