JP2550192B2 - Aperture device - Google Patents

Description

The present invention relates to a diaphragm device used in optical equipment such as a video camera.

[Conventional technology]

FIG. 5 is an exploded perspective view showing an example of a diaphragm device that has been conventionally manufactured. In the figure, 1 is a base plate of the diaphragm device, 2 is a diaphragm blade drive motor fixed to one surface (upper surface in FIG. 5) of the base plate 1, and 3 is the other surface of the base plate 1 (the fifth surface). The motor 2 is arranged on the lower surface in the figure).
The aperture blade drive levers 4 and 5 which are rotated in the direction of the arrow around the axis of are locked to both ends of the lever 3 and are moved in the directions of the arrows f ₁ and f ₂ when the lever 3 is rotated. Aperture blades, 6 is a cover fixed to the base plate 1 on the other surface of the base plate 1 (that is, the lower surface in FIG. 5), 7 is a motor drive printed wiring board attached to the base plate 1, and 8 is a diaphragm blade 4 is an ND filter fixed to the opening edge of 4.

An optical path hole 1-1 for passing photographing light is provided through the main plate 1, and a cylindrical yoke support seat 1-2 for motor installation is provided at a position adjacent to the optical path hole by integrally molding with the main plate. Has been done. Two coil bobbin fixing rods 1-3 and 1-4 are similarly formed integrally with the base plate 1 inside the yoke support seat 1-2, and further, outside the yoke support seat 1-1. At a position, a pair of printed wiring board mounting columns 1-5 and 1-6 are similarly formed integrally with the main board 1 so as to project.
Holes 1-3a, 1-4a, 1 for screwing a screw described later are formed in the respective tip surfaces of the coil bobbin fixing rods 1-3 and 1-4 and the tip surfaces of the columns 1-5 and 1-6. −5a, 1
-6a is open.

A shaft hole 1-7 for inserting a rotor shaft, which will be described later, is formed at a central position of the yoke support seat 1-2 on the main plate surface inside the yoke support seat 1-2. The rotor shaft of the motor 2 is inserted into the rotor 7, and the rotor shaft projects from the lower surface of the main plate 1.

Protrusions 1-8 and 1-9 are formed on both side surfaces of the base plate 1 and through which screw holes 1-8a and 1-9a are provided. The protrusions 1-8 and 1-9 are positioned so as to face the ear pieces 6-1 and 6-2 provided on both sides of the cover 6, and the ear pieces 6-
The cover 6 is fixed to the main plate 1 by inserting screws (not shown) into the holes 6-1a and 6-2a and the screw holes 1-8a and 1-9a penetrating through 1 and 6-2 and tightening them. It is supposed to be done. Square protrusion 1-10 on the left end face of the main plate 1.
And 1-11 are formed, and the square protrusions 1-10 and 1-11 are inserted into the square holes 6-3a and 6-4a of the projecting pieces 6-3 and 6-4 provided on the end face of the cover 6. Thus, the cover 6 can be attached to the lower surface side of the main plate. Further, a hole 6-5 is formed through the right end of the cover 6, and a screw hole aligned with the hole 6-5 is formed in the main plate 1.
Is inserted into the hole 6-5 and screwed into the screw hole, so that the cover 6 is fastened to the main plate 1.

The aperture blade drive lever 3 has a boss 3-with a hole in the center thereof.
1, and pins 3-2 and 3-3 engaging with the diaphragm blades are provided at both ends in a protruding manner. The rotor shaft of the motor 2 is fitted in the hole of the boss 3-1. The pin 3-2 is slidably inserted into the lateral groove 4-1 of the diaphragm blade 4, and the pin 3-3 is The diaphragm blades 5 are inserted in the lateral grooves 5-1 so as to be slidable relative to each other. Boss 3-1
Is a torsion spring 3 for constantly urging the lever 3 in one direction (a direction of closing the diaphragm and a direction of the stop position of the diaphragm blades).
4 is fitted.

Long grooves 4-2, 4-3, 5-2, 5-3 are formed in the diaphragm blades 4 and 5 in parallel with their respective side edges, and the long grooves 4-2, 4-3, 5-2, 5-3 are provided so as to project from the main plate 1 in each of the grooves. A guide pin (not shown) is inserted so as to be slidable relative to each other.

