JP2711127B2 - Collimator lens - Google Patents
Collimator lensInfo
- Publication number
- JP2711127B2 JP2711127B2 JP2822389A JP2822389A JP2711127B2 JP 2711127 B2 JP2711127 B2 JP 2711127B2 JP 2822389 A JP2822389 A JP 2822389A JP 2822389 A JP2822389 A JP 2822389A JP 2711127 B2 JP2711127 B2 JP 2711127B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- light beam
- focal length
- collimator lens
- 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.)
- Expired - Fee Related
Links
Landscapes
- Lenses (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明はコリメータレンズ、詳しくはレーザープリン
ター等の光走査装置や光ピックアップ装置等に於いて光
源として使用される半導体レーザーからの光束を効率良
く平行光束に変換するためのコリメータレンズに関す
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a collimator lens, more specifically, a light beam from a semiconductor laser used as a light source in an optical scanning device such as a laser printer, an optical pickup device, or the like. The present invention relates to a collimator lens for converting into a parallel light beam.
［従来の技術］ レーザープリンターや光ピックアップ装置に光源とし
て用いられる半導体レーザーから放射される光束は一般
に、接合面に平行な方向で10〜20度、接合面に直交する
方向で20〜35度の半値全角を有する発散性の光束であ
り、一般にはコリメータレンズにより平行光束化して使
用される。[Prior art] A luminous flux emitted from a semiconductor laser used as a light source in a laser printer or an optical pickup device generally has an angle of 10 to 20 degrees in a direction parallel to the bonding surface and 20 to 35 degrees in a direction perpendicular to the bonding surface. It is a divergent light beam having a full width at half maximum, and is generally used after being converted into a parallel light beam by a collimator lens.
半導体レーザーからの発散性の光束を平行光束化する
ためのコリメータレンズは従来から種々提案されている
（例えば、特開昭61-259215号公報、同62-237413号公報
等）。Various collimator lenses for converting a divergent light beam from a semiconductor laser into a parallel light beam have been conventionally proposed (for example, Japanese Patent Application Laid-Open Nos. 61-259215 and 62-237413).
［発明が解決しようとする課題］ 近来、レーザープリンターや光ピックアップ装置も性
能の高度なものが要請され、それに伴いコリメータレン
ズにも従来に増して開口数が大きく、球面収差、コマ収
差等が十分に補正されたものが求められるように成って
きている。[Problems to be Solved by the Invention] In recent years, laser printers and optical pickup devices are required to have high performance, and accordingly, the collimator lens has a larger numerical aperture than before, and has sufficient spherical aberration and coma aberration. It is becoming more and more demanded that the data be corrected.
本発明は、上述の如き事情に鑑みてなされたものであ
って、開口数が大きく結像性能に優れた新規なコリメー
タレンズの提供を目的とする。The present invention has been made in view of the above circumstances, and has as its object to provide a novel collimator lens having a large numerical aperture and excellent imaging performance.
［課題を解決するための手段］ 以下、本発明を説明する。[Means for Solving the Problems] Hereinafter, the present invention will be described.
本発明のコリメータレンズは、半導体レーザーからの
発散性の光束を平行光束化するためのものであって、
「光束射出側から光束入射側に向かって、第１群ないし
第３群の順次配備して」なる。The collimator lens of the present invention is for converting the divergent light beam from the semiconductor laser into a parallel light beam,
"The first group to the third group are sequentially arranged from the light beam emitting side to the light beam incident side."
そして第１群は正レンズ、第２群は光束射出側に凸面
を向けた正メニスカスレンズ、第３群は光束射出側に凹
面を向けた焦点距離の長い正メニスカスレンズであり、
従って３群３枚構成である。The first group is a positive lens, the second group is a positive meniscus lens with a convex surface facing the light beam exit side, and the third group is a positive meniscus lens with a long focal length with a concave surface facing the light beam exit side.
Therefore, it has a three-group, three-element configuration.
