JPH01210941A - Motor driven camera - Google Patents

Abstract

PURPOSE:To allow stable sequence operations by winding a film, charging a shutter and driving a mirror by using exclusive motors, detecting motor rotating speed and discriminating whether the motors are simultaneously driven or sequentially driven. CONSTITUTION:When an exposure operation is finished, a CPU 33 rotates the motor 1 once, and a movable reflecting mirror descends, and the shutter starts charging. At the same time, the CPU 33 detects the rotating speed of the motor 1, namely, the descending speed of the mirror, by a mirror speed detecting switch SW3. When the rotating speed of the motor 1 is slower than the specific value, the rotation is continued, and the shutter is continuously charged, and when the charging is completed, conduction patterns 8a and 8b become adjacent to each other, and the motor 1 is stopped. When a pulse signal generated by the conduction/nonconduction change of the conduction patterns 30a and 30b becomes the equivalent number to the one frame of the film, the motor 20 stops, and the film winding is completed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a motor-driven camera, and more particularly, to a camera in which film winding operation and shutter charging operation are performed by dedicated motors. [Technology] Recent cameras have become increasingly electric, and each camera operation, such as film winding, shutter charging, and mirror driving, is automatically performed by a built-in motor.

This motor-driven camera was invented in Japanese Patent Application Publication No. 5
As disclosed in Japanese Patent Publication No. 3-141615, a single motor built into a camera performs film winding operation and shutter charging operation at the same time, and Japanese Patent Application Laid-open No. 194433/1982 As shown, two reduction gear trains are provided for one motor built into the camera, and the reduction gear train can be selected by switching the rotation direction of the motor depending on the power battery condition and load condition. The film winding operation and the shutter charging operation are performed by separate motors, and as disclosed in Japanese Patent Application Laid-Open No. 60-254028, the film winding operation and the shutter charging operation are performed by independent motors. What has been done is already known.

By the way, when considered from the perspective of the energy required to drive each operating mechanism of a camera, the film winding operation and shutter charging operation require considerably more energy than the operations of other operating mechanisms. do. In particular, the film winding operation is greatly affected by temperature, and as the temperature decreases, the load increases. For example, at -20°C, the film hardens and the film winding load becomes 3 to 5 times that at room temperature.

Furthermore, as is well known, power batteries are also greatly affected by temperature.
Even if a battery has sufficient capacity and does not cause a predetermined voltage drop at room temperature, there is a phenomenon in which the predetermined voltage drops when used in a low-temperature environment.

On the other hand, in recent single-lens reflex cameras, the performance of the shutter has been improved, and there is a tendency for charge energy to increase in order to increase the shutter curtain speed in order to increase the maximum shutter speed.

Based on this point of view, it is more advantageous for motor-driven cameras to have a motor for film winding and a motor for charging the shutter, etc., and that both motors are powered by batteries. It is preferable that simultaneous driving (parallel driving) and sequential driving (serial time-series driving) be selected depending on the state of the load.

Recently, the one that responded to this demand was the 62-1 Utility Model.
This is proposed by Publication No. 2953:3. That is, in the electric film feeding device of this camera, as shown in FIG. 9, when the shutter operates and exposure is completed, the drive start signal S3 becomes H level.

Along with this, the drive control signal S1 from the control circuit 105
becomes H level, and the voltage of the power supply battery 103 increases to the drive circuit 1.
04 to both a shutter driving motor 101 and a film feeding motor 102.

Then, shutter charging and the like are started by rotating the shutter driving motor 101, and film winding is started by rotating the film feeding driving motor 102. During this film winding, the film feeding speed is detected by the film feeding speed detection circuit 10.
6, and if the detected speed is equal to or higher than the set reference value, the speed detection signal S2 goes to the H level, and the drive control signal S1 continues to go to the H level by the operation of the control circuit 105. Therefore, in this case, both motors 101 and 102 are controlled to rotate simultaneously, that is, in parallel, and the film is wound and the shutter is charged.

On the other hand, when the film feeding speed is not higher than the set reference value, in other words, when the film feeding speed is slow, the speed detection signal S2 becomes L level, and the control circuit 1
The drive control signal S1, which is the output of 05, becomes L level.

