JPS6242137A - Frame position recording and detecting device for camera - Google Patents

Abstract

PURPOSE:To unload easily a film in the middle and to reload the film at the 1st unexposed frame by providing a means which records a frame position on the film surface and a detecting means which detects the record of the frame position on the film surface. CONSTITUTION:When an electromagnet 10 begins to be powered on and excited, a stopper claw 9 rotates counterclockwise and its restraint part 9a disengages from the arm 16b of a stamp lever 16. Then, the stamp lever 16 rotates counterclockwise and a stamp part 16c rotates through a window 1e while pressing the front side of an ink ribbon 22. At this time, while the surface of the film 3 facing the window 1e is marked by a stamp part 16b, light shield ink is applied. A high-level signal is outputted from a delay circuit right after the recording operation and inputted to a winding circuit. Then, the winding circuit is excited and a motor beings to rotate in the film winding direction, so that the film begins to be rewound from the middle.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention provides a camera frame position recording and detection device that is effective when a film that has been partially photographed is once taken out and then reloaded and the remaining frames are photographed. It is related to.

(Background of the Invention) A small number of camera users have a technique in which they rewind a film that has only been partially shot, take it out of the camera, then load a different film, take a picture, and then rewind the film. There are some people who use it in such a way as to use it. This happens, for example, when the camera is currently using a special type of film, or there is film in the camera that is being used by one individual, and a request is made to take a commemorative photo of a group event or trip. How to use it like this.

In recent years, high-speed films have been legally commercialized, and the number of film types is increasing, so it is expected that the number will increase. Also, especially with half-frame cameras that use 35mm roll film, the number of shots that can be taken is 2
Since the number of users is doubled, it is thought that the number of people who use the above method will no longer be limited to a small number of people.

By the way, if you try to use the above method with a conventional camera, remember the value on the film counter when rewinding the film, and the next time you use it, release the shutter in the dark until that value reaches that value, and then release the remaining number. It was necessary to take pictures, which was very tedious.

In addition, with cameras equipped with an autoloading function, the same pieces may not always be in the same place depending on the appearance of the league part (from the cartridge) when the film is wound onto the cartridge, so It is necessary to shoot from a point where the counter value has advanced two or three frames ahead of the last frame shot, which results in wasted film consumption.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems and provide a camera frame position recording and detection device that can easily take out the film halfway and reload it to the first unused frame. It is to be.

(Features of the Invention) In order to achieve this object, the present invention provides a recording means for recording frame positions on a film surface, and a detection means for detecting the recording of frame positions by the recording means from the film surface. The present invention is characterized in that the frame position is recorded when the film is taken out midway, and the record of the frame position is detected when the film is reloaded.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1.2 is a mechanical configuration diagram showing an embodiment of the present invention. In Fig. 1, l is the camera body, which is formed with a cartridge chamber 1a, a spool chamber 1b, an aperture IC that determines the size of the photographic screen, a sprocket hole 1d, and a window 1e used for recording or detecting the recording position. . 2 is a film cartridge 23 having a perforation 3a, 4 is a perforation 3a of the film 3,! - a tin rocket whose teeth 4a protrude from the tin rocket hole 1d toward the back cover side so as to be able to engage with each other, and which rotates in conjunction with the driving of the film 3; 5, the teeth of the sprocket 4; A sprocket switch is turned on and off by being pressed by 4a, and 6 is an elongated hole 6a, 6b.

An operating part 6C1, which is operated by the photographer to suppress the operation, has a raised part 6d that holds one end of the spring 7, and a jaw part 6e that engages with the arm part of a stamp lever, which will be described later. Fitted structural members 8a, 8b
It is possible to slide by being guided by. Reference numeral 9 denotes a stop pawl that is rotatably supported by a shaft (not shown), and has a tensioning part 9a, an armature part 9b that is attracted when the electromagnet 10 is excited, and a counterbalance part 9C. 11 in the clockwise direction, it stops at the position where it abuts against the stopper 12. 1
3 is a spring hanging member for the spring 11.