全系の合成焦点距離をＦ、第１群と第２群の合成焦点
距離をF1,2、第３群の焦点距離をF3、光束射出側から第
ｉ番目の曲率半径をRi（ｉ＝１〜６）とするとき、これ
らは （Ｉ） 1.01＜F/F1,2＜1.06 （II） 0.03＜F/F3＜0.14 （III） 1.0 ＜F/R3＜1.8 （IV） 0.6 ＜F/|R5｜＜1.5 なる条件を満足する。The combined focal length of the entire system is F, the combined focal length of the first and second units is F 1,2 , the focal length of the third unit is F 3 , and the i-th radius of curvature from the light exit side is R i ( When i = 1 to 6), these are (I) 1.01 <F / F 1,2 <1.06 (II) 0.03 <F / F 3 <0.14 (III) 1.0 <F / R 3 <1.8 (IV) The condition 0.6 <F / | R 5 | <1.5 is satisfied.
［作用］ 上記４条件のうち、条件（Ｉ）と（II）とは球面収差
を良好に補正するための条件であり、これら条件
（Ｉ），（II）の下限を越えると球面収差がアンダーと
なり、上限を越えるとオーバーとなって、残存球面収差
が発生して性能が劣化する。[Operation] Of the above four conditions, the conditions (I) and (II) are conditions for satisfactorily correcting the spherical aberration. When the lower limit of each of the conditions (I) and (II) is exceeded, the spherical aberration becomes under. When the value exceeds the upper limit, the value becomes over, and residual spherical aberration occurs to deteriorate the performance.
条件（III），（IV）はコマ収差を良好に補正するた
めの条件であり、条件（III）の下限を越えると外向性
の、また上限を越えると内向性のコマ収差が発生する。
条件（IV）の下限を越えると内向性のコマ収差が発生
し、上限を越えると外向性のコマ収差が発生して軸外の
性能が劣化し好ましくない。Conditions (III) and (IV) are conditions for satisfactorily correcting coma. Exceeding the lower limit of condition (III) causes inward outward coma and exceeding the upper limit of inward coma.
If the lower limit of the condition (IV) is exceeded, introvertive coma will occur. If the upper limit of the condition (IV) is exceeded, extrovert coma will occur and the off-axis performance will deteriorate, which is not preferable.
［実施例］ 以下、具体的な実施例を７例挙げる。EXAMPLES Seven specific examples will be given below.
各実施例に於いて、光束射出側から第ｉ番目のレンズ
面の曲率半径をRi（ｉ＝１〜６）、第ｉ番目の面間隔を
Di（ｉ＝１〜５）、第ｊ群のレンズの屈折率（波長780n
mの光に対するもの）をN3とする。In each embodiment, the radius of curvature of the i-th lens surface from the light emitting side is R i (i = 1 to 6), and the i-th surface interval is
D i (i = 1 to 5), the refractive index of the lens of the j-th group (wavelength 780 n
m ones to light) is defined as N 3.
また全系の合成焦点距離をＦ、第１群と第２群の合成
焦点距離をF1,2、第３群の焦点距離をF3、開口数をN.A
とする。全系の合成焦点距離Ｆは１に規格化され、長さ
の次元を持つ諸量はＦに対する比率で与えられる。ま
た、各実施例とも厚さ0.3mm、屈折率1.51のカバーガラ
ス（半導体レーザーパッケージのウインドウ部のガラ
ス）の存在を考慮して設計されている。The combined focal length of the entire system is F, the combined focal length of the first and second groups is F 1,2 , the focal length of the third group is F 3 , and the numerical aperture is NA
And The composite focal length F of the whole system is normalized to 1, and various quantities having the dimension of length are given as ratios to F. Further, each embodiment is designed in consideration of the presence of a cover glass (glass in a window portion of a semiconductor laser package) having a thickness of 0.3 mm and a refractive index of 1.51.
