JPH0622825Y2 - Light amount diaphragm device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a light amount diaphragm device.

[Prior art]

Conventionally, in this type of light amount diaphragm device, the motor and the base plate are fixed to each other by sandwiching the support 1a of the base plate 1 with a coil frame and inserting a yoke 5 into the support plate 1a of the base plate 1 as shown in FIG. It was fixed by tightening with 14. Reference numeral 6 in the drawing denotes a rotating shaft fixed to a rotor magnet (not shown) driven by a driving coil and a braking coil.

In the conventional motor bearing structure of this type, as shown in FIG. 7, the base plate 1 forms the upper bearing, and the motor portion fixing plate 13 forms the lower bearing.

Further, in the conventional type as shown in FIG. 8, pins 203 and 204 are planted on the base plate 1 of the motor, and the pins 205 on the drive arm 200 for driving the diaphragm blades fixed to the rotary shaft 6 are shown in the figure. The spring 201 exerts a biasing force in the right rotation direction (this is the direction in which the diaphragm is closed).

That is, the spring 201 is wound around the pin 204 so that one end is in contact with the pin 203 and the other end is in contact with the pin 205 to give the above-mentioned bias.

[Problems to be solved by the invention]

Therefore, the bearing structure is complicated and the number of parts is increased.

In addition, there is a drawback that the number of steps is increased because the motor and the motor base plate are fixed by using a screw or the like.

In addition to the motor base plate, a diaphragm base plate is required, and complicated parts for connecting the two are required.Usually, a boss is provided on the motor base plate side and the diaphragm base plate is connected via this boss. However, there is a drawback in that the thickness of the entire light amount diaphragm device increases by the amount of this boss.

Further, when an urging force is applied to the arm by the method as shown in FIG. 8, the vector direction of the urging force changes in accordance with the rotation phase of the arm, so that the balance with the rotating force due to the energization of the coil on the motor side is accurately obtained. Therefore, there is a drawback that the relationship between the energization amount and the rotation amount becomes non-linear. In addition, there are drawbacks in that the loss of force due to the spring is large, the number of parts is large, and space is required.

The present invention provides a light amount diaphragm device that can prevent fluctuation of torque due to the rotation phase of the spring as much as possible by making the winding portion of the spring for urging the diaphragm blades in a predetermined direction coaxial with the rotor shaft of the motor. The purpose is to provide.

〔Example〕

1 and 2 are schematic views of an embodiment of the present invention, in which 100 is a main plate which is in close contact with the motor part. Numerals 100a, 100b, 100c and 100d are hooks for engaging and holding the drive coil frame 3 of the motor part to prevent rotation, and 2 is a coil frame 3 of the motor part fixed via the main plate 100 to prevent slipping out. A wiring board for electrically connecting the terminals 3a and 3b of the coil 3d wound around the coil frame and the external wiring 200 together.
Denoted at 3c is a recess that engages with the hook 100a, and the recesses that engage with 100b to 100d are not shown. Reference numeral 4 is a braking coil frame, 4a and 4b are control coil terminals, 4d is a braking coil, 5 is a yoke, and 6 is an output rotary shaft sandwiched between the frames 3 and 4. Numerals 7 and 8 are aperture blades, which are changed by opening by being slid in the arrow X direction in the figure by the drive arm 11. 9 is a diaphragm protection plate. 10 is an arm 11
A return spring that urges the throttle toward the closing direction. The drive arm 11 is fixed to the shaft 6. Numeral 12 is a fixing screw for fixing the protective plate 9 to the main plate 100 via a spacer.

In the above configuration, the terminals 3a and 3b of the driving coil 3d, the terminals 4a and 4b of the braking coil 4d, and the five pins of the output rotary shaft 6 are inserted into the five holes 100e to 100i of the main plate 100, and the four hooks of the main plate 100 are inserted. 100a to 100d, 3c of coil frames 3 and 4 and other 3 not shown
The two hook engaging recesses are engaged to temporarily fix the coil frame and the main plate so that they do not rotate and come off. next,
To the four holes 2a to 2d of the wiring board 2, the terminals 3a, 3b, 4 of each coil
After inserting a and 4b respectively, fix them completely by soldering. By doing this, the coil frames 3, 4 of the motor section
Even if pulling force acts on the hook 100a to 100d of the main plate 100
And a total of 8 terminal pins soldered to the board 2
Since the force is divided into two parts, sufficient strength can be obtained. Further, by adjusting the width of the recess 3c and the like, it is possible to prevent the rotation and the slip-off even by temporary attachment.

In addition, 100k is a boss planted in the main plate 100 and has a flange at the tip, and a spring 10 is provided between the flange and the main plate.
Is wound. In addition, the shaft 6 is inserted into the hole 100i of the boss, and the arm 11 is fixed to the pin 11a of the arm 11.
11b are inserted into the long holes 7a and 8a of the diaphragm blades 7 and 8, respectively. One end of the spring 10 contacts the pin 11a,
The other end of the pin hits the pin 100j planted in the main plate 100,
A biasing force is applied to the arm 11 in the left rotation direction in the figure. The direction of this biasing force is the direction in which the diaphragm blades 7, 8 close the diaphragm.

With such a configuration, the vector direction of the biasing force of the spring 10 is always constant regardless of the rotation phase of the arm 11, and the relationship between the amount of current flowing through the coils 3d and 4d and the amount of rotation of the arm is accurate. To be able to control.

In addition, the torcross of the spring is reduced, the number of parts is reduced, and the space is also reduced.

Next, FIGS. 3 (a), (b), and FIG. 4 are embodiments of the bearing of the present invention, 3 is a drive coil frame, 3e is an upper bearing portion, 3f is a lower bearing portion, and 3g to 3i are Concave or convex for positioning with the braking coil frame. Reference numeral 4 is a braking coil frame, and 4 is a magnet fixed to the rotary shaft 6, which is housed in a recess 3k provided in the drive coil frame 3 and does not touch the coil frame.

The coil frame 4 also has the same structure as the coil frame 3.
In the above structure, the magnet 15 and the rotary shaft 6 fixed thereto are placed on the drive coil frame 3, and the positioning projections or recesses 3g to 3i of the coil frame 3 are positioned to correspond to the braking coil frame 4, respectively. Put it in the convex part and bring the two coil frames into close contact. In this state, a bearing for the shaft 6 is formed as shown in FIG. Since the coil frames are fixed to each other by taping and the coil frames 3 and 4 are pressed by the yoke 5, expansion or deformation of the bearing can be completely prevented. Moreover, the number of parts is greatly reduced because the bearing is formed by the coil frame.

Next, FIG. 5 is a diagram showing an example of the configuration of the diaphragm blades 7, 8, the protective plate 9, the base plate 100, etc. As shown in the drawing, the blade 8, the blade 7, and the protective plate 9 are arranged in this order on the base plate 100.

In addition, the pin 11a of the arm 11 is provided with an elongated hole 100a in the main plate through the elongated hole 7a.
In u, the pin 11b of the arm 11 is inserted into the long hole 100t through the long hole 8a.

Further, 100, 100m, 100p, 100q are sliding rails for receiving the blades 8, 100n, 100s, 100r are sliding rails for receiving the blades 7, and the heights of 100n, 100s, 100r are 100, 100m, 100p, 100r.
The height of the blade 8 is higher than the height of q.

Since the rails are installed in this way, the blades 7, 8
Further, the contact area with the base plate 100 is reduced, and the movement of the blade is stable.

Next, FIG. 6 is a diagram showing an example of the structure of the arm 11. The arm 11 is formed by molding, and the pins 11a and 11b have ring-shaped protrusions H and I as shown in FIG. 6 (b). is doing.

Therefore, the contact between the blades 7 and 8 and the arm 11 is also stabilized.

This is because when the arm 11 is molded by molding, the base of the pin is inclined unless this convex ring is provided and the elongated hole 7
The mating with a and 8a becomes unstable, and the pins 1a and
If a ring-shaped recess is formed around 11b, burrs are generated at the edge of the recess and the fitting with the slots 7a and 8a becomes unstable. According to him, such a problem disappears.

〔effect〕

According to the present invention, the winding portion of the torsion spring-shaped spring for urging the diaphragm blade in a predetermined direction is coaxial with the rotor shaft of the motor, and both ends of the spring drive the main plate and the motor. By engaging each of the arms for transmitting the force to the diaphragm blade, it is possible to prevent the fluctuation of the torque due to the rotation phase of the spring as much as possible.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a slide type light amount diaphragm device using the present invention. FIG. 2 is a partial sectional front view of the main plate and the coil frame. 3 (a) and 3 (b) are diagrams of the coil frame and the rotor magnet, and FIG. 4 is a state diagram in which the coil frame is closely attached. FIG. 5 is a diagram showing a configuration example of the blades and the base plate, and FIGS. 6 (a) and 6 (b) are diagrams showing the shape of the arm 11 around the pins. FIG. 7 is a partial cross-sectional exploded perspective view of a motor according to a conventional motor fixing method to a motor ground plate, and FIG. 8 is a view showing another example of the conventional motor. 100 is a base plate, 2 is a wiring board, 3 is a drive coil frame, 4 is a braking coil frame, 5 is a yoke, 6 is an output rotary shaft, 7 and 8 are diaphragm blades, 9 is a diaphragm protection plate, 10 is a return spring, 11 Is a drive arm, and 12 is a protective plate fixing screw.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References: Open 55-125626 (JP, U) Open 59-4523 (JP, U) Open 59-4524 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A light quantity diaphragm device for adjusting a light quantity by sliding diaphragm blades arranged on one surface of a main board along one surface of the main board, wherein a stator having a coil portion is attached to the other surface of the main board. The rotor shaft tip end side and the coil terminal tip end side are attached to one side of the main plate, and the rotor shaft is attached to the tip end side of the rotor shaft, and the rotational force of the rotor shaft is transmitted to the diaphragm blades. An arm for slidingly driving, a torsion spring-like spring for urging the arm in a predetermined direction, and a wiring board arranged on one surface of the base plate and connected with a tip end side of the coil are connected to the spring. Of the coil is disposed coaxially with the rotor shaft, and both free end sides of the spring are engaged with the base plate and the arm, respectively, and the terminals of the coil and the wiring board are Aperture diaphragm and wherein the fixed and the base plate and the motor by a soldered.