WO2011158745A1 - Lens barrel and lens barrel assembly method - Google Patents

Lens barrel and lens barrel assembly method 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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WO
WIPO (PCT)
Prior art keywords
lens
lenses
holding member
end side
rear end
Prior art date
Application number
PCT/JP2011/063344
Other languages
French (fr)
Japanese (ja)
Inventor
郁夫 滝
竜太 佐々木
Original Assignee
富士フイルム株式会社
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Filing date
Publication date
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Publication of WO2011158745A1 publication Critical patent/WO2011158745A1/en

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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)

Abstract

Disclosed are a lens barrel and a lens barrel assembly method with which generation of cutting waste during assembly can be avoided and degradation of optical performance caused by cutting waste in the assembled lens barrel is prevented. A lens holding member (130) is supported in a lens frame (140) inner section surrounded by the inside surface (141) of the lens frame (140). The lens holding member (130) holds, in the inner section which is surrounded by an inside wall (131), four lenses (111, 112, 113 and 114) and three spacing rings (121, 122, and 123) across the entire circumference thereof in the circumferential direction. The lens holding member (130) is a member made from resin having a hardness that is lower than the hardness of both the four lenses (111, 112, 113 and 114) and the lens frame (140).

Description

レンズ鏡胴およびレンズ鏡胴組立方法Lens barrel and lens barrel assembling method
　本発明は、レンズ鏡胴およびレンズ鏡胴組立方法に関する。 The present invention relates to a lens barrel and a lens barrel assembling method.
　従来より、カメラ付き携帯電話のカメラや車載用カメラなどには、一般に、レンズ枠に複数のレンズが収容されたレンズ鏡胴が用いられている。このレンズ鏡胴が搭載された機器は、温度や湿度が変化する環境で使用されることが多い。例えば車載用カメラは、高温下にさらされたり低温下にさらされたりする。そのため、このレンズ鏡胴は、非常に高い信頼性、すなわち、高温・低温、温度ショックなど、厳しい環境条件下での性能安定性や耐久性が必要とされている。 Conventionally, 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.
　このようなレンズ鏡胴として、鏡筒内周面にある支持部とレンズの外周部との間にはんだを介在させ、鏡筒内を密封させる技術が提案されている（例えば、特許文献１参照。）。 As such a lens barrel, a technique has been proposed in which solder is interposed between the support portion on the inner peripheral surface of the lens barrel and the outer peripheral portion of the lens to seal the inside of the lens barrel (see, for example, Patent Document 1). .)
　また、このようなレンズ鏡胴として、鏡筒内周面の長手方向に所定間隔をおいて設けた支持部とレンズの外周部とを、酸素の共有結合により直接接合させる技術が提案されている（例えば、特許文献２参照。）。 Further, as such a lens barrel, a technique has been proposed in which a support portion provided at a predetermined interval in the longitudinal direction of the inner peripheral surface of the lens barrel and the outer peripheral portion of the lens are directly joined by a covalent bond of oxygen. (For example, refer to Patent Document 2).
　また、近年、このようなレンズ鏡胴として、不要な光を遮光することができるとともに、通気性を有し、温度変化や湿度変化の影響をほとんど受けることのない、セラミック製のレンズ枠が注目を受けてきている（例えば、特許文献１，２，３参照。）。 In recent years, as such a lens barrel, a ceramic lens frame that can block unnecessary light, has air permeability, and is hardly affected by changes in temperature and humidity has attracted attention. (For example, see Patent Documents 1, 2, and 3).
　また、所定の口径をなす開口絞りを画定するとともに、鏡筒の内周面に嵌入されかつ２つのレンズ間に介在させられて光軸方向の間隔を規定する環状スペーサを備えたレンズ鏡胴が提案されている（例えば、特許文献４参照。）。 And a lens barrel having an annular spacer that defines an aperture stop having a predetermined diameter and that is inserted into the inner peripheral surface of the lens barrel and interposed between the two lenses to define an interval in the optical axis direction. It has been proposed (see, for example, Patent Document 4).
特開２００６－２８４９９１号公報JP 2006-284991 A 特開２００６－２９２９２７号公報JP 2006-292927 A 特開２００７－２３８４３０号公報JP 2007-238430 A 特開２００７－２７９５５７号公報JP 2007-279557 A
　レンズ枠に複数のレンズが収容されたレンズ鏡胴におけるレンズ外径とレンズ枠内径との間は、組立後にレンズの軸ズレなどによる光学性能の低下を起さないよう、一般に、２０μｍ以下のクリアランスとなるように公差管理されている。 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 μm or less so as not to cause a decrease in optical performance due to lens misalignment after assembly. Tolerance management is performed so that
　例えば、レンズがガラス製でありレンズ枠がセラミック製である場合には、レンズをレンズ枠に組み込む際に、芯がずれたり傾いたりした姿勢でレンズが挿入されることに起因して、両者が擦れるおそれがある。そして、レンズ外径とレンズ枠内径との間のクリアランスが２０μｍ以下となるように公差管理されていることを考慮すると、そのような擦れを回避することは極めて困難である。ガラス製のレンズとセラミック製のレンズ枠は、双方ともに硬い材料であるため、両者が擦れると削れカスが発生し、組み立てられたレンズ鏡胴において、削れカスが光学性能に悪影響を与えることとなる。 For example, if the lens is made of glass and the lens frame is made of ceramic, 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 μm 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. .
　本発明は、上記事情に鑑み、組み立て時に削れカスが発生することが回避され、組み立てられたレンズ鏡胴において、削れカスに起因して光学性能が悪化することが防止されたレンズ鏡胴およびレンズ鏡胴組立方法を提供することを目的とするものである。 In view of the above circumstances, 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.
　上記目的を達成する本発明のレンズ鏡胴のうちの第１のレンズ鏡胴は、複数のレンズと、光軸方向前端部と後端部との双方に開口して内壁と外壁とを有し、この内壁に囲まれた内部に上記複数のレンズを保持するレンズ保持部材と、光軸方向前端部と後端部との双方に開口した中空形状であって、内面と、外面と、上記複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有し、この内面に囲まれた内部に上記レンズ保持部材を支持するレンズ枠と、上記レンズ枠に支持され、このレンズ枠に支持された上記レンズ保持部材に保持された上記複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を押さえる押さえ環とを備え、上記レンズ保持部材が、上記複数のレンズおよび上記レンズ枠双方の硬度よりも低い硬度を有するものであることを特徴とする。 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. A holding ring for holding the peripheral portion of the surface, and the lens holding portion But wherein the one having a lower hardness than the plurality of lenses and hardness of the lens frame both.
　ここで、本発明における光軸方向前端および後端は、光軸方向両端の一方と他方を区別するものである。つまり、前端側および後端側は、被写体側および結像側にそれぞれ対応する場合と、この逆に、結像側および被写体側にそれぞれ対応する場合との双方を含む意味である。 Here, 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.
　本発明のレンズ鏡胴のうちの第１のレンズ鏡胴は、レンズ枠の内面に囲まれた内部に支持された、内壁に囲まれた内部に複数のレンズを保持するレンズ保持部材が、複数のレンズおよびレンズ枠双方の硬度よりも低い硬度を有するものである。従って、この第１のレンズ鏡胴によれば、このレンズ鏡胴の組み立て時において、複数のレンズとレンズ枠とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、削れカスに起因して光学性能が悪化することが防止される。 Among the lens barrels of the present invention, 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.
　また、上記目的を達成する本発明のレンズ鏡胴のうちの第２のレンズ鏡胴は、複数のレンズと、光軸方向前端部と後端部との双方に開口し、内壁と、外壁と、上記複数のレンズのうちの最前端側に配備される前端側レンズの前端側レンズの前端側の面の周縁部分を覆う前端側レンズ覆い部とを有し、この内壁に囲まれた内部に上記複数のレンズを保持するレンズ保持部材と、光軸方向両端に開口した中空形状であって、内面と、外面と、上記複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有し、この内面に囲まれた内部に上記レンズ保持部材を支持するレンズ枠と、上記レンズ枠に支持され、このレンズ枠に支持された上記レンズ保持部材に保持された上記複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を、上記レンズ保持部材の前端側レンズ覆い部を介在させた状態で押さえる押さえ環とを備え、上記レンズ保持部材が、上記複数のレンズおよび上記レンズ枠双方の硬度よりも低い硬度を有するものであることを特徴とする。 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.
