JPH02199438A - Shutter abnormality detecting device for camera - Google Patents

Abstract

PURPOSE:To prevent inappropriate exposure and to certainly control the actuation of a shutter by arithmetically operating the time of exposure based on the opening signal and the closing signal of the shutter and outputting an alarm signal when appropriate exposure is not executed. CONSTITUTION:Based on an opening and closing control signal from a control means C, a shutter driving means B is actuated. Then, the shutter A is actuated and opened in an opening direction after a prescribed time is delayed from the first transition of the signal. It is actuated and closed in a closing direction after a prescribed time is delayed from the last transition of the signal. The time until the last transition from the first transition is an opening time T0 which is previously fixed. An opening detection means D and a closing detection means E respectively detect the opening and the closing of the shutter A and output the opening signal and the closing signal. The means C arithmetically operates a real opening time T1 based on both signals and outputs the alarm signal when T1 not equal to T0. Thus, an alarm means F alarms the abnormal actuation of the shutter by a display, a buzzer, a release lock, the stop of the actuation or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera shutter abnormality detection device that enables proper exposure.

[Prior Art] Some cameras use an electrically controlled shutter that opens and closes using a motor or the like.

For electrically controlled shutters, for example,
As disclosed in the above publication, the first switch means detects whether the shutter is closed or not, and the second switch means detects whether the shutter is fully opened or not. The first discrimination circuit generates an output signal when the first switch means detects the non-occluded state of the shutter blade before the opening control signal is generated and after the closing control signal is generated. In the second discrimination circuit, the second switch means detects that the shutter blade is not fully open and generates an output signal when a blocking control signal is generated. Some devices are designed to determine whether the device is in the closed state or not and whether it has returned to the closed state, and to issue a warning in the event of malfunction.

[Problems to be Solved by the Invention] The shutter described above detects the open/closed state of the shutter and warns of malfunction of the shutter. Therefore, even if the shutter operation time is different and the prescribed exposure amount cannot be secured, as long as the shutter fully opens from a securely closed state and returns to a securely closed state again, it is considered to be operating normally, and the prescribed exposure time is It was difficult to detect anomalies when this could not be obtained.

The present invention has been made in view of the above, and an object of the present invention is to provide a camera shutter abnormality detection device that can monitor the operating state of the shutter and reliably manage a predetermined exposure time.

[Means for Solving the Problems] In order to solve the above problems, the camera shutter abnormality detection device of the present invention is a camera that controls opening and closing of the shutter based on the exposure time determined by the exposure control means of the camera. an opening detection means for detecting an opening of the shutter, an occlusion detection means for detecting occlusion of the shutter, and an exposure time calculated based on an aperture signal of the aperture detection means and a occlusion signal of the occlusion detection means. The present invention is characterized by comprising a control means for outputting a warning signal when it is determined that proper exposure is not performed by comparing the determined exposure time.

Further, the control means can determine appropriate exposure based on the shutter opening/closing control signal and the shutter opening signal and closing signal.

Further, by outputting a warning signal, an abnormality display, an abnormality alarm, a release lock, and an operation stop can be performed.

[Operation] The camera shutter abnormality detection device of the present invention calculates the exposure time based on the aperture signal from the aperture detection means and the occlusion signal from the occlusion detection means, and outputs a warning signal when proper exposure is not performed. . By calculating the exposure time in this way, it is possible to reliably determine appropriate exposure and prevent under-exposure and over-exposure.

In addition, when determining the appropriate exposure based on the shutter opening/closing control signal and the shutter opening signal and closing signal,
It is possible to reliably control the operation of the shutter.

Further, by outputting a warning signal, an abnormality display, an abnormality alarm, a release lock, and an operation stop can be performed to reliably warn the user.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic block diagram of a camera shutter abnormality detection device according to the present invention, and FIG. 2 is an operation time chart of the camera shutter abnormality detection device.

The shutter A of this camera is opened and closed by a shutter drive means B, and this shutter drive means B is controlled by a control means C.
The shutter A is opened and closed based on a predetermined opening time To.

The shutter driving means B is operated by the opening/closing control signal outputted from the control means C, and as shown in FIG. 2, the shutter A is operated in the opening direction and opened after a certain time delay from the rise of the opening/closing control signal. Then, after a certain time delay from the fall of the opening/closing control signal, the shutter A operates in the closing direction and closes. Moreover, the time from the rise to the fall of the opening/closing control signal is the predetermined opening time TO.

The opening of the shutter A is detected by an opening detection means, and the closure of the shutter A is detected by a closure detection means E. Based on the opening signal from the opening detection means and the occlusion signal from the occlusion detection means E, the actual opening time T1 is calculated as shown in FIG. 2, and if the actual opening time T1 is not performed, a warning signal is output.

This control means C manages the time T2 between the rise of the opening/closing control signal of shutter A and the opening signal, and the time T3 between the falling of the opening/closing control signal of shutter A and the closing signal. good. In this case, if T2 or T3 exceeds the predetermined time, it is determined whether the difference between the actual shutter opening time T1 and the predetermined opening time TO exceeds a predetermined tolerance, or whether the shutter opening/closing operation is slower than usual. If either is true, it can be determined that the shutter is abnormal.

In either case, if the actual opening time T1 is not a predetermined time, it is determined that the shutter is abnormal, and furthermore, shutter abnormalities due to causes such as the output state of the opening/closing signal or the operating state of the shutter drive means B are also accurately known. This allows for more appropriate exposure.

Furthermore, the alarm means F is driven by the warning signal from the control means C, and this alarm means F has a display, a buzzer release lock,
A warning is given of abnormal shutter operation by stopping the operation or the like. This alarm means F is activated when proper exposure is performed.
The alarm is released by driving the alarm release means G with a command from the control means C, and is performed, for example, by resetting.

Hereinafter, embodiments to which the camera shutter abnormality detection device of the present invention is applied will be described in more detail.

3 to 8 show a camera to which the present invention is applied; FIG. 3 is a front view of the camera, FIG. 4 is a rear view of the same, FIG. 5 is a plan view, and FIG. 7 is a view showing the display on the finder, and FIG. 8 is a view showing the display on the back cover.

As shown in FIG. 6, the camera body includes a main body 10, a front cover 20,
It is composed of a decorative panel 30 and a back cover 40, and a front cover 2
A decorative panel 30 is engaged with the front side of the front cover 2.
0 is engaged so as to cover the main body 10 and is screwed. The back cover 4o and the battery cover 41 are attached to the bearing part 42a of the main body mounting body 42.
The main body attachment 42 is engaged with the main body 10 and further fixed with screws.

The main body 10 is formed with an unexposed film storage chamber 14 and an exposed film storage chamber 15 with an image frame section 13 in between. The cartridge 1 is stored in the unexposed film storage chamber 14 and the exposed film F is wound up on a reel 16 provided in the exposure film storage chamber 15.

A front base plate 17 is provided in the center of the main body 10, and a lens barrel frame 2 equipped with a photographing lens 50 is mounted on this front base plate 17.
2 is integrally provided with the lens barrel 51 and is movable six times in the optical axis direction,
It is designed to collapse.

Further, a release button 2, a close-up button 3, and a main switch button 4 are provided on the upper surface of the front cover 20.

Photographing lens The photographing lens 50 is composed of four lenses in four groups, and is attached to the lens barrel frame 22 via supports 52 and 53, and the lens barrel frame 22 is attached to the lens barrel 51. This photographing lens 50 is of a between-type type in which a shutter 54 is disposed between the lenses.

The 7y (Togu:) 1-barrel finder mechanism uses an Alvada type bright frame see-through finder.This finder 60
Displays as shown in Fig. 7 are provided, including shooting range frames 61, 62, AF frame 63, rough distance measurement completion (lit) and distance warning (blinking) displays 64, and close-up mode (lit). A display 65, a grit mark 66, etc. are provided.

When photographing, the 1-frame focus adjustment mechanism changes the distance between the photographing lens 50 and the film surface according to the distance to the subject, and adjusts the focus so that the image of the subject is correctly focused on the film surface. . As a distance measuring mechanism for this focus adjustment, a light emitting AF lens 70 and a light receiving AF lens 71 are provided on the upper part of the front base plate 17, and are covered with AF windows 72 and 73 of the decorative panel 30. distance is used. A lens barrel 51 holding a photographic lens 50 is extended by the drive of a motor 170, and the lens group is driven straight to perform focus adjustment. The lens barrel 51 has a photographing window 55 on the front side, and this photographing window 55 is covered with a lens barrier 140 to protect the photographing lens 50 inside.

The shutter mechanism has the function of providing the necessary amount of exposure to the film over time and the function of blocking unnecessary light outside of the exposure time. A shutter motor 80 is driven to open and close the shutter 54, which is a program shutter and further uses a self-timer.

In order to give proper exposure to the Kou JLiL 4-state i-structure film, the amount of exposure is adjusted by measuring the brightness and darkness of the light on the subject side that falls on the screen. A CdS (cadmium sulfide) light receiving element 90 is used to convert an electrical signal according to the amount of incident light. This light receiving element 90 is attached to the front base plate 17 and covered by the AE light receiving window 91 of the decorative panel 30.

The interlocking range of exposure control is the film sensitivity 15OIO0, and the EV value of subject brightness is in the range of 5 to 17, and when the EV value is 9 or less, it is automatically switched to automatic strobe light emission.

This camera uses film in a cartridge with a DX code, and as soon as you put the film into the camera, the film sensitivity is automatically set to IS○50-3200.
All non-DX films are automatically set to a sensitivity of 15O100.

A flash tube 100 of the strobe mechanism is fixed above the unexposed film chamber 14 of the main body 10 and covered by a window 101 of the decorative panel 30. In the automatic strobe flash mode, the flash automatically fires when the subject brightness is lower than a predetermined value, and is always automatically charged. Ru.

Film Winding Structure The film winding mechanism uses an automatic winding system using a motor 110 and is driven via a winding unit 111. After closing the back cover 40, the film rewinding mechanism starts automatically by pressing the release button 2.The film rewinding mechanism automatically rewinds the film when the last frame has been photographed, and automatically rewinds the film when the rewinding is completed. Stop. For rewinding, the film counter is decremented and the film feed mark is displayed in the opposite direction.

In the case of DX film, rewinding is automatically stopped after the leading edge of the film is wound into the cartridge, and in the case of non-DX film, rewinding is automatically stopped with the leading edge of the film remaining.

The camera back 40 has a control display section 12 for auto date and shooting information.
0 is provided through the back cover base plate 44, and a film confirmation window 6 is further formed. Further, the LCD section decorative plate 1s0 of the camera back 40 includes a date display section 121 and a shooting information display section 12.
2 is provided. Furthermore, mode switching button SS1
There are provided a date mode switching button SS2, a correction point selection button SS3 for selecting a correction point for the year, month, day, and time, and an addition button SS4 for adding up the date display.

Each time the mode switching button SSI is pressed, automatic light emission mode, forced light emission mode, no light emission mode, and self-timer mode are cycled and switched in this order. In the automatic strobe flash mode, the strobe automatically fires when the subject brightness is below a predetermined brightness, and in the forced flash mode, the strobe always fires every time a photograph is taken.

In addition, in the non-emission mode, the mode switching button SSI
If you keep pressing , the mode switches from self-timer mode to mid-film rewind mode, and mode switch button S51
By pressing the release button 2 while pressing , rewinding of the film is started. When rewinding is complete, the camera automatically returns to automatic strobe firing mode.

One 3V lithium battery 8 is housed in the battery chamber 18 of the l-thick main body 10, and can be replaced by the user by opening and closing the battery cover 41. In addition, the 3V functions as a backup power source for the main power source as well as for auto-dating.
One coin battery 9 is provided in the battery storage chamber 45 on the back M40.

Auto Date As an auto date, a digital clock with a liquid crystal display is built into the control display section 120, and the date display section 121 provided on the LCD section decoration plate 1s0 on the 4° back cover displays "year, month, day,"
``Day, month, year,'' ``date, hour, minute, or rOFF mode'' is displayed, and the above-mentioned date mode switching button SS2 is displayed.
, a correction point selection button S83 for selecting a correction point such as year, month, day, hour, minute, etc., and an addition button s8 for adding the date display.
It is adjusted by operating 4.

As shown in FIG.
2b and a film feed indicator 122C.

In addition, a strobe charging mode 122d, a self-timer mode 122e, an automatic flash mode 122f, a forced flash mode 122g, and a non-flash mode 122h are switched and displayed, and all are displayed on a liquid crystal display.

Figures 9 to 12 show the operating mechanism of the lens barrel. Figure 9 is a cross-sectional view of the lens barrel, Figure 10 is a cross-sectional view of X=X in Figure 9, and 11 is a cross-sectional view taken along the line XI-X+ in FIG. 9, and FIG. 12 is a cross-sectional view taken along the line ■-■ in FIG.

As shown in FIG. 10, a support frame 21 is attached to the front base plate 17.
A lens barrel 51 is provided on the support frame 21 so as to be movable forward and backward in the optical axis direction, and the lens barrel 51 is collapsible. Furthermore, the lens barrel frame 22 is fixed to the lens barrel 51, and the two operate as one.

A support portion 22a formed at the lower end of the lens barrel frame 22 supports the bearing 1.
57 to be slidably supported on a guide shaft 158, and also movably supported on a drive shaft 160 via a female threaded bearing 159 as shown in FIGS. 10 and 11. One end of the guide shaft 158 is fixed to a press plate 161 and the other end is fixed to the front base plate 17, one end of the drive shaft 160 is rotatably supported by the press plate 161 fixed to the front base plate 17, and the other end is fixed to the front base plate 17. 17 via a bearing 162, and rotation of the drive shaft 160 causes the lens barrel frame 22 to move linearly in the optical axis direction. A tip 163a of a position regulating member 163 pushed through the front base plate 17 is in contact with the support portion 22a of the lens barrel frame 22, and this position regulating member 163 is attached to the front base plate 1 via a spring 164.
7, which absorbs the backlash between the drive shaft 160 and the female threaded bearing 159 of the lens barrel frame 22, allowing the lens barrel frame 22 to operate accurately. The female screw bearing 159 is supported by a presser plate 165 fixed to the support portion 22a of the lens barrel frame 22, and this presser plate 165 prevents the female screw bearing 159 from coming off from the lens barrel frame 22. .

The drive shaft 160 is provided with a drive gear 166, which is connected to an intermediate gear 167.1 as shown in FIG.
The output gear 171 of the motor 170 is meshed with the output gear 171 of the motor 170 through the intermediate gears 167, 168, 169, and the drive screw is transmitted to the drive gear 166 through the intermediate gears 167, 168, 169. axis 160
Rotate.

The motor 170 is provided with a rotary blade 172, and the rotation speed thereof is detected by a photocoupler 173 and used as control information for moving the lens barrel 51 in the optical axis direction. Note that a photocoupler is a detection element that arranges a light source and a light receiving element to face each other and detects whether or not there is an opaque object between the light source and the light receiving element.

Further, as shown in FIG. 10, an operating member 174 is provided on the mounting portion 22a of the lens barrel frame 22, and this operating member 174
A contact piece 175 is provided. As shown in FIGS. 10 and 12, this contact piece 175 is adapted to slide on a control board 176 in conjunction with the lens barrel 51. This control board 176 is attached to the wall 17b of the front base plate 17, and the control board 176 is provided with a power supply contact 175b and camera body side contacts 1750 to 175g.
1 is extended in the optical axis direction, the contact piece 175 moves to the collapsing stop position Y1, the initial position Y2 for normal photography, the base point Y3 for counting the amount of advance for normal photography, the initial position Y4 for close-up photography, and the count of the amount of advance for close-up photography. Information about the base point Y5 is given to the control section, and these constitute a switch that detects the position of the photographic lens 50. This switch functions as a lens position switch or an AF trigger switch depending on the relationship with the contacts 1750 to 175g on the camera body side.

This control board 176 has a protrusion 176a at one end engaged with a recess 17c of the front base plate 17, and a stopper 177.1 of the presser plate 161 with the other end 176b fixed to the front base plate 17.
78 and is supported movably in the optical axis direction. A position adjustment window 176c is formed in this control board 176, and an adjustment bolt 179 is screwed into the wall 17b of the front base plate 17 through this position adjustment window 176c. Mounting shaft 179a of this adjustment bolt 179
is located at a position offset from the center of the head 179b, and the control board 176 is moved in the optical axis direction by rotation of the adjustment bolt 179 to adjust the position.

As shown in FIG. 9, inside this lens barrel 51, a shutter drive mechanism and the like are arranged, and when the release button 2 is operated, a motor 80 is driven, and the power is transmitted from an output gear 81 to intermediate gears 82, 83, 84. Shutter ring 8 through .85
6, the shutter ring 86 is rotated, and the three shutter blades 54c are opened and closed. Each of these shutter blades 54
C is rotatably supported by the lens barrel 51 via a support pin 87, and an engagement hole 54a is formed at the base of the shutter blade 54c.
An operating pin 88 fixed to a shutter ring 86 is engaged with this engagement hole 54a, and the rotation of this shutter ring 86 opens and closes the shutter blades 54c.

The shutter ring 86 always has its protrusion 86b aligned with the lens barrel 51.
It is set so as to come into contact with a stopper 89a fixed to the side, and the stopper 89b serves as a position control during the opening operation.

A contact piece 54b is formed on the shutter blade 54c, and a photocoupler 99 detects this contact piece 54b to perform time management for shutter control and detect shutter abnormality.

As shown in FIGS. 9 and 10, the Balarax positive light receiving side AF lens 71 rotates in the direction of the arrow with respect to the front base plate 17 using the support pin 180 as a fulcrum in accordance with the extension of the photographing lens 50.
Vararax correction is possible. This support pin 1
A spring 181 is installed between the support portion 71a of the light-receiving side AP lens 71 and the front base plate 17 on one side of the lens 80, and a correction spring 183 is installed between the support portion 71b and the balax correction pin 182 on the other side. ing. The balax correction pin 182 moves the lens barrel frame 22 in the optical axis direction together with the lens barrel 51, thereby pushing the light-receiving side AF lens 71 via the correction spring 183. Light receiving side AF lens 7
A parallax adjustment lever 185 is attached to the upper part of the lens barrel 184 with a parallax adjustment bin 184, and the protrusion 71c of the light-receiving side AF lens 71 comes into contact with this parallax adjustment lever 185 to regulate the rotational position of the lens barrel. While the lens 51 moves between the initial position Y2 for normal photography and the initial position Y4 for close-up photography, balax correction for perspective switching is performed.

Photography Mode Switching Structure In the camera of this embodiment, when the release button 2 is pressed, a series of operations related to photographing begin, and the exposed film winds up one frame and ends. Lurie's switch S1
is turned ON, and in the subsequent stroke, the second release switch S2 is turned ON. Lurie's switch S1 is O
When the time reaches N, shooting preparation operations such as distance measurement to measure the subject distance and photometry to measure the brightness of the subject are performed, and when the second release switch S2 is turned on, the shutter opens and closes.
Photography and post-photography processing operations such as film winding are performed.

The closest shooting distance of general cameras is often set at around 0.6 to 1°2m, but with the camera of this example,
A normal photography mode and a close-up photography mode are provided in order to enable photographing of objects at a closer distance, so-called close-up photography, and to expand the photographable distance range. In the normal shooting mode, it is possible to shoot subjects from a predetermined normal shooting close distance to infinity (this range is called the normal shooting range), and in the close shooting mode, it is possible to shoot subjects from a predetermined close shooting close distance to a predetermined close shooting distance. It is possible to photograph objects at long distances (this range is called a close-up photography range), and the close-up distance for normal photography and the extreme distance for close-up photography are matched to make the normal photography range and the close-up photography range continuous. However, for example, three shooting modes, such as a close-range shooting mode, a medium-distance shooting mode, and a long-distance shooting mode, may be provided, or two shooting modes, such as a super close-up shooting mode, a close-up shooting mode, and a normal shooting mode, may be provided.
More than one shooting mode may be provided.

The close-up button 3 is a button for switching the shooting mode. When this button is pressed in the normal shooting mode where the lens barrel 51 is at the initial position Y2 for normal shooting, the close-up switch is turned on, and the lens barrel 51 switches to the close-up shooting mode. reaches the initial position Y4 and stops, and the camera switches to close-up shooting mode. When the close-up button 3 is pressed when the camera is in close-up shooting mode, the close-up switch is turned on, the mirror W451 moves backwards, reaches the initial position Y2 for normal shooting, and stops, and the camera is in normal shooting mode. Switch to.

When the lens barrel 51 is at the collapsing stop position Y1 and the camera is in the carrying position, pressing the main switch button 4 turns on the main switch, energizes the power, and starts operating the MAIN CPU 201, which will be described later. , a power hold is performed to maintain the excited state of the power source, and the lens barrel 51
is extended, reaches the initial position Y2 for normal shooting, and stops.
The camera goes into normal shooting mode and power hold is released. When the camera is in the normal shooting mode or the close-up shooting mode, pressing the main switch button 4 turns the main switch ON, power is held in the same way as above, and the lens barrel 51 moves back to the collapsing stop position Y1. The camera reaches the mobile position and stops, and the power hold is released. The lens barrier 140 covering the photographing window 55 opens in conjunction with the extension of the lens barrel 51, and closes in conjunction with the retraction of the lens barrel 51 to cover the photographing window 55 and protect the photographing lens 50. It is structured to do this. Furthermore, when the camera is in the portable position, operations other than automatic film loading and film rewinding cannot be performed.

Control Circuit FIG. 13 is a schematic circuit block diagram of a camera to which the present invention is applied.

This camera has MAINCPU201 and 5UBCPU2.
02 is used, and information is exchanged alternately through the serial interface. The MAIN CPU 201 controls the drive system that requires a large current and executes control sequences for camera shooting operations, and the SUBC CPU 202 drives the shooting information display section 122 of the camera back unit 203, and also provides switch information to the MAIN CPU 201 to control the MAIN CPU 201.
+201 is made to perform various controls.

A power supply is connected to the DC-DC converter 204, and the DC-DC converter 204 is activated when the main switch is turned on or the Lullies switch S1 is turned on.
It is activated by power control from the UBCPU 202. As a result, the voltage Vdd becomes
01, and the MAIN CPU 201 starts up. Further, a voltage Vcc is supplied from the DC-DC converter 204 as a power source for the control switches other than the release switches S1 and S2, the main switch, the close-up switch, and the mode changeover switch, and a voltage Vdd is supplied as a power source for each CPU, and a lithium battery 8 The voltage vb is 5UBCPU
202 and the strobe unit, and the voltage vb' of the lithium battery 8 is a power source for a drive system that requires a large current.

In addition, there is a D in the strobe unit 205 that is different from 204.
A C-DC converter is provided.

The activated MAIN CPU 201 contains analog information 20 including battery check information BC1, photometry information AV, temperature information TH for temperature compensation of the motor driver, and shutter trigger delay time information STD for correcting the shutter opening.
It is entered as 6. This battery check information BC is transferred to the 5UBCPU 202 via a serial interface, and the 5UBCPU 202 displays this information as a battery remaining amount display 122a. Furthermore, MAINC
Switch information 207 of the Dx switch, lens position switch, and AF trigger switch is input to the PU 201.

In addition, distance measurement information is captured as an analog signal from the AF unit 208, and if the distance measurement result is within the photographable distance range according to the shooting mode selected at that time,
A with F white display control by MAINCPU201
The PLED is turned on, the CULED is turned on in the case of close-up shooting mode, and the LBLED is turned on when the subject brightness is below a predetermined value in the automatic flash mode, and these constitute the F white display 209. However, a distance measurement completion and distance warning display 64, a close-up mode display 65, and a brick mark 66 are displayed in the finder. In addition, the APLED blinks when the distance measurement result is outside the shooting distance range according to the shooting mode selected at that time, and the LBLED lights up when the forced flash mode is on, and when the subject brightness is set to a predetermined value in the non-flash mode. Flashes when the value is below.

The MA I NCPU 201 is the second release switch S.
2 is turned ON, lens motor control is performed to control the lens motor driver 210 based on distance measurement information, and the motor 170 is driven to extend the photographic lens 50 and stop it at a predetermined position. At this time, the position of the photographing lens 50 is controlled based on the trigger information of the AF trigger switch produced when the contact piece 175 comes into contact with the main body side contact 175e or 175G and the motor rotation speed information from the photocoupler 173. Since the photographing lens 50 is extended according to the distance measurement information, the trigger information from the AF trigger switch determines the base point Y3 or Y5 (
(varies depending on the selected photographing mode), and control is performed to stop the motor 170 when it has rotated a predetermined amount from the count base point Y3 or Y5. Then, according to the photometric information AV, shutter motor control is performed to control the shutter motor driver 211, and the motor 80 is driven to operate the shutter 54 and expose the film. At this time, the opening and closing of the shutter 54 is detected by the photocoupler 99.

When this exposure is completed, the lens motor driver 21
0 is controlled, and the photographic lens 50 is set to the initial position Y2 or Y.
4 (depending on the selected shooting mode),
A film motor control is performed to control the film motor driver 212, and the motor 110 is driven to wind the film. At this time, while reading the switch information from the perforation switch 213, it is checked whether the film has been wound by one frame.

The 5UBCPU 202 sends a charging signal to the strobe unit 205, and the strobe unit 205 sends a charge completion signal to the 5UBCPU 202, thus performing EF control between the two. Light emission control of the strobe unit 205 is performed by the MAIN CPU 201, and the flash tube 100 emits light. The self-timer display 5 LED 214 is controlled by the external display control of the 5UBCPU 202.

The 5UBCPU 202 is driven by a coin battery disposed on the back cover 40, a voltage Vdd from the DC-DC converter 204, and a voltage vb from the lithium battery 8 via a backup circuit 215 and a reset circuit 216.

Further, switch information 217 such as a release switch, main switch, close-up switch, back cover switch, etc. is input to the 5UBCPU 202, and
has a date module 218, which receives switch information 219 from the date mode switch, select switch, and set switch, and drives an LCD drive that outputs a liquid crystal display drive signal for date imprinting and date display. Let's do it. Also, 5U
The BCPU 202 outputs signals for driving the counter and other liquid crystal displays disposed on the back cover unit 203, and drives the counter LCD. In addition, the back cover unit 20
3 is provided with a mode changeover switch 220, which enables mode changeover by manual operation.

Control circuit sequence Figure 14 shows the operation sequence of the circuit block of the present invention, and the sequence of MAINCPυ201 and the 5U
It is divided into BCPU202 sequences.

The 5UBCPU 202 receives the IR by the reset signal ACL.
It is initialized by the 3ub routine, starts operating from the start, and monitors the input of information to the microcomputer from the MODE=1 determination. Then, when the 51=1 determination turns on the Lurys switch S1, a film autoload error is determined by the flag φAL=1 determination, and if the 51=1 determination indicates an autoload error, the ALS
The ub routine (2) displays an autoload error and ends. Also, the flag φREW-EN
If it is determined that D=1 and the film has finished rewinding, R
The camera moves to the EWS sub screen (3) and displays the end of film rewinding, and even if the first Lurie switch S1 is ON, it will not operate unless the camera back is opened. Furthermore, the flag φ
If 5TT=1 is determined and the shutter is abnormal, the system branches and does not accept the signal.

If these flags are not set, apply a power halt with PH←1 to start up the power, and then turn on the MAIN CPU.
Start 201. When the MAIN CPU 201 is started, the I10 port is set and the RAM is cleared by lloSET%RAMCLR, a battery check is performed by the BC3ul) routine, and DX switch information is read by the DXSub routine.

Read each piece of information and use the serial interface on the SO to convert the battery check information, DX switch information, and test information into 5 bits of information.
Serially transferred to UBCPU202, BC display Sub
Display the remaining battery power in a routine. Here, if the remaining capacity of the battery 8 is less than a predetermined value, an error E is assumed and the operation is stopped.

If the remaining capacity of battery 8 exceeds a predetermined value, 5UB
SO of CPU202, LD2 of MAINCPU201
Information for the LD2Sub instruction is sent to the Sub routine for 6 lines, and a branch 1 determination is made at the SI of the MAIN CPU 201. When the program moves to the LD2Sub routine, the lens position is checked and the collapsing stop position and the like are determined by flag φSEP.

In the LD2Sub routine, if the lens position is the initial position for normal shooting, the MAIN CPU 201
The process moves to branch 1 judgment. On the other hand, in the 5UBCPU 202, the lens position is the initial position for normal shooting, and the flag Φ
If rewinding is completed with REW=1 judgment,
At So, the REWSub instruction information is transferred to MAINCPυ201 and the process ends.

If the camera back is open according to the camera back switch information in the 5b=o determination, the flag φ゛ALB = 1 in the WSu
The program moves to the b routine and transfers the WSub instruction information to the S1 branch 2 determination of the MAIN CPU 201. Flag φC=
If the counter is zero in the 0 judgment, the flag φDX = 1
It is determined whether the loaded film is a DX film or not, and if it is a non-DX film, an AL Sub is sent to the SI branch 2 determination of the MAIN CPU 201 at SO.
After the instruction information is transferred, the 5UBCPU 202 enters the autoload waiting state, and the MAINCPU 201 enters the ALS
The autoload operation is performed by the ub routine.

If the film is counted up, or if the counter is zero and it is a DX film, the information transferred by the LD2Sub reach is determined and the φ5EP
When =11, the lens barrel 51 is at the initial position for normal photography or close-up photography, so photography is possible; when Φ5EP=OO, the lens barrel 51 is at the collapsing stop position, so the process ends and Φ5EP In the case of =01, the lens barrel 51 was extended but stopped at an undetermined position, so it is moved back and is at the retracted stop position, so the automatic light emission mode is returned to and the process ends.

When the lens barrel 51 is at the initial position for normal photography or close-up photography, the second release switch S2 is turned off by the Sl±1 determination.
If it is F, charge the strobe main capacitor in the CHGSub routine, and if it is ON, the flag Φ
If TEST=1 is determined and the test mode is set, test processing is performed, and if it is not the test mode, S.

The data is transferred using the serial interface. here,
MainRout main routine instruction, flag φMO
The DE mode information and the counter information of the flag φC are 4-bit information and are transferred to the SI branch 2 determination of the MAIN CPU 201.

The 5UBCPU 202 is waiting in the AFSub routine, and the MAINCPU 201 makes a branch 2 judgment with SI, goes to the AESub routine in 9 lines, reads photometry information, further reads distance measurement information in the AFSub routine, and sends this distance measurement information to the 5UBCPU 202. AFSu
Transfer to routine b. This distance measurement information is R[AF] or R[cAF], R[AP'l is RAM information for distance measurement in normal shooting mode, and R[CAF] is RAM information for distance measurement in close-up shooting mode. Also, 4 bits are transferred twice.

Then, the 5UBCPU 202 determines 52=1 and waits for the second release switch S2 to be turned on, and the MAINCPU 201 uses the FLEDSub routine to turn on the APLED for distance measurement, and in the case of close-up shooting mode, turns on the CULED. lights up when the subject brightness is lower than a predetermined value in automatic flash mode or when in forced flash mode.
The ED lights up, and the APLED blinks and lights up if the distance measurement result passes beyond the shooting distance range or continues.
The BLED is in a non-emission mode and blinks when the subject brightness is lower than a predetermined value.

When the second release switch S2 is turned ON by S2;1 judgment of 5UBCPU202, the serial transfer port of Sin changes from the normal low state to high state at Sinm1, and the 5
Send the information of tn=t to MAINCPυ201 and send 5UB
The CPU 202 waits for 16m5 hours, changes to S i neo, ensures that 8 lines are sent to Sl from the FLEDSub routine of the MAIN CPU 201, and then determines whether or not it is in the self-timer mode by determining the flag ΦMODE.

If not in self-timer mode, R[ST
D] Transfer the information to MAIN CPU 201 in 8 bits. This STD information is 8-bit information of the shutter trigger relay time film, and after winding the film,
Information is exchanged in the Sub routine, and the information is sent to M.
Load it with AINCPU201's WSub routine, 5
This information is transferred to the UBCPU 202, and the 5UBCPU 202 stores this information.
I'm posting it to 1. For self-timer mode, 5E
Transfer R[STD] after moving to LFSub re-chin.

When this STD information is sent to MAINCPU201, S
The 5UBCPU 202 waits in the 5DSub routine, and the MAIN CPU 201 determines whether the ISO zone is 4 or higher, and if the I is 5O400 or higher, DATE←1.
The lighting time for imprinting can be changed. Then, DATEX←1 is set, and this signal is output for 5 ms as a signal for emitting light to imprint the date. When this signal is output, the light is emitted for about 10 ms and the date is imprinted.

When this is completed, initialize by setting DATEX←01DATET←O, and use the AFLDSub routine to initialize the shooting lens 5.
0 is fed out, and the shutter 54 is opened and closed in the 5DSub routine. If an activation signal for the shutter 54 is not received while the shutter 54 is being opened or closed, a flag ΦSTT is generated. If a failure occurs during the opening or closing process of the shutter, a flag ΦSTT is set.
1, and this information is sent to the 5UBCPU 202 to determine if there is a problem.

If there is no abnormality, the flag Φ5TT=O is sent, and MA
The INCPU 201 returns the photographing lens 50 in the LDR5ub routine, and moves to the WSub routine to wind the film.

The 5UBCPU 202 uses the flag ΦMODE to determine whether or not it is in the self-time mode, and if it is not in the self-time mode, the process shifts to film winding in the WSub routine. In the case of the self-timer mode, the mode display is set to automatic light emission mode, the flag φMODE is set to automatic light emission mode, and then the process moves to winding of the WSub reachin film.

The operating sequence as described above takes place, but with 5 UBC
In the PU 202, the mode switch is activated from the start, and before the Lurie's switch S1 is pressed, it is determined whether the mode switch is ON or OFF in the MODE=1 determination, and the MODE is set to 1.
That is, if the mode switch is ON, the flag Φ5TT=1
Shutter trouble is determined based on the judgment, and in the event of an abnormality, no further signals will be accepted. If it is normal, the mode display is switched, and the flag ΦMODE is used to switch the mode information, and the flag ΦMODE is used to determine the self-timer mode, and when it is not the self-timer mode, the M
Wait until the mode switch is released when ODE=0 is determined, and then return to MODE=1 determination.

In the case of self-timer mode, 1 second is set in the timer at T4-18, and if the mode switch is set to ON for 1 second at MODE = 1 judgment, the feeding display is evacuated and the self-display is set at Tover judgment. 0FFL, the rewind display blinks. Then, in this blinking state, when the second release switch S2 is turned on with a judgment of 52=1, PH←1,
Set φAL←0, start the MAIN CPU 201, restore the feeding display, set the automatic light emission mode, set the feeding display to 0FFL/, display the battery tick in the BC display sub routine, and MA the REWSub instruction information with So.
The data is serially transferred to the INCPU 201, and the film is manually rewound midway through the REWSub routine.

Furthermore, if the second release switch S2 is not turned on, if the MODE=1 determination indicates that the mode switch is OFF, the rewind display is turned off, the feed display is roughly restored, and the automatic flash mode is displayed. , flag ΦMOD
Set E to automatic flash mode and exit. If it is determined that MODE=1 and the mode switch is ON, it waits for the second release switch S2 to turn ON.

Then, when the 5UBCPU 202 determines Sl;1 and the Lullies switch S1 is OFF, when the main switch is turned ON and 5cn=1, collapsing switching is performed. Here, the collapsible barrel switching flag ΦScu is 0, and the PH
← Set it to 1 and start the MAIN CPU 201. Further, when the close-up switch is turned on and 5cu=1, close-up collapsing switching is performed and the collapsing switch flag is set to ΦScu←1.

Flags ΦBC, ΦDX, 4) from MAINCPU201
After receiving the TEST information, display the battery check using the BC display subroutine, and display the LDI using the serial output of so.
Sub instruction, flag ΦScu information is MAIN CPU20
Transferred to 1. This 6 (7) information is MAINCPU2
01 (7) SI<7) sent to branch 1 judgment, LDISu
The lens barrel is driven in routine b, and the flag φSEP information is transferred to the 5UBCPU 202, and the lens position is checked from this flag φSEP information in the LDISub routine. When the flag Φ5EP=11, the lens barrel 51 is at the initial position for normal photography or close-up photography, and the strobe capacitor is charged in the CHGSub routine. When the flag Φ5EP=00, the lens barrel 51 is at the collapsing stop position, and when the flag Φ5EP=01, the lens barrel 51 has been extended but stopped at an undetermined position, so it has moved back and is at the collapsing stop position.
Normal shooting mode is selected, automatic flash mode is displayed,
The flag φMODE is set to automatic light emission mode and the process ends.

The 5BSub routine of the 5UBCPU 202 checks the status of the camera back at 1 second intervals, and monitors whether the camera camera back is opened based on camera back switch information.

Next, the test mode will be explained. This test mode is for checking the camera's performance, and tests are performed using the counter display on the back cover. Flag φTES
When determining T=1, 5 LED←1 in test mode
By setting the test mode, the test mode is confirmed and four types of tests are performed: automatic flash mode, forced flash mode, non-flash mode, and self-timer mode. TESTI information is transferred in automatic flash mode, and the second Lurie's switch S1
When is ON, the zone information when metering is displayed, and when the second release switch S2 is turned ON, the shutter is released and the automatic exposure mechanism can be tested, and both metering information and exposure amount information are tested. .

TEST2 information is transferred in forced flash mode, and flashmatic is read from DX information. The DX information is displayed for each zone, and the aperture value can be controlled using Flashmatic according to the displayed information. In this test, the counter and feeding display are cleared and 5 LEDs are set to 0, and charging is performed using the CHGSub routine. In addition, the TEST3 information is transferred in the non-emission mode, the AF zone information is displayed with the first Lurie switch S1, and the second release switch S2 drives the lens and extends it to the AF information, which causes the shooting lens to move. You can know the movement stroke.

TEST4 information is transferred in the self-timer mode, and a test is performed to see if the shutter is open using the Lullies switch S1.

These mode tests can be canceled with the mode switch.

