JPS62295034A - Film feeding device - Google Patents

Abstract

PURPOSE:To always keep film feeding speed at a fixed value without being affected by power supply conditions, film load conditions and the number of fed frames by controlling an effective voltage to be applied to a feed motor in a speed control section based on the moving speed information and photographed frame number information of a film. CONSTITUTION:A speed control section for controlling the speed of the film 6 while applying driving force to a motor 3 at every feeding of one frame of the film 6 and the following braking section are provided. The film feeding device is provided with a frame number detecting means 8 for finding out photographing frame number information, a speed detecting means 11 for finding out the moving speed information of the film 6 and a control means 1 for controlling an effective voltage to be applied to the motor 3 in the speed control section based on the frame number information obtained from the means 8 and the speed information obtained from the means 11. Thereby, the film feeding speed immediately before braking can be controlled even if a mechanical winding stop member is especially provided. Consequently, the film feeding speed of each frame can be fixed and useless power consumption can be prevented.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a film feeding device that feeds a film using a motor as a drive source.

(Prior Art) In recent years, film feeding devices that feed film using a motor as a drive source have become common. For example, in many cameras, the winding and rewinding of film is motorized using a motor, greatly improving operability. Here, when winding the film of the camera (when loading the film, the film is wound completely and then rewound one frame at a time to take pictures, when rewinding the film) - the amount of film feed per frame. is not constant due to fluctuations in power supply conditions, film load conditions, etc., resulting in a problem in which the screen spacing of the film varies.

JP-A-60-123838 as an improved proposal
number is known. The motor rotation control device according to this proposal generates pulses with a constant width at a period corresponding to the rotation speed of the motor, and when the motor is rotating at high speed, the duty ratio of the current flowing to the motor is small. When the motor is rotating at a low speed, the rotation of the motor is feedback-controlled so that the duty ratio of the current applied to the motor is increased. However, in this conventional proposed method, the reduction gear ratio of the feed transmission system apparently changes depending on the number of film frames to be fed (or the number of frames to be taken in a type that winds one frame at a time for each shot). This creates a problem in that the film stopping position changes depending on the number of frames being fed.

(Object of the Invention) An object of the present invention is to provide a film feeding device that can always maintain a constant film feeding amount without being affected by power supply conditions, film load conditions, or the number of frames fed.

In order to achieve the above object, the present invention provides a speed control section such as a tutee drive and a subsequent braking section for each frame of film feeding, based on film movement speed information and shooting frame number information. The film feeding device is characterized in that the effective voltage applied to the feeding motor in the speed control section is controlled.

(Example) Examples of the present invention will be described below with reference to the drawings. 1st
The figure shows a winding transmission system. A binion gear 201 is fixed to the output shaft of a film feeding motor M2 disposed within the spool arrangement 22. The gear 202 is a two-stage gear having a large gear 202a and a small gear 202b, and is rotatably supported, and the large gear 202a meshes with the pinion gear 201. The gear 203 has a large gear 203a and a small gear 203b.
A large gear 203a is rotatably supported by a stepped gear and meshes with a small gear 202b.

The gear 204 is a two-stage gear having a large gear 204a and a small gear 204b, and is rotatably supported, and the large gear 204a meshes with the small gear 203b. A planetary lever 219a is further rotatably supported on the center axis of the second gear 204 by a bearing 219b, and a compression spring 220 is disposed between the small gear 204b and the bearing 219b, and the compression spring 220 is arranged between the small gear 204b and the large gear 204a. make frictional contact. This frictional contact causes the planetary lever 219a to rotate in accordance with the direction of rotation of the gear 204. On the planetary lever 219a, there is a two-stage gear 20 having a large gear 205a and a small gear 205b.
5 and a two-stage gear 208 having a large gear 208a and a small gear (not shown) fixedly formed below the large gear 208a are rotatably attached.

A two-stage gear 206 is arranged near the gear 205, 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 boss 206C of the large gear 206a.
With the clockwise rotation of a, the coil spring 215 tightens the shaft of the small gear 206b, causing it to rotate together. The gear 207 is constantly engaged with the small gear 206b and causes the shaft 216 to rotate the drive sprocket 29a. gear 20
A pulse substrate P1 whose entire circumference is divided into 12 equal parts is fixed to 7, and when the driven sprocket 29a rotates once as the film F is wound, 12 pulses are obtained via the contact piece member S1. Therefore, the drive sprocket 29a has 6 teeth (which mesh with the perforation Fa of the film F), and in a 35 mm full-size camera, one frame of film is fed by 4/3 rotation.
The number of pulses obtained via the contact piece Sl is 16.

Needless to say, it is possible to arbitrarily select equal numbers of pulse substrates P1.

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 has a spool configuration 22
It is fixed to the spool 211 of the spool 211, is rotatably supported, and always meshes with the small gift 209b. A rubber member 211a on the surface of the spool 211 promotes automatic winding of the film F.
is pasted all around. Furthermore, a cover 212 is disposed near the outside of the spool 21'l and is rotatable by a shaft 213 provided on the fixed part of the camera. It functions to promote automatic winding on 211. Note that the cover 212) shaft 213 and spring 214
Although only one set is shown, another set is arranged on the opposite side.

The sprocket 29b is driven only by the film F (specifically, the perforation Fa of the film F), and its rotation is transmitted to the gear 217 by the connected shaft, and the detection gear 218 that meshes with the gear 217.
transmitted to. The ratio of the number of teeth between gear 217 and detection gear 218 is 3:4.