　本発明のレンズ鏡胴のうちの第２のレンズ鏡胴は、上述した第１のレンズ鏡胴と同様に、レンズ枠の内面に囲まれた内部に支持された、内壁に囲まれた内部に複数のレンズを保持するレンズ保持部材が、複数のレンズおよびレンズ枠双方の硬度よりも低い硬度を有するものである。従って、この第２のレンズ鏡胴によっても、このレンズ鏡胴の組み立て時において、複数のレンズとレンズ枠とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、削れカスに起因して光学性能が悪化することが防止される。 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.
　また、この第２のレンズ鏡胴によれば、このレンズ鏡胴の組み立て時において、押さえ環をレンズ枠に取り付けるときに前端側レンズが供回りして隣接するレンズあるいはレンズとの間の介在部材（間隔環等）と擦れて傷付くことが防止される。 Further, according to the second lens barrel, when the lens barrel is assembled, 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.).
　ここで、本発明のレンズ鏡胴は、上記レンズ枠が、セラミック製であることが好ましい。 Here, in the lens barrel of the present invention, the lens frame is preferably made of ceramic.
　このような好ましい形態によれば、削れカスに起因して光学性能が悪化することが防止されるとともに、レンズ枠が受ける温度変化や湿度変化の影響が抑えられる。 According to such a preferable embodiment, it is possible to prevent the optical performance from being deteriorated due to the scraped residue, and to suppress the influence of the temperature change and the humidity change that the lens frame receives.
　また、本発明のレンズ鏡胴は、上記レンズ保持部材の光軸方向前端又は後端に隣接した位置に、そのレンズ保持部材の光軸方向への伸縮を許容する隙間が形成されていることが好ましい。 In the lens barrel of the present invention, 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.
　このような好ましい形態によれば、周囲の温度変化を受けてレンズ保持部材が膨張したとしても、その隙間で吸収される。 According to such a preferable form, even if the lens holding member expands due to a change in ambient temperature, it is absorbed in the gap.
　また、本発明のレンズ鏡胴は、上記レンズ保持部材が、樹脂製部材であることも好ましい形態である。 In the lens barrel of the present invention, the lens holding member is preferably a resin member.
　このような好ましい形態によれば、削れカスの発生を回避する効果が大きい。 According to such a preferable embodiment, the effect of avoiding the generation of scraps is great.
　また、本発明のレンズ鏡胴は、上記複数のレンズにおける隣接するレンズ間に配置されてそれら複数のレンズとともに上記レンズ保持部材に保持された間隔環をさらに備えたことも好ましい形態である。 In addition, 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.
　このような好ましい形態によれば、複数のレンズそれぞれの光軸方向の位置が確実に決められる。 According to such a preferable embodiment, the position of each of the plurality of lenses in the optical axis direction can be determined reliably.
　また、本発明のレンズ鏡胴は、上記レンズ保持部材が、上記複数のレンズを周回方向全周にわたって保持するものであることも好ましい形態である。 In the lens barrel of the present invention, it is also preferable that the lens holding member holds the plurality of lenses over the entire circumference in the circumferential direction.
　このような好ましい形態によれば、レンズ保持部材の内壁に囲まれた内部に複数のレンズを確実に保持させることができる。 According to such a preferable embodiment, a plurality of lenses can be reliably held inside the lens holding member surrounded by the inner wall.
　また、本発明のレンズ鏡胴は、上記レンズ保持部材が、前端側に一周にわたって連続する筒部と、後端側が周回方向に断続し光軸方向に延在した少なくとも３本の延在部とを有し、上記複数のレンズのうちの少なくとも一部のレンズは上記延在部に保持されたものであることも好ましい形態である。 In the lens barrel of the present invention, 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.
　このような好ましい形態によれば、レンズ鏡胴の組み立て時において、レンズ保持部材の内壁に囲まれた内部に複数のレンズを保持させたり、レンズ枠内にレンズ保持部材を挿入したりするときの作業性に優れる。 According to such a preferred embodiment, when the lens barrel is assembled, a plurality of lenses are held inside the lens holding member and the lens holding member is inserted into the lens frame. Excellent workability.
　さらに、本発明のレンズ鏡胴のうちの上記レンズ保持部材が上記筒部と上記延在部とを有するレンズ鏡胴は、上記レンズ枠が、そのレンズ枠内面に、光軸方向に延び周回方向に交互に形成された、上記レンズ保持部材の上記延在部を収容する凹溝と、その凹溝同士の間に形成された突条とを有するものであるという形態も好ましい。 Furthermore, in the lens barrel of the lens barrel according to the present invention, the lens holding member includes the cylindrical portion and the extending portion. In the lens barrel, 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.
　このような好ましい形態によれば、複数のレンズが確実に保持される。 According to such a preferable form, a plurality of lenses are securely held.
　また、上記目的を達成する本発明のレンズ鏡胴組立方法のうちの第１のレンズ鏡胴組立方法は、光軸方向前端部と後端部との双方に開口して内壁と外壁とを有するレンズ保持部材のこの内壁に囲まれた内部に複数のレンズを保持させ、光軸方向前端部と後端部との双方に開口した中空形状であって、内面と、外面と、上記複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有するレンズ枠内に、この複数のレンズを保持させた状態のレンズ保持部材を挿入し、上記レンズ枠内に挿入された上記レンズ保持部材に保持された上記複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を押さえる押さえ環を上記レンズ枠に取り付けることを特徴とする。 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.
　本発明のレンズ鏡胴組立方法のうちの第１のレンズ鏡胴組立方法によれば、レンズ保持部材として複数のレンズおよびレンズ枠双方の硬度よりも低い硬度を有するものを用いることにより、複数のレンズとレンズ枠とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、組み立てられたレンズ鏡胴において、削れカスに起因して光学性能が悪化することが防止される。また、この第１のレンズ鏡胴組立方法は、複数のレンズを保持させた状態のレンズ保持部材をレンズ枠内に挿入する組立方法であるため、組立性に優れるとともに、傾いた姿勢でレンズが挿入されることによる擦れが回避される。 According to 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. In addition, 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.
　また、上記目的を達成する本発明のレンズ鏡胴組立方法のうちの第２のレンズ鏡胴組立方法は、光軸方向前端部と後端部との双方に開口した中空形状であって、内面と、外面と、複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有するレンズ枠内に、光軸方向前端部と後端部との双方に開口して内壁と外壁とを有するレンズ保持部材を挿入し、上記レンズ枠内に挿入された状態の上記レンズ保持部材の上記内壁に囲まれた内部に上記複数のレンズを保持させ、上記レンズ枠内に挿入された上記レンズ保持部材に保持された上記複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を押さえる押さえ環を上記レンズ枠に取り付けることを特徴とする。 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. To.
　本発明のレンズ鏡胴組立方法のうちの第２のレンズ鏡胴組立方法によれば、レンズ保持部材として複数のレンズおよびレンズ枠双方の硬度よりも低い硬度を有するものを用いることにより、複数のレンズとレンズ枠とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、組み立てられたレンズ鏡胴において、削れカスに起因して光学性能が悪化することが防止される。 According to 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.
　また、上記目的を達成する本発明のレンズ鏡胴組立方法のうちの第３のレンズ鏡胴組立方法は、光軸方向前端部と後端部との双方に開口し、内壁と、外壁と、複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を覆う前端側レンズ覆い部とを有するレンズ保持部材のこの内壁に囲まれた内部に上記複数のレンズを保持させ、光軸方向両端に開口した中空形状であって、内面と、外面と、上記複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有するレンズ枠内に、この複数のレンズを保持させた状態のレンズ保持部材を挿入し、上記レンズ枠内に挿入された上記レンズ保持部材に保持された上記複数のレンズのうちの最前端側に配備された前端側レンズの前端側の面の周縁部分を、上記レンズ保持部材の前端側レンズ覆い部を介在させた状態で押さえる押さえ環を上記レンズ枠に取り付けることを特徴とする。 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.
