JP6444613B2 - Lens barrel and imaging device - Google Patents

Description

  The present invention relates to a lens barrel incorporating a lens and an imaging apparatus including the lens barrel, and in particular, a lens cylinder member that holds a lens and a lens cylinder member that are screwed together and fixed to a substrate on which an imaging element is mounted. The present invention relates to a lens barrel provided with a base cylinder member and an imaging apparatus.

  As a conventional lens barrel, a lens barrel portion (lens holder) having a lens barrel portion for arranging and holding a plurality of lenses, a male screw portion formed on the outer periphery of the lens barrel portion, and a base barrel for receiving the lens barrel member A base cylinder member (base) having a base flange part formed at the rear end of the base cylinder part, a female screw part formed on the inner periphery of the base cylinder part, The center axis of the base cylinder part and the center of the imaging element (the light receiving part) of the substrate fixed to the base flange part coincide with each other, and the female screw part is coaxial with the center axis of the base cylinder part. The lens tube member is formed so that the center axis of the lens tube portion matches the optical axis of the lens to be incorporated, and the male screw portion is coaxial with the center axis of the lens tube portion. etc The male screw portion of the lens tube member incorporated in advance is screwed to the female screw portion of the base tube member and is fixed to the base tube member by appropriately adjusting the screwing amount (screwing amount). A lens barrel that performs optical axis adjustment (focus adjustment) on the image sensor, and a structure in which a substrate on which the image sensor is mounted is assembled to a base cylinder member (base flange portion) of the lens barrel. An imaging device is known (see, for example, Patent Document 1).

However, in the above-described lens barrel, the lens barrel member is assembled by simply screwing the male threaded portion of the lens barrel member into the female threaded portion of the base tube member, so adjustment in the optical axis direction (focus adjustment) is possible. Even so, there is a manufacturing error (variation) in the dimension between the male screw part and the female screw part, gaps and backlash due to backlash, etc., and the lens cylinder member is attached to the base cylinder member in the state where it is assembled. There is a possibility that the optical axis is tilted (inclination of the optical axis) such that the central axis of the lens cylindrical member (that is, the optical axis of the lens) is inclined with respect to the central axis of the cylindrical member (a vertical line passing through the center of the image sensor). It was.
Therefore, the conventional lens barrel described above is not sufficient in terms of optical axis adjustment (to prevent the optical axis of the lens from collapsing) that aligns the optical axis of the lens with the imaging element (light receiving surface). It was a simple structure.
In addition, since the lens cylinder member and the base cylinder member are provided with through holes (windows) for adjustment by rotating the lens around the optical axis, there is a risk that water droplets or the like may enter from the outside, and the waterproofness is insufficient. Met.

JP 2005-215369 A

  The present invention has been made in view of the circumstances of the prior art described above, and the object of the present invention is to facilitate the assembly while simplifying the structure, reducing the size, reducing the cost, and the like. A lens barrel capable of easily performing optical axis adjustment (preventing tilting of the optical axis, focus adjustment in the optical axis direction, etc.), ensuring waterproofness, and ensuring desired optical characteristics; An imaging device is provided.

The lens barrel of the present invention includes a base tube member having a base tube portion that defines a first central axis serving as a reference, and a lens tube portion that defines a second central axis that holds the lens and matches the optical axis of the lens. And a lens barrel that is assembled to the base cylinder member, the base cylinder member guiding the lens cylinder member so that the second central axis coincides with the first central axis. The lens tube member includes a guided portion that is guided by the guide portion so that the second central axis coincides with the first central axis.
According to this configuration, when the lens barrel member in which the lens is previously incorporated in the lens barrel portion so that the optical axis of the lens coincides with the second central axis of the lens barrel portion, the lens barrel member is assembled. The guided portion is guided by the guide portion of the base cylindrical member, and the second central axis of the lens cylindrical member (the optical axis of the lens) is made to coincide with the first central axis serving as the reference of the base cylindrical member. The inclination of the second central axis (and the optical axis of the lens) with respect to the central axis is prevented.
That is, the first central axis of the base cylinder member, the second central axis of the lens cylinder member, and the optical axis of the lens held by the lens cylinder member all coincide on the same straight line.
As described above, when manufacturing the base cylinder member and the lens cylinder member, it is easy to adjust the entire optical axis simply by controlling the predetermined dimensions, assembling the lens cylinder member incorporating the lens into the base cylinder member, and performing focus adjustment. Thus, it is possible to obtain a lens barrel that is easy to assemble and satisfies desired optical characteristics while achieving simplification, miniaturization, cost reduction, and the like of the structure.