Reference numeral 14 denotes a mid-take-out switch which is turned on by pressing one contact piece 14a having a spring force by its end face when the intermediate take-out lever 6 is depressed, and comes into contact with the other contact piece 14b, and 15 is a stopper. , 16 is a stamp lever rotatably held by a shaft (not shown) fitted in a hole 16a, and includes an arm portion 16b, a stamp portion 16c, and a raised portion 16d that engages with the tensioning portion 9a of the stopper claw 9. and a hole 16e for holding one end of a spring 17 that urges the stamp lever 16 counterclockwise. Reference numeral 18 denotes a step lever rotatably held on a shaft 19 implanted in the stamp lever 16, which has an arm portion 18a that comes into contact with the raised portion 16d and a raised portion 18b that engages with a claw portion of a rotating drum, which will be described later. It is always biased counterclockwise by a spring 20. Reference numeral 21 denotes a spring hook member for the spring 20.

Reference numeral 22 denotes an ink ribbon impregnated with a light-shielding paint, and the first
The stamp lever 1 is stretched in a trapezoidal shape as shown in the figure.
6 rotates counterclockwise, the stamp part 16b pushes the film 3 through the window 1e to stamp (form a recess) on the film 3, and at the same time presses the ink ribbon 22 against the stamped emulsion side. In other words, the frame position is recorded. At the time of recording.

The movable pulley 25 moves substantially to the left in the figure against the force of a spring (not shown) to keep the tension of the ink ribbon 22 constant. 26 is a vertical portion 18 of the step lever 18.
The rotary drum has a claw portion 26a that engages with the lever 1. When the stamp lever 16 rotates in the counterclockwise 81 direction, the claw portion 26a is pushed by the vertical portion 18b of the step lever 18, and the 1
The ink ribbon 22 is rotated counterclockwise by the pitch (this means that the ink ribbon 22 has been fed by a fixed amount). Note that when the stamp lever 16 returns to the position shown in FIG.
It rotates clockwise against the force of the spring 20 and returns to the state shown in FIG. 1 in such a way as to overcome the claw portion 26a of the rotating drum 26. 27 is a light projecting element that projects light onto the film 3 surface through the light projecting lens 28 and the window 1e; 29 is a light projecting element that receives light reflected from the film 3 surface through the window 1e and the light receiving lens 30; The light-receiving element 31 is a reuse operation button used when you want to reload the film that has been taken out halfway into the camera and continue shooting from the frame following the previously used frame. When the operation is performed, the reuse switch 32 is turned on. FIGS. 2(a) and 2(b) are diagrams for explaining the recording position detection time and the recording time, respectively. 33 is a pressure plate for positioning the film 3, and has a hole 3 at a position facing the window 1e.
3a is formed, and a stamp pad 34 having a reflective surface 34a having almost the same reflectance as the emulsion surface of the film 3 is inserted into the hole 33a to a position slightly less than the thickness of the pressure plate 33. Fixed in condition. Reference numeral 35 denotes light-shielding ink printed so as to hide the part stamped by the stamp portion 16b of the stamp lever 16, and even if the film 3 is rolled up in the spool or cartridge z, the printed light-shielding ink 35 will not overlap. The combination of films prevents it from falling.

FIG. 3 is a block diagram showing one embodiment of the present invention. 3
6 is a release switch that is turned on when a release button (not shown) is pressed; 37 is a film presence/absence switch that is turned on when the film 3 is positioned facing the aperture 1c and turned off when it is not positioned; 38 to 42 is a pull-up resistor.

43 to 47 are inverters that output high-level signals when the respective switches are turned on; 48 is a known distance measuring circuit; 49 is an exposure control operation when a distance measurement completion signal is input from the distance measuring circuit 48; 50 is an AND game, 51 is an OR game, and 52 is an exposure control circuit that outputs a high level signal when the operation is started and ends, and 52 instructs to start film winding when a high level signal is input from the OR gate 51. A winding circuit instructs the motor drive circuit 54 to finish winding the film by inputting a high level signal from the OR gate 53, and 55 is a motor for feeding the film.

A counter 56 counts the number of times the sprocket switch 5 is turned on and off, and increments when the count corresponds to the number of times the sprocket switch 5 is fed. The counter 56 is reset when a high level signal is input from the inverter 43. 57 is a one-shot circuit that generates a pulse by detecting the rise of the on signal of the sprocket switch 5; 58 is an inverter; 59 is an AND game; 60 is an OR game; 61 is an oscillation circuit; 62.63
64 is a counter that counts pulses input from the oscillation circuit 61 through the AND gate 62 and is reset by inputting a high level signal from the AND gate 63, and is reset within a certain period of time. When the film is no longer stretched, that is, when the film is stretched, a high level signal is output. Reference numerals 65 and 66 indicate an or game, and 67 indicates an instruction to start film rewinding when a high level signal is input from the OR gate 65, and an instruction to end film rewinding when a high level signal is input from the OR gate 66, respectively. The motor drive circuit 5
This is a rewinding circuit for 4.

