JP2017053943A - Lens unit - Google Patents

Lens unit Download PDF

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JP2017053943A
JP2017053943A JP2015176738A JP2015176738A JP2017053943A JP 2017053943 A JP2017053943 A JP 2017053943A JP 2015176738 A JP2015176738 A JP 2015176738A JP 2015176738 A JP2015176738 A JP 2015176738A JP 2017053943 A JP2017053943 A JP 2017053943A
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lens
inclined surface
fixing
fixing means
optical axis
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JP6633324B2 (en
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昭洋 末永
Akihiro Suenaga
昭洋 末永
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Kyocera Corp
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Kyocera Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a lens unit that is hardly damaged.SOLUTION: A lens unit 10 includes: a lens body 21 having a cylindrical surface on an object side in an optical axis direction; a lens 20 that protrudes outwardly in a radial direction of the lens body 21, has a radius reduced from an image side toward the object side along an optical axis of the lens body, and includes a fixed part 22 whose surface on the object side has an inclined surface; and fixing means 40 for fixing by pressing force in the optical axis direction in the fixed part 22. The fixing means 40 is brought into contact with only the inclined surface of the fixed part 22.SELECTED DRAWING: Figure 1

Description

本発明は、レンズユニットに関するものである。   The present invention relates to a lens unit.

従来、レンズを固定手段(リテーナ)により固定する構造が知られている。例えば特許文献1には、外周にねじ部が形成された鏡筒に保持されたレンズを、鏡筒のねじ部に螺合する環状の押え部材(リテーナ)で押圧する構造が開示されている。   Conventionally, a structure in which a lens is fixed by a fixing means (retainer) is known. For example, Patent Document 1 discloses a structure in which a lens held in a lens barrel having a thread portion formed on the outer periphery is pressed by an annular pressing member (retainer) that is screwed into the screw portion of the lens barrel.

特開2011−048123公報JP 2011-048123 A

例えば特許文献1に記載された構造のレンズユニットを車両等の移動体に搭載すると、異物がレンズユニットに衝突した場合に、レンズユニットに強い衝撃が加わり、レンズに亀裂が入る可能性がある。   For example, when the lens unit having a structure described in Patent Document 1 is mounted on a moving body such as a vehicle, when a foreign object collides with the lens unit, a strong impact may be applied to the lens unit, and the lens may be cracked.

上記課題を解決するために、本発明の一態様に係るレンズユニットは、物体側に光軸方向に沿った円柱面を有するレンズ本体と、該レンズ本体の径方向外側に突出し、前記レンズ本体の光軸に沿って像側から前記物体側に向かうに連れて縮径するとともに、前記物体側の表面が傾斜面を有する固定部とを備えたレンズと、前記固定部において光軸方向に押圧して固定する固定手段とを有するとともに、前記固定手段が前記固定部のうち前記傾斜面にのみ接触していることを特徴とする。   In order to solve the above problems, a lens unit according to an aspect of the present invention includes a lens body having a cylindrical surface along the optical axis direction on the object side, and projecting radially outward of the lens body. A lens having a diameter that decreases from the image side to the object side along the optical axis, and a fixed portion having a sloped surface on the object side surface, and is pressed in the optical axis direction at the fixed portion. And the fixing means is in contact with only the inclined surface of the fixing portion.

本発明の一態様に係るレンズユニットによれば、レンズに亀裂が入る可能性を低減できる。   With the lens unit according to one aspect of the present invention, the possibility of cracks in the lens can be reduced.

本発明の実施形態に係るレンズユニットの構成を示す断面図である。It is sectional drawing which shows the structure of the lens unit which concerns on embodiment of this invention. 図1のレンズの傾斜面と固定手段との接触位置をレンズの上面図である。FIG. 2 is a top view of the lens at a contact position between an inclined surface of the lens of FIG. 1 and a fixing unit. 図1の固定部およびその周辺の拡大図である。FIG. 2 is an enlarged view of a fixed portion in FIG. 1 and its surroundings. 変形例のレンズユニットの拡大図である。It is an enlarged view of the lens unit of a modification.

図1は、本発明の実施形態に係るレンズユニットの概略構成を示す断面図である。レンズユニット10は、レンズ20と、レンズ保持体30と、固定手段40とを備える。レンズ保持体30と固定手段40とは、ねじによって螺合する。レンズユニット10は、レンズユニット10の外部の物体の被写体像を結像面に結像する。   FIG. 1 is a cross-sectional view illustrating a schematic configuration of a lens unit according to an embodiment of the present invention. The lens unit 10 includes a lens 20, a lens holder 30, and a fixing unit 40. The lens holder 30 and the fixing means 40 are screwed together with screws. The lens unit 10 forms a subject image of an object outside the lens unit 10 on an imaging surface.

レンズ20は、レンズ保持体30により保持される。レンズ20は、レンズ本体21と、レンズ本体21から径方向外側に鍔状に突出するように構成された固定部22とを有する。固定部22は、レンズ本体21の光軸に沿って像側から物体側に向かうに連れて縮径する。レンズ20は、固定部22において、固定手段40により、光軸方向に押圧されて固定される。固定手段40は、例えばリテーナであり、固定部22に接触する接触部41を有する。固定手段40に押圧されたレンズ20はレンズ保持体30に保持される。   The lens 20 is held by a lens holder 30. The lens 20 includes a lens main body 21 and a fixing portion 22 configured to project from the lens main body 21 radially outward in a bowl shape. The fixed portion 22 decreases in diameter along the optical axis of the lens body 21 from the image side toward the object side. The lens 20 is pressed and fixed in the optical axis direction by the fixing means 40 in the fixing portion 22. The fixing means 40 is a retainer, for example, and has a contact portion 41 that contacts the fixing portion 22. The lens 20 pressed by the fixing means 40 is held by the lens holder 30.

レンズ本体21は、レンズ本体21の外周側であってレンズ20の物体側において、レンズ面25に連結する、光軸方向に沿った円柱面23を有する。   The lens body 21 has a cylindrical surface 23 along the optical axis direction that is connected to the lens surface 25 on the outer peripheral side of the lens body 21 and on the object side of the lens 20.

固定部22は、傾斜面24を有する。傾斜面24は、固定部22がレンズ本体21の光軸に沿って像側から物体側に向かうに連れて縮径することによって、固定部22の物体側に形成される面である。傾斜面24は、円柱面23においてレンズ本体21に連結する。本実施形態において、傾斜面24は、図1に示すように、断面視において直線状となる。傾斜面24は、固定部22の外周側から円柱面23に向かって、光軸方向に垂直な面(図1における水平面)に対して所定の仰角θをなす。   The fixing portion 22 has an inclined surface 24. The inclined surface 24 is a surface formed on the object side of the fixed portion 22 by reducing the diameter of the fixed portion 22 along the optical axis of the lens body 21 from the image side toward the object side. The inclined surface 24 is connected to the lens body 21 at the cylindrical surface 23. In the present embodiment, the inclined surface 24 is linear in a cross-sectional view as shown in FIG. The inclined surface 24 forms a predetermined elevation angle θ with respect to a surface (horizontal plane in FIG. 1) perpendicular to the optical axis direction from the outer peripheral side of the fixed portion 22 toward the cylindrical surface 23.

本実施形態において、固定手段40の接触部41は、傾斜面24全体と接触するように傾斜面状に形成される。図2は、図1のレンズ20の傾斜面24と固定手段40との接触位置をレンズ20の平面視において示す図である。図2に示すように、レンズ20は平面視において、中央にレンズ面25を有し、レンズ面25の周辺に傾斜面24を有する。本実施形態のレンズ20は、図2に斜線で示す傾斜面24の領域全体に亘って固定手段40と接触する。すなわち、本実施形態において、レンズ20は、図2の斜線で示した領域において、固定手段40により押圧して固定される。   In the present embodiment, the contact portion 41 of the fixing means 40 is formed in an inclined surface shape so as to contact the entire inclined surface 24. FIG. 2 is a diagram showing a contact position between the inclined surface 24 of the lens 20 of FIG. 1 and the fixing means 40 in a plan view of the lens 20. As shown in FIG. 2, the lens 20 has a lens surface 25 at the center and an inclined surface 24 around the lens surface 25 in plan view. The lens 20 of the present embodiment is in contact with the fixing means 40 over the entire area of the inclined surface 24 shown by the oblique lines in FIG. That is, in the present embodiment, the lens 20 is pressed and fixed by the fixing means 40 in the region indicated by the oblique lines in FIG.

再び図1を参照すると、固定部22は傾斜面24を有することにより、レンズ20の中心に近いほど厚みが増す。そのため、本実施形態に係るレンズ20は、傾斜面24を有さないレンズ20と比較して光軸方向にかかる衝撃力に対して強くなり、固定手段40と、レンズ面25との境目の周辺に異物による衝撃が与えられた場合であっても、破壊されにくくなる。   Referring again to FIG. 1, the fixed portion 22 has the inclined surface 24, so that the thickness increases as the center of the lens 20 is closer. Therefore, the lens 20 according to the present embodiment is stronger against the impact force applied in the optical axis direction than the lens 20 having no inclined surface 24, and the periphery of the boundary between the fixing means 40 and the lens surface 25. Even when an impact due to a foreign object is applied to the surface, it is difficult to be destroyed.

また、固定部22は、傾斜面24を有することにより、レンズ20にかかる衝撃を分散できる。図3は、固定部22及びその周辺の拡大図である。本実施形態において、例えば図3に示すように、固定手段40と、レンズ面25との境目の周辺に異物による衝撃が発生する。ここで、固定部22は、傾斜面24を有するため、固定部22の衝撃力は、図3に示すように、傾斜面24に沿った方向及び傾斜面24に垂直な方向に分解して表現できる。このように、固定部22は傾斜面24を有することにより、光軸方向の衝撃力を分散することができる。そのため、本実施形態に係るレンズ20は、傾斜面24を有さないレンズ20と比較して破壊されにくくなる。   Further, since the fixing portion 22 has the inclined surface 24, the impact applied to the lens 20 can be dispersed. FIG. 3 is an enlarged view of the fixing portion 22 and its periphery. In the present embodiment, for example, as shown in FIG. 3, an impact caused by a foreign matter occurs around the boundary between the fixing means 40 and the lens surface 25. Here, since the fixing portion 22 has the inclined surface 24, the impact force of the fixing portion 22 is expressed by being decomposed into a direction along the inclined surface 24 and a direction perpendicular to the inclined surface 24 as shown in FIG. it can. Thus, the fixing portion 22 has the inclined surface 24, so that the impact force in the optical axis direction can be dispersed. Therefore, the lens 20 according to the present embodiment is less likely to be destroyed than the lens 20 that does not have the inclined surface 24.

傾斜面24の仰角θは、レンズユニット10の設計に合わせて適宜設定される。仰角θは、上述のように、固定部22にかかる衝撃力に対して破壊されてにくく、また衝撃を分散できる角度であることが好ましく、例えば10°以上70°未満の角度である。仰角θを10°以上とすることにより、光軸方向の衝撃力が分散されるとともに、固定部22の厚みが増すため、レンズ20が破壊されにくくなる。また、仰角θを70°未満とすることにより、固定手段40によりレンズ20をレンズ保持体30に固定できる。仰角θが70°以上となると、固定手段40がレンズ20を固定する力が弱まり、レンズ20が適切に固定されない可能性がある。   The elevation angle θ of the inclined surface 24 is appropriately set according to the design of the lens unit 10. As described above, the elevation angle θ is preferably an angle that is difficult to be destroyed by the impact force applied to the fixing portion 22 and that can disperse the impact. By setting the elevation angle θ to 10 ° or more, the impact force in the optical axis direction is dispersed and the thickness of the fixing portion 22 is increased, so that the lens 20 is not easily broken. Further, by setting the elevation angle θ to less than 70 °, the lens 20 can be fixed to the lens holder 30 by the fixing means 40. When the elevation angle θ is 70 ° or more, the force with which the fixing means 40 fixes the lens 20 is weakened, and the lens 20 may not be properly fixed.

さらに、固定手段40が固定部22のうち傾斜面24にのみ接触している。そのため、固定部22のうち固定手段40に接触する全ての領域が傾斜面24になるので、衝撃を良好に分散できるようになる。本実施形態においては、固定部22のうち物体側の面の全てが傾斜面24になっている。   Further, the fixing means 40 is in contact with only the inclined surface 24 of the fixing portion 22. For this reason, the entire area of the fixing portion 22 that contacts the fixing means 40 is the inclined surface 24, so that the impact can be dispersed well. In the present embodiment, all of the object-side surfaces of the fixed portion 22 are inclined surfaces 24.

また、図4に示すように、傾斜面24を第1傾斜面24としたときに、固定手段40が
第1傾斜面24に接する第2傾斜面42を有するとともに、径方向に対する第2傾斜面42の傾斜角が、径方向に対する第1傾斜面24の傾斜角よりも大きくてもよい。これにより、固定手段40によって固定部22を抑えつつも、レンズ面25の近傍において固定手段40と固定部22との間に微細な隙間ができる。これにより、固定手段40のうちレンズ面25の近傍に異物が衝突した場合の衝撃をこの隙間で吸収できる。そのため、固定手段40によって固定部22を抑えつつ、レンズ面25に亀裂が入るおそれを低減できる。第2傾斜面42の傾斜角は、第1傾斜面24の傾斜角よりも0.5〜5°程度に大きく設定できる。0.5°以上にすることによって衝撃を吸収する隙間を形成できるとともに、5°以下にすることによって固定手段40によって固定部20を良好に抑えることができる。
As shown in FIG. 4, when the inclined surface 24 is the first inclined surface 24, the fixing means 40 has a second inclined surface 42 in contact with the first inclined surface 24, and the second inclined surface with respect to the radial direction. The inclination angle of 42 may be larger than the inclination angle of the first inclined surface 24 with respect to the radial direction. Accordingly, a fine gap is formed between the fixing unit 40 and the fixing unit 22 in the vicinity of the lens surface 25 while the fixing unit 40 is suppressed by the fixing unit 40. Thereby, the impact when a foreign object collides with the vicinity of the lens surface 25 in the fixing means 40 can be absorbed by this gap. Therefore, it is possible to reduce the risk of cracks in the lens surface 25 while suppressing the fixing portion 22 by the fixing means 40. The inclination angle of the second inclined surface 42 can be set larger than the inclination angle of the first inclined surface 24 by about 0.5 to 5 °. By setting the angle to 0.5 ° or more, a gap for absorbing an impact can be formed, and by setting the angle to 5 ° or less, the fixing unit 20 can be satisfactorily suppressed by the fixing means 40.

また、第1傾斜面24と第2傾斜面42との間にレンズ20と同じ材料から成る粉体が設けられていてもよい。これにより、第1傾斜面24と第2傾斜面42とを密着させる場合と比較して、異物による衝撃を吸収しやすくできる。これは、第1傾斜面24と第2傾斜面42との間に粉体があることによって、第1傾斜面24と第2傾斜面42との間に隙間が形成されるためである。さらに、粉体がレンズ20と同じ材料から成ることによって、温度環境が変化した場合に熱応力が発生することを低減できる。   Further, a powder made of the same material as the lens 20 may be provided between the first inclined surface 24 and the second inclined surface 42. Thereby, compared with the case where the 1st inclined surface 24 and the 2nd inclined surface 42 are closely_contact | adhered, the impact by a foreign material can be absorbed easily. This is because a gap is formed between the first inclined surface 24 and the second inclined surface 42 due to the presence of powder between the first inclined surface 24 and the second inclined surface 42. Furthermore, since the powder is made of the same material as the lens 20, it is possible to reduce the occurrence of thermal stress when the temperature environment changes.

10 レンズユニット
20 レンズ
21 レンズ本体
22 固定部
23 円柱面
24 傾斜面(第1傾斜面)
25 レンズ面
30 レンズ保持体
40 固定手段
41 接触部
42 第2傾斜面
DESCRIPTION OF SYMBOLS 10 Lens unit 20 Lens 21 Lens main body 22 Fixing part 23 Cylindrical surface 24 Inclined surface (1st inclined surface)
25 Lens surface 30 Lens holder 40 Fixing means 41 Contact portion 42 Second inclined surface

Claims (3)

物体側に光軸方向に沿った円柱面を有するレンズ本体と、該レンズ本体の径方向外側に突出し、前記レンズ本体の光軸に沿って像側から前記物体側に向かうに連れて縮径するとともに、前記物体側の表面が傾斜面を有する固定部とを備えたレンズと、
前記固定部において光軸方向に押圧して固定する固定手段とを有するとともに、
前記固定手段が前記固定部のうち前記傾斜面にのみ接触していることを特徴とするレンズユニット。
A lens body having a cylindrical surface along the optical axis direction on the object side, and projecting outward in the radial direction of the lens body, and reducing the diameter from the image side toward the object side along the optical axis of the lens body. And a lens provided with a fixed portion having an inclined surface on the object side surface;
A fixing means for pressing and fixing in the optical axis direction in the fixing portion;
The lens unit, wherein the fixing means is in contact with only the inclined surface of the fixing portion.
前記傾斜面を第1傾斜面としたときに、前記固定手段が前記第1傾斜面に接する第2傾斜面を有するとともに、前記径方向に対する前記第2傾斜面の傾斜角が、前記径方向に対する前記第1傾斜面の傾斜角よりも大きいことを特徴とする請求項1に記載のレンズユニット。   When the inclined surface is the first inclined surface, the fixing means has a second inclined surface in contact with the first inclined surface, and an inclination angle of the second inclined surface with respect to the radial direction is relative to the radial direction. The lens unit according to claim 1, wherein the lens unit is larger than an inclination angle of the first inclined surface. 前記第1傾斜面と前記第2傾斜面との間に前記レンズと同じ材料から成る粉体が設けられていることを特徴とする請求項2に記載のレンズユニット。   The lens unit according to claim 2, wherein powder made of the same material as that of the lens is provided between the first inclined surface and the second inclined surface.
JP2015176738A 2015-09-08 2015-09-08 Lens unit Active JP6633324B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019065201A1 (en) * 2017-09-29 2019-04-04 日本電産サンキョー株式会社 Lens unit

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JP2001051177A (en) * 1999-08-11 2001-02-23 Fuji Photo Film Co Ltd Photographing lens holding method
JP2006113250A (en) * 2004-10-14 2006-04-27 Matsushita Electric Ind Co Ltd Lens unit
JP2009048024A (en) * 2007-08-21 2009-03-05 Sharp Corp Lens unit, imaging module, and optical apparatus
JP2009104100A (en) * 2007-09-27 2009-05-14 Enplas Corp Optical unit
JP2010134378A (en) * 2008-12-08 2010-06-17 Sumitomo Electric Ind Ltd Lens unit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60213916A (en) * 1984-04-09 1985-10-26 Olympus Optical Co Ltd Holding device of optical element
JPH11211958A (en) * 1998-01-29 1999-08-06 Canon Inc Optical device, projecting and exposing device and device production
JP2001051177A (en) * 1999-08-11 2001-02-23 Fuji Photo Film Co Ltd Photographing lens holding method
JP2006113250A (en) * 2004-10-14 2006-04-27 Matsushita Electric Ind Co Ltd Lens unit
JP2009048024A (en) * 2007-08-21 2009-03-05 Sharp Corp Lens unit, imaging module, and optical apparatus
JP2009104100A (en) * 2007-09-27 2009-05-14 Enplas Corp Optical unit
JP2010134378A (en) * 2008-12-08 2010-06-17 Sumitomo Electric Ind Ltd Lens unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019065201A1 (en) * 2017-09-29 2019-04-04 日本電産サンキョー株式会社 Lens unit
JP2019066572A (en) * 2017-09-29 2019-04-25 日本電産サンキョー株式会社 Lens unit
JP7017356B2 (en) 2017-09-29 2022-02-08 日本電産サンキョー株式会社 Lens unit
US11372313B2 (en) 2017-09-29 2022-06-28 Nidec Sankyo Corporation Lens unit

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