JPH0792583B2 - Film feeding device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a motor and a film feeding device that feeds a film as a drive source.

(Prior Art) In recent years, a film feeding device that feeds a film using a motor as a drive source has become popular. For example, in many cameras, motors have been electrically driven to wind and rewind the film to greatly improve operability. Here, when the camera film is wound up (when the film is loaded, the film is rewound one film at a time, the film is rewound one by one, the film is rewound). The amount is not constant due to fluctuations in power supply conditions, film load conditions, etc., and there has been a problem that the film screen intervals vary.

As an improved proposal of the related art, when winding (or rewinding) each frame of a camera, the film feeding motor is initially energized to full power, and then the duty is reduced to reduce the speed while applying a driving force to the motor. A speed control section for driving is provided, and an electric brake section is further provided after that.
There is a system that keeps the film feed rate constant. According to this method, deceleration can be appropriately performed before braking, so that the frame feeding amount can be made constant without providing mechanical winding stopping means, and the current consumption can be reduced to reduce battery consumption. The life of can be extended.

However, in the above-mentioned improved proposal, the motor drive force in the speed control section (duty drive) is constant at a level lower than full energization when it is regarded as an effective voltage, and the power supply voltage drops due to battery exhaustion or the like. If or
In the case where the film load becomes large, the motor stops in the speed control section, and the film cannot be fed for one frame.

Also, when the film feeding state is detected and the film is not fed even though the film is being fed, the completion of feeding all the film frames is detected, and the film feeding motor is detected. A device for stopping even one frame during feeding is conventionally incorporated in a camera. However, in such a camera, the motor is not operated in the speed control section due to the decrease in the power supply voltage and the increase in the film load as described above. Even if it is stopped, there is a problem that this is erroneously detected as the completion of feeding of all frames.

(Object of the Invention) It is an object of the present invention to provide a film feeding device which can make the film feeding amount constant and can perform the film feeding properly even if the power supply voltage is lowered or the film load is increased. To do.

In order to achieve the above object, the present invention provides a speed control section such as duty drive for each frame feed of the film, and a brake section after that, in the speed control section based on the voltage information of the power source. Control the effective voltage applied to the feeding motor, and detect the film feeding speed in the speed control section, and when the speed is less than or equal to a predetermined value, control the effective voltage to be large. The film feeding apparatus is characterized in that the feeding motor is stopped and controlled when the feeding speed is equal to or lower than a predetermined value.

Example An example of the present invention will be described below with reference to the drawings. First
The figure shows a winding transmission system. A pinion gear 201 is fixed to an output shaft of a film feeding motor M2 arranged in a spool structure 22. The gear 202 is a two-stage gear having a large gear 202a and a small gear 202b, is rotatably supported, and 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 by a large gear.
203a meshes with the 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 by the gear 204. The large gear 204a meshes with the small gear 203b. Two-stage gear 20
A planetary lever 219a is further rotatably supported by a bearing 219b on the central axis of 4, and a compression spring 220 is attached to the small gear 204b and the bearing 2.
It is arranged between the bearing 219b and the large gear 204a so as to make frictional contact with each other. This frictional contact causes the planet lever 219a to follow and rotate according to the rotation direction of the gear 204. On the planetary lever 219a, a two-stage gear 205 having a large gear 205a and a small gear 205b, and a large gear 208a and a two-stage gear 208 having a small gear (not shown) fixedly formed under the large gear 208a are rotatable. Attached to. 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, large gear 206a
A coil spring 215 for providing a one-way clutch function is arranged between the small gear 206b and the small gear 206b, and one end of the coil spring 215 is fixed to the boss 206c of the large gear 206a. The spring 215 tightens the shaft portion of the small gear 206b to rotate them integrally. Gear 207 is small gear 206
Always engaged with b and driven by shaft 216 Sprocket 29a
To rotate. The gear substrate 207 is fixed to the pulse substrate P1 whose entire circumference is divided into 12 equal parts, and when the drive sprocket 29a that is driven by the film F being wound up makes one revolution,
Individual pulses are obtained via the contact piece S1. Therefore, the drive sprocket 29a has 6 teeth (which mesh with the perforation Fa of the film F), and in the 35mm full size camera, the film for one frame is sent by 4/3 rotations thereof, so the contact piece member S1 is used. The resulting number of pulses is 16.
Needless to say, it is possible to arbitrarily select the equal fraction of the pulse substrate P1.

A two-stage gear 209 is arranged near the gear 208, and the large gear 20
It has 9a and a small gear 209b, and is rotatably supported. The spool gear 210 is fixed to the spool 211 of the spool structure 22, is rotatably supported, and constantly meshes with the small gear 209b.
On the surface of the spool 211, a rubber member 211a that promotes automatic winding of the film F is attached to the entire circumference. Further spool
A cover 212, which is rotatable by a shaft 213 provided on a fixed portion of the camera, is arranged near the outside of the 211, and the cover 212 is pressed toward the spool 211 side by a spring 214, so that the film F
Fulfills the function of facilitating automatic winding of the spool 211. Although only one set of the cover 212, the shaft 213 and the spring 214 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 coupled shaft, and further to the detection gear 218 that meshes with the gear 217. Transmitted. The ratio of the numbers of teeth of the gear 217 and the detection gear 218 is 3: 4. A pulse substrate P2 that generates one pulse per rotation is fixed to the gear 218, and a pulse is obtained via the contact piece members S2 and S3. The contact piece member S2 is provided before the contact piece member S3 by a predetermined phase, and the drive of the film feeding motor M2 is switched to the duty drive by the first pulse output from the contact piece member S2. The number of rotations is reduced so that the second pulse from the contact piece member S3 is used to stop the film feeding motor immediately before braking.

