JPS63257738A - Film feeding device for camera - Google Patents

Abstract

PURPOSE:To shift a film to an unexposed frame without putting useless space between an photographed frame and the unexposed one by detecting the exchange of a battery and normally rotating or reversing a motor according to the transfer quantity of the film. CONSTITUTION:When a new battery 30 is connected after exchanged, the voltage of the battery is detected 43 and a CPU 37 transmits an action command to an up-down U/D counter 36 for counting the number of perforations and the motor 1. The exposed film 4 is taken-up to a spool 2 and the counter 36 counts up with the normal rotation of the motor 1. In detecting the stop by counting up, for example, the CPU 37 holds a counted value (n) at that time and stops the motor 1. Next, the CPU 37 compares the size of the counted value (n) with that of the counted value (m) before the exchange of the battery and outputs a count down command when n>m so as to reverse the motor 1. When the counted value goes to (n+8), the motor 1 is rotated reversely and the frame next to the exposed frame is positioned in an exposure frame 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic film feeding device for a camera.

[Conventional technology]

Recently, compact cameras have become more and more computerized, and the number of shots counters are also becoming electronic. Further, film feeding is automated by a winder using a motor, and all operations are performed according to a program, from the time the film is loaded into the camera to the time when the film is rewound after the end of shooting.

Among such electric cameras, a pre-winding type camera is provided. In a pre-winding type camera, after loading the cartridge into the camera, the motor is driven in forward rotation, and all unexposed film in the cartridge is pulled out and wound onto the take-up spool. It is designed to be driven in reverse so that the exposed film is wound into the cartridge one frame at a time. This pre-winding system has the advantage that external light does not reach the exposed film even if the back cover is opened during shooting, and there is no need to rewind the film after shooting is complete.

[Problem that the invention seeks to solve]

By the way, including the pre-winding camera mentioned above,
The camera operation sequence is electronically controlled.

In a controlled camera, if the battery runs out during use and the battery must be replaced, the following problems will occur. That is, the moment the old battery is removed for battery replacement, the contents of various memories used to control the camera's operating sequence are lost. Therefore, the electronic counter value that electronically counts the number of film shots is also reset, making it impossible to save the number of film shots taken before battery replacement.

As a result, even if a new battery is connected, the camera operation sequence will be restarted from the initial state.

In this way, if the camera's operating sequence is restarted from the initial state during use, even though some frames have already been taken, for cameras that feed the film in a sequential manner. , a blank feed for winding part of the film leader will be performed for 2.3 frames.
You end up wasting about 2.3 frames of unexposed film.

Furthermore, in a pre-winding type camera, the pre-winding mode is started by replacing the battery. Therefore, the photographed film is pulled out from the cartridge and photographing begins from this film, resulting in double exposure.

The present invention has been made in order to solve the drawbacks of the prior art, and it is possible to faithfully maintain the state before shooting even if the program is set to the initial state due to battery replacement in a camera that is electronically controlled based on a program. To provide a film feeding device for a camera, which reproduces images accurately and ensures photographing.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a detection means for detecting that a power battery is newly connected to the camera, a counting means for counting the number of perforations passed during film feeding, and the detection means A first driving means is provided which rotates the film feeding motor in one direction when a signal is obtained from the film and stops the motor when the film has been fed to the end. moreover,
After the driving of the motor is stopped by the first driving means, the motor is reversed by the second driving means, and the stop of this reversal is counted by the counting means when the film is fed by the first driving means. This is done by referring to the number of perforations passing through.

[Effect]

According to the above configuration, when battery replacement is detected by the detection means, the film is moved and stopped by the first driving means to the end side with the end of the film as a reference. Next, the film is fed by the second drive means in a direction opposite to the direction in which the film is transported by the first drive means. The drive stop means measures the amount of film transport for both by means of a counting means that counts the number of perforations passing through, and can move the film to unexposed frames without leaving unnecessary gaps between photographed frames. can.

Hereinafter, an embodiment of the present invention in a camera using a pre-winding type camera will be described.

