JP2528239Y2 - Sector switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sector opening / closing device for performing opening / closing operations of a sector for performing an exposure operation of a camera by forward / reverse rotation of a rotor.

2. Description of the Related Art As such a sector opening / closing device, there is a device disclosed in, for example, Japanese Patent Application Laid-Open No. 61-48819. As shown in FIG. 7, this conventional sector opening / closing device has two outer circumferential surfaces.
A coil 101 is arranged near a rotor 102 having two magnetic poles. When the coil 101 is composed of two coil L ₁ and L _2, energizing the single coil L ₁ of them,
A magnetic field is applied to the rotor 102 to rotate the rotor 102, whereby the lever 103 connected to the rotor 102 rotates around the same rotation shaft 104 as the rotor 102 against the spring 107. By the rotation of the lever 103, the sectors 105 and 106 connected to both ends thereof are driven to move relative to each other in the opposite directions, and the holes 105a and 106a formed respectively in the two by the relative movement of the two move to the eighth position. As shown in the figure, the shutter holes 108 are opened by overlapping. When the starting the energization of the coil L ₂ by blocking the energization of the coil L ₁ after a predetermined time, the rotor 102 is reversed spring 1
The urging force of 07 is also applied, and the sectors 105 and 106 rapidly return to the original positions as shown in FIG. 7, the holes 105a and 106a are separated again, and the shutter hole 108 is closed.

[Problems to be solved by the invention]

However, in such a conventional sector opening / closing device, when closing the shutter hole 108, the sectors 105, 106
Because the spring 107 is connected to the lever 103 that drives the
Conversely, when opening the shutter hole 108, the lever 103
Since it is necessary to rotate against the urging force of 107, the load torque increases, and there is a problem that the current consumption of the rotor 102 for driving the lever 103, that is, the coil 101 increases and the size of the coil increases. In addition, since the coil 101 must be arranged so as to surround a part of the rotor 102, it is difficult to shorten the axial length of the rotating shaft 104 of the rotor 102, and the degree of freedom in design such as making the device thinner is reduced. Is lowering. Furthermore, in the above-mentioned conventional one, it is necessary to match the magnetic pole direction of the rotor 102 and the magnetic field direction of the coil 101 and the magnetic pole of the rotor 102 and the lever 103 with a predetermined phase. There is a problem that it is difficult to finely adjust the phase. Then, this invention makes it a subject to solve such a problem.

[Means for solving the problem]

In order to solve the above problem, the present invention provides a rotor having a plurality of permanent magnetic poles on a peripheral surface, a stator having a plurality of pole portions facing the peripheral surface of the rotor, and a magnetic pole at a pole portion of the stator when energized. A sector opening / closing device that opens and closes a sector via the rotor that is rotated by energization of the coil, wherein each of the plurality of pole portions of the stator has a one-to-one correspondence with a plurality of magnetic poles of the rotor. Correspondingly, by providing a convex portion such that the gap with the rotor becomes narrower than other portions, when the coil is not energized, the magnetic pole of the rotor is attracted to the convex portion to hold the sector in the closed position, and The sector opening / closing device includes an opening / closing lever mounted on the rotor at a position where a magnetic pole of the stator and a magnetic pole of the peripheral surface of the rotor are attracted when the coil is energized and the positional relationship is stable. A structure having a further said sector switchgear, positional relationship when de-energized the coil in which a structure having an adjusting means for adjusting the initial position of the opening lever when the stable.

[Action]

According to the sector opening / closing device having such a configuration, the magnetic portion provided close to the rotor peripheral surface corresponding to the magnetic pole of the rotor holds the sector in the closed position, so that it is necessary to provide a spring as in the conventional example. There is no. For this reason, the load torque when the sector is opened is reduced, so that the sector drive can be performed by a low-output electromagnetic drive device, so that the size can be reduced and the current consumption can be reduced.

Also, unlike the conventional example, the present invention rotates the rotor by energizing the coil to generate a magnetic pole at the pole portion of the stator, thereby increasing the degree of freedom in design and facilitating thinning and miniaturization. In addition to this, the direction of rotation of the rotor when the coil is energized is determined by the shape of the pole portion of the stator, so the regulating means for regulating the direction of rotation of the rotor for regulating the direction of rotation of the rotor when the coil is not energized Can be abolished.

