JP2621045B2 - Camera with built-in motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a camera with a built-in motor that performs up / down of a mirror, shutter charge, winding and rewinding of a film by a plurality of motors.

2. Description of the Related Art In a camera in which a film is wound by a motor, there is a disadvantage that the film feeding amount is not constant due to fluctuations in a power supply condition, a film load condition, and the like, and a film interval varies. For this reason, the following has been proposed as a motor braking means.

(A) A film feed speed is detected by a pulse, a microcomputer calculates a film overrun amount based on the feed speed, and controls a motor stop position (for example, Japanese Patent Application Laid-Open No. No. 24123, JP-A-58-2
(B) No. 4124, JP-A-58-24125) (B) A cycle corresponding to the rotation speed of a pulse motor having a constant width is generated. When the motor is rotating rapidly, the duty ratio of the current flowing through the motor is small. When the motor is rotating at a low speed, the device is configured to feedback control the rotation of the motor so as to increase the duty ratio of the current supplied to the motor (Japanese Patent Application Laid-Open No. 60-123828). It shows the relationship of competence. From the figure, it is understood that the amount of driving force is increased by increasing the energizing time. Conventionally, when an actuator such as a solenoid is operated, constant energization has been performed irrespective of whether or not the actuator has been completely operated, variation in the operating load, and the like. Therefore, the energization time has to be made longer than necessary.

[Problems to be Solved by the Invention] By the way, in the case of the above-mentioned means (A), when the film feeding speed is high, it is necessary to stop the motor before feeding a predetermined amount of the film. When the load of the film increases later, there is a disadvantage that the film stops before the predetermined amount of the film is fed and the predetermined amount of the film cannot be fed. Further, in the case of the above-mentioned means (B), it is necessary to generate an extremely large number of pulses before feeding one frame of the film, and there is a disadvantage that the structure becomes very complicated. The present invention eliminates the above-mentioned drawbacks of the prior art, and enables a constant film feed regardless of the number of winding frames, without being affected by power supply conditions, film load, and the like. It is an object to provide a feeding device.

In the prior art, the actuator must be energized for an unnecessarily long time, so that the operation time of one sequence is prolonged, so that not only the frame speed cannot be increased but also the power saving design is violated. In view of the above, an object of the present invention is to provide an optimal energizing time to an actuator in order to solve such a problem.

[Means to solve the problem]

In order to solve the above problems, in the present invention, a film feeding motor for winding the film through a single drive system,
By controlling the supply of drive power, the feed motor is continuously driven in a first section from the start of film winding to a predetermined position, and the feed motor is kept constant in a second section from the predetermined position to completion of film winding. Drive control means for driving with a pulse having a duty ratio, detection means for detecting a film winding speed in a first section,
Changing means for changing the predetermined position in accordance with the film winding speed obtained by the detecting means.

〔Example〕

First, the function of the camera in the present embodiment will be described.
This camera is a fully automatic camera that can be automatically loaded, automatically wound, and rewound.
H, CL, and S can be selected from three feeding modes.

CH mode: Quick shooting mode of 3 frames or more per second CL mode: Continuous shooting mode of 2 frames or more per second S mode: Single mode that operates only for release.

The camera also incorporates an automatic focus adjustment (hereinafter, referred to as AF) function, in which focus detection is performed by focus detection means, and the lens distance ring is driven based on the result. The AF mode also has the following two modes.

AF-C mode: a release priority mode in which the shutter is operated when the release button is pressed even in an out-of-focus state.

AF-S mode: Focusing priority mode in which the shutter is not activated even if the release button is pressed unless focusing is achieved.

The drive timing of each motor is determined by selecting the above functions.

In this embodiment, three motors are used: a sequence driving motor (hereinafter referred to as S) Ms, a film feeding driving motor (hereinafter referred to as F motor) Mf, and an automatic focusing motor (hereinafter referred to as AF motor) Maf. I have.

FIG. 1 is a block diagram of an embodiment of the present invention. Reference numeral 100 denotes a microcomputer (hereinafter, referred to as an MCU) which executes a predetermined routine for various inputs and performs various outputs to realize various functions. 101 is an AE metering circuit, 102 is an AF metering circuit, and 103 is an information setting circuit. Each is connected to the ports P1, P2, and P3 of the MCU 100, and the MCU 100 receives various information. Reference numeral 104 denotes a display circuit, and the MCU 100 ports the AE display information output calculated based on the output of the AE metering circuit and the display information output calculated based on the outputs of the AF metering circuit 102 and the information setting circuit 103. A predetermined display is performed by outputting to P4.

105 is an aperture control circuit. When the exposure control mode is the program mode or the shutter priority mode, the aperture stop of the lens is stopped down after the release to rotate the slit plate 34 (FIG. 3).
), And transmits the aperture encoder pulse obtained by shaping the output of the aperture control photo interrupter to the MCU 100 via the port P5. The MCU 100 measures the number of generated pulses, and when the number reaches the predetermined number, energizes the aperture control magnet via the port P5 to lock the aperture of the lens at an aperture value that allows proper exposure.

106 is a shutter control circuit. The MCU 100 controls via the port P6. The shutter rear curtain is locked by energizing the rear curtain locking magnet (hereinafter referred to as front curtain Mg (not shown)) and the rear curtain locking magnet (hereinafter referred to as rear curtain Mg (not shown)). The shutter speed is controlled by releasing the energization of the up-completion front curtain Mg to start traveling of the front curtain, and after a predetermined shutter control time, releasing the energization of the rear curtain Mg and running the rear curtain.

The switch SW0 is a release switch, and is connected to the input terminal 10 of the MCU 100. It is turned on by pressing the release button up to the second stroke. The switch SWr is a rewinding switch, the switch SWb is a back cover switch, and the switch SWF is a film presence / absence switch, which are connected to the input terminals I1, I2, and I3 of the MCU 100, respectively.

107 is an AF motor drive circuit, connected to port P7,
The CU 100 drives the AF drive motor based on the result calculated based on the output of the AF photometry circuit 102.

Reference numeral 108 denotes an S motor drive circuit, which is connected to the port P8 of the MCU 100. Charge switch SWch is the input terminal of MCU100
Connected to I4, solenoid S is connected to port P9 of MCU 100. The MCU 100 outputs to the ports P8 and P9 in response to the charge switch SWch after release, drives the S motor Ms and the solenoid S, starts the release sequence, performs mirror up operation, mirror down operation, and performs shutter charge operation. .

Reference numeral 110 denotes a film feed motor drive circuit, which is connected to the port P10 of the MCU 100. After the shutter control is completed, the MCU 100 outputs the signal to the port P10 to drive the F motor Mf to feed one frame of film. When the rewind switch SWr is pressed, rewinding of all frames is performed. Switch SWk
Is a reference switch, which is connected to the input terminal I5 of the MCU 100. 109 is a photo interrupter for film feeding,
Consisting of a diode D1 and a phototransistor Tr1,
The slit plate 59 rotates in the groove between them. Diode D1
Is connected to a power supply line (not shown), the cathode side of the diode D1 is connected to the port P12 of the MCU 100 via the resistor R1, and the emitter of the phototransistor Tr1 is connected to the resistor R2. , The other end of the resistor R2 is grounded. After the shutter control or after the shutter charge, the F-mode Mf is rotated forward, and at the same time, when the MCU 100 sets the port P12 to L, a current flows through the diode D1, and the diode D1 emits light. There is a state where the light of the diode D1 is blocked by the slit of the slit plate 59 and a state where the light passes through the slit due to the rotation of the slit plate 59. Therefore, a voltage change corresponding to the intensity of light occurs at a point where the waveform shaping circuit 111 is connected to the resistor R2.
The waveform shaping circuit 111 shapes the waveform so that a pulse corresponding to the film feed amount (ie, F encoder output)
Is input to the MCU 100 via the port P11. The MCU 100 measures the number of pulses input to the port 11 at a predetermined timing and drives the film feed motor drive circuit 110, thereby enabling the later-described film feed control. Therefore,
Slit plate 59, photo interrupter 109, waveform shaping circuit 1
11, and a film feed amount detecting means is constituted by the resistors R1 and R2.

FIG. 2 schematically shows the arrangement of each motor when the camera is viewed from the front.

The S motor Ms is provided in the hoisting spool. Following the S-motor Ms, the mechanism of the sequence system for driving the mirror, the diaphragm, and charging the shutter is assembled into the upper part on the winding side and the side face of the mirror box. Direction.

The F motor Mf is arranged between the spool chamber and the mirror box, and performs film winding by forward rotation and rewinding by reverse rotation. Switching between the hoisting transmission system and the rewinding transmission system uses a planetary gear clutch that revolves in forward and reverse rotations.

The AF motor Maf is provided below the rewind-side mirror box, and transmits its rotation to the lens side via a coupling provided below the take-up side of the bayonet to perform focusing driving.

FIG. 3 is a perspective view of the drive unit of the present embodiment, showing a state before release. Here, the details of the drive mechanism in the present embodiment will be described.

First, the operation of the sequence system in the present embodiment will be described. The operation of the S motor Ms is performed in two sections: a mirror up / aperture drive section and a mirror down / shutter charge section. In the first section (mirror up / aperture drive), the charge cam 2 formed integrally with the charge cam gear 1 rotates from 0 to 85 [゜], and in the second section (mirror down / shutter charge), the remaining 275 [ [゜] is rotated to return to the reference position. Thus, one sequence is completed by one rotation of the charge cam.

Here, the operation of the charge cam unit will be described. The locking lever 3 is turned left by the release lever 4 and is retracted from the charge cam groove, and the charge cam 2 is rotatable. At this time, the charge switch SWch is off. The S motor Ms is activated by a release signal accompanying the full depression of the shutter button, and the charge cam 2 starts to rotate leftward in the first section. A cam portion 2 a is provided at the upper end of the charge cam 2, and the release lever 4 is turned clockwise by the rotation of the charge cam 2, and is set on the locking claw 5. The locking lever 3, which can be turned clockwise with the release lever 4 turning right, falls into the groove 2b for locking the first section provided at the upper end of the charge cam to function as a stopper, and also functions as a charge switch SWch.
Are turned on in conjunction with each other to lock the drive of the S motor Ms. The release of the locking lever is performed by energizing the solenoid S. When the solenoid is energized, the locking claw 5 turns left and the locking of the release lever 4 is released.
The release lever is counterclockwise turned by the spring 6, but since the spring is set stronger than the switch SWch for urging the lock lever 3, it rotates with the lock lever 3 to release the lock of the charge cam 2. ing.

Next, the S motor Ms starts the operation of mirror down and shutter charge after the rear curtain of the shutter is completed. Also in this section, the release lever 4 is set to the locking claw 5 by the cam portion 2e provided at the upper end of the charge cam as in the first section. The locking lever drops into the groove 2c provided at the upper end of the charge cam at the reference position where the charge cam has rotated 275 [゜], and stops the charge cam as in the first section. The motor is stopped by turning on the charge switch SWch, and thereafter the short brake is applied for a certain period of time, and then the solenoid S is energized to release the locking lever 3 from the charge cam groove 2c. The release timing of the locking lever 3 is performed when the operation of the S motor Ms is completed, and the charge cam is always in a standby state for the next operation.

Next, the operation of the first section, ie, the mirror-up and aperture driving, will be described. The S motor Ms starts clockwise rotation by the generation of the release signal in response to the full depression of the shutter button. The rotation is transmitted to the charge cam gear 1 via the reduction gear systems 11 to 14, and rotates the charge cam 2 counterclockwise. A mirror drive pin 15 is fixedly provided at the lower end of the charge cam gear 1, and contacts the mirror drive lever 16 to rotate the lever clockwise. One end of the lever 16 is rotatably supported by a substrate (not shown), and the other end is engaged with a vertical lever 21 for driving a mirror provided on the substrate (not shown). With the rotation of 2, the lever 21 is turned clockwise. Mirror drive vertical lever 21, aperture return lever 22, aperture lever 23
These three points are coaxially supported by a substrate (not shown), and are urged in the left-handed direction by springs 24 and 25, respectively, and are in contact with the initial position setting pins 26. 27 is a movable mirror,
At the initial position (before the release), it is arranged in front of the film surface at an angle of 45 ° with respect to the photographing optical path. The movable mirror is rotatably supported by a rotating shaft 28, and is urged clockwise by a mirror down spring. A mirror driving pin 30 is implanted on a side surface of the mirror, and a lever provided at one end of the mirror driving vertical lever 21 is provided.
It protrudes into the 29 operation trajectories. With the operation of the first section described above, the mirror drive pin 30 is pushed up by the mirror drive vertical lever 21 turning clockwise, and the movable mirror
27 rises.