68 is a latch circuit that maintains the on state of the intermediate takeout switch 14, 69 is an OR gate, 70°71.72 is an AND gate, and 73 is a transistor that is turned ON when a high level signal is input from the AND gate 72. When the transistor 73 is turned on, the electromagnet 10 starts being energized. 74 is a delay circuit that outputs a high level signal to the OR gate 65 and the inverter 75 when a predetermined period of time (sufficient time to complete the recording operation on the film 3) has elapsed since the start of energization of the electromagnet 10; 76 is a latch circuit that maintains the on state of the reuse switch 32; 77 is an AND game;
78 is a drive circuit for driving the light projecting element 27, 79 is a resistor, and 80 is a reference voltage KVC inputted to its inverting input terminal, and a reference voltage KVC inputted to its non-inverting input terminal. Comparators 81 and 82 which compare the voltage generated at the connection point between the light receiving element 29 and the resistor 79 are AND gates.

Next, the operation will be explained. First, the normal photographing operation will be described. When the photographer presses a release button (not shown) and turns on the release switch 36, the output of the inverter 43 becomes a high level signal, the counter 56 is reset, and at the same time the distance measurement circuit 48 and the exposure control circuit 49 moves, and well-known distance measurement and exposure operations are started. Thereafter, when the exposure operation is completed, a high level signal is outputted from the exposure control circuit 49 to one input terminal of the AND gate 50. When the release switch 36 is turned off in this state, the output of the AND gate 50 is inverted to a high level signal, and this signal is transmitted to the OR gate 50.
1 to the hoisting circuit 52. Then, the winding circuit 52 issues an instruction to start film winding to the remote drive circuit 54, which causes the motor 55 to rotate in the winding direction.
Winding of the film 3 is started.

On the other hand, when winding of the film 3 is started, the film 3
As the sprocket 4 moves, the sprocket 4 begins to rotate, and in conjunction with this, the sprocket switch 5 repeatedly turns on and off. This on/off signal is input to the counter 56 via the inverter 44, and the number of on/off times inputted by the counter 56 is is counted. When the predetermined count number (number corresponding to - frame feeding) is finished, the counter 56
A high level signal is output from the AND gate 59 to one input terminal thereof. At this time, since the intermediate takeout switch 14 and the reuse switch 32 are not turned on, a high level signal is input from the input terminal 58 to the other input terminal of the AND gate 59. Therefore, the AND gate 59
A high level signal is output from. In this way, when a high level signal is output from the AND gate 59 and inputted to the reset terminal R of the hoisting circuit 52, the hoisting circuit 52 instructs the motor drive circuit 54 to complete hoisting, and - The film winding operation for the cut is completed.

Further, as mentioned above, during film winding, a high level signal is input from the winding circuit 52 to one input terminal of the AND gate 63, and the other input terminal is input to the one-shot circuit 5.
Since a pulse signal is input from 7, a high level signal is momentarily output from the AND gate 63 to the counter 64 every time the sprocket switch 5 changes from off to on, and the counter 64 is reset each time. Such a reset operation is constantly performed while the film 3 is normally wound.

When winding of a predetermined number of films 3 is completed and film tension occurs during film winding, the sprocket switch 5 will no longer be turned on and off repeatedly. Then, the counter 64, which counts the pulses input from the oscillation circuit 61 via the AND gate 62, is not reset for a certain period of time, and counts up until the OR gate 6
A high level signal is outputted to the rewind circuit 67 via the rewind circuit 5. This excites the rewinding circuit 67, instructs the motor drive circuit 54 to start rewinding, and the motor 5
5 rotates in the rewinding direction, and rewinding of the film 3 is started. At this time, since a high level signal is simultaneously input to the hoisting circuit 52 via the OR gates tso and s3,
The operation in the film winding direction by the winding circuit 52 is stopped.

After that, when the film 3 is wound into the cartridge 2 by a specified amount, the film presence/absence switch 37 is turned on, and a high level signal is input to the reset terminal R of the rewind circuit 67 via the inverter 45 and the OR gate 66. As a result, the rotation of the motor 55 in the rewinding direction is stopped, and the rewinding operation of the film 3 is completed.