The motor 2 is a permanent magnet rotor 2-1 having a shaft 2-2 which is inserted into the shaft hole 1-7 of the main plate 1 and fitted into the holes of the boss and 3-1 of the diaphragm blade drive lever 3 and the rotor 2-1. 2-
Coil bobbin mounting rod of the main plate 1 arranged outside 1
A pair of coil bobbins 2-4 attached to 3 and 1-4
And 2-5, the coil 2-6 wound around the coil bobbin 2-4,
A cylindrical yoke 2-12, which surrounds the coil 2-7 wound around the coil bobbin 2-5, the coil bobbins 2-4 and 2-5, and is seated on the yoke support seat 1-2 of the main plate 1 and the yoke 2-2. It is composed of various members such as a bearing plate 2-13, which is fitted to the other end surface of 12 and is fastened to the bobbin mounting rods 1-3 and 1-4 by two screws B3.

The bearing plate 2-13 has a bearing hole 2-13a for rotatably supporting the tip small diameter portion of one shaft 2-3 of the rotor 2-1, a hole 1-3a of the coil bobbin mounting rod 1-3, and a coil bobbin mounting rod 1. -4 hole 1-4a, and holes 2-13b and 2-13c for inserting two screws B3 screwed respectively are provided.

In the printed wiring board 7 arranged outside the bearing plate 2-13, two screws B2 are inserted 7-1 and 7-2, and 2
Holes 7-3 and 7-4 for inserting the screws B3 of the book,
Is pierced. The printed wiring board 7 is fastened on the two columns 1-5 and 1-6 of the base plate 1 by two screws B2 which are inserted into the holes 7-1 and 7-2, and the holes 7-3 and 7 Bearing plate 2-13 by two screws B3 inserted in -4
Is two coil bobbin mounting rods 1-3 and 1-4 of the main plate 1.
Fixed to.

The coil bobbin 2-4 has terminals 2-8 and 2-9 connected to both ends of the coil 2-6, and the coil bobbin 2-5 has terminals 2 connected to both ends of the coil 2-7.
-10 and 2-11 are protruding. These terminals are inserted into the terminal holes 7-5 to 7-8 formed in the printed wiring board 7 and soldered.

[Problems to be Solved by the Invention]

The conventional diaphragm device having the above structure has the following problems.

The cover 6 was fastened to the main plate 1 by the screws inserted in the holes 6-1a and 6-2a and 6-5, but the cover 6
Since it is thin, it is easy to bend or warp, so there was a risk of warping, bending, or kinking due to the difference in the tightening force at the tightening points of the three screws. If the cover 6 attached to the main plate is warped, twisted or bent, the diaphragm blades come into contact with the cover 6 and hinder the movement of the diaphragm blades. As a result, the operation of the diaphragm blades may become inaccurate, or the operating speed may significantly fluctuate, making it impossible to perform accurate exposure. Further, in the conventional cover mounting structure, the cover is screwed to the base plate using screws, so that the cover mounting man-hour, the cover mounting time and the cost are large and the cost reduction of the diaphragm device is hindered.

It is an object of the present invention to provide an improved diaphragm device which has better assembly accuracy and product yield than conventional diaphragm devices, can be manufactured at low cost, and does not interfere with the operation of diaphragm blades. .

[Means for solving the problem]

A diaphragm device of the present invention, a base plate having an optical path hole, a diaphragm blade supported by the base plate, for adjusting the amount of light passing through the optical path hole of the base plate and fixed to the base plate,
A motor for driving the diaphragm blades and a cover member attached to the base plate for protecting the diaphragm blades, wherein the base plate is provided with a locking portion for locking the cover member. In addition, the cover member is provided with a locked portion that is locked to the locking portion of the main plate, and the locked member is moved by moving the cover member in the moving direction of the diaphragm blade with respect to the main plate. The part moves from a non-locking position that is not locked to the main plate to a locking position that is locked to the main plate, and the cover member is attached to the main plate.

Therefore, in the diaphragm device of the present invention, there is less risk of warping, bending, kinking, etc. of the cover, that is, there is less risk of contact between the cover member and the diaphragm blades, and the cover member prevents movement of the diaphragm blades. , There is no fear of inaccurate operation of the diaphragm blades. Further, in the diaphragm device of the present invention, since the mounting structure of the cover member and the base plate is not the fastening structure with the screw, it can be manufactured at a lower cost than the conventional diaphragm device.

