JPH07241064A - Driver - Google Patents

Abstract

PURPOSE:To eliminate irregularities from the side face of a lens barrel, for example, to be fixed with a driver by making an opening for passing a coil terminal through the end face of a stator case on one end side, i.e., the non- output side, of the rotary shaft of a rotor and forming a rib of predetermined height at the edge of the opening. CONSTITUTION:In order to locate the terminals 13h, 14h of a coil on the opposite side to the output shaft, openings 16a, 16b for projecting the terminals 13h, 14h are made through the end face of a stator 16. Ribs 21, 22, 23 higher than the coil entangled in the terminals 13h, 14h and partially serves as a guide mechanism for preventing positional shift of a thrust spring 17 are provided at the edge of the opening 16a, 16b. This structure prevents the coil terminal from shaking or being removed due to the heat when the coil is soldered to a board. Consequently, irregularities are removed from the side face of a lens barrel, for example, to which a motor is fixed and the size can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device such as a stepping motor attached to a video camera or a motor for a light quantity adjusting device.

[0002]

2. Description of the Related Art Conventionally, as a stepping motor for driving a photographing lens of a single-lens reflex camera, a video camera, etc.,
A stepping motor having a structure as shown in FIG. 5 is used. In FIG. 5, reference numeral 51a indicates a cylindrical rotor magnet, and the rotor magnet 51a is magnetized with a large number of poles on its outer peripheral surface. A lead screw 51b is fixed to the rotor magnet 51a with an adhesive or the like to form the output shaft 51. Reference numeral 53
Reference numerals 54 and 53 denote stator units arranged so as to surround the outer peripheral portion of the rotor magnet 51a.
Reference numeral 4b denotes a coil wound around the bobbins 53f and 54f in a ring shape to generate magnetic poles at the stators 53a, 53c, 54a and 54c. Reference numerals 56a and 56b denote stator cases made of metal, and 52 denotes two bearings 5
5 shows a sheet metal member having 55a, 55b, 57 is an output shaft 51
Shows a spring for urging the shaft in the axial direction.

The stepping motor shown in FIG. 5 is a two-phase type PM type stepping motor. Then, assuming that the phase on the bearing 55a side is the A phase and the phase on the biasing spring 57 side is the B phase, the A phase is the bobbin 5 around the upper stator 53a, the lower stator 53c, the coil 53b, and the coil 53b.
3f, stator case 56a. Further, each of the upper and lower stators 53a and 53c is formed with a plurality of comb teeth, and these comb teeth are arranged so that the respective comb teeth are engaged with each other with the coil 53b interposed therebetween. The same parts (54a, 54a,
54b, 54c, 54f, 56b), and the respective parts are similarly arranged.

Next, the positions of the A-phase and the B-phase are arranged so that the comb teeth of each of them are in a predetermined phase. Therefore, notches are formed in the stator cases 56a and 56b. By fitting the protrusions provided on the lower stator 53c and the upper stator 54a into the corresponding notches, a predetermined phase relationship is maintained. Further, a plate 55c made of a non-magnetic member is interposed between the stator cases 56a and 56b so that magnetic paths of respective phases do not influence each other.

In FIG. 7, such a motor is installed in a video lens of a video camera, and a motor 73, 72 drives a lens 73 for zooming and a lens 74 for focusing for focusing and zooming. Reference numeral 70 is a light quantity adjusting device, and 75, 76 and 77 are fixed lens barrels, and guide bars 78a and 7 provided between the fixed lens barrels 75 and 77.
The lens 73 is movably supported and guided in the optical axis direction by 8b, and the lens 74 is movably supported in the optical axis direction by guide bars 78c and 78d provided between the fixed lens barrels 76 and 77. That is, the fixed lens barrel 76 receives the four guide bars 78a, 78b, 78c, 78d. 7
Reference numerals 9a and 80a denote nut members having a half-threaded female thread portion with which the lead screws 71a and 72a of the motors 71 and 72 are screwed. The nut members 9a and 80a are inserted into the guide bars 78b and 78d and engage with the lenses 73 and 74. It is configured so that it can move integrally and is constantly pressed by the lead screws 71a and 72a by the spring members 79b and 80b.

[0006]

In the stepping motor constructed as described above, the stepping motors shown in FIGS.
As shown in, each terminal 5 of the coils 53b and 54b
3h and 54h are motors 71, as shown in FIG.
It was provided on the outer peripheral surface of the main body of 72. For this reason, when this motor is attached to the lens barrel of the video lens, there is a drawback in that the outer shape of the motor when assembled is increased by the protruding portion of the terminal.

