CN87210924U - Driving motor of camera lens - Google Patents

Abstract

The utility model discloses a driving motor whose each winding is arranged on the periphery of the stage part of the fixed lens barrel part of the lens barrel body part to form a stator yoke iron. The inner surface of the stage part is provided with a screw thread mechanism which is matched with the mechanism which is formed on the periphery of the front end barrel part of the lens barrel body part. A rotor magnet is fixed on the inner perimeter of a flange type part which surrounds the stator yoke iron and extends backwards.

Description

Driving motor of camera lens

The utility model is about the CD-ROM drive motor of camera lens built-in between lens barrel and the fixed lens barrel.

The CD-ROM drive motor of camera lens of the present utility model, it is the outside at the stator of the stator yoke of fixed lens barrel part and winding and yoke material formation, the rotor that the rotor magnet that the outside shell portion of lens barrel is arranged and form in interior week of this outside shell portion partly constitutes, it is the thing of so-called outer-rotor type, make when lens barrel body part of the video camera that lens barrel and fixed lens barrel etc. constitute can miniaturization light and handyization, also can make the torque increase of lens barrel.

For example, the lens barrel of video video camera is that the lens driving by hollow shape built-in between this lens barrel and the fixed lens barrel is promoted with PM type step motor and moves along optical axis direction, thereby amasthenic lens is focused automatically.

Following elder generation carries out simple explanation to accompanying drawing:

Fig. 1 is the principal section figure that shows the video camera lens barrel part of the utility model embodiment,

Fig. 2 is the sectional view of the lens barrel first half of the video camera that has earlier.

In Fig. 2, constitute between the lens barrel 1 and fixed lens barrel 2 of lens barrel first half of video video camera, the lens driving of built-in inner-rotor type is with PM type step motor 3.That is, lens barrel 1 be two layers cylindraceous, its outside cylindrical shell partly 1a is a focusing ring.The rotor magnet part 4 that rubber system is arranged in interior week of inboard cylinder body part 1b of this lens barrel 1, these inboard cylinder body portion 1b and rotor magnet part 4 have just constituted the rotor of above-mentioned step motor 3.

In addition, fixing photography lens barrel end parts is that two layers of formation are cylindraceous, and the periphery of the periphery of its inboard cylinder body portion 2b and the inboard cylinder body portion 1b of above-mentioned lens barrel 1 can be twisted pivotally by screw thread and closed.This fixed lens barrel 2 locate side neck body portion 2a as the stator yoke iron part, this outside shell portion 2a and the inboard of this outside shell portion 2a install annularly 2 mutually winding 6,6 and have the utmost point tooth yoke parts 7 of a plurality of utmost point tooth (not shown) to constitute the stator of above-mentioned step motor 3 in interior perimembranous.The revolution of the rotor of this step motor 3 makes the inboard fore-end of inboard cylinder body 1b that the above-mentioned lens barrel of amasthenic lens 8 is housed, and moves along optical axis direction with respect to fixed lens barrel 2, thereby can focus automatically.This like configurations is disclosed in the spy and opens in clear 60-151606 number.

In recent years along with the video video camera miniaturization and lightness, wish the further miniaturization of lens barrel body portion and the lightness of video video camera, yet between the rotor magnet part 4 and utmost point tooth yoke parts 7 of lens barrel 1, and between the outer peripheral face of the outside shell portion 2a of the inner peripheral surface of the outside shell portion 1a of lens barrel 1 and fixed lens barrel 2 required separately gap must be set, when therefore the wall thickness of the external diameter of lens barrel 1 and fixed lens barrel 2 increases, should make the not important place installation mutually of screw thread 5 of the inboard cylinder body portion 1b of amasthenic lens 8 and lens barrel 1, therefore the length of the optical axis direction of lens barrel 1 is elongated, and the miniaturization lightness of above-mentioned lens barrel body portion just is difficult to accomplish.

In addition, step motor 3 is to belong to the inner-rotor type that rotor is arranged in the stator inboard, because it is little to make lens barrel 1 carry out the radius of rotating magnet segment 4, so the torque of lens barrel 1 is also little.

Also have, the magnet segment 4 of lens barrel 1, for example use the ferro-gum of the thin plate band shape of multipole magnetization, with adhesive securement on the outer peripheral face of the inboard cylinder body portion 1b of lens barrel 1 and form, so because elastic force of ferro-gum, its seam portion is floated easily laterally, thus ferro-gum critically bonding on the outer peripheral face of above-mentioned inboard cylinder body portion 1b be difficult, reliability is also low.

Therefore, the utility model provides a kind of lens driving motor of video camera, and it can make the miniaturization of lens barrel body portion and the lightness of video camera, and the torque of lens barrel is further improved.

The lens driving motor of video camera of the present utility model is, supporting pivotally cooperating on the inboard cylinder body portion of two layers of columnar lens barrel, on the fore-end periphery of columnar fixed lens barrel, be formed with stator yoke iron, the outside of the ring-shaped winding that is disposing in the outside of this stator yoke iron part, disposing the utmost point tooth yoke parts of a plurality of utmost point teeth, separate required gap from the outer peripheral face of these utmost point tooth yoke parts, facing to be the rotor magnet part that go up to form in interior week of the outside shell portion of above-mentioned lens barrel.

The stator yoke iron of fixed lens barrel is partly gone up the outside of the utmost point tooth yoke parts that setting across winding, is the rotor magnet part of the outside shell portion of lens barrel, so lens barrel turns round smoothly with big torque.In addition, the external diameter of lens barrel diminishes, and makes lens barrel and fixed lens barrel become miniaturization and lightness.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail, in addition, the part identical with the structure that has earlier used identical symbol.

In the lens barrel of the video video camera shown in Fig. 1 part, two layers of columnar lens barrel 1 and the columnar fixed lens barrel 2 that this lens barrel 1 is being supported have pivotally constituted the lens barrel body first half of video video camera.Between the stator yoke iron part 2b that forms on the outside shell portion 1a of this lens barrel 1 and the fore-end periphery of fixed lens barrel 2, the lens driving of built-in the outer-rotor type that focuses on usefulness is with PM type step motor 3.In detail, in the interior week of the periphery of the inboard cylinder body portion 1b of lens barrel 1 and the stator yoke iron part 2b of fixed lens barrel 2, lump together with screw thread 5 is stubborn pivotally.Disposing the winding 6,6 of 2 phases of annular on the outside of this stator yoke iron part 2b,, disposing the (not shown) utmost point tooth yoke parts 7 of a plurality of utmost point teeth at outer peripheral portion simultaneously in the outside of each winding 6.These stator yoke iron part 2b and winding 6 and utmost point tooth yoke parts 7 have constituted the stator of above-mentioned step motor 3.

Outer peripheral face (each utmost point tooth) from above-mentioned utmost point tooth yoke part 7 separates required gap, facing to interior week of outside shell portion 1a of above-mentioned lens barrel 1 on, be formed with rotor magnet part 4.This rotor magnet part 4 is, for example, and the ferro-gum of the thin plate band shape of the multipole magnetization that matches of the pitch of the utmost point tooth of utmost point tooth yoke parts 7, be pressed in the inner peripheral surface of outside shell portion 1a and form.The stator that the outside shell portion 1a of these lens barrels 1 and rotor magnet part 4 have constituted above-mentioned step motor 3.Also have, the outside shell portion 1a of this lens barrel 1 is as focusing ring, on the inboard fore-end of the inboard cylinder body portion 1b of lens barrel 1, with the front of the screw thread 5 in the outside not mutually the important place assembling amasthenic lens 8.

In addition, on the base portion 2c of said fixing lens barrel 2, the lens driving of the inner-rotor type that built-in varifocal is used is with PM type step motor 10.That is, in the inner recess of the base portion 2c of fixed lens barrel 2, disposing the winding 11,11 of 2 phases of annular, simultaneously, on the inboard of each winding 11, the (not shown) utmost point tooth yoke parts 12 of a plurality of utmost point teeth are being arranged on the circumferential portion in disposing.These base portions 2c and winding 11 and utmost point tooth yoke parts 12 have constituted the stator of above-mentioned step motor 10.

And, in the inboard of the base portion 2c of said fixing lens barrel 2, supporting columnar rotor yoke iron 13 pivotally by the bearing (not shown).In the outside of this rotor yoke iron 13, the inner peripheral surface (each utmost point tooth) from above-mentioned utmost point tooth yoke parts 12 separates required gap, is installing columnar ferro-gum 14.These rotor yoke irons 13 and ferro-gum 14 have constituted the rotor of above-mentioned step motor 10.