On the other hand, the aperture return lever 22 also turns clockwise with the mirror drive vertical lever. An aperture drive spring 31 is hung around the winding of the aperture return lever 22 and the aperture lever 23, and the aperture lever 23 also rotates clockwise through the spring. A stop lever of a lens (not shown) is in contact with one end 23a of the stop lever 23, and the stop inside the lens is gradually stopped down as the body-side stop lever rotates clockwise. A gear portion provided at the other end 23b of the aperture lever 23 meshes with an aperture control ratchet gear 33 and an aperture control slit plate 34 via a speed increasing gear 32, and an encoder output corresponding to a set aperture is provided. Throttle control for locking the ratchet gear. The stop control pawl 35 is held on a permanent magnet by being set on the suction surface. The suction is released by energizing the aperture Mg according to the pulse number pa for the set aperture, the locking claw 35 turns left, the ratchet gear 33 is locked, and the aperture lever is locked at the set position. I have.

A cam portion 21 a is provided at one end of the mirror drive vertical lever 21, and a roller 37 disposed at a tip end portion of the shutter release lever 36 is in contact with the cam portion 21 a. Shutter release lever 36
Is rotated counterclockwise by the cam 21a with the mirror up, and releases the shutter-side mechanical locking lever 38 engaged at the tip of the lever.

Next, the second section, which is the operation from the mirror down to the shutter charge, will be described.

After the shutter control, the solenoid S is energized to release the lock of the charge cam 2. Charge switch SWch at that time
, The S motor starts to rotate in the same direction as the first section. Mirror drive lever
16 is a mirror drive vertical lever with the rotation of the charge cam 2.
The movable mirror 27 also descends following the left turn by the return spring 25 of 21.

On the other hand, a bearing 42 fixed on the lever 41 by shutter charge is in contact with the cam portion 2d of the charge cam 2. The shutter charge lever 41 is rotatably supported by a substrate (not shown) so as to be rotatable, and a roller disposed at a tip end thereof is engaged with a shutter side charge lever. With the leftward rotation of the charge cam in the second section, the lever 41 is rotated clockwise to rotate the shutter side charge lever clockwise to set the shutter drive spring. One end 41b of the shutter charge lever 41 is engaged with the reset connection lever 43, and the shutter charge lever 41 is turned clockwise with the clockwise rotation of the shutter charge lever 41. A reset spring 45 is disposed between the reset connection lever 43 and the reset lever 44 so as to exert an internal force, and the biasing force pushes down the stopped Mg locking lever 35 in the locked state, and the Mg suction surface Has been reset to As a result, the stop of the aperture lever 23 is released, and the return spring 24 turns the aperture lever 23 to the left to return the in-lens aperture to the open position. By moving the second section of 275 [ダ ウ ン], the charge cam 2 completes mirror down and shutter charging, returns to the reference position, and completes one sequence.

Next, the film feeding system will be described. In this embodiment, the film winding system employs a spool drive system in which a perforation of the film is hooked on a claw 51a provided on the outer periphery of the spool 51 and wound.

The F motor Mf is mounted on a substrate (not shown) mounted on the camera body, and is disposed on the front of the shutter. A pinion gear 52 is fixed to the output shaft of the motor, and rotation is transmitted to the spool 51 via reduction gears 53 to 55. A planetary gear 56 is provided in the middle of the transmission gear,
The rotation is transmitted to the spool side with the clockwise rotation of the motor, and the rotation is transmitted to the rewind side with the clockwise rotation of the motor. Reference numeral 57 denotes a four-tooth sprocket, which functions as a follower for detecting the amount of movement of the film perforation. A gear 57a is provided below the sprocket, and transmits the rotation to a slit plate 59 via a reference gear 58. Reference gear
Reference numeral 58 denotes a gear which makes one rotation per one frame feed. A reference switch SWk which outputs one pulse per one rotation is provided on the outer periphery of the gear. The slit plate 59 has a resolution of generating 114 pulses for one frame of the film, and the position can be controlled so that the slit plate 59 stops at a constant encoder pulse from the output of the reference switch SWk.

The film feed speed fluctuates greatly due to high speed, low speed winding, fluctuations in power supply voltage, changes in the ambient temperature, and the like, and it is very difficult to always stop the film at a constant feed amount. In this embodiment, the film feed speed is monitored for such a change, and the brake control immediately before the stop is changed according to the monitored speed.
The amount of overshoot is controlled to be constant with respect to the target stop position.

The reference switch SWk is a switch that is turned off when a half frame (18 [mm] in the case of 35 mm film) is fed, and has a function of a feed reference SW for setting a photographing screen interval between perforations. The feed amount of the film is controlled so as to stop by counting 57 encoder pulses (half a frame) from the reference switch SWk. Since the film feed speed monitor is performed according to the time required for a predetermined section after the reference switch SWk is turned on, and the duty drive range is changed by the monitor value,
Higher speeds apply longer range braking, and slower speeds apply shorter range braking.

FIG. 4 is a timing chart of each feeding mode in this embodiment when the battery voltage is sufficient.

FIG. 4 (1) is a timing chart of the CH mode. Focus detection is started by a half-press signal generated by half-pressing the release button, and the AF motor Maf drives the lens based on the result, and stops by a release signal generated by full-pressing of the release button. The S motor Ms performs mirror driving and shutter charging, starts driving in response to a release signal, and first raises the mirror. After the mirror is raised, the shutter travels and the S motor operates again to enter the mirror down stroke. The F motor Mf starts driving in synchronization with the restart of the S motor Ms to feed the film. As described above, the simultaneous operation of the S motor Ms and the F motor Mf can reduce the time required for one sequence. AF motor Maf in this CH mode
Will be activated only before the first release, and will not be activated from the next frame, resulting in a so-called AF lock state.

