JP7005321B2 - Lens device, image pickup device, and manufacturing method of lens device - Google Patents

Description

The present invention relates to a lens device, an image pickup device, and a method for manufacturing a lens device capable of adjusting the position of a lens in the optical axis direction.

In the process of assembling a lens device, generally, the lens is moved in the optical axis direction to adjust the position of the lens. Patent Document 1 has a support frame that supports the lens holding frame, and the contact portion of the support frame with the lens holding frame is displaced in the optical axis direction, so that the lens holding frame is rotated with respect to the support frame. Therefore, a lens adjusting mechanism for adjusting the position of the lens holding frame in the optical axis direction is disclosed. Patent Document 2 includes a support frame provided with a lens holding frame and a guide groove, and an engaging member that engages with the guide groove and is attached to the lens holding frame by relative rotation of the lens holding frame and the support frame. A lens barrel that adjusts the position in the optical axis direction is disclosed.

Japanese Unexamined Patent Publication No. 2005-49599 Japanese Unexamined Patent Publication No. 2010-32892

In the lens position adjusting mechanism disclosed in Patent Document 1 and Patent Document 2, a lens holding frame is provided on the outer diameter side of the lens, and a support frame is further provided on the outer diameter side of the lens holding frame. With such a structure, the size of the lens barrel in the radial direction becomes large.

On the other hand, conventionally, a method of laying an adjusting member such as a spacer on the contact surface of the lens and selecting the thickness of the adjusting member to adjust the position of the lens in the optical axis direction is known. However, such a method is complicated because the work of inserting and removing the lens is required.

Therefore, an object of the present invention is to provide a lens device, an image pickup device, and a method for manufacturing a lens device, which are compact and can easily adjust the position of a lens.

The lens device as one aspect of the present invention includes a lens, an adjusting ring that abuts on the lens, and a holding frame that is fitted to each of the lens and the adjusting ring and holds the lens and the adjusting ring. The holding frame has an abutting surface that abuts on the adjusting ring, the adjusting ring has an abutting surface that abuts on the holding frame, and the abutting surface of the holding frame and the adjusting ring. At least one of the abutting surface and the abutting surface is a surface that is displaced in the optical axis direction, and the holding frame has at least one hole portion that penetrates in the radial direction at a position overlapping the adjusting ring in the direction orthogonal to the optical axis. It is formed .

The image pickup device as another aspect of the present invention includes the lens device and an image pickup element that photoelectrically converts an optical image formed via the lens device.

The method for manufacturing a lens device as another aspect of the present invention includes a step of incorporating the adjusting ring into the holding frame, a step of incorporating the adjusting ring into the holding frame, and then a step of inserting the lens into the holding frame. After inserting the lens into the holding frame, the holding frame has a step of adjusting the position of the lens in the optical axis direction, the holding frame has a contact surface that abuts on the adjusting ring, and the adjusting ring has a contact surface. The holding frame has a contact surface that abuts on the holding frame, and at least one of the contact surface of the holding frame and the contact surface of the adjusting ring is a surface that is displaced in the optical axis direction. At least one hole portion penetrating in the radial direction is formed at a position overlapping the adjustment ring in the direction perpendicular to the optical axis .

Other objects and features of the present invention will be described in the following embodiments.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a lens device, an image pickup device, and a method for manufacturing a lens device, which are compact and can easily adjust the position of a lens.

It is sectional drawing of the lens apparatus in 1st Embodiment. It is a side view of the lens apparatus in 1st Embodiment. It is a block diagram of the main part of the lens apparatus in 1st Embodiment. It is a block diagram of the main part of the lens apparatus in 2nd Embodiment. It is a block diagram of the image pickup apparatus in 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment)
First, the lens apparatus according to the first embodiment of the present invention will be described with reference to FIG. 1 or FIG. 1 is a cross-sectional view of the lens device (lens lens barrel) 100 in the present embodiment, FIG. 1 (a) shows an overall view of the lens device 100, and FIG. 1 (b) is shown in FIG. 1 (a). The enlarged view of the broken line part A is shown. 2A and 2B are side views of the lens apparatus 100, FIG. 2A shows an overall view of the lens apparatus 100, and FIG. 2B shows an enlarged view of a broken line portion B in FIG. 2A. There is.

The lens device 100 has a first lens L1 and a second lens L2, and can adjust the position of the first lens L1 along the optical axis OA (optical axis direction) with respect to the second lens L2. Is. Hereinafter, the lens device 100 will be described in detail in the order of assembly.