In the above configuration, the base tube member has a first screw portion formed in the base tube portion, the lens tube member has a second screw portion formed in the lens tube portion, It is possible to adopt a configuration in which the two screw portions are screwed to the first screw portion and assembled to the base cylinder member.
According to this configuration, in order to assemble the lens cylinder member in which the lens is previously incorporated in the lens cylinder part so that the optical axis of the lens coincides with the second central axis of the lens cylinder part, When the second screw portion (one of the male screw portion and the female screw portion) is screwed to the first screw portion (the other of the male screw portion and the female screw portion) of the base cylinder member, for example, rattling or the like occurs in the screwing relationship. Even so, the guided portion of the lens tube member is guided by the guide portion of the base tube member, and the second central axis of the lens tube member (the optical axis of the lens) becomes the first central axis serving as the reference of the base tube member. Since they are matched, the inclination of the second central axis (and the optical axis of the lens) with respect to the first central axis is prevented.
That is, the first central axis of the base cylinder member, the second central axis of the lens cylinder member, and the optical axis of the lens held by the lens cylinder member all coincide on the same straight line.
Therefore, in this state, for example, a substrate on which an image sensor for inspection is mounted (the center vertical line of the image sensor is aligned with the first central axis) with respect to the rear end (for example, the base flange portion) of the base cylinder member. As in the above, the lens barrel member is screwed in (amount of screwing of the second screw portion with respect to the first screw portion) as appropriate while checking the image photographed by the image pickup device in the temporarily fixed state. Thus, the focus adjustment in the direction of the optical axis (the direction of the first central axis and the second central axis) can be performed, and after the adjustment, both of them are bonded with an adhesive or the like (for example, an adhesive previously applied to the screw portion) Can be fixed (by natural drying) to prevent misalignment.
As described above, when the base cylinder member and the lens cylinder member are manufactured, the predetermined dimensions are controlled, the lens cylinder member incorporating the lens is screwed into the base cylinder member and assembled, and the entire light is simply adjusted. The lens can be adjusted easily, and a lens barrel that is easy to assemble and satisfies desired optical characteristics can be obtained while achieving simplification, downsizing, cost reduction, and the like of the structure.

In the above configuration, the first screw portion is a female screw portion formed on the inner periphery of the base tube portion, the second screw portion is a male screw portion formed on the outer periphery of the lens tube portion, and the guide portion is It is possible to adopt a configuration that is formed inside the base tube portion and the guided portion is formed outside the lens tube portion.
According to this configuration, the male screw portion formed on the outer periphery of the lens tube member (the lens tube portion) is screwed to the female screw portion formed on the inner periphery of the base tube member (the base tube portion). Can be adjusted easily so that the optical axis can be easily adjusted (focus adjustment). In particular, the lens cylinder member is assembled so as to be fitted inside the base cylinder member. In addition, since no through holes or the like are provided in the outer walls of the base cylinder member and the lens cylinder member, it is possible to prevent water droplets or the like from entering the inside.

In the above configuration, the guide portion is one cylindrical guide portion formed so as to form a cylindrical surface adjacent to the female screw portion on the inner periphery of the base tube portion, and the guided portion is an outer periphery of the lens tube portion. In the configuration, it is possible to adopt a configuration which is one cylindrical guided portion formed so as to form a cylindrical surface adjacent to the male screw portion.
According to this configuration, when the male threaded portion of the lens tube member is screwed into the female threaded portion of the base tube member, the cylindrical guided portion of the lens tube member becomes the base even if there is a backlash or the like in the screwing relationship. Guided over the entire circumference of the cylindrical guide portion of the cylindrical member, the second central axis of the lens cylindrical member (the optical axis of the lens) is made to coincide with the first central axis serving as the reference of the base cylindrical member. The inclination of the second central axis (and the optical axis of the lens) with respect to the central axis is prevented.
Here, as the guide portion and the guided portion, adjacent to the female screw portion (and adjacent to one cylindrical guide portion and male screw portion forming a cylindrical surface (and having a predetermined length in the direction of the first central axis)) 2 In order to employ one cylindrical guided portion having a cylindrical surface with a predetermined length in the direction of the central axis, the base cylindrical member and the lens cylindrical member are arranged in the optical axis direction (the direction of the first central axis and the second central axis). ), The optical axis can be prevented from falling.

In the above configuration, the base tube member has a base flange portion formed at the rear end of the base tube portion, and an optical element assembled between the female screw portion and the base flange portion in the direction of the first central axis. Including configurations can be employed.
According to this configuration, since the optical element (for example, a diaphragm member, an optical filter, etc.) is provided in the base cylinder member, the optical axis can be easily adjusted while achieving a reduction in the size of the lens cylinder member. Desired optical properties can be obtained.

In the above configuration, the guide portion includes a small-diameter guide portion that is formed on the rear side of the female screw portion in the direction of the first central axis and contacts with an inner diameter that is smaller than the inner diameter of the female screw portion. A configuration including a small-diameter guided portion that is formed on the rear side of the male screw portion in the direction of the two central axes and that contacts the small-diameter guide portion with an outer diameter smaller than the outer diameter of the male screw portion can be adopted.
According to this configuration, when the male screw portion of the lens tube member is screwed to the female screw portion of the base tube member, the small-diameter guided portion of the lens tube member is the base even if the screwing relationship is loose. Guided by the small-diameter guide portion of the cylindrical member, the second central axis (lens optical axis) of the lens cylindrical member is made to coincide with the first central axis serving as the reference of the base cylindrical member. The inclination of the central axis (and the optical axis of the lens) is prevented.

In the above configuration, the guide portion includes a large-diameter guide portion that is formed on the front side of the female screw portion in the direction of the first central axis and contacts with an inner diameter that is larger than the inner diameter of the female screw portion. Adopting a configuration including a large-diameter guided portion that is formed in front of the male screw portion in the direction of the second central axis and that contacts the large-diameter guide portion with an outer diameter that is larger than the outer diameter of the male screw portion. Can do.
According to this configuration, when the male screw portion of the lens tube member is screwed into the female screw portion of the base tube member, the large-diameter guided portion of the lens tube member is not affected even if there is a backlash or the like in the screwing relationship. Guided by the large-diameter guide portion of the base cylinder member, the second central axis of the lens cylinder member (the optical axis of the lens) is made to coincide with the first central axis serving as the reference of the base cylinder member. The inclination of the second central axis (and the optical axis of the lens) is prevented.

In the above configuration, the guide portion is formed on the rear side of the female screw portion in the direction of the first central axis, and contacts the inner diameter smaller than the inner diameter of the female screw portion, and the front side of the female screw portion. A large-diameter guide portion that is formed on the side and contacts with an inner diameter larger than the inner diameter of the female screw portion, and the guided portion is formed on the rear side of the male screw portion in the direction of the second central axis. A small-diameter guided portion that comes into contact with the small-diameter guide portion with an outer diameter smaller than the outer diameter, and a large-diameter guide portion that is formed on the front side of the male screw portion and larger than the outer diameter of the male screw portion. A configuration including a large-diameter guided portion that comes into contact can be employed.
According to this configuration, when the male screw portion of the lens tube member is screwed to the female screw portion of the base tube member, the small-diameter guided portion of the lens tube member is the base even if the screwing relationship is loose. Guided by the small-diameter guide portion of the cylindrical member and the large-diameter guided portion of the lens cylindrical member is guided by the large-diameter guide portion of the base cylindrical member, the second central axis (lens optical axis) of the lens cylindrical member is the base cylinder. Since it is made to correspond with the 1st central axis used as the reference | standard of a member, the inclination of the 2nd central axis (and optical axis of a lens) with respect to a 1st central axis is prevented.
Here, as a guide part and a guided part, two guide parts (small-diameter guide part and large-diameter guide part) sandwiching the female screw part, and two guided parts (small-diameter guided part and large part) sandwiching the male screw part are used. Since the diameter guided portion) is employed, it is possible to more reliably prevent the optical axis from collapsing than when one guide portion and a guided portion are employed.

In the above-described configuration, the lens tube member may employ a configuration including an optical element assembled in a region inside the small-diameter guided portion in the direction of the second central axis.
According to this configuration, in order to provide an optical element (for example, a diaphragm member, an optical filter, etc.) inside the small-diameter guided portion of the lens tube member, the female screw portion and the male screw portion are sandwiched as the guide portion and the guided portion. While adopting the two guide portions and the guided portion arranged in the above, it is possible to suppress an increase in the total length in the direction of the optical axis (the direction of the first central axis and the second central axis) as the lens barrel, Desired optical properties can be obtained.

In the above configuration, it is possible to adopt a configuration in which the two guide portions and the guided portion are formed so as to be in contact with each other over the entire circumference region or to be in partial contact with each other over a plurality of locations in the entire circumference. it can.
According to this configuration, for example, the guided portion (small diameter guided portion, large diameter guided portion) of the lens tube member is formed as a cylindrical surface, and the guide portion (small diameter guide portion, large diameter guide portion) of the base tube member is formed. Can be reliably prevented from collapsing the optical axis even when formed in a cylindrical surface or in a form that contacts at a plurality of locations (at least three locations), and the guided portion (small-diameter guided portion, When the large-diameter guided portion is formed in a cylindrical surface or in a form of contact at multiple locations (at least three locations), and the guide portion (small-diameter guide portion, large-diameter guide portion) of the base cylinder member is formed as a cylindrical surface However, it is possible to reliably prevent the optical axis from falling.

An imaging device of the present invention is an imaging device including a lens barrel that holds a lens, and a substrate that is fixed to the rear end of the lens barrel and on which an imaging element is mounted. Any one of the lens barrels configured as described above is employed.
According to this configuration, it is easy to assemble while achieving simplification, miniaturization, cost reduction, etc., and adjustment of the optical axis of the lens (the optical axis can be prevented from collapsing, focus adjustment in the optical axis direction, etc.) ) Can be easily performed, the waterproof property can be secured, and an imaging device capable of securing desired optical characteristics can be obtained.

  According to the lens barrel having the above-described configuration, it is easy to assemble while achieving simplification of structure, downsizing, cost reduction, etc., and adjustment of the optical axis of the lens (the optical axis can be prevented from collapsing. The lens barrel that can easily adjust the focus in the direction, etc., can secure waterproofness, and can secure desired optical characteristics, and an imaging device including the lens barrel can be obtained.

1 is a side view showing a first embodiment of an imaging apparatus including a lens barrel according to the present invention. FIG. 2 is a cross-sectional view taken along line E1-E1 in FIG. 1, illustrating an engagement relationship between a base tube member and a lens tube member included in the lens barrel illustrated in FIG. 1. FIG. 2 shows a base cylinder member included in the lens barrel shown in FIG. 1, (a) is a side view thereof, (b) is a rear view as viewed from the rear, and (c) is through a first central axis thereof. It is a longitudinal cross-sectional view. FIG. 2 shows a lens barrel member included in the lens barrel shown in FIG. 1, (a) is a side view thereof, (b) is a rear view seen from the rear, and (c) is through a second central axis. It is a longitudinal cross-sectional view. FIG. 2 is a longitudinal sectional view illustrating an imaging apparatus including the lens barrel illustrated in FIG. 1 and passing through a first central axis and a second central axis (and an optical axis). It is a side view which shows 2nd Embodiment of the imaging device containing the lens barrel which concerns on this invention. FIG. 8 shows an engagement relationship between a base tube member and a lens tube member included in the lens barrel shown in FIG. 6, (a) is a cross-sectional view taken along line E2-E2 in FIG. 6, and (b) is shown in FIG. 6. It is sectional drawing in E3-E3. FIG. 7 shows a base cylinder member included in the lens barrel shown in FIG. 6, (a) is a side view thereof, (b) is a front view as viewed from the front, and (c) is through the first central axis. It is a longitudinal cross-sectional view. FIG. 7 shows a lens barrel member included in the lens barrel shown in FIG. 6, (a) is a side view thereof, (b) is a rear view as viewed from the rear side, and (c) is through a second central axis. It is a longitudinal cross-sectional view. FIG. 7 is a longitudinal sectional view illustrating an imaging apparatus including the lens barrel illustrated in FIG. 6 and passing through a first central axis and a second central axis (and an optical axis).

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, a first embodiment of a lens barrel and an imaging apparatus according to the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 5, a lens barrel according to this embodiment includes a base cylinder member 10 formed in a substantially cylindrical shape, and a lens formed in a substantially cylindrical shape and assembled to the base cylinder member 10 by screwing. A cylindrical member 20 and the like are provided.
An imaging device is configured by assembling a substrate 40 on which the imaging element 30 is mounted on the lens barrel (the rear end of the base cylinder member 10).

  The base tube member 10 is formed of a resin material or the like, and as shown in FIGS. 3A, 3B, and 3C, a cylindrical base tube portion that defines a reference first central axis S1. 11, a base flange portion 12 formed at the rear end of the base tube portion 11, a female screw portion 13 as a first screw portion formed on the inner periphery of the base tube portion 11, and a female screw in the direction of the first central axis S1 A cylindrical guide part 14 as a guide part formed on the inner periphery of the base cylinder part 11 adjacent to the front side F of the part 13, on the rear side R of the female screw part 13 in the direction of the first central axis S1. A concave portion 15 or the like for attaching the optical filter OF as the formed optical element is provided.

As shown in FIGS. 3A and 3C, the base cylinder portion 11 is formed in a cylindrical shape that extends in the direction of the first central axis S1.
As shown in FIGS. 3A, 3 </ b> B, and 3 </ b> C, the base flange portion 12 is integrally formed at the rear end of the base cylinder portion 11, and a substrate 40 on which the imaging element 30 is mounted is attached. The rear end surface 12a has a substantially rectangular outline as much as possible.
As shown in FIGS. 3B, 3 </ b> C, and 5, the rear end surface 12 a has a center vertical line passing through the center of the imaging surface of the mounted image sensor 30 as the first center in a state where the substrate 40 is attached. It is formed so as to coincide with the axis S1 (that is, the perpendicularity with respect to the first central axis S1 and the manufacturing dimensions such as the positioning portion of the center position of the image sensor 30 are controlled to be predetermined values).

As shown in FIGS. 3C and 5, the female screw portion 13 is formed over the inner circumference of the base cylinder portion 11 over a predetermined length in the direction of the first central axis S <b> 1. The male screw part 23 of the member 20 is screwed together.
As shown in FIGS. 2, 3 (c), and 5, the cylindrical guide portion 14 forms a cylindrical surface 14 a adjacent to the front side F of the female screw portion 13 on the inner periphery of the base cylindrical portion 11. Is formed.
The cylindrical surface 14a has a predetermined length in the direction of the first central axis S1, and is formed such that its center line coincides with the first central axis S1 (that is, the degree of coaxiality with respect to the first central axis S1, etc. Manufacturing dimensions are controlled).
The cylindrical guide portion 14 is configured to align the second central axis S2 with the first central axis S1 when the male screw portion 23 of the lens tube member 20 is screwed to the female screw portion 13 of the base tube member 10. It serves to guide the lens tube member 20.
As shown in FIGS. 3C and 5, the concave portion 15 is bonded by inserting an optical filter OF having a substantially rectangular shape between the female screw portion 13 and the base flange portion 12 in the direction of the first central axis S1. In order to fix by, etc., it is formed so as to form a substantially rectangular ring.

  The lens tube member 20 is formed of a resin material or the like. As shown in FIGS. 4A, 4B, and 4C, the lens tube portion 21 and the lens tube portion 21 that define the second central axis S2. A holding part 21a that holds the lens G, an outer ring part 22 formed on the outer periphery of the lens cylinder part 21, and a male thread part 23 as a second screw part formed on the outer periphery of the lens cylinder part 21. A cylindrical guided portion 24 as a guided portion formed on the outer periphery of the lens tube portion 21 is provided adjacent to the front side F of the male screw portion 23 in the direction of the second central axis S2.

As shown in FIGS. 4A, 4B, and 4C, the lens tube portion 21 is formed in a multistage cylindrical shape that extends in the direction of the second central axis S2.
The holding part 21a is formed so that the lens G is fitted and fixed. Here, when the lens G is assembled to the lens tube member 20 in advance, the lens G is incorporated while adjusting so that the optical axis L thereof coincides with the second central axis S2.
As shown in FIG. 5, the outer ring portion 22 is formed to have substantially the same outer contour as the outer contour of the base cylindrical portion 11 of the base cylindrical member 10 in a state of being screwed to the base cylindrical member 10. .
As shown in FIGS. 4A and 5, the male screw portion 23 is formed over a predetermined length in the direction of the second central axis S <b> 2 on the inner periphery of the lens tube portion 21. The internal thread portion 13 of the member 10 is screwed.
As shown in FIGS. 2, 4 (a), (c) and FIG. 5, the cylindrical guided portion 24 is adjacent to the front side F of the male screw portion 23 on the outer periphery of the lens tube portion 21. It is formed to make.
The cylindrical surface 24a has a predetermined length in the direction of the second central axis S2, and is formed such that its center line coincides with the second central axis S2 (that is, the degree of coaxiality with respect to the second central axis S2, etc.) Manufacturing dimensions are controlled).
The cylindrical guided portion 24 then aligns the second central axis S2 with the first central axis S1 when the male screw portion 23 of the lens tube member 20 is screwed into the female screw portion 13 of the base tube member 10. It is guided by the cylindrical guide portion 14 of the base cylinder member 10.

Next, an assembling operation of the lens barrel having the above configuration will be described.
First, the base cylinder member 10 in which the optical filter OF is assembled in advance, the lens cylinder member 20 in which the lens G is assembled in advance so that the optical axis L coincides with the second central axis S2, and the image sensor 30 for inspection are mounted. A substrate 40 and the like are prepared.
Then, the inspection substrate 40 is attached to the rear end of the base cylinder member 10 (the rear end surface 12a of the base flange portion 12), and the base cylinder member 10 and the substrate 40 are fixed at predetermined positions.
Subsequently, the lens cylinder member 20 in which an adhesive is applied in advance to the male screw portion 23 or the like is brought close to the front side F of the base cylinder member 10 and the male screw portion 23 is fitted into the female screw portion 13 while being screwed. It is.

Then, at the time of the screwing, the cylindrical guided portion 24 as the guided portion of the lens tube member 20 is guided over the entire circumference by the cylindrical guide portion 14 as the guide portion of the base tube member 10, and the lens tube. The second central axis S2 of the member 20 (the optical axis L of the lens G) is made to coincide with the first central axis S1 serving as the reference of the base cylinder member 10, and the second central axis S2 (and the lens G with respect to the first central axis S1). The inclination of the optical axis L) is prevented.
Thus, the first central axis S1 of the base cylinder member 10, the second central axis S2 of the lens cylinder member 20, and the optical axis L of the lens G held by the lens cylinder member 20 all coincide on the same straight line. Will do.
And while confirming the image image | photographed with the image pick-up element 30, adjusting the screwing amount (screwing amount of the external thread part 23 with respect to the internal thread part 13) of the lens cylinder member 20 suitably, the optical axis L The focus adjustment in the direction (the direction of the first central axis S1 and the second central axis S2) can be performed, and after adjustment, the pre-applied adhesive is fixed by natural drying to prevent adjustment position deviation. Is done.

As described above, by adopting the cylindrical guide portion 14 and the cylindrical guided portion 24 as the guide portion and the guided portion, there is a backlash due to a dimensional variation or the like in the screwed relationship between the male screw portion 23 and the female screw portion 13. In addition, the optical axis can be prevented from collapsing during assembly.
Also, as a guide part and a guided part, adjacent to one cylindrical guide part 14 and male screw part 23 forming a cylindrical surface 14a adjacent to the female screw part 13 (and having a predetermined length in the direction of the first central axis S1). By adopting one cylindrical guided portion 24 having a cylindrical surface 24a (and having a predetermined length in the direction of the second central axis S2), the base cylinder member 10 and the lens cylinder member 20 are moved in the direction of the optical axis L ( The optical axis can be prevented from collapsing while being downsized in the direction of the first central axis S1 and the second central axis S2.

In addition, a male screw portion 23 formed on the outer periphery of the lens tube member 20 (the lens tube portion 21) is provided to a female screw portion 13 formed on the inner periphery of the base tube member 10 (the base tube portion 11). Since the lens cylinder member 20 is assembled so as to be fitted inside the base cylinder member 10, the visibility is good and the assembling work can be easily performed. Since no through hole or the like is provided in the outer wall of the lens tube member 20, it is possible to prevent water droplets or the like from entering the inside.
Here, the procedure for assembling the lens barrel while temporarily inspecting and inspecting the inspection substrate 40 has been shown, but it may be provided as an imaging device with the substrate 40 mounted with the imaging element 30 assembled. Good.

  According to the lens barrel having the above-described configuration, when manufacturing the base cylinder member 10 and the lens cylinder member 20, the predetermined dimensions are managed, and the lens cylinder member 20 incorporating the lens G is screwed into the base cylinder member 10. By simply assembling and adjusting the focus, the entire optical axis can be adjusted easily, and the assembly is easy while satisfying the desired optical characteristics while achieving simplification, miniaturization, cost reduction, etc. A lens barrel can be obtained.

Next, a second embodiment of a lens barrel and an imaging apparatus according to the present invention will be described with reference to FIGS.
As shown in FIGS. 6 to 10, the lens barrel according to this embodiment includes a base cylinder member 100 formed in a substantially cylindrical shape, and a lens formed in a substantially cylindrical shape and assembled to the base cylinder member 100 by screwing. A cylindrical member 200 and the like are provided.
Then, the imaging apparatus is configured by assembling the substrate 40 on which the imaging element 30 is mounted on the lens barrel (the rear end of the base cylinder member 100).

  The base tube member 100 is formed of a resin material or the like, and as shown in FIGS. 8A, 8B, and 8C, a cylindrical base tube portion that defines a reference first central axis S1. 101, a base flange portion 102 formed at the rear end of the base tube portion 101, a female screw portion 103 as a first screw portion formed on the inner periphery of the base tube portion 101, and a female screw in the direction of the first central axis S1 A small-diameter guide portion 104 that is formed between the portion 103 and the base flange portion 102 and that contacts with an inner diameter smaller than the inner diameter of the female screw portion 103, on the opposite side of the small-diameter guide portion 104 across the female screw portion 103. A large-diameter guide portion 105 as a guide portion that is formed and contacts with an inner diameter larger than the inner diameter of the female screw portion 103 is provided.

As shown in FIGS. 8A and 8C, the base cylinder portion 101 is formed in a cylindrical shape that extends in the direction of the first central axis S1.
As shown in FIGS. 8A, 8 </ b> B, and 8 </ b> C, the base flange portion 102 is integrally formed at the rear end of the base cylinder portion 101, and the substrate 40 on which the image sensor 30 is mounted is attached. The rear end surface 102a has a substantially rectangular outline as much as possible.
As shown in FIGS. 8B, 8 </ b> C, and 10, the rear end surface 102 a has a center vertical line that passes through the center of the imaging surface of the mounted image sensor 30 as the first center in the state where the substrate 40 is attached. It is formed so as to coincide with the axis S1 (that is, the perpendicularity with respect to the first central axis S1 and the manufacturing dimensions such as the positioning portion of the center position of the image sensor 30 are controlled to be predetermined values).

As shown in FIGS. 8C and 10, the female screw portion 103 is formed over the inner circumference of the base tube portion 101 over a predetermined length in the direction of the first central axis S <b> 1. The male screw part 203 of the member 200 is screwed together.
As shown in FIGS. 7B, 8 </ b> C, and 10, the small-diameter guide portion 104 is a regular hexagonal column adjacent to the rear side R of the female screw portion 103 on the inner periphery of the base cylindrical portion 101. It is formed so as to form an opening, and guides the small-diameter guided portion 204 of the lens tube member 200 while being in contact with six locations.
Here, the small-diameter guide portion 104 has a predetermined length in the direction of the first central axis S1, and is formed so that the center line of the inscribed circle inscribed in the opening coincides with the first central axis S1. (That is, manufacturing dimensions such as coaxiality with respect to the first central axis S1 are managed).
As shown in FIGS. 7A, 8 </ b> C, and 10, the large-diameter guide portion 105 is adjacent to the front side F of the female screw portion 103 on the inner periphery of the base cylinder portion 101. Are formed so as to form six ridges arranged at intervals of 60 degrees, and guide the large-diameter guided portion 205 of the lens tube member 200 at six locations.
Here, the large-diameter guide portion 105 (six ridges) has a predetermined length in the direction of the first central axis S1, and the center line of the inscribed circle inscribed therein coincides with the first central axis S1. (That is, manufacturing dimensions such as coaxiality with respect to the first central axis S1 are managed).
The small-diameter guide portion 104 and the large-diameter guide portion 105 use the second central axis S2 as the first central axis when the male screw portion 203 of the lens tube member 200 is screwed into the female screw portion 103 of the base tube member 100. It serves to guide the lens barrel member 200 so as to coincide with S1.

  The lens cylinder member 200 is formed of a resin material or the like, and as shown in FIGS. 9A, 9B, and 9C, a lens cylinder part 201 and a lens cylinder part 201 that define the second central axis S2. A holding part 201 a that holds the lens G, an outer ring part 202 formed on the outer periphery of the lens cylinder part 201, and a male screw part 203 as a second screw part formed on the outer periphery of the lens cylinder part 201. In the direction of the second central axis S2, the small-diameter guide portion 104 has an outer diameter smaller than the outer diameter of the male screw portion 203 formed on the outer periphery of the lens tube portion 201 adjacent to the rear side R of the male screw portion 203. A small diameter guided portion 204 that contacts and a large diameter that is formed on the opposite side of the small diameter guided portion 204 across the male screw portion 203 and that contacts the large diameter guide portion 105 with an outer diameter larger than the outer diameter of the male screw portion 203. Guided portion 205, second central axis And a concave portion 206 and the like to attach the optical filter OF as an optical element formed on a region inside the small diameter guided portion 204 at the rear side R of the holding portion 201a in the second direction.

As shown in FIGS. 9A, 9B, and 9C, the lens tube portion 201 is formed in a multistage cylindrical shape that extends in the direction of the second central axis S2.
The holding part 201a is formed so that the lens G is fitted and fixed. Here, when the lens G is assembled to the lens barrel member 200 in advance, the lens G is incorporated while adjusting so that the optical axis L thereof coincides with the second central axis S2.
As shown in FIG. 10, the outer ring portion 202 is formed to have substantially the same outer contour as the outer contour of the base cylindrical portion 101 of the base cylindrical member 100 in a state of being screwed to the base cylindrical member 10. .
As shown in FIGS. 9A and 10, the male screw portion 203 is formed over the inner circumference of the lens tube portion 201 over a predetermined length in the direction of the second central axis S2. The female thread portion 103 of the member 100 is screwed together.
The small-diameter guided portion 204 is adjacent to the rear side R of the male screw portion 203 on the outer periphery of the lens tube portion 201 as shown in FIGS. 7B, 9A, 9C, and 10. It is formed so as to form a cylindrical surface 204a.
The cylindrical surface 204a has a predetermined length in the direction of the second central axis S2, and is formed so that the center line thereof coincides with the second central axis S2 (that is, the degree of coaxiality with respect to the second central axis S2, etc.) Manufacturing dimensions are controlled).
The large-diameter guided portion 205 is adjacent to the front side F of the male screw portion 203 on the outer periphery of the lens tube portion 201 as shown in FIGS. 7 (a), 9 (a), 9 (c) and FIG. Are formed so as to form a cylindrical surface 205a.
The cylindrical surface 205a has a predetermined length in the direction of the second central axis S2, and is formed such that its center line coincides with the second central axis S2 (that is, the degree of coaxiality with respect to the second central axis S2, etc. Manufacturing dimensions are controlled).
The small-diameter guided portion 204 and the large-diameter guided portion 205 are configured such that when the male screw portion 203 of the lens tube member 200 is screwed into the female screw portion 103 of the base tube member 100, the second central axis S2 is the first. They are respectively guided by the small diameter guide portion 104 and the large diameter guide portion 105 of the base cylinder member 100 so as to coincide with the central axis S1.
As shown in FIG. 9C and FIG. 10, the concave portion 206 is formed by inserting an optical filter OF having a substantially circular shape into the inner region of the small-diameter guided portion 204 in the direction of the second central axis S2, and bonding or the like. In order to fix, it is formed so as to form a substantially annular shape.

Next, an assembling operation of the lens barrel having the above configuration will be described.
First, the base cylinder member 100, the lens cylinder member 200 in which the lens G is pre-assembled so that the optical axis L coincides with the second central axis S2, and the optical filter OF are pre-assembled, and the imaging element 30 for inspection are mounted. A substrate 40 and the like are prepared.
Then, the inspection substrate 40 is attached to the rear end of the base tube member 100 (the rear end surface 102a of the base flange portion 102), and the base tube member 100 and the substrate 40 are fixed at predetermined positions.
Subsequently, the lens tube member 200 in which an adhesive is applied in advance to the male screw portion 203 or the like is brought close to the front side F of the base tube member 100, and the male screw portion 203 is fitted into the female screw portion 103 while being screwed. It is.

Then, at the time of the screwing, the small-diameter guided portion 204 and the large-diameter guided portion 205 as the guided portions of the lens tube member 200 become the small-diameter guide portion 104 and the large-diameter guide portion as the guide portions of the base cylinder member 100. The second central axis S2 of the lens barrel member 200 (the optical axis L of the lens G) is aligned with the first central axis S1 that serves as a reference for the base barrel member 100, and is guided by the respective 105. The inclination of the second central axis S2 (and the optical axis L of the lens G) is prevented.
Thus, the first central axis S1 of the base cylinder member 100, the second central axis S2 of the lens cylinder member 200, and the optical axis L of the lens G held by the lens cylinder member 200 all coincide on the same straight line. Will do.
And while confirming the image image | photographed with the image pick-up element 30, adjusting the screwing amount (screwing amount of the external thread part 203 with respect to the internal thread part 103) of the lens cylinder member 200 suitably, the optical axis L The focus adjustment in the direction (the direction of the first central axis S1 and the second central axis S2) can be performed, and after adjustment, the pre-applied adhesive is fixed by natural drying to prevent adjustment position deviation. Is done.

  As described above, two guide portions (small-diameter guide portion 104 and large-diameter guide portion 105) formed with the female screw portion 103 interposed therebetween, and two formed with the male screw portion 203 interposed therebetween as the guide portion and the guided portion. By adopting two guided portions (small-diameter guided portion 204 and large-diameter guided portion 205), even if there is a backlash due to dimensional variation or the like in the screwed relationship between the male screw portion 203 and the female screw portion 103, It is possible to prevent the optical axis from collapsing at the time of attachment, and to prevent the optical axis from collapsing more reliably than in the case where one guide part and guided part are employed.

In addition, in order to provide the optical filter OF inside the small-diameter guided portion 204 of the lens tube member 200, two guide portions (a guide portion and a guided portion) that are arranged with the female screw portion 103 and the male screw portion 203 interposed therebetween ( While adopting the small-diameter guide portion 104 and the large-diameter guide portion 105) and the guided portions (small-diameter guided portion 204 and large-diameter guided portion 205), the direction of the optical axis L as the lens barrel (first central axis) It can suppress that the full length in the direction of S1 and 2nd central axis S2) becomes long, and can obtain a desired optical characteristic.
Furthermore, a male screw portion 203 formed on the outer periphery of the lens tube member 200 (the lens tube portion 201) is provided to a female screw portion 103 formed on the inner periphery of the base tube member 100 (the base tube portion 101). Assembling while screwing, that is, assembling the lens tube member 200 so as to be fitted inside the base tube member 100, the visibility is good and the assembling work can be easily performed. Since no through hole or the like is provided in the outer wall of the lens tube member 200, it is possible to prevent water droplets or the like from entering the inside.
Here, the procedure for assembling the lens barrel while temporarily inspecting and inspecting the inspection substrate 40 has been shown, but it may be provided as an imaging device with the substrate 40 mounted with the imaging element 30 assembled. Good.

  According to the lens barrel having the above configuration, when manufacturing the base cylinder member 100 and the lens cylinder member 200, the predetermined dimensions are managed, and the lens cylinder member 200 incorporating the lens G is screwed into the base cylinder member 100. By simply assembling and adjusting the focus, the entire optical axis can be adjusted easily, and the assembly is easy while satisfying the desired optical characteristics while achieving simplification, miniaturization, cost reduction, etc. A lens barrel can be obtained.

In the above-described embodiment, the case where the present invention is employed in the configuration including the screwed structure as the means for assembling the lens cylinder members 20 and 200 to the base cylinder members 10 and 100 is shown, but the present invention is not limited thereto. However, the present invention may be employed in a configuration provided with other assembling means as long as the assembling causes a problem such as tilting of the optical axis.
In the above embodiment, the female screw portions 13 and 103 are employed as the first screw portions formed on the base tube members 10 and 100, and the male screw portions 23 and 203 are formed as the second screw portions formed on the lens tube members 20 and 200. However, the present invention is not limited to this, and conversely, a male screw portion is employed as the first screw portion formed on the base tube member, and a second screw portion formed on the lens tube member. You may apply this invention in the structure which employ | adopts an internal thread part.

In the above embodiment, as the guide portion provided on the base tube member and the guided portion provided on the lens tube member, the base tube member 100 is provided with the small-diameter guide portion 104 and the large-diameter guide portion 105, and the lens tube member 200 is guided with the small-diameter guide. However, the present invention is not limited to this, and the base tube member is provided with only the small diameter guide portion or the large diameter guide portion, and the lens tube member is provided with the small diameter cover portion. You may employ | adopt the structure which provided only the guide part and only the large diameter guided part.
In the above embodiment, the optical filter OF is employed as the optical element attached to the base cylinder member 10 and the optical filter OF is employed as the optical element attached to the lens cylinder member 200. However, the present invention is not limited to this. Alternatively, other optical elements such as a diaphragm member may be attached.

  As described above, the lens barrel of the present invention is easy to assemble while achieving simplification of structure, miniaturization, cost reduction, etc., and can adjust the optical axis of the lens (can prevent the optical axis from collapsing). , Focus adjustment in the optical axis direction, etc.) can be easily performed, waterproofness can be secured, and desired optical characteristics can be secured, so it can be used as a lens barrel of a normal camera (imaging device) Needless to say, it can be used as a lens barrel for surveillance cameras or in-vehicle cameras, and other lens optical systems for recognition or imaging, or lenses that are used in severe environments where miniaturization is required. It is also useful in digital cameras, video cameras, and other imaging devices that include optical systems.

10, 100 Base cylinder member S1 First central shaft 11, 101 Base cylinder part 12, 102 Base flange part 13, 103 Female thread part (first thread part)
14 Cylindrical guide portion 14a Cylindrical surfaces 15, 206 Recesses 20, 200 Lens tube member S2 Second central axis G Lens L Optical axes 21, 201 Lens tube portions 22, 202 Outer ring portions 23, 203 Male screw portion (second screw portion) )
24 cylindrical guided portion 24a cylindrical surface 104 small diameter guide portion 105 large diameter guide portion 204 small diameter guided portion 205 large diameter guided portion 204a, 205a cylindrical surface OF optical filter (optical element)
30 Image sensor 40 Substrate

Claims (6)

A base cylinder member having a base cylinder portion defining a first central axis serving as a reference; and a lens cylinder member having a lens cylinder portion defining a second central axis that holds the lens and matches the optical axis of the lens. A lens barrel for assembling the lens cylinder member to the base cylinder member,
The base tube member has a guide portion that guides the lens tube member so that the second center axis coincides with the first center axis,
The lens tube member has a guided portion guided by the guide portion so that the second central axis coincides with the first central axis.
The base cylinder member has a female screw part formed on the inner periphery of the base cylinder part,
The lens tube member has a male screw portion formed on the outer periphery of the lens tube portion,
The lens cylinder member is assembled to the base cylinder member by screwing the male screw part into the female screw part,
The guide part is formed inside the base cylinder part,
The guided portion is formed outside the lens tube portion,
The guide portion includes a small-diameter guide portion that is formed closer to the image sensor than the female screw portion in the direction of the first central axis and contacts with an inner diameter that is smaller than the inner diameter of the female screw portion,
The guided portion is a small-diameter guided portion that is formed closer to the imaging element than the male screw portion in the direction of the second central axis and contacts the small-diameter guide portion with an outer diameter smaller than the outer diameter of the male screw portion. Part
The base cylinder member, have a base flange portion on an end portion of the imaging element side of the base tubular portion,
The lens tube member includes an optical element assembled between the female screw portion and the base flange portion and in an area inside the small-diameter guided portion.
A lens barrel characterized by that. The optical element is a diaphragm member or an optical filter;
The lens barrel according to claim 1. The guide part is one cylindrical guide part formed so as to form a cylindrical surface adjacent to the female screw part on the inner periphery of the base cylinder part,
The guided portion is one cylindrical guided portion formed so as to form a cylindrical surface adjacent to the male screw portion on the outer periphery of the lens tube portion.
The lens barrel according to claim 1 or 2, wherein The guide portion includes a large-diameter guide portion that is formed closer to the subject than the female screw portion in the direction of the first central axis and contacts with an inner diameter that is larger than an inner diameter of the female screw portion,
The guided portion is formed on the subject side of the male screw portion in the direction of the second central axis, and has a large diameter covered with an outer diameter larger than the outer diameter of the male screw portion. Including the guide,
The lens barrel according to any one of claims 1 to 3, wherein: The guide portion and the guided portion are formed so as to be in contact with each other over the entire peripheral region or partially in contact with each other over a plurality of locations in the entire periphery.
The lens barrel according to any one of claims 1 to 4, wherein: An imaging apparatus comprising: a lens barrel that holds a lens; and a substrate that is fixed to a rear end of the lens barrel and on which an imaging element is mounted,
The lens barrel is the lens barrel according to any one of claims 1 to 5,
An imaging apparatus characterized by that.

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