JPS6188756A - Electromagnetic driving gear - Google Patents

Abstract

PURPOSE:To stabilize a gear at the time of moving, by arranging sheet coils provided for kinetic members symmetrically. CONSTITUTION:An electromagnetic driving gear used for a camera shutter device or the like is provided with a shutter front blade 1 and a shutter rear blade 3 for the primary and secondary kinetic members, and is rotated at the rotating centers r1, r2 respectively. The blades 1, 3 consist of circular sections 1b, 3b and sector sections 1a, 3a, and two coils 2, 4 of the same form are symmetrically arranged in the circular sections 1b, 3b. And upper and lower yokes 10, 11 are provided for the upper and lower sections of the circular sections 1b, 3b, and a permanent magnet 9 is provided for the lower section, and the upper and lower rotary shafts 5, 6 are supported by bearings 12, 18. In this manner, the both sheet coils 2, 4 are respectively and symmetrically arranged, and so the rotary shafts 5, 6 are vertically rotated, and the blades 1, 3 can be horizontally moved in a stable state.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an electromagnetic drive device used, for example, in a camera shutter device.

(Background Art) In recent years, a slit-type shutter device for cameras that uses electromagnetic force as its driving source has been proposed. This type of 7-layer device is placed in front of the silver halide film or the sensor, and has two blades that shield and expose light, respectively.These blades are equipped with coils, and the energization time for each coil is controlled. This is advantageous in that the shutter speed can be easily controlled.

An example in which a conventional electromagnetically driven shutter device is applied to an electronic camera will be explained with reference to FIG.

The figure shows the state in which the shutter blade is located at the initial position, the figure (B) shows the state in which the shutter blade has started traveling, and the figure (C) shows the state in which the shutter blade has finished traveling.

In the same figure ■, 31 is the shutter leading blade, shaft 3
6, and is urged counterclockwise by a spring 37. The shutter leading blade 3 has sector parts 31h and 31b of similar shapes symmetrically about the axis 36, and the large sector part 31 is connected to a solid-state image sensor 35 shown by a dot chain in the initial position.
A coil 33 is disposed in a portion 31b of the small sector. Reference numeral 32 denotes a sector part 32a which is rotatably supported by a shutter rear blade and is rotatably supported by a rotation 111136, and which has a similar shape symmetrically about the shaft 36.

32b in the same way, the large sector part 32h travels with a controlled time delay with respect to the sector part 31hK of the shutter leading blade 3, and performs three flashes and continuous flashes to the image sensor 35, and A coil 34 is disposed in the sector portion 32b.

The rear shutter blade 32 is similarly biased in the opposite direction by a spring 38.

In the initial state shown in FIG. 3(4), the leading shutter blade 31 and the trailing shutter blade 32 are at the position ah as shown in the figure.
However, the coil of the shutter leading blade 31 is connected to the coil of the shutter leading blade 31 from a control circuit (not shown). JK was added, and then after the scheduled time, the same first-class coil 3 of the blade 32 was added
Added to 4. A clockwise rotational torque is generated which is graphically determined by the direction of the current applied to the coils 33 and 34 and the direction of the magnetic flux generated from a permanent magnet (not shown), and the shutter leading blade 31 is rotated by the spring 37. The shutter transmission blade 32 rotates in the opening direction against the bias, and after the scheduled shutter time has elapsed, the shutter transmission blade 32 forms a slit S with respect to the front blade 31 as shown in FIG. 3CB). The rotation t is first turned clockwise against the bias of the spring 38, and exposure to the image sensor 35 is started. This state is shown in FIG. 3 (03).

Since the above-mentioned current continues to be applied to the coils 33 and 7 of the shutter leading blade 31 and the coil 34 of the trailing blade 32, the shutter leading blade 31 is fixed at a predetermined position as shown in FIG. The rear shutter blade 32 is stopped by a stopper (not shown) provided therein.
Similarly, the rotation is stopped at a predetermined position, and the exposure to the image sensor 35 is completed. Thereafter, when the current application is cut off, the shutter front blade 31 and the shutter rear blade 32 are moved in the counterclockwise direction by the springs 37 and 38 while maintaining the positional relationship shown in FIG. and returns to the initial position shown in FIG. 3 (5).