First, the second lens L2 is inserted into the lens holding frame (holding frame) 10. The second lens L2 is in contact with and fitted to the lens holding frame 10, and the position of the second lens L2 is determined by the lens holding frame 10. After that, the second lens holding ring 20 is incorporated into the lens holding frame 10. The second lens holding ring 20 has a surface that abuts on the second lens L2 and a screw portion that is screwed with the screw portion 10a provided on the lens holding frame 10. By tightening the second lens holding ring 20, the second lens L2 is fixed to the lens holding frame 10.

Subsequently, the connecting member 30 is incorporated into the lens holding frame 10. The lens holding frame 10 is formed with a hole portion 10b that penetrates the first lens L1 in the radial direction. The hole portion 10b is configured to penetrate in the radial direction at a position where it overlaps with the adjusting ring 50 in the direction orthogonal to the optical axis OA (the direction orthogonal to the optical axis). In the present embodiment, a plurality of holes are formed as the holes 10b, but the present invention is not limited to this, and at least one hole may be formed. The connecting member 30 has a protrusion 30a that engages with one of the plurality of holes 10b, and further abuts on the inner peripheral surface 10f of the lens holding frame 10. When assembling the connecting member 30 into the lens holding frame 10, the connecting member 30 is first inserted inside the lens holding frame 10, and the protrusion 30a is engaged with one of the plurality of holes 10b. As shown in FIG. 1B, the protrusion 30a of the connecting member 30 penetrates the hole 10b of the lens holding frame 10 and protrudes to the outside (outer peripheral surface 10g side) of the lens holding frame 10. Further, the connecting member 30 has a screw hole 30b, and the screw hole 30b is accessible via the hole portion 10b of the lens holding frame 10. With such a configuration, the connecting member 30 is pulled in from the outer peripheral surface 10g side of the lens holding frame 10 by using the screw 40, and is temporarily fixed to the lens holding frame 10.

After incorporating the connecting member 30 into the lens holding frame 10, the adjusting ring 50 is incorporated into the lens holding frame 10. The adjusting ring 50 is formed with an engaging groove 50a that engages with the connecting member 30. With such a configuration, the connecting member 30 is connected to the adjusting ring 50 via the hole portion 10b. The phase of the engaging groove 50a of the adjusting ring 50 is aligned with the connecting member 30, and the adjusting ring 50 is inserted into the lens holding frame 10. The adjusting ring 50 is diameter-fitted with the lens holding frame 10. Further, the adjusting ring 50 has a contact surface 50b that abuts on the lens holding frame 10 (see FIG. 3A).

After incorporating the adjusting ring 50 into the lens holding frame 10, the first lens L1 is inserted into the lens holding frame 10. The first lens L1 is diameter-fitted with the lens holding frame 10 and abuts on the adjusting ring 50. After inserting the first lens L1 into the lens holding frame 10, the position of the first lens L1 with respect to the second lens L2 in the optical axis direction is adjusted. After that, the first lens holding ring 60 is incorporated into the lens holding frame 10. The first lens pressing ring 60 has a contact surface 60a that abuts on the first lens L1 and a screw portion 60b that is screwed with a screw portion 10c provided on the lens holding frame 10. The first lens L1 is fixed to the lens holding frame 10 by tightening.

Next, with reference to FIG. 3, a method for adjusting the position of the first lens L1 with respect to the second lens L2 in the optical axis direction will be described in detail. 3A and 3B are structural views of a main part of the lens device, FIG. 3A shows a side view of the adjustment ring 50, and FIG. 3B is a front view of the lens holding frame 10 as viewed from the first lens L1 side. Is. As shown in FIG. 3A, the plurality of contact surfaces 50b of the adjusting ring 50 are slopes displaced in the optical axis direction. The contact surface 50b of the adjusting ring 50 abuts on each of the plurality of contact surfaces 10d of the lens holding frame 10 shown in FIG. 3 (b). The contact surface 10d of the lens holding frame 10 is a slope displaced in the optical axis direction, similarly to the contact surface 50b of the adjusting ring 50. With such a configuration, when the adjusting ring 50 is rotated with respect to the lens holding frame 10, the adjusting ring 50 moves in the optical axis direction. Therefore, the adjusting ring 50 can displace the first lens L1 in the optical axis direction by rotating around the optical axis. In the present embodiment, the contact surface 10d of the lens holding frame 10 is a slope having the same inclination as the contact surface 50b of the adjusting ring 50, but is not limited thereto. In the present embodiment, at least one of the contact surface 10d of the lens holding frame 10 and the contact surface 50b of the adjusting ring 50 may be a slope displaced in the optical axis direction.

The position adjustment of the first lens L1 in the optical axis direction is performed in a state where the first lens pressing ring 60 is not present (a state in which the first lens pressing ring 60 is not in contact with the first lens L1). Further, the position adjustment is performed so that the first lens L1 is on the upper side and the second lens L2 is on the lower side as shown in FIG. In such a state, the lens device 100 is installed in the optical adjuster, and the first lens L1 is moved in the optical axis direction to a position where desired optical performance can be obtained. As described above, the adjusting ring 50 engages with the connecting member 30, and the connecting member 30 has a protrusion 30a that penetrates the hole 10b of the lens holding frame 10 and projects to the outer peripheral surface 10g. By holding the protrusion 30a and rotating the connecting member 30 around the optical axis, the adjusting ring 50 and the first lens L1 are displaced in the optical axis direction. Since the adjusting ring 50 is configured to rotate in conjunction with the rotation of the connecting member 30, the position of the first lens L1 in the optical axis direction can be adjusted.

According to the present embodiment, the position of the first lens L1 in the optical axis direction can be directly and easily adjusted with respect to the lens holding frame 10 that holds the first lens L1. Further, in the configuration of the present embodiment, the lens holding frame 10 is the only component required on the outer peripheral side of the first lens L1, and the lens device is compared with the conventional configuration in which another component is required in addition to the lens holding frame. It is possible to reduce the size of 100 in the radial direction. Further, since the position of the first lens L1 in the optical axis direction can be adjusted by rotating the connecting member 30 around the optical axis from the outside of the lens device 100, the position adjustment is easy (excellent in workability). .. Further, the first lens L1 has a protrusion (not shown) protruding in the radial direction, and engages with the groove portion 10e of the lens holding frame 10. Therefore, even if the adjusting ring 50 rotates around the optical axis, the first lens L1 moves (advances and retreats) in the optical axis direction without rotating. That is, the groove portion 10e is a rotation regulating portion that regulates the rotation of the first lens L1 around the optical axis. As a result, the position can be adjusted without considering the influence of aberration due to the axial deviation of the lens surfaces (R1 surface and R2 surface) of the first lens L1.

After adjusting the position of the first lens L1 in the optical axis direction, the first lens holding ring 60 is tightened to the lens holding frame 10, and the contact surface 60a of the first lens holding ring 60 is brought into contact with the first lens L1. The first lens L1 is fixed to the lens holding frame 10. The slope of the contact surface 10d of the lens holding frame 10 and the contact surface 50b of the adjustment ring 50 rotates the adjustment ring 50 clockwise when viewed from the first lens L1 (upper side of FIG. 1A) in the optical axis direction. Then, the first lens L1 is tilted with respect to the optical axis direction so as to move upward in FIG. 1 (a). As a result, when the first lens holding ring 60 is tightened, the adjusting ring 50 does not rotate unexpectedly, and it becomes possible to fix it more firmly.

After that, by filling the hole portion 10b of the lens holding frame 10 with an adhesive, the lens holding frame 10 and the adjusting ring 50 can be more firmly fixed, and unexpected rotation of the adjusting ring 50 due to an impact or the like can be suppressed. It becomes possible to do. As shown in FIG. 1 (b), the adjusting ring 50 has a fitting length that fits with the lens holding frame 10 all around the front and back of the hole 10b at any position of the lens holding frame 10. Therefore, when viewed in the radial direction from the optical axis OA, the hole portion (at least one hole) 10b formed in the lens holding frame 10 is closed (covered) by the adjusting ring 50. This makes it possible to prevent dust and the like from entering the inside of the lens holding frame 10 from the hole portion 10b.

(Second Embodiment)
Next, the lens apparatus according to the second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a side view of the adjusting ring 50. In the present embodiment, the contact surface 50b of the adjustment ring 50 is a surface (planar surface) displaced stepwise in the optical axis direction, and the contact surface 10d of the lens holding frame 10 and the contact surface 50b of the adjustment ring 50 are formed. Is different from the first embodiment, which is a slope displaced in the optical axis direction. Further, in the present embodiment, the contact surface 10d of the lens holding frame 10 is a plane orthogonal to the optical axis OA. In this embodiment, the same elements as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The present embodiment also has the same effect as that of the first embodiment.

(Third Embodiment)
Next, the image pickup apparatus according to the third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a configuration diagram of an image pickup device 200 (single-lens reflex camera). In FIG. 5, the lens device 100 (interchangeable lens) has an imaging optical system 1 (lens unit). The camera body 120 (imaging device main body, camera main body) is configured to include a quick return mirror 3, a focal plate 4, a pentadach prism 5, an eyepiece lens 6, and the like. The quick return mirror 3 reflects the light flux formed through the image pickup optical system 1 upward. The focal plate 4 is arranged at an image forming position of the image pickup optical system 1. The Pentadaha prism 5 converts an inverted image formed on the focal plate 4 into an upright image. The user can observe the erect image through the eyepiece 6.

The image pickup element 7 includes a CCD sensor and a CMOS sensor, and photoelectrically converts an optical image (subject image) formed via the image pickup optical system 1 to output image data. At the time of shooting, the quick return mirror 3 retracts from the optical path, and an optical image is formed on the image pickup device 7 via the image pickup optical system 1. The control unit 110 has a CPU and controls the operation of each unit of the image pickup apparatus 200.

The image pickup device 200 is composed of a camera body 120 having an image pickup element 7 and a lens device 100 detachably attached to the camera body 120, but the image pickup device 200 is not limited thereto. An image pickup device in which a camera body and a lens device are integrally configured may be used, or a mirrorless single-lens reflex camera (mirrorless camera) without a quick return mirror may be used.

According to each embodiment, it is possible to provide a lens device, an image pickup device, and a method for manufacturing the lens device, which are small and can easily adjust the position of the lens.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

For example, as an adjustment order, the first lens holding ring 60 was tightened after adjusting the position of the first lens L1 in the optical axis direction, and then the hole portion 10b of the lens holding frame 10 was filled with an adhesive. On the other hand, after adjusting the position of the first lens L1 in the optical axis direction, the hole portion 10b of the lens holding frame 10 is filled with an adhesive, the lens holding frame 10 and the adjusting ring 50 are fixed first, and then the first lens holding frame 10 is fixed. Adjustment may be performed in the order of tightening the lens holding ring 60 and fixing the first lens L1. In this case, even if the first lens L1 and the lens holding frame 10 are not restricted in rotation, the adjusting ring 50 does not rotate when the presser ring 60 is tightened, and the adjusted first lens L1 is in the optical axis direction. Does not fluctuate.

L1 1st lens (lens)
10 Lens holding frame (holding frame)
50 Adjustment ring

Claims (10)

With the lens
The adjustment ring that comes into contact with the lens,
It has a holding frame that fits into each of the lens and the adjustment ring and holds the lens and the adjustment ring.
The holding frame has a contact surface that abuts on the adjusting ring.
The adjusting ring has a contact surface that abuts on the holding frame.
At least one of the contact surface of the holding frame and the contact surface of the adjusting ring is a surface that is displaced in the optical axis direction.
A lens device characterized in that at least one hole portion penetrating in the radial direction is formed in the holding frame at a position overlapping with the adjusting ring in the direction orthogonal to the optical axis . The lens device according to claim 1, wherein the surface displaced in the optical axis direction is a slope inclined with respect to the optical axis direction. The lens device according to claim 1, wherein the surface displaced in the optical axis direction is a surface displaced stepwise in the optical axis direction. The lens device according to any one of claims 1 to 3, wherein the adjusting ring is configured to displace the lens in the optical axis direction by rotation around the optical axis. The lens according to any one of claims 1 to 4, further comprising a connecting member that is connected to the adjusting ring via the at least one hole portion and that protrudes in the radial direction. Device. The lens device according to claim 5 , wherein the adjusting ring is configured to rotate in conjunction with the rotation of the connecting member. One of claims 1 to 6 , wherein the at least one hole formed in the holding frame is covered with the adjusting ring when viewed in the radial direction from the optical axis. The lens device described in. The lens device according to any one of claims 1 to 7 , further comprising a rotation regulating unit that regulates the rotation of the lens around the optical axis. The lens device according to any one of claims 1 to 8 .
An image pickup device comprising a camera body that holds an image pickup element that photoelectrically converts an optical image formed via the lens device. The step of incorporating the adjustment ring into the holding frame and
After incorporating the adjusting ring into the holding frame, the step of inserting the lens into the holding frame and
After inserting the lens into the holding frame, it has a step of adjusting the position of the lens in the optical axis direction.
The holding frame has a contact surface that abuts on the adjusting ring.
The adjusting ring has a contact surface that abuts on the holding frame.
At least one of the contact surface of the holding frame and the contact surface of the adjusting ring is a surface that is displaced in the optical axis direction.
A method for manufacturing a lens device, characterized in that the holding frame is formed with at least one hole portion that penetrates in the radial direction at a position overlapping the adjustment ring in the direction orthogonal to the optical axis .

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