実施例１ 第１図に、この実施例のレンズ構成とN.A＝0.3に於け
る光線軌跡を示す。図の左側が光束射出側であり、右側
が光束入射側である。符号U1,U2,U3はそれぞれ第1,第2,
第３群を示す。また、符号Ｇはカバーガラス、符号LDは
半導体レーザーを示している。Embodiment 1 FIG. 1 shows the lens configuration of this embodiment and the ray trajectory at NA = 0.3. The left side of the figure is the light beam exit side, and the right side is the light beam incident side. Symbols U1, U2, U3 are the first, second,
A third group is shown. Reference symbol G indicates a cover glass, and reference symbol LD indicates a semiconductor laser.
Ｆ＝1,F1,2＝0.961,F3＝16.058,N.A＝0.3 F/F1,2＝1.040,F/F3＝0.062 F/R3＝1.204,F/|R5｜＜1.291 ｉ Ri Di ｊ Nj １ 1.590 0.086 １ 1.73818 ２ 8.843 0.081 ３ 0.831 0.169 ２ 1.73818 ４ 3.341 0.145 ５ −0.775 0.148 ３ 1.73818 ６ −0.786 実施例１に関する収差図を第５図に示す。F = 1, F 1,2 = 0.961, F 3 = 16.058, NA = 0.3 F / F 1,2 = 1.040, F / F 3 = 0.062 F / R 3 = 1.204, F / | R 5 | <1.291 i the R i D i j N j 1 1.590 0.086 1 1.73818 2 8.843 0.081 3 0.831 0.169 2 1.73818 4 3.341 0.145 5 -0.775 0.148 3 1.73818 6 -0.786 aberration view relating to example 1 shown in FIG. 5.
実施例２ Ｆ＝1,F1,2＝0.966,F3＝10.839,N.A＝0.3 F/F1,2＝1.035,F/F3＝0.092 F/R3＝1.447,F/|R5｜＝1.170 ｉ Ri Di ｊ Nj １ 1.455 0.121 １ 1.51118 ２ −2.856 0.037 ３ 0.691 0.143 ２ 1.51118 ４ 2.194 0.110 ５ −0.855 0.237 ３ 1.51118 ６ −0.810 実施例２に関する収差図を第６図に示す。Example 2 F = 1, F 1,2 = 0.966, F 3 = 10.839, NA = 0.3 F / F 1,2 = 1.035, F / F 3 = 0.092 F / R 3 = 1.449, F / | R 5 | = indicates 1.170 i R i D i j N j 1 1.455 0.121 1 1.51118 2 -2.856 0.037 3 0.691 0.143 2 1.51118 4 2.194 0.110 5 -0.855 0.237 3 1.51118 6 -0.810 aberration view relating to example 2 in Figure 6.
実施例３ 第２図に、この実施例のレンズ構成とN.A＝0.3に於け
る光線軌跡を示す。各符号は第１図と同じ意味を有す
る。Embodiment 3 FIG. 2 shows the lens configuration of this embodiment and the ray trajectory at NA = 0.3. Each symbol has the same meaning as in FIG.
Ｆ＝1,F1,2＝0.953,F3＝12.277,N.A＝0.3 F/F1,2＝1.049,F/F3＝0.082 F/R3＝1.362,F/|R5｜＝1.202 ｉ Ri Di ｊ Nj １ 8.333 0.099 １ 1.78571 ２ −3.331 0.059 ３ 0.734 0.162 ２ 1.71221 ４ 2.699 0.152 ５ −0.832 0.194 ３ 1.78571 ６ −0.845 実施例３に関する収差図を第７図に示す。F = 1, F 1,2 = 0.953, F 3 = 12.277, NA = 0.3 F / F 1,2 = 1.049, F / F 3 = 0.082 F / R 3 = 1.362, F / | R 5 | = 1.202 i the aberrations in relation to R i D i j N j 1 8.333 0.099 1 1.78571 2 -3.331 0.059 3 0.734 0.162 2 1.71221 4 2.699 0.152 5 -0.832 0.194 3 1.78571 6 -0.845 example 3 shown in Figure 7.
