WO2009145041A1

WO2009145041A1 - Lens barrel, imaging device, and portable electronic apparatus

Info

Publication number: WO2009145041A1
Application number: PCT/JP2009/058715
Authority: WO
Inventors: 芳史三谷; 武彦田中
Original assignee: コニカミノルタオプト株式会社
Priority date: 2008-05-28
Filing date: 2009-05-09
Publication date: 2009-12-03

Abstract

A small-sized, thin lens barrel, an imaging device, and a portable electronic apparatus. The lens barrel has lens frames for holding, on a light path, lenses and a shutter which is provided between lenses, and also has spacers separately arranged outside the light path to determine the distance between the lenses sandwiching the shutter. The shutter is provided with a rotary actuator, a first light blocking blade, and a second light blocking blade. A cutout is formed in the first light blocking blade such that, when the first light blocking blade is at a retracted position, the cutout is located in one side of the first light blocking blade, which side is on the far side of the blade away from the light path, and at a position closer to a first support shaft than to the light path. The cutout is adapted to receive at least a part of a second support shaft and at least a part of one of the spacers.

Description

Lens barrel, imaging device, and portable electronic device

The present invention relates to a lens barrel, an imaging device, and a portable electronic device.

】 Digital cameras and camera-equipped mobile phones are becoming smaller and higher in performance, and the need to accurately assemble relative positions between optical members is increasing. Patent Document 1 describes a structure in which a prism-like member is provided on a prism and is brought into contact with the shutter so that the relative position between the shutter and the prism is accurately maintained.

Such a columnar member needs to be provided at three or more discrete positions around the optical axis, avoiding the movable part of the shutter, and in particular, on the side where the light shielding blades and actuators of the shutter are arranged, a housing and There is no extra space between them, and there is a problem that the lens barrel is enlarged by the amount of the columnar member. In particular, a lens barrel mounted on a portable device is required to be as thin as 8 mm or less in the thickness direction, and it is necessary to reduce the dimensions at a very small level of 1 mm or less.

JP 2005-181717 A

In view of the above problems, an object of the present invention is to provide a small and thin lens barrel, an imaging device, and a portable electronic device in which a plurality of lenses are accurately positioned with a shutter interposed therebetween.

The problem of the present invention is solved by the following configuration.

1. A lens frame for holding a plurality of lenses and a shutter disposed between the plurality of lenses on an optical path;
A plurality of spacer portions that are discretely disposed outside the optical path and define a distance between the plurality of lenses sandwiching the shutter.
The shutter is
A rotary actuator that is arranged outside the optical path and swings around a central axis parallel to the optical axis, a drive pin extending parallel to the optical axis of the optical path;
A light shielding position that is pivotally supported by a first support shaft provided in parallel with the optical axis in the vicinity of the central axis of the rotary actuator and can block at least a part of the optical path by the drive pin, and the optical path is opened. A first light-shielding blade that swings between the retracted position and
A cam groove that is pivotally supported by a second support shaft provided in parallel with the first support shaft and engages with the drive pin is provided, and the first light shielding blade is in the light shielding position by swinging of the drive pin. A second light-shielding blade that blocks at least a part of the optical path;
The first light-shielding blade includes at least a part of the second support shaft at a part of the side that is far from the optical path at the retracted position, the distance from the first support shaft being closer to the optical path, and a plurality of A lens barrel having a notch for receiving at least a part of one of the spacer portions.

2. 2. The lens barrel according to claim 1, wherein the spacer portion received in the notch is disposed closer to the first support shaft than to the second support shaft.

3. 3. The lens barrel according to 1 or 2, wherein the second light shielding blade swings in a direction opposite to the first light shielding blade.

4. 4. The lens barrel according to claim 1, wherein the spacer portion is formed integrally with the lens frame.

5). At least one of the plurality of lenses is held on the ball frame via an auxiliary frame,
The said spacer part is integrally formed in the said ball frame or the said auxiliary | assistant frame, The said ball frame and the said auxiliary | assistant frame are contact | abutting, The said any one of 1 to 3 characterized by the above-mentioned. Lens barrel.