In addition, in order to reduce the outer shape, the terminal 53
When the heights of h and 54h are lowered, not only the workability in soldering a flexible printed circuit board or the like to a motor is deteriorated, but also the solder heat during the soldering work is applied to the terminals 53h and 5h.
There is a risk that the motor is transmitted to the embedded seats 53i, 54i of 4 h, wobbles and comes off of the terminals, and the reliability of the motor itself is deteriorated due to disconnection of the coil due to these.

Further, the embedded seat 5 of the terminals 53h and 54h.
Since 3i and 54i are integrally provided in a part of the bobbins 53f and 54f described above, the area of the seat cannot be increased so much that they are sufficient as seats when soldering a flexible printed circuit board or the like. I couldn't say it was spacious.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a drive device for rotating a rotor magnet by a magnetic force generated by a stator around which a coil is wound by energizing a coil arranged in a housing means. An opening through which the terminal of the coil penetrates is formed on the end face of the housing means on the one end side which is the non-output side of the rotation shaft of the rotor, and a rib having a predetermined height is formed on the edge of the opening. It is characterized by

According to this structure, the terminal of the coil protected by the rib can be arranged not on the side of the housing means such as the outer case but on the rear end surface, and for example, stepping for moving the lens of the lens barrel can be performed. It can be used as a motor.

The ribs can be used not only for protecting the terminals but also for positioning and guiding the biasing means that comes into contact with the end face of the rotating shaft of the rotor and biases the other end.

As another structure of the drive device, the rotor magnet is rotated by the magnetic force generated in the stator around which the coil is wound by energizing the coil placed in the housing means, and is also placed in the housing means. In the drive device for detecting the position of the rotor magnet by the stored hall element, an opening through which the coil and the terminal of the hall element penetrate the end face of the housing means at the one end side which is the non-output side of the rotating shaft of the rotor. And a rib having a predetermined height is formed on the edge of the opening.

With this structure, the present invention can be applied to motors other than the stepping motors described above, and not only the energizing terminals for the coils of the motor but also the terminals of the Hall element can be arranged on the rear end surface of the motor, for example.

In each of the above-mentioned driving devices, the terminal of the coil is planted on the bobbin around which the coil is wound, and the height of the rib is made higher than the height of the coil entwined with the terminal. For example, during soldering work when mounting a flexible printed circuit board, etc., it is possible to prevent the terminals from wobbling and coming off due to heat, and further improve the strength of the drive device itself. Therefore, the workability can be improved.

Further, an engaging member for engaging and holding the flexible printed circuit board arranged on the outer end face is provided on the outer end face on the one end side of the accommodating means, and the engaging member is more than the engaging face of the engaging member. The ribs are formed high, so that the flexible printed circuit board is held without coming off.

When used for a light quantity adjusting device, the rib can also serve as a guide member for guiding the Hall element to the mounting position of the housing means.

[0017]

FIG. 1 shows a first embodiment of the present invention, and is an exploded perspective view of a stepping motor incorporated in the lens unit of the video camera shown in FIG. 7 and the like to drive a zoom lens and a focus lens.

In FIG. 1, 11a is a multi-pole magnetized rotor magnet, 11b is a lead screw, and the rotor magnet 11a and the lead screw 11b are fixed by an adhesive or the like in a predetermined positional relationship to form the output shaft 11. ing. Reference numerals 13 and 14 denote stators, and upper stators 13a and 14a and lower stators 13c and 1 that form one phase, respectively.
4c. The coils 13b and 14b are wound around bobbins 13f and 14f, respectively. And coil 1
3b and bobbin 13f, and coil 14b and bobbin 14f
And form coil units 13g and 14g, respectively.

Reference numeral 16 designates the above-mentioned coil unit 13g,
14g and upper and lower stators 13a, 14a, 13c, 14c
Is a substantially arc-shaped stator case for housing and. The stator case 16 has a bobbin 13f,
Terminals 1 that are fixedly supported by press-fitting or the like in 14f.
3h and 14h are the rear end surface of the stator case 16 (output shaft 1
Openings 16a, 16 for penetrating from the side opposite to 1)
b is provided. Reference numerals 15a and 15b denote bearings of the output shaft 11. The bearing 15a is fixedly supported in the stator case 16, and the bearing 15b is fixedly supported by, for example, a lens barrel to which the present motor is attached.

Reference numeral 12 indicates a lid of the motor main body.
2 is attached to the stator case 16. Reference numeral 17 denotes a thrust spring having a biasing force in the axial direction of the output shaft 11,
The thrust spring 17 constantly urges the output shaft 11 to remove the backlash.

FIG. 2 shows coil units 13g and 14g in the stator case 16 of the above stepping motor,
A state in which the thrust spring 17 is assembled and a flexible printed board 28 for energizing the coil is additionally written is shown.

In the figure, reference numerals 21, 22, and 23 are ribs provided on the stator case 16 and having a predetermined height. As shown in FIG. 3, the height of the rib is set higher than that of the coil wound around the terminals 13h and 14h. Note that, in FIG. 3, components other than the stator case 16 and the coil unit 13g or 14g are not shown for simplicity.

Further, as shown in FIG. 2, the thrust spring 17
The rib 23 sandwiching the pin serves as a guide mechanism for preventing the displacement of the thrust spring 17 and the like.

In this way, the terminals 13h and 14h of the coil are
Terminals 13h and 14h in order to install on the side opposite to the output shaft
At the end surface of the case 16 where the
ribs provided with a and 16b and higher than the coil entwined with the terminals 13h and 14h at the edges of the openings 16a and 16b, and a part of which serves as a guide mechanism for preventing displacement of the thrust spring and the like. By providing the 21 and 22 at a plurality of locations, it is possible to prevent the coil terminals from wobbling or coming off due to heat during soldering work when mounting the coils or the like on the flexible printed circuit board, and improve the strength of the motor itself. Further miniaturization is possible, which in turn eliminates the unevenness of the side surface of the lens barrel, etc., on which the motor can be attached, which allows for miniaturization, and the ribs serve as mounting seats for flexible printed circuit boards, improving workability. Leads to.

FIG. 4 shows a second embodiment of the present invention.

The driving device 40 of this embodiment is used as a driving means of a light quantity adjusting device such as a video camera.
This light amount adjusting device is configured such that the area of the aperture diameter is changed by, for example, two diaphragm blades so that the subject can always be photographed in an appropriate exposure state.
For the rotor magnet magnetized to the pole, the stator 43
The magnetic poles formed in the above are opposed to each other, the bobbin around which the coil is wound is inserted into the stator, and the magnetic flux of the rotor magnet is detected in the case 46 that accommodates the rotor magnet, the stator, etc. to detect the rotation angle of the rotor magnet. A Hall element for detection is attached. In the drive unit 40, the arm-shaped output shaft 41 provided at the shaft end of the rotary shaft integrated with the rotor magnet is fitted into the overlapping engagement holes of the two diaphragm blades, and the output shaft 41 is rotated about 180 degrees. When the rotor magnet which rotates within the range rotates clockwise, for example, the diaphragm blades are moved in the opening direction.

Terminals 44a and 44b of a coil body (not shown) and terminals 45a, 45b, 45c and 45d of a hall element body (not shown) for detecting the position of a magnet rotor (not shown) pass through the case 46. For opening 46A, 46B, 46C are provided on the side opposite to the output shaft 41, and ribs 46a, 46b, 46c of a predetermined height are provided at the edges of the openings 46A, 46B, 46C. There is.

The heights of the ribs 46a, 46b, 46c are all the same, but the conditions for the heights are the same as in the first embodiment of the present invention. As shown in FIG. 4B, the case 46 shown in FIG. 4B is higher than the case 46 and is provided with a hook-like member 46e for preventing the flexible printed circuit board 48 from coming off and coming off. This hook-shaped member 46e
Is higher than the contact surface with the flexible printed circuit board 48. As a result, the flexible printed circuit board 48
Deflection makes it difficult to come off. The heights of the ribs 46a, 46b, 46c, 46d are determined so as to satisfy the conditions described above. Further, as shown in FIG. 4 (c), the rib 46c has a function as a guide (guide) mechanism for inserting along the guide surface 46f in the figure at the time of attaching the hall element for detecting the rotational position of the magnet. There is.

As described above, in the second embodiment, since the terminals of the coil and the Hall element are provided on the side opposite to the output shaft, the case end surface through which the terminals are provided is provided with an opening through which the terminals are provided. Ribs 46a, 46b, 46c, 46d, which are higher than the coil bound to the terminal and higher than the contact surface with the flexible printed circuit board of the hook member 46e for preventing the flexible printed circuit board 48 from coming off, are provided at a plurality of positions on the edge of the opening. Thus, during soldering work when mounting the flexible printed circuit board, it is possible to prevent the terminals from wobbling, coming off, and destroying the elements due to heat, and the strength of the light quantity adjusting device is improved, which enables further miniaturization.
Furthermore, since the ribs serve as mounting seats for the flexible printed circuit board, workability is improved.