実施例４ Ｆ＝1,F1,2＝0.973,F3＝14.839,N.A＝0.3 F/F1,2＝1.028,F/F3＝0.069 F/R3＝1.667,F/|R5｜＝1.093 ｉ Ri Di ｊ Nj １ 1.752 0.113 １ 1.78571 ２ −4.911 0.047 ３ 0.600 0.134 ２ 1.71221 ４ 0.828 0.131 ５ −0.915 0.162 ３ 1.65949 ６ −0.895 実施例４に関する収差図を第８図に示す。Example 4 F = 1, F 1,2 = 0.973, F 3 = 14.839, NA = 0.3 F / F 1,2 = 1.028, F / F 3 = 0.069 F / R 3 = 1.667, F / | R 5 | = 1.093 i R i D i ij N j 1 1.752 0.113 1 1.78571 2 -4.911 0.047 3 0.600 0.134 2 1.71221 4 0.828 0.131 5 -0.915 0.162 3 1.65949 6 -0.895 An aberration diagram relating to Example 4 is shown in FIG.
実施例５ 第３図に、この実施例のレンズ構成とN.A＝0.3に於け
る光線軌跡を示す。各符号は第１図と同じ意味を有す
る。Embodiment 5 FIG. 3 shows the lens configuration of this embodiment and the ray trajectory at NA = 0.3. Each symbol has the same meaning as in FIG.
Ｆ＝1,F1,2＝0.955,F3＝14.752,N.A＝0.3 F/F1,2＝1.047,F/F3＝0.068 F/R3＝1.456,F/|R5｜＝1.204 ｉ Ri Di ｊ Nj １ 1.153 0.129 １ 1.60909 ２ −5.168 0.026 ３ 0.687 0.153 ２ 1.60909 ４ 1.139 0.123 ５ −0.830 0.170 ３ 1.78571 ６ −0.845 実施例５に関する収差図を第９図に示す。F = 1, F 1,2 = 0.955, F 3 = 14.752, NA = 0.3 F / F 1,2 = 1.047, F / F 3 = 0.068 F / R 3 = 1.456, F / | R 5 | = 1.204 i R i D i j N j 1 1.153 0.129 1 1.60909 2 −5.168 0.026 3 0.687 0.153 2 1.60909 4 1.139 0.123 5 −0.830 0.170 3 1.78571 6−0.845 An aberration diagram for Example 5 is shown in FIG.
実施例６ Ｆ＝1,F1,2＝0.980,F3＝18.097,N.A＝0.3 F/F1,2＝1.020,F/F3＝0.055 F/R3＝1.546,F/|R5｜＝0.789 ｉ Ri Di ｊ Nj １ 1.957 0.010 １ 1.78571 ２ −9.650 0.045 ３ 0.647 0.133 ２ 1.71221 ４ 1.163 0.133 ５ −1.267 0.162 ３ 1.78571 ６ −1.229 実施例６に関する収差図を第10図に示す。Example 6 F = 1, F 1,2 = 0.980, F 3 = 18.097, NA = 0.3 F / F 1,2 = 1.020, F / F 3 = 0.055 F / R 3 = 1.546, F / | R 5 | = indicates 0.789 i R i D i j N j 1 1.957 0.010 1 1.78571 2 -9.650 0.045 3 0.647 0.133 2 1.71221 4 1.163 0.133 5 -1.267 0.162 3 1.78571 6 -1.229 aberration view relating to example 6 in FIG. 10.
実施例７ 第４図に、この実施例のレンズ構成とN.A＝0.3に於け
る光線軌跡を示す。各符号は第１図と同じ意味を有す
る。Embodiment 7 FIG. 4 shows the lens configuration of this embodiment and the ray trajectory at NA = 0.3. Each symbol has the same meaning as in FIG.