% of this: &&In a dynamic type medium-sized shutter device, if the leading shutter blade and the trailing shutter blade do not maintain a stable posture when traveling, large fluctuations will occur in the set shutter speed, resulting in exposure A problem arises in that it is no longer possible to sufficiently guarantee time accuracy.

Therefore, we have developed a conventional example using a lightweight flat coil.
3) will be explained.

A sector portion 41a symmetrical about its center of rotation.

4 shutter blades 41b are formed, and are rotatably supported on a shaft 42 at the center thereof, and a flat coil 43 is disposed in one sector portion 41bK.

In this case, even if a flat coil manufactured to be lightweight is used, since the 61 coil 43 is arranged in one sector part 41b, the weight i of the sector part 41b on the side where the coil is arranged is lost, and therefore the The shaft 42 that supports the tar blade 41 is not vertically supported, but is slightly inclined.

For this reason, when the shutter blade 41 is rotated, the shutter blade 41 also draws a top-notch trajectory due to the rotation of the shaft 42, which makes the movement of the shutter blade itself unstable, and This causes vibration in the bearing of the bearing section that supports the bearing 42, shortening the life of the bearing.

The above-mentioned phenomenon appears conspicuously in response to the difference in posture of the shutter device including the shutter blade 4 and the shaft 42, and becomes a serious problem for the running characteristics of the shutter blade.

In particular, when a wire-wound coil is used as the flat coil, it is troublesome to make the coil into a minute shape as shown in FIG. There is a drawback in terms of production in that it is difficult to align the sardine when installing it on the blade, and it is also disadvantageous in terms of maintenance because the same work must be done every time the coil is replaced.

(Objective) The present invention solves the drawbacks of the prior art described above, and provides an electric af) drive device which is relatively simple and privately constructed and which stabilizes the running of a moving part. The purpose is to

(Explanation based on Examples) Hereinafter, the means adopted by the present invention to achieve the above object will be explained using actual cases.

Figure 1 shows an example of a platform in which the train-type drive device of the present invention is applied to a camera shutter device, and the figure 1 shows each member constituting the shutter device separately, Figure (B) shows the side view after assembly.

Reference numeral 1 denotes a shutter leading blade as a first moving member formed of a thin metal plate or an insulating plate, and this shutter leading blade 1 has a circular portion 1b centered on the rotation center r1.
And this circular part ZbK is connected to the sector part 1a, and the above-mentioned circular part 1bKi-4 has the same shape.
The coils 2 are arranged symmetrically with respect to the rotation center r. The coil 2 is a sheet coil formed by photo-etching copper foil, etc., and is formed in the same shape. Note that the holes drilled symmetrically to the rotation center r of the shutter leading blade 1 are positioning holes.

Reference numeral 5 denotes a rotating shaft, on the lower end of which is attached a flange-shaped attachment part 5a, and on the upper end of which a head part 5b is attached, and 7, the run-shaped attachment part 6 & has two positioning holes,
Tori and to are perforated.

7 is a positioning pin, 7 is a positioning hole drilled in the flange-shaped mounting part 5&, and b! , the positioning hole drilled in the circular portion 1b of the shutter leading blade 1 is inserted into the positioning hole h4, and the central position of the rotating shaft 5 and the shutter leading blade 1 is determined. and fix it.

Reference numeral 3 denotes a rear shutter blade on the side of the second moving part, which is made of the same material as the shutter leading blade 1, and is connected to a circular portion 3b centered on the rotation center r. In the circular portion 3b, two sheet coils 4 having the same shape are arranged symmetrically with respect to the rotation center r. In addition, a hole h6 formed symmetrically with respect to the rotation center r of the rear shutter blade 3 is a positioning hole.

Reference numeral 6 denotes a rotating shaft, on the upper end of which is attached a 7-lunge-shaped attachment part 6a and on the lower end a head part 6b, and in the 7-lunge-shaped attachment part 6a, a positioning hole is bored. has been done. 8 is a positioning pin 1, which is attached to the positioning hole 11C drilled in the 7-shaped mounting part 6,
A positioning hole bored in the circular portion 3b of the rear shutter blade 3.

and h6, determine the center position of the rotating shaft 6 and the shutter rear blade 3, and fix the rotating shaft 6 and the shutter rear blade 3.

Reference numeral 11 denotes an upper yoke, a spacer 19 is fixed to one end of the upper yoke, a bearing 12 is provided on the upper surface of the yoke 11, and position regulating pins 13 are provided at both ends of the yoke 11.
and Z3m have been planted. A lever 14 has a hole 14b at one end and a protrusion 14a at the other end, and a spring 16 is mounted between its side surface and a chassis (not shown). The rotating shaft 5 is supported by a bearing 12, and the head portion 5b of the rotating shaft 5 is inserted into the hole 14b of the lever 14. Since it is a-, sha, ta tip feather &1
is biased in the i direction by a spring 16 with the rotating shaft 5 as the center of rotation. The above-mentioned position regulating pins 13 and 13g come into contact with the protrusion 14& of the lever 14, thereby regulating the rotation of the lever 14.

The JO is a lower yoke, and a permanent magnet 9 having a hole 9a is provided on its upper surface, and a bearing 1 is provided on its lower surface.
8 is provided, and the position indicated by the dotted line 2 - regulation bin 13'
and 13'a are planted. A lever 15 has a hole 15b at one end and a protrusion 15a at the other end, and a spring 17 is cut out between the side surface of the lever 15 and a chassis (not shown). Insert the rotating shaft 6 into the bearing 18 through the hole 9a of the permanent magnet 9, and insert the rotating shaft 6 through the hole 1 of the lever 15.
Since the head h6b of the rotary shaft 6 is inserted into the head h6b of the rotary shaft 6 and fixed thereto, the rear shutter blade 3 is biased by the spring 17 and is urged clockwise around the rotary shaft 6 as the center of rotation. has been done. The spacer 19 fixed to the upper yoke 1 described above is fixed to the lower yoke 10.

As mentioned above, the shapes of the shutter front blade 1 and the shutter rear blade 3 are composed of the circular parts 1b and 3b and the sector parts 1a and 3a connected to the circular parts 1b and 3b, and their centers of gravity are located at the center of rotation r1. and rfi, the circular parts 1b and 3bL have a phase difference of 180' from the connecting position of the sector parts 1a and 3a.
: The thickness of only the D end is increased to eliminate the unbalance of one seat with the sector portions 1a and 3&, and it is orthogonal to the dark blue connecting the centers of the sector portions 1a and 3& with the rotation centers r1 and r. By arranging the sheet coils 2 and 4 symmetrically in the direction of
, respectively. The rotation shafts 5 and 6, the shutter leading blade 1, and the shutter trailing blade 3 are connected to positioning pins? and 8, the positioning hole, and the positioning action played by the latches, it is possible to fix and attach the two parts by aligning their respective axes. Further, the rotating shafts 5 and 6 are connected to bearings 12 and 18, and the lever 1
Of course, it is necessary to install the lever so that it is located in the center of the hole 14b of the lever 15 and the hole isb of the lever 15.

The 'R& small moving type shutter assembly assembled in this way is also shown in Figure 1 (B), viewed from the metal side.

Next, N & h i4! The operation of the + type shutter device will be explained.

When a current is applied to the sheet coil 2 of the shutter leading blade 1 and the sheet coil 4 of the shutter trailing blade 3, a current is applied depending on the direction of the current flowing through the sheet coils 2 and 4 and the direction of the magnetic flux generated by the permanent six stones 9. Torque is generated in the direction determined logically, and the leading shutter blade 1 begins to rotate counterclockwise against the force of the spring J6, and then the trailing shutter blade 3 also rotates counterclockwise. Resisting the force, it begins to rotate in the anti-ff1il+ and i1 directions while forming a slit in the shutter leading blade 1. An image sensor (not shown) is exposed to light through a slit formed between the shutter leading blade 1 and the shutter trailing blade 3. Shutter front blade 1 rotates h
5, the protrusion 14 & of the lever 14 is connected to the position regulating pin 1.
3%, and the shutter rear blade 3 is also connected to the protrusion 15 of the lever 15 via the rotating shaft 6.
h is stopped at the position where it comes into contact with the position regulating bin 13'a. After that, when the application of current to the sheet coils 2 and 4 is cut off, the shutter leading blade 1 is rotated clockwise by the biasing force of the spring 16, and the projection 14 of the lever 14 is rotated clockwise.
1 is stopped at the position where it contacts the position regulating pin 13,
In addition, the rear shutter blade 3 is also rotated clockwise by the urging force of the spring 17 in the closed state with respect to the leading shutter blade 1, and the protrusion 15a of the lever 15 is moved against the position regulating pin 13.
When it comes into contact with ', it is stopped and returns to the initial state.

Since the foot coils 2 and 4 are arranged symmetrically in the shutter front fang &1 and the shutter rear fang 1!3, the rotation 4? [15 and 6 rotate while maintaining the vertical state, so that the shutter blade 1 and the rear shutter blade 3 run stably while maintaining the horizontal position without exhibiting top motion: l+cA ) and (B) show modified examples of shutter hair roots.

In the same figure (G), the shutter blade 21 is connected to the rotation shaft 22.
It consists of a circular boiling point 21b centered at
, and the rotation shaft 22, and the sheet coils 23 are arranged symmetrically with respect to the rotation shaft 22. Same figure (B)
In this case, one blade 24 of the 7-year-old has a circular portion 24b centered on the rotating shaft 25 and a sector portion 24 connected to this circular portion 24b.
* Tokaranashi and 4 identically shaped sheet coils 2
6 are arranged symmetrically about the rotation axis 25.

In addition, the above-mentioned embodiment is an electromagnetic type part! uj i::II'
Although the case where the i is applied to a shutter device for a camera will be described, it goes without saying that the present invention can be applied to any type of sr-type drive device in which a sheet coil is arranged in a moving member. It is.

(Effects) As explained above, according to the present invention, since the sheet coils provided on the moving member are arranged symmetrically, there is no difference in posture between the moving member and the supporting member that supports it, and therefore When the moving member is driven, it is possible to stabilize the running of the member.

4. Simple explanation of the floor surface Figures 1 and 2 show an embodiment in which the electromagnetic drive device of the present invention is applied to a shutter device for a camera.
Figure 1 is a perspective view showing each member of the shutter device separated, Figure 2 (B) is a side view of the assembled members shown in Figure 2.
B) is 2 when arranging the sheet coil on the shutter blade.
3 shows a conventional shutter device, in which the shutter device is shown in the initial state, (B) is in the running state, and (C) is the top view in the completed state. B) is a top view of the shutter blade.

1 is the front shutter blade, 3 is the shutter, rear blade, 2 and 4
is a sheet coil, 5 and 6 are rotating shafts, 5a and 61 are flange-like mounting parts, 5b and 6b are head parts, 7 and 8 are positioning pins, 9 is a permanent magnet, 10 is a lower yoke, 1 is an upper yoke, 12 and 18 are bearings, 13 and 13a and 13' and 13'a are position regulating pins, and 14 and 15 are levers 16 and 1.
7 indicates a spring.

Claims (1)

[Claims] (1) The moving member is driven by energizing a coil provided on the moving member and positioned in a magnetic field, the sheet coil being symmetrically formed; and the sheet coil being arranged symmetrically; An electromagnetic drive device comprising a moving member supported by a shaft.