A pulse board P2 that generates one pulse per rotation is fixed to the gear 218, and the pulse is obtained via the contact members S2 and S3. The contact piece member S2 is the contact piece member S3
It is provided a predetermined phase before the contact piece member S.
When the drive of the film feeding motor M2 is switched to duty drive by the first pulse output from the contact member S3, the rotation speed is lowered, and the brake is applied to the film feeding motor by the second pulse from the contact piece member S3. I try to stop it immediately.

When the film feeding motor M2 is controlled by the pulses generated during one rotation of the detection gear 218, 35 mm
With a full-frame camera, one frame of film is fed. Naturally, gear 217 and detection gear 2
Either set the ratio of the number of teeth of 18 to 3:2, or keep the ratio of the number of teeth at 3:4, divide the pulse board P2 into two equal parts, and generate 1 bus/Lz bus every 180 degree rotation. In this way, the amount of film feeding at one time can be set to half the size. Also,
In this case, if the film feeding motor M2 is stopped when two pulses are counted, it is possible to increase the film feeding amount to 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 film feeding motor M2 will be explained. When the film feeding 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 205b to become the large gear 206a. At the same time, the small gear of the gear 208 is meshed with the large gear 209a. Therefore, the rotation of the hoisting motor M2 is as follows: pinion gear 201 → gear 202 [large gear 202a, small gear 2
02b) →Gear 203 (large gear 203a, small gear 20
3b) →Gear 204 (large gear 204a.

Small gear 204b) → gear 205 (large gear 205a, small gear 205b) → gear 206 (large gear 206a, small gear 206b) → gear 207 → drive sprocket 29a at a large reduction ratio. Gear 204a.

Small gear 204b) - + Gear 208 (Large gear 208a
+ small gear) → gear 209 (large gear 209a, small gear 20
9b) → Spool gear 210 → Spool arrangement 22 is transmitted with a large reduction ratio.

On the other hand, when the film feeding motor M2 is rotated clockwise, each part rotates in the direction of the dotted arrow, and the gear 204 rotates counterclockwise to rotate the planetary lever 219a counterclockwise. As a result, the shaft 208b of the gear 208 comes into contact with the fixed stopper 250, and the planetary gear 208. 205
does not mesh with the subsequent gears (206, 209) and no longer transmits power. If the film is rewound in this state, both the spool structure 22 and the sprocket 29a will be in a free state, so that the film can be rewound with a light force. In addition, if rewinding is not performed in this manner, not only will the rewinding load become large since the film feeding motor M2 will be rotated through the film F during rewinding, but the circumference of the spool structure 22 will also be increased for automatic film loading. Since the speed is higher than that of the sprocket 29b, the film F may get stuck in the spool chamber (not shown) during rewinding, which may damage the emulsion surface of the photographed film. After film rewinding is completed, when the next film is loaded, the film feeding motor M2 is rotated counterclockwise and the winding transmission system rewinds the film.

FIG. 2 shows details of the rewind motor M3 and the rewind transmission system.

Pinion gear 301 is fixed to the output shaft of rewind motor M3. The gear 302 includes a large gear 202a and a small gear 30.
The large gear 302a meshes with the pinion gear 301, which is rotatably supported by a two-stage gear 2b. gear 303
is a two-stage gear having a large gear 303a and a small gear 303b, which is rotatably supported, and the large gear 303a is connected to the small gear 302b.
meshes with The planetary lever 306 is rotatably supported on the same axis as the gear 303, and the compression spring 305 is connected to the small gear 303b.
,l! : Disposed between the planetary lever 306 and the planetary lever 306 and the large gear 303a to bring them into frictional contact. Due to this frictional contact, the planetary lever 306 rotates in accordance with the direction of rotation of the gear 303. 30 to planetary lever
6, a two-stage gear 304 having a large gear 304a and a small gear 304b 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. Fork 308 is cartridge storage chamber 31
0, and is configured to mesh with the winding shaft of the film cartridge. Receiver washer 30 on shaft 307b
A coil spring 30 is installed between 7c and the fork 308.
9 is arranged, and the fork 308 is arranged so that it is easy to store the film cartridge in the cartridge storage chamber 310.
can be temporarily evacuated.

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 303
a, small gear 303b) - gear 304 (large gear 304a.

The rotational force is transmitted from the small gear 304b) to the gear 307 and to the fork 308. On the other hand, when the rewind motor M3 rotates counterclockwise, the planetary lever 306 rotates counterclockwise, the engagement between the small gear 304b and the gear 307 is cut off, and the rotational force is transferred to the fork 308. I can't tell you until now. Therefore, by rotating the rewinding motor M3 slightly counterclockwise, the film feeding motor M3 can be rotated slightly counterclockwise.
When winding the film by 2, it is possible to prevent the winding load from being applied to the rewind transmission system 3 and the rewind motor M3, making it possible to wind the film with a low load.

The winding and unwinding transmission system shown in Figures 1 and 2 is as follows:
Depending on the rotation direction of the motor, the reduction ratio is switched by the planetary gear, or the transmission is disconnected.
A one-way clutch may be used to switch the reduction ratio according to switching of the rotational direction of the motor.