〔Example〕

FIG. 3 is a diagram schematically showing a film feeding device using the present invention. A motor 1 for driving the camera is also used as a take-up spool 2 for the purpose of making the camera smaller. That is, the stator is used as a take-up spool 2, and the rotor is housed within this take-up spool 2. A plurality of claws 3 are formed on the outer periphery of the take-up spool 2, and perforations 4a of the photographic film 4 engage with the claws 3. From the top of the winding Lisbourg 2,
A rotating shaft 6 of the motor 1 with a drive gear 5 loosely fitted therein protrudes. The rotation of the drive gear 5 is transmitted to the spool drive gear 11 via gears 8, 9, and 10 forming a reduction gear train. The rotation of the spool drive gear 11 is controlled by a cylindrical leaf spring 12.
is transmitted to the take-up spool 2 via.

The rotation of the spool drive gear 11 is also transmitted to the gear 15 via the one-way clutch 14. A rewind claw (not shown) provided coaxially with the gear 15 engages with a spool 17 housed in the cartridge 16. The one-way clutch 14 is disengaged when the spool drive gear 11 rotates in the direction of the solid arrow, and the gear 15 is not driven. When the spool drive gear 11 rotates in the direction of the dashed arrow, the gear 15 is driven by the spool drive gear 11.

For detecting travel of the film 4, an LED 20 and a phototransistor 21 are provided so as to sandwich the perforation 4a at the shoulder of the exposure frame 22 from both sides. This phototransistor 21 turns on when it receives light from the LED 20, and turns off when no light is received due to light shielding. When the film 4 moves, the phototransistor 2I is connected to the perforation 4a.
Depending on the presence or absence of the LED 20, the light from the LED 20 is received or blocked, and turns ON and OFF repeatedly.

FIG. 1 schematically shows a motor control circuit using the present invention. A double-throw relay switch S2 is installed at both ends of the film feeding motor 1. S3 is provided. When the relay switch S2 is connected to the contact ``a'' and the relay switch S3 is connected to the contact ``a'', the motor 1 rotates normally to wind the film 4 onto the winding lisbourg 2. Conversely, when the relay switch S2 is connected to the contact a and the relay switch S3 is connected to the contact A, the motor 1 rotates in reverse to rewind the film 4 onto the cartridge 16.

In addition, as shown in the figure, relay switch S2.83 is connected to contact a.
When the motor 1 is connected to the motor 1, the motor 1 stops.

Transistors 31 and 32 each have a relay coil 3.
3.34 is connected. Transistors 31 and 32 are energized, that is, ON, when the input base is rHJ.
become. When the transistors 31 and 32 are turned on, the relay coils 33 and 34 turn on the relay switch S.
2. Switch S3 from contact A to contact S.

The up/down counter 36 has a count terminal (C), an up/down switching terminal (U/D), and a reset terminal (
R), and pulses are supplied from the photocoupler 20 to the count terminal. Further, a count up command signal or a count down command signal from the CPU 37 is input to the up/down switching terminal. When a count-up command signal is manually input to the up-down switching terminal, the up-down counter 36 counts while adding the pulses from the phototransistor 21, and when a countdown command signal is input, the pulses from the phototransistor 21 are inputted. Counting is performed by subtracting each input. As will be described later, the CPU 37 outputs a count-up command signal when winding the film 4 from the cartridge 16 immediately after replacing the dry battery, and outputs a count-down command signal when winding the film 4 into the cartridge 16, which is performed subsequently. Output. Further, in the photographing mode, a countdown command signal is outputted for counting by the number of sheets counter 40, and in the prewinding mode, for example, a countup command signal is outputted.

The CPU 37 constantly monitors the count output of the up/down counter 36, and controls the execution of a series of sequence programs based on this. For example, in the photographing mode, when the up/down counter 36 has been decremented by "8" by a pulse from the phototransistor 21, one pulse is output to the subtraction type photo number counter 40.

The number of subtracted pulses "8" is determined as the number of perforations corresponding to one frame of 35 mm full size film. thus,
When the CPU 37 outputs one pulse to the sheet number counter 40, the count value of the sheet number counter 40 is subtracted by "1", and this result is digitally displayed on a liquid crystal panel (LCD) 42 for displaying the number of remaining films. Ru.

Note that the switch S4 is a switch that detects the closing of the back cover of the camera, and when the back cover is closed with the cartridge 16 loaded, an activation signal is sent from this switch S4 to the CPU 37.

Further, an output terminal of a check circuit 43 that monitors the power supply voltage of the dry battery 30 is connected to the CPU 37 . This check circuit 43 detects that the voltage applied across it has risen from "0" to a predetermined level, and
Outputs a reset command signal to U37.

The operation of the present invention having the above-described configuration will be explained.

