JPH0815593A - Lens barrel device and driving device for substance to be driven - Google Patents

Abstract

PURPOSE:To provide a lens barrel device capable of simplifying external shape without locating a guide means such as a guide shaft on the outside. CONSTITUTION:This lens barrel device is provided with a lens barrel 20, a lens 2 arranged in the lens barrel, a holding means 35 holding the lens and provided with a coil 35, a yoke 11 arranged in the lens barrel corresponding to the periphery of the holding means, a magnet 12 arranged in the yoke 11 so that the holding means may be moved in the lens barrel and constituting a linear actuator with the coil by energizing the coil, and guiding means 14a and 14b guiding the lens holding means 35 along the lens barrel 20 by driving the linear actuator and arranged at positions more inside in the radial direction than the yoke 11, the magnet 12 and the coil 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel device and a drive device for a driven body which can be applied to, for example, a lens system of a video camera.

[0002]

2. Description of the Related Art For example, a lens system of a video camera has a structure as shown in FIGS. Figure 7
Shows an assembled state of the lens system, and FIG. 8 is an exploded view thereof. The yoke assembly 501 includes the rear lens barrel 5
It is arranged corresponding to 12. First group lens part assembly 5
A second lens group assembly 503, a third lens group assembly 504, and a fourth lens group assembly 505 are arranged between the lens cap 506 and the rear lens barrel 512.

The second group lens section assembly 503 includes a guide shaft 5
07 and 507 make it possible to move in the axial direction. Similarly, the fourth-group lens unit assembly 505 includes the guide shaft 50.
It can be moved in the axial direction by 7. These second lens group assembly 503 and fourth lens group assembly 505
Can be moved along the guide shaft 507 by magnetic linear actuators.

[0004]

However, the guide shafts 507 and 507 of the second lens group assembly 503 are arranged radially outside the yokes, bobbins 510 and coils of the second lens group assembly 503. Similarly, the guide shafts 507 and 507 of the fourth group lens unit assembly 505 are located outside the yoke 501, the bobbin 508, and the coil 509 of the fourth group lens unit assembly 505.

Therefore, the external dimensions increase and the weight also increases. Moreover, since the guide shaft is located outside, the outer shape is not simple, and when mounting this lens system to the set, it is necessary to set this lens system in a place where it does not interfere with other parts, The degree of freedom of setting is low.

The present invention has been made to solve the above-mentioned problems, and a lens barrel device and a driven device which can simplify the outer shape without locating guide means such as a guide shaft outside. It is intended to provide a body drive.

[0007]

According to the first aspect of the present invention, there is provided a lens barrel, a lens arranged in the lens barrel, and a holding means for holding the lens. The holding means having a coil, and a yoke arranged in the lens barrel corresponding to the periphery of the holding means,
A magnet arranged in the yoke for moving the holding means in the lens barrel, the magnet forming a linear actuator by the coil by energizing the coil, and the linear actuator. A guide means for guiding the holding means of the lens along the lens barrel by driving, and the guide means is arranged at a position radially inward of the yoke, the magnet, and the coil. This is achieved by a lens barrel device including guide means.

In the first invention, preferably, the lens is a zoom lens or a focus lens. In the first invention, preferably, the guide means includes a first shaft and a second shaft.

In the second invention, the above object is to provide a lens barrel, a lens arranged in the lens barrel, a holding means for holding the lens, and a magnet. A holding means, a yoke arranged in the lens barrel corresponding to the periphery of the holding means, and a coil arranged in the yoke for moving the holding means in the lens barrel. A guide means for guiding the holding means of the lens along the lens barrel by driving the coil, which constitutes a linear actuator by the magnet by energizing, and the linear actuator. A lens barrel device that includes the yoke, the coil, and the guide unit arranged at a position radially inward of the magnet, It is made.

In the second invention, preferably, the lens is a zoom lens or a focus lens. In the second invention, preferably, the guide means includes a first shaft and a second shaft.

Further, in the third aspect of the present invention, the above object is provided with a tubular body and a coil, the driven body disposed in the tubular body, and the tubular body corresponding to the periphery of the driven body. A linear actuator is configured by a yoke arranged in the body and a magnet arranged in the yoke for moving the driven body in the cylindrical body, by energizing the coil to form a linear actuator. A magnet,
A guide means for guiding the driven body along the cylindrical body by driving the linear actuator, which is arranged at a position radially inward of the yoke, the magnet, and the coil. It is achieved by a driving device for a driven body, comprising: the guide means.

