JPH0244326A - Film feeding malfunction detector - Google Patents

Abstract

PURPOSE:To perfectly prevent the failure of photographing because a film is not fed and to improve the reliability of photographing by detecting the film is really fed or not, and carrying out either or both of displaying feeding malfunction or/and setting the impossible condition of exposure at the time of occurring feeding malfunction. CONSTITUTION:When the feeding of the film is not detected by a feed detecting means 18 in condition where the loading of the film is detected by a load detecting means 14 at the time of feeding the film by a film feeding means 32, a provided controlling means 10 carries out either or both of setting the impossible condition of future exposing action by an exposing means 28 or/and displaying feeding malfunction by a display means 36. Thus, without the film fed after it is loaded, photographing never occurs and multiphotographing is never carried out contrary to one's wishes. Besides, reliability at the time of photographing by the camera improves.

Description

TECHNICAL FIELD The present invention relates to a film feeding abnormality detection device for detecting film feeding abnormality in a camera.

``Prior art and its problems'' Modern cameras are equipped with film loading, winding,
An increasing number of vehicles are equipped with auto-loading and auto-winding devices that automatically perform rewinding using a motor.

When loading film into a camera of this type, open the back cover of the camera, set the cartridge, pull the film out of the cartridge, place the leading edge of the film on the sprawl, and align the perforations with the teeth of the sprocket. All you have to do is close the back cover, and when the back cover is closed, the film is automatically advanced by a predetermined number of frames (usually 4 frames), so-called loading and cueing are completed, and the camera is ready for shooting.

Furthermore, when the release button is pressed and shooting (exposure of the film) is completed, the film is automatically wound up one sheet (AE) and ready for the next shooting.

However, in such conventional cameras, even if the user closes the back cover after loading film without properly engaging the perforations with the sprocket, it is difficult to determine whether the film is actually being fed. The winding process for a predetermined number of sheets is performed regardless of the number of sheets.

In addition, even during shooting, if for some reason the perforation comes off the sprocket or breaks, the film may be processed for image processing or winding, regardless of whether the film is actually being fed or not. Processing was about to take place.

Therefore, if the film is not being fed from the time it is loaded, as in the former case, the user may take pictures without knowing this, and as a result, not even a single photo can be taken. There was a situation where there was no such thing.

Furthermore, in the latter case, where the film is not fed during the shooting of the machine, the user may continue shooting the machine without knowing this, resulting in unintended multiple shots. There was something that happened.

``Object of the Invention'' The present invention was made in order to solve the above-mentioned conventional problems, and detects whether or not film is actually fed, thereby improving the reliability of the camera. An object of the present invention is to provide a film feeding abnormality detection device as described above.

"Summary of the Invention" The present invention detects whether or not the film is actually fed, and includes: a film feeding means for feeding the film; and a film feeding means for feeding the film; loading detection means for detecting the feeding of the film; exposure means for exposing the film; display means for displaying the feeding status of the film; When the film is fed by the feeding means, if the feeding of the film is not detected by the feeding detection plate under the condition where the loading of the film is detected by the loading detection means, the exposure is stopped. The apparatus is characterized by comprising a control means for disabling subsequent exposure operations by the means, or displaying a feeding abnormality by the display means, or both.

This prevents the film from being taken without being fed at all after loading the film, and prevents unintended multiple shots from being taken.

"Embodiments of the Invention" An embodiment of the present invention will be described below in detail based on the drawings.

FIG. 1 is a schematic diagram of a film feeding abnormality detection device according to the present invention.

The control unit IO as a control means has a DX contact 14 as a loading detection means that turns on based on information such as film sensitivity (ISO+) attached to the surface of the cartridge when a cartridge is loaded in the camera. This DX contact 14 allows the control section 10 to detect whether or not a cartridge is loaded.

Further, the control unit 10 is connected to a film running detection switch (film switch) 16 as a feeding detection flat stage and a film winding completion detection switch (winding end switch) 18 as film winding completion detection means. There is.

The film switch 16 includes a roller portion that rotates in contact with the film, and an ON10 F switch due to the rotation of this roller portion.
The winding switch 18 has a switch section that is turned on and turned on 10 F F four times while the film is fed one sheet (see the timing chart in Fig. 5). ON when it rises to around 1
When the mechanical charging of the shutter and mirror is completed (when the film winding is completed), it is turned off.

These switches 16 and 18 allow the control section 10 to detect whether or not the film is actually fed.

Furthermore, the control unit IO includes a release switch 20 that activates a shutter mechanism and an aperture mechanism as exposure means.
and a back cover switch 22 that is turned on when the back cover is closed.

The control unit 10 also includes a release magnet 24 for performing release processing, an aperture magnet 26, and a front curtain magnet 2.
8 and rear curtain magnet 30, and film winding.
Wind motor 3 as a feeding means for performing rewinding processing
2. Liquid crystal display (LCD) 34 as display means
A display control section 36 that drives the is connected.

The control unit 10 performs control operations as described below.

When the film is loaded and the back cover is closed, the back cover switch 22 is turned from OFF to ON. If the main switch (not shown) is turned on in this state, the power is turned on. Since the film number counter data has been internally cleared with the back cover open, the camera enters a cueing process, controls the release magnet 24 and the wind motor 32, and starts cueing the film. At this time, by monitoring the film switch 16, display data corresponding to the feeding state is output to the LCD 34 and displayed in one display. Then, under the control of the wind motor 32, the winding end switch 18
The number of films is counted when the switch turns from ON to OFF.

The release control and the control of the wind motor 32 are repeated, and the number of films is counted when the winding switch 18 turns from ON to OFF.

Then, when the film counter reaches 4, that is, when four sheets of film have been wound, the wind motor 32 is stopped to complete cueing.

After completion of cueing, each time the release switch 20 is turned on, the release magnet 24, aperture magnet 26, front curtain magnet 28, and rear curtain magnet 30 are sequentially driven to perform exposure control, and after exposure, the wind motor 32 is activated. Start it up and wind up one sheet of film. When winding the film, film feed abnormality is detected by monitoring the film switch 16, and if there is an abnormality, the LC
Make the D34 display a predetermined display.

The structure of the film feeding abnormality detection device according to the present invention is as described above, and the general operation of this device will be explained below with reference to FIGS. 2 and 3.

FIG. 2 shows an example of the display of the winding state of the film when the film is loaded.

First, open the back cover of the camera, load the cartridge, pull out the film from the cartridge, place the tip of the film on the spool, engage the perforations with the teeth of the sprocket, close the camera back, and turn on the power in this state. Cue-finding is started, the wind motor 32 rotates, a predetermined number of constant release processes and film feeding are performed, and when a predetermined number of films (usually four) have been wound, the cueing ends.

During cueing, the film switch 16 repeats ON10 F F in conjunction with the running of the film.
F F is detected by the control section 10 and the signal thereof is sent to the display control section 36 . Upon receiving this, the display control section 36 changes the film display sections a, b, c, d to (a), (
a, b), (a, b, c), (a, b, c, d) light up in the order of the film running direction to indicate that the film is actually being fed ( Figure 2 (A)
).

In FIG. 2(C), [AP] is a focus mode display section 43 that indicates automatic focus adjustment mode, and rPROG, J is an exposure mode display section 44 that indicates that program exposure is auto. [1] is the film counter display section 45° which indicates that the number of shots is currently 1. The circle to the left of the film display section a lights up when a cartridge is loaded, and turns off when it is not loaded. Patrone display section 4 that displays whether or not there is a patrone.
It is 6.

When the film is poorly loaded and the film is not actually being fed even though the wind motor 32 is rotating, the film travel detection switch 16 is turned ON.
10 F F Therefore, as shown in FIG. 2(B), the display control section 36 lights up the cartridge display section 46 and does not light up the film display sections a, b, c, and d at all.

On the other hand, when the ON10FF of the film switch 16 cannot be obtained, the control section 10 determines this as a film feeding abnormality, and sends a feeding abnormality signal to the display control section 36 after the cueing operation is completed. Display control unit 3 that received this
6 is set to rEJ and blinks on the film counter display section 45 as shown in FIG. 2(D). Furthermore, the control unit 10 prohibits the operation of the magnets 24, 26, 28, and 30 due to the subsequent operation of the release switch 20 (release lock).

In other words, if a film feeding abnormality occurs during cueing, the film counter display section 45
is set to rEJ and blinks to issue an alarm, and the release operation is disabled to forcibly prevent subsequent photographing operations.

FIG. 3 shows the display on the LCD 34 in the film winding state during normal imaging.

First, when the release switch 20 is pressed, the release magnet 2413 and other magnets 26, 28, .
Thirty sequential controls are performed to expose the film.

After exposure, the wind motor 32 rotates to wind the film, and as the film is fed, the film switch 16 repeats ON10 F F.
Based on FF, the display control section 36 lights up the cartridge display section 46 in the same way as during cueing to indicate that the film is actually being fed, and displays the film display sections a,
b, c, and d are turned on in a continuous manner (Fig. 3 (A)).

Then, when the winding switch 18 is turned off, the control unit 10 stops the wind motor 32, assuming that the feeding of one sheet of film has been completed. Here, the display control section 36 increments the display on the film counter display section 45 by one, and lights up all the film display sections a, b, c, and d (FIG. 3(C)).

On the other hand, if the film is not actually being fed even though the wind motor 32 is rotating, the film switch 16 is normally turned ON10 F F.
L, no. Therefore, when no pulse is obtained from the film switch 16 during winding, the display control unit 3
6, as shown in FIG. 3(B), film display a, b
, c, and d are not lit.

When the winding of one film is completed, the winding switch 18 is turned on.
By the time the film switcher 6 turns OFF, the ON
10 FF When the F change number signal does not reach the specified value, the control section 10 determines this as a film feeding abnormality, sends this abnormality signal to the display control section 36, and the display control section 36 displays the film counter display section. 45 blinks (Figure 3 (D)),
To notify a camera user of the occurrence of a film feeding error.

In this way, if a film feeding abnormality occurs, the film display sections a, b, C, and d will blink and the film counter display section 45 will blink at rEJ when it occurs during cueing (Figure 2 (D)). If this occurs after cueing, the film counter display section 45 blinks (FIG. 3(D)) to issue an alarm.

FIG. 4 is a flow chart of the main operations of the control section 10 that performs the main controls in the film feeding abnormality detection device according to the present invention. Since this operation flowchart shows the general operation, it will not be explained in detail, but the operation will be as follows.

First, when the back cover is closed and the number of films is <4, the control section 10 determines that the beginning of the film is to be found (step 51), and performs the beginning of the film by skipping four sheets of film (step 5).
2) If the gap between the back covers or the number of films ≧4, the process proceeds to step 53 without processing.

When the release switch 20 is turned ON and the conditions for attaching the release receiver are satisfied (step 53), exposure processing for exposing the film is performed (step 54), and the release switch 20 is turned OFF or the release switch 20 is turned OFF.
If release is prohibited until focus is achieved even in N, the process proceeds to step 55 without processing.

If the exposure process is completed and the winding end switch 18 is ON (
Step 55), the wind motor 32 is activated to perform the winding process of winding one sheet of film (step 56). When the first winding switch 18 is OFF, it means that one winding is completed, so the process proceeds to step 57 without processing. .

In step 57, arithmetic processing such as photometry and automatic focusing (AF) is performed. When the process of step 57 is completed, the process returns to step 51 and the above-described process is repeated.

FIG. 5 is an example of a timing chart showing the operating states of each switch, motor, etc. during exposure processing and winding processing.6 As shown in FIG. Time ONL, along with the OFF of this release magnet 24, the front curtain magnet 28 and the rear curtain magnet 3 that control the exposure of the film.
0 are turned on at the same time to electromagnetically hold the leading and trailing curtains.

Further, the mirror is raised and an EE pulse is output. When the EE pulses are counted and reach a predetermined number, the aperture magnet 26 is turned on to maintain the aperture at a predetermined aperture. Then, the winding end switch 18 is turned on near when the mirror has finished rising.

When the mirror is completely raised, the leading curtain magnet 28 is turned off.
F is turned, the front curtain runs, and exposure begins. The aperture magnet 26 is de-energized at approximately the same timing as the front curtain is running.
F is given. Then, when the front curtain completes running during this exposure time, it outputs a light emission trigger that causes the strobe to fire.
The contact will turn ON and the strobe will fire if necessary.

When the exposure time ends, the trailing curtain magnet 30 becomes 0FFI.
, the second curtain runs, and the exposure of the film ends.

After the exposure time ends, the wind motor 32 is activated to wind the film, and the mirror is restored to its original state at the beginning of winding.

During winding of the film, the film switch 16 repeats 0N10FF in conjunction with the running of the film, and then, when the winding of one sheet of film is completed and the winding of the film is stopped mechanically, the leading edge switch 18
OFF is detected, the power supply to the wind motor 32 is stopped, and after a predetermined brake is applied, the wind motor 32 is made free.

FIG. 6 is a subroutine flowchart of the cue processing in the operation flowchart shown in FIG. 4. This cueing process is a process executed when loading film into a camera, and although the general operation has been described above, this operation will be explained in more detail.

First, in the first step 61 of cueing processing, the number of sheets (usually four) required for cueing is set. This is the controller l
It is obtained by subtracting the current number of films stored in the E''PROM of O from 4, and the RA in the control section 10 is calculated.
Store it in M1 (and set the number of films to E” F
The reason for storing the data in the ROM is to prevent the data on the number of film sheets from being erased even if the battery runs out during the flight and the battery is replaced.

Since the condition for calling the cue processing is that the number of films in E''FROM is <4, the values stored in RAMI will be from 1 to 4.

Next, the process proceeds to step 62, and the state of the winding switch 18 is checked. If it is OFF, winding has been completed, and the process proceeds to step 63. If it is ON, winding has not been completed, so step 63 is skipped and the process proceeds to step 64. and proceed.

In step 63, a release process for cueing is performed, that is, the release magnet 24 is energized for 4.5 ms to release the mechanical locking of the mirror, leading curtain, and trailing curtain, and the running of the leading curtain and trailing curtain is stopped. This is prohibited by energizing the front curtain magnet 28 and the rear curtain magnet 30, respectively, and a wait is performed for the time (approximately 60 m5) until the mirror mechanically completes its raising, and then the process proceeds to step 64.

In step 64, a winding process subroutine to be described later is executed. This winding process allows the film to
After the film has been wound up, the process proceeds to step 65, where 0N10FF information of the film switch 16 corresponding to the feeding of the film is obtained.

In step 65, DX data input processing is executed. In this embodiment, the loading detection means for detecting whether or not a film is loaded only uses the presence/absence information of DX film input here. However, separate switch data regarding the presence or absence of a cartridge or the presence or absence of a film may be input here and used as the loading detection means.

If DX film is loaded, the input DX
Since all data from 6 to DX2 is not always OFF, it is determined that DX is present and stored in RAM, and conversely, DX6 to
If all the data in DX2 is OFF, it is determined that there is no DX, the data is stored in the RAM, and the process proceeds to step 67.

In step 67, it is determined whether to detect the load error immediately based on the data in E" FROM, and Y
If ES, go to step 68, N.

If so, the process advances to step 70. This judgment is made by using the E"FROM data to provide a device that does not perform the remaining unnecessary windings if it is determined that there is a loading error based on the information of the film switch 16 when winding the first film. This is possible only by rewriting the .

However, since the reliability of loading is higher when winding up four sheets, E2FROM allows selection of either method.

In step 68, a load error check process described below is executed as a subroutine, and the process advances to step 69.

In step 69, it is determined whether or not a load error has been detected in step 68 and the executed load error check process. If it is a load error, the subsequent cueing process is interrupted and the process returns to the calling source, and if it is not a load error, the process returns to the calling source. If so, the process advances to step 70 to continue the cueing process.

In step 70, the release button set in step 61 is
Count down the number of windings (RAM1-RAMI-
1) and check whether the predetermined number of times has been completed. If the value does not reach 0 by the countdown, the process returns to step 62 and repeats the above-mentioned process, and if the value becomes 0, the process exits the cue loop and proceeds to the load error check process, which is also used as a subroutine.

In the load error check process, first in step 71,
The number of changes in the film switch 16 obtained when executing the winding process in step 64 is checked, and whether or not the film has been fed is determined by checking whether the number of changes in the film switch 16 is greater than a predetermined number (3 in this embodiment). to decide. If the film has been fed, the process proceeds to step 72; if the film has not been fed, the process proceeds to step 74.

In step 72, E" indicates that the film has been fed.
Processing for writing to FROM (E”PROM load b
it-1) is executed and the process proceeds to step 73.

In step 73, processing is performed when no load error is detected (load error bit of E" FROM = 0)
is executed, and the display during cueing on the LCD 34 (Fig. 2 (A)
) and display the normal image display (Fig. 2 (C)).
Return to the caller.

In step 74, it is determined that there was no film feeding.
Processing for writing to FROM (E”FROM load O
K bit-“0”) is executed and the process proceeds to step 75.

In step 75, it is determined whether DX is present or absent in the loading detection means processed in step 65, and if DX is present, the film is assumed to be loaded, and the load error process is derived from the determination in step 71 that film feeding is not present. is executed in step 76, and since no film is loaded when there is no DX, the process proceeds to step 73 and the above-mentioned processing is performed (FIG. 2(B)).

In step 76, the process (E" FROM load error bit-[IJ) indicating that a load error has been detected is executed, and the load error is displayed (FIG. 2 (D)).
Return to the caller. E2FROMOFF error b
it is also used in the judgment at step 53 in FIG. 4, and when this bit is "l", the release switch 20 is turned off.
NL, but I can't accept it.

In this way, in this embodiment, if a film feeding abnormality occurs when loading a DX film, as shown in Fig. 2 (
A display as shown in D) is displayed and the release operation is disabled, so that subsequent photographing operations cannot be performed.

FIG. 7 is a subroutine flowchart of the winding process in the operation flowchart shown in FIG. This process is performed when winding the film one sheet after the shadowing operation.
I will explain in more detail.

First, in step 81, the film switch 16 is turned ON10.
Clear the FF memory (A=B=O), clear the film switch change counter (-0), and proceed to step 82.

In step 82, the maximum energization time detection timer of the wind motor 32 is set to a predetermined value (1 second in this embodiment) and started. This makes it possible to detect overload when the winding end switch 18 cannot respond due to the end of the film, etc., and the process proceeds to step 83.

In step 83, the wind motor 32 is energized to start winding the film.

Proceed to step 84.

At step 84, the film switch 16 is switched on.

A process is performed to input the switch state of the winding tip switch 18 with chattering removed, specifically, data is input 200 times at 10 μs intervals, and the number of times OFF is input when ON is performed. , proceed to step 85.

In step 85, based on the data obtained in step 82, the winding end switch 18 is turned off without chattering (
OFF data count number = 200), the process advances to step 97 and the energization to the wind motor 32 is terminated. If the @complete switch 18 is not turned off without chattering (OFF data count number≠200), the process proceeds to step 86.

In step 86, the ON count data of the film switch 16 detected in step 84 is checked, and if it is ON without chattering (ON count number =
200), the process proceeds to step 87; otherwise, step 87 is skipped and the process proceeds to step 88.

In step 85, memory processing (A-1) indicating that the film switch 16 was ON is executed, and in step 88
Proceed to.

In step 88, the OFF count data of the film switch 16 detected in step 84 is checked, and if it is 0FFL without chattering (OFF count number = 200), proceed to step 89; otherwise, skip step 89. Then proceed to step 90.

The ON10FF storage process in steps 86 to 89 is a process for detecting the rising edge and falling edge of the pulse shown in FIG. 5, and the actual counting process of the rising edge and falling edge of the pulse is as follows. is executed.

In step 90.91, it is determined whether there is a rise or fall of the pulse of the film switch 16, based on whether the change state of the film switch 16 between ON and OFF has been previously stored. If there is a rising or falling edge (A=B=1), the process proceeds to step 92; otherwise, the process proceeds to step 93.

In step 92, memory bits A and B are cleared in order to detect the next change in the film switch 16, and since the film switch 16 has fallen or risen this time, the number of times the film switch has changed is counted up.
The film display section a shown in FIG. 3(A) displays the feeding state corresponding to the number of times the film switch is changed.

Processing is performed to turn on lights b, c, and d in order, and the process advances to the next step 93.

The table below shows the correspondence between the film switch change count data and the lighting of film display sections a, b, c, and d.

At step 93, the film switch 16 determines whether or not the winding is almost complete.
It is determined whether the number of changes is less than 7 times or not, and if winding is almost completed, that is, the number of changes is 7 or more, the process proceeds to step 95; otherwise, the process proceeds to step 94.

In step 94, it is checked whether the overload detection timer started in step 82 has timed out, and if it has not timed out, step 8
Returning to step 4, if the above-described process has timed out, the process proceeds to step 97.

In steps 95 and 96, since winding is almost completed, the chattering removal time of the first day of the winding switch is omitted, and the winding end switch 18 and the time-over detection are all taken care of. .

By doing this, the frame speed can be increased during continuous release, and even if the winding motor 32 is de-energized due to chatter in the winding end switch 18, winding will continue to complete due to mechanical inertia. A malfunction does not occur and the loop of steps 95 and 96 is exited when the winding end switch 18 is turned off or when a time over is detected, in which case the process proceeds to step 97.

In step 97, the winding motor 32 is turned off in the winding direction and the brake is applied to complete the film feeding operation and the process proceeds to step 98.

In step 98, the E" FR set during the one-head processing
The OM load 0Kbit is determined as the film loading detection means here, and when the load 0Kbit is [1], it is assumed that the film is loaded and the process proceeds to step 99.
Q], the process advances to step 101.

In step 99, the number of times the film switch changes is checked as a film feeding abnormality detection means, and if the film is being fed normally, that is, if the number of changes is at least one in this embodiment, step 100 is performed. otherwise go to step lot.

In step 100, since it is determined that there is a film feeding abnormality (perforation out) from step 98.99, the 1 display control section 36 causes the film counter display section 45 of the LCD 34 to blink without counting up (see FIG. 3). CD)) Performs processing and returns to the caller.

In step 101, processing is performed to confirm that the film feeding was normal, that is, the film counter is incremented by one count, this is displayed on the film counter display section 45, and the film display sections a, b, c, and d are all lit. (Figure 3 (C
)) Return to the caller.

According to this embodiment, if there is an abnormality in feeding, the film display sections a, b, c, and d will not blink normally during the film winding operation, so that the abnormality can be notified to the user. I can let you know. Then, after the winding operation is completed, the film counter display section 45 is made to blink.
This allows the user to be informed that there is an abnormality.

Furthermore, since the release is locked when the feeding abnormality is detected, there is no risk that the user will continue shooting without knowing about the abnormality.

The present invention has been described above based on the illustrated embodiment, but when a feeding abnormality is detected, both a warning on the LCD 34 and a release rotor, or only a warning on the LCD 34 may be performed.

"Effects of the Invention" As is clear from the above explanation, according to the present invention, it is possible to detect whether or not the film is actually fed, and when a feeding abnormality occurs, a feeding abnormality is displayed or By setting one or both of the settings to disable exposure, it is possible to completely prevent shooting failures due to the film not being fed, thereby increasing the reliability of the camera shooting. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a film feeding abnormality detection device according to the present invention, and Figs. 2 (A), (B), (C), and (D) show the winding state of the film when loading the film. 3 (A), (B), (C), (
D) is a diagram showing an example of the display of the film winding state during shooting, FIG. 4 is an operation flowchart of the device shown in FIG. 1, and FIG. 5 is a diagram showing each switch during exposure processing and winding processing. , a time chart showing operating states of motors, etc., FIG. 6 is a subroutine flowchart of the cueing process in FIG. 4, and FIG. 7 is a subroutine flowchart of the winding process in FIG. 10...Control unit (control means), 14...DX contact (
loading detection means), 16... film switch (feeding detection means), 18... winding end switch (feeding detection means),
20... switch release (exposure means), 28...
Release magnet (exposure means), 32... Wind motor (feeding means), 34... LCD (display means)
, 36...Display control section (display means), 45...Film count display section, a, b, c, d...Film display section Patent applicant Asahi Optical Co., Ltd. Agent Kuni Miura Husband Yoshimi Sasayama Diagram 1 Procedure Neho Authorized Book (Voluntary)

Claims (1)

[Scope of Claims] Film feeding means for feeding the film; loading detection means for detecting whether or not a film is loaded; feeding detection means for detecting feeding of the film; and: the film. an exposure means for exposing the film to light; a display means for displaying the feeding status of the film; and a display means for displaying the feeding status of the film; when the film is fed by the film feeding means, the loading of the film is detected by the loading detection means; If the feeding of the film is not detected by the feeding detecting means under the condition that 1. A film feeding abnormality detecting device comprising a control means for performing one or both of the above.