　本発明のレンズ鏡胴組立方法のうちの第３のレンズ鏡胴組立方法によれば、レンズ保持部材として複数のレンズおよびレンズ枠双方の硬度よりも低い硬度を有するものを用いることにより、複数のレンズとレンズ枠とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、組み立てられたレンズ鏡胴において、削れカスに起因して光学性能が悪化することが防止される。また、押さえ環をレンズ枠に取り付けるときに前端側レンズが供回りして隣接するレンズあるいはレンズとの間の介在部材（間隔環等）と擦れて傷付くことが防止される。さらに、この第３のレンズ鏡胴組立方法は、複数のレンズを保持させた状態のレンズ保持部材をレンズ枠内に挿入する組立方法であるため、組立性に優れるとともに、傾いた姿勢でレンズが挿入されることによる擦れが回避される。 According to 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. Furthermore, since 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.
　本発明によれば、組み立て時に削れカスが発生することが回避され、組み立てられたレンズ鏡胴において、削れカスに起因して光学性能が悪化することが防止されたレンズ鏡胴およびレンズ鏡胴組立方法が提供される。 According to the present invention, 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. A method is provided.
本発明のレンズ鏡胴の第１実施形態であるレンズ鏡胴を被写体側斜め上から見て示した斜視図である。It is the perspective view which showed the lens barrel which is 1st Embodiment of the lens barrel of this invention seeing from the to-be-photographed object side diagonally. 図１に示すレンズ鏡胴の分解斜視図である。It is a disassembled perspective view of the lens barrel shown in FIG. 図１に示すレンズ鏡胴の光軸方向と平行な縦断面図である。It is a longitudinal cross-sectional view parallel to the optical axis direction of the lens barrel shown in FIG. 本発明のレンズ鏡胴の第２実施形態であるレンズ鏡胴を被写体側斜め上から見て示した斜視図である。It is the perspective view which showed the lens barrel which is 2nd Embodiment of the lens barrel of this invention seeing from the to-be-photographed object side diagonally. 図４に示すレンズ鏡胴の光軸方向と平行な縦断面図である。It is a longitudinal cross-sectional view parallel to the optical axis direction of the lens barrel shown in FIG. 図４に示すレンズ鏡胴の光軸方向と直角な縦断面図である。It is a longitudinal cross-sectional view orthogonal to the optical axis direction of the lens barrel shown in FIG. 本発明のレンズ鏡胴の第３実施形態であるレンズ鏡胴の光軸方向と平行な縦断面図である。It is a longitudinal cross-sectional view parallel to the optical axis direction of the lens barrel which is 3rd Embodiment of the lens barrel of this invention.
　以下、図面を参照して本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１は、本発明のレンズ鏡胴の第１実施形態であるレンズ鏡胴１００を被写体側斜め上から見て示した斜視図である。また、図２は、図１に示すレンズ鏡胴１００の分解斜視図であり、図３は、図１に示すレンズ鏡胴１００の光軸方向と平行な縦断面図である。 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, and FIG. 3 is a longitudinal sectional view parallel to the optical axis direction of the lens barrel 100 shown in FIG.
　図１～図３に示すように、第１実施形態のレンズ鏡胴１００は、４つのレンズ１１１，１１２，１１３，１１４と、３つの間隔環１２１，１２２，１２３と、レンズ保持部材１３０と、レンズ枠１４０と、押さえ環１５０とを備えている。 As shown in FIGS. 1 to 3, 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.
　４つのレンズ１１１，１１２，１１３，１１４は、それぞれガラス製のレンズであって、結像側から第１レンズ１１１、第２レンズ１１２、第３レンズ１１３、第４レンズ１１４の順に、光軸が重なるよう配置されている。各レンズ１１１，１１２，１１３，１１４は円盤形であり、外径（側面）は研磨されておらず、＃１０００以下のスリ面とされている。側面がスリ面であることによってゴーストなどの悪影響が抑えられる。側面のスリ面は、加工の容易さから＃３００以下であることが好ましい。これら４つのレンズ１１１，１１２，１１３，１１４が、本発明にいう複数のレンズの一例に相当するものである。また、被写体側が本発明にいう光軸方向前端側の一例に相当し、結像側が本発明にいう光軸方向後端側の一例に相当する。また、これら４つのレンズ１１１，１１２，１１３，１１４のうちの第１レンズ１１１が、本発明にいう後端側レンズの一例に相当するものであり、第４レンズ１１４が、本発明にいう前端側レンズの一例に相当するものである。 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, and 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, and the fourth lens 114 corresponds to the front end referred to in the present invention. This corresponds to an example of a side lens.
　３つの間隔環１２１，１２２，１２３は、４つのレンズ１１１，１１２，１１３，１１４における隣接するレンズ間に配置されている。すなわち、第１レンズ１１１と第２レンズ１１２との間に第１間隔環１２１が配置され、第２レンズ１１２と第３レンズ１１３との間に第２間隔環１２２が配置され、第３レンズ１１３と第４レンズ１１４との間に第３間隔環１２３が配置されている。これら３つの間隔環１２１，１２２，１２３のそれぞれが、本発明にいう間隔環の一例に相当するものである。 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.
　レンズ保持部材１３０は、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠１４０双方の硬度よりも低い硬度を有する樹脂製部材である。また、このレンズ保持部材１３０は、円筒状であり、光軸方向である矢印Ａ方向両端に開口して内壁１３１と外壁１３２とを有する。このようなレンズ保持部材１３０は、内壁１３１に囲まれた内部に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を周回方向全周にわたって保持している。また、レンズ保持部材１３０の矢印Ａ方向全長は、重ねて配置された４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３の厚みよりも短い。従って、図３に示すように、レンズ保持部材１３０の光軸方向である矢印Ａ方向前端１３３に隣接した位置に、レンズ保持部材１３０の矢印Ａ方向への伸縮を許容する隙間が形成されている。そのため、周囲の温度変化を受けてレンズ保持部材１３０が膨張したとしても、その隙間で吸収される。このようなレンズ保持部材１３０は、例えば２ｍｍ以下、好ましくは１ｍｍ以下の厚さを有する。このレンズ保持部材１３０が、本発明にいうレンズ保持部材の一例に相当するものである。 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.
　レンズ枠１４０は、４つのレンズ１１１，１１２，１１３，１１４の硬度よりも高い硬度を有する多孔質のセラミック製部材である。また、このレンズ枠１４０は、光軸方向である矢印Ａ方向両端に開口した中空形状であって、内面１４１と、外面１４２とを有する。また、このレンズ枠１４０は、４つのレンズ１１１，１１２，１１３，１１４のうちの最結像側に配備される第１レンズ１１１の結像側の面の周縁部分１１１１を押さえる結像側レンズ押さえ部１４３を有する。このようなレンズ枠１４０は、内面１４１に囲まれた内部にレンズ保持部材１３０を支持している。このレンズ枠１４０が、本発明にいうレンズ枠の一例に相当するものである。尚、すでに説明した間隔環１２１，１２２，１２３には、レンズ枠２４０と同様にセラミック製の部材が採用可能であり、また、樹脂やガラスも採用可能である。 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. In addition, 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. In addition, 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.
　押さえ環１５０は、例えばレンズ枠１４０と同じ材質であるセラミック製部材であり、概略筒状であり、一方の開口端は筒の中央に向かって張り出した形状を有している。また、この押さえ環１５０は、レンズ枠１４０に支持されている。より詳細には、押さえ環１５０はレンズ枠１４０の被写体側の端に被さり、レンズ枠１４０に固定されている。尚、押さえ環１５０のレンズ枠１４０への固定は、接着固定であってもよく、あるいは、押さえ環１５０の内周およびレンズ枠１４０の外面１４２にねじ山を設けてなるねじ止め固定であってもよい。また、この押さえ環１５０は、レンズ枠１４０に支持されたレンズ保持部材１３０に保持された４つのレンズ１１１，１１２，１１３，１１４のうちの最被写体側に配備される第４レンズ１１４の被写体側の面の周縁部分１１４１を押さえている。つまり、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３は、レンズ枠１４０の結像側レンズ押さえ部１４３と押さえ環１５０との間に挟み付けられている。この押さえ環１５０が、本発明にいう押さえ環の一例に相当するものである。 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.