Then, the drive circuit 104 receives the H signal from the drive start signal S3.
Both motors 101 mentioned above until then with a level signal.

102 is temporarily driven in parallel.

Since only the shutter driving motor 101 is driven, the shutter, mirror, and aperture mechanisms are only charged and driven by the shutter driving motor 101. When this driving is completed, the film feeding drive motor 102 is driven again, the film is wound up, a series of driving operations are completed, and the film is returned to the initial state to prepare for the next shirt release.

[Problems to be Solved by the Invention] However, when the conventional technical means disclosed in the above-mentioned Japanese Utility Model Application Publication No. Sho 62-129533 is used, the following problems occur. In other words, in the case of quick-shot shooting where multiple frames are shot continuously, if the battery voltage drops around the threshold level for switching between simultaneous drive and sequential drive, the first frame will be driven sequentially and the next frame will be driven sequentially due to load fluctuations. One frame is driven simultaneously, and the next frame is driven sequentially. When such an operation occurs, even when the user is shooting under exactly the same conditions, the operating sequence becomes faster or slower, leading the user to suspect that something is wrong with the camera, or This creates anxiety as to whether or not the photographing is being performed normally.

Therefore, an object of the present invention is to solve the above-mentioned problems by having a motor exclusively for film winding and a motor exclusively for shutter charging, and after the shutter operation is completed, driving the motor exclusively for shutter charging and detecting its rotation speed. When the capacity of the power supply battery is sufficient and the load is small, the system automatically switches to simultaneous drive, and when the battery performance decreases and the load increases, it automatically switches to sequential drive. An object of the present invention is to provide a motor-driven camera in which sequential driving is maintained after switching.

Another object of the present invention is to have a motor dedicated to film winding and a motor dedicated to shutter charge and mirror drive, detect the operating speed when the mirror is raised or lowered, and compare this operating speed with a predetermined speed. An object of the present invention is to provide a motor-driven camera in which it is determined whether the two motors are driven simultaneously or sequentially.

[Means and effects for solving the problems] In order to solve the above problems, the present invention provides a motor drive including a first motor that winds the film and a second motor that performs shutter charging, etc. In the camera, a means for detecting the rotational speed of the second motor; and a means for driving the second motor after the shutter operation is completed; 1
and a control means for driving the first motor at the same time, and starting to drive the first motor after the second motor has finished driving if the speed is slower than a predetermined value, and first drives the shutter charging motor. , the rotational speed of this motor is compared with a predetermined speed to control simultaneous driving or sequential driving of both motors, and also when the mirror is raised or lowered when the mirror is driven by the shutter charge motor. The operating speed of the shutter charging motor is detected and this is used as the rotational speed of the shutter charging motor.

[Example] The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows an example in which the present invention is applied to a single-lens reflex camera that employs a longitudinal-travel focal-brain shutter. The light transmitted through the photographic lens (not shown) attached to the lens mount 41 of the camera body enters the camera body, and is reflected by the movable reflection mirror 15 installed diagonally at an angle of 45 degrees on the photographing optical axis 0. It is reflected upward and transmitted and diffused to the focusing screen 42. The optical image on the focusing screen 42 is observed as an erect image in the finder through a pentaprism 43 and an 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 consisting of a pinion gear is fixed to its rotating shaft. The transmission gears 3 and 4 are composed of stage gears with different diameters,
The rotational force of the output gear 2 is decelerated and transmitted to the intermediate gear 5.

A cam drive gear 6 meshing with this gear 5 includes a plate cam 6a for driving a mirror and a plate cam 6 for shutter charging.
b is integrally attached, and a conductive contact piece 7 that rotates and slides on the substrate 8 is attached to the lower surface thereof. A first drive lever 9 is disposed near the plate cam 6a so as to be rotatable about a support shaft 9a, and its arm end slides on the cam surface of the plate cam 6a for driving the mirror. Moving small roller 9
b is rotatably attached, and a small roller 9C is also rotatably attached to the end of the other arm. Further, a mirror drive lever 11 is provided near the movable reflecting mirror 15 so as to be rotatable about a support shaft 11a, and a bin llb that comes into contact with the small roller 9C is fixed to the lower end of the lever 11. The movable reflection mirror 15 is obliquely installed on the photographing optical axis 0 so as to be able to rotate upward around a support shaft 15g, and is moved by a mirror lowering spring 16 stretched between a fixed member (not shown). The pin is biased downward and is in contact with the mirror positioning bin 17 in the viewfinder observation state. When the mirror drive lever 11 rotates clockwise around the support shaft 11a, its upper end 11C pushes up the bin 15b fixed on the upper side of the movable reflective mirror 15, thereby pushing up the mirror 15. It is supposed to rise.

