WO2011158745A1 - レンズ鏡胴およびレンズ鏡胴組立方法 - Google Patents

レンズ鏡胴およびレンズ鏡胴組立方法 Download PDF

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Publication number
WO2011158745A1
WO2011158745A1 PCT/JP2011/063344 JP2011063344W WO2011158745A1 WO 2011158745 A1 WO2011158745 A1 WO 2011158745A1 JP 2011063344 W JP2011063344 W JP 2011063344W WO 2011158745 A1 WO2011158745 A1 WO 2011158745A1
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WIPO (PCT)
Prior art keywords
lens
lenses
holding member
end side
rear end
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Application number
PCT/JP2011/063344
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English (en)
French (fr)
Japanese (ja)
Inventor
郁夫 滝
竜太 佐々木
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富士フイルム株式会社
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Publication of WO2011158745A1 publication Critical patent/WO2011158745A1/ja

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    • 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

Definitions

  • the present invention relates to a lens barrel and a lens barrel assembling method.
  • a lens barrel in which a plurality of lenses are housed in a lens frame is generally used for a camera-equipped mobile phone camera or a vehicle-mounted camera.
  • Devices equipped with this lens barrel are often used in environments where temperature and humidity change. For example, an in-vehicle camera is exposed to a high temperature or a low temperature. Therefore, this lens barrel is required to have very high reliability, that is, performance stability and durability under severe environmental conditions such as high temperature / low temperature and temperature shock.
  • the clearance between the lens outer diameter and the lens frame inner diameter in a lens barrel in which a plurality of lenses are housed in a lens frame is generally a clearance of 20 ⁇ m or less so as not to cause a decrease in optical performance due to lens misalignment after assembly. Tolerance management is performed so that
  • the lens is made of glass and the lens frame is made of ceramic
  • the lens when the lens is incorporated into the lens frame, the lens is inserted in a posture in which the center is shifted or tilted. There is a risk of rubbing. Then, considering that the tolerance is controlled so that the clearance between the lens outer diameter and the lens frame inner diameter is 20 ⁇ m or less, it is extremely difficult to avoid such rubbing. Since both the glass lens and the ceramic lens frame are hard materials, scraping occurs when they are rubbed, and the scraping residue adversely affects the optical performance in the assembled lens barrel. .
  • the present invention avoids the generation of scraped debris during assembly, and in the assembled lens barrel, a lens barrel and a lens in which optical performance is prevented from deteriorating due to the scraped debris.
  • An object of the present invention is to provide a lens barrel assembling method.
  • a first lens barrel of the lens barrel of the present invention that achieves the above object has a plurality of lenses and an inner wall and an outer wall that open to both the front end portion and the rear end portion in the optical axis direction.
  • a lens holding member that holds the plurality of lenses inside the inner wall, a hollow shape that is open to both the front end portion and the rear end portion in the optical axis direction, the inner surface, the outer surface, and the plurality
  • a rear end side lens pressing portion that presses a peripheral edge portion of the rear end side surface of the rear end side lens disposed on the rearmost end side of the lens, and the lens holding member is surrounded by the inner surface.
  • a lens frame that supports the front end side of the front end side lens that is disposed on the foremost end side of the plurality of lenses that are supported by the lens frame and supported by the lens holding member supported by the lens frame.
  • the front end and the rear end in the optical axis direction in the present invention distinguish one from the other at both ends in the optical axis direction. That is, the front end side and the rear end side include both cases corresponding to the subject side and the imaging side, and conversely, cases corresponding to the imaging side and the subject side, respectively.
  • the first lens barrel includes a plurality of lens holding members that are supported inside the lens frame and that hold a plurality of lenses inside the inner wall.
  • the lens and the lens frame have a hardness lower than the hardness of both. Therefore, according to the first lens barrel, at the time of assembling the lens barrel, the plurality of lenses and the lens frame are not rubbed, and the two are rubbed and scrapes are prevented from being generated. For this reason, it is possible to prevent the optical performance from being deteriorated due to the scraped residue.
  • the second lens barrel of the lens barrel of the present invention that achieves the above object opens to both the plurality of lenses, the front end portion and the rear end portion in the optical axis direction, and includes an inner wall and an outer wall.
  • a front-end-side lens covering portion that covers a peripheral portion of a front-end-side surface of the front-end-side lens of the front-end-side lens provided on the foremost-end side of the plurality of lenses, and is surrounded by the inner wall
  • a lens holding member that holds the plurality of lenses, a hollow shape that is open at both ends in the optical axis direction, and an inner surface, an outer surface, and a rear end side lens disposed on the rearmost end side of the plurality of lenses.
  • a rear-end-side lens pressing portion that presses a peripheral edge portion of the rear-end-side surface, a lens frame that supports the lens holding member inside the inner surface, and a lens frame that is supported by the lens frame.
  • the plurality of labels held by the lens holding member supported by A holding ring that presses a peripheral portion of the front end side surface of the front end side lens disposed on the foremost end side of the lens in a state where the front end side lens cover of the lens holding member is interposed.