FIG. 3 is a perspective view of the shutter 25. 31 is a charge lever of the shutter unit 30, which is connected to the motor M1 in FIG.
is charged in the direction of the arrow.

32) 33 are magnet units for controlling the front curtain and the rear curtain, respectively. Power supply to these magnets is controlled by a control circuit to be described later, and when the magnets are energized, the leading and trailing shutter curtains run. Reference numeral 34 denotes an aperture portion, which is shielded from light by only the front shutter curtain when the shutter is fully charged, and is shielded from light by the rear shutter curtain in addition to the front shutter curtain when the shutter has completed running. In addition, both the front and rear shutter curtains are composed of a plurality of rectangular shutter blades, as shown in 35 to 38 in the figure, and static electricity and wind pressure due to friction during film feeding cause the shutter blades
5 to 38, but when the aperture section 34 is shielded from light from both the shutter front curtain and the shutter rear curtain, even if such a gap occurs, the photographing is extremely small.

FIG. 4 shows details of the charge motor Ml and the charge transmission system 1.

Pinion gear 101 is fixed to the output shaft of charge motor M1 and meshes with gear 102. Gears 102 and 103 constitute two-stage gears, and are rotatably supported by shafts 114 set on a base plate 117, respectively. The gears 102 and 103 each have protrusions 102a that alternately protrude in the thrust direction.
, 103a are formed, and this protrusion 102a.

Due to the nine fittings 103a, the gears 102 and 103 mesh and move 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 the 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 is rotatably supported by a shaft 115 mounted on the planetary lever 106, 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. When the gear 105 rotates counterclockwise (in the direction of the arrow), the planetary lever 1
06 rotates clockwise and the large gear 107a becomes the gear 105.
meshes with The gear 108 is connected to the shaft 1 mounted on the base plate 117.
108a, 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 constantly meshes with the gear 103.

When the gear 103 rotates counterclockwise and the planetary lever 106 rotates counterclockwise, the gear 110 becomes the large gear 108a.
meshes with 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. Gear 119a is always gear 10
8, and the transmission system from the pinion gear 101 to the cam gear 109 is switched depending on the rotational direction of the charge motor M1. That is, charge motor Ml
When rotates counterclockwise, each part rotates in the direction of the solid arrow, and as the planetary lever 106 rotates clockwise, pinion gear 101 → gear 102 . 103-gear 105→
Gear 107 (large gear 107a.

The transmission is switched to a low-speed gear train with a large reduction ratio, which includes the following: small gear) → gear 108 (large gear 108a, small gear) → cam gear 109. On the other hand, when the charge motor M1 rotates clockwise, each part rotates in the direction of the dotted arrow, and as the planetary lever 106 rotates counterclockwise, the pinion gear 101
→ Gears 102, 103 → Gear 110 → Gear 108 (large gear 108a, small gear) → Cam gear 109 The gear train is switched to a high speed gear train with a small reduction ratio. The two gear trains are set so that the cam gear 109 always rotates clockwise no matter which direction the charge motor Ml 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 a swing that follows the displacement of the cam surface. This swing also causes the cam 118b to swing. The second shutter charge lever 120 has a shaft 127 mounted on the main plate 117.
It has a roller 121 which is rotatably supported by a shaft and whose rotation axis is a 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 12
0 charges a known shutter mechanism (not shown).

The lever 122 is a lever that charges a known aperture adjustment mechanism, mirror elevating mechanism, lens drive mechanism, etc., and is rotatably supported by a shaft 126 set on the base plate 117, and one end of the lever is rotatably supported. A roller 123 is attached by a shaft 122a, and this roller 123 engages with a cam 118c of the first shutter charge lever 118. Therefore,
The lever 122 also swings following the swinging of the first shutter charge lever 118 to charge the aperture adjustment mechanism, mirror lifting mechanism, and the like.

SO is a contact piece member that forms a switch with a signal board fixed to the cam gear 109 and detects that the cam 113 is rotated by the charge motor Ml.

The relationship between the amount of film movement and the film movement speed under film feeding control in which a duty drive section is provided for film feeding (winding) will be explained with reference to FIG. 5(A).

First, when a is fully energized to the film feeding motor M2,
The moving speed increases and reaches a constant speed Va at the moving amount x1, and the motor rotates constantly. Then the amount of movement is X. However, motor M2
is driven on duty, decelerated, and the moving amount is Xs and the speed Vc
When the motor drive is stopped at this point, motor M2
overruns and stops at the moving amount Xa.

b in FIG. 5(A) is a case where the battery is exhausted and the power supply voltage is lower than a, and the speed vb during steady state and the speed Vd after duty drive are different from a. Therefore, the overrun amount is also different from a, and the film movement fiXb is different from a.
Stop at .

In order to keep the feed amount (movement amount) constant for each frame of film, it is necessary to keep the overrun plate constant.

If the number of frames to be photographed is not significantly different, the overrun plate is determined by the film moving speed when the motor drive is stopped.

Therefore, if the speed at which the motor drive is stopped is made constant, the overrun amount becomes constant.

For this purpose, the speed is reduced to a constant speed Ve in the duty drive deceleration section XO to Xs, as shown in FIG. 5(B).

In FIG. 5(B), in the duty drive section XO to Xs, the film movement speed a is decelerated from Va to Ve, and b is v
It is decelerating from b to Ve. In this section, the degree of deceleration is greater in a than in b.