FIG. 4 (2) is a timing chart of the CL mode. The CL mode is a mode for continuous shooting while the AF is driven. Like the CH mode, a delay time is required until the next release after control. In this embodiment, a delay time of about 200 [ms] is used. Therefore, in the CL mode, focus detection is performed after the mirror is lowered, and AF driving is performed during the sequence, thereby enabling continuous shooting while always performing a focusing operation on the subject.

FIG. 4 (3) is a timing chart of the S mode. The drive timing of each motor is the same as in the CH mode. For this reason, even in the single-frame shooting mode, depending on the way of release, it is a mode in which a sufficiently quick shooting is possible.

The combinations of the operation timings of the motors in the respective feeding modes described above are only examples, and various other combinations are conceivable. FIG. 5 shows an example.

FIG. 5A is a timing chart of the CH mode. Since the CH mode requires a combination in which the operation time of one sequence is the shortest, recombination is not possible. Therefore, the sequence of the CH mode in FIG. 5 (1) is the same as the sequence in FIG. 4 (1).

FIG. 5 (2) is a timing chart of the CL mode. In the CL mode, the S motor Ms, F
The motor Mf was operated in the same manner as in the CH mode, but the motor Mf was operated in series in FIG.
f is operated in parallel with both motors Ms and Mf. This combination has the advantage that the operating margin is increased even if the AF motor Maf is operated in parallel with other motors even when the power supply is reduced, since the AF motor Maf has the lightest load.

FIG. 5 (3) is a timing chart of the S mode. In the S mode, as in the CL mode, the S motor Ms and F
The motor Mf is operated in series.

FIG. 6 is a timing chart of each feeding mode in this embodiment when the battery capacity is not sufficient. In the present invention, when the battery capacity becomes insufficient, the section in which two or more motors are driven in parallel in the CH and CL modes is eliminated, and all the motors are operated in series. In the normal sequence, in both CH and CL modes, two or more motors are operated in parallel.However, when the film winding load becomes heavy, the battery usage time elapses, or the ambient temperature decreases, the power supply In some cases, for example, the power supply capacity is exceeded, and one of the motors stops. When two or more motors are operated in parallel as described above, the number of film feeds may become extremely small depending on the power supply state. In preparation for such a case, the operation speed of the motor is monitored separately for each operation section, and when the speed becomes slower than a preset speed (when there is no room for the power supply capability), the feeding mode is switched. It was configured as follows.

FIG. 7 is a flowchart of the main routine of the MCU 100. When the power is supplied to the MCU 100, the operation starts from a predetermined address of the MCU 100. In step # 0, initial settings of a memory, a timer, and flags are performed. In step # 1, the photometry routine is called, and the photometry circuit for AE is used.
An A / D conversion value of the photometry output for AE and AF is obtained from the photometry circuit 101 or AF photometry circuit 102. Subsequently, in step # 2, an information setting routine is called, and various mode information, film sensitivity information, shutter speed information, lens aperture information, and the like are read from the information setting circuit 103. Then, in step # 3, a calculation routine is called, an apex calculation or a calculation for AF driving is performed based on the information obtained in step # 1 or step # 2, and a display routine is called in step # 4. Then, the display circuit 104 is driven to perform AE / AF display according to the result obtained. In step # 5,
Check whether film winding is completed. If the winding is not completed, the process returns to step # 1, but if completed, the process proceeds to step # 6. In Step # 6, Step #
AF according to the calculation result for AF drive obtained in 3
Drive the motor. Then, in step # 7, release inhibition is released. At this point, the release sequence can be started by turning on the release switch SW0. If no interruption occurs, the process returns from step # 7 to step # 1 and repeats the processing from step # 1 to step # 7.

On the other hand, when the release switch SW0 is turned on and the camera enters the release sequence, the process jumps from step # 49 of the interrupt processing routine of FIG. 8 to step # 10 of FIG.
In step # 10, the stack pointer is reset, and the timer and the flags are changed to the settings adjusted after the release. In step # 11, a mirror-up routine shown in FIG. 9A is called to perform control from sequence startup to aperture control and mirror-up completion. Subsequently, in step # 12, a shutter control routine is called to control to a predetermined shutter speed. Then, in step # 13, a mirror down routine is called, and processes such as shutter charge from mirror down are performed. While the mirror is down, film winding is performed in parallel by an interrupt processing routine. When the mirror down is completed, Step # 13 to Step # 1
Then, the control for the next frame starting from the re-metering after the mirror down is started.

FIG. 8 is a flowchart of an interrupt processing routine of the MCU 100. Even during execution of the main routine of FIG. 7, interruption is performed at predetermined time intervals (for example, 2 [ms]) to perform a certain process.

In step # 41, it is checked whether rewinding is in progress. If rewinding is in progress, the process proceeds to step # 52; otherwise, the process proceeds to step # 42. In step # 42, it is checked whether or not the shutter has been released. If the shutter has been released, the process proceeds to step # 51.
Otherwise, go to step # 43. In step # 43, it is determined whether or not the rewind switch SWr is on.
If Wr is on, proceed to step # 50; otherwise, proceed to step # 44. In step # 44, it is checked whether or not the release is possible. If the release is not prohibited, the process proceeds to step # 45. If the release is still prohibited, the process returns and the process before the interruption is continued.

Therefore, the process proceeds to step # 45 after the release prohibition is released in step # 7. Step # 45
In, it is checked whether the feed mode is CH. If it is CH, the process proceeds to step # 49. If it is not CH (CL or S), the process proceeds to step # 46. In step # 46, it is checked whether or not the feeding mode is CL.
If not CL (if S), proceed to step # 48. The process proceeds to step # 48 in the case of the S mode.
In step # 48, it is determined whether or not the release switch SW0 is off. If it has been turned off, the process proceeds to step # 49, but if it has been turned on, it returns and continues the process before the interruption. This is because the S mode is a mode in which resumption of release is denied when the release switch SW0 is kept pressed. The operation proceeds to step # 47 in the case of the CL mode.
Check whether 0 [ms] has passed. If 200 [ms] has elapsed, the process proceeds to step # 49. If not, the process returns and the process before the interruption is continued. Because CL
This is because the mode requires time for AF driving after release. Therefore, the process proceeds to step # 49 when release is possible in each feeding mode. In step # 49, it is checked whether or not the release switch SW0 is turned on. If it is on, it jumps to step # 10 of the main routine in FIG. 7, and if it is off, it returns and continues the process before the interruption.