Next, referring to FIG. 4, we will describe the operation when a film that has not yet been photographed is taken out midway and replaced with a new film of a different type, that is, when it is taken out midway. When the operator presses the operating section 6C, the intermediate extraction lever 6
slides in the direction of arrow A in FIG. 1 against the bias of the spring 7, and presses the contact piece 14a to turn on the mid-takeout switch 14, at the same time its jaw portion 6e separates from the arm portion 16a of the stamp lever 16. When the intermediate takeout switch 14 is turned on, the output of the inverter 46 is inverted to a high level signal, and this signal is held by the latch circuit 68 at the next stage. The high level signal held by the latch circuit 68 is also output to the winding circuit 52 via the AND gate 71 and the OR gates 69 and 51, so the winding circuit 52 is excited. As a result, the motor 55 begins to rotate in the film winding direction, and winding of the film 3 is started. When winding of the film 3 begins, the sprocket switch 5 begins to turn on and off as described above, and a pulse signal is input from the one-shot circuit 57 to one input terminal of the AND gate 70. At this time, since a high level signal is input from the winding circuit 52 to the other input terminal of the AND gate 70, the output of the AND gate 70 becomes a high level signal. Therefore, the output of the AND gate 71 also becomes a high level signal, and this signal is input to the winding circuit 52 via the OR gate 53, so that the film winding operation is immediately stopped (see FIG. 4). Also, the AND gate 71
In addition to the delay circuit 74, the high-level signal output from the transistor 73 is also output to the AND gate 72, which has a high-level signal input to one of its input terminals via the inverter 75. It is turned on, and energization to the electromagnet IO starts (see FIG. 4).

When electricity is started and the electromagnet 10 is excited as described above,
Since the armature portion 9b is attracted by the electromagnet 10, the stopper claw 9 rotates counterclockwise, and its tensioning portion 9a is disengaged from the arm portion 16b of the stamp lever 16. Then, the stamp lever 16 rapidly rotates counterclockwise according to the bias of the spring 17, and as a result, the stamp part 16c
While pushing the front side of the ink ribbon 22, the ink ribbon 22 is rotated through the window 1e to the position shown by the dotted line in FIG. 2(b). At this time, the three sides of the film facing the window Ze are stamped by the stamp part 16b, and at the same time, the light-shielding ink 3 is applied to that part.
5 is printed (see FIG. 2(b)). Immediately after the recording operation as described above is completed, a high level signal is output from the delay circuit 74, and this signal is input to the rewind circuit 67 via the AND gate 82 and the OR gate 65. As a result, the rewinding circuit 67 is excited, the motor 55 begins to rotate in the film rewinding direction, and rewinding of the film 3 from the middle is started (see FIG. 4).

On the other hand, when the photographer stops pressing the intermediate take-out lever 6, the intermediate take-out lever 6 returns to the state shown in FIG. 1 by the action of the spring 7. Similarly, at this time, the arm portion 16a of the stamp lever 16 is also pushed by the jaw portion 6e of the rewinding lever 6 in the direction against the spring 17, so that the first
Return to the state shown in the figure. Also, during the printing operation of the stamp lever 16, the advance lever 18 hooks the claw portion 26b of the rotating drum 26 to rotate the rotating drum 26 counterclockwise by one pitch, thereby renewing the usable surface of the ink ribbon 22. .

Thereafter, when the film 3 is wound into the cartridge 2 by a specified amount as described above, the film presence/absence switch 37 is turned on and the film is passed through the inverter 45 and the OR gate 66 to the rewind circuit 67.
A high level signal is input to the reset terminal R of the motor 55, and the rotation of the motor 55 in the rewinding direction is stopped.
The midway rewinding operation of the film 3 is completed (see FIG. 4).

Next, the case where the film 3 which has been rewound halfway as described above is used again will be described with reference to FIG. After the film 3 is loaded into the camera, when the photographer presses the reuse button 31, the reuse switch 32 is turned on (see FIG. 5), and the output of the inverter 47 becomes a high level signal. The signal is inverted and held by the latch circuit 76 at the next stage. The high level signal held by the latch circuit 76 is transmitted to the OR gate 69 in addition to the AND gate 77.
Since the signal is also output to the hoisting circuit 52 via the lines 51 and 51, the hoisting circuit 52 is excited. As a result, the motor 55 begins to rotate in the film direction, and winding of the film 3 is started (see FIG. 5).
When winding starts, the sprocket 4 begins to rotate as the film 3 moves as described above, and in conjunction with this, the sprocket switch 5 repeats on and off, and this on/off signal is counted by the counter 56, and the number is counted. When the number reaches a predetermined number, the counter 56 outputs a high level signal.

