CN110320627B - Lens unit and method for manufacturing the same - Google Patents
Lens unit and method for manufacturing the same Download PDFInfo
- Publication number
- CN110320627B CN110320627B CN201810295472.2A CN201810295472A CN110320627B CN 110320627 B CN110320627 B CN 110320627B CN 201810295472 A CN201810295472 A CN 201810295472A CN 110320627 B CN110320627 B CN 110320627B
- Authority
- CN
- China
- Prior art keywords
- lens
- holder
- optical axis
- axis direction
- cylindrical portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 115
- 230000002093 peripheral effect Effects 0.000 claims abstract description 65
- 239000012790 adhesive layer Substances 0.000 claims description 22
- 239000011521 glass Substances 0.000 claims description 16
- 238000003466 welding Methods 0.000 claims description 4
- 230000006866 deterioration Effects 0.000 abstract description 9
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 238000001723 curing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
A lens unit and a method for manufacturing the lens unit, even if a small-sized first lens is used in the middle of an optical system, deterioration of optical performance and deviation of optical performance of the lens unit due to the presence of the first lens can be easily avoided. The lens unit of the present invention has a plurality of lenses and a lens barrel holding the plurality of lenses, the plurality of lenses including a first lens, and a second lens and a third lens located on both sides of and adjacent to the first lens in an optical axis direction, the first lens being held by the lens barrel via a first holding frame so as to be located on an inner peripheral side of a cylindrical portion of the first holding frame, wherein the first lens has a shape capable of adjusting a position in a direction perpendicular to the optical axis direction in a state where an outer peripheral surface of the first lens is opposed to an inner peripheral surface of the cylindrical portion, and the first lens is fixed to the first holding frame via a fixing mechanism.
Description
Technical Field
The present invention relates to a lens unit and a method of manufacturing the lens unit, and more particularly, to a lens unit of a plurality of lenses and a lens barrel holding the plurality of lenses and a method of manufacturing the lens unit.
Background
Conventionally, there is a lens unit including a plurality of lenses arranged in an optical axis direction and a lens barrel holding the plurality of lenses, and in order to improve temperature characteristics and the like, in an optical system of the lens unit, a glass lens as a spherical lens having a small radius is disposed in the vicinity of an aperture as one of the plurality of lenses.
In the lens unit, since the radius of the glass lens disposed near the diaphragm is small, the flange surface or the like cannot be produced, the glass lens has been assembled by the following method in the past: as shown in fig. 4, the glass lens 15X is first pressed into the holder 30X, then the glass lens 15X and the holder 30X are joined by an adhesive layer, caulking, or the like, and then the holder holding the glass lens is gently pressed into the barrel of the lens unit to maintain coaxiality between the glass lens and other lenses, and the holder is sandwiched by front and rear optical elements to maintain the position of the holder (glass lens) in the optical axis direction.
In addition, in the lens unit, the glass lens may use a biconvex lens having a small radius, in which case the glass lens has a very large optical power, and the lens having a large optical power may significantly deteriorate optical performance when the lens position and tilt deviate from the design center, and thus it is necessary to maintain the lens position and tilt with high accuracy. However, since a flange surface or the like cannot be formed by a lenticular lens having a small radius, it is difficult to accurately hold the position and the inclination of the lenticular lens by a holder, and particularly, the inclination has a very large influence on the optical performance, and in the case of using a lenticular lens having a small radius as a glass lens, the optical performance of a lens unit is easily deteriorated and the optical performance is easily deviated due to the presence of the glass lens.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lens unit and a method for manufacturing the lens unit, which can easily avoid deterioration of optical performance and variation of optical performance of the lens unit due to the presence of a small-sized glass lens in the middle of an optical system.
In order to achieve the above object, a first aspect of the present invention provides a lens unit including a plurality of lenses and a barrel holding the plurality of lenses, the plurality of lenses including a first lens, and a second lens and a third lens located on both sides of and adjacent to the first lens in an optical axis direction, the first lens being held by the barrel via a first holding frame so as to be located on an inner peripheral side of a cylindrical portion of the first holding frame, characterized in that the first lens has a shape capable of adjusting a position in a direction perpendicular to the optical axis direction in a state where an outer peripheral surface of the first lens is opposed to an inner peripheral surface of the cylindrical portion, the first lens being fixed to the first holding frame via a fixing mechanism.
