JPH06160950A - Prewinding type camera - Google Patents

Abstract

PURPOSE:To make efficient and sure photographing of many sheets possible on currently available films. CONSTITUTION:The prewinding type camera which controls the film feed by detecting the pulses of an interlock switch 11 connected to a sprocket 10 by a pulse detecting part 13 is controlled in such a manner that the return quantity of the films coincides by counting the pulses by a count system at the time of rising when the detected pulses at the time of prewinding is in a high state and by counting the pulses by a counting system at the time of a falling when the above-mentioned pulses are in a low state. This camera is applied to a camera of a DIL system for automatically drawing the film out of a cartridge loaded in the camera and winding this film to a winding part. As a result, at least two sheets of additional photographing is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the control of film feeding in a prewind type camera.

[0002]

2. Description of the Related Art Conventionally, a prewind type camera in which all the film is wound in advance when the film is loaded is well known.
According to this camera, in the case of, for example, a film of 36 shots, the number of films subtracted from 36 sheets in each shooting is often displayed on the display unit. Therefore, there is an advantage that the photographer can easily grasp the remaining number of films.

[0003]

By the way, in general, the length of the film is made to have a margin larger than a predetermined number of sheets, and in some cases, it is possible to shoot more than the predetermined number of sheets. Even in the above prewind type camera, there are cases where more than a predetermined number of images can be taken, although it depends on the loading condition of the film.

However, in the prewind type camera, the margin amount is slightly short of the length of one film, and the additional photographing is often impossible. That is, as shown in FIG. 9, in the film 2 pulled out from the cartridge 1, it is necessary to separate it from the cartridge 1 at the time of development and connect it to another film or label it. Imaging cannot be performed in the areas A and B indicated by the diagonal lines. Further, the C area is a portion that may be pulled out when the film 2 is set in the camera, and the camera is controlled so as not to photograph in the C area in order to ensure safety. And
When 36 pictures are taken with such a film 2 of 36 pictures, it becomes as shown in the figure, and since there is a margin in the film length, it will be a little extra, but since the 37th picture is taken. Often, it was not possible to secure one frame.

Therefore, the present applicant has decided to pay attention to the fact that the control of the area A necessary for the development process is uneven. That is, the film feeding control is performed by detecting a pulse from a switch interlocked with the rotation of the sprocket, and the area A is set by reversing a predetermined amount from the completely wound state. An example of this reversion control is shown in FIG. 10. When the detection pulse is in the “High” state when the film 2 is completely wound up, as shown in FIG. The film 2 is reversed until the rising of the eye, but when the detection pulse is in the "Low" state, the film 2 is reversed until the rising of the fifth pulse. This is because the return amount becomes smaller than the minimum required amount when the control is performed with 4 pulses at the time of Low as in the case of High.

For this reason, at the time of Low, on the contrary, the length is increased by half a pulse (4.75 mm). For example, when controlling one frame for photographing with 4 pulses, the maximum is 9 pulses. A variation of 0.5 mm will occur. Therefore, conventionally, there is a problem in that the additional filming is hindered by the variation in the film return amount. This is also the case with other films such as 12 shots, 24 shots, and 20 shots, and even in this case, additional value could not be provided.

Further, in the area C of FIG. 9, it is expected that the film 2 can be pulled out when the film is loaded.
The area C is also controlled so that it cannot be photographed although it may be a photographable area. That is, in the camera, a simple loading type (for example, DIL [trademark] -Drop in) in which the film 2 is automatically pulled out from the cartridge loaded without pulling out the film 2 and wound around the winding section
There is a camera of loading type), and in this case, the area C remains unexposed and is wastefully discarded.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a prewind type camera capable of efficiently and reliably taking a large number of images on a current film. is there.

[0009]

In order to achieve the above object, the invention according to the first aspect has a control means for detecting a pulse output at the time of film feeding and controlling the film feeding amount, In the prewind type camera in which the film is wound up to the rear end portion by this control means and then returned by a predetermined amount, and the film is set to the photographing position of the first sheet, the control means is a detection pulse when the film is wound up to the rear end portion. When the film is in the high state, select either the rising count or the falling count in the pulse detection.If the detection pulse during film winding is in the low state, select a counting method different from that in the high state. The film is controlled so that the returning amounts of the films are the same. The invention described in the second aspect is characterized in that the invention is applied to a camera having a structure in which a film is automatically pulled out from a cartridge loaded in the camera and wound around a winding portion. Furthermore, the invention according to the third aspect is characterized in that the invention is applied to a camera having a self-continuous shooting function and executes self-continuous shooting including an additional frame.

[0010]

According to the above construction, for example, when the detection pulse at the end of film winding is High, the film return amount is controlled by the pulse processed at the rising edge count.
When it is Low, the amount of film return is controlled by the pulse processed by the falling count. As a result, the film will not be returned more than necessary, and additional photography can be efficiently performed with the film currently used.