Further, a second drive lever 10 is provided near the plate cam 6b so as to be rotatable around a support shaft 10a, and at one arm end of the lever 10, the plate cam 6 for charging the shutter is provided.
A small roller 10b that slides on the cam surface of b is rotatably attached, and a small roller 10c is also rotatably attached to the end of the other arm. A shutter charge lever 12 is provided near the mirror 15 so as to be rotatable about a support shaft 12a, and a bin 12b that comes into contact with the small roller 10c is fixed to the lower end of the shutter charge lever 12. A connecting bottle 12c is also fixedly planted at the upper end of this lever 12. Furthermore, a weak spring 18 is stretched between the lever 12 and a stationary member (not shown), giving it the ability to rotate counterclockwise.

A known vertically running focal-brain shutter 13 is disposed behind the movable reflective mirror 15, and when the lever 12 is rotated clockwise against the elasticity of the spring 18, the bin 12c is moved. Shutter charge member 14
This pushes up the bottle 14a, which is fixedly planted in the bottle 14a, thereby charging the shutter.

On the other hand, a first motor 20 for winding the film is disposed inside the film take-up spool 26, and an output gear consisting of a pinion gear is attached to the rotation shaft of the first motor 20 for winding the film.
21 is fixed. The transmission gears 22, 23, and 24 are each composed of stage gears with different diameters, and transmit the rotation of the output gear 21 to the intermediate gear 25 by decelerating the rotation.

This intermediate gear 25 meshes with a drive gear 26a provided on the spool 26. Further, a plurality of locking claws 26b are provided on the outer periphery of the spool 26, and the perforations of the film 31 are caught by the rotation of the spool 26 to wind up the film 31. The driven sprocket shaft 27 has well-known engagement claws 27a and 27b that engage with the perforations of the film 31, and a gear 27c at its upper end, and rotates in synchronization with the movement of the film 31. A conductive contact piece 29 that rotates and slides on the substrate 30 is integrally attached to the lower surface of the gear 28 that meshes with the gear 27c.

FIG. 2 is an enlarged view showing the operation of plate cams 6a and 6b integrally attached to the cam drive gear 6,
FIG. 2(A) shows the finder observation state before release, and FIG. 2(B) shows the state when the movable reflection mirror 15 is raised and exposure operation is possible.

In FIG. 2(A), the first drive lever 9 is rotating clockwise due to the tension of the mirror lowering spring 16, and the small roller 9b is in contact with the bottom dead center of the plate cam 6a for driving the mirror. There is. In this state, the movable reflection mirror 15 is placed in a viewfinder observation state.

On the other hand, the second drive lever 10 rotates counterclockwise due to the small roller 10b contacting the top dead center of the plate cam 6b for shutter charging, thereby maintaining the shutter charging completed state.

Here, when the cam drive gear 6 rotates in the direction of the arrow due to the release operation, the plate cams 6a and 6b rotate the levers 9.10 and 11.12 in the direction of the arrow, respectively, and as a result, as shown in FIG. ). Here small roller 9
b is in contact with the top dead center of the mirror drive plate cam 6a,
In this state, the movable reflective mirror 15 is raised against the elasticity of the mirror lowering spring 16, and is ready for photographing.

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 plate cam 6b for shutter charging. In this state, the shutter 13 is placed in a travelable state. At this point, the shutter is activated, and after the shutter blade has completed its travel, the cam drive gear 6 further rotates in the direction of the arrow, as shown in Fig. 2 (B
), each lever 9. is moved by the plate cams 6a, 5b.
10°, 11, and 12 rotate in the directions of arrows, and as a result, the shutter 13 is charged and the movable reflection mirror 1
5 is performed, and the state shown in FIG. 11S2 (A) is reached.

