JPS61210307A - Lens frame - Google Patents
Lens frameInfo
- Publication number
- JPS61210307A JPS61210307A JP5045285A JP5045285A JPS61210307A JP S61210307 A JPS61210307 A JP S61210307A JP 5045285 A JP5045285 A JP 5045285A JP 5045285 A JP5045285 A JP 5045285A JP S61210307 A JPS61210307 A JP S61210307A
- Authority
- JP
- Japan
- Prior art keywords
- lens frame
- lens
- outside
- fitted
- lens holder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明はビデオ゛カメラ用レンズ、写真レンズ等に使用
される鏡枠において、特に高いレンズ倒れ精度が必要な
部分に好適なレンズ鏡枠に関する０
〔発明の背景〕
従来のレンズ俊枠の一例は、例えば実開昭５２−６６２
７ 号公報に示されるような、摺動自在な嵌合部を設
けて、レンズの偏心、倒れを防止するものがあるが、複
雑な構造及び調整を必要とする。また、別の例として第
５図に示すような例もある。第５図はレンズ鏡枠の要部
を示す図で、１はフォーカス環、２は前玉ホルダ。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a lens frame suitable for use in video camera lenses, photographic lenses, etc. where particularly high lens tilting accuracy is required. [Background of the Invention] An example of a conventional lens frame is
There is a method, as shown in Japanese Patent No. 7, in which a slidable fitting part is provided to prevent eccentricity and tilting of the lens, but this requires a complicated structure and adjustment. Moreover, there is also an example as shown in FIG. 5 as another example. FIG. 5 is a diagram showing the main parts of the lens barrel, where 1 is a focus ring and 2 is a front lens holder.
３は偏心ビン、４は間隔環、５．６はレンズ。3 is an eccentric bin, 4 is a spacing ring, and 5.6 is a lens.
である。第６図はフォーカス環１及び前玉ホルダ２の円
柱部の形状を示す図であり、２１はフォーカス環１の内
側円柱部の形状を真円からの誤差を強調して示した真円
度形状、２２は真円度形状２１の内接円、２３は前玉ホ
ルダ２の外側円柱部の形状を真円からの誤差を強調して
示した真円度形状、２４は真円度形状２３の外接円であ
る。このような第５図に示し九例に於いては、フォーカ
ス環１の内側円柱部の内接円２２よりも、前玉ホルダ２
の外側円柱部の外接円２４の方が小さいため、該嵌合部
に「かた」が生じ、レンズ倒れを鰐発する。そのため、
偏心ピン３を円周上数ケ所１ｃ 設ｆｆてレンズ倒れ調
整を行ない、レンズ倒れの防止を行なっているが、調整
が必要であり、さらに偏心ピン３を設けるため構造が複
雑になるという問題があった。It is. FIG. 6 is a diagram showing the shapes of the cylindrical portions of the focus ring 1 and the front lens holder 2, and 21 is a circularity shape showing the shape of the inner cylindrical portion of the focus ring 1 with emphasis on the error from a perfect circle. , 22 is the inscribed circle of the circularity shape 21, 23 is the circularity shape showing the shape of the outer cylinder part of the front lens holder 2 with the error from a perfect circle emphasized, and 24 is the circularity shape of the circularity shape 23. It is a circumcircle. In the nine examples shown in FIG. 5, the front lens holder 2
Since the circumscribed circle 24 of the outer cylindrical portion of the lens is smaller, the fitting portion is skewed, causing the lens to fall. Therefore,
Eccentric pins 3 are installed at several locations on the circumference to adjust the lens inclination and prevent the lens from inclining; however, adjustment is required, and the provision of the eccentric pins 3 complicates the structure. there were.
本発明の目的は、調整や複雑な構造を必要とせずに、レ
ンズの偏心、倒れに対して高精度が得られるレンズ鏡枠
を低コストで実現することにある。An object of the present invention is to realize at low cost a lens frame that can provide high accuracy with respect to eccentricity and tilting of the lens without requiring adjustment or complicated structure.
