JP3208536B2 - Motor control shutter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control shutter device for controlling the opening / closing operation of a sector by a control motor.

[0002]

2. Description of the Related Art Conventionally, as such a motor control shutter device, for example, Japanese Patent Application No. Hei 2-2876 filed by the present applicant has been proposed.
No. 5 (Japanese Utility Model Laid-Open No. 3-119833).

The conventional motor control shutter device will be described with reference to the drawings. In FIG. 7, the sector drive member 201 has a shutter opening 20
Along with two sectors 202 (one of which is not shown) arranged symmetrically with respect to 6, it is supported rotatably about a shaft 210. The sector drive member 201 rotates integrally with the shaft 210, and the shaft 210 is rotationally driven by a step motor M that can rotate forward and reverse. The arm 201a of the sector drive member 201 engages with the engagement pin 203a and is related to the small aperture plate drive member 203. The sector pin 201b of the sector drive member 201 engages with the groove 202a of the sector 202 and
The sector 202 is driven. The sector drive member 201 is normally urged in a counterclockwise direction by a spring (not shown).

The small-diaphragm plate driving member 203 includes a small-diaphragm plate 204.
The movable iron piece pin 203b of the small diaphragm driving member 203 is engaged with the movable iron piece 205a so as to be rotatable about a shaft 211 supported by the main plate. The small stop plate 204 has a stop opening 204 a having a smaller diameter than the shutter opening 206.
4c is normally urged clockwise. The movable iron piece 205a is attracted to or released from the iron core 205b of the electromagnet 205 by turning on and off the electromagnet 205,
When the movable iron piece 205a is opened without being attracted to the iron core 205b, the small aperture plate 204 can be moved to the first position A where the aperture opening 204a comes into the shutter opening 206,
When the movable iron piece 205a is attracted to the iron core 205b, the small aperture plate 204 is retracted from the inside of the shutter opening 206.
At a position B.

The operation of the motor control shutter device having such a configuration will be described. When the step motor M operates, the sector drive member 201 starts rotating clockwise against a spring (not shown), and the sector 202 also starts rotating via the sector pin 201b. As described above, the electromagnet 205 is turned off and the movable iron piece 205a can move freely, and the small aperture plate 204 is
Urged in the clockwise direction by the
03a follows the arm 201a so that the small aperture driving member 2
03 and the small aperture plate 204 start rotating. During the opening preparatory operation for rotating the two sectors 202 in the opposite directions to each other to rotate to the pinhole position where the exposure port starts to be formed, the sector driving member 201 and the small aperture plate driving member 20 are rotated.
Since the small aperture plate control means such as 3 controls whether the small aperture plate 204 can move from the second position B to the first position A, the movement of the small aperture plate 204 can be automatically controlled. In addition, the operability of the camera has been improved to prevent malfunction.

[0006]

However, in such a conventional motor control shutter device, since the small aperture plate is moved to the first or second position during the preliminary opening operation of the sector, Since a load for operating the sector and the small aperture plate is simultaneously applied to the motor, a larger motor output is required than when the motor is operated alone. or,
It is necessary to complete the setting of the small aperture plate while the sector moves from the initial position to the position forming the pinhole,
The movement amount of the sector to the position where the pinhole is formed is restricted by the setting stroke of the small aperture plate, and it is difficult to reduce the movement amount. In addition, since the small aperture plate is set immediately before the pinhole, mechanical bouncing at the time of setting adversely affects the exposure.

[0007]

According to the motor control shutter device of the present invention, when an object is bright, a small aperture plate having an aperture smaller in diameter than a shutter opening formed in advance and a rotor operating member are used as the first member. By operating in the second operation region, it can be controlled to occupy a position (first position) within the shutter opening. In this case, since the operation timing of the small aperture plate and the sector can be completely separated, the degree of freedom in the operation sequence increases.