According to the lens unit of the present invention, since the first lens has a shape in which the position can be adjusted in the direction perpendicular to the optical axis direction in a state in which the outer peripheral surface of the first lens is opposed to the inner peripheral surface of the cylindrical portion, the position and the inclination of the first lens can be easily held with high accuracy even if the first lens having a small size is used in the middle of the optical system by fixing the first lens to the first holding frame by the fixing mechanism after the position and/or the inclination of the first lens in the optical axis direction are adjusted, and deterioration of the optical performance and variation of the optical performance of the lens unit due to the presence of the first lens can be avoided.
In the lens unit according to the present invention, it is preferable that the fixing means is a fixing portion for connecting the first lens to the first holder, and the fixing portion is at least one of an adhesive layer, a welded portion, and a caulking portion.
According to the lens unit of the present invention, the first lens can be fixed to the first holder conveniently, and in particular, in the case where the fixing portion is constituted by the adhesive layer, when the first lens is fixed to the first holder after the position in the optical axis direction and/or the inclination with respect to the optical axis direction of the first lens is adjusted at the time of assembly, the first lens can be fixed to the first holder by merely filling the uncured adhesive between the first lens and the first holder and curing it, whereby deterioration in optical performance and variation in optical performance of the lens unit due to the presence of the first lens can be easily avoided.
Further, in the lens unit of the present invention, it is preferable that the fixing mechanism includes: a second holder fitted to the first lens, the second holder having a shape capable of adjusting a position in a direction perpendicular to an optical axis direction in a state where an outer peripheral surface of the second holder is opposed to an inner peripheral surface of the cylindrical portion of the first holder; and a fixing portion connecting the second holder with the first holder, the fixing portion being at least one of an adhesive layer, a welding portion, and a caulking portion.
According to the lens unit of the present invention, the second holder can be easily fixed to the first holder, and the first lens and the second holder can be fitted at first at the time of assembly, and then the position of the first lens in the optical axis direction and/or the inclination with respect to the optical axis direction can be adjusted in a state where the second holder is gripped.
In the lens unit of the above configuration, the following configuration may be adopted: the fixing portion is disposed in the entire circumferential direction of the first lens.
According to the lens unit of the present invention, the first lens is stably fixed to the first holder while being balanced.
In the lens unit of the above configuration, the following configuration may be adopted: the second holder is formed with a clamped portion to be clamped by the clamping mechanism.
According to the lens unit of the present invention, after the first lens is fitted to the second holder at the time of assembly, the second holder to which the first lens is fitted can be easily operated, which contributes to improvement of the working efficiency of assembly.
In the lens unit of the above configuration, the following configuration may be adopted: the first holder includes a protrusion protruding radially inward from an inner peripheral surface of the cylindrical portion, the second holder is located on an inner peripheral side of the cylindrical portion and is opposed to the protrusion in an optical axis direction, and the fixing portion is formed between the second holder and the protrusion and/or the cylindrical portion.
According to the lens unit of the present invention, the second holder can be easily fixed to the first holder by the fixing portion, as compared with the case where the first holder does not include the protruding portion.
In the lens unit of the present invention, it is preferable that the first holder is abutted against the second lens and the third lens in the optical axis direction.
According to the lens unit of the present invention, the position of the first lens in the optical axis direction can be positioned with ease by the first holding frame.
In the lens unit of the present invention, it is preferable that the first lens is a spherical lens made of glass.
According to the lens unit of the present invention, the first lens is easy to manufacture, contributing to a reduction in manufacturing cost of the lens unit.
In the lens unit according to the present invention, it is preferable that the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the first lens are respectively circular, and the first lens has an outer diameter smaller than an inner diameter of the cylindrical portion.
According to the lens unit of the present invention, when adjusting the position of the first lens in the optical axis direction and/or the inclination with respect to the optical axis direction, the first lens is less likely to be caught by the cylindrical portion, and the gap for filling the adhesive layer can be ensured between the cylindrical portion of the first holder and the first lens with ease, contributing to an improvement in the assembly efficiency.
In order to achieve the above object, a second aspect of the present invention provides a method for manufacturing a lens unit having a plurality of lenses and a barrel holding the plurality of lenses, the plurality of lenses including a first lens and a second lens and a third lens located on both sides of and adjacent to the first lens in an optical axis direction, the first lens being held by the barrel by a first holding frame so as to be located on an inner peripheral side of a cylindrical portion of the first holding frame, characterized in that the first lens has a shape capable of adjusting a position in a direction perpendicular to the optical axis direction in a state where an outer peripheral surface of the first lens is opposed to the inner peripheral surface of the cylindrical portion, and the first lens is held by the first holding frame via a fixing mechanism after adjusting a position of the first lens in the optical axis direction and/or an inclination with respect to the optical axis direction.