After loading the cartridge 16, when the switch S4 is turned on by closing the back cover, the CPU 37 is activated in the pre-winding mode.

As a result, the CPU 37 resets the up/down counter 36 and then sends out a count up command signal, and also sends out an rHJ signal (normal rotation start command signal to the motor 1) to the base of the transistor 31. Transistor 31 is turned on by this rHJ signal, and relay coil 3
3, the relay switch S2 is connected from contact a to contact S. At this time, the relay switch S3 remains connected to contact a, so that the motor 1 rotates in the normal direction, that is, in the direction that drives the take-up spool 2. When the film 4 is wound onto the spool 2 by normal rotation of the winding Lisbourg 2, the phototransistor 21 is repeatedly turned on and off as the film 4 travels.

When the entire film 4 is wound up from the cartridge 16 and the phototransistor 21 stops turning on and off, the up/down counter 36 stops counting up. While holding the count value at this time as rpJ, the CPU
37 detects that the count-up is not performed for a certain period of time, it sends an rLJ signal (a command signal to stop the forward rotation to the motor 1) to the transistor 31, and sets the relay switch S2 to contact a to stop the forward rotation of the motor 1. let

When the motor 1 stops in this manner, the CPU 37 electrically reads the well-known DX code provided on the cartridge 16, and thereby initializes the sheet number counter 40. For example, if 24 sheets of film 4 are used, "24" is set as the initial value.

When the prewinding mode is completed in this way, the camera is switched to the photographing mode. After the CPU 37 supplies a countdown command signal to the up/down terminal of the up/down counter 36, the transistor 32 is
When the signal (reverse rotation start command signal to motor 1) is supplied,
The motor 1 is rotated in the reverse direction by the same operation as when the motor 1 rotates in the normal direction. When the film 4 is fed in the direction of the broken line in this way,
The up/down counter 36 sequentially subtracts the counted value rpJ of the up/down counter 36 in response to the pulse signal supplied from the phototransistor 21. Then, when the number of reduced pulses reaches, for example, rmJ, the CPU
37, the CPU 37 supplies the rLJ signal (reverse rotation stop command signal to the motor 1) to the transistor 32 to stop the motor 1. The number of subtraction pulses rmJ is set based on the length of the rear end of the film (on the cartridge side) that is cut during film development processing, or the amount of motor drive for shutter charging.

When the release button 38 is pressed, a signal is sent from the release signal generation circuit 39 to the CPU 37. CPU37
Well-known distance measurement operation based on commands from.

After completing the photometry operation, the shutter opens and closes. When this shutter operation completion signal is fed back to the CPU 37, C
The PU 37 provides a reverse rotation start command signal to the motor l.

As a result, the exposed film 4 is transferred to the cartridge 16.
getting caught up in

Then, the up/down counter 36 performs a countdown operation by turning the phototransistor 21 ON and OFF. When the CPU 37 detects that the count value of the knob down counter 36 has been decremented by "8", the CPU 37 issues a reverse rotation stop command signal to the motor 1 and sets the sheet number counter 40 to "1". subtract only. As a result, the LCD 40 displays a number that is one less than the currently displayed number, that is, the number of remaining films that can be photographed, and photographing is performed sequentially.

By the way, if the dry cell battery 30 becomes exhausted while the photographing mode is being performed, rewinding of one frame will not start when the shutter is finished opening and closing. This is because the power consumption of the motor 1 that drives rewinding is the largest among the various operations of the camera, and the dry battery 30 is replaced when the motor 1 stops operating. Then, when the dry battery 30 that has been used until then is removed for battery replacement, no power is supplied to the CPU 37, sheet number counter 40, etc. Therefore, all the counts up to that point in the up/down counter 36 and the sheet number counter 40 will be lost.

When a new battery 30 is then connected, the check circuit 43 detects that the voltage applied to both ends of the battery has risen from "0" to a predetermined level. When this detection signal is input to the CPU 37, the CPU 37 starts up in a battery replacement mode according to the flowchart shown in FIG.

When the CPU 37 confirms the closure of mW by the signal indicating that the switch S4 is conductive, it sends a count-up command signal to the up-down counter 36, and
A forward rotation start command signal is sent to the motor 1. When the exposed film 4 is wound onto the take-up spool 2 by normal rotation of the motor 1, an up/down counter 36 performs a count-up operation. When all the film 4 is wound onto the take-up spool 2, the up/down counter 3
6 starts the count-up operation again from "0". C
For example, when the PU 37 detects that the count-up has stopped for one second, it holds the current count value rnJ and sends a normal rotation stop command signal to the motor l. When the motor 1 stops in this manner, the CPU 37 electrically reads the DX code and initializes the number of sheets counter 40 to "24" if the film 4 is a 24-shot type.

