JP3569379B2 - Shooting lens system - Google Patents
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- JP3569379B2 JP3569379B2 JP06351696A JP6351696A JP3569379B2 JP 3569379 B2 JP3569379 B2 JP 3569379B2 JP 06351696 A JP06351696 A JP 06351696A JP 6351696 A JP6351696 A JP 6351696A JP 3569379 B2 JP3569379 B2 JP 3569379B2
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Description
【０００１】
【技術分野】
本発明は、固体撮像素子で撮影するＩＴＶカメラ、ビデオカメラ、電子スチルカメラ等に適した撮影レンズ系に関する。
【０００２】
【従来技術及びその問題点】
近年、固体撮像素子（ＣＣＤ等）で撮影画像を記録するいわゆる電子スチルカメラ等の要望が高まっている。このような電気的画像素子を使用するカメラの撮影レンズ系は、フィルムを使用する写真レンズに比べて、次のような特性が要求される。
【０００３】
▲１▼電気的画像素子は一般的にフィルムよりラチチュードが狭いため、周辺光量を充分にとるべく開口効率をほぼ１００％にする。
▲２▼上記▲１▼を満足しても、電気的画像素子の構造上、周辺光量の低下や色ズレが発生するため、主光線を全画面に対して垂直に近い角度で入射させる。
▲３▼レンズと結像面の間に、モアレ除去のための光学的ローパスフィルター、分光感度を補正するための赤外カットフィルター、あるいは結像面の保護と防塵のための光学部材等の配置スペースを確保する必要があり、長いバックフォーカスを要する。
【０００４】
このような目的で既に、▲１▼特開昭４９−５３０３６号公報、▲２▼特開昭５７−１６４７０８号公報、▲３▼特公平７−９５１４１号公報等の撮影レンズ系が提案されている。しかし、▲１▼は半画角が１６．５°と狭く、▲２▼は口径比が１：４．３程度で暗く、▲３▼は半画角１９．５°で口径比１：２．８であり、しかも、▲１▼〜▲３▼のいずれも、最小の屈折面の曲率半径は焦点距離の半分程度またはそれ以下と小さいため、画面サイズが小さくなる程レンズ加工が困難になり製造コストが高くなるという問題点がある。
【０００５】
【発明の目的】
本発明は、半画角２０゜程度で、口径比１：２．０程度と明るく、しかも収差補正が良好で、レンズ加工が簡単で安価にできる、固体撮像素子を利用したカメラに適した撮影レンズ系を得ることを目的とする。特に、各レンズの曲率半径が比較的大きく、画面サイズが小さくなっても、レンズ加工が容易な撮影レンズ系を得ることを目的とする。
【０００６】
【発明の概要】
本発明の撮像レンズ系は、物体側から順に、両凸の第１レンズと、物体側に強い凹面を向けた両凹の第２レンズと、像側に強い凸面を向けた正の第３レンズと、物体側に強い凸面を向けた第４レンズとの４枚の単レンズからなり、第４レンズのシェイピングファクターが下記条件式（１）を満足し、第２レンズの両面の曲率半径の比が、下記条件式（２）を満足することを特徴としている。
（１）０．５５２７≦（ｒ8 ＋ｒ7 ）／（ｒ8 -ｒ7 ）≦０．９０２１
（２）０．４＜｜ｒ3 ／ｒ4 ｜＜１．２
但し、
ｒ 7 ：第４レンズの物体側の面の曲率半径、
ｒ 8 ：第４レンズの像側の面の曲率半径、
ｒ 3 ：第２レンズの物体側の面の曲率半径、
ｒ 4 ：第２レンズの像側の面の曲率半径、
である。
【０００８】
本発明の撮影レンズ系は、第２レンズと第３レンズの互いに対向する面のパワーの和が、条件式（３）を満足することが好ましい。
（３）-１．１＜φr4＋φr5＜-０．１
但し、
φr4：第２レンズの像側の面の面パワー、
φr5：第３レンズの物体側の面の面パワー、
である。
【０００９】
また、第１レンズの像側の面ｒ2 より、第４レンズの像側の面ｒ7 までの軸上寸法が、条件式（４）を満足することが好ましい。
（４）１．１＜Σｄi ＜１．７ （ｉ＝２〜７）
但し、
ｄi ：物体側から数えて第ｉ面と第（ｉ＋１）面の軸上間隔、
である。
【００１０】
絞は、第１レンズと第２レンズの間に配置する。
【００１１】
【発明の実施の形態】
本発明の撮影レンズ系は、物体側より順に、両凸の第１レンズと、物体側に強い凹面を向けた両凹の第２レンズと、像側に強い凸面を向けた正の第３レンズと、物体側に強い凸面を向けた第４レンズとの４枚の単レンズから構成し、比較的各レンズの曲率半径を大きくして、画面サイズが小さくなってもレンズ加工が簡単で安価にでき、かつ口径比１：２．０程度と明るく収差補正が良好で、しかも固定撮像素子を利用したカメラに適した撮影レンズ系を得たものである。
【００１２】
条件式（１）は、最も像側の第４レンズのシェイピングファクターに関するもので、５°程度以下のテレセントリックにするために必要な条件である。条件式（１）の下限を越えると、テレセントリック角（結像面に入射する軸外主光線の入射角）がマイナス（内側に傾く）になり過ぎる。上限を越えると、テレセントリック角が５°以上となり本発明の目的が達成できなくなる。
【００１３】
条件式（２）は、レンズ全系中、唯一の負レンズである第２レンズの両側の面の曲率半径の比の範囲に関し、球面収差とコマ収差を良好に補正するための条件である。第２レンズの物体側の屈折面ｒ3 の曲率半径が小さくなるか、または像側の屈折面ｒ4 の曲率半径が大きくなって条件式の下限を越えると、過剰の球面収差の補正ができなくなり、内方コマが大きく発生する。逆にｒ3 が大きくなるか、ｒ4 が小さくなって条件式の上限を越えると、球面収差が補正不足となり、外方コマが発生し良好な結像性能が得られなくなる。