Also have, on the inner peripheral surface of above-mentioned rotor yoke iron 13, be formed with pair of cams groove 13a, 13b.In this a pair of cam path 13a, 13b, cooperating the driven device part of the cam of support of supporting conversion camera lens and compensation camera lens (these some all not shown in the drawings).In addition, above-mentioned rotor yoke iron 13 by pin 16, is being connected with the varifocal ring 15 that can assemble pivotally on the outer peripheral face of the base portion 2c of fixed lens barrel 2.The front of this pin 16, the button 17 of integrally formed ranging computer structure conversion usefulness, this button 17 is outwards protruded by the outer peripheral face of the base portion 2c of fixed lens barrel 2.

Still have, symbol 18 is iris apparatus that the base end part of fixed lens barrel 2 is embedding, and symbol 19 keeps the body tube of main lens (not shown) etc. in being.These iris apparatus 18, body tube 19 and above-mentioned lens barrel 1, fixed lens barrel 2 has constituted the lens barrel body portion of video video camera.

In embodiment as above, the lens driving that focuses on usefulness has been made outer-rotor type with step motor 3, rotor magnet part 4 and focusing ring (outside barrel 1a of lens barrel 1) can be shared, simultaneously, the inboard of the inboard cylinder body 1b of lens barrel 1, for can and the front of the screw thread 5 in the outside not mutually the important place adorning amasthenic lens 8, the axial length of the external diameter of lens barrel 1 and lens barrel 1 can shorten, the lens barrel body portion of the video camera of recording is miniaturization and lightness further.

Also have, make lens barrel 1 carry out the diameter of rotating magnet segment 4, for big, so the torque of lens barrel 1 further increases than the diameter of the inner-rotor type that has earlier, and lens barrel 1 can turn round smoothly and power consumption is descended.

In addition, the rotor magnet part 4 of the outside shell portion 1a of lens barrel 1 just, for example the ferro-gum of thin plate band shape is pressed among the shell portion 1a laterally, operation so simply, just accurately fix on the side face within it, therefore do not need cost is reduced with there being such bonding agent next bonding earlier, simultaneously, reliability is further improved.

Also have, focus on and each winding 6,11 of each step motor 3,10 of using of varifocal and the fixed lens barrel 2 that disposes them form one, so lens barrel 2 can make thin-walled, so just can accomplish lightness, simultaneously, the minimizing of number of packages purpose makes the assembling improvement in addition.

Still have, in the above-described embodiments, be pressed into ferro-gum on the inner peripheral surface of the outside shell portion 1a of lens barrel 1 and form rotor magnet part 4, therefore, outside shell portion 1a forms with plastic magnet, can dual-purpose be rotor magnet part and focusing ring.In addition, show the occasion that is suitable for of video video camera in the above-described embodiments, still, also can be applicable to other video cameras of commonness photograph machine and so on certainly.

As mentioned above, the utility model is, the winding that disposes in the stator yoke iron outside partly of fixed lens barrel and the outside of utmost point tooth yoke parts, separate required gap from the outer peripheral face of these utmost point tooth yoke parts, on the interior week of the outside of lens barrel shell portion, be formed with the rotor magnet part, the external diameter of lens barrel and axial length etc. are diminished, and then the lens barrel body portion that can make video camera miniaturization and lightness further.Also have, the rotor magnet of lens barrel is partly than the lens driving that has earlier the more outer of motor, so the torque of lens barrel can increase.

Claims (1)

1, a kind of lens driving motor of video camera, it is characterized by, the inboard cylinder body portion of two layers of columnar lens barrel is being cooperated on the fore-end periphery of the fixed lens barrel of also supporting pivotally cylindraceous, be formed with the stator yoke iron part, the outside of the winding of the annular that is disposing in the outside of this stator yoke iron part, disposing the utmost point tooth yoke parts of a plurality of utmost point teeth, separate required gap from the outer peripheral face of these utmost point tooth yoke parts, on the interior week of the outside shell portion of above-mentioned lens barrel, be formed with the rotor magnet part.

Images