According to the method for manufacturing a lens unit of the present invention, the first lens has a shape that enables the position to be adjusted in the direction perpendicular to the optical axis direction in a state in which the outer peripheral surface of the first lens is opposed to the inner peripheral surface of the cylindrical portion, and the first lens is fixed to the first holding frame by the fixing mechanism after the position in the optical axis direction and/or the inclination with respect to the optical axis direction of the first lens are adjusted, whereby the position and the inclination of the first lens are easily held with high accuracy even if the first lens of a small size is used in the middle of the optical system, and deterioration in optical performance and variation in optical performance of the lens unit due to the presence of the first lens are avoided.
In the method for manufacturing a lens unit according to the present invention, it is preferable that the fixing means is a fixing portion for connecting the first lens to the first holder, and the fixing portion is at least one of an adhesive layer, a welded portion, and a caulking portion.
According to the method for manufacturing a lens unit of the present invention, after adjusting the position of the first lens in the optical axis direction and/or the inclination with respect to the optical axis direction, the first lens can be easily fixed to the first holder, whereby deterioration in optical performance and deviation in optical performance of the lens unit due to the presence of the first lens can be easily avoided.
In the method for manufacturing a lens unit according to the present invention, the fixing means preferably includes: a second holder fitted to the first lens, the second holder having a shape capable of adjusting a position in a direction perpendicular to an optical axis direction in a state where an outer peripheral surface of the second holder is opposed to an inner peripheral surface of the cylindrical portion of the first holder; and a fixing portion that connects the second holder to the first holder, the fixing portion being at least one of an adhesive layer, a welded portion, and a caulking portion, wherein after the first lens is fitted to the second holder, a position of the first lens in an optical axis direction and/or an inclination with respect to the optical axis direction is adjusted in a state of holding the second holder, and then the second holder is fixed to the first holder by the fixing portion.
According to the method for manufacturing a lens unit of the present invention, the second holder can be easily fixed to the first holder, and when assembling, the first lens is fitted to the second holder, and then the position of the first lens in the optical axis direction and/or the inclination with respect to the optical axis direction is adjusted while holding the second holder, so that the contact operation with the first lens can be reduced, and the possibility of abrasion, scratch, or the like of the first lens during the assembling process can be reduced.
(Effects of the invention)
According to the present invention, since the first lens has a shape that enables the position to be adjusted in the direction perpendicular to the optical axis direction in a state in which the outer peripheral surface of the first lens is opposed to the inner peripheral surface of the cylindrical portion of the first holder, and the first lens is held by the first holder via the fixing mechanism without being directly pushed into the first holder, the first lens can be fixed to the first holder by the fixing mechanism after the position in the optical axis direction and/or the inclination with respect to the optical axis direction of the first lens are adjusted, whereby the position and the inclination of the first lens can be easily held with high accuracy even when the first lens having a small size is used in the middle of the optical system, and deterioration in the optical performance and variation in the optical performance of the lens unit due to the presence of the first lens can be avoided.
Drawings
Fig. 1 is a side sectional view schematically showing the overall structure of a lens unit according to a first embodiment of the present invention.
Fig. 2 is a side cross-sectional view schematically showing a fixing structure of a first lens in a lens unit according to a first embodiment of the present invention.
Fig. 3 is a side cross-sectional view schematically showing a fixing structure of a first lens in a lens unit according to a second embodiment of the present invention.
Fig. 4 is a side sectional view schematically showing a fixing structure of a first lens in a conventional lens unit.
(Symbol description)
1. Lens unit
11. Lens
12. Lens
13. Lens
14. Second lens
15. First lens
16. Third lens
17. Lens
20. Lens barrel
21. Cylindrical body part
22. Annular flange part
23. Large diameter cylinder
24. Annular bottom plate part
25. Annular step part
26. Annular groove
27. Annular groove
30. First holder
31. Cylindrical part
40. Fixing mechanism
50. Shading plate
60. Aperture diaphragm
70. Infrared filter
80. Lens barrel holder
90. Sealing ring
Detailed Description
Hereinafter, a lens unit according to an embodiment of the present invention will be described with reference to the accompanying drawings.
In the following description, "object side L1" and "image side L2" refer to an object side (hereinafter, also referred to as a front side) and an image side (hereinafter, also referred to as a rear side) in the optical axis L direction, and "optical axis direction" refers to a direction parallel to the optical axis L.
< Embodiment 1>
Fig. 1 is a side sectional view schematically showing the overall structure of a lens unit according to a first embodiment of the present invention, and fig. 2 is a side sectional view schematically showing the fixing structure of a first lens in the lens unit according to the first embodiment of the present invention.
