JP2575448B2 - Motor driven camera - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-driven camera, and more particularly to a camera in which a film winding operation and a shutter charging operation are each performed by a dedicated motor.

[Prior Art] In recent years, motorization of cameras has been advanced, and each operation of the camera such as film winding operation, shutter charging operation, mirror driving operation and the like is automatically performed by a built-in motor. .

Such a motor-driven camera is disclosed in
As disclosed in Japanese Patent Application Laid-Open No. 53-141615, a film winding operation and a shutter charging operation are simultaneously performed by a single motor built in a camera. As shown, two series of reduction gear trains are provided for one motor built in the camera, and the rotation direction of the motor is switched according to the state of the power supply battery and the state of the load to select the reduction gear train. Performing a film winding operation and a shutter charging operation respectively, and further, as disclosed in Japanese Patent Application Laid-Open No. 60-254028, a film winding operation and a shutter charging operation,
There are already known motors which are operated by independent motors.

By the way, when considering from the viewpoint of the energy required to drive each operating mechanism of the camera, the film winding operation and the shutter charging operation require considerably more energy than the operation of the other operating mechanisms. I do.
Above all, the film winding operation is greatly affected by the temperature, and the load increases as the temperature decreases. For example, at −20 ° C., the film hardens and the film winding load becomes 3 to 5 times that at normal temperature. Also, as is well known, the power supply battery is also greatly affected by the temperature, and even if the battery has sufficient capacity and does not decrease the predetermined voltage at room temperature, the predetermined voltage drops when used in a low-temperature environment. There is a phenomenon.

On the other hand, in single-lens reflex cameras in recent years, the performance of the shutter has been improved, and the charging energy has been increasing in order to increase the shutter curtain speed in order to increase the maximum shutter speed.

From this point of view, it is more advantageous for a motor-driven camera to provide a motor for film winding and a motor for charging a shutter, etc. In addition, it is desirable to select and drive simultaneous driving (parallel driving) and sequential driving (serial time-series driving) according to the state of the load.

Recently, the one that responded to this request has been
No. 9533 proposes this. That is, as shown in FIG. 9, when the shutter is operated and the exposure is completed, the drive start signal S3 becomes H
Become a level. Accordingly, the drive control signal S1 from the control circuit 105 becomes H level, and the voltage of the power supply battery 103 is supplied to both the shutter drive motor 101 and the film feed motor 102 via the drive circuit 104. You.

Then, the shutter charge and the like are started by rotating the shutter driving motor 101, and the film winding is started by rotating the film feeding driving motor 102. During the film winding, the feeding speed is detected by the film feeding speed detecting circuit 106. If the detected speed is equal to or higher than the set reference value, the speed detection signal S2 becomes H level. circuit
By the operation of 105, the drive control signal S1 continuously goes to the H level. Accordingly, in this case, the rotation of both motors 101 and 102 is controlled simultaneously, that is, in parallel, so that the film is wound and the shutter is charged.

On the other hand, when the film feeding speed is not equal to or higher than the set reference value, in other words, when the film feeding speed is low, the speed detection signal S2 goes to L level.
The drive control signal S1, which is the output of 5, goes low.

Then, the drive circuit 104 temporarily stops the state in which the two motors 101 and 102 have been driven in parallel by the H level signal from the drive start signal S3. Then, since only the shutter driving motor 101 is driven, only the charge driving of the shutter, the mirror, and the aperture mechanism is performed by the shutter driving motor 101. Then, when this driving is completed, the film feed driving motor 102 is driven again, the film is wound, and a series of driving operations are completed,
The shutter is reset to the initial state and is ready for the next shutter release.

[Problems to be Solved by the Invention] However, when the conventional technical means disclosed in Japanese Utility Model Application Laid-Open No. 62-129533 is used, the following problems occur. That is, as described above, since the film is hardened by a decrease in temperature, the amount of force required for winding the film greatly changes depending on the temperature. That is, the load at the time of winding greatly changes with temperature. Further, the film is generally wound in a patrone, but the hoisting load greatly varies depending on this state, that is, the degree of the wound state.