FIG. 3 is a diagram showing details of the conductive contact piece 7 and the board 8 attached to the cam drive gear 6. As shown in FIG.

On the substrate 8, there are provided an annular conductive pattern 8a in 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 led to a control means (CPU) as shown in FIG. The tip of the conductive contact piece 7 is divided into two parts, and each tip slides into contact with each conductive pattern on the board 8, and one tip 7a is connected to the rotation of the gear 6. On the other hand, it is always in contact with the conductive pattern 8a. Further, the other tip 7b of the conductive contact piece 7 comes into contact with the conductive pattern 8b when the shutter charging is completed, and the contact with the pattern 8b is broken when the movable reflective mirror 15 completes rising, and when the movable reflective mirror 15 is lowered. While the shutter 13 is being charged, it comes into contact with the conductive pattern 8c at regular angle intervals.

FIG. 3(A) shows the viewfinder observation state before release, and the conductive patterns 8a and 8b are in a conductive state by the conductive contact piece 7. FIG. 3(B) shows a state in which the movable reflection mirror 15 is raised and exposure operation is possible.

FIG. 4 is a diagram showing details of the conductive contact piece 29 and the board 30 attached to the gear 28.

This conductive contact piece 29 is also divided into two at its tip,
The respective tips 29a and 29b are in sliding contact with the respective conductive patterns 30a and 30b on the substrate 30. That is, one tip 29a is in constant contact with the annular conductive pattern 30a in the center, and the other tip 29b is arranged around the conductive pattern 30a in the radial direction at regular angles. It is arranged so as to be in contact with the terminal of the conductive pattern 30b having the extended conductive terminal. Further, the conductive patterns 30a and 30b are guided to a control means (CPU) as shown in FIG.

The control means 33 in this embodiment shown in FIG.
It is made of PU and is electrically connected to the charge completion switch SW1, which is made up of the conductive contact piece 7 and the conductive patterns 8a and 8b, and the mirror speed detection switch SW3 and the conductive contact piece 29, which is made up of the conductive contact piece 7 and the conductive patterns 8a and 8c. Pattern 30a.

Film winding speed detection switch SW2 consisting of 30b
At the same time, the control means 33 outputs a control signal to the transistor 35.36 that controls the energization of the motor 1 and the motor 20, and the transistor 35.36 is turned on. When this happens, current is supplied from the power supply battery 34 to the motors 1 and 20. In addition to the above-mentioned control, the control means 33 consisting of the CPU performs all sequence control of the camera.

Next, the operation of the camera of this embodiment configured as described above will be explained. In the finder observation state shown in Figure 1,
When a release signal is input to the control means 33 by the release operation, the control means 33 rotates the rotation shaft of the motor 1 clockwise. As a result, output gear 2, gear 3.4,
5 and 6 rotate in the directions of the arrows. As a result, the shutter 13 is released from the charged state and becomes ready for travel, and the movable reflective mirror 15 rises.

Then, at the point when the mirror has completed rising due to the rotation of the cam drive gear 6, the conductive contact piece 7 and the conductive pattern 8b of the substrate 8 become non-conductive (see FIG. 3 (13)), so that the control means 33 stops the motor 1. .

Next, exposure is performed by operating the shutter 13,
After the exposure operation is completed, the control means 33 rotates the motor 1 clockwise again. As a result, the output gear 2 and the gears 3.4 and 5.6 rotate in the directions of the arrows, the movable reflection mirror 15 descends, and the charging operation of the shutter 13 is started. At the same time, the conductive contact piece 7 slides on the substrate 8 due to 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 operating speed when the mirror is lowered. Ru.