Furthermore, when the flag φ5TT=1 in the 5UBCPU 202, the sequence of symbol C is entered, the transfer segment is evacuated, all segments are blinked for a predetermined period of time, and then returned to lighting, and when 51=0 is determined, the No. 1 Lurie's switch S1 is activated. Wait for it to finish.

Also, in the above operation sequence, the sequence starting from symbol 1 turns off the power hold at PH-0, waits for 200 m5, and ends with 51=0 and MODE=O1Scn=O1Scu=O. Also, the sequence from symbol E is entered due to battery abnormality, etc., and flag ΦBC← is used to protect the battery.
00, turn off the battery, and turn off the power hold in the same way as above.

Shutter flowchart FIG. 15 is a flowchart of shutter operation.

Initialize the shutter by driving the motor 80,
A timer is set to limit the closing operation time of the shutter blades, and the value of the shutter opening signal ST is determined (steps 1 to 4). If the shutter opening signal ST does not become O even after a predetermined period of time and the shutter is open,
After applying the brake to the motor 80, the motor 80 is driven to operate the shutter in the closing direction (steps 5 and 6).
, further applies the brake and sets the shutter abnormality flag ΦST.
Set T to 1 to output a warning signal.

Further, in step 3, if the shutter opening signal ST becomes 0 within a predetermined time and the shutter is closed, the input time STD of the shutter opening signal ST is calculated, and then the shutter opening time TAE is calculated (step 9.1
0). As a result, the shutter is driven, and a timer that limits the opening time of the shutter blades and a timer that determines the shutter opening time TAE are set, and the shutter opens within a predetermined time and the shutter opening signal ST becomes 1.
If not, step 5 hejjump (step 1
1 to 14), set the shutter abnormality flag ΦSTT←1. When the shutter opening signal ST becomes 1 within a predetermined time and the shutter open time TAE has elapsed, the shutter is driven in the closing direction, a timer is set, and even after the predetermined time elapses, the shutter closes and ST becomes 0. If not, jump to step 7 (steps 15 to 1).
9).

The shutter closes within a predetermined time and the shutter opening signal S
When T becomes 0, the shutter opens and closes normally, and the shutter abnormality flag φSTT is set to 0.
Applying the brake to the motor 80 and ending the process (step 20)
~22).

Also, in the flowchart of FIG. 15, step 1
In step 2, a timer is also set to measure the actual opening time of the shutter, and in step 18, this timer is stopped. During this time, the time is compared with a predetermined time TAE, and if the difference exceeds a predetermined tolerance, step A timer and comparison/judgment means may be provided so as to jump seven degrees. In this case, when the timer that measures the actual opening time of the shutter exceeds a separately determined time, it is necessary to jump to step 7.

Although not shown in FIG. 15, the warning means F in FIG. 1 monitors the shutter abnormality flag φSTT, and when φSTT is 1
When this occurs, one or more of an abnormality display, abnormality warning, release lock, or camera operation stop is performed to warn the user of the shutter abnormality.

Also, according to steps 5 to 7, depending on the type of abnormality,
I try to close the shutter as much as possible.

[Effects of the Invention] As described above, the camera shutter abnormality detection device of the present invention calculates the exposure time based on the aperture signal of the aperture detection means and the occlusion signal of the occlusion detection means, and makes sure that proper exposure is performed. Since a warning signal is output when there is no exposure time, it is possible to reliably determine appropriate exposure and prevent under-exposure and over-exposure by calculating the exposure time.

In addition, when determining the appropriate exposure based on the shutter opening/closing control signal and the shutter opening signal and closing signal,
It is possible to reliably control the operation of the shutter.

Further, by outputting a warning signal, an abnormality display, an abnormality alarm, a release lock, and an operation stop can be performed to reliably warn the user.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a camera shutter abnormality detection device according to the present invention, FIG. 2 is an operation time chart of the camera shutter abnormality detection device, and FIGS. 3 to 12 show a camera to which this invention is applied. Fig. 3 is a front view of the camera, Fig. 4 is a rear view of the same, Fig. 5 is a plan view, Fig. 6 is a sectional view taken along Vl-■ in Fig. 3, and Fig. 7 is a view showing the viewfinder display. , FIG. 8 is a diagram showing the display on the back cover, FIG. 9 is a sectional view of the lens barrel, FIG. 10 is a sectional view taken along line XX in FIG.
Figure 1 is a (-■ cross-sectional view of Figure 9, and Figure 12 is a cross-sectional view of Figure 10.
13 is a schematic circuit block diagram of a camera to which the present invention is applied; FIG. 14 is an operation sequence of the circuit block of the present invention; and FIG. 15 is a shutter operation flowchart. In the figure, A is the shutter, B is the shutter driving means, and C is the shutter.
is a control means, D is an opening detection means, E is a blockage detection means, F
is an alarm means, and G is an alarm release means. Figure Figure 11 Figure 12

Claims (1)

[Scope of Claims] 1. In a camera that controls opening and closing of a shutter based on an exposure time determined by an exposure control means of the camera, an opening detection means detects an opening of the shutter, and an opening detection means detects a closing of the shutter. The exposure time is calculated based on the occlusion detection means, the aperture signal of the aperture detection means, and the closed base signal of the occlusion detection means, and compared with the determined exposure time, it is determined that proper exposure is not performed. A camera shutter abnormality detection device comprising: a control means for outputting a warning signal when the abnormality of a camera shutter is detected. 2. The camera shutter abnormality detection device according to claim 1, wherein the control means determines appropriate exposure based on a shutter opening/closing control signal, and a shutter opening signal and closing signal. 3. The camera shutter abnormality detection device according to claim 1 or 2, wherein the output of the warning signal performs abnormality display, abnormality alarm, release lock, and operation stop.