JPH04119435U - electromagnetic drive shutter - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to reduce the number of components that control the shutter opening speed, thereby achieving cost reduction and miniaturization. [Structure] The present invention provides a stepper motor equipped with a load means 31 that is movable relative to the rotor 1 in the rotation axis direction of the rotor 1 as the rotor 1 magnetized in the radial direction of the step motor rotates. It has a motor and is configured to open and close sectors 16 and 17 by rotating the rotor 1. [Effects] According to the present invention, the number of parts can be reduced compared to the conventional electromagnetic drive shutter, thereby reducing costs, and since the load means 31 can be replaced with a relatively small load means, the shutter can be made smaller and lighter.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an electromagnetic device that opens and closes the shutter opening by rotating the rotor of a step motor. Regarding a driving shutter.

0002

[Conventional technology]

As a conventional electromagnetic drive shutter, for example, the application filed by the present applicant (Utility Application No. There is one shown in FIG. 7, which is described in the specification and drawings of No. 67123). This conventional An example is to measure the speed of sector 17 before exposure to optimize exposure control. . In other words, the opening speed of the sector 17 is adjusted to the maximum of the photocoupler 19 by the edge 17b. The opening is detected by the first light blocking time and the signal that is blocked by the square hole 17c again. This starts a timer that controls the time from the trigger to the closing.

0003

[Problem that the idea aims to solve]

However, in this conventional electromagnetic drive shutter, when the coil 6 is energized in the positive direction, The magnetic poles of the stator 5 are excited, which causes the magnetic poles of the rotor 1 to repel and rotate to the right.

0004 Then, the rotor pinion 3 rotates to the right and opens and closes through the meshing of the gear parts 3a and 7d. Sectors 16 and 17 are opened by turning lever 7 to the left. . If the rotation of the rotor 1 and rotor pinion 3 at this time is too fast, the curve A in FIG. , the predetermined shutter opening amount D passes in a very short time t1, and the control circuit There is a delay in the operation of the rotor 1 and each mechanical element that should respond to the control signal of the road, and the amount of exposure Errors are likely to occur. As shown in curve B in the same figure, when the time is slower and relatively longer, If the shutter opening amount D is opened during the interval t2, there is no delay in response to the control signal. Reliable control can be performed. Therefore, it is necessary to open at an appropriate speed as shown in curve B in the same figure. In order to The connecting intermediate lever 10 is engaged. For this reason, the flywheel 12 and Interval lever 10, etc. are required, which increases cost, size, and weight due to increased number of parts. There was the problem of inviting. Therefore, the purpose of this invention is to solve the above problems. are doing.

[0005]

[Means to solve the problem]

In order to solve the above problems, the present invention is designed to be able to rotate freely around the support shaft and in the radial direction. A stator having a magnetized rotor and a plurality of magnetic poles facing the outer periphery of the rotor. a coil that excites the stator; and a coil that excites the stator; A step motor is provided with a load means that is movable relative to the rotor in the direction of the moving axis. It has a structure in which the sectors are opened and closed by the rotation of the rotor. be.

[0006] According to the electromagnetically driven shutter with such a configuration, the electromagnetically driven shutter described above is superior to the conventional electromagnetically driven shutter. Comparatively, it does not require parts such as large flywheel 12 or intermediate lever 10. Since it can be replaced with a relatively small load means, it is possible to reduce cost, size, and weight. I can do it.

[0007]

【Example】

Hereinafter, one embodiment of an electromagnetically driven shutter according to the present invention will be described in detail with reference to the drawings. figure The electromagnetically driven shutter according to No. 1 operates sectors 16 and 17 as shown in the figure. A photocoupler equipped with a motor MT, a light-emitting diode D1, and a light-receiving transistor Q8. The plug 19, startup circuit 20, PI signal sending circuit 21, and data access circuit 22 are included. PI signal generation circuit DG, timer numerical calculation circuit 28, timer TIM, motor Motor drive circuit DV having transistors Q1 to Q6 that drive motor coil MC , and a CPU 30 equipped with a ROM 30a, the CPU 30 is a motor control program. Built-in program and timer program.

[0008] As shown in Fig. 2, the rotor 1 of the motor MT has two permanent magnetic poles magnetized in the radial direction. The rotor shaft 2 is press-fitted into the center of the stone. Rota kana 3 has an opening/closing lever. A gear part 3a that engages with the gear part 7d of the -7 and an arm part 3b that comes into contact with the stopper 4 are provided. When the motor coil 6 is not energized, the arm portion 3b moves the rotor 1 at an angle of about θ with respect to the static position. It is configured to stop at an angle of 58°. This angle is relative to the magnetization angle of rotor 1. It is determined by the press-fitting angle of the arm portion 3b of the rotor pinion 3.

