JPH0590456U - Optical path open / close blade drive device - Google Patents

Abstract

(57) [Abstract] [Purpose] There is a degree of freedom in selecting the terminal pins that connect the coil ends, and even after the internal main components have been incorporated into the magnetic circuit components, the printed circuit board can be mounted and the magnetic sensor can be incorporated. (EN) An optical path opening / closing blade drive device which does not move in the coil body during winding and is not broken during winding, has a small number of assembly steps, and is easy to automate. [Constitution] Terminal pins 29a, 29b, 29c, 29d for fixing the ends of the drive coil and the braking coil are provided at an intermediate position between the drive coil and the braking coil.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical path opening / closing blade drive device for opening / closing driving an optical path opening / closing blade such as a diaphragm blade of a camera.

[0002]

[Prior Art]

 Conventionally, a diaphragm device of a video camera drives a plurality of optical path opening / closing blades by an optical path opening / closing blade driving device K shown in FIGS.

FIG. 12 is a perspective view showing a main part taken out from the magnetic circuit member and exploded, and FIG. 13 shows a part where the main part is assembled and then inserted into a hollow cylindrical magnetic circuit member. ..

This device K comprises a permanent magnet body 1 formed integrally with a drive shaft 2 and a pair of coil frames 4a, 4b having pockets h1, h2 for accommodating the permanent magnet body 1 therein. Is provided, and washers 3a, 3b for supporting both ends of the drive shaft 2 are added.

Each coil frame 4a, 4b has coil bodies e1, e2 around which a coil for guiding a signal current from a video camera is wound, but the coil itself is not shown.

Further, at least one of the coil frames 4a and 4b has a housing portion c for the magnetic sensor 8 as shown in the drawing, and further on the side away from the mutual face of the coil frames 4a and 4b. , And has terminal pins 5a, 5b, 6a, 6b for fixing the wire ends of the respective coils in a direction parallel to the axis.

Then, the permanent magnet body 1 is housed inside, the coil frames 4a and 4b are united, the terminal pins 5a, 5b, 6a and 6b arranged at approximately square positions are inserted, and the magnetic sensor 8 is inserted. A printed board 9 carrying the above is assembled as shown in FIG. 13, and this is inserted into a hollow cylindrical magnetic circuit member 7.

[0008]

[Problems to be solved by the device]

 In the conventional optical path opening / closing blade driving device K as described above, since the terminal pins 5a and 5b are attached to the coil frame 4a and the terminals 6a and 6b are attached to the coil frame 4b, the terminal pins 5a, 5b and 6a are attached. , 6b is naturally limited in the arrangement and polarity, and there is a problem that the degree of freedom is small.

Moreover, as shown in the figure, since it is provided at a position close to the magnetic circuit member 7 and away from the phase surface, each terminal pin has to be arranged at a distance close to each other, and as shown in FIG. The width L2 of the constriction of the printed board 9 carrying the magnetic sensor 8 must be smaller than the width L1 of the sensor carrying part, and the printed board 9 is mounted after the main part is assembled in the magnetic circuit member 7. Even when trying to insert the sensor-carrying part inside, the constricted part cannot be passed through, and the printed board 9 is passed through each terminal pin as shown in FIG. 13, and the magnetic sensor 8 part is shown. Thus, it has to be bent and pulled into the magnetic circuit member 7, which is troublesome and hinders assembly automation.

Further, as shown in FIG. 12, when the drive shaft 2 is divided into two parts at the center of the axis, the drive shaft shaft holes d1 and d2 of the coil frames 4a and 4b are hard to be completely cylindrical. For this reason, parts such as bearing washers 3a and 3b as shown in the figure were required.

Further, since the outer circumferences of the coil body portions e1 and e2 facing the magnetic circuit member are inevitably cylindrical surfaces, they are easily slipped during coil winding and are easily cut at the end face and the edge s 2. There was a problem.

This invention was made in view of the above problems in the conventional optical path opening / closing blade driving device, and there is a degree of freedom in selecting the terminal pin for connecting the coil end, and the internal main member is used for the magnetic circuit member. Even after assembly, the printed circuit board can be mounted and the magnetic sensor can be installed, the coil does not move in the coil body during coil winding, and the coil does not break during winding, reducing the number of assembly steps and facilitating automation. The objective is to obtain a simple optical path opening / closing blade drive device.