Further, in the fourth aspect of the present invention, the above object is provided with a tubular body and a magnet, the driven body disposed in the tubular body, and the tubular body corresponding to the periphery of the driven body. A yoke arranged in the body, and a coil arranged in the yoke for moving the driven body in the cylinder, the coil constituting a linear actuator by energizing the magnet, By driving the linear actuator, the driven body,
A guide unit for guiding along the cylindrical body, comprising: the yoke, the coil, and the guide unit arranged at a position radially inward of the magnet; To be achieved.

[0013]

According to the above structure, in the first aspect of the invention, the holding means for holding the lens can be moved and positioned in the lens barrel along the guide means by driving the linear actuator. Since the guide means is arranged at a position radially inward of the yoke, the magnet, and the coil, the guide means does not protrude radially outward from the yoke, and the outer shape of the lens barrel is neat. Also,
In the second invention, by driving the linear actuator, the holding means for holding the lens can be moved and positioned in the lens barrel along the guide means. Since the guide means is arranged at a position radially inward of the yoke, the coil, and the magnet, the guide means does not protrude radially outward from the yoke, and the outer shape of the lens barrel is neat.

Further, according to the third aspect of the invention, by driving the linear actuator, the driven body can be moved and positioned in the cylindrical body along the guide means. Since the guide means is arranged at a position radially inward of the yoke, the magnet, and the coil, the guide means does not protrude radially outward from the yoke, and the outer shape of the tubular body is neat. Further, according to the fourth aspect of the invention, by driving the linear actuator, the driven body can be moved and positioned in the cylindrical body along the guide means. Since this guide means is arranged at a position radially inward of the yoke, the coil, and the magnet, the guide means does not protrude radially outward from the yoke,
The outer shape of the cylinder is clean.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

FIG. 1 shows a first preferred embodiment of the lens barrel device of the present invention. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is an exploded perspective view of the lens barrel device of FIG. This lens barrel device is a preferred example of a drive device for a driven body. In FIG. 1, the lens barrel device includes a lens barrel 20, a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4, and an iris unit 1.
8 and a CCD unit 19 and the like.

The rear side of the lens barrel 20 is a rear barrel 20a.
Has become. The lens barrel 20 is also called a main lens barrel, and an intermediate frame 21 is arranged in the center thereof. The first group lens 1 is located in the front part of the lens barrel 20. The second group lens 2 is located behind the first group lens 1. Iris unit 18
Is located in the center of the lens barrel 20 and in front of the third lens group 3. The third group lens 3 is located in front of the fourth group lens 4. The fourth lens group 4 is a third lens group 3 and a CCD.
It is located between the units 19. The intermediate frame 21 holds the third group lens 3. A CCD unit 19 is arranged in the rear barrel 20a.

As shown in FIGS. 1 to 3, the zoom yoke 11 is fixed along the front half of the inner peripheral surface of the lens barrel 20. The zoom yoke 11 has a cylindrical shape. A cylindrical zoom magnet 12 is fixed to the inner peripheral surface of the zoom yoke 11.

The second group lens 2 is held by a zoom bobbin (integrated with the lens frame) 5. This zoom bobbin 5 has 2
A holding means for holding the group lens 2, and a coil 3
Have five. The coil 35, the second group lens 2, and the zoom bobbin 5 are so-called driven bodies that are driven (moved) in the arrow X direction.

The coil 35, the zoom magnet 12, and the zoom yoke 11 constitute a linear actuator. By energizing the coil 35, the zoom bobbin 5 of the driven body is moved in the arrow X direction (the axial direction of the lens barrel device). ), And can be positioned at a desired position. The outer peripheral surface of the coil 35 faces the zoom magnet 12 at a distance. As shown in FIG. 1, a zoom yoke cover 13 is set on the rear end side of the zoom yoke 11 and the zoom magnet 12.

The focus yoke 15 is fixed to the rear half of the inner peripheral surface of the lens barrel 20. This focus yoke 1
A cylindrical focus magnet 16 is fixed to the inner peripheral surface of the roller 5.