In this case, since the output of the inverter 58 is a low level signal, the output of the AND gate 59 is not inverted to a high level signal. Therefore, such film winding operation is continued until the end, that is, until the film is stretched.

If film tension occurs during film winding, the tin rocket switch 5 will no longer turn on and off repeatedly as described above, and the counter 64 will not be reset for a certain period of time, so a high level signal is sent from the counter 64 to the rewind circuit 67 via the OR gate 65. is output, and the motor 55 rotates in the rewinding direction due to kneading, and the film 3
The rewinding of is started (see FIG. 5).

At the same time that winding of the film 3 is started, a high level signal is output from the AND gate 77, the drive circuit 78 is operated, and the light projecting element 27 emits light.

Further, when the AND gate 77 starts outputting a high level signal, the AND gate 81 outputs the comparator 8.
A state is reached in which the output state of 0 can be directly transmitted to the rewinding circuit 67 via the OR gate 66. The light emitted from the light projecting element 27 enters the film 3 through the light projecting lens 28 and the window 1e, and the light at this time is reflected by the surface of the film 3, passes through the window 1e and the light receiving lens 30, and is transmitted by the light receiving element 29. The structure is such that the position where the light is received (see FIG. 2(a)), that is, the state of reflection IE on the film 3 surface by the light emitting element 27 and the light receiving element 29 can be observed and the recorded position can be detected. 0 Normally (when light is hitting an unrecorded area), more than a certain amount of light enters the light receiving element 29, so the resistor 79 and the light receiving element 29
The voltage value generated at the connection point is lower than the reference voltage -KVC, and a low level signal is output from the comparator 80, so that the film rewinding operation is not stopped.

After that, the film 3
When the film is rewound, the light emitted from the light emitting element 27 is blocked by the light shielding ink 35 recorded on the third surface of the film, so that the reflected light becomes less than a certain predetermined value and is no longer received by the light receiving element 29. . Then, the output of the comparator 80 is inverted to a high level signal (see FIG. 5), and this signal is passed through the AND gate 81 and the OR gate 66 to the reset terminal R of the rewind circuit 67 and the reset terminal H of the latch circuit 76. Now you can input.

As a result, when the film rewinding operation is stopped, the latch circuit 76 is reset and all operations are completed. In this case, there is a time lag between when the rewind circuit 67 is reset and when the motor 55 actually stops, so that the film 3 will stop at a position slightly rewound from the position where recording was detected. However, as mentioned above, since the film is slightly wound up during unloading, the film 3 will stop at approximately the position of the frame next to the last frame photographed last time.

Figure 6 shows a block diagram when the present invention is applied to a camera of the type that takes pictures while winding the entire film and then rewinding it.The same parts as in Figure 3 are denoted by the same symbols. . 83 is a back cover switch that is turned on when the back cover is closed; 84 is a pull amplifier resistor; 85 is an inverter; 86 generates a pulse signal at the rising edge when the output of the inverter 85 is inverted from a low level to a high level signal; One-shot circuit for exciting the hoisting circuit 52, 87
94 is an OR game, 95 is a one-shot circuit that generates a pulse signal by inputting a high level signal from the latch circuit 68 via the OR gate 51.88, and excites the winding 1 circuit 67, and 96 is an AND gate. It is.

Next, the operation will be explained. When the film 3 is loaded into the camera and the back cover is closed, the back cover switch 83 is turned on and a pulse signal is generated in the one-shot circuit 86.

Then, the winding circuit 52 instructs the motor drive circuit 54 to start film winding, the motor 55 rotates in the winding direction, and winding of the film 3 is started. When winding of the film 3 is started, the sprocket switch 5 is repeatedly turned on and off as described above, and the one-shot circuit 5 is turned on and off each time.
Since the pulse signal generated at 7 is input to the counter 64 via the AND gate 63, the counter 64 is reset and the winding operation continues.