Further, if the above configuration is applied to the simple loading type in which the film is automatically wound around the winding portion from the cartridge loaded in the camera, the area set as the film withdrawal can be utilized for photographing. Therefore, there is an advantage that the additional number of images can be increased and the additional image capturing can be surely performed.

Further, for the self-continuous shooting, additional frames can be used. With this, the range of the self-continuous shooting is widened and the usability is further enhanced.

[0013]

1 is a control block diagram of a prewind type camera according to an embodiment, in which an interlock switch 11 is connected to a sprocket 10, and the interlock switch 11 interlocks with the rotation of the sprocket 10. And output a pulse. The sprocket 10 and the interlock switch 11 of the embodiment are configured to output four pulses for one frame (frame) of the film 2 (FIG. 3). The interlocking switch 11 is connected to the CPU 12 (central processing unit), the pulse output from the interlocking switch 11 is input to the pulse detecting unit 13, and the CPU 12 is provided with a counter unit 14 and a control processing unit 15. To be

The CPU 12 has a rewritable EE.
PROM (Electrically erasable / programable read-o
nly memory) 16 is connected to this EEPROM
In 16 is stored information and the like for performing additional photographing. Since there are various kinds of general-purpose films in general, in the embodiment, the film 2 which enables the above-mentioned additional photographing is automatically selected to ensure the certainty of execution. That is, the 35 mm film 2 also has various types such as 10 shots, 12 shots, 20 shots, 24 shots, and 36 shots, and these information can be obtained from the DX code attached to the cartridge. Therefore, the control processing unit 15
The control processing unit 15 determines whether or not an additional photographing operation is performed based on the DX code information input to the EEPROM 16 and the information of the EEPROM 16. In the case of the current 35 mm film 2, most types are added. Shooting is possible.

The CPU 12 is also connected to a display unit 17 formed of a liquid crystal display, and the display unit 17 displays the remaining number of films. In the embodiment, if it is assumed that two extra images can be taken on the 36-exposure film 2, instead of starting from the display of "38", the operation starts from "36", and the last two images are, for example, "P1", " A display such as P2 "is displayed.

Further, in the control processing section 15, the pulse counting operation shown in FIG. 2 is switched when the film is fed to the first photographing position. That is,
When the film 2 is prewound (preliminary winding), the counting method is changed according to the state of the pulse from the interlocking switch 11 detected by the pulse detector 13. Figure 2 (A)
As described above, when the film 2 is stopped in the high pulse state, the pulse is counted at the rising edge of the pulse in the next film returning operation, and in the embodiment, 4
The film feed is stopped at the pulse. On the other hand, FIG.
As shown in (B), film 2 with a low pulse
If is stopped, the number of pulses is counted at the trailing edge of the pulse in the next film returning operation, and the film feeding is similarly stopped at the fourth pulse. Therefore, as is clear from the figure, the film feed amount is the same whether the film 2 is stopped in the High state or stopped in the Low state. This allows
Comparing the case of the conventional 35 mm film 2, at least 4.75 mm and a maximum of 9.5 mm are secured, and therefore one perforation can always be used as a photographing area.

FIG. 3 shows the arrangement of photographed frames in the embodiment. According to the above control, the conventional area A (FIG. 9) becomes the area A1 as shown in FIG.
The frame of the first frame moves out of the area C which may be exposed when the film is loaded, and the 37th frame, that is, the additional frame of P1 can be reliably captured.

Further, in the embodiment, an additional photographing area is secured even at the leading end of the film 2. That is, a DIL-Drop in load type camera is used in which the cartridge 1 taken out from the film package is directly loaded into the camera and the film 2 is automatically wound around the winding portion. According to this, since the C area is loaded in the camera in an unexposed state, as shown in FIG.
The 38th image (P2) can be taken, and in addition, a margin in the D area can be left.

The embodiment is constructed as described above, and its control operation will be described with reference to the flow charts of FIGS. First, in step 101 of FIG. 4, the Patrone 1 is loaded into the Dill type camera without pulling out the film 2.
When the back lid is closed, prewinding (preliminary winding) is automatically performed, and the process proceeds to step 102. In this step 102, it is determined whether or not additional photographing is performed depending on the type of film read from the DX code of the Patrone 1 (it plays the role of eliminating the special film), and "N (NO)" is determined. When this is the case, N = 13, which is the number of controls for securing the B area and C area, is set (step 103), and when "Y (YES)", N = 7 is set to secure the B area. To do. This set of N numbers is
Since the number of films that can be photographed is detected during the prewind, the process is performed to remove the areas B and C from the film number count.

Next, in the case of performing the above additional photographing, the process proceeds to step 105, in which the motor is turned on in the prewind direction, and in the next step 106, the pulse from the interlocking switch 11 connected to the sprocket 10 is applied. At the same time as the detection by the pulse detection unit 13, the counter unit 14 counts the number of pulses. This counting is performed by detecting the rising edge of the pulse.

In the next step 107, it is judged whether or not the pulse count has become N (7 or 13). If "N", then a predetermined time is waited in step 108, Then stop the motor (step 1
09). On the other hand, in the case of "Y", after the pulse count is reset in step 110, the film count-up is started (step 111). Step 112
Then, continue pulse detection and counting, and step 11
In 3, it is detected whether or not the pulse count reaches 4,
If “Y” here, step 110 to step 11
By repeating the steps up to 3, the film count is sequentially performed. As a result, the number of films that can be shot is always confirmed even when additional shooting is performed. For example, in the case of 36-shot film, 39 or 3 films are taken.
Eight pieces are counted. Then, the above step 113
In step 114, when it is detected that the predetermined time has passed, the motor is temporarily stopped,
Shift to the operation of.

In step 201 of FIG. 5, the motor is turned on in the film feed direction, which is the reverse direction of the film, and at the same time the pulse count is reset (step 202), after which pulse detection and counting are performed (step 203). ). In the next step 204, it is determined whether or not the pulse count has reached 4, and if "Y", the motor is stopped (step 206). That is,
About one frame corresponding to the area A1 in FIG. 3 is sent and set at the first photographing position. Here, as shown in FIG. 2, when the motor is stopped in step 115, The control method switches depending on the pulse state.
In the embodiment, as described above, when the pulse starts from the high state, the rising counting method is used, and when the pulse starts from the low state, the falling counting method is used, and the film feed amount is always uniform. Controlled as.

In the next step 207, it is judged whether or not there is additional photographing, and if "N" here, the film countdown is started from the numeral 36 as usual (step 208). On the other hand, if "Y", the film count and the P count are set in step 209, and this operation is shown in FIG.

In FIG. 6, when the film count and P count setting are started (step 301), it is determined in step 302 whether or not film count ≧ 39. If “Y”, 36 pictures are taken. Since it is a film, the film count is set to 36, and the P count for additional photographing is set to 2 (step 303). Therefore, in this case, the leading edge of the film (after the last frame)
There will be a margin of more than one frame left. In step 304, it is determined whether or not the film count = 38. If "Y", the film count is set to 36 and P
The count is set to 1 (step 305).

Next, at step 306, it is judged if the film count = 27 or not, and if "Y", then 24.
Since the film is a single-shot film, the film count is set to 24, the P count for additional shooting is set to 2 (step 307), and the process proceeds to the next step 308. In this step 308, it is determined whether or not the film count = 26, and when "Y", the film count is set to 2
4, the P count is set to 1 (step 309), and when it is "N", the count down is continued and the P count is set to 0. It should be noted that, even when "N" is obtained in step 304, the process proceeds to step 310. In this way, the number of P counts is set in advance before shifting to the shooting operation, and after that, the count at the time of shooting in FIG. 7 is performed. In the flowchart of FIG. 6, the operation is performed only for the 36-shot and 24-shot films, but in reality, the 20-shot and 12-shot films are also determined. This is accomplished by adding a similar decision routine after step 309.

In FIG. 7, when the photographic frame feed is executed (step 401), the motor is turned on in the photographic frame feed direction in step 402, and the pulse count is reset in the next step 403. Then, when the pulse detection and counting are performed in step 404, it is determined in step 405 whether or not the pulse count for one frame = 4, where "N" is determined, and in step 406. When the predetermined time has elapsed, the motor is stopped. On the other hand, in step 405, "
If "Y", it is determined in step 408 whether or not the film count is .gtoreq.2. If "Y", it means that one frame is normally shot, and therefore step 409 is performed. Counts down and the motor is stopped.

If "N" in step 408, the process proceeds to step 410, in which it is determined whether or not the film count = 1, and when "Y", the film countdown is performed. (Step 41
1), if "N", P countdown is performed in step 412, and the operation proceeds to the operation of FIG.

In step 501 of FIG. 8, P count ≧
It is determined whether or not it is 1. If "Y", it is determined in step 502 whether or not P count = 1, and if "Y", "P1" is displayed on the display unit 17. (Step 503), and if “N”, “P2” is displayed on the display unit 17.
Is displayed (step 504), and then the motor is stopped (step 505). That is, in the embodiment, in order to make it clear that the shooting is an additional shooting other than the number of displayed Patrone, specific notations such as P1 and P2 are displayed on the display unit 17.