  • the member has a hardness lower than both of the plurality of lenses and the lens frame.
  • the second lens barrel of the lens barrel of the present invention is supported inside the lens frame and is surrounded by the inner wall, like the first lens barrel described above.
  • the lens holding member that holds the plurality of lenses has a hardness lower than the hardness of both the plurality of lenses and the lens frame. Therefore, even when the second lens barrel is assembled, the plurality of lenses and the lens frame are not rubbed at the time of assembling the lens barrel. For this reason, it is possible to prevent the optical performance from being deteriorated due to the scraped residue.
  • the front end side lens is rotated when the pressing ring is attached to the lens frame, and the adjacent lens or the intervening member between the lenses. It is prevented from being rubbed and scratched (space ring, etc.).
  • the lens frame is preferably made of ceramic.
  • a gap that allows expansion and contraction of the lens holding member in the optical axis direction is formed at a position adjacent to the front or rear end of the lens holding member in the optical axis direction. preferable.
  • the lens holding member expands due to a change in ambient temperature, it is absorbed in the gap.
  • the lens holding member is preferably a resin member.
  • the effect of avoiding the generation of scraps is great.
  • the lens barrel of the present invention is preferably a configuration further including an interval ring disposed between adjacent lenses in the plurality of lenses and held by the lens holding member together with the plurality of lenses.
  • the position of each of the plurality of lenses in the optical axis direction can be determined reliably.
  • the lens holding member holds the plurality of lenses over the entire circumference in the circumferential direction.
  • a plurality of lenses can be reliably held inside the lens holding member surrounded by the inner wall.
  • the lens holding member includes a cylindrical portion that extends continuously around the front end side, and at least three extending portions that extend in the optical axis direction and the rear end side is intermittent in the circumferential direction. It is also preferable that at least a part of the plurality of lenses is held by the extending portion.
  • a plurality of lenses are held inside the lens holding member and the lens holding member is inserted into the lens frame. Excellent workability.
  • the lens holding member includes the cylindrical portion and the extending portion.
  • the lens frame extends on the inner surface of the lens frame in the direction of the optical axis. It is also preferable to have a concave groove that accommodates the extended portion of the lens holding member, and a ridge formed between the concave grooves, which are alternately formed.
  • a plurality of lenses are securely held.
  • a first lens barrel assembling method of the present invention that achieves the above object has an inner wall and an outer wall that open at both the front end portion and the rear end portion in the optical axis direction.
  • a plurality of lenses are held inside the inner wall of the lens holding member and are hollow at both the front end and the rear end in the optical axis direction, and have an inner surface, an outer surface, and the plurality of lenses.
  • the lens in a state in which the plurality of lenses are held in a lens frame having a rear end side lens pressing portion that presses a peripheral edge portion of the rear end side surface of the rear end side lens disposed on the rearmost end side
  • a pressing member that inserts a holding member and presses a peripheral edge portion of a front-end-side surface of a front-end side lens disposed on the foremost-end side of the plurality of lenses held by the lens holding member that is inserted into the lens frame. Attaching the ring to the lens frame That.
  • the first lens barrel assembling method of the lens barrel assembling method of the present invention by using a lens holding member having a hardness lower than both of the plurality of lenses and the lens frame, The lens and the lens frame are not rubbed, and it is avoided that the two are rubbed and scraped to generate debris. For this reason, in the assembled lens barrel, it is possible to prevent the optical performance from being deteriorated due to the scraped residue.
  • the first lens barrel assembling method is an assembling method in which a lens holding member in a state where a plurality of lenses are held is inserted into a lens frame. Rubbing due to insertion is avoided.
  • the second lens barrel assembly method of the lens barrel assembly method of the present invention that achieves the above object is a hollow shape that opens at both the front end portion and the rear end portion in the optical axis direction, and has an inner surface.
  • An optical axis direction in a lens frame having an outer surface and a rear end side lens pressing portion that presses a peripheral edge portion of a rear end side surface of the rear end side lens disposed on the rearmost end side of the plurality of lenses.
  • a lens holding member having an inner wall and an outer wall that is open at both the front end portion and the rear end portion is inserted, and the lens holding member inserted into the lens frame is surrounded by the inner wall.
  • a plurality of lenses are held, and a peripheral portion of a front end side surface of a front end side lens disposed on the foremost end side among the plurality of lenses held by the lens holding member inserted into the lens frame is pressed.
  • the presser ring is attached to the lens frame.
  • the second lens barrel assembling method of the lens barrel assembling method of the present invention by using a lens holding member having a hardness lower than both of the plurality of lenses and the lens frame, The lens and the lens frame are not rubbed, and it is avoided that the two are rubbed and scraped to generate debris. For this reason, in the assembled lens barrel, it is possible to prevent the optical performance from being deteriorated due to the scraped residue.