Although the interrupt shown in FIG. 8 is not performed until the shutter control is completed after the release, the mirror-down process is executed again.
When interruption is enabled, step # 41 → step # 42 →
Proceeding to step # 51, in step # 51, the film winding routine shown in FIG. 11 is called, the process for each stage in the film winding process is performed in a short time, and the process returns. Perform down processing.

On the other hand, the process proceeds to step # 50 when it is detected in step # 43 that the rewind switch SWr is turned on. In step # 50, a voltage is applied to the F motor Mf in a direction opposite to that in the case of film winding. To switch the feed system to operate. When the reverse rotation of the F motor starts, the process returns and the processing before the interruption is continued. Then, when the next interruption occurs, the process proceeds from step # 41 to step # 52. Step #
At 52, it is checked whether the film presence / absence switch SWF is on. If it is turned on, the process proceeds to step # 53. If it is turned off, the process returns and the process before the interruption is continued.
The film presence / absence switch SWF is a switch that is turned on when the film is on the sprocket, and is turned off when the film is no longer on the sprocket. Therefore, if it remains off, it returns and continues rewinding. When the film does not hit the sprocket, the film presence / absence switch SWF is turned on, so that the process proceeds from step # 52 to step # 53. In step # 53, both ends of the F motor are short-circuited to apply a brake. And step # 54
In, the power supply to the F motor is released for 10 [ms]. Next, in step # 55, the F motor is rotated forward for 50 [ms]. This is to make it easier to load a new film by switching the feeding system to make the spool free. When the process returns from step # 55, the process before interruption is continued. However, when the process returns to the interrupt process routine, the process does not proceed from step # 41 to step # 52 since the rewind process has been completed.

FIG. 12 is a timing chart of a sequence after release when the battery capacity is sufficient. The flow of this figure will be described with reference to the flowcharts of FIGS. 7 to 11.

When the power of the MCU 100 is turned on, step # 0 in FIG.
, The processes from step # 1 to step # 4 are performed, and the display based on the calculation result is performed. In step # 5, it is checked whether or not the winding is completed. Since the normal winding is completed immediately after the power is turned on, the AF drive is performed. In step # 7, the release prohibition is released, and from step # 1. Step # 7 is repeated.

During this time, an interrupt occurs at a predetermined time interval, and the processing in FIG. 8 is performed. However, since the rewinding and the release sequence have not been started yet, step # 41 → step # 42 → step # 43 → step # 44 And proceed. Step #
When the release prohibition is released in step 7, step # 44
To step # 45. Step # 45 to Step #
Condition 48 is a release prohibition condition for photographing the next frame after release in each feed mode, and the process can proceed to step # 49 at first. If ON is checked when checking the release switch SW0 in step # 49, the flow jumps to step # 10 in FIG. 7 to start the release sequence (t
= T0).

In step # 10, a flag and a timer for switching immediately after the release are set. In step # 11, the mirror up routine shown in FIG. 9A is called to perform control from the start of the sequence to the aperture control and the completion of mirror up.

First, in step # 101 of FIG.
g and the rear curtain Mg are energized to lock the shutter curtain, and in step # 102, the S motor is energized. Then, the mirror-up operation starts, and the focusing of the lens also starts. In step # 103, the interruption of the event counter for enabling the aperture control is released. Then, in step # 104, the charge switch SWch is set to o
Wait until ff. Since there is play, a short time after energization of the S motor, an aperture encoder pulse is input as the lens is stopped down.

On the other hand, the interrupt processing of the event counter is performed as shown in FIG. 9 (b). Aperture encoder pulse number pa corresponding to the aperture value to be controlled in step # 3
When pa is set in the event counter, when the number of pulses corresponding to pa in the event counter is measured (t = t1), an interrupt shown in FIG. In step # 201, the aperture of the lens can be stopped at the calculated aperture value by energizing the aperture Mg. In step # 202, the interruption of the event counter is prohibited.

In step # 104, the charge switch SWch is turned off
Then (t = t2), the process proceeds from step # 104 to step # 105. In step # 105, both ends of the S motor are short-circuited to apply a brake. Then, in step # 106, the time tc from when the S motor is energized to when it is stopped is stored. This time tc is short if the battery has a sufficient capacity, but becomes longer if the battery has a small capacity. Subsequently, in step # 107, after waiting for 13 [ms], the shutter control system is stabilized. Therefore, the process returns from the mirror-up routine of FIG. 9A, and proceeds from step # 11 to step # 12 of FIG. move on.

In step # 12, the shutter control routine is called, and when the energization of the front curtain Mg is released, the running of the front curtain starts. When the energization of the rear curtain Mg is released after a predetermined shutter closing time (t = t3), The curtain starts running, and control to a predetermined shutter speed is performed.

When the process proceeds from step # 12 to step # 13, the mirror down routine of FIG. 10 is called.

In step # 301, necessary timers and flags are set after mirror down, and in step # 302
When the power supply to the S motor is released at (t = t5), the brake state is released. In step # 303, it is checked whether the time tc required for mirror up is 75 [ms] or less. When the battery has a sufficient capacity, tc is short, so the process proceeds from step # 303 to step # 304, but otherwise, the process jumps to step # 305. Since FIG. 12 shows that the battery has a sufficient capacity, the flow proceeds to step # 304 to energize the F motor in the forward direction to start the hoisting operation. Then, in step # 305, when the prohibition of the timer interrupt is released, the timer interrupt becomes possible.
In FIG. 8, the process proceeds from step # 41 → step # 42 → step # 51 to execute the film winding routine shown in FIG. 11, which will be described later in detail.

In step # 306, the solenoid S is energized (t = t6), and in step # 307, the control waits until the charge switch SWch is turned off. When a sufficient force is transmitted by the solenoid S, the charge switch SWch is turned off (t = t7), and the process proceeds from step # 307 to step # 308.
In step # 308, the energization of the solenoid S is released, and in step # 309, the S motor is energized. Therefore, control of the second section starts. And step # 310
Waits for the charge switch SWch to turn on. When the drive required for the mirror-down shutter charge is completed, the charge switch SWch is turned on (t = t8), and the process proceeds from step # 310 to step # 311. In step # 311, the S motor is braked for 20 [ms], and in step # 314, the solenoid S is energized again (t = t
9). In step # 313, the charge switch SW is again
Wait for ch to turn off. When a sufficient power is transmitted by the solenoid S, the charge switch SWch is turned off (t = t
10), proceed from step # 313 to step # 314. In step # 314, the energization of the solenoid S is released.
When the processing up to step # 314 is completed, the process proceeds from step # 13 to step # 1 in FIG. 7, and the processing from photometry for photographing the next frame is started. However, until the winding is completed, the process returns from step # 5 to step # 1 to perform the AF drive in step # 6, and the step # 6
The release prohibition in 7 is not released.

As described above, after the timer interrupt is canceled in step # 305, a timer interrupt occurs at predetermined time intervals during the above-described mirror down process, and the film winding routine shown in FIG. 11 is executed.

In step # 401 of FIG. 11, it is checked whether the film is being wound. If the film is being wound, the process proceeds to step # 402. If the film is wound or before the film winding, the process proceeds to step # 418. Since the winding has already started in step # 304, the process proceeds to step # 402. In step # 402, it is checked whether or not the reference switch SWk has been turned off. If it has not been turned off, the process proceeds to step # 403. If it has been turned off, the process proceeds to step # 409. Immediately after the start of hoisting
Since it is on, the process proceeds to step # 403. In step # 403, it is checked whether or not the battery has sufficient capacity. If it is, the process proceeds to step # 404.
Proceed to. Whether the capacity of the battery is sufficient or not depends on the determination conditions of step # 303 and step # 405. That is, when the time tc required for the mirror-up is longer than a predetermined value and the driving of the F motor is delayed, or when the time tf1 required for the 15-pulse F encoder to advance after winding is longer than the predetermined value, the winding is stopped halfway. If so, the process proceeds to step # 407 assuming that the battery capacity is not sufficient. Therefore, in the case of FIG.
Since the condition of step # 303 has been cleared and the determination of step # 405 has not been completed, the process proceeds to step # 404. Step # 4
At 04, it is checked whether the number of F encoder pulses is 15 or less. If it is less than 15 pulses, the process returns. If it exceeds 15 pulses, the process proceeds to step # 405. Once returned, the process returns to the mirror down routine processing in FIG.
When the timer interrupt is released in step # 305, the process is interrupted from the timer interrupt processing routine shown in FIG. 8 at predetermined time intervals, the processing is performed, and the routine proceeds to the routine shown in FIG. After the film winding is started, the film is interrupted one after another until the film is wound up, and the branch from step # 401 is performed. For a while after the start of hoisting, the path returns from step # 404. However, when hoisting for 15 pulses is performed, the process proceeds from step # 404 to step # 405. In step # 405, it is checked whether the time tf1 required to wind up by 15 pulses is smaller than 65 [ms]. If it is longer, the process proceeds to step # 406, and if shorter, the process proceeds to step # 407. If the capacity of the battery is small, it takes time to wind up and may be longer than 65 [ms]. However, if the capacity of the battery is sufficient, it does not take much time, so the process proceeds to step # 407. In step # 407, the reference switch SWk is turned off
Find out if you are. Step # 4 if off
Go to 08 and return if it remains on. Since the reference switch SWk is turned off when the film has been transported by half a frame, the winding proceeds for a while while taking a path returning from step # 407. Then, when the winding of half a frame is performed, the reference switch SWk is turned off (t = t1
1) The process proceeds from step # 407 to step # 408. In step # 408, the pulse counter for feeding and the timer for measurement are reset and the process returns. Then, in the next interruption, the process proceeds from step # 402 to step # 409. In step # 409, it is checked whether the number of F encoder pulses is equal to or less than 20 pulses. If less than 20 pulses, the process proceeds to step # 410. If more than 20 pulses, the process proceeds to step # 412. In step # 410, a point to start pulse driving according to the time tf2 from when the reference switch SWk is turned off is obtained by a pulse number conversion px, and the process returns. Table 1 shows the relationship between tf2 and px. In other words, if the battery capacity is sufficient and the hoisting speed is high, when the F encoder measures 37 pulses after the reference switch SWk is turned off, the drive of the F motor is changed to a pulse drive with a duty ratio of 50 [%]. Switch, and at the latest, 57
100% drive is continued until the pulse, and at the intermediate speed, the starting point of the pulse drive is determined according to the speed.

After the reference switch SWk is turned off, the process returns via step # 410 until 20 F encoder pulses are output. Then, when 20 pulses of the F encoder pulse are output, the process proceeds from step # 409 to step # 412. Since step # 410 does not pass thereafter, the pulse driving start point px obtained by the time tf2 required for driving for 20 pulses at this time is fixed. In step # 412,
Check whether the number of F encoder pulses is 57 pulses or more. If it is 57 pulses or more, the process proceeds to step # 413, and if it is less than 57 pulses, the process proceeds to step # 414. Step # 414
, It is checked whether the number of F encoder pulses is equal to or greater than px pulses. If it is equal to or greater than the px pulse, the process proceeds to step # 413, and if it is less than the px pulse, the process returns. After measuring the speed of 20 pulses, the winding continues for a while on the path returning from step # 414, but the number of pulses p obtained in step # 410
After x minutes of film has been sent, the process proceeds from step # 414 to step # 415. For example, if tf2 is 26 [ms], Px = 41 [pulse] in step # 410 according to Table 1
Is obtained, and after the reference switch SWk is turned off, the output of the F encoder for 41 pulses is measured.
Proceed to. In step # 415, it is determined whether the count value td of the pulse driving timer is greater than 2 [ms]. If it is greater than 2 [ms], the process proceeds to step # 416. Proceed to step # 417. In step # 416, the both ends of the F motor are short-circuited to apply a brake. In step # 417, the F motor is energized in the forward direction to rotate forward, and the process returns after each process. Therefore, when the count value td of the timer for pulse driving is configured to return to 0 at 4 [ms], the F motor rotates forward when the count value td of the timer is 0 to 2 [ms], and the count value of the timer. Is 2 to 4 [ms], the F motor is braked, so the duty ratio 50
[%] Pulse driving becomes possible. When the pulse drive starts, braking is applied and the hoisting speed decreases while step #
Hoisting on the route from step 415 to step # 416 or step # 417 continues. As the output of the 57-pulse F encoder for half a frame of film approaches, the winding speed approaches constant. Then, after winding by 57 pulses, the process proceeds from step # 412 to step # 413 to set flags necessary for completion of winding, and proceeds to step # 416 to apply a brake to the F motor. Upon completion of hoisting, the process proceeds from step # 401 to step # 418, and in step # 418, it is determined whether or not braking is in progress after completion of hoisting. While braking,
Proceed to step # 419, otherwise step # 4
Proceed to 21. Now, immediately after the hoisting is completed, the brake is in progress, and the process proceeds to step # 419. In step # 419, 20
It is checked whether or not [ms] has elapsed. If the time is equal to or less than 20 [ms], the process returns to continue the state, and if 20 [ms] has elapsed, the process proceeds to step # 420. In step # 420, the energization of the F motor Mf is released, and the routine returns. Then, step #
When the process proceeds from 401 to step # 418, the brake has been completed, so the process proceeds to step # 421. In step # 421, it is checked whether or not the shutter charge has been completed. If the shutter charge has been completed, step # 42
Proceed to 2 and return if not completed. Whether the film winding or shutter charge completion is earlier depends on the battery capacity and the film load. If the shutter charge has already been completed, the process directly proceeds to step # 422, otherwise returns to complete the shutter charge. Repeat the process until it returns. Step #
At 422, a check is made to see if the film feed is incomplete.
If not completed, the process proceeds to step # 417, and if completed, the process proceeds to step # 423. At this point, the feeding is not completed when the battery capacity is insufficient and the film feeding is waited until the shutter charge is completed or when the feeding is stopped halfway. In the case of FIG. 12, when the capacity of the battery is sufficient, the process of the predetermined step for feeding the film has been completed, and the process proceeds to step # 423. Step # 423
In, a flag for terminating the release sequence is set. Therefore, when the process returns in step # 423, the process proceeds from step # 42 of FIG. 8 to step # 43 in the next timer interrupt, and the film winding routine is not called. In addition, since the winding has been completed in step # 5 in FIG. 7, the process can proceed from step # 5 to step # 6, and the AF drive becomes possible. If the AF mode is AF-S, the process proceeds from step # 6 to step # 7 when the AF drive is completed, and if the mode is AF-C, the process immediately proceeds to step # 7 to release the release prohibition. Then, step # 43 → step # 44 → step #
When the release switch SW0 is turned on, the next sequence starts according to the feeding mode. That is, if the mode is the CH mode, the process proceeds from step # 45 → step # 49 → step # 10, and the next release can be immediately performed. If the mode is the CL mode, the sequence proceeds from step # 45 → step # 46 → step # 47 → step # 49 → step # 10, and enters a release sequence with a delay of 200 [ms]. If the mode is the S mode, the process proceeds to step # 45 → step # 46 → step # 48 → step # 49 → step # 10, and the release switch SW0 is turned off.
Wait for it to start the release sequence.

FIG. 13 is a timing chart of a release sequence when the battery capacity is insufficient. When the capacity of the battery decreases, the relative load increases when the S motor is driven after the release, and it takes time to mirror up. Therefore, the time tc required for the mirror up becomes larger than the predetermined value, and jumps from step # 303 to step # 305 under the determination condition of step # 303 in the mirror down routine of FIG. When the timer interrupt is released in step # 305, the interrupt processing routine of FIG. 8 proceeds to step # 41 → step # 42 → step # 51 similarly to the case of FIG. The film winding routine is called. However, in the film winding routine of FIG. 11,
Since the hoisting by the F motor has not been started, it is not during braking, and step # 401 → step # 418 → step # 42
Proceed with 1. When it is determined in step # 421 whether or not the shutter charge has been completed, the process returns if the shutter charge has not been completed. Therefore, this routine simply returns until the shutter charge at t = t10 is completed. Therefore, during this time, the mirror down routine of FIG. 10 substantially proceeds. As in the case of FIG. 12, when the processing up to step # 314 is completed and the shutter charging is completed (t = t10), the process can proceed from step # 421 to step # 422 in FIG. In step # 422, it is checked whether or not the film winding is completed. Since the winding has not been started as described above, the process proceeds from step # 422 to step # 417.

In step # 417, film winding is started by rotating the F motor forward. When the process of step # 417 returns, the process proceeds to step # 401 due to the next timer interrupt, and since the winding is in progress, the process proceeds to step # 402. In step # 402, it is checked whether or not the reference switch SWk is off.
Proceed to. Then, in step # 403, it is checked whether or not the battery has sufficient capacity. However, it is determined that the energization of the F motor is to be waited for in the determination condition of step # 303, so the process proceeds to step # 407. In short, since the shutter charge has been completed, it is not necessary to make a determination to stop in the middle of winding, and if so, the vehicle will not proceed further. Accordingly, in the following, the same processing as in FIG. 12 is performed, the winding of the film is completed, and the brake is applied.
During this time, the battery capacity is extremely small and it takes time to wind up.
When tf2 exceeds 52 [ms], in step # 410, Px =
57 is obtained. In such a case, hoisting is stopped without pulse driving. However, at this time, the drive speed just before the stop is sufficient when the battery capacity is sufficient and the pulse drive is approached much before the stop position, so that it is possible to eliminate the drive voltage variation due to the decrease in the battery capacity. become. In this manner, when the brakes are similarly processed in steps # 418 to # 420 and completed, the process proceeds to step # 418 → step # 421. In step # 421, it is determined whether the shutter charge has been completed. If it is determined that the shutter charge has been completed (t = t10), the flow proceeds to step # 422. In step # 422, it is checked whether or not the winding has been completed. Since it has been completed, the process proceeds to step # 423. In step # 423, when the flags necessary for the end of the release sequence are set and the routine returns, the photographing of the next frame can be performed according to the AF mode or the feed mode, as in FIG. Unlike the case of FIG. 12, since the F motor is not energized while the S motor is energized, the load during the energization of the S motor is reduced, the battery voltage is suppressed from being reduced, and the battery can be used even if the battery capacity is further reduced. Become.

FIG. 14 is a timing chart of a release sequence when the load on the film is heavy when the capacity of the battery is reduced. This is an example of a case where the capacity of the battery has decreased as in the case of FIG.
Does not exceed the predetermined value. Therefore, as in the case of FIG. 12, step # during the mirror down routine of FIG.
In the determination condition of 303, from step # 303 to step #
Proceeding to 304, the F motor is energized to start winding. In step # 305, when the timer interrupt is released, the interrupt processing routine of FIG.
As in the case of the figure, the process proceeds from step # 41 → step # 42 → step # 51, and the film winding routine of FIG. 11 is called every time the timer is interrupted. Then, also in the film winding routine of FIG. 11, the process proceeds from step # 401 → step # 402 → step # 403 → step # 04. In step # 404, the process returns until winding of 15 pulses is completed. Then, when winding up by 15 pulses, step #
Proceed to 405. In step # 405, the time tf1 required to wind up 15 pulses is compared with a predetermined value. The load during the mirror-up process is constant, but when the temperature is low or the film is hard, the load when feeding the film increases. In such a case, the time tf2 required to wind up by 15 pulses increases even if the time tc required for mirror up does not become too long. Then, the process proceeds from step # 405 to step # 406. In step # 406, the power supply to the F motor is released to stop the winding, and the associated flags are reset. When the process returns from step # 406, when the process proceeds to step # 401 by the next timer interruption, since the winding is not being performed, the routine simply returns as in the case of FIG. Therefore, during this time, the routine of FIG. 10 substantially proceeds. Then, when the processing up to step # 314 is completed and the shutter charging is completed (t = t10), it is possible to proceed from step # 421 to step # 422 in FIG. In step # 422, it is checked whether or not the film winding is completed. Since the winding has not been started as described above, the process proceeds from step # 422 to step # 417. In step # 417, the film winding is restarted by rotating the F motor forward. When the process in the step # 417 returns, the next timer interrupt causes a step # 401.
When the process proceeds to, the winding is being performed, and the process proceeds to step # 402 and step # 403 again. Since the operation has already been stopped halfway according to the determination condition of step # 405, the process proceeds to step # 407 as a battery capacity shortage. Then, in step # 407, the flow returns as it is until the reference switch SWk is turned off. Therefore, as in FIG. 12, the subsequent processing is performed to complete the film winding, and the brake is applied. Similarly, when the brakes have been processed in steps # 418 to # 420 and completed, the process proceeds from step # 418 to step # 421. In step # 421, it is determined whether the shutter charge has been completed. If it is determined that the shutter charge has been completed (t = t10), the flow proceeds to step # 422. In step # 422, it is checked whether or not the winding has been completed. Since it has been completed, the process proceeds to step # 423. In step # 423, when the flags necessary for the end of the release sequence are set and the routine returns, the photographing of the next frame can be performed according to the AF mode or the feed mode, as in FIG. Unlike the case of FIG. 12, since the F motor is not energized while the S motor is energized, the load during the energization of the S motor is reduced, the battery voltage is suppressed from being reduced, and the battery can be used even if the battery capacity is further reduced. Become.

In the present embodiment, the output point of the reference SW is set at the center of the film feed amount, but this is an arbitrary value. Also, in the present embodiment, the speed monitor point also has a large difference from the final speed at the beginning of film winding, and when approaching the stop point, a sufficient monitoring range cannot be obtained, and the speed monitor point is easily affected by an instantaneous change. Therefore, the point sent to some extent is selected, but this is also an arbitrary value.

〔The invention's effect〕

As described above, according to the present invention, one frame of film can be accurately fed without being affected by the power supply condition, the film load, the number of winding frames, and the like, and the film screen interval can be made constant.

[Brief description of the drawings]

FIG. 1 shows a block diagram of the present embodiment. FIG. 2 shows the arrangement of the motor in this embodiment. FIG. 3 is a perspective view of the driving mechanism in the present embodiment. FIG. 4, FIG. 5, and FIG. 12 are timing charts of each feeding mode in the present embodiment when the capacity voltage is sufficient. FIGS. 6, 13 and 14 are timing charts of each feeding mode in this embodiment when the battery capacity is not sufficient. FIG. 7 is a flowchart of the main routine of the MCU 100. FIG. 8 is a flowchart of a timer interrupt processing routine of the MCU 100. FIG. 9 is a flowchart of a mirror up routine of the MCU 100. FIG. 10 is a flowchart of a mirror down routine of the MCU 100. FIG. 11 is a flowchart of a film winding routine of the MCU 100. FIG. 15 shows the relationship between the solenoid energizing time and the amount of driving force. [Description of Signs of Main Parts] Ms: Sequence motor (S motor) Mf: Film feed motor (F motor) Maf: AF drive motor (AF motor), S: Solenoid SWch: Charge switch, SWk Reference switch 2 Charge cam 3, Lock lever 4 Release lever 5, Lock claw 100 Microcomputer (MCU)

Claims (2)

(57) [Claims] 1. A film feed motor for winding a film through a single drive system, and the feed motor is controlled in a first section from a start of winding of the film to a predetermined position by controlling the supply of drive power. Drive control means for continuously driving the film feeder and driving the feed motor with a pulse having a constant duty ratio in a second section from the predetermined position to the completion of winding of the film; and, in the first section, a winding speed of the film. A camera with a built-in motor, comprising: detecting means for detecting the position; and changing means for changing the predetermined position in accordance with the film winding speed obtained by the detecting means. 2. A camera with a built-in motor, comprising: a film feed motor for winding a film through a single drive system; and detecting means for detecting a film winding speed during the winding of the film. The film is wound by a predetermined amount, and a predetermined section before the winding is completed is braked by driving with a pulse having a constant duty ratio, and film drive control means for performing only braking after the winding completion point is obtained by the detection means. Changing means for changing a length of the predetermined section according to a film winding speed.