That is, the control means 33 detects the rotational speed of the motor 1 based on the rotational speed of the gear 6. If the rotation speed of the motor 1 is faster than a predetermined value because the performance of the battery 34 is sufficient, the control means 33 rotates the rotation shaft of the motor 20 for film winding clockwise. Then, the output gear 21,
The gear 22, 23, 24, 25, 26a and the spool 26 each rotate in the direction of the arrow. As a result, the film 31 is wound onto the spool 26, and the driven sprocket shaft 27 rotates in the direction of the arrow as the film 31 travels. The gear 28 rotates in the direction of the arrow due to the rotation of the driven sprocket shaft 27, and the conductive contact piece 29 contacts the board 3.
0, the conductive patterns 30a and 30b repeat a conductive state and a non-conductive state according to the movement of the film 31. Thereby, the control means 33 detects the feeding state of the film 31. Then, when the number of pulse signals due to changes in conduction and non-conduction between the conduction patterns 30a and 30b reaches a number corresponding to the film uniformity, the control means 33 stops the rotation of the motor 20 and completes the film winding. Furthermore, when the charging of the shutter 13 due to the rotation of the motor 1 is completed, the conductive contact piece 7 brings the conductive patterns 8a and 8b of the substrate 8 into a conductive state, so that the control means 33 stops the rotation of the motor 1. Then, when both motors 1.20 stop, a series of uniform photographic operations are completed, and the next frame can be photographed.

Next, the operation when the power supply battery 34 has deteriorated or when the battery performance has deteriorated due to a drop in the operating environment temperature will be described. In this case, both motors are driven sequentially. When continuous shooting is performed, once the drive is switched to sequential drive, the sequential drive is maintained. Here, the same operations as described above are performed from the release operation to the exposure operation by operating the shutter 13. After the exposure operation is completed, the control means 33 rotates the motor 1 clockwise again, so that the movable reflection mirror 15 starts lowering and the shutter 13 starts charging. At the same time, the control means 33 detects the rotational speed of the motor 1, that is, the downward speed of the mirror 15, according to the rotation of the gear 6, using the mirror speed detection switch SW3.

Here, if the rotational speed of the motor 1 is slower than the predetermined value, the control means 33 continues the rotation of the motor 1 and continues charging the shutter. When charging of the shutter 13 is completed, the conductive patterns 8a and 8b of the substrate 8 are brought into conduction by the conductive contact piece 7, so that the control means 33
stops the rotation of motor 1.

Subsequently, the control means 33 rotates the motor 20 clockwise to wind the film 31 onto the spool 26. And the conductive patterns 30a and 30 of the substrate 30
The pulse signal due to the change in conduction and non-conduction of b
When the number corresponding to the uniform number has been reached, the control means 33 stops the rotation of the motor 20, completes the winding of the film, and completes the series of photographing operations for the uniform number.

FIG. 7 is a flowchart showing the shutter charging operation and film winding operation. That is, when the exposure is completed, motor 1 is turned on, and then switch S is turned on.
Wa is checked, and if it is "Y", the timer 1 is set to a predetermined rotation speed within the unit time of the motor 1.
It will start after being reset. Here, the mirror speed detection switch SW3 is checked again, and then it is checked whether the operating speed when the mirror is lowered, that is, the rotational speed of the motor 1 is faster than the predetermined speed set in the timer 1. If it is slow, then only the rotation of the motor 1 continues, resulting in sequential drive. Next, it is checked whether or not the charge completion switch SW1 is turned on. If it is turned on, it is assumed that charging is completed and the motor 1 is turned on.
is turned off. Then, the film winding motor 20 is turned on to start film winding, and it is checked whether or not the film winding speed detection switch SW2 is operating, and if it is operating, a signal is issued from the switch SW2. The number of pulses is counted, and when it reaches a predetermined value, the motor 20 assumes that a uniform amount of film has been wound.
Turn off and end the operation.

On the other hand, when the rotational speed of the motor 1 is detected, if it is fast, the film winding motor 20 is turned on and simultaneously driven. Then, it is checked whether or not the film winding speed detection switch SW2 is operating. If it is operating, the number of pulses emitted from the switch SW2 is counted, and when this reaches a predetermined value, the film is loaded for one frame. The motor 20 is turned off as if the winding had been completed. Next, a check is made to see if the charge completion switch SW1 has been turned on, and if it has been turned on, it is assumed that shutter charging has been completed, and the motor is turned off and the operation ends. When the motor 20 is turned on and the film winding speed detection switch SW2 is checked, if it is not operating, the charge completion switch SW is checked, and if it is on, the motor is turned off. If the switch SW2 is not turned on, the switch SW2 is checked again.

In this manner, in this flow, the pulse widths generated by the on/off operations of the timer 1 and the mirror speed detection switch SW3 are compared to determine whether the motor and the motor 20 are to be driven simultaneously or sequentially.