When the film feeding motor M2 is controlled by the pulse generated during one rotation of the detection gear 218, one frame of film is fed in the 35 mm full size camera. Naturally, the ratio of the number of teeth of the gear 217 and the detection gear 218 should be 3
If the ratio is set to 2 or the ratio of the number of teeth remains 3 to 4, the pulse substrate P2 is divided into two equal parts and one pulse is generated for each 180 degree rotation, so that the film feed amount per time is half. Can be size. Further, in this case, if the film feeding motor M2 is stopped when two pulses are counted, the film feeding amount can be made full size. Further, if the number of pulse counts can be switched between one and two, it is possible to easily cope with the full size and the half size.

The transmission of the rotational force of the film feeding motor M2 will be described. When the film feeding motor M2 rotates counterclockwise, each part rotates in the direction of the solid arrow, the gear 204 rotates clockwise and the planet lever 219a rotates clockwise, and the small gear 205b becomes the large gear 206a. While meshing, the small gear of the gear 208 is meshed with the large gear 209a. Therefore, the rotation of the hoisting motor M2 is performed by rotating the pinion gear 201 → gear 202 (large gear 202a, small gear 202b) → gear 203 (large gear 203a, small gear 203).
b) → gear 204 (large gear 204a, small gear 204b) → gear 205 (large gear 205a, small gear 205b) → gear 206 (large gear 206a, small gear 2)
06b) → Gear 207 → Transmitted to the drive sprocket 29a with a large reduction ratio and at the same time with the gear 204 (large gear 204a, small gear 20
4b) → gear 208 (large gear 208a, small gear) → gear 209 (large gear 209a, small gear 209b) → spool gear 210 → spool configuration
It is transmitted to 22 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 planet lever 219a counterclockwise. As a result, the shaft 208b of the gear 208 comes into contact with the fixed stopper 250, and the planetary gears 208 and 205 move to the subsequent gears (206 and 209).
Will not engage and will not transmit power. If the film rewinding is performed in this state, the spool structure 22 and the sprocket 29a are both in a free state, and thus can be rewound with a light force. If the rewinding is not performed in this way, the film feeding motor M2 is rotated through the film F in the rewinding, so that not only the rewinding load increases but also the rewinding load increases.
Since the peripheral speed of the spool structure 22 is set higher than that of the sprocket 29b for automatic film loading, the film F is dubbed into the spool chamber (not shown) at the time of rewinding, which damages the emulsion surface of the film already taken. There are things. After the film rewinding is completed, the film feeding motor M2 is rotated counterclockwise at the time of loading the next film, and the winding transmission system drives the film.

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

The pinion gear 301 is fixed to the output shaft of the rewinding motor M3. The gear 302 has a large gear 202a and a small gear 302b 2
A large gear 302a is rotatably supported by a stepped gear, and the large gear 302a meshes with the pinion gear 301. The gear 303 is a large gear 303a and a small gear 30.
2 stage gear with 3b, rotatably supported by large gear 303a
Meshes with the small gear 302b. The planetary lever 306 is rotatably supported on the same axis as the gear 303, and the compression spring 305 has a small gear 303b.
And the planetary lever 306, and the planetary lever 306 and the large gear 303a are brought into frictional contact with each other. This frictional contact causes the planetary lever 306 to follow and rotate in accordance with the rotation direction of the gear 303. A two-stage gear 304 having a large gear 304a and a small gear 304b is rotatably attached to the tip of the planetary lever 306. The gear 307 is attached to one end of a shaft 307b with a screw 307a, and a fork 308 is attached to the other end of the shaft 307b. The fork 308 is arranged so as to project into the cartridge storage chamber 310 and is configured to mesh with the winding shaft of the film cartridge. Washer 307c and fork 30 on shaft 307b
A coil spring 309 is arranged between the fork 8 and the fork 8 so that the forks 308 can be temporarily retracted for easy storage when the film cartridge is stored in the cartridge storage chamber 310.

When the rewinding motor M3 rotates in the clockwise direction, the gear 303 rotates in the clockwise direction to rotate the planetary lever 306 in the clockwise direction, and the small gear 304b meshes with the gear 307. Therefore, the pinion gear 301 → the gear 302 (Large gear 302a, small gear 302b) → Gear 303 (large gear 303a, small gear 303b) → Gear 304 (large gear 304
a, small gear 304b) → gear 307 → fork 308 and the rotational force is transmitted. On the other hand, when the rewinding motor M3 rotates in the counterclockwise direction, the planetary lever 306 rotates in the counterclockwise direction, the engagement between the small gear 304b and the gear 307 is broken, and the rotational force is changed to the fork 308. I can't tell you. Therefore, by slightly rotating the rewinding motor M3 in the counterclockwise direction, it is possible to prevent the rewinding transmission system K3 and the rewinding motor M3 from being applied to the hoisting load when the film is wound by the film feeding motor M2. It is possible to wind the film with a low load.

The winding and rewinding transmission system shown in FIGS.
Depending on the switching of the rotation direction of the motor, the reduction ratio is switched by the planetary gear or the transmission is disconnected.
The one-way clutch may switch the reduction ratio according to the switching of the rotation direction of the motor.