　このように構成されたレンズ鏡胴１００では、レンズ枠１４０内に収容された４つのレンズ１１１，１１２，１１３，１１４の、光軸方向である矢印Ａ方向の位置が、結像側レンズ押さえ部１４３、３つの間隔環１２１，１２２，１２３、および押さえ環１５０によって決められている。 In the lens barrel 100 configured in this way, 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.
　ここで、レンズ１１１，１１２，１１３，１１４、レンズ保持部材１３０、レンズ枠１４０、および押さえ環１５０の硬度についてより詳細に説明する。レンズ１１１，１１２，１１３，１１４の硬度とレンズ保持部材１３０の硬度との間には、ビッカース硬度（ＨＶ）２００以上の硬度差があり、レンズ枠１４０および押さえ環１５０の硬度とレンズ保持部材１３０の硬度との間にはＨＶ２００以上の硬度差がある。より詳細には、レンズ１１１，１１２，１１３，１１４はガラス製であり、硬度はＨＶ３００以上８００以下である。また、レンズ枠１４０および押さえ環１５０はセラミック製であり、硬度はＨＶ２６００以下である。レンズ枠１４０および押さえ環１５０の硬度は耐衝撃性の観点からＨＶ５００以上２６００以下であることが好ましい。また、レンズ保持部材１３０の硬度は、ＨＶ１００以下である。また、レンズ保持部材１３０の引張り弾性係数は１００ＧＰａ以下、更に好ましくは１０ＧＰａ以下である。レンズ保持部材１３０の硬度は、レンズ１１１，１１２，１１３，１１４の硬度との差およびレンズ枠１４０の硬度との差を高めるため、ＨＶ４０以下であることが好ましい。レンズ保持部材１３０は、材料として樹脂を採用することにより、硬度がＨＶ４０以下であり、引張り弾性係数が１０ＧＰａ以下である。尚、ここでは、ビッカース硬度（ＨＶ）の数値によって硬度を表しているが、この数値は、ヌープ硬さ（Ｈｋ）においてもほぼ同等である。 Here, 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. There is a hardness difference of Vickers hardness (HV) 200 or more between the hardness of the lenses 111, 112, 113, 114 and the hardness of the lens holding member 130, and the hardness of the lens frame 140 and the holding ring 150 and the lens holding member 130. There is a hardness difference of HV200 or more between the hardness and the hardness. More specifically, 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. Further, 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. Here, the hardness is expressed by the numerical value of Vickers hardness (HV), but this numerical value is almost equivalent also in Knoop hardness (Hk).
　このように構成されたレンズ鏡胴１００において、４つのレンズ１１１，１１２，１１３，１１４それぞれの外径とレンズ保持部材１３０の内壁１３１との間、およびレンズ保持部材１３０の外壁１３２とレンズ枠１４０の内面１４１との間は、レンズの軸ズレなどによる光学性能の低下を起さないよう、例えば５μｍ以上２０μｍ以下のクリアランス、好ましくは１０μｍ以下のクリアランスとなるように公差管理されている。 In the lens barrel 100 thus configured, 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. In order to prevent the optical performance from being deteriorated due to lens axial displacement or the like, the tolerance is controlled so that the clearance is, for example, 5 μm or more and 20 μm or less, preferably 10 μm or less.
　第１実施形態のレンズ鏡胴１００は、レンズ枠１４０の内面１４１に囲まれた内部に支持された、内壁１３１に囲まれた内部に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を周回方向全周にわたって保持するレンズ保持部材１３０が、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠１４０双方の硬度よりも低い硬度を有する樹脂製部材である。従って、第１実施形態のレンズ鏡胴１００によれば、このレンズ鏡胴１００の組み立て時において、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３とレンズ枠１４０とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、削れカスに起因して光学性能が悪化することが防止される。尚、レンズ鏡胴１００の組立方法については後述する。 The lens barrel 100 according to the first embodiment 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.
　以上で、本発明のレンズ鏡胴の第１実施形態の説明を終了し、本発明のレンズ鏡胴の第２実施形態について説明する。 Above, description of 1st Embodiment of the lens barrel of this invention is complete | finished, and 2nd Embodiment of the lens barrel of this invention is described.
　尚、以下説明する第２実施形態は、レンズ保持部材およびレンズ枠が上述した第１実施形態とは異なる。 In the second embodiment described below, the lens holding member and the lens frame are different from the first embodiment described above.
　以下、第１実施形態における要素と同じ要素については同じ符号を付して説明を省略し、第１実施形態との相違点についてのみ説明する。 Hereinafter, the same elements as those in the first embodiment will be denoted by the same reference numerals, description thereof will be omitted, and only differences from the first embodiment will be described.
　図４は、本発明のレンズ鏡胴の第２実施形態であるレンズ鏡胴２００を被写体側斜め上から見て示した斜視図である。また、図５は、図４に示すレンズ鏡胴２００の光軸方向と平行な縦断面図であり、図６は、図４に示すレンズ鏡胴２００の光軸方向と直角な縦断面図である。 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, and FIG. 6 is a longitudinal sectional view perpendicular to the optical axis direction of the lens barrel 200 shown in FIG. is there.
　図４～図６に示すように、第２実施形態のレンズ鏡胴２００は、４つのレンズ１１１，１１２，１１３，１１４と、３つの間隔環１２１，１２２，１２３と、レンズ保持部材２３０と、レンズ枠２４０と、押さえ環１５０とを備えている。 As shown in FIGS. 4 to 6, 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.
　レンズ保持部材２３０は、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠２４０双方の硬度よりも低い硬度を有する樹脂製部材である。また、このレンズ保持部材２３０は、光軸方向である矢印Ａ方向両端に開口して内壁２３１と外壁２３２とを有する。また、このレンズ保持部材２３０は、円筒状の筒部２３３と、筒部２３３の３箇所から光軸方向である矢印Ａ方向に並んで延在した３本の延在部２３４とを有する。また、このレンズ保持部材２３０は、筒部２３３を被写体側に向け、延在部２３４を結像側に向けて配置されている。つまり、このレンズ保持部材２３０は、被写体側が一周にわたって連続し、結像側が筒部２３３の周回方向に断続した形状を有している。尚、このレンズ保持部材２３０は、第１実施形態における円筒状のレンズ保持部材１３０に対し切り欠きを有する形状ということもできる。このようなレンズ保持部材２３０において、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３のうちの、結像側寄りの第１レンズ１１１、第１間隔環１２１、第２レンズ１１２、第２間隔環１２２、および第３レンズ１１３は、延在部２３４における内壁２３１に囲まれた内部に保持されている。また、このようなレンズ保持部材２３０において、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３のうちの、被写体側寄りの第３間隔環１２３および第４レンズ１１４は、筒部２３３における内壁２３１に囲まれた内部に周回方向全周にわたって保持されている。また、レンズ保持部材２３０の矢印Ａ方向全長は、重ねて配置された４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３の厚みよりも短い。従って、図５に示すように、レンズ保持部材２３０の光軸方向である矢印Ａ方向前端２３５に隣接した位置に、レンズ保持部材２３０の矢印Ａ方向への伸縮を許容する隙間が形成されている。そのため、周囲の温度変化を受けてレンズ保持部材２３０が膨張したとしても、その隙間で吸収される。このようなレンズ保持部材２３０は、例えば２ｍｍ以下、好ましくは１ｍｍ以下の厚さを有する。このレンズ保持部材２３０が、本発明にいうレンズ保持部材の一例に相当するものである。 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. In addition, 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. That is, 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. In such a lens holding member 230, 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. Further, in such a lens holding member 230, among the four lenses 111, 112, 113, 114 and the three spacing rings 121, 122, 123, 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. 5, 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. Such 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.