When the film 3 has been wound to the end and the sprocket switch 5 is no longer turned on and off for a certain period of time due to film tension, the counter 64 counts up and outputs a high level signal. As a result, the winding circuit 52 and the counter 87 are reset, and at the same time, the high-level signal is input to the rewinding circuit 67 via the OR game 92 and 88, so the rewinding circuit 67 is excited and the film 3 is Rewinding begins. - When the cut film 3 is rewound, a high level signal is output from the counter 56, and the rewind circuit 6
7 is reset and the rewinding operation is stopped. This completes the preparation for shooting.

Next, a case will be described in which the film is replaced during shooting in the one-rewind direction. Operation section 6C depending on the photographer
When is pressed, the halfway takeout lever 6 slides in the direction of arrow A in FIG. 1 as described above, the halfway takeout switch 14 is turned on, and the state of the switch is latched by the latch circuit 68. The output of the latch circuit 68 is the one-shot circuit 95
．． Since the signal is sent to the rewinding circuit 67 via the (or game) 51 and 88, the rewinding circuit 67 is excited and rewinding of the film 3 is started. Then, after some rewinding,
The sprocket switch 5 begins to turn on and off, and the one-shot circuit 57 outputs a signal at l\i level, and this signal is sent to the AND gate 71 and the OR gates 89 and 9.
0.91 to the reset terminal R of the rewind circuit 67, the rewind operation is temporarily stopped. Also, at this time, the transistor 73 is turned on, and energization to the electromagnet 10 is started.
Recording is performed on three sides of the film by a recording means as shown in FIG.

Thereafter, when the delay circuit 74 finishes outputting a high-level signal and the intermediate take-out switch 14 is turned off, the output of the AND gate 82 becomes a high-level signal, and this signal is again input to the rewind circuit 67. Therefore, rewinding is restarted, and this rewinding operation is stopped by the film presence/absence switch 37.
In other words, until the film 3 is turned on, the specified amount of film cartridge 2
This is done until it gets caught up in.

Next, a case will be described in which the recorded film 3 is used again. Film 3 is loaded and reuse button 3
When the back cover is closed after the operation 1 is performed, the winding circuit 52 is excited by the one-shot circuit 86, and winding of the film 3 is started.At the same time, the inverter 47, the latch circuit 76, and the AND gate 96. Since each output of 77 becomes a high level signal, the drive circuit 78 operates and the light emitting element 27 emits light, so that the recording position on the three sides of the film is detected by the light emitting element 27 and the light receiving element 29. Become. After that, when the recording position is detected, the high level signal output from the AND gate 81 is transmitted to the OR gates 94 and 9.
3 to the reset terminal H of the winding circuit 52, the latch circuit 76 is reset at the same time as the film rewinding operation is stopped. As a result, the film 3 is stopped at approximately the next frame after the last frame photographed last time.

FIG. 7 shows another embodiment of the invention. The same parts as in FIG. 1 are represented by the same symbols. In this embodiment, a stamp lever 97 records the frame position on the three sides of the film (only stamping is performed, no printing is performed), and a recording detection lever 98 and a recording detection switch 99 detect the position.

Normally, the stamp lever 97 is locked at the position shown by the dotted line in FIG. 7 by a stopper claw (not shown). When taking it out midway, the locking by the stopper claw (not shown) is released,
It rotates counterclockwise about the shaft 100 according to the bias of the spring 101. At this time, the stamp portion 97a suddenly protrudes from the hole 102a formed in the camera body 102,
As shown by the solid line in FIG. 7, the film 3 is pressed against the portion 103a formed on the pressure plate 103 to mark the recording position on the surface of the film 3.

The recording detection lever 98 has one end 98a fitted into a hole 102a formed in the camera body 102, and is biased by a spring 104 so that the tip always contacts the surface of the film 3. At this time, the recording detection switch 99 is in an on state because one contact piece is pressed by the other end 98b of the recording detection lever 98. When the film 3 is rewound to the position stamped by the stamp lever 97, recording is detected, and the tip of one end 98a of the 8-98 enters that part according to the bias of the spring 104, and moves slightly to the left in the figure. The recording detection switch 99 is turned off. When the recording detection switch 99 is turned off in this way, a circuit (not shown) detects that the recording position has been reached, and the film rewinding operation is stopped at the position of approximately the next frame after the last frame photographed last time.

In this embodiment, unlike the embodiment in FIGS. 1 to 6, the stamp lever 97 for recording and the recording detection lever 98 for detecting its position are configured to have different phases. Unlike the embodiments shown in FIGS. 1 to 6, there is no need to perform a slight winding or rewinding operation during unloading, and there is an advantage that the circuit configuration is simpler than the above-mentioned embodiments.

According to the embodiment shown in FIGS. 1 to 7, when a film that has been partially photographed is once taken out, a record is made on the film surface of the next frame after the last photographed frame to indicate its position, and when the film is used again. Since the recording position is detected and film rewinding is stopped immediately upon detecting the recording position, the position of the frame following the last photographed frame can be accurately and easily set at a position facing the aperture LC. becomes possible. Also, when reusing the film, the first
In the embodiment shown in Figure 5, the rewinding operation is performed once the film has been wound to the end, and when the first recording position is detected midway through the rewinding operation, the rewinding operation is stopped. Since each winding operation is configured to stop when the first recording position is detected,
Even if the film is recorded in many places, the position of the next frame after the last frame can be accurately and easily detected. In addition, from the above, you will no longer waste film as in the past, and you will be able to use different types of film depending on the scene, and you will be able to buy film with a large number of sheets, such as 36-sheet film, to save money. It will be possible to take photos. Furthermore, if such cameras become widespread in the market,
When you go on a trip, you can take a roll of film with you and take pictures using the camera wherever you go, which is very convenient.

For example, if you want to shoot up to 10 frames on a certain film, you can release the camera in the dark until the 10th frame, record the position when it reaches that position, and record the record as you continue shooting. Once the position has been detected, further photography can be stopped and the film can be taken out midway.

(Correspondence between the invention and the embodiment) In the embodiment shown in m1 to 7, from the stamp lever 16 to the rotating drum 26, the stamp lever 97, and the spring 10
1 corresponds to the recording means of the present invention, and from the light emitting element 27 to the light receiving lens 30, the drive circuit 78, the resistor 79, the comparator 80, the AND gate 81, the recording detection lever 98, and the recording detection switch 99 correspond to the detection means. do.

(Modified example) In the embodiments of FIGS. 1 to 5, recording was performed on the upper part of the perforation 3a of the film 3, but this may be any part as long as it is outside the photographing screen, for example, the window 1e and the sprocket. Depending on how the phase is set in step 4, it is possible to record even between the perforations 3a, and of course there is no problem in detecting this recording position. Since the reflective surface 34a of the stamp pad 34 has almost the same reflectance as the emulsion surface of the film 3, there is no problem even if the light from the light projecting element 27 is incident on the perforage mushroom 3a, and the light-shielding ink 35 It is possible to detect the position of

(Effects of the Invention) As described above, according to the present invention, a recording means for recording frame positions on a film surface, and a detection means for detecting the recording of frame positions by the recording means from the film surface. The frame position is recorded when the film is unloaded midway, and the record of the frame position is detected when the film is reloaded, making it easy to unload the film midway and reload the first unused frame. It becomes possible to do so.

[Brief explanation of the drawing]

FIG. 1 is a mechanical configuration diagram showing an embodiment of the present invention, FIGS. 2(a) and 2(b) are diagrams respectively explaining recording position detection and recording, and FIG. 3 is a block diagram thereof. Figure 4 also shows the time chart when the film is taken out halfway, and the 5th
6 is a block diagram showing another embodiment of the present invention, and FIG. 7 is a mechanical configuration diagram C showing another embodiment of the present invention. 2...Sprocket, 3...Film, 4...Tin rocket, 5...Sprocket switch, 6...Midway extraction lever, 9・
...Stopper claw, 10...Electromagnet, 14
...Midway ejection switch, 16...Stamp lever, 22...Ink ribbon, 27...
...Light emitting element, 29... Light receiving element, 32.
...Reuse switch, 52...Hoisting circuit, 54...Motor drive circuit, 55...
Motor, 67...Rewinding circuit, 68.76...
... Latch circuit, 78 ... Drive circuit, 80.
...Comparator, 97...Stamp lever. 98... Recording detection lever, 99... Recording detection switch. (a) Figure 2 (b) Figure 4 Figure 7

Claims (1)

[Claims] 1. Recording means for recording the frame device on the film surface;
A frame position recording and detection device for a camera, comprising: detecting means for detecting the recording of the frame device by the recording means from the film surface.