FIG. 3 is a perspective view of the shutter 25. Reference numeral 31 is a charge lever of the shutter unit 30, which is charged in the direction of arrow D by the motor M1 shown in FIG. Reference numerals 32 and 33 are front and rear curtain control magnet units, respectively. The energization of these magnets is controlled by the control circuit shown in FIG.
By energizing, the leading and trailing shutter curtains run.
Reference numeral 34 denotes an aperture portion, which is shielded by the shutter front curtain only when the shutter charge is completed, and is shielded by the shutter rear curtain in addition to the shutter front curtain when the shutter traveling is completed. In addition, both the front curtain and the rear curtain of this shutter are shown in Fig. 35.
It is composed of a plurality of rectangular shutter blades as shown in ~ 38, and a gap may occur between the shutter blades 35 to 38 due to static electricity or wind pressure due to friction during film feeding. In the state where the aperture portion 34 is shielded from both the rear curtain of the shutter and the gap, even if such a gap occurs, the influence is extremely small.

FIG. 4 shows details of the charge motor M1 and the charge transmission system K1.

The pinion gear 101 is fixed to the output shaft of the charge motor M1 and meshes with the gear 102. The gears 102 and 103 form a two-stage gear, and are rotatably supported by shafts 114 erected on a main plate 117. The gears 102, 103 are formed with protrusions 102a, 103a alternately projecting in the thrust direction.
The nine fittings of 103a allow the gears 102 and 103 to engage with each other in the rotation direction and interlock with each other, but can freely move 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 the shaft 114, and
A planetary lever 106 by means of a compression spring 104 arranged between 103
Make frictional contact with. This causes the planet lever 106 to move to the gear 103.
It follows and rotates in the direction of rotation. Gear 105 is planetary lever 106
The shaft 115 rotatably supported by the shaft 115 installed in the
Always mesh with. 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 portion of the large gear 107a are rotatably supported by a shaft 111 set up on a ground plate 117,
When the gear 103 rotates clockwise and the gear 105 rotates counterclockwise (arrow direction), 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 erected on the main plate 117, and is a large gear.
It consists of 108a and a small gear (not shown) fixedly formed on the top. The large gear 108a always meshes with the small gear of the gear 107. The gear 110 is rotatably supported by a shaft 116 installed on the planetary lever 106 and constantly meshes with the gear 103. Gear 103
Is rotated counterclockwise and the planetary lever 106 is rotated counterclockwise, the gear 110 meshes with the large gear 108a. The cam gear 109 is rotatably supported by a shaft 124 erected on the main plate 117, and a gear 109a and a cam 113 are formed. Gear 119a
Always meshes with the small gear of the gear 108, and from the pinion gear 101 to the cam gear 1 depending on the rotation direction of the charge motor M1.
The transmission system to 09 is switched. That is, the charge motor
When M1 rotates counterclockwise, each part rotates in the direction of the solid arrow, and the planetary lever 106 rotates clockwise to rotate the pinion gear 101 → gear 102, 103 → gear 105 → gear 107 (large gear).
107a, small gear) → gear 108 (large gear 108a, small gear) → a low speed gear train having a large reduction ratio including a cam gear 109. On the other hand, when the charge motor M1 rotates in the clockwise direction, each part rotates in the direction of the dotted arrow, and the planetary lever 106 rotates in the counterclockwise direction, so that the pinion gear 101 → the gears 102,1.
03, → gear 110 → gear 108 (large gear 108a, small gear) → a high speed gear train having a small reduction ratio including a cam gear 109. The two gear trains are set so that the cam gear 109 always rotates clockwise regardless of which direction the charge motor M1 rotates.

The first shutter charger lever 118 is rotatably supported by a shaft 125 erected on the main plate 117, a rotatable roller 119 is attached to one lever end by a shaft 118a, and the other lever end is Form the cam 118b. The roller 119 slides on the cam surface of the outer periphery of the cam 113 of the cam gear 109 to give a swing to follow the displacement of the cam surface to the first shutter charge lever 118. Then, due to this swing, the cam 118b also swings. The second shutter charge lever 120 is rotatably supported by a shaft 127 erected on the main plate 117 and has a roller 121 having a shaft 120a as a rotation axis. The roller 121 is in contact with the cam 118b, so that the second shutter charge lever 120 can be rocked by the rocking of the first shutter charge lever 118. Then, the second shutter charge lever 120 charges a known shutter mechanism (not shown).

The lever 122 is a lever for charging a known diaphragm adjusting mechanism, a mirror elevating mechanism, a lens driving mechanism, etc.
A shaft 126 is rotatably supported on a shaft 126 set up on the shaft 7, and a rotatable roller 123 is attached to one lever end by a shaft 122a. This roller 123 serves as a cam 118c of the first shutter charger lever 118. To engage. Therefore, the lever 122 also follows and swings by the swing of the first shutter charge lever 118 to charge the aperture adjustment mechanism, the mirror lifting mechanism, and the like. S0 forms a switch with the signal board fixed to the cam gear 109,
A contact member that detects that the cam 113 is rotated by the charge motor M1.

The relationship between the film moving amount and the film moving speed in the film feeding control in which a duty driving section is provided for film feeding (winding) will be described with reference to FIG.