Furthermore, in the camera of the above embodiment, the mirror speed detection switch SW3 is configured to detect the operating speed when the movable reflective mirror 15 is lowered as the rotational speed of the motor 1; The operating speed may be detected as the rotational speed of the motor 1.

Next, an embodiment of the present invention in this case will be described with reference to FIGS. 5 and 8. In this example, FIGS.
) A charging completion switch SW configured as shown in
i, and the mirror speed detection switch SW5 are connected to the charge completion switch SW1 and the mirror speed detection switch SW3.
It is used in place of .

The rest of the structure is the same as that shown in FIG. 1 above.

The switches SW4 and SW5 shown in FIG.
A charge completion switch SW4 is constituted by an annular conductive pattern 38a formed in the upper center and a conductive pattern 38b formed around it over approximately 3/4th of the circumference, and a comb is formed in the remaining 174 circumferences in the radial direction. The tooth-shaped conductive pattern 38c and the pattern 38a constitute a mirror speed detection switch SW5. Each of these conduction patterns is led to a control means (not shown). One tip 7a of the conductive contact piece 7 whose tip is divided into two and sliding in contact with the substrate 38 is constantly in contact with the pattern 38a as the gear 6 rotates. The other tip 7b of the conductive contact piece 7 is provided so that it comes into contact with the pattern 38b when the movable reflection mirror 15 completes its ascent, and ends contact with the pattern 38b when the shutter charging is completed. The pattern 38c is provided so as to come into contact with the pattern 38c at regular angle intervals while the pattern 15 is rising. FIG. 5(A) shows the finder observation state before release, and FIG. 5(B) shows the state when the movable reflection mirror 15 is raised and exposure operation is possible. Further, since the circuit configuration of the switch motor according to this embodiment is the same as that of the above embodiment, the explanation 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 a release operation, the control means rotates the rotation shaft of the motor 1 clockwise. As a result, output gear 2, gear 3
．． 4, 5, and 6 rotate in the direction of the arrow, respectively. As a result, the shutter 13 is released from the charged state and becomes ready to travel, and the movable reflective mirror 15 starts to rise. At the same time, the contact piece 7 slides on the substrate 38 in accordance with the rotation of the gear 6, so that the conductive patterns 38a and 38c repeat a conductive state and a non-conductive state. Thereby, the control means detects the rotational state of the motor l based on the rotational speed of the gear 6. Here, the control means determines whether the rotational speed of the motor 1 is faster or slower than a predetermined value due to the influence of battery performance, and holds the result. On the other hand, when the movable reflective mirror 15 completes its ascent, the conductive patterns 38a and 38b of the substrate 38 are brought into conduction, so that the control means stops the motor 1.

Next, after the exposure operation is completed by operating the shutter 13, the control means controls the rotation speed of the motor 1 and the motor 2 based on the rotational speed information of the motor 1 detected and determined while the movable reflection mirror 15 is rising.
0 drive sequence is operated. Here, if the rotational speed of the motor 1 is faster than a predetermined value because the battery performance is sufficient, the control means rotates the motor 1 and the motor 20 clockwise almost simultaneously, lowering the movable reflective mirror 15 and opening the shutter 13. Charging and winding of the film 31 are started.

Then, as in the embodiment described above, the control means stops the rotation of the motor 20 when the signal generated from the film winding speed detection switch SW2 in response to the movement of the film 31 reaches a number corresponding to the film-equal division. , completes film winding. On the other hand, when the charging of the shutter 13 is completed due to the rotation of the motor 1, the conductive pattern 38 on the substrate 38
When a and 38b become non-conductive, the control means stops the rotation of the motor 1. When both motors stop, a series of evenly distributed photographic operations are completed, and the next frame can be photographed.

Next, an explanation will be given of the operation when the speed of the movable reflective mirror 15 during its ascent, that is, the rotational speed of the motor 1, is slower than a predetermined value because the battery performance has decreased due to deterioration of the battery or a drop in the operating environment temperature. After the exposure operation is completed by operating the shutter 13, the control means rotates the motor 1 clockwise to start lowering the movable reflective mirror 15 and charging the shutter 13. When charging of the shutter 13 is completed, the conductive patterns 38a and 38 on the substrate 38
b becomes non-conductive, the control means stops the rotation of the motor 1, continues to rotate the motor 20 clockwise, and starts winding the film 31. Then, when the signal generated from the film winding speed detection switch SW2 reaches a number corresponding to the number of equal parts of the film, the control means stops the rotation of the motor 20, completes the film winding, and divides the film into a series of equal parts. Complete the shooting operation. Further, in the case of continuous shooting, shooting is continued by this sequential drive. As described above, in the present invention, the photographing operation after switching to sequential drive is performed in sequential drive.

FIG. 8 shows a flowchart of the above.

In this flow, it is determined whether or not to set a low speed flag based on the speed detected when the mirror is raised, and this flag is used to branch between simultaneous driving and sequential driving of both motors after the exposure operation.

In the embodiments shown in FIGS. 5 and 8, the sequence of both motors for shutter charging and film winding can be determined while the movable reflecting mirror is rising, so if the battery performance is sufficient, the Since both motors can be started immediately, the camera can be driven faster and the number of frames taken per second can be increased.In addition, if the battery performance deteriorates, only motor 1 is started after the exposure is completed. The movable reflection mirror can be lowered quickly, and the disappearing time of the viewfinder image can be kept short.

In the above example, when the battery performance was sufficient, motor 1 and motor 20 were started almost simultaneously after the exposure operation was completed. However, in order to prevent an increase in the starting current of the motors, the starting timing of both motors was slightly changed. 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 operation, and the mirror driving operation are each performed by dedicated motors, and changes in battery performance and film winding negative (1: In a motor-driven camera that determines whether to drive both motors simultaneously or sequentially by detecting the rotational speed of the motors, once the state of i is switched to sequential drive, this is maintained. As a result, stable sequence operation is performed.Also, even with a small battery, it is possible to increase the number of films that can be shot without having to replace the battery.This reduces battery performance and increases the film winding load. The effect of increasing the number of films that can be photographed at low temperatures, which are increasing significantly, is tremendous.

As described above, according to the present invention, it is possible to provide a motor-driven camera that completely eliminates the drawbacks of this type of camera described above.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a motor-driven camera showing an embodiment of the present invention, and FIG. 2 (B) shows a plate cam for driving a movable reflective mirror and a plate cam for shutter charging. 3(A) and 3(B) are enlarged plan views showing the operating states of the shutter charge completion switch and mirror speed detection switch, respectively. FIG. 4 is an enlarged plan view showing the operating states of the shutter charge completion switch and the mirror speed detection switch. FIGS. 5(A) and 5(B) are enlarged plan views of the switch, and FIG. , a schematic diagram showing the relationship between the motor, the shutter charge completion switch, the mirror speed detection switch, the film winding speed detection switch, and the control means; FIG. 7 shows the flow after exposure is completed in the camera of the first embodiment; FIG. 8 is a flowchart showing the operation of another embodiment of the camera using the switch shown in FIG. 5, and FIG. 9 is a block diagram showing the configuration of a conventional motor-driven camera. 1... Second motor 20...
...First motor sw, sw4...Charging completion switch S
W2...Film winding speed detection switch SW
3. SW5...Mirror speed detection switch (detection means)

Claims (2)

[Claims] (1) In a motor-driven camera equipped with a first motor that winds the film and a second motor that charges the shutter, a means for detecting the rotational speed of the second motor, and a means for detecting the rotational speed of the second motor, , the second motor is driven, and during the drive, if the output of the detection means is faster than a predetermined value, the first motor is
A motor-driven camera comprising: control means for simultaneously driving the first motors and, if the speed is slower than a predetermined value, for starting to drive the first motor after the second motor has finished driving. (2) In a motor-driven camera equipped with a first motor that winds the film and a second motor that drives the mirror and charges the shutter, means for detecting the speed at which the mirror moves up and down; means for determining whether the operating speed detected by the detecting means is faster than a predetermined speed; and when the determining means determines that the operating speed is faster than the predetermined speed,
The present invention is characterized by comprising a control means that performs simultaneous drive control to drive both of the motors at the same time, and when it is determined that the speed is slower than a predetermined speed, performs sequential drive control to drive both of the motors sequentially. motor-driven camera.