JPH0850325A - Display device for camera - Google Patents

Abstract

PURPOSE:To prevent a film from being erroneously exposed by giving a first display state to a display device when a rewinding action is normally executed and giving a second display state different from the first display state to the display device when the rewinding action is detected to be abnormal. CONSTITUTION:This device is provided with a feeding motor 14 executing the rewinding action of the film, a detection circuit 17 detecting the abnormality of the rewinding action and an LCD 19 displaying information on the rewinding action. When the rewinding action is normally executed, the first display state is given. When the abnormality is detected by the detection circuit 17, such an action that the second display state different from the first display state is given to the LCD 19 is executed. Therefore, when the film is abnormally stopped in the midst of the rewinding action thereof, the number of frames that the film is abnormally stopped is displayed by flickering and a user is informed that the film is abnormally stopped so as to prevent the photographed film from being exposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for a camera.

[0002]

2. Description of the Related Art As a display device of a camera, for example, there is one which displays a film feeding state. This display device
The counter display (numerical value display) indicates the number of frames taken on the film and the rewinding state of the film.
Regarding the film rewinding operation, a pulse signal is generated corresponding to the film rewinding, and the film rewinding completion is detected when the pulse signal is not input for a predetermined time.

[0003]

However, when the completion of the rewinding of the film is detected because the pulse signal is not input for a predetermined time, the following problems occur. That is, during rewinding, the film stops due to some abnormality (for example, film catching or gear biting),
When the pulse signal stops being input, the camera erroneously determines that the rewinding of the film has been detected, and accordingly, the rewinding completion is displayed.
Therefore, when the user sees the rewind completion display, the problem arises that the back cover is opened and the film that has been abnormally stopped is exposed, although the rewind is not actually completed. .

Therefore, an object of the present invention is to, when an abnormal stop occurs during the rewinding of a film, display the number of frames where the film is abnormally stopped by blinking to inform the user that the film is abnormally stopped. Another object of the present invention is to provide a display device for a camera that prevents exposure of a film that has been shot.

[0005]

The present invention will be described below in association with FIG. 1 showing an embodiment. (1) According to claim 1, at least the feeding device 14 that executes the film rewinding operation, the display device 19 that displays information regarding the rewinding operation, and the detection device that detects an abnormality in the rewinding operation. 17, and when the rewinding operation is normally performed, the display device is provided with a first display form, and the display device is provided with the first display form in response to detection of the abnormality by the detection device. And a control device 1 for providing a second display form different from.

(2) According to a second aspect, the display device can display at least the number of frames of the film, and the first display mode displays the number of frames according to the rewinding operation. Addition or subtraction is displayed,
The second display form is a blinking display of the number of frames when the abnormality is detected. (3) According to claim 3, the feeding device 14 for winding and rewinding the film, the pulse signal generating device 17 for outputting a pulse signal in response to the movement of the film by the feeding device 14, and the pulse signal. A counting device 1 for counting the pulse signals output from the generator 17, and a pulse signal generator 17
When the counting device 1 counts a predetermined pulse signal while the film is being wound by the timer device 1 and the feeding device 14, the winding device 1 stops the winding of the feeding device 14. When the counting device 1 does not count the predetermined number of pulse signals by the time when the time measuring device 1 completes the time measurement of the predetermined time during the film winding by the first control device 1 and the feeding device 14, The end detection device 1 that determines that the end of the film is detected by stopping the feeding by the device 14, and the second end that starts rewinding by the feeding device 14 when the end of the film is detected by the end detection device 1. When the counting device 1 does not count a predetermined number of pulse signals by the time when the timing device 1 completes the timing of the predetermined time during the rewinding of the film by the control device 1 and the feeding device 14, the feeding device 14 The rewinding completion detection device 1 that determines that the rewinding of the film has been stopped and that the rewinding of the film has been detected, and the counter that displays the number of frames of the film by the counting device 1 counting a predetermined number of pulse signals. When the display device 19 or 20 and the rewinding completion detecting device 1 determine that the rewinding of the film is detected, the film display of the counter display device 19 or 20 displays the number of frames corresponding to the rewinding completion. If not, the determination device 1 and the counter display device 1 that determine that the film has stopped abnormally
When it is determined that the determination device 1 is abnormally stopped, 9 or 20 blinks the frame number display of the film for a predetermined time.

(4) According to claim 4, when the rewinding completion detecting device determines that the rewinding of the film is detected, the counter display device includes the second control device 1 for prohibiting the photographing operation. 19 continues blinking for a predetermined time until the second control device 1 releases the prohibition of the photographing operation. (5) According to claim 5, the lid switch device 5 for detecting the opening / closing of the lid for taking out the film is included, and the prohibition of the photographing operation of the second control device 1 is released by the lid switch device 5. It is when it is detected that the lid for taking out the item is opened.

[0008]

[Action]

(1) According to claim 1, the display device is provided with the first display mode when the rewinding operation is normally executed, and the display device is provided with the first display form in response to the detection of the abnormality.
The second display form different from the display form of is given. (2) According to claim 2, the display device can display at least the number of frames of the film, and the first display form is
The number of frames is added or subtracted according to the rewinding operation, and the second display mode is to perform the blinking display of the number of frames when an abnormality is detected.

(3) According to claim 3, when the judging device 1 judges that the film is abnormally stopped, the counter display device 1
9 blinks the frame number display of the film for a predetermined time. (4) According to the fourth aspect, after determining that the rewinding completion detecting device 1 has detected the rewinding completion of the film, the photographing operation is prohibited and the frame number display continues to blink for a predetermined time. (5) According to the fifth aspect, the lid switch device 5 for detecting opening / closing of the lid for taking out the film is provided, and the prohibition of the photographing operation is released by opening the lid.

[0010]

【Example】

(1) Description of Configuration FIG. 1 is a block connection diagram of an embodiment of a display device for a camera according to the present invention. In FIG. 1, reference numeral 1 is a CPU that performs display control. It consists of a one-chip microcomputer that integrates a timer and pulse counter, and controls the entire camera sequence. Reference numeral 2 is a power supply circuit connected to a power supply and supplies a power supply voltage to each part of the camera. 3 is a main switch for starting and ending the power supply to each part of the camera, 4 is a manual U-turn switch for starting film rewinding, and 5 is a back side which is turned on / off by opening / closing a back cover (not shown) for storing the film. Lid switch,
6 is a half-push switch that is turned on by half-pressing a release button (not shown), and 7 is a release switch that is turned on by full-pressing the release button. When the main switch 3 is set to on, the system turns on, and when it is set to off, the system turns off and holds the state. Further, the back cover switch 5 is turned on when the back cover is opened and turned off when the back cover is closed, and the state is maintained. On the other hand, when the manual U-turn switch 4 is operated, the switch is turned on only while the switch is being operated. When the release button is operated, the half-push switch 6 or the release switch 7 is turned on only while the release button is being operated.

Reference numeral 8 is a photometric circuit for measuring the subject brightness, and 9 is a focus adjustment information detection circuit for detecting focus adjustment information.
Reference numeral 10 is a shutter motor 1 for opening and closing a shutter (not shown).
1 is a shutter drive circuit for driving 1. The shutter motor 11 is, for example, a step motor. Reference numeral 12 is a motor drive circuit for driving a feeding motor 14 for feeding a film (not shown) and a lens barrel motor 13 for moving a lens barrel 15 described later.

Reference numeral 15 is a lens barrel that holds the photographing lens and is moved in and out, 16 is a lens barrel position detection circuit that detects the position of the lens barrel 15, and 17 is a film position detection that detects the film feed amount. Circuit. Each position detection circuit outputs a pulse corresponding to the moving amount of the lens barrel 15 and the film, and the CPU 1 detects the position and the moving amount of the lens barrel 15 and the film by measuring the number of pulses. The position detecting circuit is, for example, a photo interrupter or a photo reflector.

Reference numeral 18 denotes an electronic flash device which emits auxiliary light in response to the output of the photometry circuit 8 when the subject has low luminance. Reference numeral 19 denotes a liquid crystal display (hereinafter, referred to as LCD) provided on the upper surface of the camera, which displays exposure information, the number of shot images, and the like. Reference numeral 20 denotes a pointer display device provided on the upper surface of the camera, for example, and displays the exposure information, the number of shots, etc., like the LCD.

(2) Description of Operation FIG. 2 is a flow chart showing the main processing by the CPU 1. When the main switch 14 is turned on, the CPU 1
The processing of this flowchart is started. In step S1 of FIG. 2, the registers and the like inside the CPU 1 are initialized.
In step S2, it is determined whether or not the back cover (not shown) is opened. If the determination is positive, the process proceeds to step S3, and the back cover lock is released. In step S4, the counter display is "E"
Turn it on.

If the determination in step S2 is negative, the process proceeds to step S5 and it is determined whether or not the manual U-turn switch 4 is on. If the determination is positive, step S6
5, the rewinding process shown in FIG.
Proceed to 7. If the determination in step S5 is negative, the process proceeds to step S7 and it is determined whether or not the back cover is locked. If the determination is positive, the 6-second display timer is started in step S8. In step S9, it is determined whether or not the rewinding is normally completed. If the determination is affirmative, the counter display is made to blink "E" in step S10. When the determination in step S9 is negative, the counter display blinks the current display, that is, the current frame number display blinks in step S11.

In step S12, it is determined whether or not the 6 second display timer has timed out. If the determination is positive, the counter display is switched from blinking to lighting in step S13, and the process proceeds to step S14. If the determination in step S12 is negative, it is determined in step S14 whether the start switch is on. If the determination is negative, step S1
Return to 2 and wait for the start switch input. Step S14
If the determination is positive, the process returns to step S2. When the determination in step S7 is affirmative again, the 6-second timer is updated in step S8.

When the determination in step 7 is negative, the process proceeds to step S15 and it is determined whether or not the halfway press switch is on. If the determination is affirmative, the process proceeds to step S16, and it is determined whether or not the back cover has changed from open to closed. When the determination is negative, the process proceeds to step S17, the photographing process of FIG. 3 described later is performed, and the process proceeds to step S19. If the determination in step S16 is affirmative, the process proceeds to step S18, and the initial winding process is performed. Here, the film is wound up to the first frame. If winding fails here, or
If there is no film, it is judged that there is no film. When this process ends, the process proceeds to step S19.

In step S19, it is determined whether the main switch is on. If the determination is positive, step S
Return to 2. If the determination in step S19 is negative, the process ends. (3) Description of Shooting Process FIG. 3 is a flowchart showing details of the shooting process in step S17 of FIG.

In step S101 of FIG. 3, a battery check is performed. That is, the voltage of the battery is measured and it is determined whether the voltage value is an operable voltage. In order to accurately measure the voltage value of the battery, it is desirable to measure with the load applied to the battery. Therefore, for example, the battery is measured with the shutter motor 11 energized. If the determination in step S101 is negative, the process returns, and if the determination is affirmative, the process proceeds to step S102.

In step S102, a signal is sent to the focus adjustment information detection circuit 9 to start focus detection processing. In step S103, a signal is sent to the photometric circuit 8 to start the photometric processing. In step S104, AE calculation is performed based on the photometric result to obtain the aperture value and shutter speed. In step S105, FM calculation is performed on the basis of the focus detection result to obtain a shootable distance when the electronic flash device 18 is used.

In step S106, step S102
A focus lens (not shown) incorporated in the lens barrel 15 is moved based on the focus detection result. Step S107
Then, it is determined whether or not the release switch 7 is on. If the determination is negative, the process proceeds to step S108, and it is determined whether the half-push switch 6 is on. If the determination is positive, the process returns to step S107.

When the determination in step S108 is negative, the process proceeds to step S109, the focus lens is retracted to the reset position which is a predetermined initial position, and the process returns. On the other hand, if the determination in step S107 is affirmative, step S
In step 110, it is determined whether or not the self mode is applied. The self mode is a mode in which a shutter (not shown) is operated after the time specified by the self timer elapses after the release switch 7 is turned on. Step S
When the determination at 110 is affirmative, the process proceeds to step S111, and the timer is counted for a time designated in advance by the self-timer.

If the determination in step S110 is negative,
In step S112, it is determined whether the red-eye mode is set. The red eye means that the light of the electronic flash device is reflected by the capillaries of the fundus of the subject person to photograph the eye red. For this reason, the red-eye mode is one in which weak light is emitted from the electronic flash device to the subject person before exposure (hereinafter referred to as pre-emission) to close the pupil before exposure.
If this red-eye mode is selected, step S1
Proceeding to step 13, pre-emission is performed for a predetermined time before exposure. If the red-eye mode is not selected, the process proceeds to step S114.

After the processes of steps S111 and 112 are completed, the process proceeds to step S114, and the shutter opening process for opening the shutter is performed. Then, after the predetermined time calculated by the above-described AE calculation has elapsed, the process proceeds to step S115, and shutter closing processing for closing the shutter is performed. In step S116, the focus lens is retracted to a reset position which is a predetermined initial position. In step S117, it is determined whether the back cover is open or there is no film. If the determination is positive, the winding process is not performed and the process returns. If the determination in step S117 is affirmative, the process proceeds to step S118, the winding process of FIG. 4 described later is performed, and the process returns.

(4) Winding Process FIG. 4 is a flowchart showing details of the winding process in step S115 of FIG. In FIG. 4, step S2
In 01, it is determined whether or not the value of the film counter is "37". Here, the film counter is information on the number of shots of the film, which is displayed on the LCD or the pointer display device, for example. The initial value is "0", and +1 (addition) is added every time one frame is taken up and rewound. It is decremented by -1 each time one frame is rewound. Therefore, this "37" indicates that it is the 37th sheet of film, and it is assumed that the end of the film is detected regardless of the input of the pulse signal. If the determination in step S201 is affirmative, the process proceeds to step S202 and the feed motor 14 is rotated in the normal direction. The normal rotation referred to here is to drive the feed motor 14 in the winding direction, and the reverse rotation is to drive the feed motor 14 in the rewinding direction. WAIT is performed for a predetermined time in step S203, and the feeding motor 14 is stopped in step S204. Here, as a process of stopping the feeding motor 14, a short brake or a reverse energization brake is used. When the process of step S204 ends, the process proceeds to step S210.

If the determination in step S201 is negative,
Proceeding to step S205, the feed motor 14 is normally rotated. In step S206, timer A is started. In step S207, the film position detection circuit 17
It is determined whether or not a pulse signal output according to the moving amount of the film is input. If the determination is affirmative, the process proceeds to step S208, and it is determined whether the timer A has timed out. If the determination is negative, step S207
Return to If the determination in step S208 is affirmative, it is determined that the end of the film has been detected, and the feeding motor 14 is stopped in step S209. In step S210, the rewinding process of FIG. 5 described later is performed and the process returns.

If the determination in step S207 is negative,
In step S211, it is determined whether the number of pulses counted by the pulse counter is a predetermined number of pulses. When the determination is negative, the process returns to step S206 and the timer A is updated. If the determination in step S211 is affirmative, it is determined that the film has been wound by one frame, and step S21 is performed.
In step 2, the film counter is incremented by 1 and displayed. The timer A is stopped in step S213, the feeding motor 14 is stopped in step S214, and the process returns.

(5) Rewinding process FIG. 5 shows step S6 of FIG. 3 and step S21 of FIG.
It is a flowchart which shows the detail of the rewinding process of 0. In FIG. 5, in step S301, the feeding motor 14 is rotated in the reverse direction to start rewinding. In step S302, timer B is started. In step S303, it is determined whether or not the pulse signal output from the film position detection circuit 17 according to the moving amount of the film is input. When the determination is affirmative, the process proceeds to step S304, and it is determined whether the number of pulses counted by the pulse counter is a predetermined number of pulses. When the determination is negative, the process returns to step S302 and the timer B is updated. If the determination in step S304 is affirmative, the process proceeds to step S305, the film counter is displayed by subtracting -1 (subtracted) from the currently displayed number, and the process returns to step S302.

If the determination in step S303 is negative,
In step S306, it is determined whether timer B has timed out. If the determination is negative, step S3
Return to 03. If the determination in step S306 is affirmative,
When it is judged that the film rewinding is completed, step S3
In step 07, the feeding motor 14 is stopped. Step S3
In 08, the back cover lock is designated regardless of whether or not the rewinding of the film is normally completed, and the photographing operation is prohibited until the back cover is opened.

(6) Modified Example Although the LCD is used as the display device in the above embodiment, for example, a pointer display device or the like may be used. In the pointer display device, the pointer is moved according to the movement of the film, and when the film is abnormally stopped during rewinding, the abnormal stop can be notified by indicating the number of frames in which the film is stopped by the pointer.

Further, in the pointer display device, there is a case where the rotation direction of the pointer is limited and it is not possible to display according to the number of frames when the film is rewound. In that case, the display of the normal rewind completion state is displayed. By stopping the pointer at a position different from that, it is possible to notify the user of the abnormal stop.

[0032]

【The invention's effect】

(1) According to claim 1, the display device is provided with the first display mode when the rewinding operation is normally executed, and the display device is provided with the first display form in response to the detection of the abnormality.
Since the second display form different from the display form of No. 1 is given, it is possible to make an accurate determination without the user erroneously recognizing whether or not the rewinding is completed. Therefore, there is no risk of exposing the film to light accidentally.

(2) According to the second aspect, the display device can display at least the number of frames of the film, and the first display mode is the addition or subtraction display / the number of frames according to the rewinding operation. Alternatively, the display differs from the number of frames by blinking, and the second display form is by blinking the number of frames when an abnormality is detected. Therefore, it is possible to improve the distinguishability of the rewind state for the user.

(3) According to claim 3, after the completion of rewinding of the film is detected, whether or not the film is abnormally stopped is judged by the number of frames displayed on the counter display. Since the frame number display of the counter display is made to blink for a predetermined time, it is possible to prevent the film which has been photographed from being exposed due to the user opening the lid to take out the film when the rewinding is completed.

(4) According to the fourth and fifth aspects, after detecting the completion of the rewinding of the film, the photographing operation is prohibited, the frame number display of the counter display continues to blink, and the lid for taking out the film is opened. Since it was decided not to release the prohibition of the shooting operation, it is possible to prevent double exposure of the film already shot.

[Brief description of drawings]

FIG. 1 is a block connection diagram of an embodiment of a display device of a camera according to the present invention.

FIG. 2 is a flowchart showing a main process of a CPU shown in FIG.

3 is a flowchart showing a photographing process of a CPU shown in FIG.

FIG. 4 is a flowchart showing a winding process of the CPU shown in FIG.

5 is a flowchart showing a rewinding process of the CPU shown in FIG.

[Explanation of symbols]

 1 CPU 2 Power Circuit 3 Main Switch 4 Manual U-Turn Switch 5 Back Cover Switch 6 Half Press Switch 7 Release Switch 8 Photometric Circuit 9 Focus Information Detection Circuit 10 Shutter Drive Circuit 11 Shutter Motor 12 Motor Drive Circuit 13 Lens Tube Motor 14 Feed Motor 15 Lens barrel 16 Lens barrel position detection circuit 17 Film position detection circuit 18 Electronic flash device 19 LCD 20 Pointer display device

Claims (5)

[Claims] 1. A feeding device that performs at least a film rewinding operation, a display device that displays information regarding the rewinding operation, a detection device that detects an abnormality in the rewinding operation, and the rewinding operation. Control for giving a first display form to the display device when normal, and giving a second display form different from the first display form to the display device when the abnormality is detected by the detection device And a display device for a camera. 2. The display device for a camera according to claim 1, wherein the display device is capable of displaying at least the number of frames of the film, and the first display mode is according to the rewinding operation. The addition or subtraction display of the number of frames / or blinking of a display different from the number of frames is performed, and the second display mode is to perform the blinking display of the number of frames when the abnormality is detected. A display device for a camera, characterized in that 3. A feeding device for at least rewinding a film, a pulse signal generator for outputting a pulse signal in response to movement of the film by the feeding device, and a pulse output from the pulse signal generator. A counting device that counts a signal, a timing device that counts a predetermined time after a pulse signal is input from the pulse signal generation device, and rewinding by the feeding device, automatically according to the end detection of the film. A first control device that starts at any time, or arbitrarily starts regardless of the detection of the end, and during the rewinding of the film by the feeding device, by the time counting device until the time counting device completes the time counting of a predetermined time. When the predetermined pulse signal has not been counted, the rewinding completion detection device that judges that the rewinding by the feeding device is stopped and the rewinding completion of the film is detected A counter display device for displaying the number of frames of the film by counting the number of predetermined pulse signals by the counting device, and the counter when the rewinding completion detecting device determines that the rewinding of the film is detected. And a determination device that determines that the film has stopped abnormally when the number of frames displayed on the film of the display device does not indicate the number of frames corresponding to the completion of rewinding, and the counter display device includes the determination device. Is a display device for a camera, which blinks the frame number display of the film for a predetermined time when it is determined that the film is abnormally stopped. 4. The display device for a camera according to claim 3, further comprising a second control device that prohibits a photographing operation when the rewinding completion detecting device determines that the rewinding completion of the film is detected. The display device of a camera, wherein the counter display device continues to blink for a predetermined time until the second control device releases the prohibition of the photographing operation. 5. The display device for a camera according to claim 3, further comprising a lid switch device for detecting opening / closing of a lid for taking out a film, wherein the photographing operation prohibition of the second control device is released. A display device for a camera, which is when the lid switch device detects that the lid for taking out the film is opened.