Ｆ＝1,F1,2＝0.964,F3＝10.744,N.A＝0.3 F/F1,2＝1.037,F/F3＝0.093 F/R3＝1.372,F/|R5｜＝1.253 ｉ Ri Di ｊ Nj １ −11.667 0.100 １ 1.82485 ２ −1.933 0.045 ３ 0.729 0.133 ２ 1.71221 ４ 2.208 0.133 ５ −0.798 0.233 ３ 1.51118 ６ −0.766 実施例７に関する収差図を第11図に示す。F = 1, F 1,2 = 0.964, F 3 = 10.744, NA = 0.3 F / F 1,2 = 1.037, F / F 3 = 0.093 F / R 3 = 1.372, F / | R 5 | = 1.253 i the aberrations in relation to R i D i j N j 1 -11.667 0.100 1 1.82485 2 -1.933 0.045 3 0.729 0.133 2 1.71221 4 2.208 0.133 5 -0.798 0.233 3 1.51118 6 -0.766 example 7 shown in Figure 11.
各実施例とも諸収差が良好に補正されている。 In each embodiment, various aberrations are satisfactorily corrected.
なお、上の各実施例に於いて１に規格化された全系の
焦点距離Ｆの実際の値は30mmである。In the above embodiments, the actual value of the focal length F of the entire system standardized to 1 is 30 mm.
［発明の効果］ 以上、本発明によれば新規なコリメータレンズを提供
できる。このコリメータレンズは開口数が大きく、且つ
結像性能が良いので、半導体レーザーからの発散性の光
束を効率良く、且つ良好に平行光束化できる。また３群
３枚構成とコンパクトであり、軸外性能が良いのでアラ
イメントも容易である。[Effects of the Invention] As described above, according to the present invention, a novel collimator lens can be provided. Since this collimator lens has a large numerical aperture and good imaging performance, it can efficiently and satisfactorily convert a divergent light beam from a semiconductor laser into a parallel light beam. In addition, since it is compact with a three-group three-element structure and has good off-axis performance, alignment is easy.
第１図は、実施例１のレンズ構成を示す図、第２図は、
実施例３のレンズ構成を示す図、第３図は、実施例５の
レンズ構成を示す図、第４図は、実施例７のレンズ構成
を示す図、第５図ないし第11図は順次、実施例１ないし
７に関する諸収差の図である。 U1……第１群、U2……第２群、U3……第３群、Ｇ……カ
バーガラス、LD……半導体レーザーFIG. 1 is a diagram showing a lens configuration of Example 1, and FIG.
FIG. 3 is a diagram showing a lens configuration of Example 5, FIG. 4 is a diagram showing a lens configuration of Example 7, FIG. 5 to FIG. FIG. 10 is a diagram of various aberrations in Examples 1 to 7. U1 first group, U2 second group, U3 third group, G cover glass, LD semiconductor laser
Claims (1)
１群ないし第３群を順次配備してなり、 第１群は正レンズ、第２群は光束射出側に凸面を向けた
正メニスカスレンズ、第３群は光束射出側に凹面を向け
た焦点距離の長い正メニスカスレンズである３群３枚構
成であり、 全系の合成焦点距離をＦ、第１群と第２群の合成焦点距
離をF1,2、第３群の焦点距離をF3、光速射出側から第ｉ
番目のレンズ面の曲率半径をRi（ｉ＝１〜６）とすると
き、これらが （Ｉ） 1.01＜F/F1,2＜1.06 （II） 0.03＜F/F3＜0.14 （III） 1.0 ＜F/R3＜1.8 （IV） 0.6 ＜F/|R5｜＜1.5 なる条件を満足することを特徴とするコリメータレン
ズ。1. A first group, a third group, and a third group are sequentially disposed from a light beam emitting side to a light beam incident side. The first group is a positive lens, and the second group is a positive lens having a convex surface facing the light beam emitting side. The meniscus lens, the third unit, is a positive meniscus lens having a long focal length with a concave surface facing the light exit side, and has a three-element configuration. The combined focal length of the entire system is F, and the combination of the first and second units is The focal length is F 1,2 , the focal length of the third lens unit is F 3 , and the i-th lens from the light emission side
Assuming that the curvature radius of the second lens surface is R i (i = 1 to 6), these are (I) 1.01 <F / F 1,2 <1.06 (II) 0.03 <F / F 3 <0.14 (III) 1.0 <F / R 3 <1.8 (IV) 0.6 <F / | R 5 | <1.5 A collimator lens that satisfies the following condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2822389A JP2711127B2 (en) | 1989-02-07 | 1989-02-07 | Collimator lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2822389A JP2711127B2 (en) | 1989-02-07 | 1989-02-07 | Collimator lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02207209A JPH02207209A (en) | 1990-08-16 |
| JP2711127B2 true JP2711127B2 (en) | 1998-02-10 |
Family
ID=12242615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2822389A Expired - Fee Related JP2711127B2 (en) | 1989-02-07 | 1989-02-07 | Collimator lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2711127B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208640A (en) * | 2016-09-19 | 2020-05-29 | 玉晶光电(厦门)有限公司 | Eyepiece optical system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123535B (en) * | 2018-10-31 | 2021-06-11 | 上海微电子装备（集团）股份有限公司 | Optical alignment system |
| CN111123489B (en) * | 2018-11-01 | 2021-11-16 | 新巨科技股份有限公司 | Three-piece thin imaging lens group |
| CN113866994B (en) * | 2020-06-30 | 2023-04-18 | 上海微电子装备（集团）股份有限公司 | Collimating lens and image sensor |
-
1989
- 1989-02-07 JP JP2822389A patent/JP2711127B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208640A (en) * | 2016-09-19 | 2020-05-29 | 玉晶光电(厦门)有限公司 | Eyepiece optical system |
| CN111208640B (en) * | 2016-09-19 | 2022-04-08 | 玉晶光电(厦门)有限公司 | Eyepiece optical system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02207209A (en) | 1990-08-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6807019B2 (en) | Objective lens having diffractive structure for optical pick-up | |
| US4756583A (en) | Scanning optical system for use in a laser beam printer | |
| EP0886162B1 (en) | Light source equipment, optical scanner and data reading apparatus using the same | |
| EP0605923A1 (en) | Beam-shaping optical element, and radiation source unit and scanning unit including said element | |
| US6061183A (en) | Collimator lens and light-scanning apparatus using the same | |
| RU97117463A (en) | LENS LENS AND OPTICAL SENSOR DEVICE WITH LENS LENS | |
| JP2000187172A (en) | Optical scanner | |
| US6396640B2 (en) | Collimator lens and optical scanning apparatus using the same | |
| US4744073A (en) | Recording/reproducing optical system utilizing semiconductor laser light source and anamorphic imaging element | |
| US4863227A (en) | Light scanning device | |
| US4707085A (en) | Fθ lens for use in light beam scanner | |
| US6236512B1 (en) | Collimator lens and light-scanning apparatus using the same | |
| US4842388A (en) | Single optical lense with diffraction limit converging capability and wide field angle | |
| JP2711127B2 (en) | Collimator lens | |
| GB2212292A (en) | Scanning optical system for use in laser beam printer | |
| JPH05303766A (en) | Optical element for optical disk and optical head using the same | |
| US5247385A (en) | Fθ lens and lens for forming linear image | |
| JPH0348487B2 (en) | ||
| US4556296A (en) | Objective lens for use with information storage disks | |
| JP3767167B2 (en) | Optical system | |
| RU2093870C1 (en) | Telescopic system for infra-bed radiation (variants) | |
| JPH08234097A (en) | Optical lens system | |
| US5311348A (en) | Cylindrical lens system for use in laser beam scanning apparatus and scanning apparatus including same | |
| JPH0754376B2 (en) | Optical disk device | |
| US4447138A (en) | Objective system for video disc |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |