JPS63177120A - Data imprinting device - Google Patents

Abstract

PURPOSE:To make the imprinting position of respective data corresponding to respective photographic frames securely coincident with one another by detecting the head position of a final photographic frame and then imprinting data for a 1st time without imprinting the data simultaneously with the start of the rewinding of a film. CONSTITUTION:A data imprinting inhibiting means 204 inhibits imprinting operation from being instructed by a control means 202 until the head position of a final photographic frame is detected by a frame head position detecting means 203, and allows the indication of the imprinting operation for the 1st time when confirming the detection. Therefore, the imprinting of the data after the start of rewinding is performed after the head position of the final photographic frame is confirmed, and data corresponding to the photographic frame which is stored last is imprinted securely in the photographic frame. The correspondence between said final photographic frame and data imprinted there in matches with the correspondence relation between respective following photographic frames and data, so coincidence is naturally obtained. Consequently, corresponding data are imprinted in all photographic frames.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an improvement in a data imprinting device that imprints data such as the shooting date on the film surface using a data imprinting means while the film is being fed. .

(Background of the Invention) A conventional device of this kind stores imprint data such as the shooting date in a memory at the time of release, reads the data from the memory and imprints it on the film surface while rewinding the film. proposed a system (Japanese Unexamined Patent Publication No. 60-254
123, etc.) is compact and capable of imprinting multiple digits and various types of data, and is particularly effective for cameras that feed film using a motor. However, in a camera that uses a motor to feed the film, the film is first wound up after the release is completed, and if it is detected that the film is stuck and winding cannot be completed, the motor is energized in the winding direction. is configured to immediately stop and start energizing in the rewinding and rewinding directions.

For this reason, the film position at the start of rewinding and the film position at the time of release to photograph the final frame were not necessarily the same, and sometimes the data to be imprinted on each frame was different. In some cases, the image was imprinted on the photographed frame. This is due to the fact that the film position when rewinding is started after the film is stuck and the film position when the film is released does not match. Currently, no countermeasures have been proposed for the deviation of the imprinting position of each data corresponding to each photographic frame.

(Object of the Invention) The object of the present invention is to prevent data that should be imprinted on other photographic frames from being imprinted on the final photographic frame.
It is an object of the present invention to provide a data imprinting device that can reliably match the imprinting positions of each data corresponding to each photographic frame.

(Features of the Invention) In order to achieve the above object, the present invention includes a barrel head position detecting means for detecting the leading position of the last photographed frame from a position signal indicating a change in film position that occurs when film rewinding is started; An imprinting prohibiting means is provided which prevents the control means from instructing the imprinting means to imprint data until the leading position of the final frame is detected by the barrel head position detecting means, thereby preventing film rewinding. Rather than imprinting the data at the same time as the start, the data imprinting operation is performed only after the starting position of the final photographed frame has been detected to ensure accuracy in the correspondence between the final photographed frame and the data imprinted there. , the subsequent correspondence between each piece and the data is also naturally accurate.

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

FIG. 1 shows the basic configuration of the present invention, and its operation will be explained below.

A position signal indicating the state (position) of the film at the time of rewinding the film is sequentially sent from the film state detection means 201 disposed on the camera side, and this position signal is transmitted to the control means disposed within the data imprinting device. 202 and the trunk head position detection means 203.

The torso head position detection means 203 detects whether a signal indicating the head position of the final photographed frame has been input from the position signal, and the result is sent to the data imprinting prohibition means 20.
Tell 4. The control means 202 includes a storage means 20 that stores imprint data such as the photographing date corresponding to each frame.
Step 5 first reads data corresponding to the final photographed frame, and causes the data imprinting means 206 to imprint the data at a predetermined position of the final photographed frame based on the position signal inputted from the film state detection means 201. It is something.

Further, the data imprinting prohibition means 204 prohibits the control means 202 from instructing the imprinting operation (to the data imprinting means 206) until the leading position of the final photographed frame is detected by the trunk head position detecting means 203. , the instruction for imprinting operation is allowed only after it is confirmed that the image has been detected. Therefore, the data imprinting operation is executed after the start position of the last photographed frame is confirmed after the first rewind has started, so that the photographed frame definitely corresponds to the frame that was last stored. The data will be imprinted. Furthermore, the correspondence between the subsequent photographed frames and the data will naturally match because the correspondence between the final photographed frame and the data imprinted thereon is the same.

Therefore, it is possible to imprint data corresponding to each photographic frame over all photographed frames.

2 to 4 show specific examples of the embodiment shown in FIG. 1, and FIGS. 2(a) and 2(b) are perspective views showing various states when the device of the embodiment is attached to a camera. Yes, Figure 3(a)
(b) and (c) are a plan view, a back view, and a perspective view of the main parts, and FIG. 4 is a block diagram of a specific example.

In Figures 2 (a) and (b), 1 is the camera body, 2 is a data imprinting device, 3 is an LCD (liquid crystal display) that externally displays imprinted data such as the shooting date, and 4 to 11 are imprinters. Keys used when setting or modifying included data, 4 is the clear key, 5 is the cursor (←) key, 6 is the down key, 7 is the up key, 8 is the cursor (→) key, 9
is a set key, 10 is an on/off key for setting the imprint flag to "1" or O, 11 is a rewind key, 12 is a film, 13 is a pressure plate, and 14 is a rewinding direction of the film 12. is 7 LEDs in orthogonal directions
An LED array 15 is a light source for data projection in which (light emitting diodes) are lined up, and 15 is an imaging lens arranged in front of the LED array 14.

3(a), (b), and (e), 16 is a photographic lens, 17 is a back cover, 18 is a cartridge, and 19 is a film rewind motor that is driven and controlled by a camera control circuit, which will be described later. 19 rotates, the fork 21 rotates via the two-stage gear 20, and rewinding of the film 12 is started. 22 is an aperture, and 23 is a sprocket having teeth that mesh with the perforations of the film 12, which begin to rotate as the perforations move as the film is rewound. 24 is a sprocket gear that is fixed to the upper part of the sprocket 23 and moves in the same way; 25 is a signal gear that rotates when the output of the sprocket gear 24 is transmitted; and 26 is fixed to the lower surface of the signal gear 26. The signal contact piece 27 has three patterns 27a to 2 as shown in FIG. 3(c).
7c and output pins connected to each other (the detailed configuration will be described later using FIG. 5), and the position of the film 12 is detected by the signal contact piece 27 sliding on the board. and the data imprinting timing is detected.

28 is a main plate, and 29 is a winding Lisbourg.

In FIG. 4, 100 is a microcomputer that controls the entire data imprinting device 2, and includes a CPU 100a which has a built-in 7 lip-flop circuit and a 0N10FF judgment register, which is necessary for various data from the camera and when imprinting data. RAM 100b for storing information;
ROM in which data imprinting procedures are programmed
100c, l10100d-100ht-equipped.

101 is a crystal oscillator that generates a reference clock; 102 is an operating member corresponding to the various keys 4 to 11 shown in FIG. 2(a); and 103 is an LCD 3 that displays data for imprinting.
104 is a display drive circuit that drives the LED array 14, which is a light source for data imprinting, according to a signal from the microcomputer 100;
Reference numeral 105 denotes an external additional RAM that stores photographic information from the camera and data for imprinting.

Reference numeral 106 performs camera exposure control and film feeding control according to the film position signal from the signal board 27, as well as shooting information (shutter time, aperture value, ISO value, exposure compensation value, etc.), data imprinting timing signal, etc. A camera control circuit 107 performs serial communication to the microcomputer 100 in the data imprinting device 2, and a camera control circuit 107 is turned on and off according to a signal from the camera control circuit 106.
A switching transistor 108 is used to turn on or cut off power to the motor 19, and a code 108 indicates a blank when data to be imprinted is stored in the imprint data storage area (details will be described later) in the external expansion RAM 105. It is a switching transistor that is turned on when a code other than the above is stored and turned off when the rewind key 11 is pressed, and the collector of the switching transistor 108 and the base of the switching transistor 107 are connected. A battery 109 is a power source for the rewind motor 19.

Next, the signal board 27 and the signal contact piece 26 that slides thereon will be described in detail with reference to FIG.

FIG. 5(a) shows the signal board 27 fixed to the base plate 28 of the camera. A signal contact piece 26 attached to the lower surface of the signal gear 25 rotates and slides on this signal board 27 in the direction of arrow X when winding the film, and in the direction of arrow Y when rewinding the film. In either case, the signal contact piece 26 is for 1 frame (35 mm film: 3 frames).
8mm) When the film is fed, it passes 1 on the signal board 27.
It is configured to rotate. Three types of patterns 27a to 27c are formed on the surface of the signal board 27, of which pattern 27c is held at ground (GND) potential.

When the release is performed and the photographing of a certain frame is completed, the control circuit 106 of the camera controls the drive of a winding motor (not shown), and winding of the film 12 is started. Then, the state shown in FIG. 5(a) (all patterns 27
The signal contact piece 26 positioned astride (a to 27c) begins to rotate in the direction of the arrow
7a and 27b are closed and opened with respect to the pattern 27c. FIG. 5(C) shows the pattern 27a at this time.

The outputs P, , P2 from 27b are shown in Figure 5 (
When the signal contact 26 is in the position shown in a), both patterns 27a and 27b are closed (on) with respect to 27c, and this state corresponds to the position of STP 1 in FIG. 5(C). .

As the film winding progresses and the signal contact piece 26 comes to cover the area A of the pattern 27a carved at the pitch angle α, 1 of the output P1 corresponding to 1 pitch of the pattern 27a
The interval of the pulse period T is the feeding amount of the film 12 (=a
/360 degrees ), and by detecting the period T of this output P1 over time, the camera control circuit 106 can detect a power failure during film feeding, or abnormal film tensioning or rewinding as described below. etc. are detected.

As the film winding progresses further, the output P2 is turned on again, and then the output P-o is also turned on. When the output P2 is turned on, the camera control circuit 106 performs power supply control to a winding motor (not shown), that is, duty control (reducing the effective value of the current flowing to the winding motor) to reduce the winding speed of the film 12. By simultaneously detecting that the primary output P1 is on, the winding motor is de-energized and a film winding prohibition operation (braking operation) is performed.
1) The winding up of the trunk is completed. In addition, even after the power supply to the winding motor is stopped, the chain winding motor actually runs idly, and the film 12 runs idly accordingly, so the signal contact piece 26 is connected to the edge part of the pattern 27a (when rotating in the X direction). initial position)
It rotates from the position shown in FIG. 5(a) and stops. The position of 5TP2 in FIG. 5(C) corresponds to this. Further, the simultaneous on period of the outputs P1 and P2 at each STP position is sufficiently longer than the on/off period in area A of the pattern 27a.

Thereafter, when the release is performed with the signal contact piece 26 located at the 5TP2, the next frame is photographed, and following the completion of the photographing, winding of the frame is started, and the signal board 27 and the signal contact piece are Winding control similar to that described above is performed by the camera control circuit 106 based on the film position signal generated by the camera 26.

FIG. 5(b) shows the state shown in FIG. 5(C) corresponding to the actual film position. Since the film 12 stops at the STl"2 position, the interval between 5TPI and 5TP2 is 1 during shooting. One frame (38mm for 35mm film)
) is determined. When a photograph is taken at this position, the area within the frame is exposed to light, and the subject is captured as a latent image. In the figure, Ll indicates the distance from the center of the photographic screen (frame D) to the LED array 14, which is a light source for data imprinting, and L2 + L3 indicates the desired distance from the center of the photographic screen (frame D) to the data imprinting on the film surface. (In this embodiment, a maximum of 30 digits of data can be imprinted.) This is the distance indicating the position (details are given using FIG. 5 during the data imprinting operation).

The control circuit 106 of the camera performs winding control (
At the same time, the shooting information such as shutter speed, aperture value, ISO value, and exposure compensation value for each release and the film position signal (the outputs P1 and P2) are stored in the data imprinting device 2. Serial communication is being carried out to the microcomputer 100 of
0 is supplied with a basic clock from the crystal oscillator lO1, the address is initialized by a reset circuit (not shown), and R
Processing of the data is started according to the contents of the OM 100c.

Here, before going into a detailed explanation of the operation on the data imprinting device 2 side, we will explain the external expansion device that stores the shooting information sent from the camera every time the camera is released and the imprinting data set by the operation member 102. The configuration and storage method in the RAM 105 will be described with reference to FIG.

As shown in FIG. 6, the storage area is divided into an imprint data storage area and a shooting information storage area. (characters/sheet), that is, a capacity for 1080 characters is secured.

When a release is performed for a certain frame while the film 12 is loaded, each piece of information at that time is stored in the imprint data storage area and the photographic information storage area. However, if the setting is not to store data, a blank code is stored in the imprint data storage area and the pointer is advanced to the storage area of the next frame. Also, nothing is stored in the shooting information storage area, and the pointer does not advance.In other words, the shooting information to be stored is stored in the shooting information storage area in the order in which it was sent. At the time, the data to be imprinted on the final photographed frame is read out sequentially from the stored data, for example, in the case of a 36-shot film, the data stored in the imprint storage area for the 36th frame.

Note that whether or not to perform data imprinting on the released frame is stored in the RAM 100b. The flag to be set is determined to be "l" or "O" depending on whether or not the on/off key 10 is operated. Further, the photographing information stored in the photographing information storage area is data for later checking under what conditions (shaft speed, aperture value, etc.) each frame was photographed.

Next, the operation on the data imprinting device 2 side will be explained using FIG.

[Step 1] Data sent from the camera side is received. This initial communication content represents the state of the camera, that is, the release state or the rewind state.

[Step 2] It is determined whether the camera is in the released state or not. If the camera is in the released state, the process proceeds to step 3; otherwise, the process proceeds to step 12.

[Step 3] Receive shooting information data i such as shutter speed, aperture value, ISO value, and exposure compensation value for the released frame, and transmit the information to the display drive circuit 1.
03 to be displayed on the LCD 3.

[Step 41 It is determined whether or not the film 12 is loaded in the camera. If the film 12 is not loaded, no shooting information or imprint data is stored.
If it is loaded, proceed to step 5.

[Step 5] Check whether the flag for photographing information storage is set to "l" by the operation member 102 (the key for setting the flag is not shown in FIG. 2(a)) or not.
Judging from the information in 100b, if the flag "1" is set, the process proceeds to step 6, and if it is not set, the process proceeds to step 9.

[Step 6] Determine whether or not there is space left in the shooting information storage area where new shooting information can be stored. If there is no storage area left, proceed to step 9; if there is, proceed to step 9. Proceed to Stella 7.

[Step 7] The photographing information at that time is stored in the pointer indicating the storage position of the photographing information storage area in the externally added RAM 105.

[Step 8] Upon completion of storage, advance the storage pointer.

[Step 9] Check whether or not the imprint data storage flag is set to "1" by the operation member 102 (the key for setting the flag is not shown in FIG. 2(a)) from the RAM 100b. If the flag is set to ``1'', the process proceeds to the stage 2O, and if it is not set, the process proceeds to step 11.

[Step 2 Step 10] Before photographing, while viewing the display on the LCD 3, the imprint data etc. set by operating the operating member 102 are stored in the imprint data storage area corresponding to the frame.

[Step Ill Upon completion of storage, advance the storage pointer.

With the above steps, the processing at the time of release ends.

On the other hand, if it is determined in step 2 that the camera is not in the release state, the process proceeds to step 12 as described above.

[Step 12] Determine whether the camera is in the rewind state, and if it is in the rewind state, proceed to step 1.
Proceed to step 3.

[Step 13] Film 12 has ended!
Before the blue display (i.e., rewinding data imprinting operation) is started, a display (not shown) prompting confirmation as to whether or not the data to be imprinted needs to be corrected is displayed, and rewinding is prohibited. A turn-on signal of the switching transistor 108 is outputted to the switching transistor 108 for this purpose (here, the discussion is based on the assumption that the imprint data is stored in the external expansion RAM 105).

[Step 14] Data is corrected according to the input from the operating member 102.

[Step 15] The switching transistor 10
It is determined whether the off signal No. 8 is being output, that is, whether the rewind key 11 is on or off. If it is off, the process returns to step 14, and if it is on, the process proceeds to step 16.

[Step 181: Output an off signal for the switching transistor 108 to release the rewind prohibition.

Here, a detailed explanation of the operations from step 12 to step 16 on the camera side and within the data imprinting device 2 will be given with reference to FIG. Since it is not directly related to this, it will be omitted here.

If the frame photographed when the signal contact 26 is located at 5TP2 (area C) in FIG. becomes. As described above, this state is determined by the control circuit 106 of the camera when the on/off signal of the output P1 is no longer repeatedly generated even during the winding operation (its period T is longer than a certain period of time). As a result, the power supply to the winding motor (not shown) is stopped, and data indicating that the camera is in the rewinding state is transmitted to the data imprinting device 2 side.

On the other hand, when the above-mentioned data is sent from the camera side, the microcomputer 100 causes the LCD 3 capable of displaying 30 characters to display a warning (not shown) via the display drive circuit 103, and prompts the photographer to Checking the imprint data content (
At the same time, since the imprinted data has been stored in the external expansion RAM 105, a high level signal is output to the switching transistor 108 via l10100h, and the switching The transistor 108 is turned on. Therefore, even if a high level signal is output from the camera control circuit 106 to the switching transistor 107 in order to shift to the rewinding operation due to film tension detection, the switching transistor 108 is in an on state.

The switching transistor 107 is not turned on (that is, rewinding is prohibited), and the rewinding motor 19 does not immediately (automatically) rewind the film 12. If not (
If no imprint data is stored in the external additional RAM 105 as described above, the switching transistor 108 remains off, so that the rewinding and accompanying imprinting operation, which will be described later, are immediately started.

The subsequent data correction in step 14 will not be described in detail here, as described above.

Next, when the photographer presses the rewind key 11 to start rewinding, the output from the l10100h in the microcomputer 100 shown in FIG. is turned off. This means that the state of prohibition of rewinding is released. Therefore, the switching transistor 107 is turned on, energization to the rewind motor 19 is started, and the motor 19 begins to rotate in the rewind direction.

Returning to the explanation of the flowchart in FIG. 7 again, step 1
The operations from 7 onwards will be explained.The operations for each step will be briefly explained, and then the series of them will be explained in detail as described above.

[Step 17] Data sent from the camera side is received.

[Step 18] It is determined whether or not an imprinting operation start signal has been sent in step 17, and upon detecting that the imprinting operation start signal has been sent, the process proceeds to step 19.

[Step 19] Receive data sent from the camera side again, such as a rewinding end signal, a single character imprinting start signal, or a discard pulse signal corresponding to a period in which imprinting is not performed (i.e. imprinting timing signal). conduct.

[Step 20] It is determined whether or not a rewinding end signal has been sent. If it is detected that it has been sent, the process proceeds to step 25; otherwise, the process proceeds to step 21.

[Step 21] It is determined whether or not a single character imprinting start signal has been sent. If it is detected, the process proceeds to step 22; otherwise, the process returns to step 17.

[Step 22] It is determined whether or not a discard pulse signal has been sent. If it is detected that it has been sent, the process returns to step 19; otherwise, the process proceeds to step 23.

[Step 23] Imprinting one character in response to the one character imprinting start signal detected in step 21,
Upon completion, the process proceeds to step 24. Therefore, in this embodiment,
This operation will be performed up to 30 times in one frame.

[Step 24] Each time the imprinting of one character of data for one frame is completed, step A shown in FIG.

The imprint data storage pointers indicated by B, C, . . . are decremented by 1, and the process returns to step 19. Also,
When all the characters have been imprinted on frame l, the storage pointer of the imprint data storage area indicated by the arrow in FIG. 6 is decremented by 1, and the process returns to step 19.

[Step 25] Set the imprint data storage pointer to the initial position.

This completes the series of operations, but a detailed explanation of the operations from step 17 to step 24 on the camera side and within the data imprinting device 2 will now be given with reference to Fig. 4.5. .