【００１４】
条件式（３）は、第２レンズと第３レンズの対向面間によって構成される空気レンズの面のパワーの和の範囲を表し、コマフレアーの発生を抑え、像面のバランスをとるための条件である。下限を越えて負のパワーが強くなると、下光線によるコマフレアーが外側に大きく発生し、像面湾曲が補正過剰となる。上限を越えて負のパワーが弱くなると、下光線によるコマフレアーが内側に大きく発生し、像面湾曲が補正不足となるので、結像性能が保てなくなる。
【００１５】
条件式（４）は、開放絞が配置される第１レンズと第２レンズの間隔と第２レンズから第４レンズまでの軸上寸法の合計の範囲を規定するもので、軸外主光線を結像面（撮像面）に対して５°程度以下で入射させるために必要な条件である。したがって条件式（４）の下限を越えて軸上寸法が短くなると、結像面に入射する軸外主光線の入射角を５°程度以下に抑えることができなくなり、同時に第３レンズ及び第４レンズのコバ厚が薄くなるので、特に画面サイズが小さい場合に、レンズの加工、組立が困難になる。上限を越えて、この軸上寸法が長くなると、バックフォーカスが短くなり、ローパスフィルターや赤外カットフィルター等の光学部材の配置が困難になる。
【００１６】
以下、具体的な数値実施例について、本発明を説明する。以下の実施例１ないし４は、いずれも、物体側から順に、両凸の第１レンズ１０、絞Ｓ、両凹の第２レンズ２０、正の第３レンズ３０及び両凸の第４レンズ４０からなっている。第３レンズは、メニスカスレンズからなる実施例２を除いて両凸レンズからなり、いずれも、像側に強い凸面を備えている。第４レンズの後方には、実施例１ないし実施例４では、ローパスフィルター及び撮像素子のカバーガラスＣＧが配置され、実施例５及び実施例６では、撮像素子のカバーガラスＣＧのみが配置されている。カバーガラスＣＧの像側の面は撮像面である。
【００１７】
［実施例１］
図１及び図２は、本発明の撮影レンズ系の第１の実施例を示すもので、図１はそのレンズ構成図、図２はその諸収差図である。
このレンズ系の具体的数値データを表１に示す。諸収差図中、ＳＡは球面収差、ＳＣは正弦条件、ｄ線、ｇ線、Ｃ線、それぞれの波長における、球面収差によって示される色収差、Ｓはサジタル、Ｍはメリディオナルを示している。
【００１８】
表および図面中、ＦＮＯ はＦナンバー、Ｆ は焦点距離、Ｗ は半画角、ｆＢはバックフォーカスを表す。Ｒは曲率半径、Ｄはレンズ厚またはレンズ間隔、Ｎｄ はｄ線の屈折率、νはｄ線のアッベ数を示す。バックフォーカスｆＢは、第４レンズ最終面（ｒ８面）からカバーガラスＣＧの像側面（撮像面、ｒ１１ ）迄の距離の空気換算距離である（ｆＢ＝ｄ８＋（ｄ９／Ｎ９）＋（ｄ１０／Ｎ１０））。
【００１９】
【表１】
［実施例２］
図３及び図４は、本発明の撮影レンズ系の第２の実施例を示すもので、図３はレンズ構成図、図４は諸収差図、表２は具体的数値データである。
【００２１】
【表２】
［実施例３］
図５及び図６は、本発明の撮影レンズ系の第３の実施例を示すもので、図５はレンズ構成図、図６は諸収差図、表３は具体的数値データである。
【００２７】
【表３】
［実施例４］
図７及び図８は、本発明の撮影レンズ系の第４の実施例を示すもので、図７はレンズ構成図、図８は諸収差図、表４は具体的数値データである。
【００２９】
【表４】
次に、実施例１ないし４の各条件式に対する値を表５に示す。
【表５】
表５から明らかなように、実施例１ないし実施例４の数値は、条件式（１）ないし（４）を満足している。また、収差図から明らかなように、各収差も良好に補正されている。
【００３２】
【発明の効果】
本発明によれば、半画角２０゜程度で、口径比１：２．０程度と明るく、しかも収差補正が良好で、レンズ加工が簡単で安価にできる、固体撮像素子を利用したカメラに適した撮影レンズ系を得ることができる。
【図面の簡単な説明】
【図１】本発明による撮影レンズ系の第１の実施例のレンズ構成図である。
【図２】図１のレンズ系の諸収差図である。
【図３】本発明による撮影レンズ系の第２の実施例のレンズ構成図である。
【図４】図３のレンズ系の諸収差図である。
【図５】本発明による撮影レンズ系の第３の実施例のレンズ構成図である。
【図６】図５のレンズ系の諸収差図である。
【図７】本発明による撮影レンズ系の第４の実施例のレンズ構成図である。
【図８】図７のレンズ系の諸収差図である。[0001]
【Technical field】
The present invention relates to a photographic lens system suitable for an ITV camera, a video camera, an electronic still camera, and the like for photographing with a solid-state imaging device.
[0002]
[Prior art and its problems]
2. Description of the Related Art In recent years, there has been an increasing demand for a so-called electronic still camera that records a captured image with a solid-state imaging device (CCD or the like). A photographing lens system of a camera using such an electric image element is required to have the following characteristics as compared with a photographic lens using a film.