[0030]

As described above, according to the present invention, the coil terminals protected by the ribs can be arranged not on the side of the housing means such as the outer case but on the rear end face, for example. The unevenness can be eliminated from the side surface of the lens barrel to which it is attached, and the lens barrel can be used as a stepping motor for moving the lens, for example.

This rib can be used not only for protecting the terminal, but also as a positioning guide means for the biasing means that comes into contact with the end surface of the rotor rotation shaft and biases it toward the other end.

Further, as another configuration of the driving device, it can be used for a motor other than the above-mentioned stepping motor, and not only the energizing terminal to the coil of the motor but also the terminal of the hall element can be arranged on the rear end face of the motor, for example. It becomes possible, and it can be used as a driving means of a light quantity adjusting device such as a video camera.

The terminals of the coil are planted in a bobbin around which the coil is wound, and the height of the rib is made higher than the height of the coil entwined with the terminal, so that, for example, when mounting a flexible printed circuit board or the like. During soldering work, it is possible to prevent the terminals from wobbling and coming off due to heat, improving the reliability of the device and further increasing the strength of the drive device itself. Therefore, the workability can be improved.

Further, an engaging member for engaging and holding the flexible printed circuit board arranged on the outer end surface is provided on the outer end surface on the one end side of the accommodating means, and the engaging member is more than the engaging surface of the engaging member. By forming the ribs to be high, the flexible printed circuit board can be held without coming off.

Further, when used for a light quantity adjusting device,
The rib can also serve as a guide member for guiding the Hall element to the mounting position of the housing means.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing an end surface of the motor shown in FIG.

FIG. 3 is a cross-sectional view showing the relationship between the stator case and coils of FIG.

FIG. 4 shows a second embodiment, (a) is an exploded perspective view,
(B) is sectional drawing which shows the mounting state of a flexible printed circuit board, (c) is sectional drawing which shows the rib which also has the function which inserts a Hall element.

FIG. 5 is a sectional view showing a conventional stepping motor for driving a lens.

6 is a front and side view of FIG.

7 shows a lens barrel using the motor of FIG. 5 for driving a lens, (a) is an exploded perspective view, and (b) is a side view.

[Explanation of symbols]

11, 41 ... Output shaft 13g, 14g
... Coil units 13h, 14h, 44a, 44b ... Coil terminals 16 ... Stator case 17 ... Thrust springs 21, 22, 23 ... Ribs 28, 48 ... Flexible printed circuit board 46 ... Cases 46a, 46b, 46c, 46d ... Ribs 46e ... Flexible Hooks 45a, 45b, 45c, 45d for preventing the printed circuit board from coming off and coming off. Hall element terminals

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G03B 3/10 13/34 G03B 3/10

Claims (8)

[Claims] 1. A drive device for rotating a rotor magnet by a magnetic force generated in a stator around which a coil is wound by energizing a coil arranged in a housing means, on a non-output side of a rotating shaft of the rotor. A driving device characterized in that an opening through which a terminal of the coil penetrates is formed on an end face of the housing means at one end side, and a rib having a predetermined height is formed at an edge of the opening. 2. The drive according to claim 1, wherein the rib is used as a positioning unit and a guiding unit of a biasing unit that abuts against an end surface of a rotation shaft of a rotor and biases the other end side. apparatus. 3. A rotor magnet is rotated by a magnetic force generated in a stator around which the coil is wound by energizing a coil arranged in the housing means, and the rotor is arranged by a hall element arranged in the housing means. In a drive device of a light quantity adjusting device for detecting the position of a magnet, an opening through which a terminal of the coil and the hall element penetrates is formed on an end face of the housing means on one end side which is a non-output side of a rotation shaft of the rotor. And a rib having a predetermined height is formed on the edge of the opening. 4. The coil terminal according to claim 1 or 3, wherein a terminal of the coil is embedded in a bobbin around which the coil is wound, and a height of the rib is higher than a height of the coil entwined with the terminal. Drive. 5. The engaging member according to claim 3, wherein an engaging member for engaging and holding a flexible printed circuit board arranged on the outer end surface is provided on the outer end surface on one end side of the accommodating means. A drive device characterized in that the rib is formed higher than the engaging surface. 6. The drive device according to claim 3, wherein the rib also serves as a guide member for guiding the Hall element to the mounting position of the housing means. 7. The drive device according to claim 1, wherein the rotor is magnetized to have multiple poles, and the stator has a plurality of pole teeth to form a stepping motor. 8. The drive device according to claim 3, wherein the rotational force of the rotor magnet forms a drive unit of a light amount adjusting device that drives a diaphragm member to adjust the light amount.