Therefore, in the case of continuous shooting in which continuous shooting of a plurality of frames is performed, the film feeding speed greatly changes depending on environmental conditions such as the temperature and the degree of tightening, and the first one frame is sequentially driven, the next one is simultaneously driven, Then, in the next one frame, a sequential drive occurs. Such a phenomenon can also occur during the winding of one frame.

When such an operation is performed, even if the user is shooting under exactly the same conditions, the operation sequence becomes faster or slower, so that the user may infer that the camera has an abnormality, or This may cause anxiety as to whether the photographing is being performed normally.

An object of the present invention is to solve the above-described disadvantages, and have a film winding dedicated motor and a shutter charge dedicated motor,
After the shutter operation is completed, the motor dedicated to shutter charge is driven and its rotation speed is detected. If the battery capacity is sufficient and the load is small, simultaneous drive is performed. If the battery performance is reduced and the load is increased. An object of the present invention is to provide a motor-driven camera which automatically switches to sequential driving and stably performs detection for this switching.

Means and Action for Solving the Problems In order to solve the above problems, the present invention provides a motor drive including a first motor for winding a film and a second motor for charging a shutter and the like. A means for detecting a rotation speed of the second motor; and a second motor driven after the shutter operation is completed. If the output of the detection means is faster than a predetermined value during the driving, the second motor is driven. Control means for driving the first motor at the same time and starting driving the first motor after the driving of the second motor ends when the second motor is slower than a predetermined value. The motors are driven, the rotation speed of the motors is compared with a predetermined speed, and simultaneous driving and sequential driving of both motors are controlled.

In a motor-driven camera including a first motor for winding a film and a second motor for driving a mirror and charging a shutter, means for detecting an operation speed of a mirror; Means for determining whether or not the operating speed is higher than a predetermined speed; and, when the determining means determines that the operating speed is higher than the predetermined speed, simultaneous drive control for simultaneously driving the two motors is performed. Control means for performing sequential drive control for sequentially driving both motors when it is determined that the speed is lower than the predetermined speed.

Hereinafter, the present invention will be described with reference to the illustrated embodiments.

FIG. 1 shows an example in which the present invention is applied to a single-lens reflex camera employing a vertical-moving focal plane shutter. Light transmitted through a photographic lens (not shown) mounted on a lens mount 41 of the camera body enters the camera body, and is moved by a movable reflection mirror 15 obliquely inclined at an angle of 45 ° on the photographic optical axis 0. The light is reflected upward and is transmitted and diffused to the focusing screen 42. The light image of the focusing screen 42 is observed as an erect image in the viewfinder through the pentaprism 43 and the eyepiece 44.

The motor 1 is a second motor that performs a shutter charging operation and a mirror driving operation, and an output gear 2 composed of a pinion gear is fixed to a rotating shaft thereof. The transmission gears 3 and 4 are composed of step gears having different diameters, and reduce the rotational force of the output gear 2 to reduce the intermediate gear 5.
To communicate. A cam driving gear 6 meshing with the gear 5 is integrally provided with a plate cam 6a for driving a mirror and a plate cam 6b for charging a shutter. A contact piece 7 is attached. A first drive lever 9 is disposed in the vicinity of the plate cam 6a so as to be rotatable about a support shaft 9a. One end of the first drive lever 9 slides on the cam surface of the mirror drive plate cam 6a. A moving small roller 9b is rotatably mounted, and a small roller 9c is also rotatably mounted on the other arm end. A mirror driving lever 11 is provided near the movable reflecting mirror 15 so as to be rotatable around a support shaft 11a, and a pin 11b which is in contact with the small roller 9c is fixed at a lower end thereof.
The movable opposite mirror 15 is obliquely provided on the photographing optical axis 0 so as to be able to rotate upward about a support shaft 15a, and is provided by a mirror lowering spring 16 which is stretched between an unillustrated stationary member. The flat body is urged downward, and is in contact with the mirror positioning pin 17 in the viewfinder observation state. When the mirror driving lever 11 rotates clockwise around the support shaft 11a, the upper end 11c pushes up a pin 15b fixed to the upper side of the movable reflection mirror 15 to thereby raise the mirror 15. It is going to rise.

A second drive lever 10 is provided in the vicinity of the plate cam 6b so as to be rotatable about a support shaft 10a.
A small roller 10b that slides on the cam surface of the shutter charging plate cam 6b is rotatably attached to one arm end, and a small roller 10c is rotatably attached to the other arm end. I have. The support shaft 12a is located near the mirror 15.
A shutter charge lever 12 is provided so as to be rotatable around the center, and a pin 12b which is in contact with the small roller 10c is fixed to a lower end thereof. A connection pin 12c is also fixedly planted at the upper end of the lever 12. In addition, lever 12
A weak spring 18 is stretched between an unillustrated immovable member and a rotating behavior in a counterclockwise direction.

Behind the movable reflection mirror 15, a known vertical running focal plane shutter 13 is provided, and when the lever 12 rotates clockwise against the elasticity of the spring 18, the pin 12c Since the pin 14a fixed to the shutter charging member 14 is pushed up, the shutter is charged by this.

On the other hand, a first motor 20 for winding the film is provided in the film take-up spool 26, and an output gear comprising a pinion gear is mounted on a rotating shaft thereof.
21 is fixed. The transmission gears 22, 23, and 24 are each constituted by a step gear having a different diameter.
Is reduced and transmitted to the intermediate gear 25. The intermediate gear 25 is a drive gear 26 provided on the spool 26.
meshed with a. Further, a plurality of locking claws 26b are provided on the outer periphery of the spool 26, and the rotation of the spool 26 causes the perforation of the film 31 to be hooked, thereby
It is designed to wind 31. Driven sprocket shaft 27
Has a well-known engaging claw 27a, 27b that engages with the perforation of the film 31, and a gear 27c at the upper end, and the film
It rotates in synchronization with the movement of 31. The gear 28 meshing with the gear 27c is integrally provided with a conductive contact piece 29 that slides on the substrate 30 on the lower surface thereof.

FIG. 2 is an enlarged view showing the operation of the plate cams 6a and 6b integrally attached to the cam drive gear 6, and FIG. 2 (A) shows a viewfinder observation state before release, and FIG. FIG. 7B shows a state in which the movable reflection mirror 15 is raised and the exposure operation is possible. In FIG. 2A, the first drive lever 9 is rotated clockwise by the pulling force of the mirror lowering spring 16, and the small roller 9b is driven by the mirror driving plate cam 6a.
Abuts the bottom dead center. In this state, the movable reflection mirror 15
Is placed in the viewfinder observation state. On the other hand, the second drive lever 10 has a small roller 10b which is a plate cam 6 for shutter charging.
By rotating counterclockwise by contacting the top dead center b, the shutter charge completed state is maintained.

Here, when the cam drive gear 6 rotates in the direction of the arrow by the release operation, the plate cams 6a and 6b cause the levers 9 and 1 to rotate.
0,11,12 respectively rotate in the direction of the arrow, and as a result, the second
The state shown in FIG. Here, the small roller 9b is in contact with the top dead center of the mirror driving plate cam 6a, and in this state, the movable reflection mirror 15 is rising against the elasticity of the mirror descending spring 16, and is ready for photographing. ing. On the other hand, the second drive lever 10 is rotated clockwise by the tension of the spring 18, and the small roller 10b is in contact with the bottom dead center of the shutter charging plate cam 6b. In this state, the shutter 13 is in a running state. When the shutter is operated and the cam drive gear 6 is further rotated in the direction of the arrow after the completion of the travel of the shutter blades, as shown in FIG.
Each of the levers 9, 10, 11, and 12 is turned in the direction of the arrow by b, and as a result, the shutter 13 is charged and the movable reflecting mirror 15 is moved down to the state shown in FIG. 2A.

FIG. 3 is a view showing the details of the conductive contact piece 7 and the substrate 8 attached to the cam drive gear 6. On the substrate 8, there is provided an annular conductive pattern 8a at the center, a partially arcuate conductive pattern 8b around the conductive pattern 8a, and a conductive pattern 8c having conductive terminals extending in the radial direction at regular angles. Each conduction pattern is guided to control means (CPU) as shown in FIG. The tip of the conductive piece 7 is 2
Each of the tips is slid in contact with each of the conductive patterns on the substrate 8.
Is in contact with The other end 7b of the conductive contact piece 7 is
When the shutter charge is completed, it comes into contact with the conduction pattern 8b,
When the movable reflecting mirror 15 is completely lifted, the contact with the pattern 8b is cut off.
During the charging, the conductive pattern 8c is brought into contact with the conductive pattern 8c at regular angles. FIG. 3A shows a viewfinder observation state before the release, and the conductive patterns 8a and 8b are in a conductive state by the conductive contact piece 7. FIG. FIG. 3B shows when the movable reflecting mirror 15 is raised and the exposure operation is possible.

FIG. 4 shows a conductive contact piece mounted on the gear 28.
FIG. 3 shows details of a substrate 29 and a substrate 30. The tip of the conductive contact piece 29 is also divided into two forks, and each tip 29a,
29b is in contact sliding with each conductive pattern 30a, 30b on the substrate 30. That is, one end portion 29a is always in contact with the annular conductive pattern 30a at the center, and the other end portion 29b
Are provided so as to come into contact with the terminals of the conductive pattern 30b, which is provided around the conductive pattern 30a and has conductive terminals extending in the radial direction at a predetermined angle.
The conduction patterns 30a, 30b are guided to a control means (CPU) as shown in FIG.

The control means 33 in the present embodiment shown in FIG.
U, the conductive contact piece 7 and the conductive pattern 8a,
8b, a charge completion switch SW ₁ , the conductive contact 7
Mirror speed detection switch S consisting of and conductive patterns 8a and 8c
W ₃ and the respective opening / closing signals of the film winding speed detection switch SW _{2 comprising} the conductive contact piece 29 and the conduction patterns 30 a and 30 b are inputted, and the control means 33 controls the energization of the motor 1 and the motor 20. Control signals to the transistors 35 and 36 to be output.
When the switches 5 and 36 are turned on, current is supplied from the power supply battery 34 to the motors 1 and 20. Also, the control means 33 comprising this CPU
Performs all sequence control of the camera in addition to the above control.

Next, the operation of the camera according to the present embodiment thus configured will be described. In the finder observation state shown in FIG. 1, when a release signal is input to the control means 33 by a release operation, the control means 33 rotates the rotating shaft of the motor 1 clockwise. As a result, the output gear 2, the gears 3, 4, 5, and 6 rotate in the directions of the arrows, respectively. As a result, the shutter 13 is released from holding the charge completed state, and is ready to run, and the movable reflection mirror 15 is raised. Then, at the time when the mirror has been raised by the rotation of the cam drive gear 6, the conductive pattern 8b between the conductive contact piece 7 and the substrate 8 is non-conductive (see FIG. 3 (B)).
Then, the control means 33 stops the motor 1.

Next, exposure is performed by the operation of the shutter 13, and
After the end of the exposure operation, the control means 33 rotates the motor 1 clockwise again. As a result, output gear 2, gear 3, 4,
5 and 6 rotate in the directions of the arrows, the movable reflecting mirror 15 descends, and the charging operation of the shutter 13 is started. Then, at the same time, the conductive contact piece 7 slides on the substrate 8 by the rotation of the gear 6, so that the conductive patterns 8a and 8c repeat the conductive state and the non-conductive state, thereby detecting the operation speed when the mirror is lowered. You. That is, the control means 33 detects the rotation speed of the motor 1 based on the rotation speed of the gear 6. Here, when the rotation speed of the motor 1 is higher than a predetermined value because the performance of the battery 34 is sufficient, the control means 33 rotates the rotation shaft of the film winding motor 20 clockwise. Then, the output gear 21, the gears 22, 23, 24, 25, 26a and the spool 26 rotate in the directions of the arrows, respectively. As a result, the film 31 is wound around the spool 26, and the driven sprocket shaft 27 rotates in the direction of the arrow according to the running of the film 31.
The gear 28 rotates in the direction of the arrow due to the rotation of the driven sprocket shaft 27, and the conductive patterns 29a and 30b are turned on and off according to the movement of the film 31 as the conductive contact piece 29 slides on the substrate 30. Is repeated. Thereby, the control means 33 detects the feeding state of the film 31. Then, the conduction pattern 30
When the number of pulse signals corresponding to the change of conduction and non-conduction between a and 30b reaches the number corresponding to one frame of the film, the control means 33 stops the rotation of the motor 20 and completes the film winding. When the charging of the shutter 13 by the rotation of the motor 1 is completed, the conductive pattern 7a
The control means 33 stops the rotation of the motor 1 by making the and 8b conductive. When the motors 1 and 20 are stopped, a series of photographing operations for one frame are completed, and the photographing operation for the next frame is enabled.

Next, the operation when the power supply battery 34 has deteriorated or when the battery performance has deteriorated due to a decrease in the use environment temperature will be described. In this case, both motors are driven sequentially. Then, when the continuous shooting is performed, once the driving is switched to the sequential driving, the sequential driving is maintained. Here, the same operation as described above is performed from the release operation to the exposure operation by the operation of the shutter 13. After the exposure operation, the control means 33 rotates the motor 1 clockwise again, whereby the movable reflecting mirror 15 is lowered and the shutter 13 starts charging. Then, at the same time the control unit 33 detects the rotational speed of the motor 1 in accordance with the rotation of the gear 6, i.e., the lowering speed of the mirror 15 by the mirror velocity detection switch SW _3. Where motor 1
If the rotation speed of the motor 1 is lower than the predetermined value, the control means 33 continues the rotation of the motor 1 as it is, and continues charging the shutter. Then, when the charging of the shutter 13 is completed, the conductive patterns 8a and 8b of the substrate 8 are turned on by the conductive contact piece 7, so that the control means 33 stops the rotation of the motor 1. Then, subsequently, the control means 33 rotates the motor 20 clockwise to wind the film 31 around the spool 26. Then, conduction between the conduction patterns 30a and 30b of the substrate 30,
When the pulse signal due to the non-conduction change reaches a number corresponding to one frame of the film, the control means 33 stops the rotation of the motor 20, completes the film winding, and completes a series of photographing operations of one frame. I do.

FIG. 7 is a flowchart showing the shutter charging operation and the film winding operation. That is,
When the exposure is completed, the motor 1 is turned on, and then the switch
SW ₃ is checked, this timer 1 set of predetermined rotational speed in that the "Y" units of the motor 1 time starts after being reset. Here, the mirror speed detection switch SW ₃ is checked again, and then the timer 1
It is checked whether the operating speed at the time of lowering the mirror, that is, the rotation speed of the motor 1 is higher than the predetermined speed set in the above. Then, if it is late, sequential driving is performed in which only the rotation of the motor 1 is continued. Then the charge completion switch SW ₁ is checked whether it is turned on, the motor 1 as the charge if I is turned on has been completed is turned off. Then, the motor 20 for the upper film strip is turned on is the winding is started in the film, whether film winding speed detecting switch SW ₂ is operating is checked, from the switch SW ₂ if I operate The number of emitted pulses is counted, and when this reaches a predetermined value, the motor 20 is turned off assuming that one frame of film has been wound up, and the operation is terminated.

On the other hand, when the rotation speed of the motor 1 is detected, if the rotation speed is high, the film winding motor 20 is turned on to start simultaneous driving. And whether film winding speed detecting switch SW ₂ is operating is checked, if I operate counting the number of pulses generated from the switch SW ₂ is performed, if it reaches a predetermined value, the film one The motor 20 is turned off as the frame has been wound. Then the charge completion switch SW ₁ is a check whether it is turned on is performed, the motor 1 as the shutter Church was also complete when being turned on in operation is turned off to end. Incidentally, when the motor 20 is subsequently turned on the film winding speed detecting switch SW ₂ is checked, if it is not running, it is checked charge completion switch SW _1, wherein When this is not turned on, the motor 1 is turned off, and if not turned on again, switch SW ₂
Is checked.

Thus, in this flow compares the width of the pulses generated by the on-off operation of the timer 1 and the mirror velocity detecting switch SW _3, to determine whether to sequentially driven simultaneously drives the motor 1 and the motor 20 I have.

Further, the operation speed at the time of descent of the movable reflecting mirror 15 in the camera of the embodiment has a mirrored speed detecting switch SW ₃ to detect a rotational speed of the motor 1, which ascent of the movable reflective mirror 15 May be detected as the rotation speed of the motor 1.

Next, an embodiment of the present invention in this case will be described with reference to FIGS.
The figure will be described. In this embodiment, FIG.
Charge completion switch SW configured as shown in (B)
₄ and a mirror velocity detection switch SW ₅ is used to replace the charge completion switch SW ₁ and the mirror velocity detecting switch SW _3. Other configurations are the same as those in FIG.

The fifth switch SW ₄ and SW ₅ shown in the figures, the charge completed in a conductive pattern 38b that is formed over substantially 3/4 laps conductive pattern 38a and the surrounding annular formed in the center portion of the substrate 38 switch SW ₄ is formed, the mirror speed detection switch SW ₅ with a conductive pattern 38c and the pattern 38a formed on the comb-tooth shape in the radial direction in the remaining 1/4 laps portion is constituted. Each of these conduction patterns is led to control means (not shown). One end 7a of the conductive contact piece 7 whose tip is divided into two forks and slides in contact with the substrate 38 is always in contact with the pattern 38a when the gear 6 rotates. The other end 7b of the conductive contact piece 7 is provided so that the movable reflection mirror 15 comes into contact with the pattern 38b when the ascent is completed, and the contact with the pattern 38b is completed when the shutter charge is completed. It is provided so as to be in contact with the pattern 38c at every fixed angle during the ascent of 15. FIG. 5 (A) shows a viewfinder observation state before the release, and FIG. 5 (B) shows a time when the movable reflecting mirror 15 is raised and an exposure operation is possible. Further, the circuit configuration of the switch motor according to the present embodiment is the same as that of the above-described embodiment, and the description thereof will be omitted.

Next, the operation will be described. In the viewfinder observation state shown in FIG. 1, when a release signal is input to the control means by the release operation, the control means rotates the rotating shaft of the motor 1 clockwise. As a result, output gear 2, gear 3,
4, 5, and 6 respectively rotate in the direction of the arrow. As a result, the shutter 13 is released from the holding of the charge completion state, becomes a runnable state, and the movable reflection mirror 15 starts rising. At the same time, the contact pieces 7 slide on the substrate 38 in response to the rotation of the gear 6, so that the conductive patterns 38a and 38c repeat the conductive state and the non-conductive state. Thereby, the control means detects the rotation state of the motor 1 based on the rotation speed of the gear 6. Here, the control means determines whether the rotation speed of the motor 1 is higher or lower than a predetermined value due to the effect of the battery performance, and holds the result. On the other hand, the control means stops the motor 1 when the conductive patterns 38a and 38b of the substrate 38 become conductive at the time when the movable reflecting mirror 15 has completed ascending.

Next, after the exposure operation by the operation of the shutter 13 is completed, the control means operates the driving sequence of the motor 1 and the motor 20 based on the rotation speed information of the motor 1 detected and determined while the movable reflecting mirror 15 is moving up. Here, when the rotation speed of the motor 1 is higher than a predetermined value due to sufficient battery performance, the control means rotates the motor 1 and the motor 20 clockwise almost simultaneously, and the lowering of the movable reflection mirror 15 and the shutter 13 The charging and winding of the film 31 are started. Then, the control means when the signal generated by the film winding speed detecting switch SW ₂ in response to movement of the analogously to Example film 31 becomes the number corresponding to the film one frame stop the rotation of the motor 20 And complete the film winding. On the other hand, when the charging of the shutter 13 is completed by the rotation of the motor 1, the conduction patterns 38 a and 38 b on the substrate 38 become non-conductive, so that the control means stops the rotation of the motor 1. When both motors stop, a series of shooting operations for one frame are completed, and a shooting operation for the next frame is enabled.

Next, an operation in the case where the speed of the movable reflecting mirror 15 during ascending, that is, the rotation speed of the motor 1 is lower than a predetermined value due to the deterioration of the battery and the deterioration of the battery performance due to the decrease in the use environment temperature will be described. After the exposure operation is completed by the operation of the shutter 13, the control means starts the lowering of the movable reflecting mirror 15 and the charging of the shutter 13 by rotating the motor 1 clockwise. Then, when the charging of the shutter 13 is completed, the conduction patterns 38a and 38b on the substrate 38 are turned off, so that the control means stops the rotation of the motor 1,
Subsequently, the motor 20 is rotated clockwise to start winding the film 31. Then, when the signal generated by the film winding speed detecting switch SW ₂ is turned to the number corresponding to the film one frame, the control means stops the rotation of the motor 20 to complete the film winding, a series of one frame The minute shooting operation is completed. In the case of continuous shooting, shooting is continued by this sequential drive. As described above, in the present invention, the photographing operation after the switching to the sequential driving is performed by the sequential driving.

FIG. 8 shows the above in a flowchart. In this flow, it is determined whether to set the low speed flag by detecting the speed at the time of mirror up,
For simultaneous drive and sequential drive branch of both motors after exposure operation,
Use this flag.

In the embodiment shown in FIGS. 5 and 8, the sequence of both motors for performing shutter charging and film winding can be determined while the movable reflecting mirror is being raised. Since both motors can be started immediately, the driving speed of the camera can be further increased, the number of shots per second can be increased, and when the battery performance is reduced, only the motor 1 is started after the exposure is completed. The movable reflecting mirror can be quickly lowered, and the effect of keeping the finder observation image disappearing time short can be obtained.

In the above embodiment, when the battery performance is sufficient, the motor 1 and the motor 20 are started almost simultaneously after the end of the exposure operation. However, in order to prevent an increase in the starting current of the motors, the starting timings of both motors are slightly adjusted. Of course, it may be shifted.

[Effects of the Invention] As described above, according to the present invention, the film winding operation, the shutter charging and the mirror driving operation are each performed by a dedicated motor, and switching between simultaneous driving and sequential driving of both motors is performed. In motor-driven cameras,
Since the detection for this switching is performed based on the rotation speed of the shutter charging motor or the operating speed of the mirror, fluctuations at the time of switching due to differences in environmental conditions are unlikely to occur, and stable switching operation is performed. That can be done.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a motor-driven camera according to an embodiment of the present invention. FIGS. 2A and 2B are diagrams of a movable reflecting mirror driving plate cam and a shutter charging plate cam. FIGS. 3 (A) and 3 (B) are enlarged plan views showing the operation modes of a shutter charge completion switch and a mirror speed detection switch, respectively. FIG. 4 is a diagram for detecting a film winding speed. FIGS. 5A and 5B are enlarged plan views showing operation modes of a shutter charge completion switch and a mirror speed detection switch used in another embodiment of the present invention, respectively. FIG. 7 is a schematic diagram showing the relationship between a motor, a shutter charge completion switch, a mirror speed detection switch, a film winding speed detection switch, and control means. FIG. 7 shows the camera of the first embodiment. 8 is a flowchart showing the flow after the end of exposure in FIG. 8, FIG. 8 is a flowchart showing the operation of the camera of another embodiment using the switch of FIG. 5, and FIG. 9 shows the configuration of a conventional motor-driven camera. It is a block diagram. 1... Second motor 20... First motor SW ₁ , SW ₄ ... Charge completion switch SW ₂ ... Film winding speed detection switch SW ₃ , SW ₅ ... Mirror speed detection switch (detection means) 33 …… CPU (control means, judgment means)

Claims (2)

(57) [Claims] 1. A motor-driven camera comprising a first motor for winding a film and a second motor for charging a shutter, comprising: means for detecting a rotation speed of the second motor; After the operation is completed, the second motor is driven. During the driving, if the output of the detection means is faster than a predetermined value, the first motor is driven simultaneously. And control means for starting driving the first motor after the driving of the second motor is completed. 2. A motor-driven camera comprising a first motor for winding a film and a second motor for driving a mirror and charging a shutter, means for detecting an operation speed of a mirror, and this detecting means. Means for determining whether or not the operation speed detected is higher than a predetermined speed; and, when the determination means determines that the operation speed is higher than the predetermined speed, simultaneously driving the two motors simultaneously. Control means for performing drive control and performing sequential drive control for sequentially driving the two motors when it is determined that the speed is lower than a predetermined speed.