本発明は内外部鏡枠の「かた」を低減すれば、内部鏡枠
内レンズの偏心、倒れが低減できることに着目し、「か
た」低減方法として内外部鏡枠を正大公差とすることを
特徴とするものである。そして、少なくとも外部鏡枠を
プラスチック材で構成することにより、圧入時に弾性変
形して組込が容易に可能になるため、複雑な構造を必要
としない特徴がある。The present invention focuses on the fact that eccentricity and tilting of the lens in the inner lens frame can be reduced by reducing the "height" of the inner and outer lens frames, and as a method for reducing "height", the inner and outer lens frames have a positive tolerance. It is characterized by: Furthermore, by constructing at least the external lens frame from a plastic material, it is elastically deformed during press-fitting and can be easily assembled, so that it does not require a complicated structure.
〔発明の実施例〕
以下本発明の一実施例をｉｔ図、＠２図により説明する
。第１図は本発明による鏡枠の主要部を示す断面図で、
３１はフォーカス環、３２は前玉ホルダ、３３は間隔環
、 ３４．３５はレンズ玉、６６はフォーカス環内側円
柱部、５７は前玉ホルダ外側円柱部である。−例として
、フォーカス環３１はプラスチック材（ＰＣＧ等）で構
成し、前玉ホルダ３２をアルミ材で構成する。フォーカ
ス環３１と前玉ホルダ３２とは、ねじ部と円柱部とで嵌
合されており、その寸法関係の一例を第３．４図に示す
。第３図はフォーカス環３１の断面図で、前玉ホルダ５
２と嵌合する内側ねじ部はＭ ５２．２Ｐ ［１，７５
のねじが形成され、円柱部内接円径は０．０４
φ５０＋ とする。第４図は前玉ホルダ５２の断面図
で、フォーカス環３１と嵌合する外側ねじ部はＭ５２Ｐ
ＣＬ７５のねじが形成され、円柱部外接円＋０．０３
径をφ５０１円柱部元軸方向嵌合長さを１（１１１１＋
１０２
とする。このような寸法のフォーカス環３１と前玉ホル
ダ５２との嵌合において、ねじ部は径がＭ５２．２と〜
１５２との直径で０．２絹の差が有り、円柱部は、
ΔＤ＝（フォーカス塊内接円径）−（前玉ホルダ外接円
径） ＝ （−０，０５〜０．０２ ）となるため、ね
じ部は円柱部に比べ完全に逃げ寸法となっている。その
ため、前記嵌合は、円柱部によってのみ規制される。Δ
Ｄと、フォーカス環３１に対する前玉ホルダ３２の倒れ
（この倒れ値がレンズ５４、５５の倒れに寄与する。）
の関係において、−０，０３６３０５００時は、前記円
柱部嵌合が圧入状態となっているため、前記倒れは０分
、ΔＤ＝０．０２の時は前記円柱部嵌合の長さがｉｏｍ
のため、前記倒れは
６０ Ｘ ｔａｎ−’ ０．０２７１０ ＝ ７ （ｆ
ｉ）とな９、前記倒れを７分以下とすることができる。[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to an IT diagram and @2 diagram. FIG. 1 is a sectional view showing the main parts of the lens frame according to the present invention.
31 is a focus ring, 32 is a front lens holder, 33 is a spacing ring, 34, 35 is a lens lens, 66 is an inner cylindrical portion of the focus ring, and 57 is an outer cylindrical portion of the front lens holder. - For example, the focus ring 31 is made of a plastic material (such as PCG), and the front lens holder 32 is made of an aluminum material. The focus ring 31 and the front lens holder 32 are fitted through a threaded portion and a cylindrical portion, and an example of their dimensional relationship is shown in FIG. 3.4. FIG. 3 is a sectional view of the focus ring 31 and the front lens holder 5.
The inner thread that fits with 2 is M52.2P [1,75
A thread is formed, and the inscribed circle diameter of the cylindrical part is 0.04 φ50+. FIG. 4 is a sectional view of the front lens holder 52, and the outer threaded portion that fits into the focus ring 31 is M52P.