Further, in the above step 501, "N"
If it is, "0" is displayed on the display unit 17 (step 50).
6), the process proceeds to step 507. This step 507
Then, it is determined whether or not a pulse is detected, and if "Y", the timer count is reset (step 50).
8). On the other hand, if "N", it is determined in step 509 whether or not the time is over, and if "Y", "E (end)" is displayed on the display unit 17 (step 5).
10), the motor is stopped (step 51).
1).

As described above, in the embodiment, it is possible to take at least two additional images, and it is possible to clearly determine that the additional images are taken. This additional shooting is not limited to two, but depending on the type of film, two or more additional shootings are possible. As described above, this counts in advance the number of frames that can be shot during prewind. This makes it easier to achieve. Further, in the above embodiment, the additional shooting of two images is ensured by using the camera of the dill system, but of course, it may be applied to a camera other than the dill system, and in this case, at least one additional shooting is performed. Is possible.

Further, in the above embodiment, the EEPRO of FIG.
Information for performing additional shooting is stored in the M16. By using this EEPROM 16, it is possible to program such that additional shooting according to the present invention and normal shooting can be switched. . According to this, there is an advantage that the specifications of each country in the world can be met.

Furthermore, although the embodiment has a self continuous shooting function, this self continuous shooting function is adapted to execute self continuous shooting including additional shooting frames P1 and P2. . That is, conventionally, three continuous shots are displayed when the display is "3" or more, and two continuous shots are performed when the display is "2" or more, but in the present invention, the three continuous shots are displayed when "1" or more. When,
The two-shot shooting is controlled to be executed when the specific notation of "P1" is exceeded. According to this, the opportunity for continuous shooting is increased twice as compared with the conventional case, and it is possible to obtain a camera with good usability.

[0033]

As described above, according to the invention of the first aspect, the prewind type camera having the control means for detecting the output pulse at the time of feeding the film and controlling the film feed amount is the above-mentioned control means. If the detection pulse during film winding to the rear end is high, select either rising count or falling count in pulse detection, and the detection pulse during film winding is low. In this case, a counting method different from that in the high state is selected and the return amount of the film is controlled to be the same, so that it is possible to use an area less than one frame which was conventionally discarded for additional shooting. , It will be possible to shoot a large number of images with the current film.

According to the second aspect of the present invention, since the invention is applied to the DIL type camera in which the film is automatically wound around the winding portion from the cartridge loaded in the camera, the exposure is conventionally performed when the film is set. Thus, the discarded area can be used for shooting, and it is possible to efficiently and surely shoot a large number of sheets in the current film.

Further, according to the invention of the third aspect, the invention is applied to a camera having a self-continuous shooting function, and the self-continuous shooting is executed including additional photographed frames. It is possible to obtain an easy-to-use camera.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a prewind type camera according to an embodiment of the present invention.

FIG. 2 is a waveform diagram showing a state of pulse detection and counting in the example.

FIG. 3 is an explanatory diagram showing an arrangement state of film frame frames in the embodiment.

FIG. 4 is a flowchart showing an operation during prewinding in the embodiment.

5 is a flowchart showing a continuation of the operation of FIG.

FIG. 6 is a flowchart showing a film count and P count setting operation in the embodiment.

FIG. 7 is a flowchart showing a shooting frame advancing operation after prewinding in the embodiment.

FIG. 8 is a flowchart showing a continuation of the operation of FIG.

FIG. 9 is an explanatory view showing a conventional arrangement state of filmed frames.

FIG. 10 is a waveform diagram showing a state of pulse detection and counting in a conventional camera.

[Explanation of symbols]

 1 ... Patrone, 2 ... Film, 11 ... Interlocking switch, 12 ... CPU, 13 ... Pulse detection section, 14 ... Counter section, 16 ... EEPROM, 17 ... Display section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiro Omura 3-1345 Izumi, Asaka City, Saitama Prefecture Fuji Shashin Film Co., Ltd. Asaka Technology Development Center

Claims (3)

[Claims] 1. A control means for controlling a film feed amount by detecting a pulse output at the time of feeding a film, by which the film is wound up to a rear end portion and then returned by a predetermined amount, and a first sheet is fed. In the pre-wind type camera for setting the film at the photographing position, the control means, when the detection pulse at the time of film winding to the rear end is in the high state, either the rising count or the falling count is detected in the pulse detection. One of them is selected, and when the detection pulse at the time of film winding is in the low state, a counting method different from that in the case of the high state is selected, and the prewind type camera is controlled so that the returning amount of the film is matched. . 2. The prewind type camera according to claim 1, wherein the prewind camera is applied to a camera having a structure in which a film is automatically drawn out from a cartridge loaded in the camera and wound around a winding section. 3. The prewind type camera according to claim 1 or 2, wherein the prewind type camera is applied to a camera having a self-continuous shooting function and executes self-continuous shooting including an additional frame. .