  • a third lens barrel assembling method of the lens barrel assembling method of the present invention that achieves the above-mentioned object opens at both the front end portion and the rear end portion in the optical axis direction, and includes an inner wall, an outer wall,
  • the plurality of lenses inside the lens holding member surrounded by the inner wall of a lens holding member having a front end side lens covering portion covering a peripheral portion of a front end side surface of a front end side lens disposed on the foremost end side of the plurality of lenses Is a hollow shape that is open at both ends in the optical axis direction, and is an inner surface, an outer surface, and a peripheral portion of the rear end side surface of the rear end side lens disposed on the rear end side of the plurality of lenses.
  • a lens holding member holding the plurality of lenses is inserted into a lens frame having a rear end side lens pressing portion that holds the lens, and the lens holding member inserted into the lens frame holds the lens holding member. Deployed on the forefront side of multiple lenses The peripheral portion of the front end surface of the end lens, the pressing ring for pressing while interposing the front side lens cover portion of the lens holding member, characterized in that attached to the lens frame.
  • the third lens barrel assembling method of the lens barrel assembling method of the present invention by using a lens holding member having a hardness lower than both of the lenses and the lens frame, The lens and the lens frame are not rubbed, and it is avoided that the two are rubbed and scraped to generate debris. For this reason, in the assembled lens barrel, it is possible to prevent the optical performance from being deteriorated due to the scraped residue. Further, when the holding ring is attached to the lens frame, the front end side lens is prevented from being rubbed and rubbed with an adjacent lens or an intervening member (such as a spacing ring) between the lenses.
  • the third lens barrel assembling method is an assembling method in which a lens holding member in a state where a plurality of lenses are held is inserted into the lens frame, it is excellent in assemblability and the lens is tilted. Rubbing due to insertion is avoided.
  • a lens barrel and a lens barrel assembly in which generation of scraps during assembly is avoided and optical performance is prevented from being deteriorated due to the scraps in the assembled lens barrel.
  • FIG. 1 is a perspective view showing a lens barrel 100, which is a first embodiment of the lens barrel of the present invention, as viewed obliquely from the subject side.
  • 2 is an exploded perspective view of the lens barrel 100 shown in FIG. 1
  • FIG. 3 is a longitudinal sectional view parallel to the optical axis direction of the lens barrel 100 shown in FIG.
  • the lens barrel 100 of the first embodiment includes four lenses 111, 112, 113, 114, three spacing rings 121, 122, 123, a lens holding member 130, A lens frame 140 and a pressing ring 150 are provided.
  • the four lenses 111, 112, 113, and 114 are glass lenses, and their optical axes are in order of the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114 from the imaging side. It is arranged to overlap.
  • Each of the lenses 111, 112, 113, and 114 has a disk shape, and the outer diameter (side surface) is not polished and has a slit surface of # 1000 or less. Since the side surface is a ground surface, adverse effects such as ghost are suppressed. The side surface is preferably # 300 or less for ease of processing.
  • These four lenses 111, 112, 113, and 114 correspond to an example of a plurality of lenses according to the present invention.
  • the subject side corresponds to an example of the front end side in the optical axis direction according to the present invention
  • the imaging side corresponds to an example of the rear end side in the optical axis direction according to the present invention
  • the first lens 111 of these four lenses 111, 112, 113, 114 corresponds to an example of the rear end side lens referred to in the present invention
  • the fourth lens 114 corresponds to the front end referred to in the present invention. This corresponds to an example of a side lens.
  • the three spacing rings 121, 122, 123 are arranged between adjacent lenses in the four lenses 111, 112, 113, 114. That is, the first spacing ring 121 is disposed between the first lens 111 and the second lens 112, the second spacing ring 122 is disposed between the second lens 112 and the third lens 113, and the third lens 113. A third spacing ring 123 is disposed between the first lens 114 and the fourth lens 114. Each of these three spacing rings 121, 122, 123 corresponds to an example of a spacing ring referred to in the present invention.
  • the lens holding member 130 is a resin member having a hardness lower than the hardness of both the four lenses 111, 112, 113, 114 and the lens frame 140.
  • the lens holding member 130 has a cylindrical shape, and has an inner wall 131 and an outer wall 132 that are open at both ends in the direction of arrow A, which is the optical axis direction.
  • Such a lens holding member 130 holds the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 around the entire circumference in the circumferential direction inside the inner wall 131.
  • the total length of the lens holding member 130 in the arrow A direction is shorter than the thicknesses of the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 arranged in an overlapping manner. Therefore, as shown in FIG. 3, a gap that allows the lens holding member 130 to expand and contract in the arrow A direction is formed at a position adjacent to the front end 133 in the arrow A direction that is the optical axis direction of the lens holding member 130. . Therefore, even if the lens holding member 130 expands due to a change in ambient temperature, it is absorbed in the gap.
  • Such a lens holding member 130 has a thickness of, for example, 2 mm or less, preferably 1 mm or less.
  • the lens holding member 130 corresponds to an example of the lens holding member referred to in the present invention.