A CL75 thread is formed, and the diameter is φ501, the circumscribed circle of the cylinder part is +0.03, and the fitting length in the original axial direction of the cylinder part is 1 (1111 +
102. In fitting the focus ring 31 with such dimensions and the front lens holder 52, the threaded portion has a diameter of M52.2.
There is a difference of 0.2 silk in diameter from 152, and the cylinder part becomes ΔD = (focus block inscribed circle diameter) - (front lens holder circumscribed circle diameter) = (-0.05 to 0.02) Therefore, the threaded part has a complete relief dimension compared to the cylindrical part. Therefore, the fitting is restricted only by the cylindrical portion. Δ
D and the tilting of the front lens holder 32 with respect to the focus ring 31 (this tilting value contributes to the tilting of the lenses 54 and 55).
In the relationship, when -0,03630500, the column fitting is in a press-fit state, so the tilt is 0 minutes, and when ΔD=0.02, the length of the column fitting is iom
Therefore, the collapse is 60 X tan-' 0.02710 = 7 (f
i) And 9, the said collapse can be made 7 minutes or less.
ねじ部に沿って回転しｆｋから組込む組込性については
、−０，０３≦ΔＤ≦００時の正大公差時には、フォー
カス−５１の肉厚を１５〜２．５朋、前玉ホルダ３２の
肉厚を１〜１．５間とすれば最大３０μｍの圧入におい
てフォーカス環３１及び前玉ホルダ３２の弾性変形によ
り組込可能となり問題ない。第２図は圧入時の円柱部の
状態を示す図でちゃ、前記と同様にフォーカス環の内側
円柱部と前玉ホルダの外側円柱部の真円度形状の例を示
す。Regarding the assemblability of rotating along the threaded part and assembling from fk, when there is a positive tolerance when -0,03≦ΔD≦00, the wall thickness of the focus-51 is 15 to 2.5 mm, and the wall thickness of the front lens holder 32 is If the thickness is between 1 and 1.5, the focus ring 31 and the front lens holder 32 can be assembled by elastic deformation when press-fitted with a maximum thickness of 30 μm, and there is no problem. FIG. 2 is a diagram showing the state of the cylindrical portion during press-fitting, and similarly to the above, it shows an example of the circularity shape of the inner cylindrical portion of the focus ring and the outer cylindrical portion of the front lens holder.
４１は、フォーカス環３１の内側円柱部３６の真円度形
状、４２は仁の真円度形状４１の内接円、４５は前玉ホ
ルダ５２の外側円柱部３７の真円度形状、４４はこの真
円度形状４５の外接円である。41 is the circularity shape of the inner cylindrical portion 36 of the focus ring 31, 42 is the inscribed circle of the roundness shape 41, 45 is the circularity shape of the outer cylindrical portion 37 of the front lens holder 52, and 44 is the circularity shape of the outer cylindrical portion 37 of the front lens holder 52. This is the circumcircle of this roundness shape 45.
なお、従来例によるこのような嵌合での前玉ホルダの倒
れを求めると、ΔＤ＝０〜０．０５ となるため、倒れ
は、０分〜１７分となり、本発明に比べ約２．５倍とな
ってしまう。In addition, when determining the tilting of the front lens holder in such a fitting according to the conventional example, ΔD=0 to 0.05, so the tilting is 0 minutes to 17 minutes, which is about 2.5 minutes compared to the present invention. It will double.
〔発明の効果〕
以上述べたように、本発明によれば、第１図に示すよう
な簡単な構造のみでフォーカス環に対する前玉ホルダの
倒れが低減できるので、偏心ピンによる倒れ調整等の複
雑な構造や困難な調整をすることなく、安価な鏡枠が実
現できるという効果がある。[Effects of the Invention] As described above, according to the present invention, the tilting of the front lens holder with respect to the focus ring can be reduced with only the simple structure shown in FIG. This has the effect of making it possible to create an inexpensive mirror frame without having to make complicated structures or difficult adjustments.
Ｍ１図は本発明の一実施例による鏡枠１間隔環、レンズ
玉の断面図、第２図は円柱部３６と円柱部３７の嵌合状
態を示す説明図、ＷＪ３図は本発明のフォーカス環の一
例を示す断面図、第４図は本発明の前玉ホルダの一例を
示す断面図、第５図は従来例による鏡枠１間隔環、レン
ズ玉の断面図、第６図は従来のフォーカス環の内側円柱
部と前玉ホルダの外側円柱部の嵌合状態を示す説明図で
ある。
１．３１・・・フォーカス環 ２．３２・・・前玉ホル
ダ４．３５・・・間１１Ａ環 ５，６，５４．５５・・
・レンズ玉４１・・・フォーカス環３１の内側円柱部の
真円度形状 ４２・・・真円度形状４１の内接円 ４３
・・・前玉ホルダ３２の外側円柱部の真円度形状 ４４
・・・真円度形状４３の外接円Figure M1 is a sectional view of the lens barrel and the lens ball according to an embodiment of the present invention, Figure 2 is an explanatory diagram showing the fitted state of the cylindrical part 36 and the cylindrical part 37, and Figure WJ3 is the focus ring of the present invention. 4 is a sectional view showing an example of the front lens holder of the present invention, FIG. 5 is a sectional view of a conventional lens barrel and lens lens, and FIG. 6 is a sectional view of a conventional focus lens. It is an explanatory view showing a fitted state of the inner cylinder part of the ring and the outer cylinder part of the front ball holder. 1.31...Focus ring 2.32...Front lens holder 4.35...Interval 11A ring 5,6,54.55...
- Lens ball 41... Circularity shape of the inner cylinder part of the focus ring 31 42... Inscribed circle of the circularity shape 41 43
...Circularity shape of the outer cylinder part of the front lens holder 32 44
... Circumcircle of circularity shape 43
Claims (1)
柱部とを有する内部鏡枠と、この内部鏡枠と嵌合するね
じ部と円柱部とを内側に有し、上記内部鏡枠がねじ部に
沿つて回転されて組込まれる外部鏡枠とを備え、上記内
部鏡枠を金属又はプラスチック材で構成し、上記外部鏡
枠をプラスチック材で構成するとともに、上記内部鏡枠
の上記円柱部の外接円の直径が上記外部鏡枠の上記円柱
部の内接円の直径より大きくして、両者の円柱部を圧入
寸法としたことを特徴とするレンズ鏡枠。an internal lens frame that holds a lens group and a spacing ring on the inside and has a threaded part and a cylindrical part on the outside; and a threaded part and a cylindrical part that fit with the internal lens frame on the inside; an external lens frame that is rotated along a threaded portion to be assembled, the internal lens frame is made of metal or plastic material, the external lens frame is made of plastic material, and the cylindrical column of the internal lens frame is made of a plastic material. A lens barrel characterized in that a diameter of a circumscribed circle of the external lens frame is larger than a diameter of an inscribed circle of the cylindrical portion of the external lens frame, and both cylindrical portions are press-fitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5045285A JPS61210307A (en) | 1985-03-15 | 1985-03-15 | Lens frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5045285A JPS61210307A (en) | 1985-03-15 | 1985-03-15 | Lens frame |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61210307A true JPS61210307A (en) | 1986-09-18 |
Family
ID=12859250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5045285A Pending JPS61210307A (en) | 1985-03-15 | 1985-03-15 | Lens frame |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61210307A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008216707A (en) * | 2007-03-06 | 2008-09-18 | Fujinon Corp | Lens assembly and photographing device |
| JP2009085997A (en) * | 2007-09-27 | 2009-04-23 | Canon Inc | Lens barrel and optical equipment |
-
1985
- 1985-03-15 JP JP5045285A patent/JPS61210307A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008216707A (en) * | 2007-03-06 | 2008-09-18 | Fujinon Corp | Lens assembly and photographing device |
| JP2009085997A (en) * | 2007-09-27 | 2009-04-23 | Canon Inc | Lens barrel and optical equipment |
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