〔Example〕

An embodiment of the electric diaphragm device of the present invention will be described below with reference to FIGS. 1 to 4. Since the members shown in FIG. 1 with the same reference numerals as those in FIG. 5 are the same as the constituent members of the conventional apparatus shown in FIG. 5, the description of the same members will be omitted.

In FIG. 1, reference numeral 9 is a main plate, 10 is a cover attached to the main plate 9, 11 is a motor, and 11-10 is a printed wiring board on which electric wiring for the motor 11 is provided.

The base plate 9 has an optical path hole 9-1, a yoke support seat 9-2 for mounting the yoke of the motor 11, a yoke positioning piece 9-3 protruding from the upper surface of the yoke support seat 9-2, and a yoke support seat 9-2. Material 9-
2, a pair of low-profile snap-type locking projections 9-4 and 9-5 for fixing the coil bobbin, which are provided on the bottom plate surface inside, a motor shaft hole 9-6 for inserting the shaft of the motor 11, Positioning pin insertion hole for fixing coil bobbin and positioning 9-7
9-8, and 9-8, projections 9-9 and 9-10 as locking portions for locking the cover 10 by locking the groove on the side edge of the cover 10.
Etc. are formed. A protrusion for locking the groove on the side edge portion of the cover 10 is also provided on the other side edge portion of the base plate 9, but it is not shown in FIG.

At both side edges of the cover 10, a groove 10-1, which is a locked portion for locking the projection 9-9 of the main plate 9, and a projection 9- of the main plate 9,
A groove 10-2 which is a locked portion for locking 10 and a groove 10-2 which is a locked portion for locking two protrusions (not shown) on the other side edge of the main plate 9. 3 and 10-4 are formed. Further, at one end of the cover 10, the boss 9 of the protrusion 9-11 with the flange 9-11a formed on the end of the main plate 9 is formed.
A notch 10-5 for fitting the -11b is formed.

The grooves 10-1 to 10-4 are formed as two-step grooves as shown in FIG. 1, and the shallow groove portion 10 is formed as shown in FIG.
-1a and a deep groove 10-1b. (groove
Since all of 10-1 to 10-4 have the same structure, the groove 10-1
Only the following will be described. ) Before fixing the cover 10 to the main plate 9 (non-locking position),
The relative positional relationship between the groove 10-1 of the cover 10 and the protrusion 9-9 of the base plate 9 is as shown in FIG. That is, the protrusion 9
-9 is located in the deep groove portion 10-1b of the groove 10-1. When the cover 10 is slid in the direction of movement the right of the blade aperture at the second view when coupling the cover 10 to the base plate 9, projections 9-9 are strongly pressed against the end face of the groove portion 10-1b, the arrow f ₃ by a reaction force deflect outward as a result, the by the elastic restoring force of its own together with the projections 9-9 is moved to the shallow groove portion 10-1c as indicated by the chain line (acting inwardly opposite to the arrow f ₃₎ The bottom surface 10-1c of the groove 10-1a is strongly pressed. Therefore, the cover 10 is clamped by the four protrusions of the main plate 9, and is firmly fixed to the main plate 9.

On the other hand, when the cover 10 is slid rightward with respect to the main plate 9, the protrusion 9-11 of the main plate 9 is pushed into the notch 10-5 at the edge of the cover 10, and the protrusion 9-11 is cut out 10-5. Between the side walls of the. Also, the cover 10 has the protrusions 9-11.
It is restrained so as not to move in the plate thickness direction (thickness direction of the ground plate) by the flange 9-11a.

Here, returning to FIG. 1 again, the structure of the motor 11 will be described.

The motor 11 includes a rotor 11-1 made of a permanent magnet having shafts 11-2 and 11-3, a pair of coil bobbins 11-4 and 11-5, which surround the rotor 11-1, and are arranged to face each other, and a coil bobbin 11-. Coils 11-6 wound around 4 and 11-5 and
11-7, a coil 11 surrounding the coil bobbins 11-4 and 11-5 and fixed on the base plate 9 yoke support seat 9-2
-8, a bearing plate 11-9 fitted to one end of the yoke 11-8 and gripped by the locking claws of the coil bobbins 11-4 and 11-5 described later, together with the bearing plate 11-9 by the locking claws. The printed wiring board 11-10, which is gripped, is used.

One shaft 11-2 of the rotor 11-1 has a shaft hole 9-5 in the main plate 9.
And the boss 3 of the diaphragm blade drive lever 3
1 bearing. The other shaft 11-3 of the rotor 11-1
Is inserted into the bearing portion 11-9a of the bearing plate 11-9 and is rotatably supported.

On one end surface of the coil bobbins 11-4 and 11-5, locking claws 11-4a, 11-4b, 11-5a, 11- for locking the bearing plate 11-9 and the printed wiring board 11-10. Pins 11-4c, 11-4d, 11- for accurately positioning the bearing plate 11-9 with respect to the coil bobbins 11-4 and 11-5 are provided with 5b.
5c and 11-5d are projected. In addition, the coil bobbin 11-
Pins 11-4e and 11-4f (first portion) for positioning the coil bobbins 11-4 and 11-5 with respect to the main plate 9 are provided on the lower surfaces of 4 and 11-5 (that is, the surface facing the surface of the main plate 9). In the figure, the pin protruding from the lower surface of the coil bobbin 11-5 is not drawn, but the pin protruding from the lower surface of the coil bobbin 11-5 is also provided. 4e is inserted into the hole 9-7 of the main plate 9, and the pin 11-4f is inserted into the hole 9-8 of the main plate 9, respectively.

The bearing plate 11-9 includes a bearing portion 11-9a that rotatably supports the shaft 11-3 of the rotor 11-1, a locking claw 11-4a of the coil bobbin 11-4, and a locking claw 11 of the coil bobbin 11-5. Notch 11-9b into which -5a enters, Locking claw 11-4b of coil bobbin 11-4
And a notch 11-9c into which the locking claw 11-5b of the coil bobbin 11-5 is inserted, a hole 11-9g for inserting the coil terminal 11-6a protruding upward from the upper surface of the coil bobbin 11-4, and the coil bobbin 11-4. Terminal for coil 11-
Hole 11-9f for inserting 6b, hole 11-9i for inserting the coil terminal 11-7a protruding from the upper surface of the coil bobbin 11-5,
A hole 11-9h for inserting the coil terminal 11-7b protruding from the coil bobbin 11-5 is formed. The bearing plate 11-9 is configured to be fitted to the end portion of the yoke 11-8, and when the bearing plate 11-9 is fitted to the yoke 11-8, the coil bobbins 11-4 and 11-5. Each locking claw 11-
4a and 11-5a pass through the inside of the notch 11-9b of the bearing plate 11-9 and project above the bearing plate 11-9, and the locking claws 11-4b and 11-5b.
Projecting above the bearing plate 11-9 through the notch 11-9c.

On the lower end surface of the yoke 11-8, the yoke support seat 9 of the main plate 9 is provided.
-2 is formed with a notch 11-8a into which the protruding piece 9-3 protrudingly provided is fitted.

Printed wiring board 11- arranged outside bearing plate 11-9
Reference numeral 10 denotes a notch 11-10a for inserting the locking claws 11-4a and 11-5a, a notch 11-10b for inserting the locking claws 11-4b and 11-5b, and a bearing plate 11. -9 bearing part 11-9a
Hole 11-10c into which is inserted, coil bobbins 11-4 and 11-5
11-11d through which the pins 11-4c and 11-5c are inserted, and the elongated holes 11-10e through which the pins 11-4d and 11-5d of the coil bobbins 11-4 and 11-5 are inserted.

Coil bobbin 11-4 coil terminals 11-6a and 11-6b
Is inserted into the holes 11-10f and 11-10g of the printed wiring board 11-10 and soldered to the printed wiring board 11-10. The two coil terminals 11-7a and 11-7b of the coil bobbin 11-4 are The printed wiring board 11-10 is inserted into the holes 11-10h and 11-10i and soldered.

Next, the work of assembling the motor 11 to the main plate 9 will be described.