First a, upon full energization of the motor M2 film delivery, the moving speed is constantly rotated reaches a predetermined speed Va in the moving amount X ₁ I rise. After that, the motor M ₂ is duty-driven from the movement amount X ₀ to decelerate, and at the movement amount Xs, the speed becomes Vc, and if the motor drive is stopped at this point, the motor M 2 overruns and stops at the movement amount Xa. .

In FIG. 5 (b), b is different from the above case a when the battery is exhausted and the power supply voltage is lowered, and the steady-state speed Vb and the speed Vd after duty driving are a. Therefore, the overrun amount also differs from a and stops at a film movement amount Xb different from a.

It is necessary to make the overrun amount constant in order to make the feed amount (movement amount) of each frame of the film constant.

The amount of overrun 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 reason, FIG. 5B shows that the vehicle is decelerated to a constant speed Ve in the duty drive deceleration section Xo to Xs.

In FIG. 5B, in the duty drive section Xo to Xs, the film moving speed a is decelerated from Va to Ve, and b is decelerated from Vb to Ve. In this section, a has a greater degree of deceleration than b. In this way, in order to change the degree of deceleration, it is advisable to change the rate of duty energization.
That is, when the steady moving speed is fast and the degree of deceleration is large, the duty energization rate is small, and when the steady state moving speed is slow and the degree of deceleration is small, the duty energization rate is large.

FIG. 6 is a block diagram showing the control of the film feeding motor in the embodiment of the present invention.

When an exposure completion signal such as a shutter rear curtain running completion signal is generated, the control means 1 causes the drive circuit 2 to rotate the film feeding (winding) motor in one direction. As a result, the drive sprocket 4 and the spool 5 start to rotate and the feeding of the film 6 is started. This drive sprocket 4
The film feeding by the spool 5 is performed by the control circuit 1 in the film feeding motor 3 in the initial feeding section.
Is controlled so that it is fully energized. The voltage detection means 8 detects the voltage value of the power supply battery 7 before the film feeding motor 3 is rotated by full energization, that is, immediately before the motor is driven. When the rotation position detecting means 10 for detecting the rotation state of the detection sprocket 9 detects that the film 6 has been fed to the vicinity of the end of one frame (a speed control section for controlling the speed while giving a driving force), the control is performed. The means 1 switches the film feeding motor 3 to duty drive. However, the duty ratio is determined based on the voltage value of the power supply battery 7 detected by the voltage detection means 8. That is, if the voltage value is large, the duty ratio is decreased to increase deceleration, and if the voltage value is small, the duty ratio is increased to prevent deceleration too much, and the film 6 is always fed in this speed control section. Keep the feed rate constant. Then, the film 6 is rotated by the rotational position detecting means 10.
When it is detected that the paper has been fed to the end position of one frame,
The control means 1 applies a braking force to the film feeding motor 3 to stop the feeding of the film 6.

When the rotation speed detecting means detects that the feeding speed of the film has become equal to or less than a predetermined value in the vicinity of the final feeding of one frame of the film 6 (speed control section), the controlling means 1 When the film feeding motor 3 is driven by switching to a duty ratio larger than the current duty ratio, and the film is still not fed, this state is judged as the feeding completion of all the frames of the film, Stop the drive of the film feeding motor.

FIG. 7 shows an electric circuit of a specific example in which the microcomputer COM is used as the control means 1.

When the first stroke switch sw1 is turned on by the first stroke of the release button, the transistor TR1 is turned on and the voltage from the battery Vbt is supplied to each circuit as the power supply voltage V _CC . The arrow ↑ in the figure indicates V _CC , and the arrow ↑
Circuit blocks not marked with, eg operational amplifiers, A /
Of course, the power supply voltage V _CC is also supplied to the D converter and the like. First
Even after the stroke switch sw1 is turned off, the supply of the power supply voltage V _CC is maintained while the low level signal is applied to the base of the transistor TR1 from the output port PE3 of the microcomputer COM through the inverter I1 and the resistor R3. .

The capacitor Cr is connected to the terminal RST of the micro computer COM, the crystal oscillator QZ is connected to the terminals X0 and X1, the power supply voltage V _CC is applied to the terminal V _DD , and the terminal GND is grounded.

To the input ports PA2 to PA3, a front curtain switch swCN1 which is turned off when the front curtain is completed and turned on when the charge is completed, and a rear curtain switch swCN1 which is turned off when the rear curtain is completed and turned on when the charge is completed are respectively connected.

For the input ports PF0 to PF4, the pulse board P1 and the contact piece member S1
(Fig. 1) a first film switch swFLM1, a pulse board P2 and a contact piece member S2 (Fig. 1), a second film switch swFLM2, a pulse board P2 and a contact piece member S3, a third film switch swFLM3, Cam Gear 109 (4th
(Charge switch swCGE, which consists of the signal board and contact piece member S0 fixed to the figure) and turns on when the charge is completed.
The film cartridge 2 is installed in the cartridge storage room 310.
The Patrone storage switch swPTIN, which turns on when 4 is stored and turns off when 4 is not stored, is connected.

The bases of the transistors TR2 to TR4 are connected to the output ports PE0 to PE2, and the transistors TR2 to TR4 are the first tightening magnet MG0 with a permanent magnet for activating the mechanical release operation.
It controls the energization of the front curtain magnet MG1 that drives the front curtain and the power supply of the rear curtain magnet MG2 that drives the rear curtain.