As shown in fig. 1, the lens unit 1 has a plurality of lenses including a first lens 15, and a second lens 14 and a third lens 16 located on both sides of the first lens 15 in the optical axis direction and adjacent to the first lens 15, and a lens barrel 20 holding the plurality of lenses, the first lens 15 being held by the lens barrel 20 via a first holding frame 30 so as to be located on the inner peripheral side of a cylindrical portion 31 of the first holding frame 30. As shown in fig. 2, the first lens 15 has a shape that enables the position to be adjusted in a direction perpendicular to the optical axis direction in a state where the outer peripheral surface of the first lens 15 faces the inner peripheral surface of the cylindrical portion 31, and the first lens 15 is fixed to the first holder 30 via the fixing mechanism 40.
Here, the lens unit 1 includes seven lenses arranged in the optical axis direction, and is composed of a lens 11, a lens 12, a lens 13, a second lens 14, a first lens 15, a third lens 16, and a lens 17 in this order from the object side L1, a light shielding plate 50 is provided between the lens 12 and the lens 13, an aperture 60 is provided between the second lens 14 and the first lens 15, and an infrared filter 70 and an imaging element (not shown) are arranged at a position closer to the image side L2 than the lens 17. Specifically, the lens 11 has negative power (power), and the surface of the object side L1 is convex, and the (center portion of the) surface of the image side L2 is concave; the lens 12 has negative optical power, and the surface of the object side L1 is convex, and the (center portion of the) surface of the image side L2 is concave; the lens 13 has negative optical power, the surface of the object side L1 is concave, and the surface of the image side L2 is convex; the second lens 14 has positive optical power, and (the center portion of) the surface of the object side L1 is convex, and (the center portion of) the surface of the image side L2 is convex; the first lens 15 has positive optical power, and the surface of the object side L1 is convex, and the surface of the image side L2 is also convex; the third lens 16 has negative optical power, and (the center portion of) the surface of the object side L1 is concave, and (the center portion of) the surface of the image side L2 is also concave; the lens 17 has positive optical power, and (the center portion of) the surface of the object side L1 is convex, and (the center portion of) the surface of the image side L2 is also convex. In the present embodiment, the lens 11 and the first lens 15 are made of glass, the lens 12, the lens 13, the second lens 14, the third lens 16, and the lens 17 are made of resin, the surface of the first lens 15 on the object side L1 and the surface of the image side L2 are both spherical (i.e., the first lens 15 is a spherical lens), and the third lens 16 and the lens 17 are bonded to each other to become bonded lenses, but not limited thereto.
Further, the lens barrel 20 is made of, for example, resin, and its rear end is held by the lens barrel holder 80. Specifically, the lens barrel 20 includes a tubular main body portion 21 extending in the optical axis direction, an annular flange portion 22 that expands in diameter radially outward from a front end (i.e., an end portion on the object side L1) of the tubular main body portion 21, a large-diameter tubular portion 23 extending from an outer peripheral edge of the annular flange portion 22 toward the front side (i.e., the object side L1), and an annular bottom plate portion 24 protruding radially inward from a vicinity of a rear end (i.e., an end portion on the image side L2) of the tubular main body portion 21, and an annular step portion 25 is formed at a portion of the tubular main body portion 21 slightly forward of the annular bottom plate portion 24, and an annular groove 26 recessed from an end surface on the object side L1 toward the image side L2 is formed at a front side of the tubular main body portion 21. In the present embodiment, the surface of the image side L2 of the lens 11 is in contact with the surfaces of the object side L1 of the cylindrical body portion 21 and the annular flange portion 22, and the end portion (caulking portion) of the object side L1 of the large-diameter cylindrical portion 23 protrudes radially inward and is in contact with the lens 11 from the object side L1, thereby positioning the lens 11 in the optical axis direction; the surface of the image side L2 of the third lens 16 is in contact with the surface of the object side L1 of the annular step portion 25, and the first holder 30, the diaphragm 60, the second lens 14, the lens 13, and the lens 12 that hold the first lens 15 are stacked in this order on the front side of the third lens 16 positioned by the annular step portion 25, and the end portion of the object side L1 of the tubular main body portion 21 protrudes radially inward and is in contact with the lens 12 from the object side L1, whereby the lens 12, the lens 13, the second lens 14, the first lens 15, and the third lens 16 are positioned in the optical axis direction; the lens 17 is sandwiched between the third lens 16 and the annular bottom plate portion 24. In the present embodiment, an annular groove 27 recessed from the end surface of the object side L1 toward the image side L2 is formed on the front side of the annular flange 22, and a seal ring 90 is provided in the annular groove 27, and the seal ring 90 seals between the lens 11 and the annular flange 22; in the lens barrel 20, the infrared filter 70 is provided between the annular bottom plate portion 24 and the lens barrel holder 80, and is held at the rear end surface of the annular bottom plate portion 24.