  • the lens frame 140 is a porous ceramic member having a hardness higher than that of the four lenses 111, 112, 113, 114.
  • the lens frame 140 has a hollow shape opened at both ends in the direction of the arrow A, which is the optical axis direction, and has an inner surface 141 and an outer surface 142.
  • the lens frame 140 includes an imaging-side lens holder that holds down the peripheral portion 1111 of the imaging-side surface of the first lens 111 disposed on the most imaging side of the four lenses 111, 112, 113, and 114. Part 143.
  • Such a lens frame 140 supports the lens holding member 130 inside the inner surface 141.
  • This lens frame 140 corresponds to an example of a lens frame according to the present invention.
  • a member made of ceramic can be used for the spacing rings 121, 122, and 123 already described, as well as the lens frame 240, and resin or glass can also be used.
  • the holding ring 150 is a ceramic member made of the same material as the lens frame 140, for example, and has a substantially cylindrical shape, and one open end has a shape protruding toward the center of the cylinder. Further, the holding ring 150 is supported by the lens frame 140. More specifically, the presser ring 150 covers the end of the lens frame 140 on the subject side and is fixed to the lens frame 140.
  • the fixing ring 150 may be fixed to the lens frame 140 by adhesive fixing, or may be screw fixing by providing a thread on the inner periphery of the pressing ring 150 and the outer surface 142 of the lens frame 140. Also good.
  • the holding ring 150 is provided on the subject side of the fourth lens 114 arranged on the most subject side of the four lenses 111, 112, 113, 114 held by the lens holding member 130 supported by the lens frame 140.
  • the peripheral portion 1141 of the surface is pressed. That is, the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are sandwiched between the imaging side lens pressing portion 143 and the pressing ring 150 of the lens frame 140.
  • the presser ring 150 corresponds to an example of the presser ring according to the present invention.
  • the positions of the four lenses 111, 112, 113, 114 accommodated in the lens frame 140 in the direction of the arrow A, which is the optical axis direction, are the imaging side lens pressing portion. 143, three spacing rings 121, 122, 123 and a holding ring 150.
  • the hardness of the lenses 111, 112, 113, 114, the lens holding member 130, the lens frame 140, and the presser ring 150 will be described in more detail.
  • HV200 Vickers hardness
  • the lenses 111, 112, 113, and 114 are made of glass and have a hardness of HV300 to 800.
  • the lens frame 140 and the holding ring 150 are made of ceramic and have a hardness of HV2600 or less.
  • the hardness of the lens frame 140 and the holding ring 150 is preferably HV500 or more and 2600 or less from the viewpoint of impact resistance.
  • the hardness of the lens holding member 130 is HV100 or less.
  • the tensile elastic modulus of the lens holding member 130 is 100 GPa or less, more preferably 10 GPa or less.
  • the hardness of the lens holding member 130 is preferably HV 40 or less in order to increase the difference between the hardness of the lenses 111, 112, 113, 114 and the hardness of the lens frame 140.
  • the lens holding member 130 has a hardness of HV40 or less and a tensile elastic modulus of 10 GPa or less by adopting a resin as a material.
  • the hardness is expressed by the numerical value of Vickers hardness (HV), but this numerical value is almost equivalent also in Knoop hardness (Hk).
  • the outer diameter of each of the four lenses 111, 112, 113, 114 and the inner wall 131 of the lens holding member 130, and the outer wall 132 of the lens holding member 130 and the lens frame 140 are arranged.
  • the tolerance is controlled so that the clearance is, for example, 5 ⁇ m or more and 20 ⁇ m or less, preferably 10 ⁇ m or less.
  • the lens barrel 100 includes four lenses 111, 112, 113, 114, and three gaps, which are supported by an inner surface 141 of the lens frame 140 and surrounded by an inner wall 131.
  • the lens holding member 130 that holds the rings 121, 122, and 123 over the entire circumference is a resin member having hardness lower than the hardness of both the four lenses 111, 112, 113, 114 and the lens frame 140. Therefore, according to the lens barrel 100 of the first embodiment, when the lens barrel 100 is assembled, the four lenses 111, 112, 113, 114, the three spacing rings 121, 122, 123, and the lens frame 140 Is not rubbed, and both are rubbed and scraped to avoid generation of residue. For this reason, it is possible to prevent the optical performance from being deteriorated due to the scraped residue. A method for assembling the lens barrel 100 will be described later.
  • the lens holding member and the lens frame are different from the first embodiment described above.
  • FIG. 4 is a perspective view showing a lens barrel 200, which is a second embodiment of the lens barrel of the present invention, as seen obliquely from above the subject side.
  • 5 is a longitudinal sectional view parallel to the optical axis direction of the lens barrel 200 shown in FIG. 4
  • FIG. 6 is a longitudinal sectional view perpendicular to the optical axis direction of the lens barrel 200 shown in FIG. is there.
  • the lens barrel 200 of the second embodiment includes four lenses 111, 112, 113, 114, three spacing rings 121, 122, 123, a lens holding member 230, A lens frame 240 and a holding ring 150 are provided.
  • the lens holding member 230 is a resin member having a hardness lower than the hardness of both the four lenses 111, 112, 113, 114 and the lens frame 240.
  • the lens holding member 230 has an inner wall 231 and an outer wall 232 that are open at both ends in the direction of arrow A, which is the optical axis direction.
  • the lens holding member 230 includes a cylindrical tube portion 233 and three extending portions 234 that extend from three locations of the tube portion 233 side by side in the arrow A direction that is the optical axis direction. Further, the lens holding member 230 is disposed with the tube portion 233 facing the subject and the extending portion 234 facing the image forming side.
  • the lens holding member 230 has a shape in which the subject side is continuous over the entire circumference and the imaging side is intermittent in the circumferential direction of the cylindrical portion 233.
  • the lens holding member 230 can be said to have a cutout shape with respect to the cylindrical lens holding member 130 in the first embodiment.
  • among the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123, the first lens 111, the first spacing ring 121, The two lenses 112, the second interval ring 122, and the third lens 113 are held inside the extension portion 234 surrounded by the inner wall 231.
  • the third spacing ring 123 and the fourth lens 114 closer to the subject side are The cylindrical portion 233 is held over the entire circumference in the circumferential direction inside the inner wall 231.
  • the total length of the lens holding member 230 in the arrow A direction is shorter than the thicknesses of the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 that are arranged in an overlapping manner. Therefore, as shown in FIG.
  • a gap that allows the lens holding member 230 to expand and contract in the arrow A direction is formed at a position adjacent to the front end 235 in the arrow A direction that is the optical axis direction of the lens holding member 230. . Therefore, even if the lens holding member 230 expands due to a change in ambient temperature, it is absorbed in the gap.
  • a lens holding member 230 has a thickness of, for example, 2 mm or less, preferably 1 mm or less.
  • the lens holding member 230 corresponds to an example of the lens holding member referred to in the present invention.
  • the lens frame 240 is a ceramic member having a hardness higher than the hardness of both the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123.
  • the lens frame 240 has a hollow shape opened at both ends in the direction of the arrow A, which is the optical axis direction, and has an inner surface 241 and an outer surface 242.
  • the lens frame 240 is an imaging side lens holder that holds down the peripheral portion 1111 of the imaging side surface of the first lens 111 disposed on the most imaging side of the four lenses 111, 112, 113, 114. Part 243.
  • the lens frame 240 has three concave portions that accommodate the extending portions 234 of the lens holding member 230 that are formed in the lens frame 240 inner surface 241 so as to extend in the direction of arrow A, which is the optical axis direction, in the circumferential direction.
  • a groove 2411 and three protrusions 2412 formed between the three concave grooves 2411 are provided.
  • Such a lens frame 240 supports the lens holding member 230 inside the inner surface 241.
  • the lens frame 240 corresponds to an example of a lens frame according to the present invention.
  • the positions of the four lenses 111, 112, 113, 114 accommodated in the lens frame 240 in the direction of the arrow A, which is the optical axis direction, are the imaging side lens pressing portion. 243, three spacing rings 121, 122, 123, and a holding ring 150.
  • the outer diameter of each of the four lenses 111, 112, 113, 114 and the inner wall 231 of the lens holding member 230, and the outer wall 232 of the lens holding member 230 and the lens is controlled so that the clearance between the inner surface 241 of the frame 240 and the inner surface 241 of the frame 240 is, for example, a clearance of 5 ⁇ m or more and 20 ⁇ m or less, preferably 10 ⁇ m or less, so as not to cause a decrease in optical performance due to an axial deviation of the lens.
  • each of the four lenses 111, 112, 113, 114 is not in contact with the outer diameter of each of the four lenses 111, 112, 113, 114 and the protrusion 2412 of the inner surface 241 of the lens frame 240 when the lenses are inserted.
  • a clearance larger than the clearance between the outer diameter and the inner wall 231 of the lens holding member 230 is provided.
  • this clearance is set to, for example, 30 ⁇ m or less, and preferably 15 ⁇ m or less, to the extent that optical performance is not deteriorated due to lens axis misalignment or the like.
  • the lens barrel 200 according to the second embodiment is supported inside the lens frame 240 surrounded by the inner surface 241.
  • the lens barrel 200 includes four lenses 111, 112, 113, 114 and three spacing rings inside the inner wall 231.
  • the lens holding member 230 that holds 121, 122, 123 is a resin member having a hardness lower than the hardness of both the four lenses 111, 112, 113, 114 and the lens frame 240. Therefore, according to the lens barrel 200 of the second embodiment, when the lens barrel 200 is assembled, the four lenses 111, 112, 113, 114, the three spacing rings 121, 122, 123, the lens frame 240, Is not rubbed, and both are rubbed and scraped to avoid generation of residue.
  • the lens holding member 230 has a cylindrical portion 233 and three extending portions 234, and four lenses 111, 112, 113, 114, and three spacing rings 121. , 122, 123, the first lens 111, the first interval ring 121, the second lens 112, the second interval ring 122, and the third lens 113 closer to the imaging side are surrounded by the inner wall 231 in the extending portion 234. Since the lens barrel 200 is assembled, the four lenses 111, 112, 113, 114 and the three spacing rings 121, which are surrounded by the inner wall 231 of the lens holding member 230, are assembled.
  • the lens frame 240 has three concave grooves 2411 and three protrusions 2412 on the inner surface 241, four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are securely held. A method for assembling the lens barrel 200 will be described later.
  • the lens holding member is different from the first embodiment described above.
  • FIG. 7 is a longitudinal sectional view parallel to the optical axis direction of a lens barrel 300 which is a third embodiment of the lens barrel of the present invention.
  • the lens barrel 300 of the third embodiment includes four lenses 111, 112, 113, 114, three spacing rings 121, 122, 123, a lens holding member 330, and a lens frame 140. And a presser ring 150.
  • the lens holding member 330 is a resin member having a hardness lower than the hardness of both the four lenses 111, 112, 113, 114 and the lens frame 140.
  • the lens holding member 330 is cylindrical and has an inner wall 131 and an outer wall 132 that are open at both ends in the direction of the arrow A, which is the optical axis direction.
  • the lens holding member 330 is a subject-side lens cover portion 333 that covers a peripheral portion 1141 of the subject-side surface of the fourth lens 114 provided on the most subject side of the four lenses 111, 112, 113, and 114.
  • the total length of the lens holding member 330 in the direction of arrow A is shorter than the thickness of the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 that are arranged in an overlapping manner. Accordingly, a gap that allows the lens holding member 330 to expand and contract in the arrow A direction is formed at a position adjacent to the rear end 334 in the arrow A direction, which is the optical axis direction of the lens holding member 330. Therefore, even if the lens holding member 330 expands due to a change in ambient temperature, it is absorbed in the gap.
  • Such a lens holding member 330 has a thickness of, for example, 2 mm or less, preferably 1 mm or less.
  • the lens holding member 330 corresponds to an example of the lens holding member referred to in the present invention.
  • the holding ring 150 is a ceramic member made of the same material as the lens frame 140, for example, and has a substantially cylindrical shape, and one open end has a shape protruding toward the center of the cylinder. Further, the holding ring 150 is supported by the lens frame 140. More specifically, the presser ring 150 covers the end of the lens frame 140 on the subject side and is fixed to the lens frame 140.
  • the fixing ring 150 may be fixed to the lens frame 140 by adhesive bonding as described above, or a screw having a thread on the inner periphery of the pressing ring 150 and the outer surface 142 of the lens frame 140. It may be fixed.
  • the holding ring 150 is provided on the subject side of the fourth lens 114 arranged on the most subject side of the four lenses 111, 112, 113, 114 held by the lens holding member 130 supported by the lens frame 140.
  • the peripheral edge portion 1141 of this surface is pressed in a state where the subject side lens cover portion 333 of the lens holding member 330 is interposed.
  • the presser ring 150 corresponds to an example of the presser ring according to the present invention.
  • the positions of the four lenses 111, 112, 113, 114 accommodated in the lens frame 140 in the direction of the arrow A, which is the optical axis direction, are the imaging side lens pressing portion. 143, three spacing rings 121, 122, 123 and a holding ring 150.
  • the outer diameter of each of the four lenses 111, 112, 113, 114 and the inner wall 131 of the lens holding member 330, and the outer wall 132 of the lens holding member 330 and the lens is controlled between the inner surface 141 of the frame 140 and a clearance of, for example, 5 ⁇ m or more and 20 ⁇ m or less, and preferably 10 ⁇ m or less so as not to cause a decrease in optical performance due to an axial deviation of the lens.
  • the lens barrel 300 of the third embodiment is supported inside the lens frame 140 surrounded by the inner surface 141 and surrounded by the inner wall 131.
  • the lens holding member 330 that holds the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 over the entire circumference is both the four lenses 111, 112, 113, 114 and the lens frame 140.
  • This is a resin member having a hardness lower than that of the resin. Therefore, also in the lens barrel 300 of the third embodiment, when the lens barrel 300 is assembled, the four lenses 111, 112, 113, 114, the three spacing rings 121, 122, 123 and the lens frame 140 are formed.
  • the lens holding member 330 has a subject-side lens cover portion 333 that covers the peripheral portion 1141 of the subject-side surface of the fourth lens 114, and the holding ring 150 is The peripheral portion 1141 is pressed with the subject side lens cover 333 interposed. Therefore, according to the lens barrel 300 of the third embodiment, particularly when the presser ring 150 is fixed to the lens frame 140 by screwing, the presser ring 150 is assembled when the lens barrel 300 is assembled. When the lens is attached to the lens frame 140, the fourth lens 114 is prevented from rotating and rubbing against the adjacent spacing ring 123 to be damaged. A method for assembling the lens barrel 300 will be described later.
  • the first embodiment described below is an assembling method of the lens barrel 100 described with reference to FIGS.
  • This assembling method can be applied as the assembling method of the lens barrel 200 described with reference to FIGS. 4 to 6, but here, the assembling method of the lens barrel 100 will be described.
  • the components of the lens barrel 100 are denoted by the same reference numerals and description thereof is omitted, and only the method of assembling the lens barrel 100 (see FIGS. 1 to 3) will be described.
  • the lens holding member 130 is inserted into the lens frame 140.
  • the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are rotated in the direction surrounded by the inner wall 131 of the lens holding member 130 inserted in the lens frame 140. Hold all around.
  • the holding ring 150 is attached to the lens frame 140, and the peripheral portion 1141 of the subject side surface of the fourth lens 114 provided on the most subject side of the four lenses 111, 112, 113, 114 is pressed.
  • the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are sandwiched between the imaging side lens pressing portion 143 and the pressing ring 150 of the lens frame 140, and the lens frame Fixed within 140.
  • the lens holding member 130 is a resin member having a hardness lower than the hardness of both the four lenses 111, 112, 113, 114 and the lens frame 140, and thus the lens barrel assembly of the first embodiment.
  • the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 and the lens frame 140 are not rubbed. . For this reason, in the assembled lens barrel 100, it is possible to prevent the optical performance from being deteriorated due to shaving residue.
  • the second embodiment described below is an assembling method of the lens barrel 200 described with reference to FIGS.
  • This assembling method can also be applied as the assembling method of the lens barrel 100 described with reference to FIGS. 1 to 3, but here, the assembling method of the lens barrel 200 will be described.
  • each component of the lens barrel 200 will be denoted by the same reference numeral and description thereof will be omitted, and only an assembling method of the lens barrel 200 (see FIGS. 4 to 6) will be described.
  • the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are closer to the imaging side.
  • the first lens 111, the first interval ring 121, the second lens 112, the second interval ring 122, and the third lens 113 are held.
  • a third of the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 closer to the subject is located inside the cylindrical portion 233 of the lens holding member 230 surrounded by the inner wall 231.
  • the interval ring 123 and the fourth lens 114 are held over the entire circumference of the rotation direction.
  • the lens holding member 230 in a state in which the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are held in the lens frame 240 is inserted.
  • the holding ring 150 is attached to the lens frame 240, and the peripheral portion 1141 of the subject side surface of the fourth lens 114 provided on the most subject side of the four lenses 111, 112, 113, 114 is pressed.
  • the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are sandwiched between the imaging side lens pressing portion 243 and the pressing ring 150 of the lens frame 240, and the lens frame. Fixed within 240.
  • the lens holding member 230 is a resin member having hardness lower than the hardness of both the four lenses 111, 112, 113, 114 and the lens frame 240, the lens barrel assembly of the second embodiment. According to the method, the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 and the lens frame 240 are not rubbed. . For this reason, in the assembled lens barrel 200, it is possible to prevent the optical performance from being deteriorated due to the scraped residue.
  • the lens holding member 230 in a state in which the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are held in the lens frame 240. Since it is an assembling method to be inserted, it is excellent in assembling property, and rubbing due to the lens being inserted in an inclined posture is avoided. Furthermore, according to the lens barrel assembling method of the second embodiment, the optical performance is improved in a state in which the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are held by the lens holding member 230. It can also be confirmed. In this case, the trouble of adjusting the position of the lens while the lens holding member 230 is inserted into the lens frame 240 is avoided.
  • the lens barrel assembling method of the second embodiment includes the four lenses 111, 112, 113, 114 and the first lens 111 closer to the imaging side of the three spacing rings 121, 122, 123, the first spacing. Since the ring 121, the second lens 112, the second spacing ring 122, and the third lens 113 are held inside the extension wall 234 surrounded by the inner wall 231, the lens holding member 230 is surrounded by the inner wall 231. The workability when holding the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 or inserting the lens holding member 230 into the lens frame 240 is excellent.
  • the third embodiment described below is an assembling method of the lens barrel 300 described with reference to FIG.
  • the components of the lens barrel 300 are denoted by the same reference numerals and description thereof is omitted, and only the method of assembling the lens barrel 300 (see FIG. 7) will be described.
  • the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are held over the entire circumference in the circumferential direction inside the lens holding member 330 surrounded by the inner wall 131.
  • the lens holding member 330 in a state where the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are held in the lens frame 140 is inserted.
  • the holding ring 150 is attached to the lens frame 140, and the peripheral portion 1141 of the subject side surface of the fourth lens 114 provided on the most subject side of the four lenses 111, 112, 113, 114 is held by the lens.
  • the object 330 is pressed with the subject-side lens cover 333 interposed therebetween.
  • the lens holding member 330 is a resin member having hardness lower than the hardness of both the four lenses 111, 112, 113, 114 and the lens frame 140, the lens barrel assembly of the third embodiment.
  • the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 and the lens frame 140 are not rubbed. .
  • the pressing ring 150 may be fixed to the lens frame 140 by adhesion, or a screw formed by providing a thread on the inner periphery of the pressing ring 150 and the outer surface 142 of the lens frame 140.
  • the fixing may be fixed, in particular, when the fixing ring 150 is fixed to the lens frame 140 by screwing, the fourth lens 114 is rotated when the pressing ring 150 is attached to the lens frame 140. It is prevented that the adjacent spacing ring 123 is rubbed and damaged. More specifically, the contact area between the outer wall 132 of the lens holding member 330 and the inner surface 141 of the lens frame 140 is larger than the contact area between the subject-side lens cover 333 of the lens holding member 330 and the pressing ring 150. When the inner surface of the holding ring 150 is in contact with the front surface of the subject side lens cover 333 of the lens holding member 330, the lens holding member 330 does not rotate with the holding ring 150. Accordingly, at this time, the fourth lens 114 does not rotate with the holding ring 150.
  • the lens holding member 330 in a state where the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are held in the lens frame 140. Since it is an assembling method to be inserted, it is excellent in assembling property, and rubbing due to the lens being inserted in an inclined posture is avoided. Further, according to the lens barrel assembling method of the third embodiment, the optical performance is improved in a state where the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123 are held by the lens holding member 330. It can also be confirmed. In this case, the trouble of adjusting the position of the lens with the lens holding member 330 inserted into the lens frame 140 is avoided.
  • the example in which the plurality of lenses according to the present invention is four lenses has been described.
  • the plurality of lenses according to the present invention is not limited to this.
  • the lens holding member referred to in the present invention is described as an example of a resin member.
  • the lens holding member referred to in the present invention is not limited to this, and a lens and a lens. Any member may be used as long as it has a lower hardness than both of the frames.
  • a metal member such as copper, aluminum, or brass may be used.
  • extension portion referred to in the present invention is three has been described, but the extension portion referred to in the present invention is not limited to this, and at least three extension portions are referred to. I just need it.
  • the present invention is not limited to this,
  • the side may be the front end side in the present invention, and the subject side may be the rear end side in the present invention.
  • Lens barrel 111 First lens 1111 Peripheral part 112 Second lens 113 Third lens 114 Fourth lens 1141 Peripheral part 121 First spacing ring 122 Second spacing ring 123 Third spacing ring 130, 230, 330 Lens holding member 131, 231 Inner wall 132, 232 Outer wall 133, 235 Front end 233 Tube part 234 Extension part 333 Subject side lens cover part 334 Rear end 140, 240 Lens frame 141, 241 Inner surface 2411 Concave groove 2412 Projection 142, 242 Outer surface 143, 243 Image-side lens holding part 150 Holding ring

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
PCT/JP2011/063344 2010-06-15 2011-06-10 レンズ鏡胴およびレンズ鏡胴組立方法 WO2011158745A1 (ja)

Applications Claiming Priority (2)

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JP2010136442A JP2012002947A (ja) 2010-06-15 2010-06-15 レンズ鏡胴およびレンズ鏡胴組立方法
JP2010-136442 2010-06-15

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Publication number Priority date Publication date Assignee Title
JP5964709B2 (ja) * 2012-09-25 2016-08-03 京セラ株式会社 光学ユニット、撮像装置、および移動体
US8896943B2 (en) * 2013-03-14 2014-11-25 Himax Technologies Limited Lens assembly and method for assembling the same
JP2015169818A (ja) * 2014-03-07 2015-09-28 ウシオ電機株式会社 レンズユニット及びレーザ光源装置
EP4018908A1 (en) * 2020-12-22 2022-06-29 Ambu A/S An endoscope

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002090610A (ja) * 2000-09-12 2002-03-27 Olympus Optical Co Ltd 鏡筒装置
JP2005208579A (ja) * 2003-12-24 2005-08-04 Olympus Corp ズームレンズ鏡筒
JP2006292927A (ja) * 2005-04-08 2006-10-26 Matsushita Electric Ind Co Ltd レンズユニットとその製造方法
JP2009199072A (ja) * 2008-01-23 2009-09-03 Fujinon Corp レンズ装置
JP2010122557A (ja) * 2008-11-21 2010-06-03 Fujinon Corp 間隔環

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002090610A (ja) * 2000-09-12 2002-03-27 Olympus Optical Co Ltd 鏡筒装置
JP2005208579A (ja) * 2003-12-24 2005-08-04 Olympus Corp ズームレンズ鏡筒
JP2006292927A (ja) * 2005-04-08 2006-10-26 Matsushita Electric Ind Co Ltd レンズユニットとその製造方法
JP2009199072A (ja) * 2008-01-23 2009-09-03 Fujinon Corp レンズ装置
JP2010122557A (ja) * 2008-11-21 2010-06-03 Fujinon Corp 間隔環

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