　レンズ枠２４０は、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３双方の硬度よりも高い硬度を有するセラミック製部材である。また、このレンズ枠２４０は、光軸方向である矢印Ａ方向両端に開口した中空形状であって、内面２４１と、外面２４２とを有する。また、このレンズ枠２４０は、４つのレンズ１１１，１１２，１１３，１１４のうちの最結像側に配備される第１レンズ１１１の結像側の面の周縁部分１１１１を押さえる結像側レンズ押さえ部２４３を有する。さらに、このレンズ枠２４０は、レンズ枠２４０内面２４１に、光軸方向である矢印Ａ方向に延び周回方向に交互に形成された、レンズ保持部材２３０の延在部２３４を収容する３本の凹溝２４１１と、３本の凹溝２４１１同士の間に形成された３本の突条２４１２とを有する。このようなレンズ枠２４０は、内面２４１に囲まれた内部にレンズ保持部材２３０を支持している。このレンズ枠２４０が、本発明にいうレンズ枠の一例に相当するものである。 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. In addition, 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. Further, 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.
　このように構成されたレンズ鏡胴２００では、レンズ枠２４０内に収容された４つのレンズ１１１，１１２，１１３，１１４の、光軸方向である矢印Ａ方向の位置が、結像側レンズ押さえ部２４３、３つの間隔環１２１，１２２，１２３、および押さえ環１５０によって決められている。 In the lens barrel 200 configured in this way, 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.
　また、このように構成されたレンズ鏡胴２００において、４つのレンズ１１１，１１２，１１３，１１４それぞれの外径とレンズ保持部材２３０の内壁２３１との間、およびレンズ保持部材２３０の外壁２３２とレンズ枠２４０の内面２４１との間は、レンズの軸ズレなどによる光学性能の低下を起さないよう、例えば５μｍ以上２０μｍ以下のクリアランス、好ましくは１０μｍ以下のクリアランスとなるように公差管理されている。また、４つのレンズ１１１，１１２，１１３，１１４それぞれの外径とレンズ枠２４０内面２４１の突条２４１２との間は、レンズ挿入時に接触しないよう、４つのレンズ１１１，１１２，１１３，１１４それぞれの外径とレンズ保持部材２３０の内壁２３１との間のクリアランスよりも大きいクリアランスが設けられている。ただし、このクリアランスは、レンズの軸ズレなどによる光学性能の低下を起さない限度に、例えば３０μｍ以下、好ましくは１５μｍ以下に設定されている。 Further, in the lens barrel 200 configured as described above, 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. The tolerance 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 μm or more and 20 μm or less, preferably 10 μm or less, so as not to cause a decrease in optical performance due to an axial deviation of the lens. Further, 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. However, this clearance is set to, for example, 30 μm or less, and preferably 15 μm or less, to the extent that optical performance is not deteriorated due to lens axis misalignment or the like.
　第２実施形態のレンズ鏡胴２００は、レンズ枠２４０の内面２４１に囲まれた内部に支持された、内壁２３１に囲まれた内部に４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を保持するレンズ保持部材２３０が、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠２４０双方の硬度よりも低い硬度を有する樹脂製部材である。従って、第２実施形態のレンズ鏡胴２００によれば、このレンズ鏡胴２００の組み立て時において、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３とレンズ枠２４０とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、削れカスに起因して光学性能が悪化することが防止される。また、第２実施形態のレンズ鏡胴２００は、レンズ保持部材２３０が筒部２３３と３本の延在部２３４とを有し、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３のうちの結像側寄りの第１レンズ１１１、第１間隔環１２１、第２レンズ１１２、第２間隔環１２２、および第３レンズ１１３は延在部２３４における内壁２３１に囲まれた内部に保持されたものであるため、レンズ鏡胴２００の組み立て時において、レンズ保持部材２３０の内壁２３１に囲まれた内部に４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を保持させたり、レンズ枠２４０内にレンズ保持部材２３０を挿入したりするときの作業性に優れる。また、第２実施形態のレンズ鏡胴２００は、レンズ枠２４０が内面２４１に３本の凹溝２４１１と３本の突条２４１２とを有するものであるため、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３が確実に保持される。尚、レンズ鏡胴２００の組立方法については後述する。 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. For this reason, it is possible to prevent the optical performance from being deteriorated due to the scraped residue. In the lens barrel 200 of the second embodiment, 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. It is excellent in workability when holding 122, 123 or inserting the lens holding member 230 into the lens frame 240. In the lens barrel 200 of the second embodiment, since 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.
　以上で、本発明のレンズ鏡胴の第２実施形態の説明を終了し、本発明のレンズ鏡胴の第３実施形態について説明する。 Above, description of 2nd Embodiment of the lens barrel of this invention is complete | finished, and 3rd Embodiment of the lens barrel of this invention is described.
　尚、以下説明する第３実施形態は、レンズ保持部材が上述した第１実施形態とは異なる。 In the third embodiment described below, the lens holding member is different from the first embodiment described above.
　以下、第１実施形態における要素と同じ要素については同じ符号を付して説明を省略し、第１実施形態との相違点についてのみ説明する。 Hereinafter, the same elements as those in the first embodiment will be denoted by the same reference numerals, description thereof will be omitted, and only differences from the first embodiment will be described.
　図７は、本発明のレンズ鏡胴の第３実施形態であるレンズ鏡胴３００の光軸方向と平行な縦断面図である。 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.
　図７に示すように、第３実施形態のレンズ鏡胴３００は、４つのレンズ１１１，１１２，１１３，１１４と、３つの間隔環１２１，１２２，１２３と、レンズ保持部材３３０と、レンズ枠１４０と、押さえ環１５０とを備えている。 As shown in FIG. 7, 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.
　レンズ保持部材３３０は、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠１４０双方の硬度よりも低い硬度を有する樹脂製部材である。また、このレンズ保持部材３３０は、円筒状であり、光軸方向である矢印Ａ方向両端に開口して内壁１３１と外壁１３２とを有する。さらに、このレンズ保持部材３３０は、４つのレンズ１１１，１１２，１１３，１１４のうちの最被写体側に配備される第４レンズ１１４の被写体側の面の周縁部分１１４１を覆う被写体側レンズ覆い部３３３を有する。また、レンズ保持部材３３０の矢印Ａ方向全長は、重ねて配置された４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３の厚みよりも短い。従って、レンズ保持部材３３０の光軸方向である矢印Ａ方向後端３３４に隣接した位置に、レンズ保持部材３３０の矢印Ａ方向への伸縮を許容する隙間が形成されている。そのため、周囲の温度変化を受けてレンズ保持部材３３０が膨張したとしても、その隙間で吸収される。このようなレンズ保持部材３３０は、例えば２ｍｍ以下、好ましくは１ｍｍ以下の厚さを有する。このレンズ保持部材３３０が、本発明にいうレンズ保持部材の一例に相当するものである。 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. Further, 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. Have 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.
　押さえ環１５０は、例えばレンズ枠１４０と同じ材質であるセラミック製部材であり、概略筒状であり、一方の開口端は筒の中央に向かって張り出した形状を有している。また、この押さえ環１５０は、レンズ枠１４０に支持されている。より詳細には、押さえ環１５０はレンズ枠１４０の被写体側の端に被さり、レンズ枠１４０に固定されている。尚、押さえ環１５０のレンズ枠１４０への固定は、上述したように、接着固定であってもよく、あるいは、押さえ環１５０の内周およびレンズ枠１４０の外面１４２にねじ山を設けてなるねじ止め固定であってもよい。また、この押さえ環１５０は、レンズ枠１４０に支持されたレンズ保持部材１３０に保持された４つのレンズ１１１，１１２，１１３，１１４のうちの最被写体側に配備される第４レンズ１１４の被写体側の面の周縁部分１１４１を、レンズ保持部材３３０の被写体側レンズ覆い部３３３を介在させた状態で押さえている。この押さえ環１５０が、本発明にいう押さえ環の一例に相当するものである。 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.
　このように構成されたレンズ鏡胴３００では、レンズ枠１４０内に収容された４つのレンズ１１１，１１２，１１３，１１４の、光軸方向である矢印Ａ方向の位置が、結像側レンズ押さえ部１４３、３つの間隔環１２１，１２２，１２３、および押さえ環１５０によって決められている。 In the lens barrel 300 configured in this way, 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.