In order to change the degree of deceleration in this manner, it is preferable to change the rate of energization of the duty. That is, when the moving speed during steady state is high and the degree of deceleration is to be increased, the ratio of duty energization may be reduced, and when the moving speed during steady state is slow and the degree of deceleration is to be reduced, the ratio of energization of the duty may be increased.

Next, using FIG. 6, the relationship between the number of photographed frames and the amount of overrun will be explained. This figure shows the relationship between the time T required for the film to move a certain amount and the overrun amount in film driving using one type of duty ratio, where a is the 1st frame and b is the 36th frame. It is a piece.

In the film feeding structure in which the film F is wound on the spool 22 as in this embodiment, as the number of frames to be photographed in one film increases, the spool diameter increases due to the wound film. As a result, the appearance is similar to that of the reduction ratio of the feed transmission system shown above. In other words, for the same film, at the first hook, T, = ta, and the amount of overrun were Ya, but as the number of frames to be shot increases, the film movement speed becomes faster, and as T1 becomes shorter, the amount of overrun increases. , at the 36th frame, T=tb, and the overrun amount is yb (ta>tb, Ya<Yb).

On the other hand, let T, (time spent moving a certain amount) -tc, and even if there is no change in this time, the amount of overrun is Yd for the lth hook, but as the number of frames increases, the amount of overrun increases. The amount decreases and becomes Yc at the 36th frame (
Yd>Yc).

FIG. 7 is a block diagram showing control of the film feeding motor in an embodiment of the present invention.

When an exposure completion signal such as a shutter trailing curtain run completion signal is generated, the control means 1 causes the drive circuit 2 to feed the film (
The winding motor rotates in one direction. This results in
The drive sprocket 4 and spool 5 begin to rotate, and feeding of the film 6 begins.

The feeding of the film 6 by the driving sprocket 4 and the spool 5 is controlled by the control circuit 1 so that the film feeding motor 3 is fully energized during the initial feeding period. During the full energized rotation of the film feeding motor 3, the rotational speed detection means 11 detects the moving speed of the film 6 by observing the rotational speed of the detection sprocket 9 driven by the film 6. I'll keep it. - When the rotational position detection means 10 which detects the rotational state of the detection sprocket 9 detects that the film 6 has been fed to the vicinity of the end of the frame (speed control section where the speed is controlled while applying driving force), the control means 1 switches the film feeding motor 3 to duty drive. However, the duty ratio is based on the number of photographed frames detected by the number of photographed frames detection means 8 and the film 6 detected by the rotation speed detection means 11.
is determined based on the moving speed information. That is, basically, if the moving speed of the film 6 is fast, the duty ratio is decreased to increase the deceleration, and if the moving speed of the film 6 is slow, the duty ratio is increased so as not to decelerate too much. Keep the feeding speed constant. or,
Apart from the above-mentioned condition of the moving speed of the film 6, the above-mentioned duty ratio is controlled by the information on the number of photographed frames. That is,
Even if the moving speed of the film 6 falls within the predetermined conditions, the apparent reduction ratio of the feeding transmission system will be larger when the projection frame is around the 36th frame than when it is around the 1st frame. Therefore, the duty ratio is increased (to make the effectiveness of the brake in the next step almost constant).

When the rotational position detection means 10 detects that the film 6 has been fed to the end position of one frame, the control means 1 applies a brake force to the film feeding motor 3 to stop feeding the film 6. let

Figure 8 shows a microcomputer COM as the control means l.
A specific example of an electric circuit in which this is used is shown below.

When the first stroke switch swl is turned on by the first stroke of the release button, the transistor TRI is turned on, and 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 of course the power supply voltage vC is applied to circuit blocks that are not marked with the arrow ↑, such as operational amplifiers and A/D converters.
C is supplied. Even after the first stroke switch swl is turned off, the power supply voltage Vcc is not supplied while a low level signal is applied to the base of the transistor TRI from the output capacitor (PE3) of the microcomputer COM via the inverter 11 and the resistor R3. Retained.

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 Vcc is applied to terminal VDD,
Terminal GND is grounded.

Input ports PA2 to PA3 are set to turn off when the leading curtain is completed.
A leading curtain switch swcN1 that is turned on when charging is completed, a trailing curtain switch 5wCN1 that is turned off when trailing curtain travel is completed, and turned on when charging is completed are connected, respectively.

The input ports PEO to PE4 are connected to a first film switch s w F L M 1 consisting of a pulse substrate P1 and a contact member St (FIG. 1), and a first film switch s w F L M 1 consisting of a pulse substrate P2 and a contact member S2 (FIG. 1). 2 film switch s w
FLM 2) Third film switch swFLM3 (outputs the 1-frame feeding complete signal) consisting of a pulse board P2 and a contact member S3, a signal board and a contact member fixed to the cam gear 109 (Fig. 4) A charge switch swCGE is provided in the cartridge storage chamber 310 and is turned on when charging is completed.
A cartridge storage switch swPTIN is connected, which is turned on when the cartridge is stored and turned off when it is not stored.

Transistors TR2 to T are connected to the output ports PEO to PE2.
The base of R4 is connected, and the transistors TR2 to TR4
controls the energization of the first tension 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 MG2 that drives the trailing curtain.