First, the rotor 11-1 is connected to the two coil bobbins 11-4 and
The coil bobbins 11-4 and 11-5 are positioned in the recesses of the respective facing surfaces of 11-5, and the coil bobbins 11-4 and 11-5 are pressed against each other. The rotor / stator unit is made by fitting from below. Next, the center of the rotor / stator unit (that is, the rotor shaft 11-
2) is vertically pushed down into the support seat 9-2 while aligning 2) with the shaft hole 9-6 in the yoke support seat 9-2 of the main plate 9, the tip of the shaft 11-1 will have a hole 9-. 6 and the yoke 11-8 rides on the support seat 9-2. At this time, the locking protrusions 9-4 and 9-5 of the main plate 9 are not attached to the coil bobbin.
Overhangs 11-4i at the lower edge of 11-4 and 11-5 and
11-4j (see FIG. 3) is hit, but when the unit is strongly pushed down, the locking projections 9-4 and 9-5 are pushed outward by the coil bobbin 11-4 overhanging portions 11-4i and 11-4j. Since the protrusions 9-4 and 9-5 elastically bend outward, the lower ends of the coil bobbins 11-4 and 11-5 descend to the bottom plate surface inside the yoke support seat 9-2, and the coil bobbin 11
-4 lower surface pins 11-4e and 11-4f are holes 9-7 in the main plate 9.
And 9-8, respectively, and the coil bobbin 11
-4 protrusions 11-4i and 11-4j move below the bent portions of the upper ends of the locking projections 9-4 and 9-5, so that the locking projections 9-4 and 9-5 have their own elasticity. The protrusions 9-4 and 9-5 return to their original positions by the restoring force, and the bent portions of the respective tips of the protrusions 9-4 and 9-5 enter into the concave portions 11-4g and 11-4h of the coil bobbin 11-4, and as a result, as shown in FIG. The coil bobbins 11-4 and 11-5 are fixed on the main plate 9 by the locking projections 9-4 and 9-5 as shown in FIG.

After fixing the coil bobbins 11-4 and 11-5 to the base plate 9 as described above, the cutouts 11-9b and 11-9b of the bearing plate 11-9 and
The printed wiring board 11-10 has cutouts 11-10a and 11-9c.
When the printed wiring board 11-10 and the bearing plate 11-9 are aligned with each other while being aligned with each other, the bearing portion 11-9a of the bearing plate 11-9 becomes a hole in the printed wiring board 11-10.
The bearing plate 11-9 and the printed wiring board 11-10 are integrated because they are fitted in the 11-10c. Next, the bearing plate 11-9 and the printed wiring 11- are integrated and lowered onto the coil bobbins 11-4 and 11-5. In this case, the coil bobbin 11
-4 and 11-5 locking pawls 11-4a and 11-5a are bearing plates 11-
9 notch 11-9b and printed wiring board 11-10 notch 11-
10a, and the locking pawls 11-4b and 11-5b are engaged with the bearing plate 11
-9 cutout 11-9c and printed wiring board 11-10 cutout 11
The bearing plate and the printed wiring board must be lowered while being positioned with respect to the coil bobbins 11-4 and 11-5 so as to enter the -10b.

The positions of the inner peripheral edges of the notches 11-10a and 11-10b are designed to be outside the positions of the tips of the locking claws 11-4a, 11-4b, 11-5a, 11-5b. Therefore, when the bearing plate and the printed wiring board are lowered onto the coil bobbins 11-4 and 11-5, the locking claws 11-4a, 11-5a, 11-4b, 11
Each notch of bearing plate 11-9 at each tip of −5b 11−9b and 11−
The inner peripheral edge of 9c hits, but when the bearing plate 11-9 and the printed wiring board 11-10 are pushed down by applying a large force, the locking claw 11-
4a, 11-5a, 11-4b, 11-5b elastically bend outward,
Since the tips of the locking pawls 11-4a, 11-5a, 11-4b, 11-5b escape to the outside, the bearing plate 11-9 causes the coil bobbins 11-4 and 11-.
5, the locking claws 11-4a, 11-5a, 11-4b, 11-5b return to their original state by their elastic restoring force, and the bent end of each locking claw is printed wiring board. The printed wiring board 11-10 and the bearing plate 11-9 are engaged with the upper surface of the 11-10 to form the coil bobbin 11-.
4 and 11-5. The printed wiring board 11-10 may be assembled on the bearing plate 11-9 after the bearing plate 11-9 is placed on the coil bobbins 11-4 and 11-5. Bearing plate 11-9 to coil bobbins 11-4 and 11-
5 When assembled on top of the coil bobbin 11-4 pin 11-
The bearing plate 11-9 is positioned with respect to the coil bobbin so that the holes 11-9e and 11-9d of the bearing plate 11-9 are aligned with 4c and 11-4d.

After the motor 11 is assembled to the base plate 9 as described above, the diaphragm blade drive lever 3 is attached to the shaft 11-2 of the motor 11, and the diaphragm blades 4 and 5 are further attached to the lever 3.

Then, as described above, the cover 10 is slid with respect to the main plate 9 in the moving direction of the diaphragm blades to cause the main plate 9 to move.
The cover 10 is attached to the above, and the assembly of the electric diaphragm device of the present invention is completed thereby.

〔The invention's effect〕

As described above, the diaphragm device of the present invention includes a base plate having an optical path hole, a diaphragm blade supported by the base plate, which adjusts the amount of light that moves with respect to the base plate and passes through the optical path hole of the base plate, A locking unit for fixing the cover member to the base plate, the motor being for driving the diaphragm blade, and having a cover member attached to the base plate for protecting the diaphragm blade. And a locked portion that is locked to the locking portion of the base plate is provided on the cover member, and the cover member is moved in the moving direction of the diaphragm blade with respect to the base plate. Then, the locked portion moves from the non-locking position where it is not locked to the main plate to the locking position where it is locked to the main plate, and the cover member is attached to the main plate. If you move the member relative to the main plate to lock it, Even if the cover member comes into contact with the diaphragm blade and an improper force is transmitted to the diaphragm blade, since the moving direction of the cover member is the same as the moving direction of the diaphragm blade, the diaphragm blade should move. Therefore, it is possible to release an illegal force applied to the diaphragm blade. As a result, it is possible to obtain a unique effect that it is difficult for the diaphragm blades to be damaged when the cover member and the base plate are coupled to each other, and for the diaphragm blades to be removed from a predetermined position.

Further, as compared with the conventional connection by a screw, the plane accuracy after assembling the cover member can be favorably maintained, so that when the cover member is locked to the main plate, the cover member warps, There is little risk of deformation such as bending or kinking, and the risk of unauthorized contact between the diaphragm blade and the cover member due to deformation of the cover member can be reduced.

Therefore, the assembling accuracy of the diaphragm device is improved, and the yield at the time of assembly is also improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part of an improved electric throttle device according to the present invention, and FIGS. 2 (a) and 2 (b) are for explaining a connecting structure of a cover and a main plate in the device shown in FIG. Is a partial plan view and a side view, FIG. 3 is a longitudinal sectional view of a motor portion and diaphragm blade driving portion of the electric diaphragm device shown in FIG. 1, and FIG. 4 is an end surface of the motor of the electric diaphragm device shown in FIG. FIG. 5 is a half-exposure view seen from the side, and FIG. 5 is an exploded perspective view of a conventional electric diaphragm device. 1,9 …… Base plate, 2,11 …… Motor 3 …… Aperture blade drive lever 4,5 …… Aperture blade, T …… Temporary fastening tape 9-4,9-5 …… Locking projection 11-1… ... Rotor 11-4, 11-5 ... Coil bobbin 11-6, 11-7 ... Coil 11-8 ... Yoke 11-4c, 11-4d, 11-4e, 11-4f ... Pin 11-4a, 11-4b, 11-5a, 11-5b …… Locking claw 11-9 …… Bearing plate 11-10 …… Printed wiring board

Claims (1)

(57) [Claims] 1. A base plate having an optical path hole, diaphragm blades supported by the base plate, for adjusting the amount of light passing through the optical path hole of the base plate, and fixed to the base plate. A motor for driving the blades, and a cover member attached to the base plate for protecting the diaphragm blades, wherein the base plate is provided with a locking portion for locking the cover member, The cover member is provided with a locked portion that is locked to the locking portion of the base plate, and the locked portion is moved by moving the cover member in the moving direction of the diaphragm blade with respect to the base plate. A diaphragm device, wherein the cover member is attached to the main plate by moving from a non-locking position that is not locked to the main plate to a locking position that is locked to the main plate.