　また、このように構成されたレンズ鏡胴３００において、４つのレンズ１１１，１１２，１１３，１１４それぞれの外径とレンズ保持部材３３０の内壁１３１との間、およびレンズ保持部材３３０の外壁１３２とレンズ枠１４０の内面１４１との間は、レンズの軸ズレなどによる光学性能の低下を起さないよう、例えば５μｍ以上２０μｍ以下のクリアランス、好ましくは１０μｍ以下のクリアランスとなるように公差管理されている。 Further, in the lens barrel 300 thus configured, 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. The tolerance is controlled between the inner surface 141 of the frame 140 and a clearance of, for example, 5 μm or more and 20 μm or less, and preferably 10 μm or less so as not to cause a decrease in optical performance due to an axial deviation of the lens.
　第３実施形態のレンズ鏡胴３００は、上述した第１実施形態のレンズ鏡胴１００と同様に、レンズ枠１４０の内面１４１に囲まれた内部に支持された、内壁１３１に囲まれた内部に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を周回方向全周にわたって保持するレンズ保持部材３３０が、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠１４０双方の硬度よりも低い硬度を有する樹脂製部材である。従って、第３実施形態のレンズ鏡胴３００によっても、このレンズ鏡胴３００の組み立て時において、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３とレンズ枠１４０とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、削れカスに起因して光学性能が悪化することが防止される。また、第３実施形態のレンズ鏡胴３００は、レンズ保持部材３３０が第４レンズ１１４の被写体側の面の周縁部分１１４１を覆う被写体側レンズ覆い部３３３を有しており、押さえ環１５０が、被写体側レンズ覆い部３３３を介在させた状態でその周縁部分１１４１を押さえるものである。従って、第３実施形態のレンズ鏡胴３００によれば、特に、押さえ環１５０のレンズ枠１４０への固定がねじ止め固定である場合には、このレンズ鏡胴３００の組み立て時において、押さえ環１５０をレンズ枠１４０に取り付けるときに第４レンズ１１４が供回りして隣接する間隔環１２３と擦れて傷付くことが防止される。尚、レンズ鏡胴３００の組立方法については後述する。 Similarly to the lens barrel 100 of the first embodiment described above, 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. There is no rubbing, and it is avoided that both scrape and scrap and scrap is generated. For this reason, it is possible to prevent the optical performance from being deteriorated due to the scraped residue. In the lens barrel 300 of the third embodiment, 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.
　以上で、本発明のレンズ鏡胴の第３実施形態の説明を終了し、本発明のレンズ鏡胴組立方法の第１実施形態について説明する。 Above, description of 3rd Embodiment of the lens barrel of this invention is complete | finished, and 1st Embodiment of the lens barrel assembling method of this invention is described.
　以下説明する第１実施形態は、図１～図３を参照して説明したレンズ鏡胴１００の組立方法である。尚、この組立方法は、図４～図６を参照して説明したレンズ鏡胴２００の組立方法としても適用できるが、ここでは、レンズ鏡胴１００の組立方法について説明する。 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.
　以下、そのレンズ鏡胴１００の構成要素それぞれについては同じ符号を付して説明を省略し、レンズ鏡胴１００（図１～図３参照）の組立方法についてのみ説明する。 Hereinafter, 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.
　まず、レンズ枠１４０内にレンズ保持部材１３０を挿入する。 First, the lens holding member 130 is inserted into the lens frame 140.
　次に、レンズ枠１４０内に挿入された状態のレンズ保持部材１３０の内壁１３１に囲まれた内部に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を周回方向全周にわたって保持させる。 Next, 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.
　最後に、押さえ環１５０をレンズ枠１４０に取り付け、４つのレンズ１１１，１１２，１１３，１１４のうちの最被写体側に配備される第４レンズ１１４の被写体側の面の周縁部分１１４１を押さえる。これによって、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３が、レンズ枠１４０の結像側レンズ押さえ部１４３と押さえ環１５０との間に挟み付けられ、レンズ枠１４０内で固定される。 Finally, 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. As a result, 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.
　上述したように、レンズ保持部材１３０は、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠１４０双方の硬度よりも低い硬度を有する樹脂製部材であるため、第１実施形態のレンズ鏡胴組立方法によれば、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３とレンズ枠１４０とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、組み立てられたレンズ鏡胴１００において、削れカスに起因して光学性能が悪化することが防止される。 As described above, 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. According to the method, 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.
　以上で、本発明のレンズ鏡胴組立方法の第１実施形態の説明を終了し、本発明のレンズ鏡胴組立方法の第２実施形態について説明する。 Above, description of 1st Embodiment of the lens barrel assembling method of this invention is complete | finished, and 2nd Embodiment of the lens barrel assembling method of this invention is described.
　以下説明する第２実施形態は、図４～図６を参照して説明したレンズ鏡胴２００の組立方法である。尚、この組立方法は、図１～図３を参照して説明したレンズ鏡胴１００の組立方法としても適用できるが、ここでは、レンズ鏡胴２００の組立方法について説明する。 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.
　以下、そのレンズ鏡胴２００の構成要素それぞれについては同じ符号を付して説明を省略し、レンズ鏡胴２００（図４～図６参照）の組立方法についてのみ説明する。 Hereinafter, 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.
　まず、レンズ保持部材２３０の延在部２３４における内壁２３１に囲まれた内部に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３のうちの、結像側寄りの第１レンズ１１１、第１間隔環１２１、第２レンズ１１２、第２間隔環１２２、および第３レンズ１１３を保持させる。また、レンズ保持部材２３０の筒部２３３における内壁２３１に囲まれた内部に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３のうちの、被写体側寄りの第３間隔環１２３および第４レンズ１１４を周回方向全周にわたって保持させる。 First, inside the extended portion 234 of the lens holding member 230 surrounded by the inner wall 231, 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. In addition, 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.
　次に、レンズ枠２４０内に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を保持させた状態のレンズ保持部材２３０を挿入する。 Next, 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.
　最後に、押さえ環１５０をレンズ枠２４０に取り付け、４つのレンズ１１１，１１２，１１３，１１４のうちの最被写体側に配備される第４レンズ１１４の被写体側の面の周縁部分１１４１を押さえる。これによって、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３が、レンズ枠２４０の結像側レンズ押さえ部２４３と押さえ環１５０との間に挟み付けられ、レンズ枠２４０内で固定される。 Finally, 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. As a result, 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.
　上述したように、レンズ保持部材２３０は、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠２４０双方の硬度よりも低い硬度を有する樹脂製部材であるため、第２実施形態のレンズ鏡胴組立方法によれば、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３とレンズ枠２４０とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、組み立てられたレンズ鏡胴２００において、削れカスに起因して光学性能が悪化することが防止される。 As described above, since 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.
　また、第２実施形態のレンズ鏡胴組立方法は、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を保持させた状態のレンズ保持部材２３０をレンズ枠２４０内に挿入する組立方法であるため、組立性に優れるとともに、傾いた姿勢でレンズが挿入されることによる擦れが回避される。さらに、第２実施形態のレンズ鏡胴組立方法によれば、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３をレンズ保持部材２３０に保持させた状態で光学性能を確認することもできる。この場合、レンズ保持部材２３０をレンズ枠２４０内に挿入した状態でレンズの位置を調整する煩雑さが回避される。 In the lens barrel assembling method of the second embodiment, 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.
　また、第２実施形態のレンズ鏡胴組立方法は、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３のうちの結像側寄りの第１レンズ１１１、第１間隔環１２１、第２レンズ１１２、第２間隔環１２２、および第３レンズ１１３は延在部２３４における内壁２３１に囲まれた内部に保持させるため、レンズ保持部材２３０の内壁２３１に囲まれた内部に４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を保持させたり、レンズ枠２４０内にレンズ保持部材２３０を挿入したりするときの作業性に優れる。 In addition, 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.
　以上で、本発明のレンズ鏡胴組立方法の第２実施形態の説明を終了し、本発明のレンズ鏡胴組立方法の第３実施形態について説明する。 Above, description of 2nd Embodiment of the lens barrel assembling method of this invention is complete | finished, and 3rd Embodiment of the lens barrel assembling method of this invention is described.
　以下説明する第３実施形態は、図７を参照して説明したレンズ鏡胴３００の組立方法である。 The third embodiment described below is an assembling method of the lens barrel 300 described with reference to FIG.
　以下、そのレンズ鏡胴３００の構成要素それぞれについては同じ符号を付して説明を省略し、レンズ鏡胴３００（図７参照）の組立方法についてのみ説明する。 Hereinafter, 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.
　まず、レンズ保持部材３３０の内壁１３１に囲まれた内部に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を周回方向全周にわたって保持させる。 First, 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.
　次に、レンズ枠１４０内に、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を保持させた状態のレンズ保持部材３３０を挿入する。 Next, 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.
　最後に、押さえ環１５０をレンズ枠１４０に取り付け、４つのレンズ１１１，１１２，１１３，１１４のうちの最被写体側に配備される第４レンズ１１４の被写体側の面の周縁部分１１４１を、レンズ保持部材３３０の被写体側レンズ覆い部３３３を介在させた状態で押さえる。 Finally, 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.
　上述したように、レンズ保持部材３３０は、４つのレンズ１１１，１１２，１１３，１１４およびレンズ枠１４０双方の硬度よりも低い硬度を有する樹脂製部材であるため、第３実施形態のレンズ鏡胴組立方法によれば、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３とレンズ枠１４０とが擦れることがなく、両者が擦れて削れカスが発生することが回避される。このため、組み立てられたレンズ鏡胴３００において、削れカスに起因して光学性能が悪化することが防止される。また、上述したように、押さえ環１５０のレンズ枠１４０への固定は、接着固定であってもよく、あるいは、押さえ環１５０の内周およびレンズ枠１４０の外面１４２にねじ山を設けてなるねじ止め固定であってもよいが、特に、押さえ環１５０のレンズ枠１４０への固定がねじ止め固定である場合に、押さえ環１５０をレンズ枠１４０に取り付けるときに第４レンズ１１４が供回りして隣接する間隔環１２３と擦れて傷付くことが防止される。より詳細には、レンズ保持部材３３０の外壁１３２とレンズ枠１４０の内面１４１との接触面積の方が、レンズ保持部材３３０の被写体側レンズ覆い部３３３と押さえ環１５０との接触面積より大きいため、押さえ環１５０の内面がレンズ保持部材３３０の被写体側レンズ覆い部３３３前面と接する際に、レンズ保持部材３３０が押さえ環１５０と供回りすることがない。従って、その際に、第４レンズ１１４が押さえ環１５０と供回りすることがない。 As described above, since 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. According to the method, 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 300, it is possible to prevent the optical performance from being deteriorated due to the scraped residue. Further, as described above, 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. Although 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.
　さらに、第３実施形態のレンズ鏡胴組立方法は、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３を保持させた状態のレンズ保持部材３３０をレンズ枠１４０内に挿入する組立方法であるため、組立性に優れるとともに、傾いた姿勢でレンズが挿入されることによる擦れが回避される。また、第３実施形態のレンズ鏡胴組立方法によれば、４つのレンズ１１１，１１２，１１３，１１４および３つの間隔環１２１，１２２，１２３をレンズ保持部材３３０に保持させた状態で光学性能を確認することもできる。この場合、レンズ保持部材３３０をレンズ枠１４０内に挿入した状態でレンズの位置を調整する煩雑さが回避される。 Further, in the lens barrel assembling method of the third embodiment, 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.
　以上で、本発明のレンズ鏡胴組立方法の第３実施形態の説明を終了する。 This is the end of the description of the third embodiment of the lens barrel assembling method of the present invention.
　尚、上述した実施形態では、本発明にいう複数のレンズが、４つのレンズである例を挙げて説明したが、本発明にいう複数のレンズは、これに限られるものではない。 In the above-described embodiment, the example in which the plurality of lenses according to the present invention is four lenses has been described. However, the plurality of lenses according to the present invention is not limited to this.
　また、上述した実施形態では、本発明にいうレンズ保持部材が、樹脂製部材である例を挙げて説明したが、本発明にいうレンズ保持部材は、これに限られるものではなく、レンズおよびレンズ枠双方の硬度よりも低い硬度を有する部材であればよく、例えば、銅、アルミニウムや真鍮などといった金属製部材であってもよい。 In the above-described embodiment, the lens holding member referred to in the present invention is described as an example of a resin member. However, 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. For example, a metal member such as copper, aluminum, or brass may be used.
　また、上述した実施形態では、本発明にいう延在部が、３本である例を挙げて説明したが、本発明にいう延在部は、これに限られるものではなく、少なくとも３本であればよい。 Further, in the above-described embodiment, the example in which the 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.
　また、上述した実施形態では、本発明における光軸方向前端側および後端側を、それぞれ被写体側および結像側とした例で説明したが、本発明はこれに限られるものでなく、結像側が本発明における前端側であり被写体側が本発明における後端側であってもよい。 In the above-described embodiment, the example in which the front end side and the rear end side in the optical axis direction in the present invention are the subject side and the image forming side, respectively, has been described, but 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.
　１００，２００，３００　　レンズ鏡胴
　１１１　　第１レンズ
　１１１１　　周縁部分
　１１２　　第２レンズ
　１１３　　第３レンズ
　１１４　　第４レンズ
　１１４１　　周縁部分
　１２１　　第１間隔環
　１２２　　第２間隔環
　１２３　　第３間隔環
　１３０，２３０，３３０　　レンズ保持部材
　１３１，２３１　　内壁
　１３２，２３２　　外壁
　１３３，２３５　　前端
　２３３　　筒部
　２３４　　延在部
　３３３　　被写体側レンズ覆い部
　３３４　　後端
　１４０，２４０　　レンズ枠
　１４１，２４１　　内面
　２４１１　　凹溝
　２４１２　　突条
　１４２，２４２　　外面
　１４３，２４３　　結像側レンズ押さえ部
　１５０　　押さえ環 100, 200, 300 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

Claims (12)

  1. 　複数のレンズと、
    　光軸方向前端部と後端部との双方に開口して内壁と外壁とを有し、該内壁に囲まれた内部に前記複数のレンズを保持するレンズ保持部材と、
    　光軸方向前端部と後端部との双方に開口した中空形状であって、内面と、外面と、前記複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有し、該内面に囲まれた内部に前記レンズ保持部材を支持するレンズ枠と、
    　前記レンズ枠に支持され、該レンズ枠に支持された前記レンズ保持部材に保持された前記複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を押さえる押さえ環とを備え、
    　前記レンズ保持部材が、前記複数のレンズおよび前記レンズ枠双方の硬度よりも低い硬度を有するものであることを特徴とするレンズ鏡胴。     Multiple lenses,
    A lens holding member that has openings on both the front end portion and the rear end portion in the optical axis direction, has an inner wall and an outer wall, and holds the plurality of lenses inside the inner wall; and
    A hollow shape opened at both the front end portion and the rear end portion in the optical axis direction, the inner surface, the outer surface, and the rear end side of the rear end side lens disposed on the rearmost end side of the plurality of lenses. A lens frame for supporting the lens holding member inside the inner surface surrounded by the inner surface;
    A presser that is supported by the lens frame and that presses 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 held by the lens holding member supported by the lens frame. With a ring,
    The lens barrel, wherein the lens holding member has a hardness lower than the hardness of both the plurality of lenses and the lens frame.
  2. 　複数のレンズと、
    　光軸方向前端部と後端部との双方に開口し、内壁と、外壁と、前記複数のレンズのうちの最前端側に配備される前端側レンズの前端側レンズの前端側の面の周縁部分を覆う前端側レンズ覆い部とを有し、該内壁に囲まれた内部に前記複数のレンズを保持するレンズ保持部材と、
    　光軸方向両端に開口した中空形状であって、内面と、外面と、前記複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有し、該内面に囲まれた内部に前記レンズ保持部材を支持するレンズ枠と、
    　前記レンズ枠に支持され、該レンズ枠に支持された前記レンズ保持部材に保持された前記複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を、前記レンズ保持部材の前端側レンズ覆い部を介在させた状態で押さえる押さえ環とを備え、
    　前記レンズ保持部材が、前記複数のレンズおよび前記レンズ枠双方の硬度よりも低い硬度を有するものであることを特徴とするレンズ鏡胴。     Multiple lenses,
    The peripheral edge of the front end side surface of the front end lens of the front end side lens that opens to both the front end portion and the rear end portion in the optical axis direction and is disposed on the front end side of the inner wall, the outer wall, and the plurality of lenses. A lens holding member that holds the plurality of lenses in an interior surrounded by the inner wall, and a front end side lens covering portion that covers the portion;
    A hollow shape that is open at both ends in the direction of the optical axis, the inner surface, the outer surface, and the rear end that presses the peripheral edge portion of the rear end side surface of the rear end side lens disposed on the rearmost end side of the plurality of lenses A lens frame having a side lens pressing portion, and supporting the lens holding member inside the inner surface,
    The peripheral portion of the front end side surface of the front end side lens disposed on the most front end side among the plurality of lenses supported by the lens frame and held by the lens holding member supported by the lens frame, A holding ring for pressing in a state where the front lens cover of the lens holding member is interposed,
    The lens barrel, wherein the lens holding member has a hardness lower than the hardness of both the plurality of lenses and the lens frame.
  3. 　前記レンズ枠が、セラミック製であることを特徴とする請求項１または２記載のレンズ鏡胴。 3. The lens barrel according to claim 1, wherein the lens frame is made of ceramic.
  4. 　前記レンズ保持部材の光軸方向前端又は後端に隣接した位置に、該レンズ保持部材の光軸方向への伸縮を許容する隙間が形成されていることを特徴とする請求項１から３のうちのいずれか１記載のレンズ鏡胴。 The clearance gap which accepts the expansion-contraction to the optical axis direction of this lens holding member is formed in the position adjacent to the optical axis direction front end or rear end of the said lens holding member among Claim 1 to 3 characterized by the above-mentioned. The lens barrel according to any one of the above.
  5. 　前記レンズ保持部材が、樹脂製部材であることを特徴とする請求項１から４のうちのいずれか１項記載のレンズ鏡胴。 The lens barrel according to any one of claims 1 to 4, wherein the lens holding member is a resin member.
  6. 　前記複数のレンズにおける隣接するレンズ間に配置されて該複数のレンズとともに前記レンズ保持部材に保持された間隔環をさらに備えたことを特徴とする請求項１から５のうちのいずれか１項記載のレンズ鏡胴。 6. The apparatus according to claim 1, further comprising a spacing ring disposed between adjacent lenses in the plurality of lenses and held by the lens holding member together with the plurality of lenses. Lens barrel.
  7. 　前記レンズ保持部材が、前記複数のレンズを周回方向全周にわたって保持するものであることを特徴とする請求項１から６のうちのいずれか１項記載のレンズ鏡胴。 The lens barrel according to any one of claims 1 to 6, wherein the lens holding member holds the plurality of lenses over the entire circumference of the rotating direction.
  8. 　前記レンズ保持部材が、前端側に一周にわたって連続する筒部と、後端側が周回方向に断続し光軸方向に延在した少なくとも３本の延在部とを有し、前記複数のレンズのうちの少なくとも一部のレンズは前記延在部に保持されたものであることを特徴とする請求項１から７のうちのいずれか１項記載のレンズ鏡胴。 The lens holding member has a cylindrical portion continuous over the entire circumference on the front end side, and at least three extending portions extending in the optical axis direction on the rear end side intermittently in the rotation direction, and among the plurality of lenses The lens barrel according to claim 1, wherein at least a part of the lens is held by the extending portion.
  9. 　前記レンズ枠が、該レンズ枠内面に、光軸方向に延び周回方向に交互に形成された、前記レンズ保持部材の前記延在部を収容する凹溝と、該凹溝同士の間に形成された突条とを有するものであることを特徴とする請求項８項記載のレンズ鏡胴。 The lens frame is formed between the concave grooves, which are formed on the inner surface of the lens frame so as to extend in the optical axis direction and are alternately formed in the circumferential direction and accommodate the extending portions of the lens holding member. The lens barrel according to claim 8, further comprising a protruding protrusion.
  10. 　光軸方向前端部と後端部との双方に開口して内壁と外壁とを有するレンズ保持部材の該内壁に囲まれた内部に複数のレンズを保持させ、
    　光軸方向前端部と後端部との双方に開口した中空形状であって、内面と、外面と、前記複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有するレンズ枠内に、該複数のレンズを保持させた状態のレンズ保持部材を挿入し、
    　前記レンズ枠内に挿入された前記レンズ保持部材に保持された前記複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を押さえる押さえ環を前記レンズ枠に取り付けることを特徴とするレンズ鏡胴組立方法。     A plurality of lenses are held inside the lens holding member that is open at both the front end and the rear end in the optical axis direction and has an inner wall and an outer wall, and is surrounded by the inner wall.
    A hollow shape opened at both the front end portion and the rear end portion in the optical axis direction, the inner surface, the outer surface, and the rear end side of the rear end side lens disposed on the rearmost end side of the plurality of lenses. A lens holding member in a state of holding the plurality of lenses is inserted into a lens frame having a rear end side lens pressing portion that presses the peripheral portion of the surface;
    The lens frame has a pressing ring for pressing a peripheral edge portion of a front end side surface of a front end side lens provided on the front end side among the plurality of lenses held by the lens holding member inserted into the lens frame. A lens barrel assembling method characterized by being attached.
  11. 　光軸方向前端部と後端部との双方に開口した中空形状であって、内面と、外面と、複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有するレンズ枠内に、光軸方向前端部と後端部との双方に開口して内壁と外壁とを有するレンズ保持部材を挿入し、
    　前記レンズ枠内に挿入された状態の前記レンズ保持部材の前記内壁に囲まれた内部に前記複数のレンズを保持させ、
    　前記レンズ枠内に挿入された前記レンズ保持部材に保持された前記複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を押さえる押さえ環を前記レンズ枠に取り付けることを特徴とするレンズ鏡胴組立方法。     A hollow shape that opens to both the front end portion and the rear end portion in the optical axis direction, the inner surface, the outer surface, and the rear end surface of the rear end 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 in the optical axis direction is inserted into a lens frame having a rear end side lens pressing portion that presses the peripheral edge portion of
    Holding the plurality of lenses in an interior surrounded by the inner wall of the lens holding member inserted in the lens frame;
    The lens frame has a pressing ring for pressing a peripheral edge portion of a front end side surface of a front end side lens provided on the front end side among the plurality of lenses held by the lens holding member inserted into the lens frame. A lens barrel assembling method characterized by being attached.
  12. 　光軸方向前端部と後端部との双方に開口し、内壁と、外壁と、複数のレンズのうちの最前端側に配備される前端側レンズの前端側の面の周縁部分を覆う前端側レンズ覆い部とを有するレンズ保持部材の該内壁に囲まれた内部に前記複数のレンズを保持させ、
    　光軸方向両端に開口した中空形状であって、内面と、外面と、前記複数のレンズのうちの最後端側に配備される後端側レンズの後端側の面の周縁部分を押さえる後端側レンズ押さえ部とを有するレンズ枠内に、該複数のレンズを保持させた状態のレンズ保持部材を挿入し、
    　前記レンズ枠内に挿入された前記レンズ保持部材に保持された前記複数のレンズのうちの最前端側に配備された前端側レンズの前端側の面の周縁部分を、前記レンズ保持部材の前端側レンズ覆い部を介在させた状態で押さえる押さえ環を前記レンズ枠に取り付けることを特徴とするレンズ鏡胴組立方法。     Front end side that opens to both the front end portion and the rear end portion in the optical axis direction and covers the inner wall, the outer wall, and the peripheral portion of the front end side surface of the front end side lens disposed on the foremost end side of the plurality of lenses Holding the plurality of lenses in an interior surrounded by the inner wall of a lens holding member having a lens cover,
    A hollow shape that is open at both ends in the direction of the optical axis, the inner surface, the outer surface, and the rear end that presses the peripheral edge portion of the 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 in a state where the plurality of lenses are held in a lens frame having a side lens pressing portion;
    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 held by the lens holding member inserted into the lens frame is a front end side of the lens holding member. A method of assembling a lens barrel, comprising: attaching a holding ring for holding the lens covering portion to the lens frame.
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