In addition, by providing the opening / closing lever on the rotor so that the opening / closing lever is at a predetermined position in a state where the coil is energized, the phase of the magnetic pole of the rotor and the opening / closing lever can be easily matched.

Further, the phase of the rotor and the stator can be easily adjusted at the time of assembly by adjusting the initial position of the opening / closing lever in a state where power is not supplied to the coil by the adjusting means.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show one embodiment of the sector opening / closing device according to the present invention.

FIG. 1 is a configuration diagram of a sector opening / closing device before a shutter is operated. In FIG. 1, reference numeral 1 denotes a rotor, and the rotor 1 has two magnetic poles N and S which are permanently magnetized on a peripheral surface thereof. The rotor 1 is fixed to a rotor shaft 2, and the rotor shaft 2 is rotatably supported by an upper plate 3 and a middle plate 4 as shown in FIG. An opening / closing lever 5 to be described later is fixed to a lower end portion of the rotor shaft 2 in FIG.

In FIG. 1, reference numeral 6 denotes a stator, which has a substantially U-shape and has two legs 6a and 6b. At the tip of each of the two legs 6a, 6b, a pole 6c,
6d are formed, and these pole portions 6c and 6d are arranged to face the peripheral surface of the rotor 1. The pole portions 6c and 6d are formed with salient pole portions 6e and 6f (magnetic portions) in which a gap with respect to the outer periphery of the rotor 1 is partially narrowed, and the salient pole portions 6e and 6f are symmetrically positioned with respect to the rotor shaft 2 with respect to each other. Are located in

A coil L is wound around the leg 6a of the stator 6, and the coil L is connected to a control circuit 12 via a driver circuit 11. By energizing the coil L under the control of the control circuit 12, magnetic poles can be generated in the pole portions 6c and 6d of the stator 6.

Reference numeral 5 denotes an opening / closing lever, which is press-fitted and fixed to the rotor shaft 2. The opening / closing lever 5 has at one end a pin 5a which engages with a hole of the sector 7, 8 so as to drive the sector 7, 8 by rotating about the rotor shaft 2. When the opening and closing lever 5 closes the sectors 7 and 8,
The other end has an arm 5b that comes into contact with an adjustment pin 9 described later.

In the sectors 7 and 8, openings 7a and 8a for exposure are formed. The sector 7 is rotatably supported around the rotor shaft 2 at the center of the opening and closing lever 5 so as to operate integrally with the opening and closing lever 5, and a pin 5a at one end of the opening and closing lever 5 is fitted into the hole. (See FIG. 2). The sector 8 is rotatably supported around the pin 4a of the middle plate 4, and the pin 5a of the opening / closing lever 5 is fitted into the long hole 8b and driven by the pin 5a. As shown in FIG. 2, the sectors 7, 8 are both arranged between the middle plate 4 and the lower plate 10. Pins 4b are planted on the middle plate 4,
As shown in FIG. 3, when the sector 8 is rotated in the fully opened direction by the pin 5a, the sector 8 abuts on the pin 4b to restrict further rotation. As shown in FIG. 1, the adjusting pin 9 regulates the position of the sectors 7 and 8 in the closing direction by contacting the arm 5b of the opening / closing lever 5, and as shown in FIG. The press-fit portion 9a is press-fitted and fixed to the intermediate plate 4 so that the press-fit portion 9a cannot be rotated unless the torque exceeds a predetermined value. The adjusting pin 9 has a pin portion 9b which is in contact with the arm portion 5b of the opening / closing lever 5 and is formed eccentrically with the press-fitting portion 9a. Is rotated, the pin portion 9b rotates eccentrically.

The control circuit 12 in FIG. 1 determines the energizing time of the coil L based on luminance information of a subject, sensitivity information of a film, and the like from a photometric unit (not shown), and outputs a drive signal of the rotor 1 to the driver circuit 11. This drive signal supplies the coil L with an output pulse generated by amplification and conversion in the driver circuit 11.

The phase relationship between the rotor 1 and the stator 6, that is, the angular positions a, b, c, d at which the magnetic poles of the rotor 1 stop as shown in FIG.
Is as follows. First, as shown in FIG. 4, a indicates the magnetic pole position of the rotor 1 when the coil L is energized in a state where the rotor 1 is not regulated at all, and the magnetic pole position of the stator 6. b is also as shown in FIG.
When the rotation of the rotor 1 is unregulated and the coil L is de-energized, it stops due to the natural magnetic coupling force between the salient pole portions 6e and 6f (not magnetized) of the stator 6 and the magnetic poles of the rotor 1. It is a position to do. c is a position when the arm 5b of the opening / closing lever 5 is restricted by the adjustment pin 9, as shown in FIG. D is the position when the sector 8 is restricted by the pin 4b as shown in FIG.

Furthermore, the angle between a, b, c, and d is α, and the angle between a and
Assuming that β is the total operating angle of the open / close lever 5, γ ₁ is the distance between bc, and γ ₂ is the distance between the ad, α <90 °, α> β, γ ₁ > 0, γ ₂ > 0 are determined. Note that γ ₁ is an adjustment amount by the adjustment pin 9,
It is set in consideration of the magnetic coupling force between the magnetic pole of the rotor 1 and the salient pole portions 6e and 6f of the stator 6. Further, γ ₂ is an angle provided for ensuring that the closing operation is performed with the d being slightly before the fully opened state in the exposure operation.

As shown in FIG. 4, the connection between the opening / closing lever 5 and the rotor shaft 2 is such that the rotation of the rotor 1 is not regulated at all and the coil L is energized. For example, it is press-fitted and fixed while being positioned by, for example, a method of matching the direction of the arm 5b of the opening / closing lever 5 with the index 4c provided on the middle plate 4, or a method using an assembling jig (not shown).

In such a sector opening and closing device, the control circuit 12 determines the energization time of the coil L as described above by performing a release operation of the camera in the state of FIG.
The coil L is energized via 11. When the coil L is energized, an N-pole is generated at the pole 6c of the stator 6 and an S-pole is generated at the pole 6d, and the rotor 1 starts rotating clockwise. By this rotation, via the pin 5a of the shutter lever 5 starts exposure operation sectors 7,8 is rotated, the sector 7 and 8 after the predetermined time t ₁ is a predetermined amount open (see FIG. 5), At this time, the driver circuit 11 immediately energizes the coil L in the reverse direction, and when an S pole is generated at the pole portion 6c and an N pole is generated at the pole portion 6d of the stator 6, the rotor 1 rapidly reverses. Sector 7,8 via the pin 5a of the shutter lever 5 by the reverse rotation of the rotor 1 is restored to its original state (FIG. 1), the exposure operation after a predetermined time t ₂ is completed (see FIG. 5). Sector energization time t ₂ at the time of closing the sector 7 and 8
By setting a longer time than the actual closing operation time of the closing operation, the bound (vibration) of the sectors 7, 8 and the opening / closing lever 5 at the time of closing can be suppressed and prevented.

If the sectors 7 and 8 cannot be accurately operated due to the dimensions and assembly errors of the sector opening / closing parts such as the rotor 1, the rotor shaft 2 and the opening / closing lever 5, the slot 9c of the adjusting pin 9 is inserted into a tool such as a screwdriver. By rotating using the pin
9b rotates eccentrically and the rotation center of the adjustment pin 9 and the opening / closing lever 5
5 changes, the stop position c of the rotor 1 changes, and the angles γ ₁ and β change. Therefore, the sector operation due to the error shown by the dashed line in FIG.
It can be easily modified to proper sector operation as shown by the solid line.

In the embodiment, the adjusting pins 9 are provided to adjust the operation of the sectors 7 and 8. However, when the adjusting means is not provided, the adjusting pins 9 may be simply omitted, and some position regulation instead of the adjusting pins 9 may be performed. No means are required. In other words, when the adjustment pin 9 is eliminated, the position of the rotor when the coil is not energized is the same as that in FIG. 4, and r1 = 0. Further, in the embodiment, the opening / closing lever 5 is directly attached to the rotor shaft 2, but the pinion is attached to the rotor shaft in phase alignment, and further, the pinion and the opening / closing lever or the ring member known as a sector opening / closing device mechanism are phase matched. The relationship may be configured.

In the embodiment, when the sectors 7 and 8 are closed, the coil L
However, when high speed is not required, the sectors may be closed only by the natural magnetic coupling force between the rotor and the stator when the sectors are closed.

In the embodiment, the phase γ ₂ between the magnetic pole position of the stator when the coil is energized and the magnetic pole position of the rotor 1 when the operation of the sector in the fully open direction is restricted is set to γ ₂ > 0.
This phase γ ₂ may be set to γ ₂ = 0 if no current is supplied in the reverse direction when closing the sector.

Further, in the embodiment, a portion in which the gap between the stator and the rotor is partially narrowed is provided as a magnetic material,
The gap between the stator and the rotor may be all uniform, and a magnetic material as a separate member may be provided as a magnetic part at a position where the rotor is to be stopped by the natural magnetic coupling force with the rotor when the coil is not energized.

Further, in the embodiment, as the adjusting means of the stop position of the opening / closing lever 5, the adjusting pin 9 having an eccentric pin is used.
Other known position adjusting means may be used.

In the above-described embodiment, the magnetic section is provided so as to urge the sector to the most closed position when the power is not supplied. However, when the shutter is normally configured to be in the open position as in a single-lens reflex camera, May be arranged such that the magnetic portion is located at a position where the sector is most open.

[Effect of the invention]

As described above, according to the present invention, it is necessary to provide a spring as in the conventional example, since the magnetic portion provided close to the rotor peripheral surface corresponding to the magnetic pole of the rotor holds the sector at a predetermined position. Absent. For this reason, the load torque when the sector is opened is reduced, so that the sector drive can be performed by a low-output electromagnetic drive device, so that the size can be reduced and the current consumption can be reduced.

Also, unlike the conventional example, the present invention rotates the rotor by energizing the coil to generate a magnetic pole at the pole portion of the stator, thereby increasing the degree of freedom in design and facilitating thinning and miniaturization. In addition to this, the direction of rotation of the rotor when the coil is energized is determined by the shape of the pole portion of the stator, so the regulating means for regulating the direction of rotation of the rotor for regulating the direction of rotation of the rotor when the coil is not energized Can be abolished.

In addition, by providing the opening / closing lever on the rotor so that the opening / closing lever is at a predetermined position in a state where the coil is energized, the phase of the magnetic pole of the rotor and the opening / closing lever can be easily matched.

Further, the phase of the rotor and the stator can be easily adjusted at the time of assembly by adjusting the initial position of the opening / closing lever in a state where power is not supplied to the coil by the adjusting means.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a structural view of the sector opening / closing device before the shutter is operated, FIG. 2 is a sectional view of the sector opening / closing device, and FIG. FIG. 4 is a configuration diagram of the sector opening / closing device at the time of shutter opening operation, FIG. 4 is an explanatory diagram when the opening / closing lever is mounted on the rotor shaft, FIGS. 5 (a) and (b) are time charts of the sector operation and the coil energized state, respectively. FIG. 6 and FIG. 7 are configuration diagrams for explaining a conventional sector opening / closing device. 1,51 ... rotor, 5 ... open / close lever 6,52,53 ... stator 6e, 6f, 52e ... magnetic part 7,8 ... sector, 9 ... adjustment means N, S ... magnetic pole, L, L _1, L ₂ ...... coil

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seichi Konno 934-13 Shikato, Yotsukaido-shi, Chiba Co., Ltd. Seikosha Chiba Works (56) References JP-A-64-59224 (JP, A) JP-A Sho 63-36230 (JP, A)

Claims (4)

(57) [Scope of request for utility model registration] A rotor having a plurality of permanent magnets on a peripheral surface thereof;
A stator having a plurality of pole portions facing the peripheral surface of the rotor, and a coil for generating magnetic poles in the pole portions of the stator when energized, and opening and closing sectors via the rotor rotated by energization of the coils. In the sector opening / closing device to be performed, the stator has, on each of a plurality of pole portions, a convex portion in which a gap with the rotor is narrower than other portions in one-to-one correspondence with a plurality of magnetic poles of the rotor. A sector opening / closing device, characterized in that: 2. An opening / closing lever attached to the rotor at a position where the sector is most opened when a magnetic pole of the stator and a magnetic pole of the rotor peripheral surface are attracted to each other when the coil is energized and the positional relationship is stabilized. The sector opening / closing device according to claim 1, wherein: 3. An opening / closing lever mounted on the rotor at a position where the sector is most closed when the magnetic poles of the stator and the magnetic poles on the peripheral surface of the rotor are attracted when the coil is energized and the positional relationship is stabilized. The sector opening / closing device according to claim 1, further comprising: 4. The sector opening / closing device according to claim 2, further comprising adjusting means for adjusting an initial position of the opening / closing lever when a positional relationship is stabilized when the coil is not energized.