6. 6. The lens barrel according to 5, wherein the auxiliary frame is formed integrally with the lens held by the lens frame via the auxiliary frame.

7. 7. The lens barrel according to claim 1, wherein the drive pin is eccentric from the first support shaft toward the optical path.

8. The shutter is pivotally supported by a third support shaft provided at a position farther from the optical path than the first support shaft, and is provided with a cam groove that engages with the drive pin. 8. The lens barrel according to any one of 1 to 7, further comprising a third light shielding blade that shields at least a part of the optical path when the light shielding blade is in the light shielding position.

9. 9. The lens barrel according to any one of 1 to 8, wherein the first support shaft and the central axis of the rotary actuator are the same.

10. Furthermore, a cross section perpendicular to the optical axis has a substantially rectangular housing,
10. The lens barrel according to any one of 1 to 9, wherein, in the retracted position, the first light shielding blade extends substantially parallel to a long side of the housing.

11. A lens driving mechanism for moving the lens frame in the optical axis direction;
11. The lens barrel according to any one of 1 to 10, wherein the rotary actuator is disposed between the optical path and the lens driving mechanism.

12. An imaging apparatus comprising the lens barrel according to any one of 1 to 11 above.

13. 13. A portable electronic device comprising the imaging device according to 12.

According to the present invention, a lens frame that holds a plurality of lenses and a shutter disposed between the lenses on the optical path, and a plurality of lenses that are discretely disposed outside the optical path and sandwich the shutters therebetween. In a lens barrel having a plurality of spacer portions that define intervals, the shutter has a rotary actuator, a first light shielding blade, and a second light shielding blade, and the first light shielding blade is far from the optical path at its retracted position. By providing a notch for receiving at least a portion of the second support shaft and at least a portion of one of the plurality of spacer portions in a portion where the distance from the first support shaft on the side of the side is closer to the optical path. A thin lens barrel, an imaging device, and a portable electronic device can be provided.

1 is a sectional view in the optical axis direction of an imaging apparatus according to a first embodiment of the present invention. The expanded sectional view of the 2nd lens frame of the imaging device of FIG. FIG. 2 is a cross-sectional view of the imaging apparatus of FIG. 1 along the line AA. FIG. 2 is a layout diagram of light shielding blades at a retracted position of the imaging apparatus of FIG. 1. FIG. 2 is a layout diagram of light shielding blades at a light shielding position of the imaging apparatus of FIG. 1. The disassembled perspective view of the 2nd lens frame of the imaging device of 2nd Embodiment of this invention. FIG. 7 is a layout diagram of light shielding blades at a retracted position of the imaging apparatus of FIG. 6. FIG. 7 is a layout diagram of light shielding blades at a light shielding position of the imaging apparatus of FIG. 6. FIG. 9 is a layout diagram of light shielding blades at a retracted position of an imaging apparatus according to a third embodiment of the present invention. FIG. 10 is a layout diagram of light shielding blades at a light shielding position of the imaging apparatus of FIG. 9. FIG. 2 is a front view and a rear view of a mobile phone having the imaging device of FIG. 1.

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

FIG. 1 shows an imaging apparatus (digital camera module) 1 according to a first embodiment of the present invention. The imaging device 1 is formed by sealing an end of a substantially rectangular parallelepiped lens barrel 2 with a substrate 3.

The lens barrel 2 is screwed to a lead screw shaft 7 that holds a light receiving prism 5 fixed to the housing 4 and a first lens group 6 in a substantially box-shaped housing 4 and is screwed together. The first lens frame 8 movable in the optical axis X direction, the second lens group 9 and the third lens group 10 are held, and a shutter 11 is provided between the second lens group 9 and the third lens group 10. It has a second lens frame 12 that is held and screwed to the lead screw shaft 7 and can move in the direction of the optical axis X, and a fourth lens group 13 fixed to the housing 4. The substrate 3 includes a filter 14 and an image sensor 15.