A drive circuit DR2 that drives a film feeding (winding) motor M2 is connected to the output ports PBO and FBI, a drive circuit DR3 that drives a rewind motor M3 is connected to the output ports PCO and Pct, and the output port PDO , P.D.
A drive circuit DRI for driving the charge motor M1 is connected to I. The drive circuits DRI to 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 B. First, A=1
．． If A=O, the signal at input terminal B is inverted by inverter 110, so AND gate A12
The output of the OR gate 0RIO becomes 1, the output of the OR gate 0RIO also becomes 1, and the transistor TR32 is turned on. Also, since the output of the inverter 113 becomes 0, the transistor TR
31 is also turned on. Therefore, motor M has power supply voltage V
cc is applied, current flows, and motor M rotates in a predetermined direction.

When A = O, B = 1, the signal at input terminal A is inverted by inverter 111, so AND gate A
The output of I O is 11 OR gate ○ The output of R11 is also 11
When the output of the inverter 112 becomes O, transistors TR30 and TR33 are turned on, current flows in the opposite direction to the motor M, and the motor M rotates in the opposite direction.

A=1. When B=1, the output of AND gate All is 1
, the outputs of OR gates oR10 and 0R11 also become l, turning on transistors TR32 and TR33.

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.

A=0. When B=O, AND gate AIO~AI2
All outputs become O, and transistors TR30 to TR
33 are all turned off, and the motor M is in an open state.

FIG. 10A shows the operation of the microcomputer COM.

This will be explained with reference to the flowcharts in FIGS. 10B and 11.

[Step 1] The microcomputer COM operates by supplying the power supply voltage Vcc in response to turning on the first stroke switch swl.

A basic clock is supplied from the crystal oscillator QZ, and at the same time a power-on reset is performed by the capacitor Cr. The built-in program counter is initially set to address O, and the program starts from the start. , It is also assumed that all flags are 01 and output ports are also 0.

[Step 2] Input from P2 to PA3 (input capo)
The same applies to other ports (hereinafter referred to as PA large input). If each part has been charged and the projector presses the second stroke of the release button, PA2=P
Since A3=0, the value is OOH in the PA large input IG decimal number.

[Step 3] If the PA large input is OOH, proceed to step 5; otherwise, proceed to step 4.

[Step 4] If the PA large input is not OOH now,
Let PE3 output be O. At power-on reset, all output ports are O, so this instruction is meaningless, but since the program may jump to step 1 midway through, it is meaningful at this time. (Latch release of power supply voltage Vcc) [Step 5] When the PA large input OOH occurs, that is, when the photographer presses the second stroke of the release button, the camera enters the shooting mode. The PE3 output becomes 1, keeps the transistor TRI on, and latches the power supply voltage Vcc.

[Step 6: Third film switch sw input to input port PE2 at the end of feeding (winding) at the front frame
Frame addition information from FLM3 (one-frame feed transmission signal) is transferred from accumulator A to internal register RGI.

[Step 7] By setting PDO=O and PD1=1, the drive circuit DRI is operated and the charge motor Ml is rotated. This charges the shutter, mirror, automatic aperture, etc.

[Step 8] The start timings of energization of the charge motor Ml and the film feeding (winding) motor M2 are shifted to create a waiting time for waiting for the current flowing through the charge motor Ml to become stable. This can prevent overcurrents (rush currents) during initial energization from overlapping.

[Step 9] PBO=0. By setting PB1=1, the drive circuit DR2 is operated to rotate the film feeding (winding) motor M2. This causes the film to wind up.

[Step 10] The pulse signal of the first film switch swFLM1, which inputs the movement (feeding) speed of the film F at the initial stage of rotation of the film feeding motor M2 in step 9 from the input port PFO, is set for a predetermined time. The value is determined by how many pulses are input within the range.

Then, the moving speed information of the film F is transferred from the accumulator A to the internal register RG2.

[Step 11] If the register RGI into which the number of film frames
), the process branches to step 13, while register RGI is 2.
If x is smaller than 5 (x<25), the process branches to step 12.

[Step 12] If register RGI is 11 or more and 24 or less (II≦X≦24), branch to step 14; on the other hand, if register RGI is smaller than 11 (x
<11), the process branches to step 15.

[Step 13] When the register RG2 containing the film movement (feeding) speed y is equal to or higher than the first predetermined speed 81 (Sl<y), set the register RG3 to 1;
On the other hand, if the speed is slower than the speed Sl (st>y), 2 is set in the register RG3.

[Step 154] When register RG2 is equal to or higher than the first predetermined speed S1 (Sl≦y), register RG3 is set to 2.
On the other hand, if the speed is slower than S1 (Sl>Y
), set 3 in register RG3.

[Step 15] Register RG2 sets the second predetermined speed S2 (speed S2 is slower than the above speed Sl, that is, S
l>32) or more (S2≦y), register RG3 is set to 3; on the other hand, if the speed is slower than S2 (s2>
y), set 4 in register RG3.

[Step 16] Set register RG3 to 1.

[Step 17] Set 2 in register RG3.

[Step 18] Set 3 in register RG3.

[Step 19 Set 4 in register RG3.

Step 6, 10. The purpose of the processing 11-19 is to set the value of the register RG3 based on the film frame number information and the film movement speed information. The value of register RG3 is used to determine the duty ratio of duty control immediately before film stop, which will be explained in detail later. That is, when 25≦X S1≦y, RG3=125
%G3-Tee drive 25riX Sl>y or 11≦X≦24 When S1≦y, RG3=2
When 50% duty drive 11<x<24 Sl>y or x<11 S2≦y, RG3=375
%G3-T drive When the apparent reduction ratio is small) and the film movement speed is high, the duty ratio is low. Conversely, when the number of film frames is small (the apparent reduction ratio is large) and the film movement speed is fast, the duty ratio is high. (including full energization).

Here, we will change the duty ratio in 4 stages with a duty ratio of 2.
Although it is performed every 5%, it is of course possible to configure the number of stages in various stages such as 2 stages, 3 stages, etc. It is also possible to configure it so that the duty ratio changes linearly in an almost analog manner. be. It is also obvious that the duty ratio can be set arbitrarily.

[Step 20] Flag FO=F2=F3=F4=
Set F5=O, F1=1, constant M in register RG-1
, set 1 to RG5.

Set a constant K to the timer included timer TMR. The value of K is the film winding speed, the pulse substrate P1 of the first film switch s w F L M 1 (the first
It is a constant determined by the equal fraction of the figure) and the instruction cycle time of the microcomputer COM. .

Start timer TMR. The (ENT) timer TMR that enables timer inclusion is started. From then on, the timer TMR is repeatedly decremented independently of the main program routine, and the timer TMR is incremented every fixed time (depending on the constant I) and is running. Jump from the program to the dedicated timer included address.Here, the timer included processing is performed as the first
This will be explained using Figure 1.

"Timer included processing" [Step 101] Decrementing and including the timer TMR is prohibited.

[Step 102] Branches depending on the value of flag F4.

When the flag F4-0 is set, the film winding is fully energized, and when the flag F4=1, it is the duty section.

Since F4=0 was set in step 80, step 103
Branch to [Step 103] First film switch swFL
Read the value of M1.

[Step 104 If PFO=1, go to 113 PFO=
If it is 0, proceed to 105 respectively.

[Step 105] Determine flag F2, Step 20
After setting F2=0, the process proceeds to step 106.

[Step 106] Set the contents of internal register RG4 to 1
decrease only.

[Step 107] Determine whether RG4=O. In the current program, RG4=M-1, so if M is a certain large value, it will not become O, so the process proceeds to step 108.

[Step 108] Second film switch SW
Receives PFI input from FLM2.

[Step 109] Determine whether RF1=O.

If the film has not been advanced to the point just before winding one frame, press R.
Since it is FI-1, the process advances to step 110.

[Step 11O] Reset the constant K in the timer register, start the timer TMR, enable inclusion, and return to the original execution program.

Timer-included processing is performed by setting three film switches swFLM1°s at regular intervals from the running program.
w F L M 2, S W F L M 3
The purpose is to make it difficult to determine the state of the 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.

Assuming that the first film switch is turned off in the current timer inclination process, the process proceeds from step 104 to step 113.

[Step 113] Determine flag F2. After setting F2=0 in step 20, proceed to step 114.

[Step 114] Set flag F2 to 1.

This means that the first film switch s w F L M 1 has been turned off, that is, PFO=1.

[Step 112] Constant M is set in internal register RG4 again.

The process then proceeds to step 108 to execute the aforementioned routine.

In the next timer inclination, in step 104, PF
Since O=1 and F2=1 in step 113, the process proceeds to step 106, where the value of the internal register is decremented by 1. Thereafter, the timer interaction is repeated using the routine described above.

Further, if the first film switch is turned on in the current included process, the process proceeds from step 104 to step 105.

In step 105, F2 is determined. In step 114, F2=
Since it is set to 1, the process advances to step 111.

[Step 111] Set the value of F2 to 0. Thereafter, the value of register RG4 is reset and the routine proceeds to the above-mentioned routine.

To summarize the operations of steps 104 to 107 and 111 to 114, if the value of the first film switch swFLM1 is different from the previous included process, the value of the flag F2 is reset to the constant M in the setting register RG4. If they are equal, the value of register RG4 is decremented. When the film is wound smoothly, the sprocket 29a also rotates and the first
Since the film switch swFLM1 is switched at approximately regular intervals, the value of the register RG4 does not become O.

However, if the film gets stuck at the end of the film, for example, when a 24-frame film is used and 24 frames have been taken, the film feed (winding) motor M2 tries to wind the film, but the film cannot move any further. Therefore, the on/off state of the first film switch swFLMl does not change. Therefore, the flag F2 is fixed to 1 or 0 and does not change, and in step 106, the contents of the internal register RG4 are decremented by 1, and the first film switch S
When W F L M 1 stops changing, the value of register RG li becomes 0 in the M-th timer included process.

Therefore, in step 107, the process proceeds to step 136.

[Step 136: Set PBO=O, PB1=O, and turn off the power to the film feeding (winding) motor M2.

[Step 137] Set flag FO-1. This indicates that the film has finished. Thereafter, the process returns to the original main routine, but since the timer inclination is still prohibited at 101, the timer inclination is no longer activated.

Assume that the film has been fed normally and is about to be wound one frame. At this time, the second film switch s w F L
M2 is turned on, so step 109 and step 1
Branch to 15.

[Step 115] Flag F4=1, register RG
The process proceeds to step 110 where 4 is set as the constant M1, and timer inclination setting is performed.

In the next included process, the flag is F4-1, so the process advances to step 116.

[Step 116] Register RG3 and register RG5
If the value of the register RG3 is smaller than or equal to the register RG5, the process proceeds to step 118; if the value is greater, the process proceeds to step 117.

