Lens device and imaging device
By using a base member and an independent driving unit to adjust the focus position of the optical system in the three-dimensional imaging lens device, the complexity of focus and focus position offset in the prior art is solved, and the compact design and high-precision adjustment of the lens device are realized.
Patent Information
- Application Number
- CN202510018881.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-01-10
- Filing Date
- 2025-01-07
- Publication Date
- 2025-07-11
AI Technical Summary
In the existing three-dimensional imaging lens devices, the focus adjustment and focus position offset adjustment of the two optical systems are complex, resulting in a large size and difficult to achieve a compact design.
The base member is used to maintain the two optical systems, and the focus position of the optical system is adjusted separately through independent focus and focus difference adjustment driving units. The lens holding cylinder is fixed with an eccentric roller and screw, and lightweight driving is achieved in combination with a flexible printed circuit to reduce the size of the lens device.
The compact design of the lens device is realized, reducing the driving load and device size, while improving the accuracy of focus and focus difference adjustment.
Smart Images
Figure CN120294940A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a lens device and an image pickup device. Background Art
[0002] Interchangeable lenses for three-dimensional imaging have been conventionally known. In a lens device including two optical systems arranged side by side and configured to form two image circles side by side on a single image sensor, focusing is to be performed on each of the two optical systems in order to capture images having parallax. Japanese Patent Application Laid-Open No. 2023-37539 discloses a lens device including a first focusing unit configured to simultaneously perform focusing on a first optical system and a second optical system, and a second focusing unit configured to adjust a relative focal position shift between the first optical system and the second optical system. The first focusing unit is connected to both the first optical system and the second optical system, while the second focusing unit is connected to one of the first optical system and the second optical system. Summary of the Invention
[0003] A lens device according to an aspect of the present disclosure includes: a first optical system; a second optical system arranged side by side with the first optical system; a base member configured to movably hold the first optical system and the second optical system in an optical axis direction; a first driving unit configured to move the base member in the optical axis direction; a first holder configured to hold a part of a plurality of lenses constituting the second optical system; and a second driving unit configured to move the first holder in the optical axis direction. An image pickup device having the above lens device also constitutes another aspect of the present disclosure.
[0004] Further features of various embodiments of the present disclosure will become apparent from the following description of embodiments with reference to the accompanying drawings. Brief Description of the Drawings
[0005] Figure 1 is a perspective view of an image pickup device according to a first embodiment.
[0006] Figure 2 is an exploded perspective view of a lens unit according to a first embodiment.
[0007] Figure 3 is a front view of a lens unit according to a first embodiment.
[0008] Figure 4 is a side view of a lens unit according to a first embodiment.
[0009] Figure 5 is a front view of a lens unit according to a second embodiment.
[0010] Figure 6 is a side view of a lens unit according to the second embodiment.
[0011] Figure 7 is a front view of a lens unit according to the third embodiment.
[0012] Figure 8 is a side view of a lens unit according to the third embodiment. DETAILED DESCRIPTION
[0013] Now, with reference to the accompanying drawings, a detailed description of embodiments according to the present disclosure will be given.
[0014] First Embodiment
[0015] Now, with reference to Figures 1 to 4 , a description of the first embodiment of the present disclosure will be given. Figure 1 is a perspective view of an imaging device 10 according to the present embodiment. The imaging device 10 includes a camera body 200 and a lens device (interchangeable lens) 100 that can be attached to and detached from the camera body 200. However, the present embodiment is not limited to this example and is applicable to an imaging device in which the camera body and the lens device are integrated.
[0016] The lens device 100 can be attached to and detached from the camera body 200 via a bracket (not shown). The lens device 100 includes a lens unit 101, a control unit (not shown), a lens drive instruction unit, and a contact unit that can communicate with the camera body 200. The camera body 200 includes an image sensor 201 such as a CMOS sensor, a control unit (not shown), and a contact unit that can communicate with the lens device 100. The image sensor 201 is a single image sensor that performs photoelectric conversion on each of a first optical image formed by a first optical system and a second optical image formed by a second optical system arranged in parallel with the first optical system.
[0017] Figure 2is an exploded perspective view of the lens unit 101 according to the present embodiment. The lens unit 101 includes a first optical system and a second optical system arranged in parallel with the first optical system. The first optical system includes a plurality of lenses, and the plurality of lenses include a first lens 301, a second lens 302, and a third lens 306, which are arranged in this order from the object side to the image side along the direction of the first optical axis 300. The first optical system is a coaxial optical system because the central axes of all the lenses constituting the first optical system are the first optical axis 300. The second optical system includes a plurality of lenses, and the plurality of lenses include a first lens 401, a second lens 402, and a third lens 406, which are arranged in this order from the object side to the image side along the direction of the second optical axis 400. Similar to the first optical system, the second optical system is also a coaxial optical system because the central axes of all the lenses constituting the second optical system are the second optical axis 400.
[0018] The first lens holding cylinder 102 holds the first lens 301 of the first optical system and the first lens 401 of the second optical system. The second lens holding cylinder (second holder) 303 holds the second lens 302 of the first optical system. The second lens holding cylinder (third holder) 403 holds the second lens 402 of the second optical system. That is, the second lens holding cylinder 303 holds at least a part of the lenses of the first optical system, and the second lens holding cylinder 403 is arranged in parallel with the second lens holding cylinder 303 and holds at least a part of the lenses of the second optical system.
[0019] The second lens holding cylinder 303 is fixed to the groove portion 102a in the first lens holding cylinder 102 using a roller 304 and a screw 305, and its position is determined. The roller 304 is an eccentric roller (second position regulator) configured to adjust and determine the position of the second lens holding cylinder 303. Similarly, the second lens holding cylinder 403 is fixed to the first lens holding cylinder 102 using a roller 404 and a screw 405, and its position is determined. The roller 404 is an eccentric roller (third position regulator) configured to adjust and determine the position of the second lens holding cylinder 403.
[0020] The third lens holding cylinder 307 holds the third lens 306 in the first optical system. The third lens holding cylinder (first holder) 407 holds the third lens 406 in the second optical system. That is, the third lens holding cylinder 407 holds a part of the plurality of lenses in the second optical system. The third lens holding cylinder 307 is fixed to the base member (main base) 103 using a screw 308, and its position is determined.
[0021] The third lens holding cylinder 407 is a regulator configured to adjust the focal difference (relative focal position shift between the first optical system and the second optical system) between the first optical system and the second optical system.
[0022] The third lens holder 407 can be moved back and forth in the direction along the second optical axis 400 (optical axis direction) by the guide rod 408 sandwiched between the first lens holder 102 and the base member 103 and the focus difference adjustment drive unit (second drive unit) 409. Therefore, the focus difference adjustment drive unit 409 moves the third lens holder 407 in the optical axis direction. The focus difference adjustment drive unit 409 is electrically connected to a fixed substrate (not shown) through a flexible printed circuit (not shown). The focus difference adjustment drive unit 409 drives the third lens holder 407 (only a part of all the lenses constituting the second optical system) to adjust the focus difference (relative focus position shift between the first optical system and the second optical system) between the first optical system and the second optical system (perform focus difference adjustment). Therefore, the driving load is light, and the size of the driving actuator can be reduced. As a result, the size of the lens device 100 can be reduced.
[0023] Since the third lens holder 307 is a fixed unit, the focus difference adjustment accuracy is higher than that in the configuration where the third lens holder 307 is a focusing unit similar to the third lens holder 407. The first lens holder 102 is fixed to the base member 103 by screws 104 to determine its position. The cam follower 103a of the base member 103 is inserted into the linear groove 105a in the guide tube 105 and the cam groove 106a in the cam ring 106. Due to the rotation of the cam ring 106, the first lens holder 102 can be moved back and forth in the direction along the first optical axis 300 and the second optical axis 400 (optical axis direction). The rotation range of the cam ring 106 is limited by the screw 107.
[0024] The focusing drive unit (first drive unit) 108 includes a drive source 109 and a transmission unit 110, and is fixed to the guide tube 105 by screws (not shown). The focusing drive unit 108 is electrically connected to a fixed substrate (not shown) through a flexible printed circuit (not shown). The rotation of the drive source 109 causes the cam ring 106 to rotate via the transmission unit 110, and moves the base member 103 back and forth in the direction along the first optical axis 300 and the second optical axis 400 (optical axis direction). Therefore, the focusing drive unit 108 moves the base member 103 in the optical axis direction, thereby simultaneously performing focusing of the first optical system and the second optical system.
[0025] Figure 3 It is a front view of the lens unit 101 according to the present embodiment as viewed from the direction along the first optical axis 300 and the second optical axis 400 (or in a plane orthogonal to the first optical axis 300 and the second optical axis 400). Figure 4It is a side view of the lens unit 101 viewed from a direction perpendicular to each of the first optical axis 300 and the second optical axis 400 (the direction in which the first optical axis 300 and the second optical axis 400 overlap each other). Figure 3 and Figure 4 merely illustrate, respectively, the second lens holding cylinder 303, the roller 304, the screw 305, the second lens holding cylinder 403, the roller 404, the screw 405, the focus difference adjustment drive unit 409, and the focusing drive unit 108 selected from the lens unit 101.
[0026] As Figure 3 shown, when viewing the lens unit 101 (lens device 100) along the optical axis direction, the focus difference adjustment drive unit 409 is arranged at a position avoiding (deviating from) the straight line 500 connecting the first optical axis 300 and the second optical axis 400 (so as not to overlap with the straight line 500). When viewing the lens unit 101 along the optical axis direction, the focus difference adjustment drive unit 409 is arranged at a position avoiding (deviating from) the rollers 304 and 404 (so as not to overlap with the rollers 304 and 404, that is, in a different phase). When viewing the lens unit 101 along the optical axis direction, the drive source 109 of the focusing drive unit 108 is arranged not to overlap with the focus difference adjustment drive unit 409. This arrangement can reduce the size of the lens device 100 in the radial direction.
[0027] As Figure 4 shown, when viewing the lens unit 101 from the direction in which the first optical axis 300 and the second optical axis 400 overlap each other, at least a part of the focusing drive unit 108 and at least a part of the focus difference adjustment drive unit 409 are arranged to overlap with each other at positions along the optical axis direction (or such that they intersect with a straight line perpendicular to the optical axis direction, or they are arranged on a plane perpendicular to the optical axis direction). When viewing the lens unit 101 from the direction in which the first optical axis 300 and the second optical axis 400 overlap each other, at least a part of the focus difference adjustment drive unit 409 and the rollers 304 and 404 are arranged to overlap with each other. This arrangement can reduce the size of the lens device 100 in the entire length direction (optical axis direction).
[0028] Second Embodiment
[0029] Now referring to Figure 5 and Figure 6 , a description of the second embodiment of the present disclosure will be given. Figure 5 is a front view of the lens unit 101 according to this embodiment viewed from the direction along the first optical axis 300 and the second optical axis 400. Figure 6It is a side view of the lens unit 101 viewed from a direction perpendicular to each of the first optical axis 300 and the second optical axis 400 (the direction in which the first optical axis 300 and the second optical axis 400 overlap each other).
[0030] As Figure 5 shown, when the lens unit 101 (lens device 100) is viewed along the optical axis direction, the focus difference adjustment drive unit 409 is arranged at a position avoiding the straight line 500 connecting the first optical axis 300 and the second optical axis 400. The focus difference adjustment drive unit 409 is also arranged at a position overlapping at least a part of the rollers 304 and 404. The drive source 109 of the focus adjustment drive unit 108 is also arranged at a position not overlapping with the focus difference adjustment drive unit 409. This arrangement can reduce the size of the lens device 100 in the radial direction.
[0031] As Figure 6 shown, when the lens unit 101 is viewed from the direction in which the first optical axis 300 and the second optical axis 400 overlap each other, at least a part of the focus difference adjustment drive unit 409 and at least a part of the focus adjustment drive unit 108 are arranged to overlap each other at a position along the optical axis direction (or such that they intersect a straight line perpendicular to the optical axis direction, or they are arranged on a plane perpendicular to the optical axis direction). This arrangement can reduce the size of the lens device 100 in the overall length direction.
[0032] Third Embodiment
[0033] Now referring to Figure 7 and Figure 8 , a description of the third embodiment of the present disclosure will be given. Figure 7 It is a front view of the lens unit 101 according to the present embodiment viewed from the direction along the first optical axis 300 and the second optical axis 400. Figure 8 It is a side view of the lens unit 101 viewed from a direction perpendicular to each of the first optical axis 300 and the second optical axis 400 (the direction in which the first optical axis 300 and the second optical axis 400 overlap each other).
[0034] As Figure 7 shown, when the lens unit 101 (lens device 100) is viewed along the optical axis direction, the focus difference adjustment drive unit 409 is arranged at a position avoiding the straight line 500 connecting the first optical axis 300 and the second optical axis 400. When the lens unit 101 is viewed along the optical axis direction, the focus difference adjustment drive unit 409 is arranged at a position not overlapping with the rollers 304 and 404. The drive source 109 of the focus adjustment drive unit 108 is arranged at a position not overlapping with the focus difference adjustment drive unit 409. This arrangement can reduce the radial size of the lens device 100.
[0035] AsFigure 8 As shown, when the lens unit 101 is viewed in the direction in which the first optical axis 300 and the second optical axis 400 overlap each other, at least a part of the focus difference adjustment drive unit 409 and at least a part of the focusing drive unit 108 are arranged to overlap each other at positions along the optical axis direction (or such that they intersect a straight line perpendicular to the optical axis direction, or they are arranged on a plane perpendicular to the optical axis direction). When the lens unit 101 is viewed in the direction in which the first optical axis 300 and the second optical axis 400 overlap each other, the focus difference adjustment drive unit 409 and the rollers 304 and 404 are arranged to at least partially overlap each other. This arrangement can reduce the size of the lens device 100 in the entire length direction.
[0036] Although the present disclosure describes example embodiments, it should be understood that the present disclosure is not limited to the example embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all such modifications as well as equivalent structures and functions.
[0037] Each embodiment can provide a lens device having a reduced size.
Claims
1. A lens device, characterized in that, The lens device includes: A first optical system; A second optical system arranged in parallel with the first optical system; A base member configured to movably hold the first optical system and the second optical system in the optical axis direction; A first driving unit configured to move the base member in the optical axis direction; A first holder configured to hold a part of a plurality of lenses constituting the second optical system; and A second driving unit configured to move the first holder in the optical axis direction.
2. The lens device according to claim 1, wherein When viewing the lens device along the optical axis direction, the second driving unit is arranged not to overlap with a straight line connecting a first optical axis of the first optical system and a second optical axis of the second optical system, and the first driving unit is arranged not to overlap with the second driving unit.
3. The lens device according to claim 1, characterized in that, When viewing the lens device along a direction perpendicular to a first optical axis of the first optical system and a second optical axis of the second optical system and in which the first optical axis and the second optical axis overlap with each other, at least a part of the first driving unit and at least a part of the second driving unit overlap with each other at positions along the optical axis direction.
4. The lens device according to claim 1, wherein, Each of the first optical system and the second optical system is a coaxial optical system.
5. The lens device according to claim 1, characterized in that, The first driving unit includes a driving source and a transmission unit, wherein when viewing the lens device along the optical axis direction, the driving source is arranged not to overlap with the second driving unit.
6. The lens device according to claim 1, wherein The first driving unit moves the base member in the optical axis direction to simultaneously perform focusing of the first optical system and the second optical system, wherein the second driving unit moves the part of the plurality of lenses constituting the second optical system in the optical axis direction to perform a focus difference adjustment for adjusting an offset of a relative focal position between the first optical system and the second optical system.
7. The lens device according to any one of claims 1 to 6, further comprising: A second holder configured to hold at least a part of a lens of the first optical system; And A third holder arranged in parallel with the second holder and configured to hold at least a part of a lens of the second optical system, characterized in that the second holder includes a second position adjuster configured to adjust the position of the second holder, wherein the third holder includes a third position adjuster configured to adjust the position of the third holder.
8. The lens device according to claim 7, characterized in that, When viewing the lens device along a direction perpendicular to each of a first optical axis of the first optical system and a second optical axis of the second optical system and in which the first optical axis and the second optical axis overlap with each other, the second driving unit is arranged to overlap with each of the second position adjuster and the third position adjuster, wherein when viewing the lens device along the optical axis direction, the second driving unit is arranged not to overlap with each of the second position adjuster and the third position adjuster.
9. The lens device according to claim 7, wherein The second position adjuster is configured to adjust and determine the position of the second holder, wherein the third position adjuster is configured to adjust and determine the position of the third holder.
10. An imaging device, characterized in that, The imaging device includes: The lens device according to any one of claims 1 to 9; and An image sensor.
11. The imaging device according to claim 10, wherein the image sensor is a single image sensor configured to perform photoelectric conversion on a first optical image formed by a first optical system and a second optical image formed by a second optical system.