[0013]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a drive shaft for transmitting a rotational force to the optical path opening / closing blade of a camera, a permanent magnet body attached to the drive shaft, and the permanent magnet body are rotatably housed. A coil frame that projects one end of the drive shaft from the end face, a drive coil that is wound around this coil frame in the axial direction of the drive shaft, and generates a rotational force in the permanent magnet body, and the coil frame in the axial direction of the drive shaft. An optical path that includes a damping coil that is wound around a coil to brake the rotation of the permanent magnet body, a hollow magnetic circuit member with a coil frame inserted inside, and a magnetic sensor that detects the rotational angle position of the permanent magnet body. In the opening / closing blade drive device, a terminal pin for fixing the ends of the driving coil and the braking coil is provided at an intermediate position between the driving coil and the braking coil.

[0014]

【Example】

 Next, various embodiments of the present invention will be described with reference to the drawings.

<First Embodiment> FIG. 1 is an exploded perspective view of an optical path opening / closing blade driving device according to a first embodiment of the present invention applied to a diaphragm device of a video camera. 3 is a side view including a partial cross section of the diaphragm device E, FIG. 4 is a front view of the same, and FIG. 5 is a rear view of the same diaphragm device E without a holding plate.

The diaphragm device is indicated by a general symbol E. The optical path opening / closing blade driving device constitutes the blade driving unit 10 in the diaphragm device E, and the optical path opening / closing blade driving device will be hereinafter referred to as the blade driving unit 10.

The diaphragm device E includes a blade driving unit 10 and a diaphragm unit 50 that is driven to open and close by the blade driving unit 10.

The diaphragm unit 50 covers the base plate 51 to which the blade drive unit 10 is attached, the open / close blades 80 and 85, and one surface of the base plate 51, and the open / close blades 80 and 85 are slidably sandwiched between the base plate 51 and the base plate 51. It is composed of a holding plate 70, an operating lever 90 that engages with the opening / closing blades 80 and 85 and transmits the driving force of the blade driving unit 10, and an urging spring 90 that always biases the operating lever 90 in one direction. There is.

The base plate 51 has an optical path opening 52, and as shown in the drawing, a number of engaging protrusions 55a, 55b, 56a, 56b for attachment are attached to the mounting portion 53 of the blade driving unit 10. Also, ribs 57a, 57b for fitting and the like are provided, and a small hole 54 for penetrating the drive shaft is formed.

Further, locking projections 58a and 58b for holding the printed wiring board are provided on the side surfaces. In addition, although the base plates 51a and 51b are shown in FIG. 1, they are merely the front and back of the same thing, and 51a is the front side and 51b is the back side (inner side). Therefore, in the case of simply the main plate, it is referred to as the main plate 51.

As shown in the rear view of the main plate 51, the main plate 51 has engaging protrusions 59 and 60 slidably engaged with the opening / closing blades 80 and 85, and ribs 61 and 62 for floating the opening / closing blades 80 and 85. Etc. are provided.

The actuating lever 90 is provided with a hole 91 into which the drive shaft of the blade drive unit 10 is fitted, and pin portions 92 a and 92 b that engage with the opening / closing blades 80 and 85.

As is well known, the opening / closing blade 80 is formed of a thin piece of black polyester or the like, and has a half-moon portion 81 for opening / closing the optical path, a small hole 82 for fitting with the pin portion 92a, and a length for engaging with the engaging projection 59. Holes 83 and the like are provided. The one opening / closing blade 85 also has a half-moon portion 86, a small hole 87, an elongated hole 88, and the like.

A filter 89 for adjusting the light amount when the aperture is small is attached to the deepest part of the half-moon 81 of the opening / closing blade 80.

An optical path opening 71 is also formed in the holding plate 70. Further, cocoon-shaped elongated holes 72, 73 and the like are formed so that the pin portions 92a, 92b of the operating lever 90 can be rotated. Incidentally, 74, 75 and the like are projections for coupling with the base plate 51.

Next, the configuration of the blade drive unit 10 will be described.