Next, the CPU 37 determines whether the count value rnJ of the up/down counter 36 is greater than or equal to the aforementioned "m". If "n">"m", the CPU 37 provides a countdown command signal to the up/down counter 36, and also provides a reverse rotation start command signal to the motor l. In this way, the exposed film 4 taken before the battery was replaced.
is caught up in Patrone 16, and the count number is r.
When the CPU 37 detects that the number of rotations has reached n, +8 J, the CPU 37 provides a reverse rotation stop command signal to the motor 1. In this way, if the reverse rotation of the motor 1 is stopped when the count reaches rn+8J, the next new frame will be positioned in the exposure frame 22 after the frame photographed before battery replacement is sent. The next photo shoot will be possible.

Note that rnJ≦rmJ means that the operation of the camera is interrupted immediately before the end of prewinding or before the film is continuously advanced by 4 armJ perforations after prewinding. In this case, the CPU 37 controls the rmJ of the perforation 4a.
Each piece of film 4 is rewound into the cartridge 16, and operations are performed according to the program of the above-mentioned photographing mode.

In parallel with the above-mentioned sending of the reverse rotation start command signal to the motor l, the CPU 37 performs the calculation of 24-[(n-m)/8) based on the above-mentioned rnJ in order to restore the LCD display to normal. The result of this calculation is displayed on the LCD 42 as the number of films remaining at this point.

The film 4 exposed in this way is transferred to the cartridge 16.
The unexposed film 4 stored in the camera is set in the exposure frame 22, and photographing is resumed with the number of remaining films normalized.

In addition, although the embodiment for a pre-winding type camera has been described above, it goes without saying that the same effect can be performed for a forward-winding type camera as well.

In addition, in the above example, after replacing the batteries, all the films 4 are wound from the cartridge 16 onto the take-up spool 2, and the film 4 is rewound based on the end of the film on the cartridge side. Regardless, contrary to the above, it is also possible to rewind the film 4 onto the cartridge 16 after replacing the battery, and then wind the film 4 onto the take-up spool 2 again to a predetermined frame position. In this case, when rewinding the film 4 into the cartridge 16, part of the film leader may
In order to prevent the film leader from coming off the claw 3 and getting caught in the cartridge 16, for example, the shoulder portion 4b on one side of the film leader is
It is preferable to stop the rewinding of the film 4 at the time when (FIG. 3) is detected.

〔Effect of the invention〕

According to the configuration described above, after replacing a new battery, the film is moved to the end of the film based on the end of the film, the state before the battery was replaced is restored based on this moving length, and the state before the battery is replaced is further restored. The film can be moved to an unexposed frame without leaving any unnecessary space between the frames. Moreover, since the film is moved based on the perforations, it is ensured. Therefore, when you change the battery and restart the camera in the middle of use, you can use the film efficiently without double-clicking on frames that have already been taken or unnecessarily advancing the film. In addition, it is possible to continue the camera operation sequence from the middle.

[Brief explanation of the drawing]

FIG. 1 schematically shows a motor control circuit using the present invention. FIG. 2 is a diagram showing a flowchart of a CPU using the present invention. FIG. 3 is a diagram schematically showing a film feeding device using the present invention. 1...Motor 2...Take-up spool 17...Spool 20...LED 21...Phototransistor 31...Transistor (for forward rotation) 32...Transistor (for reverse rotation) S2...Relay switch (for forward rotation) S3...Relay switch (for reverse rotation) S4...Switch

Claims (1)

[Claims] (1) A detection means for detecting that a power supply battery is newly connected; a counting means for counting the number of passing perforations during film feeding; a first drive means for rotating a motor in one direction and stopping the motor when the film is fed to the end; and a second drive for rotating the motor in the other direction after the first drive means has stopped. means and
The second driving means is operated by referring to both the number of passing perforations counted by the counting means when the film is fed by the second driving means and the number of passing perforations counted when the first driving means is feeding the film. What is claimed is: 1. A film feeding device for a camera, comprising drive stopping means for stopping the operation, so that the position of the film can be accurately determined when replacing the power source battery.