When the shutter opening is used as an aperture when the subject is relatively dark, the rotor operating member must
Only the operation in the first operation region is performed, and there is no need to operate the small aperture plate, so that the load applied to the motor is small as in the above case. Thus, working territory to operate the sector
By operating the rotor operating member in an operating region different from the region, the movement of the small aperture plate to the first or second position can be controlled, so that the small diaphragm plate is not affected by mechanical bouncing during setting. In addition, the load applied to the motor can be reduced. As a result, the motor can be reduced in size, so that the camera can be made more compact and erroneous operation can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS For this reason, the motor control shutter device of the present invention has a motor which is controlled by a control circuit to rotate forward and backward, a sector which opens and closes a shutter opening, and an aperture opening which is smaller in diameter than the shutter opening. A small aperture plate moving between a first position where the aperture opening comes into the shutter opening and a second position retracting from the shutter opening, and a motor.
A rotor actuating member which is actuated operating the sector or sub-aperture plate, the rotor actuating member in the first operating region by rotating the <br/> sector, a second actuating different from the first operating region
In the area, the sector and the small aperture plate are selectively operated according to the operation area so that the small aperture plate is moved.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the stator 9 and the rotor 1
0 and the coil L constitute a swing motor M, and the stator 9 is provided with pole portions 9a and 9b, and when the coil L is energized, an N pole and an S pole are generated respectively. This allows the rotor 10 to rotate in both forward and reverse directions.

The sectors 23 and 24 driven by the rotation of the swing motor M to open and close the shutter opening 2 are arranged symmetrically with respect to the shutter opening 2 as shown in FIG. 2, and the sector 24 is not shown. It is supported rotatably around a shaft 25 protruding from the main plate. The sector 23 is rotatably supported around a shaft 22 protruding from the main plate, and a sector opening / closing lever 20 is supported on the upper surface of the sector 23 so as to be rotatable around the shaft 22. The arm portion 20b of the sector opening / closing lever 20 is provided with an engaging pin 21 provided on the main plate.
And the sector opening / closing lever pin 20a of the sector opening / closing lever 20 is axially attached to the sector 23, and
And drive the sectors 23 and 24 by engaging with the groove 24a. The sector opening / closing lever 20 is normally urged clockwise by a spring 20d.

A rotor operating lever 11 is press-fitted and fixed to the rotor 10 shown in FIG. 1, and the rotor operating lever 11 rotates integrally with the rotor 10. The rotor operation lever pin 11a provided on the rotor operation lever 11 includes:
It is engaged with a throttle operating member 12 supported rotatably around a shaft 13 protruding from the main plate. The aperture operating member 12 is
It is rotatably contacted with a small aperture plate 3 described later, and is normally urged in a counterclockwise direction by a spring 12a.
Note that the rotor operation lever 11 rotates clockwise ,
When reaching the first operation area, the engagement pin 14 is provided on the main plate so that the aperture operation member 12 does not rotate counterclockwise. Further, the rotor operation lever pin 11b provided on the rotor operation lever 11 shown in FIG. 2 can contact the sector opening / closing lever 20, and the rotor operation lever 11 rotates clockwise to reach the first operation area. Thus, the sector opening / closing lever 20 can be rotated counterclockwise to operate the sectors 23 and 24.

The small aperture plate 3 shown in FIG. 1 has an aperture opening 3a smaller in diameter than the shutter opening 2 so that an accurate aperture can be obtained quickly and photographed. The movable iron pin 3 b rotatably supported and provided on the small aperture plate 3 is engaged with the movable iron piece 19. The small aperture plate 3 is normally urged clockwise by the spring 3c, but contacts the positioning pin 5 protruding from the main plate to maintain its position. The movable iron piece 19 is attracted to or released from the iron core 18 of the electromagnet 17 by turning on and off the electromagnet 17. When the movable iron piece 19 is opened without being attracted to the iron core 18, the aperture opening 3 a is closed by the shutter opening 2. When the movable iron piece 19 is attracted to the iron core 18, the small aperture plate 3 is moved to the first position A inside the small aperture plate 3.
It is held at the second position B retracted from the inside.

Next, the operation of the motor control shutter device will be described. FIGS. 1 and 2 show a state before the shutter is operated. In this state, the electromagnet 17 is turned off, but the rotation of the small aperture plate 3 by the biasing action in the clockwise direction by the spring 3 c is restricted by the positioning pin 5. The second position B is maintained. Here, as in the case where the subject is bright, the first program (shown by a broken line in FIG. 4) is selected by the program selecting means 1 shown in FIG. Will be described.

First, the release button 6 of the camera shown in FIG.
Is pressed, the control circuit 7 energizes the coil L shown in FIG. When the coil L is energized, the pole 9a of the stator 9 first has an S pole and a pole 9b.
, An N pole is generated, and the rotor 10 rotates counterclockwise. By this rotation, the rotor operation lever 11 press-fitted and fixed to the rotor 10 also rotates counterclockwise , and the second operation
Reached a region Runode, and small stop plate 3 rotates in the counterclockwise direction via the rotor actuating lever pin 11a engaged with that stop operating member 12 of the rotor actuating lever 11, shown by a two-dot chain line in FIG. 1 It moves to the position A and contacts the positioning pin 15. In this state, the electromagnet 17 changes from OFF to ON, the iron core 18 attracts and fixes the movable iron piece 19, and holds the small aperture plate 3 at the position A.

Next, the coil L is energized in the reverse direction, and the rotor 10 and the rotor operating lever 11 start rotating clockwise. However, the small aperture plate 3 maintains the position A since the movable iron pin 3b is engaged with the movable iron piece 19. When the rotor 10 continues to rotate clockwise , the first operating region
In the Ru optimum begin contact by the rotor actuating lever pin 11b that is provided on the rotor actuating lever 11 in the sector closing lever 20 to have been stationary up to now as shown in FIG. 2 is rotated in the clockwise direction, the sector opening The lever 20 is turned counterclockwise. Accordingly, the sector opening / closing lever 20
With exposure opening two sectors 23 and 24 through the sector-off lever pin 20a are is rotated in the opposite direction to the physician each other begins to form on.

The sectors 23 and 24 correspond to the photometer 26 shown in FIG.
Information of subject from ISO, ISO information 2 of film sensitivity
7, the coil L is rotated to the exposure position determined by the control circuit 7, and then the coil L is reversely energized in the reverse direction (counterclockwise rotation) to return to the state of FIG. Thereafter, the electromagnet 17 changes from ON to OFF. Therefore, the small aperture plate 3 returns from the position A to the position B by the spring force of the spring 3c, and ends the operation. About the above operation, sector 2
FIG. 5A shows a time chart for each of the coils 3, 24, the electromagnet 17, the small aperture plate 3, and the coil L.

Next, as in the case where the subject is dark, a second program (shown by a solid line in FIG. 4) used by the program selecting means 1 shown in FIG. 3 until the shutter opening 2 is fully opened.
Is selected. When the release button 6 of the camera shown in FIG.
As a result, the coil L shown in FIG. By this energization, N is applied to the magnetic pole portion 9a of the stator 9.
An S pole is generated in the pole and pole portion 9b, and the rotor 10 rotates clockwise. As a result, the rotor operation lever 11
2, the rotor operating lever pin 11
a and the aperture operating member 12 do not contact each other,
Remain in contact with the engagement pin 14, so that the spring 12a
The small aperture plate 3 maintains the standby state at the second position B by the spring force of. Further, the electromagnet 17 remains in the OFF state.

The sectors 23 and 24 rotate to the exposure position determined by the brightness information and the like, and then the coil L is energized in the reverse direction to rotate the rotor 10 in the reverse direction (counterclockwise rotation), and the state shown in FIG. Return to About the above operation, sector 2
FIG. 5B shows a time chart for each of the coils 3, 24, the electromagnet 17, the small aperture plate 3, and the coil L. The motor control shutter device according to the embodiment of the present invention uses the electromagnet 17 to hold the position A after the movement of the small aperture plate 3, but as shown in FIG. The small aperture plate 103 may be configured to reciprocate between the first position A and the second position B every time the rotation operation is repeated.

Such another embodiment will be further described with reference to FIG. The rotor operating lever 111 is press-fitted and fixed to a swing motor M that can rotate forward and backward, and rotates integrally with the swing motor M. The rotor operating lever 111 includes a click 131 rotatably supported around a shaft 111a protruding from the rotor operating lever 111. The click 131 is normally biased clockwise by a spring 131a. Have been.

The click 131 is engaged with a ratchet portion 112b of a diaphragm operating member 112 which is rotatably supported around a shaft 113 projecting from a not-shown base plate. The aperture operating member 112 rotates the rotor operating lever 111 in a counterclockwise direction to operate until the second operating area is reached.
When Ru is, rotates in the clockwise direction via the click 131. The aperture operation member 112 is provided with five aperture operation member pins 112a, for example, at equal intervals. The small aperture plate 103 is rotatably supported around a shaft 104 protruding from the main plate, and can abut on the aperture operation member pin 112a. In order to prevent the aperture operation member 112 from rotating in the reverse direction, a pole 132 is provided rotatably supported around a shaft 133 protruding from the main plate. I agree.
The pole 132 is normally urged clockwise by a spring 132a.

Here, for example, the first program which uses only the small-diameter aperture 103a which is smaller than the shutter aperture 102 by the program selection means 1 of the camera shown in FIG.
The case where the program of (1) is selected will be described.
Since first release button 6 of the camera shown in FIG. 3 is a swing motor M shown in FIG. 6 via a motor drive unit 8 by the control circuit 7 to be pressed is rotated in the counterclockwise direction, the rotor actuating lever 111 To the second operating area,
The aperture operation member 112 is rotated clockwise through a click 131 provided on the rotor operation lever 111.

Thus, the aperture operating member pin 112a provided on the aperture operating member 112 can move the small aperture plate 103 to the first position A. Also, small drawing plate 1
03 is returned from the first position to the second position, if the swing motor M repeats the turning operation in the counterclockwise direction, the operation of the aperture operating member pin 112a, the rotor operating lever 111, and the spring 132 causes the position A to return to the position A. , Position B. In the embodiment shown in FIG. 6, the electromagnet is not required.

[0024] Incidentally, the rotor actuating lever 111 is rotated in the clockwise direction, the lever is to reach the first operating region,
As in the above embodiment, the two sectors can be rotated to the exposure position determined by the luminance information and the like. or,
In the motor control shutter device of the present invention, the sectors 23 and 24 are waiting at the position where the shutter opening 2 is closed in the initial state, but may be configured to wait at the opening position. Further, although a so-called swing motor having two poles is used as the motor, a step motor including a multi-pole rotor may be used.

[0025]

The driving source for the small aperture plate and the sector is the same motor. However, since the small aperture plate and the sector can be operated independently, the operating load applied to the motor can be made different. As a result, the motor output can be reduced, and the size and power consumption can be reduced. Further, since the operation timings of the small aperture plate and the sector can be completely separated, the degree of freedom in the operation sequence is increased, and the respective operation amounts of the small aperture plate and the sector are not restricted by each other. The amount of operation is sufficient. Therefore, the space factor is good and the device can be downsized.

[Brief description of the drawings]

FIG. 1 is a front view showing an initial state before a shutter operation of a motor control shutter device according to an embodiment of the present invention;

FIG. 2 is a configuration diagram of a sector and its related members in an initial state before a shutter operation of a motor control shutter device according to an embodiment of the present invention.

FIG. 3 is a control block diagram shown in FIGS. 1 and 2;

FIG. 4 shows E showing a first program and a second program.
v-value diagram

5A is a time chart showing the operation of each member when the first program is selected, and FIG. 5B is a time chart showing the operation of each member when the second program is selected.

FIG. 6 is a front view showing an initial state before a shutter operation of a motor control shutter device according to another embodiment.

FIG. 7 is a front view showing an initial state before a shutter operation of a conventional motor control shutter device.

[Explanation of symbols]

 2, 102 Shutter opening 3, 103 Small aperture plate 3a, 103a Aperture opening 11, 111 Rotor operating lever 12, 112 Aperture operating member 17 Electromagnet 20 Sector opening / closing lever

Continuation of the front page (56) References JP-A 3-119833 (JP, U) JP-A 63-125830 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 9 / 08-9/54

Claims (1)

(57) [Claims] A motor that rotates forward and reverse under the control of a control circuit, a sector that opens and closes a shutter opening, and a first position that has an aperture opening smaller in diameter than the shutter opening and that comes into the shutter opening. A small aperture plate that moves between a second position retracted from the inside of the shutter opening and a rotor operating member that is actuated by the motor to operate the sector or the small aperture plate;
In the first operation area, the sector is rotated, and the first
A motor control shutter device, wherein the sector and the small aperture plate are selectively operated in accordance with an operation region so as to move the small aperture plate in a second operation region different from the operation region .