[0009] A stator 5 and a motor coil 6 are arranged outside the rotor 1, and a motor coil 6 is arranged on the outside of the rotor 1. Ile 6 can be energized in both the forward and reverse directions, and when energized in the forward direction, sector 1 6 and 17 are open, and when electricity is applied in the opposite direction, sectors 16 and 17 are closed. That is, When the motor coil 6 is energized in the positive direction, the magnetic pole of the rotor 1 is opposite to the magnetic pole of the stator 5. It is excited so that it becomes the same as . For this reason, the rotor 1 repulses and rotates, and when reversely energized The opposite is true.

0010 The opening/closing lever 7 has a pin 7a that drives the sectors 16 and 17 and a point of action of the spring 9. The rotor pinion 3 is made up of a protrusion 7b and a gear portion 7d that meshes with the rotor pinion 3. Ba The lever 9 biases the opening/closing lever 7 in the closing direction (clockwise rotation direction), and when the motor coil 6 is not energized, However, this spring 9 biases the sectors 16 and 17 from the open position to the closed position. ing.

[0011] As shown in FIGS. 3 and 4, the rotor shaft 2 is configured to be slidable in the axial direction, and The initial position is the position where the heights of the stator 1 and the stator 5 are approximately the same (Fig. 3), and the rotor 1 and the cam slope of the cam member 31 (load means) in contact with the protrusion 1a At the same time the rotor 1 is rotated by the cam means constituted by Since the rotor 1 is pushed down against the magnetic field (Fig. 4), this movement becomes a load, Sector opening operations can be delayed. For this reason, a moderate The opening speed can be set as desired. In the sector closing operation, the rotor 1 is rotated by the magnetic field. Since it moves in the direction approaching the theta 5, it moves faster than when opening.

0012 In FIG. 2, the sector 16 is pivoted at the same center as the rotation center 8 of the opening/closing lever 7. Then, the pin 7a fits into the long groove 16a and rotates. Sector 17 is in front case 18 It is pivotally supported, and the pin 7a is fitted into the long groove 17a together with the sector 16 to rotate. sexy The sensor 17 is provided with an edge 17b forming a first edge and a square hole 17c as a detection part. The front edge of the square hole 17c becomes the second edge, and the rear edge becomes the third edge of the photocoupler. By blocking and transmitting the light beam 19a of 19, the first and second photointerrupters A signal is generated. This first photointerrupter signal has a starting speed coefficient TS. Contains meaning.

[0013] The photocoupler 19 has the outer periphery of the sector 17 inserted between the emitter and receiver parts. The photointerrupter signal output from the photocoupler 19 is In the initial state, light is passing through, so it becomes L level, sector 17 is driven and light is transmitted. When the bundle 19a is cut off, it becomes H level. Also, when the light beam passes through the square hole 17c, It becomes L level again, and then becomes H level at the edge of the square hole 17c. The photoi The interrupter signal is output to the CPU 30 as a PI signal via the sending circuit 21. .

[0014] As shown in FIG. 5, the PI signal generation circuit DG and motor drive circuit DV shown in FIG. Pins P1, P2, P3 and P4, P5 of the CPU 30 are the pins of the PI signal generation circuit DG. Connected to P7, P8, P9 and pins P10, P11 of motor drive circuit DV, respectively. Ru. The starting circuit 20 of the PI signal generation circuit DG is composed of a transistor Q7 and a resistor R4. The base of transistor Q7 is connected to pin P7 through resistor R4, and the emitter is connected to pin P7 through resistor R4. When connected to the reference potential point and activated by the CPU 30, transistor Q7 turns on. The photocoupler 19, the PI signal sending circuit 21, and the data access circuit 22 are The reference potential point is switched via the controller. Photocoupler 19, light emitting diode The cathode of the code D1 and the emitter of the photodetector transistor Q8 are both connected to the transistor Q. 7 and the anode of the light emitting diode D1 and the light receiving transistor Q. 8 is connected to the power supply +Vcc via resistors R10 and R11.

[0015] The base of the transistor Q9 of the PI signal sending circuit 21 is connected to the light receiving point via the resistor R6. The collector and emitter of transistor Q8 are the collector and emitter of transistor Q7. The collectors are each connected to pin P8, and the PI signal is sent from the collector to pin P8. It will be done. This PI signal converts the signal sent earlier into the first photointerrupter signal, and then The signal sent from The interrupter signal is connected to the starting speed coefficient TS (or pulse TS), the second photoinput The interrupter signal is defined as the shutter starting pulse TC. Data access circuit 22 The base of transistor Q10 is connected to the collector of light receiving transistor Q8 via resistor R9. The collector is connected to pin P9.

[0016] In FIG. 1, the timer value calculation circuit 28 is connected to the pin P8 of the PI signal generation circuit DG. When the PI signal is input from the starting speed pulse TS, the starting speed pulse is The exposure amount Ev is calculated from the TS, and the calculated value is set in the timer TIM. Pi When the PI signal input from pin P8 is the shutter starting pulse TC, the timer TI M counts down the set value, and when the timer TIM value reaches 0 At this point, the CPU 30 pin P2 is notified that the shutter opening time has ended.

[0017] In FIG. 5, transistors Q2 and Q5 of the motor drive circuit DV each The base of is connected to pins P11 and P10, and normally both M1 and M2 signals are at L level, and M When the 1 signal is at H level and the M2 signal is at L level, transistors Q5, Q3, and Q4 is turned on, the motor coil 6 is energized in the direction of the solid arrow, and the sectors 16, 1 7 is opened. When the M2 signal goes to H level, transistors Q2, Q1, and Q6 turn on. It turns on and sectors 16 and 17 are closed.

[0018] In addition, 23 shown in FIG. 1 is a film sensitivity detection section, 24 is a photometry section, 25 is a distance measurement section, 26 is the mode select section, 27 is the lens barrel, 27a is the lens, and SW1 is the release button. be.

[0019] In the electromagnetic drive shutter with the above configuration, when the release button SW1 is pressed, the sector The light emitting diode D1 of the photocoupler 19 and the light receiving transistor are connected at the edge 17b of the -17. Since it is inserted between the star Q8, the light beam 19a is blocked and the pin of the CPU 30 is A PI signal is sent from the PI signal sending circuit 21 to pin P2. This PI signal The optical axis of the to coupler 19 extends from the edge 17b of the sector 17 to the front edge of the hole 17c. It corresponds to the distance TS, the elapsed time has the meaning of the starting speed coefficient TS of the same name, and the sector It predicts the speed of sector 17, and the speed of sector 17 is predicted by the influence of voltage, temperature, etc. The faster the time, the shorter the time; the slower the time, the longer the time.

[0020] When the aforementioned release button SW1 is pressed, the shutter opening operation starts from the point shown in Figure 6. At the beginning, the timer numerical calculation circuit 28 calculates the timer TIM point from the starting speed coefficient TS. , and set a numerical value corresponding to the exposure amount Ev in the timer TIM. next , a shutter starting pulse TC is sent from pin P8 of the PI signal generation circuit PI. At this point, the timer TIM starts counting down the set value. Thailand When the value of MARTIM becomes 0, the shutter is closed.

[0021] Note that the starting circuit 20, P included in the PI signal generating circuit DG in the above embodiment Data processing between the I signal sending circuit 21, data access circuit 22, and CPU 30 You may also serialize the process and integrate pins P1, P2, P3, P7, P9, and P8. . Moreover, the phase of blocking and passing through the edge 17b provided as a detection part and the square hole 17c are opposite. It may be formed as follows. Also, the rotor 1 does not move in the axial direction and the cam member 31 It may also be arranged so that one side moves in the axial direction against a spring or the like and acts as a load. Furthermore, the luminous flux Instead of blocking and passing through 19a, a reflection pattern formed on the sector surface is used. The detection unit may be configured with reflection/non-reflection or reflection/transmission.

[0022]

[Effect of the idea]

As explained above, according to the present invention, the large Since parts such as the flywheel 12 and intermediate lever 10 are not required, the number of parts can be reduced. In addition to reducing costs, it is possible to replace them with relatively small load means. Therefore, it is possible to reduce the size and weight.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an electromagnetically driven shutter according to the present invention.

FIG. 2 is a configuration diagram of a sector and a rotor related to the electromagnetically driven shutter of FIG. 1;

FIG. 3 is a side view of the sector and rotor of FIG. 2;

FIG. 4 is a side view showing the operation of the rotor in FIG. 3;

5 is a circuit diagram related to the electromagnetically driven shutter of FIG. 1. FIG.

FIG. 6 is an operation diagram showing the sequence of opening and closing the shutter.

FIG. 7 is a configuration diagram showing a conventional electromagnetically driven shutter.

FIG. 8 is a characteristic diagram showing operating characteristics of shutter opening and closing.

[Explanation of symbols]

1 rotor 1a protrusion 2 Rotor shaft (support shaft) 5 Stator 6 Motor coil 16,17 sector 31 Cam member (loading means) MT step motor

Claims (1)

[Scope of utility model registration request] 1. A rotor rotatable around a support shaft and magnetized in the radial direction, a stator having a plurality of magnetic poles facing the outer periphery of the rotor, a coil that excites the stator, and the rotor. and a step motor that is movable relative to the rotor in the rotational axis direction of the rotor as the rotor rotates.
An electromagnetically driven shutter characterized by opening and closing sectors.