A drive circuit DR2 for driving the film feeding (winding) motor M2 is connected to the output ports PB0 and PB1, and the output port PC
A drive circuit DR3 for driving the rewinding motor M3 is connected to 0 and PC1, and a drive circuit DR1 for driving the charge motor M1 is connected to the output ports PD0 and PD1. The drive circuits DR1 to DR3 have the same circuit configuration, and the circuit configuration is shown in FIG. A 2-bit signal is input to the input terminals A and B. First, assuming that A = 1 and B = 0, the signal at the input terminal B is inverted by the inverter I10.
The output of 12 becomes 1, the output of the OR gate OR10 also becomes 1, and the transistor TR32 turns on. Also, the inverter I1
When the output of 3 becomes 0, the transistor TR31 also turns on. Therefore, the power supply voltage V _CC is applied to the motor M and a current flows, and the motor M rotates in a predetermined direction.

When A = 0 and B = 1, the signal at the input terminal A is the inverter I11.
The output of AND gate A10 is 1,
The output of OR gate OR11 is 1 and the output of inverter I12 is 0.
As a result, the transistors TR30 and TR33 are turned on,
Current flows in the motor M in the opposite direction, and the motor M rotates in the reverse direction.

When A = 1 and B = 1, the outputs of the AND gate A11 are 1, and the outputs of the OR gates OR10 and OR11 are 1, so that the transistors TR32 and TR33 are turned on. Therefore, when this mode is set when the motor M is rotating, the diode D10,
Due to D11 and the transistors TR32 and TR33, no matter which direction the motor M is rotating, the energization is cut off, the terminals are short-circuited, and the inertial rotation of the motor M is braked.

When A = 0 and B = 0, the outputs of the AND gates A10 to A12 are all 0, the transistors TR30 to TR33 are all off, and the motor M is open.

The A / D converter ADC2 is connected to the input ports PH0 to PH3, and the A / D converter ADC2 A / D converts the voltage of the power supply battery Vbt to convert it into a 4-bit digital signal.

The operation of the microcomputer COM will be described with reference to the flow charts of FIGS. 9A, 9B and 10.

[Step 1] Power supply voltage V _CC in response to turning on the first stroke switch sw1
Is supplied by Micro Computer COM
Works. The basic clock is supplied from the crystal oscillator QZ, and at the same time the power on reset is applied by the capacitor Cr. The built-in program counter is initialized to address 0, and the program starts from the start. Further, it is assumed that all flags are 0 and the output port is also 0.

[Step 2] Receive inputs from the input ports P2 to PA3 (hereinafter also referred to as PA input). If the charge of each part is completed and the photographer presses the second stroke of the release button, PA2 = PA3 = 0, so PA input is
The value is 00H in hexadecimal.

[Step 3] If the PA input is 00H, proceed to step 5, otherwise proceed to step 4.

[Step 4] If the PA input is not 00H now, the PE3 output is set to 0. At power-on reset, all the output ports are 0, so this instruction is meaningless, but since the program may jump to step 1 from the middle, it has meaning at this time. (Ratch release of power supply voltage V _CC ) [Step 5] When the PA input is 00H, that is, when the photographer presses the second stroke of the release button, the photographing mode is entered. The PE3 output becomes 1, the transistor TR1 is kept on, and the power supply voltage V _CC is latched.

[Step 6] With PE1 = PE2 = 1, the front curtain magnet MG1 and the rear curtain magnet MG2 are energized.

[Step 7] A / D converter Power supply battery V digitally converted from ADC2
Input the bt voltage.

[Step 8] Since the PH input input in step is in the accumulator A, this value is transferred to the internal register RG1.

[Step 9] PE1 = PE2 = 0 is set and the energization of the front curtain magnet MG1 and the rear curtain magnet MG2 is released.

[Step 10] By setting PD0 = 0 and PD1 = 1, the drive circuit DR1 is operated and the charge motor M1 is rotated. This allows
Charges such as shutters, mirrors, and automatic diaphragms are performed.

[Step 11] Charge motor M1 and film feeding (winding) motor M2
The start time of energization is shifted to create a waiting time for waiting for the current flowing through the charge motor M1 to stabilize. As a result, it is possible to prevent overlapping of overcurrents (rush currents) during initial energization.

[Step 12] Branches to Step 13 when the register RG1 is larger than the constant V1 and to Step 14 when it is small. The constants V1, V2, V3 are V1>
V2> V3.

[Step 13] Set 1 to register RG3.

[Step 14] Branches to step 15 when the register RG1 is larger than the constant V2, and branches to step 16 when the register RG1 is smaller than the constant V2.

[Step 15] Set 2 to register RG3.

[Step 16] If register RG1 is larger than constant V3, branch to step 17, and if it is smaller, branch to step 18.

[Step 17] Set 3 to register RG3.

[Step 18] Set 4 to register RG3.

The purpose of the processing of steps 7, 8, 12-18 is to set the value of register RG3 according to the value of the power supply battery Vbt.
The value of the register RG3 is used to determine the duty ratio of the duty control immediately before the film is stopped, which will be described later in detail. That RG3 = 1 25% Deyutei drive V _1> when VbtV ₂ RG3 = ₂ 50% Deyutei drive V _2> when VbtV ₃ RG3 = ₃ 75% Deyutei drive V ₃ when VbtV1> RG3 = 4 full energization when Vbt As described above, the duty ratio is switched according to the value of the power supply battery Vbt, and a low duty ratio is used when the voltage is high and a high duty ratio is used when the voltage is low.