In the imaging device 1, a light beam is incident on the light receiving prism 5 perpendicular to the paper surface, and the light receiving prism 5 bends the light beam at a right angle, and the first lens group 6, the second lens group 9, the third lens group 10, and the fourth lens group. 13 forms a light beam on the image sensor 15 and converts the image formed on the image sensor 15 into an electric signal.

FIG. 2 shows the second ball frame 12 in detail. The second lens frame 12 directly holds the second lens group 9, while the third lens group 10 holds via auxiliary frames 17 attached to a plurality of spacer portions 16 extending in the optical axis X direction. . The opening 18 of the second lens frame 12 main body and the opening 19 of the auxiliary frame 17 define the optical path of the light beam.

The shutter 11 includes a first support shaft 20 that is parallel to the optical axis X, and a second support shaft 21 that protrudes in parallel with the first support shaft 20 before the optical path (opening) 18 when viewed from the first support shaft 20. And a rotor 24 having a drive pin 23 that is eccentric from the first support shaft 20 toward the optical path 18 and protrudes in parallel with the first support shaft 20, and is rotatable around the first support shaft 20. And have. Further, the shutter 11 is pivotally supported by the first support shaft 20, and swings about the first support shaft 20 by the swing of the drive pin 23, and the first light shielding blade 25 that can be held on the optical path 18, The second light shielding blade 26 is pivotally supported by the two support shafts 21, swings about the second support shaft by the swing of the drive pin 23, and can be held on the optical path 18. Since the drive pin 23 is eccentric from the first support shaft 20 toward the optical path 18, the drive pin 23 is close to the second support shaft 21, and the second light-shielding blade 26 is a second support that is the center of oscillation thereof. Since it can drive in the position close | similar to the axis | shaft 21, the drive speed of the 2nd light-shielding blade 26 can be made quick.

3 shows a cross section taken along the line AA of FIG. 1 in which the lens barrel 2 is viewed from the auxiliary frame 17 to the shutter 11 side. The rotor 24 is a part of a commercially available rotary actuator that is rotationally driven by the drive source 27 via the transmission member 28 and is assembled integrally with the drive source 27 and the transmission member 28.

In this rotary actuator, the rotor 24 is composed of a magnet, the drive source 27 is composed of a coil that generates magnetic flux when energized, and the transmission member 28 is a yoke that guides the magnetic flux generated by the drive source 27 to the rotor 24. In this rotary actuator, the rotor 24 rotates around the first support shaft 20 according to the direction of the magnetic flux applied from the drive source 27 via the transmission member 28, and the drive pin 23 is swung.

The first light shielding blade 25 is pivotally supported by the first support shaft 20 and swings integrally with the drive pin 23 that passes therethrough. In addition, a notch 29 is formed on the side far from the optical path 18 and swings so as to receive the second support shaft 21 in the notch 29 so that the optical path 18 is not shielded in the illustrated retracted position. It can be retreated to open.

The second light shielding blade 26 has a cam groove 30 with which the driving pin 23 engages, and the second light shielding blade 26 swings in the opposite direction to the driving pin 23 and the first light shielding blade 25 by the swinging of the driving pin 23. . When the first light-shielding blade 25 is in the retracted position, the second light-shielding blade 26 also extends so as to be substantially orthogonal to the first light-shielding blade 25 and is disposed at the retracted position that opens the illustrated optical path 18.

Three spacer portions 16 are discretely provided at substantially equal angles around the optical path 18 (referred to as 16a, 16b, and 16c, respectively), and protrusions 31 that fit into the auxiliary frame 17 are formed. Has been.

The casing 4 has a substantially rectangular cross section perpendicular to the optical axis X, and its long side has a slight gap between the first light shielding blade 25 and the first light shielding blade 25 in parallel with the first light shielding blade 25 in the retracted position. Stretched. Accordingly, the gap between the first light shielding blade 25 and the housing 4 can be reduced, and the size of the housing 4 in the short side direction can be shortened.

Further, the lens barrel 2 includes a motor 32 that rotationally drives the lead screw shaft 7 with a connection gear (not shown), and a guide shaft 33 that locks the rotation of the second ball frame 12 around the lead screw shaft 7. The lead screw shaft 7 is disposed at one end of the casing 4 in the long side direction, and the guide shaft 33 is disposed at the other end of the casing 4 in the long side direction. As a result, the second lens frame 12 moves in the direction of the optical axis X in accordance with the rotation of the lead screw shaft 7. That is, the lead screw shaft 7 constitutes a lens driving mechanism that positions the second lens group 9 in the optical axis X direction.

Further, the second lens frame 12 is provided with a heavy actuator between the lead screw shaft 7 constituting the drive mechanism for driving the second lens frame 12 and the optical path 18. Thereby, the dimension of the direction orthogonal to the direction which connects a rotary actuator and the optical path 18 can be shortened. Further, since the drive source 27 is a coil extending in a direction parallel to the short side direction of the housing 4, the center of gravity of the entire second lens frame 12 including the shutter 11 is close to the lead screw shaft 7 constituting the drive mechanism. Less drive loss.

FIG. 4 shows the positional relationship when the first light shielding blade 25 and the second light shielding blade 26 are in the retracted position for opening the optical path 18, and FIG. 5 shows the first light shielding blade 25 and the second light shielding blade 26 in the optical path 18. The positional relationship when it is in the light-shielding position that shuts off is shown. As shown in the figure, the first light shielding blade 25 and the second light shielding blade 26 cooperate to shield the light path 18 from both sides. Thereby, the optical path 18 can be shielded in a short time.

The one spacer portion 16a is disposed in the notch 29 of the first light shielding blade 25 in the retracted position so as to be partially received further on the first support shaft 20 side than the second support shaft 21. The second support shaft 21 is provided at a position closer to the first support shaft 20 than the optical path 18 so as not to reduce the execution portion that blocks the light path 18 of the first light shielding blade 25. The spacer portion 16 a is provided further than the second support shaft 21, further from the first support shaft 20, and outside the swing range of the drive pin 23. Accordingly, the spacer portion 16a does not interfere when the second light shielding blade 26 is swung.

In the lens barrel 2, a spacer portion 16 a is disposed in a region between the first support shaft 20 and the retracted position of the first light shielding blade 25. For the first light shielding blade 25, since this region is not a part for covering the optical path 18, there is a degree of freedom in shape. Since the notch 29 is provided in the first light shielding blade 25 and the second support shaft 21 and the spacer part 16a are received in the notch 29, it is not necessary to provide a space for the spacer part 16a, and the second ball The frame 12 can be made small. Then, the distance between the outer side edge of the first light shielding blade 25 at the retracted position and the housing 4 is reduced, thereby realizing a reduction in thickness. Further, the

spacer portions

16a, 16b and 16c can be evenly arranged around the optical path 18, and the lens can be stably held. Here, receiving the second support shaft 21 and the spacer portion 16a in the notch 29 means that the first light shielding blade 25 is shielded from the light shielding side and the first shaft at the retracted position of the first light shielding blade 25 shown in FIG. The notch 29 that is an area surrounded by the two-dot chain line that smoothly connects the 20 side and the outer shape line of the first light shielding blade 25 includes at least a part of the second support shaft 21 and the spacer portion 16a. I mean.

The spacer portion 16 may be formed integrally with the auxiliary frame 17 and joined to the second ball frame 12. The auxiliary frame 17 may be formed integrally with the lens 10. That is, the lens 10 is a plastic lens, and a flange portion that is a peripheral portion of the lens comes into contact with the second lens frame 12. Since the lens 10 directly contacts the second lens frame 12, the accuracy of the lens position is improved. Furthermore, the

spacer portions

16b and 16c may be integrally formed continuously as long as they do not interfere with the shutter 11. The

spacer portions

16b and 16c may be in a region on the opposite side of the spacer portion 16a with the optical axis X in between.

In the present embodiment, the first support shaft 20 and the second support shaft 21 are provided on the base 20 of the shutter 11, and the base 20 is fixed to the second lens frame 12, but is directly formed on the second lens frame 12. Or you may attach as another member.

In the lens barrel 2, the lead screw shaft (lens drive mechanism) 7, the rotary actuator (particularly the drive source 27), and the optical path 18 are arranged side by side in the long side direction of the housing 4, thereby providing the second The casing 4 can be thinned without increasing the dimension of the ball frame 12 in the short side direction of the casing 4.

FIG. 6 shows the configuration of the second lens frame 12a of the digital camera module (imaging device) according to the second embodiment of the present invention. About this embodiment, the same code | symbol is attached | subjected to the same component as 1st Embodiment, and the overlapping description is abbreviate | omitted. The second lens frame 12a is provided in parallel with the first support shaft 20 at a position farther from the first support shaft 20 than the optical path (opening) 18 (on the opposite side of the optical path 18 as viewed from the first support shaft 20). A third light shielding blade 37 having a support shaft 34 and pivotally supported by the third support shaft 34 and having a relief hole 35 through which the first support shaft 20 penetrates in a non-contact manner and a cam groove 36 that engages with the drive pin 23 is provided. Have.

FIG. 7 shows the positional relationship when the first light-shielding blade 25, the second light-shielding blade 26, and the third light-shielding blade 37 are in the retracted position that opens the optical path 18, and FIG. The positional relationship when the light shielding blade 26 and the third light shielding blade 37 are in the light shielding position for shielding the optical path 18 is shown. In the present embodiment, the first light shielding blade 25 shields the center of the optical path 18, and the second light shielding blade 26 and the third light shielding blade 37 shield both sides of the first light shielding blade 25. By having the third light shielding blade 37, the width of the first light shielding blade 25 and the second light shielding blade 26 can be reduced, and the cross-sectional area of the lens barrel 2 can be reduced.

The third light shielding blade 37 extends so as to substantially overlap the first light shielding blade 25 at the retracted position, and, like the first light shielding blade 25, the second support shaft 21 and the spacer portion 16a are disposed on the outer side end. A notch 38 is provided for receiving. For this reason, also in this embodiment, the clearance gap between the 1st light-shielding blade 25 and the 3rd light-shielding blade 37 and the housing | casing 4 is small. Thereby, the dimension of the short side direction of the housing | casing 4 can be shortened.

In the present embodiment, the third light shielding blade 37 may have a smaller swing angle than the first light shielding blade 25, so that the third light shielding blade 37 is located farther from the optical path 18 than the first support shaft 25 (outside the rotor 24). Even if the support shaft 34 is arranged, a sufficient swing angle is obtained.

9 and 10 show a main part of the configuration of the ball frame according to the third embodiment of the present invention. In the present embodiment, the first support shaft 20 that pivotally supports the first light shielding blade 25 is provided separately from the central shaft 39 of the rotation of the rotor 24 of the rotary actuator. For this reason, the first light shielding blade 25 has a cam groove 40 that engages with the drive pin 23 and swings about the first support shaft 20 by the swing of the drive pin 23.

When the first support shaft 20 is separated from the central shaft 39 of the rotor 24 as in the present embodiment, the first support shaft 20 is disposed in the vicinity of the central shaft 39 so that the drive pin 23 swings. The first light shielding blade 25 can be swung sufficiently large.

Also in this embodiment, the notch 29 which receives the 2nd spindle 21 and the spacer part 16a can be formed in the 1st light-shielding blade 25 similarly to the above-mentioned embodiment.

Further, FIG. 11 shows a camera-equipped mobile phone 41 as an example of a portable electronic device having the digital camera module 1 which is the imaging apparatus of the present invention. FIG. 11A is a front view of the camera-equipped mobile phone 41, and FIG. 11B is a rear view of the camera-equipped mobile phone 41. In this example, the digital camera module 1 is built in the back side of the camera-equipped mobile phone 41. As in this example, according to the present invention, it is possible to provide a thin portable electronic device having a high-function camera function including optical zoom and autofocus.

1. Imaging device (digital camera module)
2 ... Lens barrel 7 ... Lead screw shaft (lens drive mechanism)
DESCRIPTION OF SYMBOLS 9 ... 2nd lens group 10 ... 3rd lens group 11 ...

Shutter

12, 12a ... 2nd ball frame 16 ... (16a, 16b, 16c) Spacer part 18 ... Opening (optical path)
DESCRIPTION OF SYMBOLS 20 ... 1st spindle 21 ... 2nd spindle 22 ... Base 23 ... Drive pin 24 ... Rotor 25 ... 1st light shielding blade 26 ... 2nd light shielding blade 29 ... Notch 30 ... Cam groove 34 ... 3rd shaft 37 ... Third light shielding blade 39 ... central axis 40 ... cam groove 41 ... mobile phone (portable electronic device)

Claims

A lens frame for holding a plurality of lenses and a shutter disposed between the plurality of lenses on an optical path;
A plurality of spacer portions that are discretely disposed outside the optical path and define a distance between the plurality of lenses sandwiching the shutter.
The shutter is
A rotary actuator that is arranged outside the optical path and swings around a central axis parallel to the optical axis, a drive pin extending parallel to the optical axis of the optical path;
A light shielding position that is pivotally supported by a first support shaft provided in parallel with the optical axis in the vicinity of the central axis of the rotary actuator and can block at least a part of the optical path by the drive pin, and the optical path is opened. A first light-shielding blade that swings between the retracted position and
A cam groove that is pivotally supported by a second support shaft provided in parallel with the first support shaft and engages with the drive pin is provided, and the first light shielding blade is in the light shielding position by swinging of the drive pin. A second light-shielding blade that blocks at least a part of the optical path;
The first light-shielding blade includes at least a part of the second support shaft at a part of the side that is far from the optical path at the retracted position, the distance from the first support shaft being closer to the optical path, and a plurality of A lens barrel having a notch for receiving at least a part of one of the spacer portions.
2. The lens barrel according to claim 1, wherein the spacer portion received in the notch is disposed closer to the first support shaft than to the second support shaft.
3. The lens barrel according to claim 1, wherein the second light shielding blade swings in the direction opposite to the first light shielding blade.
The lens barrel according to any one of claims 1 to 3, wherein the spacer portion is formed integrally with the lens frame.
At least one of the plurality of lenses is held on the ball frame via an auxiliary frame,
The said spacer part is integrally formed in the said ball frame or the said auxiliary | assistant frame, The said ball | bowl frame and the said auxiliary | assistant frame are contact | abutting to any one of Claim 1 to 3 characterized by the above-mentioned. The lens barrel described.
6. The lens barrel according to claim 5, wherein the auxiliary frame is formed integrally with the lens held by the ball frame via the auxiliary frame.
The lens barrel according to any one of claims 1 to 6, wherein the drive pin is eccentric from the first support shaft toward the optical path.
The shutter is pivotally supported by a third support shaft provided at a position farther from the optical path than the first support shaft, and is provided with a cam groove that engages with the drive pin. 8. The lens barrel according to claim 1, further comprising a third light shielding blade that shields at least a part of the optical path when the light shielding blade is in the light shielding position. 9.
The lens barrel according to any one of claims 1 to 8, wherein the first support shaft and a central axis of the rotary actuator are the same.
Furthermore, a cross section perpendicular to the optical axis has a substantially rectangular housing,
10. The lens barrel according to claim 1, wherein the first light shielding blade extends substantially parallel to a long side of the housing at the retracted position.
A lens driving mechanism for moving the lens frame in the optical axis direction;
The lens barrel according to claim 1, wherein the rotary actuator is disposed between the optical path and the lens driving mechanism.
An imaging apparatus comprising the lens barrel according to any one of claims 1 to 11.
A portable electronic device comprising the imaging device according to claim 12.