JPS60194434A - Display device of film travelling of camera - Google Patents

Abstract

PURPOSE:To confirm easily film travelling by displaying the contents similar to the film travelling only for a fixed period after end of the film travelling. CONSTITUTION:A film is wound up by motor force, a motor signal is inputted to a circuit AND1 and the circuit AND1 passes a film signal phi inputted from a waveform shaping circuit 1. The signal phi is inputted to a TR Tr through a circuit OR, the TR Tr is turned on and off in accordance with the signal phi and a lamp 4 is turned on and off to display the travelling of the film. At the completion of film winding, the motor signal is interrupted and the circuit AND1 interrupts the passage of the signal phi. On the other hand, a timer 13 outputs a signal only for a fixed period from the time of decay of the motor signal, the signal is inputted to a circuit AND2 and the circuit AND2 passes a false signal from an oscillator 2, so that the lamp 4 is turned on and off only for the fixed period and the film travelling can be confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a film travel display device for a camera, and more particularly to a film travel display device for an electric wind-up type camera.

(Prior art) With electric wind-up cameras, users tend to worry about whether or not the film is being wound properly by electric power. Some devices display the film running status by flashing lamps or by using a liquid crystal display element or the like. However, since film winding is performed immediately after shooting, and the time required for winding is short, unlike the film run display device of conventional cameras, the film advance display is performed immediately after shooting, and at the same time as the film is wound. However, it was difficult for the camera user to see the film travel indicator.

(Objective) The object of the present invention is to provide a film running display device for a camera that allows the film running to be easily checked by displaying a display similar to the film running display for a certain period of time even after the film has finished running. It is about providing.

(Structure) The film running display device for a camera of the present invention includes a film running signal generating section that issues a signal by electric winding, a pseudo signal generating section that issues a signal similar to the film running signal,
a switching section that passes the film running signal when the film running signal is being generated from the film running signal generating section, and passing the signal from the pseudo signal generating section for a certain period of time when the film running signal is interrupted; and a display section that displays film running based on a signal passing through the switching section.

The invention will now be described with reference to illustrated embodiments.

In FIG. 1, the signal φ input to the waveform shaping circuit 1 is a film running signal, and a film running signal generating section,
For example, it is generated by a free sprocket that rotates in conjunction with film running. The signal φ is shaped by a waveform shaping circuit 1 and input to an AND circuit ANDI. On the other hand, the motor signal generated when the film winding motor is winding the film is input to the AND circuit ANDI and the timer 13, and is also inverted by the inverter 1 and input to the AND circuit AND2. . timer 13
emits a signal for a certain period of time from the time when the motor signal falls, and this signal is input to the AND circuit AND2. The outputs of the AND circuits ANDI and AND2 are input to the OR circuit OR, and the transistor Tr is turned on by the output of the OR circuit OR, so that the display lamp 4 is turned on. A signal with a constant period is inputted from the oscillator 2 to the AND circuit AND2. The oscillator 2 constitutes a pseudo signal generator and generates a signal similar to the film running signal φ. AND circuit ANDI, A
As is clear from the operation described below, the circuit section including ND2 and timer 13 passes the film running signal φ when it is being generated, and keeps the signal from oscillator 2 constant when the signal φ is interrupted. It constitutes a switching section that allows only time to pass through. The lamp 4 constitutes a display section.

The operation of the above circuit example will be explained with reference to FIG. Assuming that the film is being wound by electric power, the motor signal is input to the AND circuit ANDI, and the AND circuit ANDI passes the film running signal φ input from the waveform shaping circuit 1. This signal φ is inputted to the transistor Tr through the OR circuit OR, and the transistor Tr is turned on and off according to the signal φ, causing the lamp 4 to blink to indicate that the film is running. When winding of the film by electric power is completed, the motor signal is interrupted and the AND circuit ANDI blocks the passage of the signal φ. On the other hand, when the motor signal falls, the timer 13 outputs a signal for a certain period of time from that point on, this signal is input to the AND circuit AND2, and the fallen motor signal is inverted by the inverter 11 and sent to the AND circuit AND2. Since it is input, the AND circuit AND2 passes the pseudo signal from the oscillator 2.

Therefore, instead of the film running signal φ, the lamp 4 blinks for a certain period of time using a pseudo signal from the oscillator 2, so that the user can easily confirm that the film has been running. be able to. The appropriate operating time of the timer 13 is about 2 seconds.

Note that the waveform shaping circuit 1 may be provided as necessary, and may be omitted in some cases.

Next, an example using a liquid crystal display element in the display section will be described. In FIG. 3, the film running signal φ is shaped by a shaping circuit 1, frequency-divided by a flip-flop circuit 3, and inputted to an AND circuit AND5. On the other hand, the motor signal corresponding to the operation of the film winding motor is input to the NOR circuit NOH, and the NOR circuit NOI+
The output of is input as a reset signal to the shift register 7 via the OR circuit 01?6, and is also input to the AND circuit AND.
3 is set to be input. A signal similar to the film running signal φ generated by an oscillator 2 serving as a pseudo signal generator is input to an AND circuit AND4. The output of AND circuits AND4 and AND5 is OR circuit O
It is designed to be input as a clock signal to the shift register 7 via R5. The outputs 01, 2, 03, and 04 of the shift register 7 are respectively input to the OR circuits 6-ORI, OR2, 0173, and OR4, and the outputs of the OR circuits are input to the liquid crystal drive circuit 5. is displayed on the display section 6 according to the output of each of the above OR circuits.
The liquid crystal display elements a, b, c, and d arranged in rows are driven. The output 05 of the shift] register 7 is input to an OR circuit 0116. The output 04 of the shift register 7 is also inverted by an inverter 3 and inputted to the counter 8 as a clock signal. The counter 8 has a function equivalent to a timer for displaying film running for a certain period of time, and is reset by inputting a release pulse.

The outputs Oa1 and a2 of the counter 8 are both OR circuits OR7
The output of the OR circuit OR7 is input to the NOR circuit NOR and the AND circuit AND4, and the output of the AND circuit A
It is inverted input to ND3 and the positive terminal of oscillator 2, and is further inverted by inverter I2, and then connected to AND circuit AND.
5 is entered. AND circuit AND3
The output of each of the OR circuits ORI, OR2, OR3, O
It is set to be input from 1 to 4. AND circuit AN
The circuit portion including D4 and AND5 constitutes a switching section.

Next, the operation of the above embodiment will be explained with reference to FIG. When a release pulse is emitted by releasing the camera, a shutter (not shown) operates, and when that operation is completed, a motor (not shown) is driven to wind the film. When such an operation is performed, the counter 8 is first reset by the release pulse. Next, when the motor is driven, a motor signal is output, the shift register 7 is released, the NOR circuit NOR is "L", and the AND circuit AND3 is r
LJ, and one of the inputs of the four OR circuits 0111 to OR4 becomes "L", so the liquid crystal display elements a% bz C- and d, which were all lit up until then, go out of smoke. When the film is wound by the motor drive, a film running signal φ is generated, and this signal φ is shaped by the shaping circuit 1, frequency-divided by the flip-flop circuit 3, and sent to the AND circuit AND5.
is input.

The other input terminal of the AND circuit AND5 is connected to the counter 8.
Since the output of rLJ is inverted and inputted to rHJ by the inverter I2, the AND circuit AND5 passes the film running signal and inputs it to the shift register 7 via the OR circuit OR5. The shift register 7 sequentially shifts each pulse of the film running signal, and outputs Q1,
Set Q2.03.04 to "H" one after another. Incidentally, in the timing chart of FIG. 5, eight pulses are emitted as the film running signal φ while the film is being fed one frame, and the frequency is divided into four pulses per frame by the flip-flop circuit 3. It has become. Each output of the shift register 7 becomes rHJ in sequence, so that their rHJ
Signals are sequentially inputted to the liquid crystal display drive circuit 5 via each OR circuit ORI to OR4, and the drive circuit 5 sequentially lights up the liquid crystal display elements arranged in a row in the display section 6 as a, ab, abc, abcd. To go. When the output port 4 of the shift register 7 becomes rHJ, this is inputted to the counter 8 as a clock signal, and the output Qal of the counter 8 becomes rHJ. This "H" signal is input to the AND circuit AND4 and is inverted to rLJ by the inverter I2, thereby closing the gate of the AND circuit AND5. Further, the rHJ signal from the counter 8 causes the NOR circuit NOR to become "L", and the gate 1 of the AND circuit AND3 is closed. Further, the reset of the oscillator 2 is canceled by the r HJ signal from the counter 8, and the oscillator 2 starts oscillating. The oscillation signal of oscillator 2 is generated by AND circuit AND4 and OR circuit OR.
5 to the shift register 7. The shift register 7 sequentially performs a shift operation using an oscillation signal from the oscillator 2 instead of the film running signal described above, thereby continuously driving the liquid crystal display element a % b % CSd. When the output 05 becomes rHJ due to its operation, the shift register 7 is reset via the OR circuit 0116 and performs the shift operation again, whereby the liquid crystal display elements a, b, c,
The sequential driving of d is repeated. The output 04 of the shift register 7, which is generated every time this sequential driving of the liquid crystal display elements is repeated several times, is counted by the counter 8, and when the counted value becomes a predetermined value, both the outputs Qal and OR2 are r.
When LJ is reached, each part returns to the initial -10- state, and the film running display on the liquid crystal display elements a, b, c, and d stops.

According to the above-mentioned embodiment, the film running display is continued for a certain period of time even after the end of the film winding operation by electric power, so that the film running display can be viewed reliably. In addition, if some problem occurs and the film is not fed correctly, the output 04 of the shift register 7 will not become "■1" because the film running signal φ will not be input, and the counter 8 will not be able to count. The oscillator 2 does not operate, and the film running display is not performed by the sequential operation of the liquid crystal display elements.

Therefore, there is an advantage that it is possible to identify whether or not the film has been correctly fed.

Note that the waveform shaping circuit 1 and the flip-flop circuit 3 do not necessarily have to be used. The count value by the counter 8 may be increased or decreased arbitrarily. Furthermore, the display element does not necessarily have to be a liquid crystal display element (a lamp, an LED, etc. may also be used).

It is convenient to change the display operation after the film has finished running in accordance with the power supply voltage, since it is possible to know the degree of consumption of the power supply battery. FIG. 5 shows one example of rounding to realize this, and the oscillator 2 as the pseudo signal generator in the embodiments of FIGS. 1 and 3 is configured as shown in FIG. This is what is shown. The circuit of FIG. 5 is based on an astable multivibrator including transistors Tri, Tr2, and its time constant setting capacitors c1 and C2 are charged by constant current driving of transistors Tr3 and Tr4.
, Tr4 are controlled by the resistor R1 and the constant voltage diode DI, so that when the power supply voltage is high, the oscillation frequency is high, and when the power supply voltage is low, the oscillation frequency is low.

If an oscillator like the one shown in Fig. 5 is used, the film travel indication after winding the film by electric power will be performed at a faster cycle when the power supply voltage is high, and at a slower cycle when the power supply voltage is low. You can know the extent of wear and tear. In addition, since the film winding speed changes depending on the degree of consumption of the power supply battery, if the film travel display after film winding is not related to the power supply voltage (if it is done, it will be displayed during film travel and after film travel is completed). However, the use of an oscillator as shown in FIG. 5 has the effect of eliminating the above-mentioned discomfort.

In order to eliminate the discomfort caused by the difference between the film running speed displayed during film running and the film running display speed after film running is completed, a circuit configuration as shown in FIG. 6 may be used. The basic components of the embodiment shown in FIG. 6 are almost the same as those of the embodiment shown in FIG. Explain with emphasis. In FIG. 6, counter 8
The output j of the OR circuit OR7 which inputs the outputs Qal and Qa2 is input to the OR circuit OR8 and the AND circuit AND7.The OR circuit OR8 further receives the output 03 of the shift register 7, and the AND circuit AND7 further receives the motor signal. The output 03 of the shift register 7 is inputted, and the output port 4 of the shift register 7 is inverted and inputted. The output f of the OR circuit 1i0R8 is input as a clear signal to the attenuator 13-run counter 10, and the output g of the AND circuit AND7 is input as a load signal to the launch circuit 11, as well as to the AND circuit AND8 and the AND circuit AND9. It is designed to be input in reverse. Oscillator 1 is used in AND circuits AND8 and AND9.
A pulse with a constant period is input from 2. AND circuit AN
The output of D8 is inputted to the counter 10 as an up signal, and the output of the AND circuit AND9 is inputted to the counter 1° as a down signal. Borrow output signal i of counter 10
is input to the counter 10 as a precent signal, and is also input to the AND circuit AND4.

The output terminals and input terminals of the counter 10 and the latch circuit 11 are connected to each other so as to exchange signals with each other. The rest of the structure is the same as the embodiment shown in FIG.

The borrow signal i from the counter 1° is the film running signal φ
The counter 10 constitutes a pseudo signal generator.

The operation of the embodiment shown in FIG. 6 will be explained with reference to FIG. Before the film winding operation by the motor is performed, the output of the NOR circuit NOR is rHJ, so the output of the AND circuit AND3 is rHJ, and all of the liquid crystal display elements a, b, c, d are lit. Then, when the motor is driven and a motor signal is input, all the liquid crystal display elements are extinguished, and when the film running signal φ is input, the third
Liquid crystal display elements a, b, c, d as in the embodiment shown in the figure.
will light up in sequence to indicate that the film is running. At this time, 3 is added to the input φ1 of the shift register 7.
With the second signal, the output port 3 of the shift register 7 becomes rHJ, the output f of the OR circuit OR8 becomes rHJ, and the counter 10 is released from reset. Next, when the motor is on, the AND circuit AND
The output g of 7 becomes "I", and the pulse from the oscillator 12 passes through the AND circuit AND8 to the counter 10.
The above signal g is input to the up side of r
The pulses from the development oscillator 12, which is the HJ, are added and counted.

At the same time, since the signal g becomes a load input to the launch circuit 11, the counted value of the counter 10 (this is referred to as A) is launched. When the output Q4 of the shift register 7 becomes rHJ, the output g of the AND circuit AND7 becomes rLJ, so the oscillator 1
The two pulse signals are input to the down side of the counter 1o through the AND circuit AND9, and the counter 10 performs a subtraction counting operation. When the counter 10 has subtracted an amount corresponding to the count value A, the counter 10 outputs a borrow signal i, which becomes a precent signal, so the counter 10 again cents the output of the latch circuit 11 (its value is A). , thus repeating the subtraction counting operation. The borrow signal i is input to the AND circuit AND4, and from the time the signal j becomes rHJ, that is, the output port 4 of the shift register 7 becomes rHJ, the borrow signal l is outputted through the AND circuit AND4. The borrow signal i is sent to the OR circuit OR5 instead of the film running signal φ.
The signal is inputted to the shift register 7 via. The shift register 7 sequentially shifts each time the signal i is input. When the output Q5 of the shift register 7 becomes rHJ, the register 7 is self-reset by the "H" signal via the OR circuit OR6. In this way, the signal i is transferred to the register 7.
Each time an input is made, the liquid crystal display element a % b −, C %
d lights up one after another. Then, such an operation is repeated several times, and the outputs Qal and Qa2 of the counter 8 counting the output port 4 of the register 7 both become rLJ.
Then, the signal j becomes “L” and the terminal φ of the register 7
There will be no pulse input to 1. At the same time, the output of the NOR circuit NOR becomes rHJ, so the four OR circuits ORI to OR
4 outputs are all rHJ, and liquid crystal display elements a, b, c
, d all light up to indicate that film is present), and the operation ends.

As is clear from the above operation, according to the embodiment shown in FIG. 6, from the time when the output 03 of the shift register 7 becomes "H", which is just before the end of the film running operation by the motor, until the output 04 becomes rHJ. The time is temporarily stored in the launch circuit 11, and the film running display is performed after the film has finished running according to the temporarily stored time. There is an advantage that the film running display cycle after the film winding is completed coincides, so there is no sense of discomfort.There is also the advantage that the degree of consumption of the power battery can be determined by the film running display cycle. Similar to the embodiment shown in FIG. 3, if the film is not running due to some abnormality, the sequential lighting operation of the liquid crystal display elements is not performed, so that it is possible to know whether the film is running abnormally.

(Effects) According to the present invention, in an electric winding camera, the same display as the film running display is displayed for a certain period of time even after the film has finished running, and the film running can be easily confirmed. play.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation of the same embodiment, FIG. 3 is a circuit diagram showing another embodiment of the present invention, and FIG. The figure is a timing chart for explaining the operation of the above embodiment, FIG. 5 is a circuit diagram showing an example of an oscillator that can be used in the present invention, and FIG. 6 is a diagram showing still another embodiment of the present invention. The circuit diagram and FIG. 7 are timing charts for explaining the operation of the same embodiment. 2. Pseudo signal generator (oscillator) 4. Display section 6.
・Display section ANDI, AND2...AND circuit forming the switching section 13...Timer forming the switching section
AND4, AND5...AND circuit constituting the switching section φ...Film running signal 11...Pseudo signal generation section (up/down counter) 19- & “H

Claims (1)

[Claims] In an electric winding type camera, a film running signal is generated from a film running signal generating section that issues a signal by electric winding, a suspicion signal generating section that issues a signal similar to the film running signal, and a film running signal generating section. a switching section that passes the same signal when the film running signal is interrupted, and passes the signal from the suspect signal generating section for a certain period of time when the film running signal is interrupted; and a film running display based on the signal that passes through this switching section. 1. A film travel display device for a camera, comprising a display section for displaying the camera film.