[Step 117] PBO=1. With PB1=1, brake is applied to film feeding (winding) motor M2.

[Step 118] PBO=0. With PB1=1, the film feeding (winding) motor M2 is energized.

[Step 119] Add 1 to register RG5.

[Step 1203 When register RG5=5, proceed to step 121.

[Step 121] Set register RG5 to 1.

Therefore, register R is used for each timer included process.
G5 has a cycle of 1 → 2 → 3 → 4 → 1 → 2 →... (without repeating).

If the register RG3 is 1, the motor brake is applied in step 118 when RC,5=1, and in step 119 when the motor energization register RG5 is 2.3°4.

The film feeding (winding) motor M2 is in step 1.
Even if you apply the brakes at 17, it will not be able to stop immediately due to inertia and will continue to rotate.

The film feeding (winding) motor M2 is decelerated by repeatedly controlling the sequence of energization → brake → brake → brake → energization → . . . for each timer included. At this time, since the energization of the motor M2 occupies 25% of the time of the repetitive control, the motor M2 is driven at a duty ratio of 25%.

This situation is shown in FIG. 12A (a).

- Each film switch swFLM1, 2゜3 on the soil side
status is shown. In (a), switch s w
When FLM2 is turned on, the PBO waveform repeats high and low. When it is low, the film feeding (winding) motor M2 is energized, and when it is high, the motor brake is applied.

When register RG3=2, similarly drive at 50% duty ratio [(b) in FIG. 12(A)] Register RG3=3
When , the duty is driven at 75% [Figure 12 (A)
(C)] Also, when register RG3=4, step 1
At step 16, the process branches to step 118, resulting in full energization ((d) in FIG. 12(A)).

In this way] the register R set according to the number of film shooting frames and film movement speed information in step 6-1.
The duty ratio can be switched depending on the value of G5.

Steps 122-130 detect a change in the second film switch swFLM2 in exactly the same way as steps 104-108 and 111-114, and if there is a change, the constant Ml is reset in the register RG4, and there is no change. In this case, the value of the register RG4 is subtracted by 1, and if the second film switch swFLM2 does not change even after performing the timer included process M1 times, the routine branches to step 138. If the film is wound smoothly, the process advances to step 131.

[Step 131] Third film switch S.
Input V F L M 3 from PF2.

[Step 132] Third film switch s □,
When vFLM3 is off, that is, when PF2=1, the process proceeds to step 110, resets the timer included, and returns to the main routine. In this way, steps 116 to 132 are performed for each timer interwoven process, and the film is wound by duty drive.

Now, when the film is wound one frame, the third film switch S W F L M 3 will be turned on, so step 1
Proceed to 34.

[Step 134] Brake is applied to the film feeding (winding) motor M2 similar to step 117.

[Step 135] Set the flag F1-0.

This is a flag indicating completion of winding.

As in step 137, since the timer included is not reset, the timer included will not be applied again thereafter.

Next, a case will be described in which the film is not wound during the duty drive.

If the second film switch s w F L M 1 does not change (M) and the timer increment is performed once, the register RG4 is reduced to 0 and the step 1 is started.
30 and branches to step 138.

[Step 138] Set flag F5 to 'F5 by bird'
= 1, branch to step 143F in step 20
Since 5=O is set, the process advances to step 139.

[Step 139] If the value of register RG3 is 4, that is, full power is applied even in the duty section, Step 143
Proceed to.

Register RG3 is 1. 2. 3, step 140
Proceed to.

[Step 140] Add 1 to the value of register RG3.

In other words, the first stage duty ratio is increased.

[Step 141] Set flag F5 to 1.

Reset the constant Ml in the register RG4, set the timer included again, and return to the main routine.

Therefore, if the film stops moving for a certain period of time during duty drive, the duty ratio is switched to a higher duty ratio and duty drive is performed. If the film is wound with a large duty ratio, the third
The film switch s w F L M 3 is turned on and the process advances to step 134 to complete winding.

The situation at this time is shown in FIG. 12(B). Here, if the film is not wound even with a large duty ratio, the register RG4 is turned on again in step 129.
The value of becomes O, and in step 130, the process branches to step 138.

This time, since the flag F5 is set to 1 in step 141, the process branches to step 143.

[Step 143] Similarly to step 136, power to the film feeding (winding) motor M2 is turned off.

[Step 144] Set the film end flag FO to 1. After that, return to the main routine.

Therefore, if the film stops moving during duty drive, it will be driven again at a duty ratio that is one step higher, and if the film is still not wound, it will be determined that the film has finished.

Execute accurately.

Returning to the description of the main program routine.

[Step 21] Charge switch swC indicating that charging of the shutter, mirror, automatic aperture, etc. is completed
Input the signal from GE.

[Step 22] Together with step 21, a routine waits until charging is completed. Of course, during this time, the palindrome is also subjected to timer interwoven processing.

[Step 23] Set the PDO output to 1. This applies a brake to the charge motor ~11.

[Step 24] Determine the flag FO indicating the end of the film. Assuming that the film has not yet finished, the process proceeds to step 25.

[Step 25] Same as step 2.

[Step 27] Steps 24 to 27 are repeated until completion of winding is confirmed in the timer included process, that is, until F1=0. When winding is complete,
5TART Return to step 1, and in step 4 release the latch of the power supply voltage Vcc. When the first stroke switch swl is also off, the power supply voltage Vcc disappears.

(Shooting sequence ends) 1 rewind processing" If the film ends in the middle of being wound, the flag FO = 1 in the timer included processing, so step 2
- Branch from step 1 to step 28.

[Step 28] The PE2 output is set to 1, and the trailing curtain magnet MG2 is energized to run the trailing curtain.

[Step 29] A timer is used to create the time necessary for the trailing curtain to complete its travel.

[Step 30] PE2=0 and the trailing curtain magnet MG2 is de-energized. This prevents fogging of the film due to the photographer inadvertently removing the lens and irradiating the shutter curtain with strong light during rewinding. Since there is both a leading curtain and a trailing curtain at the aperture,
It can completely prevent light from entering the film surface.

[Step 31] Input the signal from the trailing curtain switch 5wCN2.

[Step 32] Wait for the completion of trailing curtain travel, and once completed, proceed to step 33.

[Step 33] Set PCO=O and PCI=1, and rotate the rewind motor M3.

[Step 34] Set internal register RG4 to Ml.

[Steps 35 to 43] Steps 102, 103, 105, 106, 1 in timer interwoven processing
This program is similar to the program for detecting film movement explained in 07゜115, 116, 117, and 120, and is a program that detects when the drive sprocket 29a stops rotating when rewinding is completed. Once completed, the process advances to step 44.

[Step 44] Set PCO=1 and stop the rotation of the rewind motor M3.

[Step 45: The flag FO indicating the end of the film is reset to 0.

[Step 46] Set PDO=O, PD1=1,
Rotate charge motor M1. This is because the trailing curtain is run in step 28 before rewinding, so the winding mechanism is returned to the fully charged state.

[Step 47] Input the signal from the charge switch swCGE.

[Step 48] Wait for charging to be completed and proceed to Step 4.

[Step 49: Stop the rotation of the charge motor Ml. This completes the rewinding process, and the 5TAR
Return to T (step l).

Next, another embodiment of the present invention will be explained with reference to FIG.

In this other embodiment, the speed control in the speed control section of the feeding motor M2 is not duty control, but voltage level (current level) control is used, and everything else is the same as the above embodiment. It is.

That is, in (a) of FIG. 13(A), a voltage level of 25% corresponding to the duty ratio drive of 25% in the above embodiment is shown.
Similarly, in (b), voltage level 5 is shown.
0%, (C) voltage level 75%.

(d) shows a state where the voltage level is 100%.

In this way, the voltage level can be switched according to the value of the register RG3 set according to the value of the power supply battery vbt.

Figure 12 (B) shows a voltage level of 25% in the speed control section.
If the film stops moving and a certain period of time elapses, the feeding motor M2 is driven at a higher voltage level.
That is, a state in which the voltage level has been switched to 50% is shown. If the film does not move even with this high voltage level driving force, this state is determined to mean that all frames of the film have been fed, and the power to the film feeding motor M2 is turned off.

[Modifications other than the examples]

The duty drive in the speed control section in the above embodiment was configured to repeat energization and braking of the feeding motor M2, but even if the duty drive is the same, it is configured to repeat energization and release. A similar effect can be obtained.

〔Effect of the invention〕

As explained above, the present invention allows the film feeding speed immediately before applying the brake to be controlled without the need to construct a mechanical winding member, making it possible to keep the film feeding amount constant for each gobo. In addition, it is possible to prevent selfless consumption of voltage. Further, in the present invention, it is possible to provide a film feeding device that can properly feed the film even if there is a drop in the power supply voltage or a change in the apparent reduction ratio.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a winding transmission system of a camera as an embodiment of the present invention. Figure 2 is the same (a perspective view showing the rewind transmission system of the camera. Figure 3 is a perspective view showing the rewind transmission system of the camera. Figure 4 is a perspective view showing the charge transmission system of the camera. ), (B) is a graph showing the relationship between film movement speed and film movement amount. Fig. 6 is a graph showing the relationship between the number of captured frames and the amount of overrun. Fig. 7 is a block diagram showing the operation of the camera. Fig. 8 is a circuit diagram showing a microcomputer and peripheral circuits. Fig. 9 is a circuit diagram showing a drive circuit. Figs. 10A, 10I3, and 11 are flowcharts. Fig. 12 (,・\), (B ) is a time chart. FIGS. 13(A) and (B) are time charts showing an embodiment of the present invention. ゛1... Control means 3 M2... For film feeding ( (For winding) Motor 4, 29a... Drive sprocket 5, 22... Spool 9, 29b... Detection sprocket 6, F... Film 8... Shooting frame number detection means 10. ...Rotational position detection means

Claims (2)

[Claims] (1) A motor is used as a drive source to feed the film, and each time a frame of film is fed, there is a speed control section in which the speed is controlled while applying driving force to the motor, and a subsequent brake section. In a film feeding device, a frame number detection means for obtaining photographic frame number information, a speed detection means for obtaining film movement speed information, and a frame number detection means for obtaining the frame number information obtained by the frame number detection means and the speed detection means for obtaining the film moving speed information. A film feeding device comprising: control means for controlling an effective voltage applied to the motor in the speed control section based on the determined speed information. (2) The film feeding device according to claim 1, wherein the speed control section performs duty driving of the motor, and the control of the effective voltage by the control means changes the duty ratio of the duty driving.