Here, the duty ratio can be switched in 4 steps.
%, Of course, it is possible to configure in various stages such as 2 stages, 3 stages and multi stages, and it is also possible to configure so that the duty ratio changes linearly in a substantially analog manner. . It is also clear that the duty ratio can be set arbitrarily.

[Step 19] By setting PB0 = 0 and PB1 = 1, the drive circuit DR2 is operated and the film feeding (winding) motor M2 is rotated. This winds the film.

[Step 20] Set flag F0 = F2 = F3 = F4 = F5 = 0, F1 = 1, register
Set a constant M in RG2 and 1 in RG4.

Set a constant K to the timer TMR for timer interrupt. The value of K is a constant determined by the film winding speed, the equal fraction of the pulse substrate P1 (FIG. 1) of the first film switch swFLM1, and the instruction cycle time of the microcomputer COM.

Start timer TMR. Enables timer interrupt (ENT) Timer TMR has started, and timer TMR is independent of the main program routine thereafter.
Repeats decrement for a certain period of time (depends on constant K)
Each time an interrupt occurs, the program being executed is jumped to a dedicated timer interrupt address. Here, the timer interrupt process will be described with reference to FIG.

"Timer interrupt process" [Step 101] Disable the timer TMR decrement operation and interrupt.

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

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

Since F4 = 0 was set in step 80, the process branches to step 103.

[Step 103] Read the value of swFLM1 from the 1st film switch.

[Step 104] If PF0 = 1, proceed to 113. If PF0 = 0, proceed to 105.

[Step 105] The flag F2 is determined, and F2 = 0 is set in Step 20, and then Step 106 is entered.

[Step 106] The content of the internal register RG2 is decremented by 1.

[Step 107] It is determined whether RG2 = 0. RG2 = M for programs up to now
Since it is -1, it does not become 0 if M is a large value, so the routine proceeds to step 108.

[Step 108] Receive the PF1 input from the second film switch swFLM2.

[Step 109] Determine if RF1 = 0.

RF if the film is not sent until just before one frame is wound
Since it is 1-1, proceed to step 110.

[Step 110] Reset the constant K to the timer register and reset the timer TMR.
To enable interrupts and return to the original execution program.

The timer interrupt process is performed by the program being executed, and three film switches swFLM1, swFLM2, sw are set at regular intervals.
The purpose is to make it difficult to determine the FLM3 status. Since the program itself executes each instruction at a very high speed, the film winding information is input at regular intervals so that there is practically no problem.

If the first film switch is turned off in the existing timer interrupt process, the process proceeds from step 104 to step 113.

[Step 113] The flag F2 is determined.

Go to 114 with F2 = 0 set in step 20.

[Step 114] Set the flag F2 to 1. This means that the eleventh film switch swFLM1 is off, that is, PF0 = 1.

[Step 112] The constant M is set again in the internal register RG2.

Thereafter, the process proceeds to step 108 and the above-mentioned routine is executed.

At the next timer interrupt, PF0 = 1 in step 104
Since F2 = 1 at step 113, the process proceeds to step 106 and the value of the internal register is decremented by 1. After that, the timer interrupt is repeated by the above-mentioned routine.

If the first film switch is turned on in the existing interrupt process, the process proceeds to step 105 at step 104.

In step 105, F2 is discriminated. In step 114, since F2 = 1 is set, the process proceeds to step 111.

[Step 111] Set the value of F2 to 0. After that, the value of the register RG2 is reset and the above routine is proceeded to.

The operations of steps 104 to 107 and 111 to 114 can be summarized as follows. When the value of the first film switch swFLM1 is different from that of the previous interrupt processing, the value of the flag F2 is reset to the setting register RG2 and the constant M is reset. Decrements the value of register RG2. When the film is smoothly wound up, sprocket 29
Since a also rotates and the first film switch swFLM1 switches at almost constant intervals, the value of the register RG2 does not become zero.

However, if the film becomes taut at the end of the film, for example, when a film of 24 shots is used and 24 frames have been taken, the film feeding (winding) motor M2 tries to wind the film, but the film moves any further. The first film switch swFL
On / off of M1 does not change. Therefore, the flag F2
Is fixed at 1 or 0 and does not change.
Decrement the contents of the internal register RG2 by 1 and the first film switch swFLM1 does not change and M
The value of register RG2 becomes 0 in the second timer interrupt processing.

Therefore, step 107 proceeds to step 136.

[Step 136] PB = 0 and PB1 = 0 are set, and the power to the film feeding (winding) motor M2 is turned off.

[Step 137] Set the flag F0 = 1. This indicates that the film is finished. After that, the process returns to the original main routine, but since the timer interrupt is still prohibited at 101, the timer interrupt is not applied.

It is assumed that the film is normally placed and it is just before the winding of one frame. At this time, since the second film switch swFLM2 is turned on, step 109 branches to step 115.

[Step 115] The flag F4 = 1, the register RG2 is set to a constant M1, and the process proceeds to step 110, where the timer interrupt is set.

In the next interrupt processing, since the flag F4 = 1, the process proceeds to step 116.

[Step 116] Compare the values of the register RG3 and the register RG4. If the register RG3 is smaller than or equal to the register RG4, proceed to step 118, and proceed to step 117 when it is greater.

[Step 117] PB0 = 1 and PB1 = 1 are set and the film feeding (winding) motor M2 is braked.

[Step 118] PB0 = 0 and PB1 = 1 are set and the film feeding (winding) motor M2 is energized.

[Step 119] Add 1 to the register RG4.

[Step 120] When register RG4 = 5, the operation proceeds to step 121.

[Step 121] Set 1 to register RG4.

Therefore, register RG is set for each timer interrupt process.
4 repeats the cycle of 1 → 2 → 3 → 4 → 1 → 2 → …….

If register RG3 is 1, step 118 if RG4 = 1
When the motor energization register RG4 is 2, 3 or 4, step 119
Then the motor brake will be applied.

The motor M2 for film feeding (winding) is step 11
Even if the brake is applied at 7, it cannot continue immediately due to inertia and continues to rotate.

The film feeding (winding) motor M2 is decelerated by performing the repetitive control of energization → brake → brake → brake → energization → …… for each timer interrupt.
At this time, the power supply to the motor M2 is 25
Since it occupies% time, it will be driven with a duty ratio of 25%.

This is shown in FIG. 11A (a).

The state of each film switch swFLM1,2,3 is shown on the uppermost side. In (a), when the switch swFLM2 is turned on, the waveform of PB0 repeats high and low. When low, the motor M2 for film feeding (winding) is energized, and when high, the motor brake is applied.

Similarly, when register RG3 = 2, it is driven at a 50% duty ratio [(b) of FIG. 11 (A)] When register RG3 = 3, 7
The duty drive is performed at 5% [(c) in FIG. 11 (A)]. When the register RG3 = 4, all the steps branch to the step 118 in step 116, so that full energization occurs [(d in FIG. 11 (A)]. )].

In this way, the duty ratio can be switched according to the value of the register RG3 set according to the value of the power source battery Vbt in steps 7 to 18.

Steps 122 to 130 detect the change of the second film switch swFLM2 just like steps 104 to 108 and 111 to 114, and when it changes, reset the constant M1 in the register RG2, and when it does not change the value of the register RG2 to 1 Even if the timer interrupt process is performed M1 times,
If the film switch swFLM2 has not changed Step
This routine branches to 138. If the film is smoothly wound up, the process proceeds to step 131.

[Step 131] Input the 3rd film switch swFLM3 from PE2.

[Step 132] When the third film switch swFLM3 is off, that is, PF2
When = 1, the process proceeds to step 110, resets the timer interrupt, and returns to the main routine. In this way, the processes of steps 116 to 132 are performed for each timer interrupt process, and the film is wound by duty drive.

When the film is wound up one frame now, the third film switch swFLM3 is turned on, and the process proceeds to step 134.

[Step 134] The 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 the completion of winding.

Similar to step 137, since the timer interrupt is not set again, the timer interrupt is not applied again thereafter.

Next, the case where the film is not wound up during duty driving will be described.

When the second film switch swFLM1 does not change and the timer interrupt is performed M1 times, the register RG2 is decremented to 0, and the process branches to step 138 at step 130.

[Step 138] If the flag F5 is determined to be F5 = 1, the flow branches to step 143. Since F5 = 0 has been set in step 20, the process proceeds to step 139.

[Step 139] If the value of the register RG3 is 4, that is, full power is supplied even in the duty section, the process proceeds to step 143.

When the register RG3 is 1,2,3, the process proceeds to step 140.

[Step 140] Add 1 to the value of register RG3. That is, the one-step duty ratio is increased.

[Step 141] Set 1 to the flag F5.

Reset the constant M1 in the register RG2, set the timer interrupt again, and return to the main routine.

Therefore, if the film does not move during the duty driving and a certain time has elapsed, the duty ratio is switched to a higher duty ratio and the duty driving is performed. If the film is rolled up with a large duty ratio,
The film switch swFLM3 is turned on, and the process goes to step 134 to finish the winding.

The state at this time is shown in FIG. 11 (B). If the film is not wound even with a large duty ratio here, the value of the register RG2 becomes 0 again in step 129.
Then, at step 130, it branches to step 138.

Since the flag F5 has been set to 1 at step 141 this time, the process branches to step 143.

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

[Step 144] 1 is set to the film end flag F0. After that, the process returns to the main routine.

Therefore, when the film does not move during duty driving, the film is driven again with a duty ratio larger by one step, and if the film is still not wound up, it is judged that the film is finished. Do exactly.

Return to the description of the main program routine.

[Step 21] Input the signal from the charge switch swCGE, which indicates that the charge of the shutter, mirror, automatic diaphragm, etc. has been completed.

[Step 22] Together with Step 21, a routine for waiting until the charge is completed is constructed. Of course, the timer interrupt process is repeatedly performed during this period.

[Step 23] Set PD0 output to 1. This brakes the charge motor M1.

[Step 24] The flag F0 indicating the end of the film is determined. If the film is not finished now, go to step 25.

[Step 25] Same as Step 2.

[Step 27] Steps 24 to 27 are repeated until the winding completion is confirmed by the timer interrupt process, that is, until F1 = 0. When the winding is completed, the process returns to START (step 1), and at step 4, the latch of the power supply voltage V _CC is released. When the first stroke switch sw1 is also off, the power supply voltage V _CC
Disappears. (Filming sequence end) "Rewinding process" When the film is finished while being wound up, the flag F0 is set to 1 in the timer interrupt process, and therefore the process branches from step 24 to step 28.

[Step 28] Set the PE2 output to 1 and energize the rear curtain magnet MG2 to drive the rear curtain.