Here, as shown in fig. 2, the fixing mechanism 40 is a fixing portion constituted by an adhesive layer connecting the first lens 15 and the first holder 30. Specifically, the first holder 30 has a cylindrical portion 31 having a circular inner peripheral surface and a protrusion 32 protruding from the surface of the object side L1 of the cylindrical portion 31 toward the object side L1 (for example, a plurality of protrusions are provided at equal angular intervals around the optical axis L), the protrusion 32 abuts (the outer peripheral portion of) the surface of the image side L2 of the second lens 14, the surface of the image side L2 of the cylindrical portion 31 abuts (the outer peripheral portion of) the surface of the object side L1 of the third lens 16, and thereby the first holder 30 is positioned in the optical axis direction; the outer peripheral surface of the first lens 15 is circular, has an outer diameter smaller than the inner diameter of the cylindrical portion 31, and is held on the inner peripheral side of the cylindrical portion 31 by an adhesive layer provided as the fixing mechanism 40 in the entire circumferential direction of the first lens 15.
An example of a method of holding the first lens 15 in the first holder 30 will be described below.
First, the first holder 30 is provided to a support base (not shown) with an annular spacer (not shown) interposed therebetween. Here, the annular spacer is a plate of a predetermined thickness made of, for example, stainless steel, and the surface portion of the support base for supporting the first holder 30 is made of, for example, a harder material than the first lens 15, and is subjected to, for example, mirror finishing.
Next, the first lens 15 is gripped, and the first lens 15 is moved to the inner peripheral side of the cylindrical portion 31 of the first holder 30.
Then, the position of the first lens 15 in the optical axis direction and the inclination with respect to the optical axis direction (i.e., the position with respect to the first holder 30) are adjusted.
Finally, an uncured adhesive (for example, but not limited to, a thermosetting resin or a photo-curable resin) is injected between the outer peripheral surface of the first lens 15 and the inner peripheral surface of the cylindrical portion 31 of the first holder 30, and the adhesive is cured to form an adhesive layer, thereby fixing the first lens 15 to the first holder 30.
According to the lens unit of the present embodiment, the first lens 15 has a shape that enables the position to be adjusted in the direction perpendicular to the optical axis direction in a state in which the outer peripheral surface of the first lens 15 is opposed to the inner peripheral surface of the cylindrical portion 31, and the first lens 15 is not directly pressed into the first holding frame 30 but is held by the first holding frame 30 via the fixing mechanism 40, so that the position and/or inclination of the first lens 15 in the optical axis direction can be adjusted, and then the first lens 15 can be fixed to the first holding frame 30 by the fixing mechanism 40, whereby the position and inclination of the first lens 15 can be easily held with high accuracy even when the first lens 15 of a small size is used in the middle of the optical system, and deterioration in optical performance and variation in optical performance of the lens unit 1 due to the presence of the first lens 15 can be avoided.
Further, according to the lens unit of the present embodiment, since the fixing mechanism 40 is a fixing portion constituted by the adhesive layer connecting the first lens 15 and the first holder 30, when assembling, after adjusting the position of the first lens 15 in the optical axis direction and/or the inclination with respect to the optical axis direction, it is only necessary to fill the uncured adhesive between the first lens 15 and the first holder 30 and cure it, and thereby it is possible to fix the first lens 15 to the first holder 30, whereby deterioration in optical performance and variation in optical performance of the lens unit 1 due to the presence of the first lens 15 can be easily avoided.
Further, according to the lens unit of the present embodiment, the fixing portion constituted by the adhesive layer is provided in the entire circumference of the first lens 15, and therefore, contributes to the balanced and stable fixing of the first lens 15 to the first holder 30.
Further, according to the lens unit of the present embodiment, the first holder 30 is in contact with the second lens 14 and the third lens 16 in the optical axis direction, and therefore, the position of the first lens 15 in the optical axis direction can be easily positioned by the first holder 30.
Further, according to the lens unit of the present embodiment, the first lens 15 is a spherical lens, and therefore, the first lens 15 is easy to manufacture, contributing to a reduction in manufacturing cost of the lens unit 1.
Further, according to the lens unit of the present embodiment, the first holder 30 has the cylindrical portion 31 having the circular inner peripheral surface, and the outer peripheral surface of the first lens 15 has the circular shape and has the outer diameter smaller than the inner diameter of the cylindrical portion 31, and is held on the inner peripheral side of the cylindrical portion 31, and therefore, when the position of the first lens 15 in the optical axis direction and/or the inclination with respect to the optical axis direction is adjusted, the first lens 15 is less likely to be caught by the cylindrical portion 31, and a gap for filling the adhesive layer can be easily secured between the cylindrical portion 31 of the first holder 30 and the first lens 15, contributing to improvement of the assembly efficiency.
< Second embodiment >
The lens unit of the second embodiment has substantially the same configuration as the lens unit of the first embodiment, and is different from the lens unit of the first embodiment in the fixing structure of the first lens, and therefore, the following description will be focused on the difference, and the description of other parts will be omitted.
Fig. 3 is a side cross-sectional view schematically showing a fixing structure of a first lens in a lens unit according to a second embodiment of the present invention.
As shown in fig. 3, in the present embodiment, the fixing mechanism 40A includes: a second holder 41A fitted to the first lens 15A (the structure of which is the same as that of the first lens 15 of the first embodiment), the second holder 41A having a shape capable of adjusting the position thereof in a direction perpendicular to the optical axis direction in a state in which the outer peripheral surface thereof is opposed to the inner peripheral surface of the cylindrical portion 31A of the first holder 30A; and a fixing portion constituted by an adhesive layer 42A connecting the second holder 41A and the first holder 30A. The second holder 41A has a cylindrical portion, and the first lens 15A is press-fitted into the inner peripheral side of the cylindrical portion of the second holder 41A.
Here, the first holder 30A includes: a cylindrical portion 31A having a circular inner peripheral surface; and a protrusion portion 33A protruding radially inward from an inner peripheral surface of the cylindrical portion 31A, the second holder 41A being located on an inner peripheral side of the cylindrical portion 31A and facing the protrusion portion 33A in the optical axis direction, the adhesive layer 42A being formed between the second holder 41A and the protrusion portion 33A and the cylindrical portion 31A (however, the adhesive layer 42A may be formed only between the second holder 41A and the protrusion portion 33A, or only between the second holder 41A and the cylindrical portion 31A). Although not shown, the first holder 30A may include the same projection as the projection 32 of the first holder 30 in the first embodiment.
Further, a clamped portion (e.g., a protrusion, a recess, a hole, or the like) to be clamped by the clamping mechanism may be formed on the second holder 41A.
An example of a method of holding the first lens 15A in the first holder 30A will be described below.
First, the first holder 30A is provided to a support base (not shown) with an annular spacer (not shown) interposed therebetween. Here, the annular spacer is a plate of a predetermined thickness made of, for example, stainless steel, and the surface portion of the support base for supporting the first holder 30A is made of, for example, a material harder than the first lens 15A, and is subjected to, for example, mirror finishing.
Next, the first lens 15A is fitted to the second holder 41A, the second holder 41A is gripped, and the first lens 15A is moved to the inner peripheral side of the cylindrical portion 31A of the first holder 30A.
Then, the position of the first lens 15A in the optical axis direction and the inclination with respect to the optical axis direction (i.e., the position with respect to the first holder 30A) are adjusted.
Finally, an uncured adhesive (for example, but not limited to, a thermosetting resin or a photo-curing resin) is injected between the outer peripheral surface and the front end surface of the second holder 41A and the inner peripheral surface of the cylindrical portion 31A of the first holder 30A and the rear end surface of the protruding portion 33A, and the adhesive is cured to form an adhesive layer, thereby fixing the first lens 15A to the first holder 30A.
According to the lens unit of the present embodiment, at the time of assembly, the first lens 15A can be fitted to the second holder 41A first, and then the position of the first lens 15A in the optical axis direction and/or the inclination with respect to the optical axis direction can be adjusted while holding the second holder 41A, so that the operation is convenient, the efficiency of the assembly work can be improved, and the contact operation to the first lens 15A can be reduced, and the possibility of abrasion, scratch, or the like of the first lens 15A during the assembly can be reduced, as compared with the case where the position adjustment or the like is performed by directly holding the first lens 15A.
Further, according to the lens unit of the present embodiment, by forming the clamped portion to be clamped by the clamping mechanism on the second holder 41A, at the time of assembling, after the first lens 15A is fitted to the second holder 41A, the second holder 41A to which the first lens 15A is fitted can be easily operated, contributing to improvement of the assembling work efficiency.
Further, according to the lens unit of the present embodiment, the second holder 41A can be easily fixed to the first holder 30A by the adhesive layer, as compared with the case where the first holder 30A does not include the protruding portion 33A.
The invention has been described above by way of example with reference to the accompanying drawings, it being apparent that the invention is not limited to the embodiments described above.
For example, in the above-described embodiment, the lens unit includes seven lenses arranged in the optical axis direction, but is not limited thereto, the number of lenses may be appropriately adjusted as needed, and the form of each lens included in the lens unit may also be appropriately adjusted as needed.
In the above embodiment, the adhesive layer was given as an example of the fixing portion, but the fixing portion may be constituted by a welded portion or a caulking portion (refer to a fixing method of the lens 11), or may be constituted by a combination of the adhesive layer, the welded portion, and the caulking portion.
In the second embodiment, the first lens 15A is fitted to the second holder 41A, but the present invention is not limited to this, and the second holder may be fixed to the first lens by other methods such as bonding, caulking, welding, and the like.
In the second embodiment, the first holder 30A has the protrusion 33A, but the present invention is not limited thereto, and the protrusion 33A may be omitted, and the second holder 41A may be provided with a protrusion protruding from the cylindrical portion thereof in the optical axis direction, and a fixing portion or the like may be formed between the cylindrical portion of the second holder 41A, the protrusion, and the first holder 30A, while the protrusion 33A is omitted.
In the above embodiment, the fixing portion is provided in the entire circumferential direction of the first lens, but the fixing portion is not limited to this and may be provided only in a part of the circumferential direction of the first lens.
Claims (7)
1. A lens unit having a plurality of lenses and a lens barrel holding the plurality of lenses, the plurality of lenses including a first lens and a second lens and a third lens located on both sides of and adjacent to the first lens in an optical axis direction, the first lens being held by the lens barrel via a first holding frame so as to be located on an inner peripheral side of a cylindrical portion of the first holding frame, characterized in that,
The first lens has a shape capable of adjusting a position in a direction perpendicular to an optical axis direction in a state where an outer peripheral surface of the first lens is opposed to an inner peripheral surface of the cylindrical portion,
The first lens is fixed on the first holding frame via a fixing mechanism,
The fixing mechanism includes:
A second holder fitted to the first lens, the second holder having a shape capable of adjusting a position in a direction perpendicular to an optical axis direction in a state where an outer peripheral surface of the second holder is opposed to an inner peripheral surface of the cylindrical portion of the first holder; and
A fixing portion connecting the second holder with the first holder, the fixing portion being at least one of an adhesive layer, a welding portion, and a caulking portion,
The first holder includes a projection projecting radially inward from an inner peripheral surface of the cylindrical portion,
The second holder is located on the inner peripheral side of the cylindrical portion and is opposed to the protruding portion in the optical axis direction,
The fixing portion is formed between the second holder and the protruding portion and between the second holder and the cylindrical portion.
2. The lens unit of claim 1, wherein,
The fixing portion is disposed in the entire circumferential direction of the first lens.
3. The lens unit of claim 1, wherein,
The second holder is formed with a clamped portion to be clamped by the clamping mechanism.
4. The lens unit of claim 1, wherein,
The first holder abuts the second lens and the third lens in the optical axis direction.
5. The lens unit of claim 1, wherein,
The first lens is a spherical lens made of glass.
6. The lens unit of claim 1, wherein,
The inner peripheral surface of the cylindrical portion and the outer peripheral surface of the first lens are respectively circular,
The first lens has an outer diameter smaller than an inner diameter of the cylindrical portion.
7. A method for manufacturing a lens unit having a plurality of lenses and a lens barrel holding the plurality of lenses, the plurality of lenses including a first lens and a second lens and a third lens located on both sides of and adjacent to the first lens in an optical axis direction, the first lens being held by the lens barrel via a first holding frame so as to be located on an inner peripheral side of a cylindrical portion of the first holding frame,
The first lens has a shape capable of adjusting a position in a direction perpendicular to an optical axis direction in a state where an outer peripheral surface of the first lens is opposed to an inner peripheral surface of the cylindrical portion,
After the position of the first lens in the optical axis direction and/or the inclination with respect to the optical axis direction is adjusted, the first lens is fixed to the first holding frame via a fixing mechanism,
The fixing mechanism includes:
A second holder fitted to the first lens, the second holder having a shape capable of adjusting a position in a direction perpendicular to an optical axis direction in a state where an outer peripheral surface of the second holder is opposed to an inner peripheral surface of the cylindrical portion of the first holder; and
A fixing portion connecting the second holder with the first holder, the fixing portion being at least one of an adhesive layer, a welding portion, and a caulking portion,
After the first lens is fitted to the second holder, the position of the first lens in the optical axis direction and/or the inclination with respect to the optical axis direction is adjusted while holding the second holder, and then the second holder is fixed to the first holder by the fixing portion,
The first holder includes a projection projecting radially inward from an inner peripheral surface of the cylindrical portion,
The second holder is located on the inner peripheral side of the cylindrical portion and is opposed to the protruding portion in the optical axis direction,
The fixing portion is formed between the second holder and the protruding portion and between the second holder and the cylindrical portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810295472.2A CN110320627B (en) | 2018-03-30 | 2018-03-30 | Lens unit and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810295472.2A CN110320627B (en) | 2018-03-30 | 2018-03-30 | Lens unit and method for manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110320627A CN110320627A (en) | 2019-10-11 |
| CN110320627B true CN110320627B (en) | 2024-06-18 |
Family
ID=68112445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810295472.2A Active CN110320627B (en) | 2018-03-30 | 2018-03-30 | Lens unit and method for manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110320627B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101493563A (en) * | 2008-01-23 | 2009-07-29 | 索尼株式会社 | Lens barrel and image pickup unit |
| CN103201665A (en) * | 2010-03-29 | 2013-07-10 | 柯尼卡美能达先进多层薄膜株式会社 | Image pickup optical system and optical adjustment method |
| CN208026967U (en) * | 2018-03-30 | 2018-10-30 | 日本电产三协（东莞）工机有限公司 | Lens unit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI221207B (en) * | 2000-07-17 | 2004-09-21 | Toshiba Corp | Optical lens unit having a mechanism for adjusting the focal point of the optical lens |
| JP4137449B2 (en) * | 2002-01-08 | 2008-08-20 | チノンテック株式会社 | Zoom lens barrel and camera device |
| JP6401933B2 (en) * | 2014-04-24 | 2018-10-10 | 日本電産サンキョー株式会社 | Lens unit and optical device |
-
2018
- 2018-03-30 CN CN201810295472.2A patent/CN110320627B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101493563A (en) * | 2008-01-23 | 2009-07-29 | 索尼株式会社 | Lens barrel and image pickup unit |
| CN103201665A (en) * | 2010-03-29 | 2013-07-10 | 柯尼卡美能达先进多层薄膜株式会社 | Image pickup optical system and optical adjustment method |
| CN208026967U (en) * | 2018-03-30 | 2018-10-30 | 日本电产三协（东莞）工机有限公司 | Lens unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110320627A (en) | 2019-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20210373283A1 (en) | Imaging lens unit and method for manufacturing the same | |
| US20060171046A1 (en) | Passively aligned optical elements | |
| JP6393046B2 (en) | Wide-angle lens unit | |
| JP4789564B2 (en) | Lens block manufacturing method and jig used therefor | |
| JP2013174670A (en) | Lens unit | |
| TW201541140A (en) | Lens module, method of manufacturing the same, and camera module including the same | |
| JP7107786B2 (en) | Lens unit and cemented lens | |
| JP2007163657A (en) | Photographic lens, and optical apparatus using photographic lens | |
| JP2011221243A (en) | Optical system lens and method for manufacturing the same | |
| WO2015156315A1 (en) | Lens securing method and lens assembly | |
| JP2016051076A (en) | Barrel and imaging device | |
| JP5467205B2 (en) | Optical lens | |
| JP7272755B2 (en) | IMAGING LENS UNIT AND MANUFACTURING METHOD THEREOF | |
| CN110320627B (en) | Lens unit and method for manufacturing the same | |
| JP2011221244A (en) | Lens assembly and assembling method for the same | |
| JP2007193270A (en) | Lens with cap and manufacturing method therefor | |
| JP2012002945A (en) | Lens barrel and lens barrel assembling method | |
| CN208026967U (en) | Lens unit | |
| KR20220076086A (en) | Lens assembly | |
| JP4471743B2 (en) | Lens unit, lens barrel unit and camera | |
| WO2019180799A1 (en) | Space ring, lens system, method for manufacturing space ring, and method for assembling lens system | |
| JP2006023668A (en) | Manufacturing method for combination lens and combination lens | |
| WO2023189574A1 (en) | Lens unit | |
| WO2023189575A1 (en) | Lens unit | |
| WO2024009880A1 (en) | Lens unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |