Lens barrel and image capturing device
Provided is a lens barrel including a subject-side lens guided by guide bars, comprising a first guide shaft that is disposed within a cylindrical fixed cylinder and oriented along an axial direction of the fixed cylinder; a second guide shaft that is disposed outside the fixed cylinder and oriented along the axial direction, and arranged such that at least a portion thereof overlaps with the first guide shaft in a longitudinal direction of the first guide shaft; a first holding member that holds a first lens, includes a first engaging member that engages with the first guide shaft, and moves along the first guide shaft; and a second holding member that holds a second lens positioned on a subject side of the first lens, includes a second engaging member that engages with the second guide shaft, and moves along the second guide shaft, wherein at least a portion of movement range of the first engaging member on the first guide shaft overlaps in the axial direction with at least a portion of movement range of the second engaging member on the second guide shaft.
1. A lens barrel comprising:
a first guide shaft that is disposed within a cylindrical fixed cylinder and oriented along an axial direction of the fixed cylinder;
a second guide shaft that is disposed outside the fixed cylinder and oriented along the axial direction, and arranged such that at least a portion thereof overlaps with at least a portion of the first guide shaft in a longitudinal direction of the first guide shaft;
a first holding member that holds a first lens, includes a first engaging member that engages with the first guide shaft, and moves along the first guide shaft; and
a second holding member that holds a second lens, includes a second engaging member that engages with the second guide shaft, and moves along the second guide shaft, wherein
at least a portion of movement range of the first engaging member on the first guide shaft overlaps in the axial direction with at least a portion of movement range of the second engaging member on the second guide shaft.
2. The lens barrel according to claim 1 , further comprising a driving member that is arranged between the first guide shaft and the second guide shaft and commonly drives the first holding member and the second holding member.
3. The lens barrel according to claim 2 , wherein
the first holding member includes a first cam follower and the second holding member includes a second cam follower, and
the driving member is a cam cylinder that engages with the fixed cylinder and that includes a first cam groove engaging with the first cam follower and a second cam groove engaging with the second cam follower.
4. The lens barrel according to claim 1 , wherein
length over which the first engaging member engages with the first guide shaft is constant, regardless of a position at which the first engaging member engages with the first guide shaft, and
length over which the second engaging member engages with the second guide shaft is constant, regardless of a position at which the second engaging member engages with the second guide shaft.
5. The lens barrel according to claim 1 , wherein
the first guide shaft and the second guide shaft are fixed to the fixed cylinder at a plurality of locations on the guide shafts.
6. The lens barrel according to claim 1 , wherein
at least one of the first guide shaft and the second guide shaft is a pair of guide shafts oriented in parallel with an axial direction orthogonal to a radial direction of the fixed cylinder.
7. The lens barrel according to claim 1 , wherein
at least one of (i) positions in a direction of an optical axis of the first lens and the first engaging member and (ii) positions in the direction of the optical axis of the second lens and the second engaging member are skewed in the direction of the optical axis.
8. The lens barrel according to claim 7 , wherein
the second lens is arranged further on a subject side than the second engaging member.
9. The lens barrel according to claim 7 , wherein
when the second lens is arranged further on an image side of the first lens than the second engaging member, the first lens is arranged further on the image side than the first engaging member.
10. An image capturing device comprising:
the lens barrel according to claim 1 ; and
an image capturing unit that captures an image using an optical system including the first lens and the second lens.
11. The lens barrel according to claim 1 , wherein
the second lens is positioned on a subject side of the first lens.
12. A method of manufacturing a lens barrel, comprising:
providing a first guide shaft that is disposed within a cylindrical fixed cylinder and oriented along an axial direction of the fixed cylinder;
providing a second guide shaft that is disposed outside the fixed cylinder and oriented along the axial direction, and arranged such that at least a portion thereof overlaps with at least a portion of the first guide shaft in a longitudinal direction of the first guide shaft;
providing a first holding member that holds a first lens, including a first engaging member that engages with the first guide shaft, and moves along the first guide shaft; and
providing a second holding member that holds a second lens, includes a second engaging member that engages with the second guide shaft, and moves along the second guide shaft, wherein
at least a portion of movement range of the first engaging member on the first guide shaft overlaps in the axial direction with at least a portion of movement range of the second engaging member on the second guide shaft.
13. The method of manufacturing according to claim 12 , further comprising providing a driving member that is arranged between the first guide shaft and the second guide shaft and commonly drives the first holding member and the second holding member.
14. The method of manufacturing according to claim 13 , wherein
the first holding member includes a first cam follower and the second holding member includes a second cam follower, and
the driving member is a cam cylinder that engages with the fixed cylinder and that includes a first cam groove engaging with the first cam follower and a second cam groove engaging with the second cam follower.
15. The method of manufacturing according to claim 12 , wherein
length over which the first engaging member engages with the first guide shaft is constant, regardless of a position at which the first engaging member engages with the first guide shaft, and
length over which the second engaging member engages with the second guide shaft is constant, regardless of a position at which the second engaging member engages with the second guide shaft.
16. The method of manufacturing according to claim 12 , wherein
the first guide shaft and the second guide shaft are fixed to the fixed cylinder at a plurality of locations on the guide shafts.
17. The method of manufacturing according to claim 12 , wherein
at least one of the first guide shaft and the second guide shaft is a pair of guide shafts oriented in parallel with an axial direction orthogonal to a radial direction of the fixed cylinder.
18. The method of manufacturing according to claim 12 , wherein
at least one of (i) positions in a direction of an optical axis of the first lens and the first engaging member and (ii) positions in the direction of the optical axis of the second lens and the second engaging member are skewed in the direction of the optical axis.
19. The method of manufacturing according to claim 18 , wherein
the second lens is arranged further on a subject side than the second engaging member.
20. The method of manufacturing according to claim 18 , wherein
when the second lens is arranged further on an image side of the first lens than the second engaging member, the first lens is arranged further on the image side than the first engaging member.
21. A method of manufacturing an image capturing device, comprising:
the method of manufacturing the lens barrel according to claim 12 ; and
providing an image capturing unit that captures an image using an optical system including the first lens and the second lens.
22. The method of manufacturing according to claim 12 , wherein
the second lens is positioned on a subject side of the first lens.