The film tension mentioned above is the signal board 27 in FIG. 5(a).
It is uncertain where on the top it occurs. In other words, in this embodiment, the imprint data is stored in the external additional RAM 105 when five photographs are taken, and the information (or the information corrected before rewinding the film) is stored on the film. Since the method uses a method to flash the LED array 14 for imprinting while reading the film during rewinding, if the imprint data and the actual shooting frame are not compatible with l:1 even when rewinding the film, it may cause problems during shooting. This may cause a serious problem such as information different from the original frame being recorded (for example, information shifted by l frames). Therefore, when rewinding the film after stretching, it is necessary to It is impossible to reliably detect (to cue) that the image passes through the LED array 14 and to imprint the imprint data of the final photographed frame by blinking the LED array 14.

As mentioned above, film tension positions can occur in all areas A-C on the signal board 27. Therefore, in this embodiment, after the rewinding of the last photographed frame is started (the signal contact piece 26 begins to rotate in the direction of the arrow Y in FIG. 5(a)), the outputs p1 and p2 are turned on at the same time. What happened (Part 5)
This can be achieved by detecting the passing of the area C in FIGS. (a) and (c), and then starting the imprinting operation on the final photographed frame. Even after the outputs Pl and P2 output the ON signal simultaneously, the signal board 27 continues to output one pulse (output P1) for each pitch angle α.
In this embodiment, one digit of imprint data (one
(During this time, the LED array 14 blinks five times and is printed).

Here, for each pulse of output P1 that is continuously output, "1
” to “43” (see Fig. 5(c)), the desired imprinting leading distance L2 (see Fig. 5(b))
In order to obtain this, the LED array 14 is controlled so that it does not blink during the 1st to 9th pulses (in other words, the 1st to 9th pulses are discarded pulses), and up to 30 digits are imprinted within the subsequent distance L3. Therefore, the LED array 14 is blinked according to the 1st to 39th pulses to form 30 characters on the surface of the final photographed frame, and the LED array 14 is blinked again in the following 40th to 43rd pulses.
4 is controlled so that it does not blink.

As the unwinding pitch angle α further advances, the output P l
The data of the simultaneous ON signal of +P2 is sent from the camera side, and based on the data of output P, which is output in the same way, the data is imprinted on the next shooting frame, and from then on, the data is transferred to the next shooting frame. Based on the next film position signal, the data imprinting device 2 performs similar operations until imprinting on the first photographed frame is completed.

Next, how to set the blinking timing of the LED array 14 will be explained.

During rewinding, the speed of the film 12 fluctuates, and as a result, there is a risk that the width of the imprinted characters displayed in a dot matrix and the pitch between dots may become uneven.To prevent this, needs to absorb this variation. Figures 5(d) and (e).

Cf) will explain this point.

FIG. 5(d) is an enlarged display of the 9th to 11th pulses in FIG. 5(C) with the horizontal axis as the time axis.

Each period is T9. Let TIO, Tll. The LED array 14 is made up of seven LEDs arranged vertically, and has a size of 5×
In order to form a character with the dot matrix of 7, the output P
It is necessary to turn on the light 5 times during one pulse of 1. Also, since a suitable margin is required between adjacent characters, one pulse of the output P is divided into 7 parts, a character is formed with 577 of the l pulse, and a margin is formed with the remaining 2/7. ing. Also the fifth
FIG. 5(e) shows the lighting pulses of the LED array 14, and FIG. 5(f) shows the 5×7 dot matrix characters obtained thereby.

L E I+7 Ray 14 output P! II I Q
It is controlled to start blinking from the pulse, and the blinking period is determined by the ninth pulse. That is, the blinking period is T9/7, and the lighting time of the LED array 14 is set to T9/14 or less. This reduces the amount of film movement during lighting to less than 1/2 of the distance between adjacent dots.

This is a necessary condition for obtaining resolution between dots and maintaining the quality of imprinted characters. Similarly, the blinking cycle of the LED 7 ray 14 at the 11th pulse of the output P8 is T10/7. The 12th pulse is Tll/7.

