JPS6289939A - Electric driving device for camera - Google Patents

Abstract

PURPOSE:To suppress sound and time loss due to automatic speed change to the minimum level and to return optionally the speed change ratio of transmission systems to the high speed side by fixing the speed change ratio of transmission systems to the low speed side for the same film after the automatic speed change is performed once and releasing fixing of the speed change ratio to the low speed side by an operating means. CONSTITUTION:Automatic speed changes are not performed for winding of each frame, but the automatic speed change mode is stored in a register 2a till the end of the film after the automatic speed change is performed once, and each frame is wound at the low speed reduction ratio from the first, thereby suppressing switching sound and time loss due to automatic speed change to the minimum level. Since frames following the frame for which the automatic speed change is performed are probably under the same conditions (voltage and temperature), it does not matter though the automatic speed change is not performed for each frame. Since the automatic speed change mode is reset to the initialization mode when a set button 1a is depressed once, the reduction ratio is returned to the high speed side easily if the condition of the ambient temperature is changed on the way of the film or a battery is restored.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention provides a transmission system connected between a motor and a load having at least two speed ratios, and these speed ratios being switchable. This invention relates to improvements to electric drive devices for cameras.

(Background of the Invention) In recent years, electric drive devices using motors have been widely adopted, and functions such as shutter and lens charging, film winding, and rewinding are driven by a single motor or multiple motors, making them extremely easy to operate. has also improved. Under these circumstances, the applicant has proposed a system in which the hoisting transmission system accommodates multiple reduction ratios, switches the reduction ratio according to the power supply status, load status, etc., and drives the motor in the optimal condition. The application has already been filed. In such a device, if an automatic speed change is performed in which the reduction ratio is switched from high speed to low speed each time each piece is hoisted, a noise caused by the reduction ratio switching and a time loss occur.

As an improvement to this, the present inventors are considering fixing the gear ratio of the transmission system to a low speed for the same film once automatic gear shifting is performed. In that case, the same film may be shot under different temperature conditions (from a ski resort to a hotel or at a club meeting), or the battery may recover.

It may also be possible to wind or charge the film at a high speed reduction ratio. In such cases, if the gear ratio of the transmission system cannot be returned to high speed, the camera's functionality will be halved.

(Objective of the Invention) An object of the present invention is to solve the above-mentioned problems, to minimize noise and time loss associated with automatic gear shifting of the transmission system, and to enable the gear ratio of the transmission system to be arbitrarily set at high speeds. To provide an electric drive device for a camera that can be returned to the side.

(Characteristics of the Invention) In order to achieve the above object, the present invention switches the gear ratio of the transmission system from the high speed side to the low speed side in response to a decrease in the rotational speed of the motor, and maintains the switched gear ratio until the end of the film. A control means for maintaining the gear ratio and an operation means for returning the gear ratio that has been switched to the low speed side to the high speed side are provided. The gear ratio is fixed to the lower speed side, and the gear ratio is released from being fixed to the lower speed side by operating the operating means.

(Embodiment of the Invention) Fig. 1 shows the basic configuration of an embodiment of the present invention. The setting means 1 consists of a push-button type setting button 1a, and each time the setting button 1a is pressed, the single-shot high-speed The mode, continuous shooting high speed mode, and continuous shooting low speed mode are sequentially switched and set. The single-shot high-speed mode is a frame shooting mode in which the reduction ratio of the winding transmission system is usually high, and the speed automatically switches from high to low as the film winding speed decreases. In continuous shooting, the speed reduction ratio of the film winding transmission system is normally high, and the speed is automatically switched from high to low as the film winding speed decreases. This is a mode in which the reduction ratio of the hoisting transmission system is fixed at a low speed. When the single-shot high-speed mode or the quick-shot high-speed mode is set and the reduction ratio is automatically switched from high speed to low speed, pressing the setting button la once returns to the setting mode.

The control means 2 performs control according to the set mode, and stores the set mode, single-shot automatic speed change mode, and continuous shooting automatic/dynamic speed change mode in a built-in register 2a. In response to the signal from the control means 2, the display means 3 lights up the display element 3a in the single shooting high speed mode, turns on the display element 3b in the quick shooting high speed mode, lights up the display element 3C in the quick shooting low speed mode, and turns on the display element 3C in the single shooting automatic mode. In the speed change mode, the display element 3a blinks, and in the automatic speed change mode, the display element 3b (or display element 3c) blinks to display the mode.

When the single-shot high-speed mode or the quick-shot high-speed mode is set, upon completion of photography, the control means 2 consisting of, for example, a microcomputer operates the drive circuit 4 to rotate the winding motor M2 in one direction (for example, in the forward direction). let This causes the switching means 5 to switch to a high speed reduction ratio (low reduction ratio).
The transmission system is switched to the high-speed transmission system 6 having the following. As a result, the rotational force of the winding motor M2 is transmitted to the winding load 7 (including the film 8) via the high-speed transmission system 6, and the film 8 is wound at a relatively high speed.

During the driving period of the hoisting motor M2, an abnormally low speed detection process (Fig. 2) is performed by time interwoven processing.The timer interwoven processing interrupts the main routine at fixed time intervals set by an interwoven timer (not shown). During the motor drive period before winding completion is detected, an abnormally low speed is detected by an abnormally low speed detection process having a relatively large number of steps. As shown in Fig. 3, the abnormal low speed detection process monitors whether the pulse period t1 of the winding raw signal, which consists of pulses generated at every fixed rotation angle of the sprocket, exceeds the detection reference time. This is used to detect abnormally low speeds. Abnormally low speed detection at a high speed reduction ratio is performed in order to switch the reduction ratio to a low speed.

When the winding load 7 is heavy, or when the power supply voltage decreases due to the elapse of battery usage time or a drop in ambient temperature, the torque may be low at a high speed reduction ratio, and the film may not be able to be wound. In this case, by switching to a low speed reduction ratio and winding with a large torque, it is possible to determine whether the film cannot be wound at the end or because the winding load 7 is heavy or the like. Therefore, if the low-speed reduction ratio is set so that the torque is sufficiently large, the high-speed reduction ratio can be set to the optimum reduction ratio when the hoisting load 7 and power supply voltage are favorable. When an abnormally low speed is detected in the abnormally low speed detection process, as shown in FIG. 2, that is, the drive circuit 4 rotates the hoisting motor M2 in the other direction, whereby the switching means 5 switches to the low-speed transmission system 10 having a low-speed reduction ratio. Therefore, the rotational force of the winding motor M2 is transmitted to the winding load 7 via the low-speed transmission system 10, and the film 8 is wound at a relatively low speed. Then, the contents of the register 2a are changed to single-shot automatic speed change mode if the single-shot high-speed mode is selected, and to quick-shot automatic speed-change mode if the quick-shot high-speed mode is selected.

This automatic speed change mode is stored and retained until the end of the film. At the same time, the control means 2 causes the display element 3a or 3b of the display means 3 to blink.

After that, start the interactive timer and return to the main routine. When the speed reduction ratio is low, an abnormally low speed is determined to be the end of the film, and since there is no need to perform timer interrelated processing thereafter, the process returns to the main routine without starting the interrelated timer.

When the hoisting completion near signal is input from the detection means 9, the control means 2 controls the deceleration of the hoisting motor M2 by changing the drive signal to the drive circuit 4 in a duty manner or reducing the level of the drive voltage. Start. An abnormally low speed detection process is also performed during this deceleration control period, but this is another abnormally low speed detection process with a relatively small number of steps.

As shown in Fig. 3, this abnormally low speed detection process monitors whether or not the entire time difference t2 of the deceleration control period exceeds another detection reference time, and detects abnormally low speed when it exceeds another detection reference time. It is. As a result, the winding transmission system is automatically shifted by 2, and the timing of the deceleration control period t2 is restarted from the beginning. When the deceleration control period t2 at the low speed reduction ratio exceeds the detection reference time again, it is determined that the film has ended.

When the detection means 9 detects the completion of winding, stop control is performed.

When the end of the film is determined by detecting an abnormally low speed at a low speed reduction ratio, the film is rewound in the main routine processing, and after the rewinding is completed, the contents of the register 2a are returned from the automatic speed change mode to the initially set mode. Of course, the display means 3 displays the restored setting mode.

When the shooting location is moved from a place with a low temperature to a place with a high temperature, film winding may be possible at a high speed reduction ratio even if automatic gear shifting is performed in a low temperature place. Therefore, when the setting button la is pressed once, the control means 2 returns the contents of the register 2a from the automatic transmission mode to the initially set mode.

Although the switching means 5, the high-speed transmission system 6, and the low-speed transmission system 10 constitute the hoisting transmission system 2, the high-speed transmission system 6 and the low-speed transmission system 10 may share a part of the reduction gear train. In that case, the switching means 5 is inserted in the middle of the transmission system 6.10.

When the continuous shooting low speed mode is set, when an abnormally low film winding speed is detected, it is always determined that the film has finished. Therefore, automatic gear shifting is not performed.

According to this embodiment, the automatic speed change is not performed every time each frame is wound up, but once the automatic speed change is performed, the automatic speed change mode is stored in the register 2a from then on until the end of the film, and the winding of each frame is started from the low speed reduction ratio. Since this is done, the switching noise and time loss associated with automatic gear shifting can be minimized. When automatic gear shifting is performed, the subsequent frames are often under similar conditions (voltage, temperature), so there is no problem even if automatic gear shifting is not performed for each frame. In addition, by pressing the setting button la once, the automatic speed change mode returns to the initial setting mode, so if the ambient temperature changes mid-way through the film or the battery recovers, you can easily change the reduction ratio to a higher speed. It can be returned.

In this embodiment, the reduction ratio of 2 in the hoisting transmission system is switched by switching the rotational direction of the hoisting motor M2, but it may also be done by a magnet or the like. Further, although it is designed to be able to switch to one of two reduction ratios, it may also be possible to switch to three or more reduction ratios. Furthermore, although the return to the initial setting mode is performed after the rewinding is completed, the return to the initial setting mode may be made when the next film is loaded.

In this embodiment, the setting button 1a is used both as a means for setting the mode and for returning to the initial setting mode, but separate means may be provided for each.

In this embodiment, the present invention is applied to the winding motor M2, but the present invention can also be applied to a charging motor or a motor that drives winding, rewinding, and charging in one unit.

Examples of an electric drive device for a camera embodying the embodiment shown in FIG. 1 are shown in FIGS. 4 to 11.

FIG. 4 is a diagram showing the arrangement of each motor when the camera is viewed from the front. Ml is a charge motor that controls the shutter charge, the aperture adjustment mechanism, the aperture drive mechanism, and the mirror lifting mechanism, and is arranged at the front left end of the camera 20. As for the charge motor M1, load fluctuations due to environmental conditions are small, but since the absolute load is large, a relatively large motor is required, and is therefore housed in a grip 21 formed protruding from the front left end of the camera 20.

K1 is a charge transmission system for charge motor M1.

The winding motor M2 has a spool configuration 2 for winding the film.
The rewind motor M3 is located in the front right side of the camera 20, that is, on the cartridge side, and the rewind motor M3 is located adjacent to the rewind transmission system. . 23 is the power battery, which consists of four AA batteries.

FIG. 5 is a diagram showing the arrangement of each motor when the camera 20 is viewed from above. 24 is a film cartridge, 25 is a blade type longitudinal reshutter, 26 is a mirror elevating mechanism, 27 is a lens aperture adjustment mechanism, 28 is a lens aperture drive mechanism, and 29 is a sprocket configuration for determining the feed amount of the film 30.

FIG. 6 shows details of the charge motor M1 and charge transmission system 1.

Binion gear 101 is fixed to the output shaft of charge motor M1 and meshes with gear 102. Gears 102 and 103 constitute a two-stage gear, and are rotatably supported by shafts 114 set on base plate 117, respectively. The gears 102 and 103 each have protrusions 102a that alternately protrude in the thrust direction.
, 103a are formed, and by fitting these protrusions 102a and 103a, the gears 102 and 103 mesh and interlock in the rotational direction, but can freely move relative to each other in the thrust direction. On the other hand, the gear 103 has a surface in contact with a planetary lever 106 that rotates about a shaft 114, and is brought into frictional contact with the planetary lever 106 by a compression spring 104 disposed between the gears 102 and 103. As a result, the planetary lever 106 rotates following the rotational direction of the gear 103.

The gear 105 has a shaft 115 mounted on the planetary lever 106.
It is rotatably supported by a shaft and constantly meshes with the gear 103. The gear 107 constitutes a two-stage gear in which a large gear 107a and a small gear (not shown) fixedly formed on the upper part of the large gear 107a are rotatably supported on a shaft 111 set on a base plate 117. direction, and the gear 105 rotates counterclockwise (
When the planet lever 106 rotates in the direction of the arrow), the planetary lever 106 rotates clockwise and the large gear 107a meshes with the gear 105.

The gear 108 is rotatably supported by a shaft 112 mounted on a base plate 117, and includes a large gear 108a and a small gear (not shown) fixedly formed on the upper part of the large gear 108a. The large gear 108a is always meshed with the small gear of the gear 107. The gear 110 is rotatably supported by a shaft 116 mounted on the planetary lever 106, and is always engaged with the gear 103. When the gear 103 rotates counterclockwise and the planetary lever 106 rotates counterclockwise, the gear 110 rotates counterclockwise. 110 meshes with the large gear 108a. The cam gear 109 is rotatably supported by a shaft 124 mounted on a base plate 117, and has a gear 109a and a cam 113 formed therein. The gear 109a is always engaged with the small gear of the gear 108, and the transmission system from the binion gear lot to the cam gear 109 is switched depending on the rotational direction of the charge motor M1. That is, the charge motor Ml is rotated counterclockwise.
When rotated, each part rotates in the direction of the solid line arrow, and the clockwise rotation of the planetary lever 106 causes the binion gear lO1→
The gear train is switched to a low-speed gear train with a large reduction ratio, consisting of gears 102, 103 → gear 105 → gear 107 (large gear 107a, small gear) → gear 108 (large gear 108a, small gear) → cam gear 109. On the other hand, when the charge motor Ml rotates clockwise, each part rotates in the direction of the dotted arrow,
By rotating the planetary lever 106 in the counterclockwise direction, the rotation of the pinion gear 101 → gear 102, 103 → gear 110 → Kia 1
08 (large gear 108a, small gear)→Switch to a high speed gear train with a small reduction ratio consisting of cam gear 109. The two gear trains are set so that the cam gear 109 always rotates clockwise no matter which direction the charge motor M1 rotates.

The first shutter charge lever 118 is rotatably supported on a shaft 125 mounted on the base plate 117, a rotatable roller 119 is attached to one end of one lever by a shaft 118a, and one end of the other lever is A cam 118b is formed. The roller 119 slides on a cam surface on the outer periphery of the cam 113 of the cam gear 109, and provides the first shutter charge lever 118 with rocking motion that follows the cam displacement of the cam surface. This swing also causes the cam 118b to swing. The second shutter charge lever 120 is rotatably supported by a shaft 127 mounted on the base plate 117, and has a roller 121 whose rotation axis is the shaft 120a.

The roller 121 is engaged with the cam 118b, and the swinging of the first shutter charge lever 118 allows the second shutter charge lever 120 to swing. and,
The second shutter charge lever 120 charges a known shutter mechanism (not shown).

The lever 122 is used to charge a known aperture adjustment mechanism, mirror elevating mechanism, lens aperture drive mechanism, etc., and is rotatably supported by a shaft 126 set on the base plate 117. A rotatable roller 123 is attached to the shaft 1 at one end.
22a, and this roller 123 engages with the cam 118c of the first shirt charger 8-118.

Therefore, the shi/< knee 122 also swings following the swinging of the Ml shutter charge lever 118 to charge the aperture adjustment mechanism, mirror lifting mechanism, etc.

SO is a contact piece member that is fixed to the cam gear 109 and constitutes a switch with a pulse signal board (not shown) consisting of a comb-like conductive pattern, and detects a moment before the charging is completed by the charge motor Ml.

Sl is also a similar contact member that forms a switch with the pulse signal board fixed to the cam gear 109, and is used to detect the completion of charging by the charge motor M.

FIG. 7 shows details of the hoisting motor M2 and the hoisting transmission system 2.

Binion gear 201 is secured to the output shaft of hoist motor M2 located within spool arrangement 22. The gear 202 is a two-stage gear including a large gear 202a' and a small gear 202b, and is rotatably supported.

The large gear 202a meshes with the pinion gear 201. The gear 203 is a two-stage gear having a large gear 203a and a small gear 203b, and is rotatably supported.

Large gear 203a meshes with small gear 202b. gear 20
4 is a two-stage gear having a large gear 204a and a small gear 204b, which are rotatably supported, and the large gear 204a is connected to the small gear 204b.
It meshes with 03b. A planetary lever 219a is further rotatably supported on the central axis of the second gear 204 by a bearing 219b, and a compression spring 22G is disposed between the small gear 20.4b and the bearing 219b, and the compression spring 22G is arranged between the small gear 20.4b and the bearing 219b, and 2
04a into frictional contact. Due to this frictional contact, the gear 219a rotates in accordance with the direction of rotation of the gear 204. On the planetary lever 219a, there is a two-stage gear 205 having a large gear 205a and a small gear 205b.
A two-stage gear 208 having a large gear 208a and a small gear (not shown) fixedly formed below the large gear 208a is rotatably attached. There is a two-stage gear 2 near the gear 205.
06, and a large gear 206a and a small gear 206b are independently rotatably supported. However, a coil spring 215 is arranged between the large gear 206a and the small gear 206b to provide a one-way clutch function, and one end of the coil spring 215 is fixed to the post 206c of the large gear 206a. As the small gear 206b rotates clockwise, the coil spring 215 tightens the shaft of the small gear 206b and rotates the small gear 206b as a unit.
The tin rocket configuration 2 is constantly engaged with the shaft 216.
Rotate 9. Sprocket configuration 29 is sprocket 1
-29a, 29b and shaft 29c. A pulse signal board P2 whose entire circumference is divided into 12 equal parts is fixed to the gear 207, and when the sprockets 29a and 29b rotate once, 12 pulses are obtained via the contact piece member S2. Therefore, the sprockets 29a and 29b have 6 teeth, and in a 35mm full-size camera, 4/3 of a turn is 1/3 turn.
Since the film is fed in frames, the number of pulses obtained via the contact member S2 is 16. Needless to say, it is possible to arbitrarily select an equal number of pulse signal substrates P2.

A two-stage gear 209 is arranged near the gear 208, has a large gear 209a and a small gear 209b, and is rotatably supported. The spool gear 210 is fixed to the spool 211 of the spool configuration 22 and rotatably supported, and is always engaged with the small gear 209b.The spool 211 has a rubber member 211a around its surface that promotes automatic winding of the film. It is pasted. Further, a cover 212 is disposed near the outside of the spool 211 and is rotatable by a shaft 213 provided on the fixed part of the camera.
4 to the spool 211 side, and has the function of promoting automatic winding of the film onto the spool 211. Note that although only one set of the cover 212, shaft 213, and spring 214 is illustrated, another set is arranged on the opposite side.

The rotation of the sprocket 29b is transmitted to the gear 217 by the coupled shaft, and further transmitted to the detection gear 218 that meshes with the gear 217. The ratio of the number of teeth between gear 217 and detection gear 218 is 3:4. A pulse signal board P3 that generates one pulse per rotation is fixed to the gear 218, and the pulse is obtained via the contact members S3 and S4. The armature member S3 is provided a predetermined phase ahead of the armature arm S4, and the drive of the hoisting motor M2 is switched to duty drive by the pulse output from the armature member S3 to lower the rotation speed. When the winding motor M2 is braked by a pulse from the contact member S4, it is stopped quickly.

If the winding motor M2 is controlled by a pulse generated during one rotation of the detection gear 218, one frame of film will be fed in a 35 mm full size camera. Naturally, the ratio of the number of teeth between the gear 217 and the detection gear 218 is set to 3:2, or the ratio of the number of teeth remains at 3:4,
If the pulse signal board P3 is divided into two equal parts and one pulse is generated every 180 degree rotation, the amount of film feed per time can be reduced to half size. Further, in this case, if the winding motor M2 is stopped when two pulses are counted, it is possible to make the film feed amount the full size. Furthermore, by making it possible to switch the number of pulses counted between 1 and 2, full size and half size can be easily accommodated.

Transmission of the rotational force of the hoisting motor M2 will be explained. When the winding motor M2 rotates counterclockwise, each part rotates in the direction of the solid arrow, and the gear 204 rotates clockwise to rotate the planetary lever 219a clockwise, causing the small gear 205 to rotate clockwise.
b is engaged with the large gear 206a, and the gear 208
The small gear meshes with the large gear 209a. Therefore, the rotation of the hoisting motor M2 is as follows: Binion gear 201→Gear 7202 (large gear 202a, small gear 202b)→Gear 203 (large gear 203a, small gear 203b)→Gear 20
4 (large gear 204a, small gear 204b) → gear 205
(Large gear 205a, small gear 205b) - Gear 206 (Large gear 206a, Small gear 206b) → Gear 207 → Sprockets 29a, 29b are transmitted at a low speed reduction ratio, and gear 204 (Large gear 204a, Small gear 204b)
) → Gear 208 (large gear 208a, small gear) → Gear 2
09 (large gear 209a, small gear 209b)-+ Spool gear 210→Transmitted to spool configuration 22 at a low speed reduction ratio.

On the other hand, when the winding motor M2 is rotated clockwise, each part rotates in the direction of the dotted arrow, the gear 204 rotates counterclockwise, rotates the planetary lever 219a counterclockwise, and rotates the large gear 205a. It meshes directly with the spool gear 210. Therefore, pinion gear 201 → gear 2
02 (large gear 202a, small gear 202b) → gear 20
3 (large gear 203a, small gear 203b) →Gear 20
4 (large gear 204a, small gear 204b) → large gear 20
5a→Switch to a high-speed transmission system with a small reduction ratio consisting of spool gear 210. In addition, sprocket) 29a,
The transmission system to 29b is cut off, and the subroket) 29a, 29
b becomes free to rotate.

As described above, the transmission system of the spool configuration 22 directions of the hoisting motor M2 can obtain two types of reduction ratios depending on the rotational direction of the hoisting motor M2. Specifically, a low speed reduction ratio is obtained when rotating counterclockwise, and a low speed reduction ratio when the hoisting motor M2 rotates counterclockwise. A clockwise rotation results in a high speed reduction ratio. However, in either direction of rotation, the spool arrangement 22 always rotates counterclockwise.

Note that during automatic film loading, the winding motor M2 is rotated counterclockwise, the reduction ratio of 2 in the winding transmission system is switched to the low speed side, and the tin rocket structure 29 and the spool structure 22 are rotationally driven at low speed. . At the time of frame advance after each subsequent shot, if the single-shot high-speed mode or quick-shot high-speed mode is set, and under normal conditions, the winding motor M2 is rotated clockwise and connected to the winding transmission system. 2 is switched to the high speed side, and only the spool structure 22 is driven to rotate at high speed.

During frame feeding, when the reduction ratio is automatically switched from high speed to low speed according to the power supply state or load state, the winding motor M2 is rotated counterclockwise, and the sprocket structure 29 is rotated counterclockwise.
Both the spool configuration 22 and the tin rocket configuration 29 are rotationally driven, but since the reduction ratio of the transmission system is set so that the circumferential speed of the spool configuration 22 is greater than the circumferential speed of the tin rocket configuration 29, the tin rocket configuration Since 29 is driven by the film being wound onto spool arrangement 22, there is no problem. Thus, the sprocket arrangement 29 drives the film only when the film is not being wound by the spool arrangement 22, but otherwise follows the film regardless of the direction of rotation of the wind motor M2.

FIG. 8 shows details of the rewind motor M3 and the rewind transmission system 3.

The pinion gear 301 is the output of the rewinding motor M3. r! A two-stage gear having a 7*092 small gear 302b is rotatably supported, and the large gear 302a meshes with the pinion gear 301. The gear 303 is a two-stage gear having a large gear 303a and a small gear 303b, and is rotatably supported.
is engaged with the small gear 302b, the planetary lever 306 is rotatably supported on the same axis as the gear 303, and the compression spring 30
5 is disposed between the small gear 303b and the planetary lever 306 to bring the planetary lever 306 and the large gear 303a into frictional contact. Due to this frictional contact, the planetary lever 306 rotates in accordance with the direction of rotation of the gear 303. A large gear 304a and a small gear 3 are attached to the tip of the planetary lever 306.
A two-stage gear 304 having 04b is rotatably attached. The gear 307 is attached to one end of the shaft 307b with a screw 307a, and the fork 308 is attached to the other end of the shaft 307b. The fork 308 is arranged to protrude into the cartridge storage chamber 310 and is configured to mesh with a winding shaft of a film cartridge (not shown). axis 30
A coil spring 309 is disposed between the receiving washer 307c on the film cartridge 7b and the fork 308, and the fork 308 can be temporarily retracted so that the film cartridge can be easily stored in the cartridge storage chamber 310. There is.

When the rewind motor M3 rotates clockwise, the gear 303
rotates clockwise to rotate the planetary lever 306 clockwise to engage the small gear 304b with the gear 307,
Therefore, pinion gear 301 → gear 302 (large gear 30
2a, small gear 302b) - gear 303 (large gear 303a)
, small gear 303b)→gear 304 (large gear 304a, small gear 304b)→gear 307→fork 308. On the other hand, when the rewind motor M3 rotates counterclockwise, the planetary lever 306 rotates counterclockwise, the meshing between the small gear 304b and the gear 307 is broken, and one rotational force is transferred to the fork. Therefore, by rotating the rewind motor M3 slightly counterclockwise, the winding load is transferred to the rewind transmission system 3 and the rewind motor M3 when the film is wound by the winding motor M2. You can avoid adding
Film winding under low load becomes easy.

Figure 9 shows a microcomputer COM as control means 2.
A specific example of an electric circuit in which this is used is shown below.

The light receiving element SPC receives reflected light from the subject, and inputs the received light signal to an operational amplifier OP1 having a high input impedance and having a compression diode Di connected to a feedback circuit. The operational amplifier OPI outputs logarithmically compressed object brightness information By via a resistor R1. Variable resistors VR1 and VH2 connected to constant voltage source Gl output film sensitivity information Sv and aperture value information Av. The operational amplifier OP2 to which the resistor R2 is connected to the feedback circuit has the shutter time information Tv=(B
y+5v-Av) and output. The shutter speed information Tv is converted into a 4-bit digital value by the A/D converter ADC, and is displayed on the viewfinder display device DSP via the decoder driver DCD, and is also input to the microcomputer COM's input capo (PGO-PO2). do. In addition, the 4-bit code 0001 to 1000
], /l corresponds to OOO seconds to 1/8 seconds, and codes 0000 and 1001 or more correspond to warning display elements.

When the S1 stroke switch swl connected to the input port PF7 is turned on by the first stroke of the release button, the potential of the output port PE3 becomes high level, so the transistor TRI is turned on by the inverter 1 and the resistor R3. The voltage from the battery vbt is supplied to each circuit as the power supply voltage Vcc. The arrow ↑ in the figure refers to Vcc, and is applied to circuit blocks that are not marked with the arrow ↑, such as operational amplifiers and A/D converters. Naturally, the power supply voltage Vcc is also supplied to the terminals and the like. Note that another power supply voltage VDD is supplied to the microcomputer COM, decoder LDEC, and display LCD.

A capacitor Cr is connected to the terminal R3T of the microcomputer COM, and a crystal oscillator QZ is connected to the terminals XO and Xi.
is connected, power supply voltage VDD is applied to terminal ■DD,
Terminal GND is grounded.

The input capo-h PAO-FA3 includes a second stroke switch sw2 that is turned on by the second stroke of the release button, a mirror-up switch Sw2 that is turned off when the mirror is up and turned on when the mirror is down, and a mirror-up switch Sw2 that is turned on when the mirror is down. A leading curtain switch swcNl that turns off and turns on when charging is completed, a trailing curtain switch 5wCN2 that turns off when trailing curtain travel is completed and turns on when charging is completed are connected, respectively.

The input port PFO-PF4 includes a first film switch swFLM1 consisting of a pulse signal board P2 and a contact member S2 (FIG. 7), a pulse signal board P3 and a contact member S3.
(Fig. 7) A second film switch swFLM2 consisting of
, a third film switch swFLM3. consisting of a pulse signal board P3 and a contact member S4. The first charge switch swcGEl consists of a pulse signal board and a contact piece SO fixedly attached to the cam gear 109 (Fig. 6), and is turned on just before charging is completed; The second charge switch swCGE2, which is turned on upon completion, is connected. Further, a self-drive switching switch 5wM0DE is connected to the input capacitor PF5, which is turned off when the self-timer mode S is set and turned on when the drive mode D is set. Input port PF6 has self-second time (2 seconds, 1 second) in self-timer mode S.
0 seconds) or a push button type selection switch swSTEP that is pressed when a mode (single shooting high speed, quick shooting high speed, quick shooting low speed) in drive mode D is selected is connected. The self-drive changeover switch 5wM0DE and the selection switch 5w5TEP correspond to the setting means 1 in FIG. 1, and are provided at a position on the camera body that is easy to operate, for example, on the front right side of the lens.

Output ports PE0-PE2 include transistors TR2-T.
The base of R4 is connected, and the transistors TR2 to TR4
controls the energization of the first clamping magnet MGO1 made of permanent magnet material that starts the mechanical release operation; the leading curtain magnet MCI that causes the leading curtain to run; and the trailing curtain magnet MCI that causes the trailing curtain to run.

A drive circuit DR2 that drives the hoisting motor M2 is connected to the output ports PBO and FBI, and the output ports PCO and P
A drive circuit DR3 for driving a rewind motor M3 is connected to ct, and a drive circuit DRI for driving a charge motor M1 is connected to output ports PDO and PDl.

The drive circuits DRI-DR3 have the same circuit configuration, and the circuit configuration is shown in FIG. A 2-bit signal is input to input terminals A and H. First, if A=l and B=0, the signal at input terminal B is inverted by inverter IIO, so the output of AND gate A12 becomes 1, the output of OR gate 0RIO also becomes 1, and transistor TR32 turns on. . Further, since the output of the inverter I13 becomes O, the transistor TR31 is also turned on. Therefore, the power supply voltage Vcc is applied to the motor M, a current flows, and the motor M rotates in a predetermined direction.

With A=O and B=1, the signal at input terminal A is inverted by inverter Ill, so the output of AND gate AIO is 1, the output of OR game hOR11 is also 1, and inverter I
12 becomes O, the transistor TR3
0, TR33 is turned on, current flows in the opposite direction to the motor M, and the motor M rotates in the reverse direction.

When A=l and B=1, the output of AND gate All is 1
, the outputs of the OR gates 0RIO and 0RII also become 1, so that the transistors TR32 and TR33 are turned on.

Therefore, if this mode is set while the motor M is rotating, the diodes DIO, Dll and the transistors TR32, TR33 will cut off the current flow, and the current will be cut off regardless of which direction the motor M is rotating. is short-circuited, and a brake is applied to the inertial rotation of motor M.

If A=O, B=O, AND gate AIO~A12
All outputs become 0, and transistors TR3O-TR
33 are all turned off, and the motor M is in an open state.

Returning to the explanation of FIG. 9. The output port PLO-PL3 outputs a 4-bit binary signal from the register RL in the microcomputer C0M, and the output port CLKOUT outputs a low frequency signal of about 2 Hz, which is obtained by dividing the fundamental frequency of the crystal oscillator QZ. Outputs the clock pulse. Decoder LDEC is connected to these output ports, and decoder L
The DEC is connected to a display device LCD composed of liquid crystal or the like. The display device LCD is provided on the top surface of the camera body or inside the viewfinder.

FIG. 11 shows details of the decoder LDEC and the display LCD. The decoder LDEC includes a 2iii-16ii decoder DEC', an AND gate A21. It consists of A22, OR gate 21, and 0R22. Binary-hexadecimal decoder D
The EC converts the binary 4-bit signal into a hexadecimal signal as shown in FIG. 12, and the display device LCD lights or blinks the display elements L1 to L5 in response to the hexadecimal signal input. Blinking of the display element L1 indicates a single-shot automatic shift, and blinking of the display element L2 indicates a quick-shot automatic shift. The OR gate 0R22 may be connected as shown by the dotted line in FIG. 11, and the automatic speed change may be displayed by blinking the display element L3.

The operation of the microcomputer COM will be explained with reference to flowcharts shown in FIGS. 13-15.

The microcomputer COM operates by being supplied with the electric FA voltage van. A basic clock is supplied from the crystal oscillator QZ, and at the same time a power-on reset is applied by the capacitor Cr.

The built-in program counter is initially set to O#i, and the program starts from the start. Further, it is assumed that the O1 output port for each flag is also O.

[Step 1] Input capo) PF7 input (hereinafter referred to as P
The same applies to the other boat (F7 human-powered boat)), and when the first stroke switch SW1 is on, the process proceeds to step 2, and when it is off, the process proceeds to the mode processing shown in FIG. 15.

[Step 2] A high level signal is output from the output capacitor PE3, the transistor TRI (FIG. 9) is turned on, and the power supply voltage Vcc is supplied to each part.

[Step 3] PA large input is input. If each part is fully charged and the photographer presses the second stroke of the release button, PAO=PA1=PA2=PA
Since 3=0, the PA large input hexadecimal value becomes OOH. If the FA large input is OOH, enter the release sequence and proceed to step 4; otherwise, return to step l.

That is, when only the first stroke switch swl is on, steps 1 to 3 are repeated to perform photometry and display.

[Stella 7'4] 4 by A/D converter ADC
The apex value Tv of the shutter speed converted into a digital value of bits (PG input is input to the microcomputer C
It is stored in register RG inside OM.

[Step 5] Data of the 4th beat and 2nd bit of the internal register RL of the microcomputer COM (see Figure 12)
branch instruction. If the data of the 4th bit is 1, it is self-timer mode, so proceed to step 6.
If it is 0, proceed to step 9.

[Step 6] Branch instruction based on the data of the 1st bit of register RL. If the 1st bit data is O,
Since the self-timer seconds is 10 seconds, proceed to step 7, and if it is 1, the self-timer seconds is 2 seconds, so
Proceed to step 8.

[Step 7] Count 10 seconds with a timer.

[Step 8] The timer measures 2 seconds.

[Step 9] The PEO output is set to 1, the transistor TR2 (FIG. 9) is turned on, and the first clamping magnet MGO is energized from the capacitor CO charged to approximately the same voltage as the power supply voltage Vcc. This activates the mechanical release operation. Thereafter, a waiting time TIMEI is created using a fixed time timer. Due to time-up, P
The EO output is set to 0 and the energization of the first clamping magnet (MGO) is released. This waiting time TIMEI may be set to be slightly longer than the minimum time during which the first tensioning magnet MGO is energized. At this point, a well-known mechanical sequence of aperture down and mirror up is entered.

[Step 1O] This is a routine to wait for a time until the mirror is raised. When the mirror is raised, the process advances to step 11. This routine is provided to operate the shutter after confirming that the mirror is up.

[Step 11] Determine flag FO. FO:1 represents the end of film.

[Step 12: Determine flag F1. F1=O represents recognition of film stop at the completion of winding.

[Step 13] The contents of the register RG, which stored the shutter time in Step 4, are converted into data in a multiple series value. Since the value stored in register RG has been logarithmically compressed, this is a routine for expanding the data to match the actual control value.

[Step 14] Set the PEI output to 1 and energize the front curtain magnet 1-MC1. At this stage, the leading curtain starts running.

[Step 15] A real time count is performed using the data expanded in Step 13, and the calculated shirt time is measured.

[Step 16] Set the PE2 output to 1, energize the trailing curtain magnet MG2, and run the trailing curtain. with this,
Focal brain shutter control ends. The time T required for the trailing curtain to complete its run using a fixed timer
Create I ME 2, then set PE1=PE2=O, and set the leading curtain magnet MCI and the trailing curtain magnet) MG2.
De-energize.

[Step 17] This is a routine that waits for the trailing curtain switch 5wCN2 to be turned off, that is, the trailing curtain running is completed. When running is completed,
Proceed to step 18.

Step 18] Determine whether the contents of register RL are less than 2 or greater than 2. From Fig. 12, if it is less than 2, it is either single shooting high speed mode or continuous shooting high speed mode.
In either case, the speed reduction ratio is high, and the process proceeds to step 19. If it is 2 or more, the speed reduction ratio is low, so the process proceeds to step 22.

[Step 19] By setting PDO=O and PDl=1, the drive circuit DRI is operated and the charge motor M1 is rotated in a direction in which the reduction ratio of the charge transmission system Kl (FIG. 6) becomes high speed.

This allows the shutter, mirror, automatic aperture, etc. to be charged at high speed.

[Step 20] By setting PBO=O and PB1=1, the drive circuit DR2 is operated, and the hoisting motor M2 is rotated in a direction in which the reduction ratio of 2 (FIG. 7) in the hoisting transmission system becomes high speed. This allows the film to be wound at high speed.

[Step 21] A constant PI for a high speed reduction ratio is stored in a register RP related to duty control immediately before the completion of hoisting, and a constant M1 for a high speed reduction ratio is stored in a register RM related to detection of a decrease in hoisting speed.

[Step 22 PDO=1. By setting PD1=0, charge motor M1 is connected to the charge transmission system.
Rotate in the direction that reduces the speed reduction ratio.

[Step 23] PBO=1. By setting PB1=O, the hoisting motor M2 is rotated in a direction in which the reduction ratio of 2 in the hoisting transmission system becomes low.

[Step 24] Store constant P2 for low speed reduction ratio in register RP, and store constant M for low speed reduction ratio in register RM.
Memorize 2.

[Step 25] Set a constant RI to register RD related to the detection of winding speed decrease during the duty control period, set constant S to register R3 related to the authorized time of film stop, set the contents of register RM to register RMM, and set register RFP.
For example, in the case of a high-speed reduction ratio, the contents of register RMM are stored as a constant M.
1, and in the case of a low speed reduction ratio, the constant M2 becomes constant.

Flag FO=F2=0. Set F1=1.

Setting Fl=1 means that the winding operation will start now. Flag F2 is the first film switch swF
It represents the on/off state of LM1.

[Step 26] Timer TM for timer interconnected
Set a constant K to R. The value of K is determined by the film winding speed, the equal fraction of the pulse signal board P2 (FIG. 7) of the first film switch swFLM1, and the microcomputer C.
It is a constant determined by the OM instruction cycle time.

Start timer TMR for timer interconnected. It also allows timers to be interacted with. (EN
T) Since the timer TMR has started, from now on, the timer TMR will start decrementing independently from the main program routine, and will be interoperated at fixed intervals (depending on the constant K), so that the dedicated timer interface can be accessed from the running program. Jump to Loved Address. Here, timer interrelated processing will be explained with reference to FIG. 14.

"Timer interwoven processing A [Step 101] Stop the decrementing operation of timer TMR and prohibit interworking.

[Step 102] Input the PF2 manual power from the third film switch SWFLM3, which is turned on each time the winding of one film frame is completed. Here, it is assumed that the winding motor M2 has already been driven in step 20 or 23, and that the third film switch FLM3 is turned off at the first timer interaction, and the process proceeds to step 103.

[Step 103] A branch is performed by the PFI input from the second film switch SWFLM2, which is turned on before the winding of one frame of film is completed. The second film switch swFLM2 is provided to decelerate the winding motor M2 immediately before the winding is completed and to improve the accuracy of stop control. In this embodiment, the deceleration is performed by duty control. It is also possible to perform deceleration. If the winding is not just about to be completed, the process advances to step 104.

[Step 104] Branching is performed by the PFO input from the first film switch swFLM1, which is repeatedly turned on and off during film winding. Now, PFO=0
Assuming that, the process proceeds to step 105.

[Step 105] Determine flag F2. Since F2=0 is set in step 25, the process advances to step 106.

[Step 106] The contents of register RMM are subtracted by 1, and the contents are stored in register RMM again.

[Step 107] Determine RMM=O. In the program up to now, RMM=M1 (M2)-1, so if the constant M1 (M2) is a relatively large value, it will not become O, so the process proceeds to step 108.

[Step 108] Reset the constant K in the timer register, start timer TMR, and enable timer-interrupted processing.

[Step 109] Return to the original program being executed.

In the timer-interrupted process, the three film switches SwFLMl, sw are activated from the running program at regular intervals.
The purpose is to determine the status of FLM2 and SWFLM3 (7). Since each instruction of the program itself is executed at a very high speed, it is assumed that there is virtually no problem by inputting the film winding information at regular intervals.

Now, suppose that the first film switch swFLM1 is turned off in a certain timer-interrupted process, step 104
The process then proceeds to step 110.

[Step 110] Determine whether flag F2=1. Since F2=O was set in step 25, the process advances to step 111.

[Step 1111 Set flag F2 to 1. This means that the first film switch s wF LM l has been turned off, that is, PFO=1.

[Step 112] If it is determined in step 105 that F2=1, the flag F2 is set to O in order to match the contents of the flag F2 with the ON state of the first film switch swFLM1.

[Step 113] Register RMM again
Set the contents of M. Thereafter, proceed to step 108,
Execute the routine described above. Assume that the winding has been executed for a while, and now it is just before the trunk winding. At this time, the second film switch SwFLM2 is turned on, so P
F1=O, and from step 103 to step 114
Proceed to.

[Step 114] Determine whether the contents of register RFP are smaller than a constant P or greater than P. Register RFP is used to adjust the duty ratio of duty control. As explained in steps 21, 24.25, initially the contents of register RFP are constant Pi (for high speed reduction ratio)
or P2 (for low-speed reduction ratio), and these values are set larger than the constant P, so step 11 is initially performed.
Proceed to step 5.

[Step 115] PBO=1. Set PBl=1. As a result, the winding motor M2 is energized and de-energized, and the brake is applied.

[Step 116] Subtract 1 from the contents of register RFP and store the value in register RFP again.

[Step 117] Subtract 1 from the contents of register RD and store the value in register RD again. Register RD is used to detect the end of the film during the duty control period, and is set to a constant value in step 25.

The constant value is set to a somewhat large value.

[Step 118] Determine whether the contents of register RD are O. Since it is not O at first, the process advances to step 108 and the above-mentioned routine is executed.

After performing several timer-interrupted processes, if the contents of register RFP become smaller than the constant P, step 11
4, the program branches to step 119.

[Step 119] Determine whether the contents of register RL are smaller than 2 or greater than or equal to 2. Referring to Figure 12, 2
If it is smaller than 2, it is a high speed reduction ratio, so go to step 120; if it is 2 or more, it is a low speed reduction ratio,
Proceed to step 121, respectively.

[Step 120] By setting PBO=O, PBl; 1, 1 hoisting motor M2 is connected to 2nd hoisting motor M2 in the hoisting transmission system.
The gear is rotated in the direction where the reduction ratio (Fig. 7) becomes high speed to perform high-speed winding.

[Step 121] PBO=1. By setting PB1=O, the hoisting motor M2 is connected to the hoisting transmission system.
The gear is rotated in the direction where the reduction ratio becomes lower, and low-speed winding is performed.

[Step 122] Determine whether the contents of register RFP are O. If not, proceed to step 116 and execute the routine described above. When it becomes 0, the process advances to step 123.

[Step 123] Register RP to register RFP
(constant P1 or P2) is stored again.

In this way, the duty control is performed by putting the value in the register RFP and setting it once every timer interrupt (every fixed period of time).
When the contents of the register RFP are constant 2 or more, the power to the hoisting motor M2 is cut off and the brake is applied. When it is smaller than the constant P, current is applied to the hoisting motor M2, and when it becomes O, the register is The method is to enter the original value into the RFP and repeat it. Therefore, the duty ratio is
It is determined by the constant of the timer TMR and the constant P1 or P2 set in the register RFP, and does not depend on the on/off state of the first film switch swFLM1.

In addition, at high speed reduction ratio and low speed reduction ratio, step 21
．． Since the contents of the register RP are changed in step 24, the duty ratio can be selected independently. Furthermore, if the constant P2 is set to a value smaller than the constant P, for example O, the process will always proceed from step 114 to step 119, so duty control can be avoided at low speed reduction ratios.

Now, the deceleration rotation of the hoisting motor M2 continues to be performed, and 1
When the frame winding is completed, the third film switch swFL
M3 turns on. At this time, the timer-interrupted process branches from step 102 to step 124.

[Step 124] PBO=1. Set PB1=1. As a result, the energization of the hoisting motor M2 is cut off and the brake is applied.

[Step 125] Similar to step 119, it is determined whether the contents of the register RL are less than 2 or greater than or equal to 2.

When the reduction ratio is high, the process proceeds to step 126, and when the reduction ratio is low, the process proceeds to step 127.

[Step 126] The constant 51 for high-speed reduction ratio is subtracted from the contents of the register RS that were first set to the constant S in step 25, and the result is stored in the register R3 again. The register RS is used to set the certified times T1 and T2 from the stop signal of the winding motor M2 to the time when the film is recognized as stopped at a high speed reduction ratio and a low speed reduction ratio.

[Step 127] Similarly to step 126, subtract the constant 32 for low speed reduction ratio from the contents of register R3,
It is stored in register R3 again.

[Step 128] Determine whether the contents of register R3 are less than 1 or greater than or equal to 1. If it is 1 or more, it means that the certified time T1 or T2 has not passed yet.
Proceed to step 108 and execute the routine described above. 1
If it is smaller, it means that the certified time T1 or T2 has elapsed, and the process proceeds to step 129.

[Step 129] It is determined that the film has completely stopped, and the flag F1 is set to 0.

Regarding steps 124 to 129, since the inertia of the hoisting transmission system is different between high speed reduction ratio and low speed reduction ratio,
Although the stabilization time from when the stop signal of the winding motor M2 (step 124) is issued until the film completely stops varies, the recognized time from the stop signal of the winding motor M2 until the film is recognized as stopped is correspondingly different. T1. T
2 (from step 124 to step 129) are made different by separately determining the constants Sl and S2. Therefore, at a high speed reduction ratio with low inertia, it is possible to recognize that the film has stopped in a shorter time than at a low speed reduction ratio with high inertia, and it is possible to proceed to the next operation.

After step 129, the process returns to step 109 to return to the program being executed. Here, since step 108 is not passed, no timer interaction occurs thereafter.

Next, let us consider a situation where the power supply voltage decreases while the winding motor M2 is being driven, or the film winding speed decreases due to a temperature change even though a high speed reduction ratio is set.

As the film winding speed decreases, the time interval at which the first film switch FLMI is turned on and off becomes longer. However, since the timer interrupt takes a certain period of time, step 105 or step 11
The number of routines that proceed from 0 to step 106 increases, and finally the contents of register RMM become 0. In this way, an abnormally slow film winding speed is detected. In this case, proceed from step 107 to step 130.
The value of the register RM that initializes the register RMM needs to be determined independently for the high speed reduction ratio and the low speed reduction ratio because the film winding speed is different, so a different constant Ml is set in step 21.24. , M2.

The timeout routine for detecting abnormally low film winding speed, which consists of steps 104 to 107 and 110 to 113, is not used during the duty control period. The reason is that the last step 116 of the duty control routine
, 123, if this timeout routine is continued, the number of program steps for timer-interrupted processing will increase, and the time required to return to the main routine will become longer.For example, the timing of applying the brake of charge motor M1 will be delayed. This is because problems may occur in the program being executed. Therefore, during the duty control period, when the entire duty control period becomes longer than the time depending on the initial setting constant of the register RD, film winding is performed by steps 117 and 118, which constitute the abnormally low speed detection process of the duty control period. If an abnormally low speed is detected, the process branches to step 130.

[Step 130] It is determined whether the contents of the register RL are smaller than 2 or greater than 2, that is, whether the reduction ratio is high or low. When the reduction ratio is high, the process proceeds to step 131, and when the reduction ratio is low, the process proceeds to step 132.When the reduction ratio is high, the process proceeds to step 132.
When the film winding speed decreases, film winding becomes possible by switching the reduction ratio from high speed to low speed. If the film winding speed decreases at a low speed reduction ratio, as long as the power supply voltage that allows exposure control of the camera is maintained, assuming there is sufficient film winding ability at the low speed reduction ratio, only when the film ends becomes.

[Step 131] Second charge switch C, GE
Determine the PF4 manual power that indicates the state of 2. If charging has not been completed, the process advances to step 133; if charging has been completed, the process advances to step 134.

[Step 132] When you have proceeded to this step,
This is the case when the film winding speed is low at a low speed reduction ratio and the film has finished, as explained in step 130. Therefore, PBO=O,P
By setting Bl=O, both terminals of the hoisting motor M2 are opened. Also, a flag FO is set to 1 to indicate the end of the film. After this, the process proceeds to step 109, so no timer interaction is required from this point on.

[Step 133] Since the charging is not completed, by setting PDO;l and PDl=Q, the charge motor M1 is rotated in the direction of switching the reduction ratio of the charge transmission system Kl (Fig. 6) to a low speed. , charges at low speed.

[Step 134] By setting PBO=l and PBl=O, the hoisting motor M2 is rotated in the direction of switching the reduction ratio of 2 (FIG. 7) to a low speed in the hoisting transmission system.
Wind up at low speed.

[Step 135] Since the reduction ratio was automatically switched from high speed to low speed in steps 133 and 134, the third bit of register RL (FIG. 12) is set to 1 to change to automatic speed change mode. At the same time, the contents of register RL are outputted from output ports PLO to PL3 to decoder LDEC. As a result, the display element L1 or L2 (FIG. 11) of the display device LCD flashes to indicate that the automatic transmission mode has been switched.

Since the reduction ratio has been switched to low speed, constant P2 for low speed reduction ratio is set in register RP, and register RFP is initialized to constant P2. Similarly, set constant M2 for low speed reduction ratio in register RM, and set register RMM to constant M2.
Initialize to .

Also, register RD is initialized to a constant value. Next, the process advances to step 108 and the routine described above is executed.

The above-described timer-interrupted processing is always executed from step 26 of the main routine to step 12 of the next photographing, and accurately executes film winding control.

Returning to the description of the main program routine.

[Step 27] First charge switch swCGEL
Determine the PF3 manual power connected to.

Just before charging is complete, press the first charge switch sw.
Wait until cGE1 is turned on and proceed to step 28.

[Step 28] It is determined whether the contents of the register RL are smaller than 2 or larger than 2, that is, whether the reduction ratio is high or low.

If it is a high speed reduction ratio, go to step 29.

When the speed reduction ratio is low, the process proceeds to step 30, respectively.

[Step 29] Since this is a high speed reduction ratio, the charge motor M1 is energized and then cut off, and the brake is applied.

This is to prevent charge motor M1 from continuing to rotate due to inertia and overcharging if the brake is applied to charge motor M1 when charging is completed, since charging is performed at high speed. The brake is applied so that the charging system stops exactly when charging is complete.

[Step 30] The second charge switch s indicates that charging of the shutter, mirror, automatic aperture, etc. is completed.
Wait for the O signal from wCGE2 to be input, and then proceed to step 31. Of course.

Timer-interrupted processing is performed many times while waiting for charging to complete.

[Step 311 Set PDO=PD1=1.

As a result, the charge motor M1 is de-energized and the brake is applied.

[Step 32] A flag FO indicating the end of the film is determined. Assuming that the film has not yet finished, the process proceeds to step 33.

[Step 33] Determine whether the contents of the register RL are 1, that is, whether or not the continuous shooting high speed mode is in effect.If it is the 0M shooting high speed mode, jump to NEXT (step 3). From step 3, the shooting sequence proceeds as described above, but what should be noted here is the film stop recognition (flag F l =
The problem is that the first clamping magnet MGo is energized in step 9 without checking O). In other words, the aperture down and mirror up operations, which are not directly related to actual photographing, are executed independently of the film stop when the first winding is completed, thereby speeding up the process. Thereafter, in step 10, mirror up is confirmed, and in step 12, confirmation of film stop at the completion of winding is confirmed. Up to this point, the timer interrupt has been repeated many times, and if the film has been recognized as stopped when winding is completed, the process proceeds to the next shutter opening control. If not, step 11.
12 loops are repeated, and the process waits for the film to be stopped in the timer-interrupted process. The above is the routine for continuous shooting high speed mode.

[Step 34] In cases other than continuous shooting high-speed mode, the film is stopped until the film is recognized as being stopped at the completion of winding (the flag Fl is
) until becomes O.

[Step 35] It is determined whether the contents of the register RL are 5, that is, the automatic speed change mode for quick shooting. If you are in continuous shooting automatic speed change mode, jump to NEXT (steer 3). Otherwise, proceed to step 36.

[Step 36] Determine whether the contents of the register RL are 2, that is, the low-speed snapshot mode. If it is continuous shooting low speed mode, jump to NEXT. Otherwise,
Proceed to step 37.

[Step 37] Determine whether the 4th bit of register RL is 1, that is, self-timer mode. If in self-timer mode, jump to NEXT. Otherwise, proceed to step 38. The self-timer mode has the same routine as the continuous shooting low-speed mode.

[Step 38] Determine PF7 manual power indicating the state of the first stroke switch SW1, wait for the first stroke switch swl to turn off, and return to 5TART. This step comes in case of single shooting high speed mode or single shooting automatic transmission mode, so the first stroke switch s
Wait until wl is turned off, that is, the release button is released.

In this way, when shooting continuously and the reduction ratio is low, unlike when using a high reduction ratio, the camera can be Abnormal movements can be prohibited. In other words, during continuous shooting at a low speed reduction ratio, it takes a relatively long time to confirm that the film has stopped, so if you start the release sequence without confirming that the film has stopped, the shutter will open only after the mirror has been raised. This takes too much time and gives the photographer an unusual feeling, but steps 34 to 36 can prevent this.

Next, let us consider a case where the film ends midway through winding.

In this case, the flag FO=1 in the time interwoven process, so the process branches from step 32 to step 39.

[Step 39] Set PCO=O, PCI=1,
The rewind motor M3 is energized via the drive circuit DR3 to start rewinding.

[Step 40] Set constant M3 in register RM.

[Steps 41-48] Steps 104- in Fig. 14
The program is similar to the program for detecting film movement explained in 107, 110 to 113, and when rewinding is completed, the first film switch sw F L M 1
This is a program that detects when the on/off state is no longer reversed, and when rewinding is completed, the process advances to step 49.

[Step 49] Set PCO=1 and 1 rewind motor M
Stop the rotation of step 3.

[Step 50] A flag FO indicating the end of the film is reset to O.

[Step 51] Set the third bit of register RL to O. In other words, if automatic gear shifting has been performed, automatic gear shifting is canceled upon completion of rewinding.

This is because the photographer originally set the mode to single-shot high-speed mode or quick-shot high-speed mode, and if the film is changed or the external environment (especially temperature) changes, the next time the film is taken, the film will be advanced at a high speed reduction ratio. This is because it is more effective to return to the initial setting mode. After this, return to 5TART.

Next, during continuous shooting at a high speed reduction ratio, charging of the shutter, mirror, and automatic diaphragm is completed early, winding is not yet completed, and after the first tension magnet MGO for the next shooting operation is energized in step 9, Consider the case where the film ends.

In this case, the mechanical release operation is activated by the first tensioning magnet MGO, so the aperture is narrowed down and the mirror is raised, but the film stops midway through winding and is not wound any further. film switch sw
FLM3 remains off. Therefore, if the film is rewound in this state, the photographer may misunderstand that the shutter is open and may perform an incorrect operation. Furthermore, if strong light rays enter through the lens, there is a risk of fogging the film. Therefore, it is best to lower the mirror and then rewind the film.

After checking the mirror up in step 10, step 1
1. While waiting for the film stop certification at the completion of winding at 12,
When the end of the film is detected by time interwoven processing,
In order to set the flag FO=1 in step 132, the process branches to step 52 in step 211.

[Step 52] Set PDO=l and PO2-4, and rotate the charge motor M1 in a direction in which the reduction ratio of the charge transmission system Kl becomes low. The rotation direction of the charge motor Ml may be switched according to the set mode.The program jumps to step 30, confirms the completion of charging, and proceeds to steps 31, 32, and 39, and performs rewind control. to go into.

"j mode processing" In step 1 of Fig. 13, the first stroke switch swl is
When it is determined that the switch is off, the mode processing shown in FIG. 15 is performed.

[Step 150] Set output port PE3 to O. This turns off transistor TRI (M9IN) and turns off power supply voltage Vcc. It4 light is stopped and power is saved. Note that the power supply voltage vI)D is alive.

[Step 151] Self-drive selector switch 5
Determine PF5 manpower from wM0DE. If it is the drive mode, the process goes to step 152, and if it is the self-timer mode, the process goes to step 163.

[Step 152] Determine whether the 4th bit of register RL is 1. If it is 1, it was in self-timer mode until then, so proceed to step 153 and set it to 0.
Since it was the drive mode at the time, the process advances to step 155.

[Step 153] When this step is reached, it means that the photographer has switched the self-drive changeover switch 5wM0DE from the self-timer mode to the drive mode. Therefore, the contents of the register RL are set to O to set the first drive mode, that is, the fluorophore freeze mode.

[Step 154: Output the contents of register RL]
It is output from PLO-PL3 and displayed on the display device LCD. Then, return to 5TART.

[Step 155] Determine the PF6 manual power from the selection switch 5w5TEP. When PF6=1, the self-drive changeover switch SWMODE is also selected as the selection switch 5w5.
TEP also means there is no change, so return to 5TART. When PF6=O, the selection switch 5w5TEP is pressed, so the process advances to step 156.

[Step 156] The third bit of register RL is 1,
That is, it is determined whether or not automatic gear shifting is being performed.

If the automatic transmission is in effect, the process proceeds to step 157; if not, the process proceeds to step 158.

[Step 157] Performs an AND operation on the contents of register RL and 1, and stores the result in register RL again. This is equivalent to setting the 2nd bit, 3rd bit, and 2nd bit of the 4th beat to 0, and is for canceling automatic gear shifting. Therefore, the photographer only needs to press the 1 selection switch swSTEP once to manually cancel the automatic gear shift. This point, together with step 135, is a feature of the present invention.

[Step 158] If the automatic gear shift is not set, the contents of the register RL are incremented by 1 and stored again.

[Step 159] Determine whether the content of register RL is 3. Since RL=3 is not assigned to any mode, becoming 3 means that one cycle of drive modes has been completed. If it is 3, the process proceeds to step 160; if it is not 3, the process proceeds to step 161.

[Step 160] Set the contents of register RL to O.

Steps 158, 159, and 160 are single-shot high-speed mode →
Continuous shooting high speed mode → continuous shooting low speed mode, select switch 5w
This means switching every time 5 TEP is pressed.

[Step 161] Output the contents of register RL.
It is output from PLO-PL3 and displayed on the display device LCD.

[Step 162] Wait until the selection switch 5w5TEP is released from the press and return to 5TART.

[Step 163] Self-drive selector switch 3
Even when WMODE is off, it is determined whether the 4th bit of register RL is 1 or not.

When the value is 1, the process goes to step 165 because the self-timer mode has been in effect until then, and when it is 0, the process proceeds to step 164 because it is the drive mode.

[Step 164] When this step is reached, it means that the photographer has switched the self-drive changeover switch 5wM0DE from the drive mode to the self-timer mode. Therefore, the contents of the register RL are set in OAH in hexadecimal notation to set the first mode of the self-timer modes, that is, the self-timer 10-second mode.

[Step 165] Selection switch s wS TE P
Determine the PF6 human power from. When PF6=1, it means that neither the self-drive selector switch 5wM0DE nor the selection switch swSTEP changes.
Return to 5TART. When PF6=O, select switch 5
Since w5TEP has been pressed, the process advances to step 166.

[Step 166] If the contents of register RL are OAH, proceed to step 167; otherwise, proceed to step 168.
, respectively.

[Step 167] A hexadecimal code OBH representing the self-timer 2-second mode is stored in the register RL.

[Step 168] The hexadecimal code L! indicating the self-timer 10-second mode is written in the register RL. o Memorize AH.

Steps 166, 167, and 168 are self-timer 10
This means that the second mode and the self-timer 2 second mode are switched each time the selection switch 5w5TEP is depressed.

(Effects of the Invention) As explained above, according to the present invention, the gear ratio of the transmission system is switched from the high speed side to the low speed side in response to a decrease in the rotational speed of the motor, and the switched gear ratio is maintained until the end of the film. A control means for maintaining the gear ratio and an operation means for returning the gear ratio that has been switched to the low speed side to the high speed side are provided. In addition to fixing the gear ratio to the low speed side by operating the operating means, the noise and time loss associated with automatic gear shifting of the transmission system can be minimized, and the gear ratio of the transmission system can be fixed to the low speed side. can be returned to the high-speed side at will.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing a part of the operation of the embodiment of the present invention,
3 is a time chart showing signals of each part of the embodiment shown in FIG. 1, FIG. 4 is a front view showing a camera in which the embodiment shown in FIG. 1 is embodied, and FIG. 5 is a plan view, Fig. 6 is a perspective view showing the charge transmission system, Fig. 7 is a perspective view showing the winding transmission system, Fig. 8 is a perspective view showing the unwinding transmission system, and Fig. 9 is a perspective view showing the rewinding transmission system.
The figure is a circuit diagram showing a microcomputer and peripheral circuits.
FIG. 10 is a circuit diagram showing a drive circuit, FIG. 11 is a block diagram showing a decoder and display, FIG. 12 is a diagram showing mode codes, and FIGS. 13 to 15 are flowcharts. DESCRIPTION OF SYMBOLS 1... Setting means, 1a... Setting button, 2... Control means, 2a... Register, 3... Display means, 4・・・・・・Drive circuit,
5...Switching means, 6...High speed transmission system,
7... Winding load, 8... Film,
9...Detection means, 10...Low speed transmission system, M2...Hoisting motor, K2...Hoisting transmission system, DRI to DR3...・Drive circuit, C
OM・・・・・・Microcomputer, 5vrsTE
P...Selection switch.

Claims (1)

[Claims] 1. In an electric drive device for a camera that includes a motor and a transmission system that has at least two speed ratios and switches between the speed ratios, the speed ratio is changed from a high speed side to a low speed side in response to a decrease in the rotational speed of the motor. An electric drive for a camera, characterized in that it is provided with a control means for switching the gear ratio to the lower speed side and maintaining the switched gear ratio until the end of the film, and an operating means for returning the gear ratio that has been switched to the lower speed side to the higher speed side. Device.