[Step 29] A certain amount of time is used by the timer to set the time required for the trailing curtain to finish running.

[Step 30] With PE2 = 0, turn off the power to the rear curtain magnet MG2. This is to prevent the film from being fogged by the photographer inadvertently removing the lens during the rewinding and irradiating the shutter curtain with a strong light beam. Since both the first and second curtains are present on the aperture, it is possible to completely prevent the light on the film surface.

[Step 31] Input the signal from the trailing curtain switch swCN2.

[Step 32] Wait for the completion of the trailing curtain running, and when the running is completed, proceed to Step 33.

[Step 33] Set PC0 = 0 and PC1 = 1 and rotate the rewinding motor M3.

[Step 34] Set internal register RG2 to M1.

[Steps 35-43] Steps 102, 103, 10 in timer interrupt processing
The program is similar to the program for detecting the movement of the film described in 5,106,107,115,116,117,120. It is a program for detecting that the drive sprocket 29a does not rotate when the rewinding is completed. When the rewinding is completed, the program proceeds to step 44. .

[Step 44] Set PC0 = 1 and stop the rewinding motor M3.

[Step 45] The flag F0 indicating the end of the film is reset to 0.

[Step 46] PD0 = 0 and PD1 = 1 are set, and the charge motor M1 is rotated. This is for returning the shutter mechanism to the charge completed state because the trailing curtain is traveling at step 28 before rewinding.

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

[Step 48] Wait for the completion of the charge and proceed to step 49.

[Step 49] Stop the rotation of the charge motor M1. This completes the rewinding process and returns to START (step 1).

Next, the present invention and other embodiments will be described with reference to FIG.

The other embodiment is that the speed control in the speed control section of the feeding motor M2 is not the duty control but is the voltage level (current level) control, and other than that is the same as the above embodiment. Is.

That is, FIG. 12 (A) (a) shows the state of the voltage level 25% corresponding to the duty ratio 25% drive in the above-mentioned embodiment, and hereinafter, similarly, in (b), the voltage level 50%. %,
The voltage level is 75% in (c), and the voltage level is 100 in (d).
% Status is shown.

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.

In FIG. 11 (B), the feeding motor M2 was driven at a voltage level of 25% during the speed control section, but when the film stopped for a certain time, the voltage level was increased to 50%. The switched state is shown.
When the film does not move even with the driving force having the large voltage level, this state is judged to be the completion of feeding all the frames of the film, and the power supply to the film feeding motor M2 is turned off.

[Modifications other than the embodiment]

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

Although the value of the power source battery Vbt is detected before the feeding motor M2 is driven in the above-described embodiment, this detection time may be detected when the feeding motor M2 is initially energized.

〔The invention's effect〕

As described above, according to the present invention, the film feeding speed immediately before the brake is applied can be controlled without the need for forming a mechanical winding stop member, so that the film feeding amount for each frame is constant. It is also possible to prevent unnecessary power consumption. Further, according to the present invention, it is possible to provide a film feeding device capable of properly feeding the film even if the power supply voltage is lowered or the film load is increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing a hoisting transmission system of a camera as an embodiment of the present invention. FIG. 2 is a perspective view showing a rewinding transmission system of the same camera. FIG. 3 is a perspective view showing the shutter of the camera. FIG. 4 is a perspective view showing a charge transmission system of the camera. FIGS. 5A and 5B are graphs showing the relationship between the film moving speed and the film moving amount. FIG. 6 is a block diagram showing the operation of the camera. FIG. 7 is a circuit diagram showing a microcomputer and peripheral circuits. FIG. 8 is a circuit diagram showing a drive circuit. Figures 9A, 9B and 10 are flow charts. Figures 11 (A) and (B) are time charts. 12 (A) and 12 (B) are time charts showing another embodiment of the present invention. 1 ... Control means, 3 ・ M2 …… Film feeding (winding) motor, 4 ・ 29a …… Drive sprocket, 5 ・ 22 …… Spool, 9 ・ 29b …… Detection sprocket, 6 ・ F …… Film , 7 ・ Vbt …… Power supply battery, 8ADC2 …… Voltage detection means, 10 ……
Rotation position detection means, 11 ... Rotation speed detection means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-88733 (JP, A) JP-A-60-123828 (JP, A) JP-A-49-84436 (JP, A)

Claims (3)

[Claims] 1. A film is fed using a motor as a drive source, and a speed control section for controlling the speed while applying a driving force to the motor and a braking section after that are provided for each frame feeding of the film. In the film feeding device, the voltage check means for obtaining voltage information of the power source for driving the motor, and the effective voltage applied to the motor in the speed control section based on the voltage information obtained by the voltage check means are controlled. First control means, a detection means for detecting the film feeding speed in the speed control section, and the first control when the film feeding speed less than a predetermined value is detected by the detection means. Second control means for applying to the motor an effective voltage greater than the effective voltage controlled by the means, and also in the supply of the effective voltage by the second control means, the detection means has a film having a predetermined value or less. The third film feed device comprising a control unit, that was provided for when detecting transmission speed to stop controlling the motor. 2. The duty control of the motor according to claim 1, wherein the speed control section drives the motor in duty, and the effective voltage is controlled by the first and second control means. Film feeding device that changes the ratio. 3. A film feeding apparatus according to claim 1, wherein the film is fed in the reverse direction after the motor is stopped and controlled by the third control means.