The fourth group lens 4 is held by a focus bobbin (integrated with the lens frame) 6. The focus bobbin 6 is a holding means for holding the fourth group lens 4,
The coil 135 is provided. The fourth group lens 4, the focus bobbin 6, and the coil 135 are so-called driven bodies that are driven (moved) in the arrow X direction. Coil 1
35, focus magnet 16, focus yoke 1
Reference numeral 5 denotes a linear actuator, and the coil 1
By energizing 35, the focus bobbin 6 of the driven body can be moved in the arrow X direction and positioned at a desired position. The focus yoke cover 17 is fixed to the lens barrel 20.

As shown in FIG. 1, inside the lens barrel 20,
Guide shafts 14a and 14b as guide means are arranged parallel to each other and along the arrow X direction. One ends of the guide shafts 14a and 14b are fixed to the front end side of the lens barrel 20, and the rear ends of the guide shafts 14a and 14b are fixed to the rear end of the lens barrel 20.

The front half portions of the guide shafts 14a and 14b are located radially inward of the zoom yoke 11, the zoom magnet 12, and the coil 35. That is, the front half portions of the guide shafts 14a and 14b are located between the zoom magnet 35 and the second group lens 2. In addition, the guide shaft 14
The second half of a and 14b includes the focus yoke 15, the focus magnet 16, and the coil 13 of the focus bobbin 6.
It is located radially inward of 5. Moreover, it passes through part of the focus coil 135.

That is, as shown in FIGS. 2 and 3, the guide shafts 14a and 14b are provided with the zoom bobbin 5 as shown in FIG.
Through the zoom yoke cover 13, the hole of the focus bobbin 6, the inside of the focus magnet 16, and the focus yoke cover 17. These guide shafts 14 are provided on almost both sides of the iris unit 18.
The iris unit 18 is attached to the lens barrel 20 so that the shafts 14a and 14b can escape.

FIG. 4 shows the operating principle of the magnetic linear actuator in the embodiment of FIGS. When the coil 35 (or 135) is energized, a magnetic flux indicated by an arrow flows, and a thrust force is generated in the zoom bobbin 5 or the focus bobbin 6 due to the linkage of the magnetic flux and the current. It is preferable that these coils have two or more phases.

By appropriately energizing the coils 35 and 135 of FIG. 1, respectively, the second group lens 2 and the fourth group lens 4 are
Guided along the guide shafts 14a and 14b, it can be appropriately moved in the arrow X direction and positioned. That is, a zoom operation can be performed by moving and positioning the second group lens 2, and a focusing operation can be performed by moving the fourth group lens 4.

Next, referring to FIG. 5, another preferred embodiment 2 of the present invention will be described. In the first embodiment shown in FIG. 1, coils 35 and 135 are provided on the zoom bobbin 5 and the focus bobbin 6, which are driven bodies, respectively. That is, the coil side moves and the magnet side is fixed. On the other hand, FIG.
In the second embodiment, the magnet moves and the coil is arranged on the fixed side.

In FIG. 5, the lens barrel device includes a lens barrel 20, a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4, an iris unit 18 and a CCD.
It has a unit 19 and the like.

The rear side of the lens barrel 20 is the rear barrel 20a.
Has become. The lens barrel 20 is also called a main lens barrel, and an intermediate frame 21 is arranged in the center thereof. The first group lens 1 is located in the front part of the lens barrel 20. The second group lens 2 is located behind the first group lens 1. Iris unit 18
Is located in the center of the lens barrel 20 and in front of the third lens group 3. The third group lens 3 is located in front of the fourth group lens 4. The fourth lens group 4 is a third lens group 3 and a CCD.
It is located between the units 19. The intermediate frame 21 holds the third group lens 3. A CCD unit 19 is arranged in the rear barrel 20a.

The zoom yoke 11 is fixed along the front half of the inner peripheral surface of the lens barrel 20. This zoom yoke 11
Is a cylindrical shape. A cylindrical zoom coil 112 is fixed to the inner peripheral surface of the zoom yoke 11.

The second group lens 2 is held by the zoom bobbin 5. The zoom bobbin 5 is a holding unit for holding the second group lens 2 and has a magnet 122. The magnet 122, the second group lens 2, and the zoom bobbin 5 are so-called driven bodies that are driven (moved) in the arrow X direction.

The coil 112, the zoom magnet 122, and the zoom yoke 11 constitute a linear actuator. By energizing the coil 112, the zoom bobbin 5 of the driven body is moved in the arrow X direction (the axial direction of the lens barrel device). ), And can be positioned at a desired position. The outer peripheral surface of the coil 112 faces the zoom magnet 122 with a space. As shown in FIG. 5, a zoom yoke cover 13 is set on the rear ends of the zoom yoke 11 and the coil 112.

The focus yoke 15 is fixed to the rear half of the inner peripheral surface of the lens barrel 20. This focus yoke 1
A cylindrical coil 116 is fixed to the inner peripheral surface of 5.

The fourth group lens 4 is held by the focus bobbin 6. This focus bobbin 6 is a fourth group lens 4
And a focus magnet 123. The fourth group lens 4, the focus bobbin 6, and the magnet 123 are so-called driven bodies that are driven (moved) in the arrow X direction. Coil 1
16, the focus magnet 123, and the focus yoke 15 constitute a linear actuator, and by energizing the coil 116, the focus bobbin 6 of the driven body is moved in the arrow X direction and positioned at a desired position. You can do it. The focus yoke cover 17 is fixed to the lens barrel 20.

As shown in FIG. 5, inside the lens barrel 20,
Guide shafts 14a and 14b as guide means are arranged parallel to each other and along the arrow X direction. One ends of the guide shafts 14a and 14b are fixed to the front end side of the lens barrel 20, and the rear ends of the guide shafts 14a and 14b are fixed to the rear end of the lens barrel 20.

The front half portions of the guide shafts 14a and 14b are located radially inward of the zoom yoke 11, the coil 112, and the zoom magnet 122 of the zoom bobbin 5.
That is, the front halves of the guide shafts 14a and 14b are located between the zoom magnet 135 and the second lens group 2. The latter half of the guide shafts 14a and 14b are located radially inward of the focus yoke 15, the coil 116, and the magnet 123 of the focus bobbin 6.

That is, the guide shafts 14a and 14b pass through the hole of the zoom bobbin 5, the zoom yoke cover 13, the hole of the focus bobbin 6, the inner side of the focus magnet 16, and the focus yoke cover 17. are doing. These guide shafts 14a and 14b pass through almost both sides of the iris unit 18.
The iris unit 18 is attached to the lens barrel 20 so as to escape the a and 14b.

FIG. 6 shows the operating principle of the magnetic linear actuator in the embodiment of FIG. Coil 112
By energizing (or 116), the magnetic flux indicated by the arrow flows, and due to the linkage of the magnetic flux and the current, the zoom bobbin 5
Alternatively, thrust is generated in the focus bobbin 6. It is preferable that these coils have two or more phases.

By appropriately energizing the coils 112 and 116 of FIG. 5, respectively, the second group lens 2 and the fourth group lens 4
Is guided along the guide shafts 14a and 14b, and can be appropriately moved in the arrow X direction to be positioned. That is, a zoom operation can be performed by moving and positioning the second group lens 2, and a focusing operation can be performed by moving the fourth group lens 4.

According to the embodiment described above, the guide shaft 14
a and 14b are the zoom yoke 11 and the focus yoke 15
Does not go outside the Therefore, the outer dimensions of the zoom yoke 11 and the focus yoke 15 are substantially determined by the diameter of the zoom yoke 11. Further, since the shafts 14a and 14b do not protrude outward in the radial direction, the entire lens barrel device has a substantially cylindrical shape, and can have a simple outer shape as compared with the conventional one.

The present invention is not limited to the above embodiment. For example, instead of using the round rod-shaped guide shafts 14a and 14b, a guide rail is provided inside the zoom yoke 11 and the focus yoke 15, and the zoom bobbin 5 and the focus bobbin 6 move along the guide rails. good. In this case, a guide rail having a concave cross section is provided on the yoke side, and a guide rail having a convex cross section is provided on the bobbin side to engage them. Even in this case, preferably, the guide rails having a convex cross section on the bobbin 5, 6 side are
It is inside the coil 35 of the embodiment of FIG. 1 and inside the magnet 122 of the embodiment of FIG.

A guide rail having a convex cross section may be provided on the yoke side, and a guide rail having a concave cross section may be provided on the bobbin side. Further, the guide rail described above may be used on only one of the guide shafts 14a and 14b.

In the illustrated embodiment described above, the lens barrel device of the present invention is applied to the lens system of the video camera. However, the present invention is not limited to this, and it is also possible to apply the lens barrel device of the present invention to devices in other areas or in other fields. In the above-mentioned embodiment, the driven body is provided with the bobbin for holding the lens, but other types may be used.

[0045]

As described above, according to the present invention, the outer shape can be simplified without locating the guide means such as the guide shaft outside.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first preferred embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an exploded perspective view of the first embodiment shown in FIG.

FIG. 4 is a diagram showing the operating principle of the magnetic linear actuator of the embodiment of FIG.

FIG. 5 is a sectional view showing another preferred embodiment 2 of the present invention.

FIG. 6 is a diagram showing the operating principle of the magnetic linear actuator of the embodiment of FIG.

FIG. 7 is a diagram showing a lens system of a conventional video camera.

8 is an exploded perspective view of the conventional lens system of FIG.

[Explanation of symbols]

1 1st group lens 2 2nd group lens 3 3rd group lens 4 4th group lens 5 Zoom bobbin (driven body, holding means) 6 Focus bobbin (driven body, holding means) 11a, 11b Zoom yoke 12a, 12b Zoom magnet 13 Zoom Yoke cover 14a, 14b Guide shaft (guide means) 15 Focus yoke 16a, 16b Focus magnet 17 Focus yoke cover 18 Iris unit 19 CCD unit 20 Main lens barrel (lens barrel, barrel) 20a Rear lens barrel 21 Intermediate frame

Claims (8)

[Claims] 1. A lens barrel, a lens arranged in the lens barrel, a holding unit for holding the lens, the holding unit including a coil, and the holding unit around the holding unit. A yoke arranged in the lens barrel, and a magnet arranged in the yoke for moving the holding means in the lens barrel, the coil being linear by energizing the coil; A guide unit for guiding the holding unit of the lens along the lens barrel by driving the magnet forming the actuator and the linear actuator, the yoke, the magnet, and the coil. And a guide unit arranged at a position radially inward of the lens barrel device. 2. The lens barrel device according to claim 1, wherein the lens is a zoom lens or a focus lens. 3. The lens barrel device according to claim 1, wherein the guide unit includes a first axis and a second axis. 4. A lens barrel, a lens arranged in the lens barrel, a holding unit for holding the lens, the holding unit including a magnet, and the holding unit around the holding unit. A linear actuator is configured by a yoke arranged in the lens barrel, and a coil arranged in the yoke for moving the holding means in the lens barrel, and the magnet when energized. A guide means for guiding the holding means of the lens along the lens barrel by driving the coil and the linear actuator, and the radius is larger than that of the yoke, the coil, and the magnet. And a guide unit arranged at a position on the inner side in the direction, the lens barrel device. 5. The lens barrel device according to claim 4, wherein the lens is a zoom lens or a focus lens. 6. The lens barrel apparatus according to claim 4, wherein the guide unit includes a first axis and a second axis. 7. A tubular body, a driven body disposed in the tubular body, comprising a coil, a yoke arranged in the tubular body around the driven body, and the driven body. A magnet arranged in the yoke for moving in the cylinder, the magnet constituting a linear actuator by energizing the coil, and by driving the linear actuator, Guide means for guiding a driven body along the tubular body, comprising: the yoke, the magnet, and the guide means arranged at a position radially inward of the coil. And a drive device for the driven body. 8. A cylindrical body, a driven body which is provided inside the cylindrical body, and which is provided with a magnet, a yoke which is arranged inside the cylindrical body so as to correspond to the periphery of the driven body, and the driven body. A coil disposed in the yoke for moving in the cylinder, the coil constituting a linear actuator by the magnet when energized, and the driven body by driving the linear actuator. A guide means for guiding along the tubular body, the guide means being arranged at a position radially inward of the yoke, the coil, and the magnet. Driving device for driving body.