The blade drive unit 10 includes a permanent magnet body 11 that is rotatably supported at the center thereof, and a coil frame 14 that is a shaft side coil frame (shaft side bobbin) surrounding the permanent magnet body 11. The coil frame 25 which is the receiving side coil frame (receiving side bobbin), the drive coil 130A and the braking coil 130B wound around the coil frames 14 and 25 as shown in FIG. An iron hollow cylindrical magnetic circuit member (yoke) 35 fitted to the outer circumference to guide the magnetism of the permanent magnet body 11, an end plate 36 for pressing the end portion of the magnetic circuit member 35, and rotation of the permanent magnet body 11. A magnetic sensor 37 for detecting an angular position is carried, and is composed of the magnetic sensor 37 and a conductor printed board 38 of each coil 130A, 130B.

As shown in FIGS. 1 and 3, the permanent magnet body 11 is composed of a cylindrical magnet 12 and a drive shaft 13 fixed through the cylindrical center of the magnet 12.

The permanent magnet body 11 is rotatably supported inside the coil frame 14 and the coil frame 25.

The coil frame 14 is a shaft side coil frame that penetrates the penetrating side 13 a of the drive shaft 13 of the permanent magnet body 11, and the coil frame 25 is a receiving side coil frame that pivotally supports the non-penetrating side 13 b of the drive shaft 13. is there.

FIG. 2 shows a detailed perspective view of the coil frames 14 and 25.

The coil frame 14 has a cavity 15 for accommodating the magnet 12 inside, and a pair of engaging grooves 16 a, 16 b engaged with the coil frame 25 at the time of coupling with the coil frame 25. The engaging grooves 16a, 16b also engage with the engaging protrusions 55a, 55b of the base plate 51 of the narrowed portion 50 at the same time to contribute to the attachment to the base plate 51.

Further, a pair of sensor accommodating portions 17a 1 and 17b are provided at positions 90 degrees symmetrical to the engaging grooves 16a and 16b, and the engaging protrusion 56a of the main plate 51 is below the sensor accommodating portions 17a and 17b. , 56b, and a pair of engaging grooves 18a, 18b are provided for engaging and mounting.

Winding portions 19a and 19b for winding the drive coil 130A and the braking coil 130B are provided between the engagement grooves 16a and 16b and the sensor housing portions 17a and 17b.

As shown in FIG. 3, the winding portions 19a and 19b are provided with a plurality of slip stoppers 20 so that the coils 130A and 130B do not slip during winding.

A shaft hole 21 that axially supports the penetrating side 13 a of the drive shaft 13 penetrates through the bottom of the coil frame 14.

On the other hand, a pair of engaging protrusions 26 a and 26 b that engage with the engaging grooves 16 a and 16 b of the coil frame 14 are provided on the coil frame 25, which is the receiving side coil frame.

Further, sensor insertion notches 27a 1 and 27b 2 having the same width as the sensor accommodating portions 17a and 17b are provided.

Further, similar winding portions 28a and 28b are provided at the same phase portion as the winding portions 19a and 19b of the coil frame 14, and a slip stopper 20 is provided as shown in FIG. If there is no slip stopper 20 as shown in FIG. 7, when the coil is wound, the coil 130A slips outward on the R surface of the winding portions 28a and 28b at the first turn, for example, and the coil 130A breaks after being wound for several turns. A slip stopper 20 is provided as shown in FIG.

Terminal pins 29a, 29b, 29c, 29d for stopping the wire ends of the coils 130A, 130B are provided upright on the end faces of the intermediate portions of the winding parts 28a, 28b.

Since the constituent members of the blade drive unit 10 are as described above, in order to assemble them, first, the drive shaft 13 is press-fitted into the magnet 12 to form the permanent magnet body 11, and then the drive on the penetration side is performed. The shaft 13a is inserted into the shaft hole 21 of the coil frame 14, the non-penetrating side 13b is fitted into the shaft hole 25a of the coil frame 25, and the engaging protrusions 26a and 26b of the coil frame 25 are engaged with the engaging groove 16a of the coil frame 14. , 16b while assembling the coil frames 14 and 25 into an integral coil frame.

When the coil frame is assembled, the drive coil 130A is wound around one of the winding portions 19a, 19b, 28a, 28b, and the braking coil 130B is wound around the other.

When the coils 130A and 130B are wound, the wire ends of the coils 130A and 130B can be connected by selecting the most appropriate one of the terminal pins 29a, 29b, 29c and 29d. .. For example, as shown in FIG. 8, the start ends of both coils 130A and 130B are connected to the terminal pins 29a and 29d at both ends, and the ends are connected to the central 29b and 29c, or the coil 130A is connected to the terminal pins 29a and 29b. The coil 130B can be connected to the terminal pins 29c and 29d, the connection terminal pins can be selected freely, and the wiring formed on the conductor printed board 38 can be easily arranged and designed.

When the winding of the coils 130A and 130B is completed as described above, a tape (not shown) is wound to insulate the coils 130A and 130B from the magnetic circuit member 35.

Then, the engagement grooves 16a, 16b and the engagement grooves 18a, 18b on the coil frame 14 side are respectively coupled with the engagement protrusions 55a, 55b, 56a, 56b provided on the mounting portion 53 of the main plate 51, The coil frame product is attached to the main plate 51 side.

In the above state, the magnetic circuit member 35 is fitted and the end plate 36 is covered as shown in FIG.

After that, the printed wiring board 38 is mounted while passing the terminal pins 29a, 29b, 29c, 29d through the four small holes. At this time, the magnetic sensor 37 can be inserted into the sensor housing portion 17 of the coil frame 14 through the sensor insertion notch portion 27 of the coil frame 25. This is because the width dimension of the sensor insertion notch portion 27 and the width dimension of the sensor accommodating portion 17 are formed to be substantially the same, and they can be easily inserted even at the final stage of the assembly process.

Finally, the blade pins 10 are assembled by connecting the terminal pins 29a, 29b, 29c, 29d and the printed wiring board 38 with solder or the like.

A description of the assembly of the diaphragm unit 50 side is omitted.

Second Embodiment The optical path opening / closing blade driving device 100 of FIG. 9 is an example in which the terminal pins 101a, 101b, 101c, 101d are arranged in a staggered manner.

According to such a staggered arrangement, the distance between the terminal pins 101a, 101b, 101c, 101d becomes wider, and the work of winding the coil to the terminal pins 101a, 101b, 101c, 101d becomes easier.

<Third Embodiment> In the optical path opening / closing blade driving device 110 shown in FIGS. 10 and 11, the device 10 of the first embodiment is cut in two in a direction perpendicular to the axis, whereas in FIG. It is cut in two in the axial direction.

However, as shown in the drawing, the left and right coil frames 111 and 116 have the fitting target portions of the concave portion 112 and the convex portion 117, and the convex portion 113 and the concave portion 118, respectively, and the terminal pins are as shown in FIG. Although they have 114a, 114b and 119b, 119c, respectively, when assembled, these terminal pins 114a, 114b, 119b, 119c are arranged in the intermediate portion between the winding parts 115 and 120. Moreover, the bearing of the drive shaft 13 is shared by both coil frames 111 and 116, and unlike the conventional vertical split type coil frame bearing part that requires a washer in a combined form, the number of parts is reduced. be able to.

[0054]

[Effect of the device]

 In this invention, a drive shaft that transmits a rotational force to an optical path opening / closing blade of a camera, a permanent magnet body attached to the drive shaft, and the permanent magnet body are rotatably accommodated, and one end surface of the drive shaft is connected to one end of the drive shaft. A coil frame to be projected, a drive coil wound around the coil frame in the axial direction of the drive shaft to generate a rotational force in the permanent magnet body, and a coil frame wound around the coil frame in the axial direction of the drive shaft to An optical path opening / closing blade drive device including a braking coil for braking rotation, a hollow magnetic circuit member having a coil frame inserted therein, and a magnetic sensor for detecting a rotation angle position of a permanent magnet body. Since the terminal pin for fixing the end of the braking coil is provided at the intermediate position between the drive coil and the braking coil, each coil end can be connected to any terminal pin, and the terminal for fixing the end of the coil can be connected. Free pins Can-option. Further, a sensor housing portion for housing the magnetic sensor is provided on the circumferential surface of the coil frame that is in contact with the magnetic circuit member, and a guide that opens from the sensor housing portion to at least one end surface of the coil frame and has a width of at least the sensor housing portion Since the groove is provided, it is possible to insert the magnetic sensor into the sensor housing portion from the outside after inserting and assembling the coil frame inside the magnetic circuit member. In addition, since the windings of the drive coil and braking coil of the coil frame are provided with anti-slip for each coil wire, the coil wire does not move in the coil body during coil winding, and during coil winding Do not disconnect.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a diaphragm device of a video camera to which an optical path opening / closing blade driving device is applied.

FIG. 2 is an exploded perspective view of a coil frame. (First embodiment)

FIG. 3 is a side view of a diaphragm device.

FIG. 4 is a plan view of the diaphragm device.

FIG. 5 is a rear view of the diaphragm device with the pressing plate removed.

FIG. 6 is a perspective view showing a state where a coil frame and a printed wiring board are inserted into a magnetic circuit member.

FIG. 7 is an explanatory diagram showing a problem when a coil is wound around a coil frame.

FIG. 8 is a diagram for explaining the effect of the slip prevention provided on the coil frame.

FIG. 9 is a configuration diagram of a main part of a coil frame of a device according to a second embodiment.

FIG. 10 is a structural explanatory view of a coil frame of the device of the third embodiment.

FIG. 11 is an exploded perspective view of the main part of the apparatus of the third embodiment.

FIG. 12 is an exploded perspective view of a main part of a conventional optical path opening / closing blade driving device.

FIG. 13 is likewise an assembly procedure diagram.

[Explanation of symbols]

E Camera diaphragm device 10 Blade drive unit (optical path opening / closing blade drive device) (first embodiment) 11 Permanent magnet body 13 Drive shaft 14 Coil frame (axis side coil frame) 17 Sensor housing unit 19 Winding unit 20 Non-slip 25 coil frame (reception side coil frame) 27 sensor insertion notch 28 winding part 29a-29d terminal pin 35 magnetic circuit member 37 magnetic sensor 38 conductor printed board 80 open / close blade 85 open / close blade 100 blade drive unit (optical path open / close blade drive device) ) (Second embodiment) 110 Blade driving unit (optical path opening / closing blade driving device) (Third embodiment)

Claims (7)

[Scope of utility model registration request] 1. A drive shaft for transmitting a rotational force to an optical path opening / closing blade of a camera, and a permanent magnet body attached to the drive shaft,
A coil frame that rotatably accommodates the permanent magnet body and projects one end of the drive shaft from one end surface of the permanent magnet body; A drive coil to be generated, a braking coil wound around the coil frame in the axial direction of the drive shaft to brake the rotation of the permanent magnet body, and a hollow magnetic circuit member having the coil frame inserted therein. An optical path opening / closing blade drive device including a magnetic sensor for detecting a rotation angle position of the permanent magnet body, wherein a terminal pin for fixing an end portion of the drive coil and the braking coil is connected to the drive coil and the braking coil. An optical path opening / closing blade drive device, which is provided at an intermediate position with respect to a coil. 2. The optical path opening / closing blade according to claim 1, wherein the coil frame is divided into a shaft side coil frame on a side where the drive shaft projects and a receiving side coil frame on a side where the drive shaft does not project. Drive. 3. The optical path opening / closing blade drive device according to claim 1, wherein the coil frame is divided into two parts on a plane parallel to the axis of the drive shaft. 4. The optical path according to claim 1, 2 or 3, wherein the winding portions of the drive coil and the braking coil of the coil frame are provided with slip stoppers for the respective coils. Opening and closing blade drive device. 5. A sensor housing portion for housing the magnetic sensor is provided on a peripheral surface of the coil frame which is in contact with the magnetic circuit member, and at least one end surface of the coil frame is opened from the sensor housing portion, and at least the sensor housing portion is opened. The guide groove having the width of the sensor housing portion is provided, and the magnetic sensor can be inserted into the sensor housing portion from the outside after the coil frame is inserted and assembled inside the magnetic circuit member. The optical path opening / closing blade drive device described. 6. A bearing hole for penetrating and supporting the drive shaft in one coil frame of the two divided coil frames, and a non-penetrating hole for supporting the other end of the drive shaft in the other coil frame. The optical path opening / closing blade drive device according to claim 3, wherein a bearing portion is provided. 7. The optical-path opening / closing blade drive device according to claim 1, wherein the terminal pin is provided on an end surface of the coil frame opposite to an end surface of the coil frame that projects the drive shaft.