JP3459087B2 - Camera 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 camera shutter device characterized by a shutter blade drive mechanism.

[0002]

2. Description of the Related Art In recent years, along with the electrification of cameras, there has been a demand for motors that open and close the shutter blades.
However, since it is difficult for the motor to instantaneously increase the speed, the ability of the shutter blades to travel at high speed is inferior to that of the spring. To compensate for this, add two motors.
If more than one unit is used, or if only one motor is used, there is no choice but to rely on a large motor, and in such a case, the shutter device inevitably becomes large and the cost becomes high.

[0003]

In order to solve such a problem, development of a high performance small motor is awaited, but at present, it is expensive and it is difficult to put it into practical use as a small camera. Another method is to reduce the load on the motor, and the problem is not only to reduce the number of parts and the weight, but also to reduce the frictional resistance between the parts. In particular, the drive ring arranged concentrically with the exposure opening is of a type in which the shutter blades are opened and closed by the reciprocating movement thereof, the frictional resistance due to this drive ring is extremely large. The drive ring has a quadrilateral cross section, of which at least 3
This is because the sides are friction surfaces with other parts.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a plurality of shutter blades arranged at substantially equal intervals around the exposure opening.
It is an object of the present invention to provide a drive mechanism that minimizes the number of parts in a camera shutter device that is driven by a single motor and that has an extremely small frictional resistance.

[0005]

In order to achieve the above object, the camera shutter device of the present invention is arranged around the exposure opening at substantially equal intervals, each having a fulcrum part and a moving point part. a plurality of shutter blades and said plurality of shutters be formed annularly so as to surround the exposure opening for opening and closing the exposure opening by the same rotational direction f reciprocating rotation at the same time as a fulcrum each fulcrum section has Each moving point of the blade and each rotation
It is possible to connect them to each other at the time of operation.
The distance between each fulcrum and each movement is not changed
While maintaining the mutual parallel relationship between the plurality of line segments connecting the point portions, the plurality of shutter blades are set with each fulcrum portion as a fulcrum.
A link member that reciprocally swings while rotating; a moving magnet type motor that reciprocally rotates a rotor by electrical control; a rotor integrally formed with the rotor and connected to the link member; And a drive member that reciprocally swings the link member by reciprocating rotation of the rotor.

[0006]

When the moving magnet type motor is energized when the camera is released, the rotor rotates in one direction by a predetermined angle. The drive member integrally formed with the rotor rotates a predetermined angle together with the rotor to move the link member from its initial position. Since the link member is connected to the moving point portion of each shutter blade, the moving movement of the link member becomes a swinging movement with the fulcrum portion of each shutter blade as a fulcrum, thereby opening the shutter blade. When electricity is applied to the motor in the opposite direction after a predetermined time has passed, the rotor rotates in the opposite direction to the above, swings the link member in the opposite direction via the drive member, and the shutter blade The exposure is completed by closing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. 1 is a plan view showing a closed state of the shutter blades, and FIG. 2 is a plan view showing an opened state of the shutter blades. FIG. 3 is a sectional view taken along line I-I of FIG.

In the figure, reference numeral 1 is a shutter base plate having an opening 1a and a window 1b, and pins 1c, 1d, 1e, 1
f, 1g is planted. 1 and 2, the window 1b is omitted and the outer shape of the shutter base plate 1 and the opening 1a are shown by a chain double-dashed line. A moving magnet type motor 2 has a drive pin 2a that reciprocally rotates integrally with a well-known rotor (not shown). This moving magnet type motor is attached to the shutter base plate 1 by appropriate means, and the drive pin 2a penetrates the window 1b and projects to the back of the shutter base plate 1 as shown in FIG. Reference numeral 3 is a link member, and in FIGS. 1 and 2, the pin 3a is planted on the front surface side and the pins 3b, 3c, 3d, 3e, 3f are planted on the back surface side,
Further, it has a slot 3g that fits into the large diameter portion of the pin 1f. 4 is a connecting lever, which is a drive pin 2a and a pin 3
It is rotatably connected at a. Reference numerals 5, 6, 7, and 8.9 denote shutter blades, which are the pins 1c of the shutter base plate 1,
1d, 1e, 1f, 1g, and the pin 3 of the link member 3
It is pivotally supported by b, 3c, 3d, 3e and 3f. Reference numeral 10 is a cover plate having an opening 10a and fixed to the shutter base plate 1 by an appropriate means. The shutter blades 5, 6,
Pins 1c, 1d, 1e, 1 serving as fulcrums for 7, 8, 9
f, 1g and pins 3b, 3c, 3d, 3 which are the moving point parts
The line segments connecting e and 3f are arranged at substantially equal intervals and are substantially parallel to each other.

Next, the operation will be described. When the shutter is released in FIG. 1 showing the shutter closed state, the moving magnet type motor 2 is energized and the rotor (not shown) rotates counterclockwise. As a result, the drive pin 2a integrated with the rotor also rotates, so that the link member 3 is moved via the connecting lever 4 using the pin 1f as a guide. The movement of the link member 3 at this time is performed by the pins 1c, 1d,
It is a swinging motion with each point of 1e, 1f, 1g as a fulcrum,
Thereby, the shutter blades 5, 6, 7, 8 and 9 are rotated counterclockwise to open the opening 1a as shown in FIG. When a predetermined time has passed and the moving magnet type motor 2 is energized in the opposite direction to the above, the drive pin 2
2a is rotated clockwise in FIG. Therefore, the link member 3 is moved from the position of FIG. 2 to the position of FIG. 1 through the connecting lever 4 with the pin 1f as a guide. The return movement of the link member 3 is performed by the pins 1c, 1d, 1e, 1f, 1
g is used as a fulcrum, and each shutter blade 5, 6, 7,
Accordingly, 8 and 9 are also rotated clockwise to close the opening 1a and return to the position shown in FIG.

In the above embodiment, the link member 3 is formed in an annular shape, but it may be formed in a C shape by removing a part between the connecting portions with the shutter blades. Further, in the embodiment, the movement of the drive pin 2a is transmitted to the link member 3 via the connecting lever 4, but this is due to the design concept of the entire shutter device.
It goes without saying that the configuration in which a is directly connected to the link member 3 and the connection lever 4 is omitted is an ideal form as an embodiment of the present invention.

[0011]

As described above, according to the present invention, a link member for simultaneously actuating a plurality of shutter blades arranged at substantially equal intervals around the exposure opening is not a fixing member such as a shutter base plate. Since the sliding contact is made only on one side of the quadrilateral in cross section, the quadrilateral is rotated along a locus concentric with the exposure opening, and three sides of the quadrangular section are friction surfaces. The frictional resistance is extremely small compared to, and since the link member and the moving magnet type motor can be directly connected or can be connected with the minimum number of parts,
Without using an expensive and high-performance motor or using a plurality of motors, it is possible to drive the shutter blades at a higher speed than in the prior art by using a single conventional moving magnet type motor.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, showing a closed state of shutter blades.

FIG. 2 is a plan view showing an embodiment of the present invention, showing an opened state of shutter blades.

FIG. 3 is a sectional view taken along line I-I of FIG.

[Explanation of symbols]

1 shutter base plate 1a, 10a opening 1b windows 1c, 1d, 1e, 1f, 1g, 3a, 3b, 3c, 3
d, 3e, 3f Pin 2 Moving magnet type motor 2a Drive pin 3 Link member 3g Slot 4 Connecting lever 5, 6, 7, 8, 9 Shutter blade 10 Cover plate

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-166532 (JP, A) JP-A-57-86823 (JP, A) Actually opened 63-130738 (JP, U) Actually opened 5- 69741 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03B 9/10

Claims (2)

(57) [Claims] 1. A fulcrum is provided around the exposure opening at substantially equal intervals, each having a fulcrum part and a fulcrum part.
A plurality of shutter blades for opening and closing the exposure opening by the same rotational direction F reciprocating rotation simultaneously, each of the plurality of shutter <br/> data vanes have been formed into an annular shape so as to surround the exposure opening Operates by being rotatably connected to the moving point
Sometimes without changing the distance between the connecting parts and the fulcrum parts
Moreover, a plurality of line segments connecting the fulcrum portions and the moving point portions
With each fulcrum as a fulcrum while maintaining mutual parallel relationship
A link member that reciprocally swings while rotating the plurality of shutter blades, a moving magnet-type motor that reciprocally rotates the rotor by electrical control, and the link integrally formed with the rotor. A shutter device for a camera, comprising: a drive member that is connected to a member and that reciprocally swings the link member by reciprocating rotation of the rotor. 2. The shutter device for a camera according to claim 1, wherein the driving member is connected to the link member via a connecting member.