In this way, the output P1 for one character (l pitch) (which is sufficiently small compared to the film feed amount for one frame)
The distance between the imprinted characters and dots, that is, the LED
Since it is configured to determine the flashing cycle of the array 14,
Even if there is a change in film speed during rewinding, it can be adequately coped with, and irregularities in character width and distance between dots can be eliminated.

According to this embodiment, the simultaneous ON signals of outputs P 1 and P 2 are generated for the first time after rewinding is started (Fig. 5 (C
Since the configuration is such that imprinting is prohibited up to area C), it is possible to reliably imprint data corresponding to the final photographed frame on the film. Further, since the imprinting is performed after confirming the generation of simultaneous ON signals of the outputs P1eP2 for each frame, not just the final photographed frame, it is possible to perform good imprinting for all photographed frames. Note that the output P 1 + is only for the final photographed frame.
If the configuration is such that imprinting is performed after confirming that the P2 simultaneous ON signal is generated, frames other than the last photographed frame will be imprinted after a predetermined time (the time required to rewind one frame) or after a predetermined length. If the imprinting is performed after the film has been rewound by the length of 1 frame), it is possible to perform good imprinting for all frames.

(Correspondence between Invention and Embodiment) In the embodiment of FIG. 4, the LED array 14 and the light emitting drive circuit 104 serve as the data imprinting means of the present invention, the externally added RAM 105 serves as the storage means, the CPU 100a serves as the control means, and the fourth The part that makes the determination in step 18 corresponds to the chest top position detection means, and the part that does not allow the sequence to proceed to step 19 if "NO" in step 18 corresponds to the imprint prohibition means.

(Effects of the Invention) As explained above, according to the present invention, there is provided a chest leading position detecting means for detecting the leading position of the last photographed frame based on a position signal indicating a change in film position that occurs when film rewinding is started; An imprinting prohibiting means is provided which prevents the control means from instructing the imprinting means to imprint data until the leading position of the final photographed frame is detected by the chest leading position detecting means, and thereby the film can be rewound. Rather than imprinting the data at the same time as the start, the data imprinting operation is performed only after the starting position of the final photographed frame has been detected to ensure accuracy in the correspondence between the final photographed frame and the data imprinted there. , I made sure that the correspondence between each frame and the data after that would be naturally accurate, so that the final photographed frame would not be imprinted with data that should have been imprinted on other photographed frames.
It is possible to reliably match the imprinting positions of each data corresponding to each photographed frame.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a perspective view showing a camera equipped with the device shown in FIG. 1, and FIG.
4 is a block diagram embodying an embodiment of the present invention, FIG. 5 is a diagram for explaining the data imprinting process, and FIG. 6 is a diagram showing the mechanical configuration of the main parts. 4 is a diagram illustrating the inside of the externally added RAM shown in FIG. 4, and FIG. 7 is a flowchart illustrating an embodiment of the present invention. 1...Camera body, 2...Data imprinting device, 3...LCD, 4-11...
・Key, 12... Film, 14...
LED array, 20... Rewind motor, 26.
...Signal contact piece, 27...Signal board, 10
0...Microcomputer, 104...
...Display drive circuit, 105...External expansion RAM
, 106... Camera control circuit, 107, 10
8...Switching transistor, 201...
...Film position detection means, 202...
Control means, 203... Chest top position detection means, 2
04...Data imprinting prohibition means, 205...
...Storage means, 206...Data imprinting means, Pl, Pl...Output, T...
Period, Ll-L3... distance. Patent applicant Canon Co., Ltd. Agent Minoru Nakamura Figure 1 Figure 2 (b) - Figure 3 (a) Figure 3 (b)

Claims (1)

[Claims] (1) data imprinting means for imprinting data onto the film surface; storage means for storing the data; and during film rewinding, the data of each frame is sequentially read from the storage means, and the data is transferred to the imprinting means. In the data imprinting device, the data imprinting device includes a control means for imprinting on each frame, and a frame start position detection means for detecting the start position of the last photographed frame based on a position signal indicating a change in the position of the film that occurs at the start of film rewinding; The camera is characterized by further comprising an imprinting prohibiting means for preventing the control means from instructing the imprinting means to imprint data until the leading position of the final photographed frame is detected by the frame leading position detecting means. Data imprinting device.