[0003]
{Circle around (1)} Since the latitude of an electric image element is generally narrower than that of a film, the aperture efficiency is set to almost 100% in order to obtain a sufficient amount of peripheral light.
{Circle around (2)} Even if the above {1} is satisfied, a decrease in the peripheral light amount and a color shift occur due to the structure of the electric image element. Therefore, the principal ray is incident on the entire screen at an angle close to perpendicular.
{Circle around (3)} An optical low-pass filter for removing moire, an infrared cut filter for correcting spectral sensitivity, or an optical member for protecting and dust-proofing the image plane between the lens and the image plane. Space needs to be secured and a long back focus is required.
[0004]
For such purposes, photographic lens systems such as (1) Japanese Patent Application Laid-Open No. 49-53036, (2) Japanese Patent Application Laid-Open No. 57-164708, and (3) Japanese Patent Publication No. 7-95141 have been proposed. I have. However, (1) has a narrow half angle of view of 16.5 °, (2) is dark with an aperture ratio of about 1: 4.3, and (3) has a half angle of view of 19.5 ° and an aperture ratio of 1: 2. In addition, in any of (1) to (3), the radius of curvature of the minimum refractive surface is as small as about half or less of the focal length, so that the lens processing becomes more difficult as the screen size becomes smaller. There is a problem that the manufacturing cost increases.
[0005]
[Object of the invention]
The present invention provides a photographing method suitable for a camera using a solid-state imaging device, which has a half angle of view of about 20 °, an aperture ratio of about 1: 2.0, is bright, has good aberration correction, can be processed easily, and is inexpensive. The purpose is to obtain a lens system. In particular, it is an object of the present invention to obtain a photographic lens system in which lens processing is easy even when the radius of curvature of each lens is relatively large and the screen size is small.
[0006]
Summary of the Invention
The imaging lens system of the present invention includes, in order from the object side, a biconvex first lens, a biconcave second lens having a strong concave surface facing the object side, and a positive third lens having a strong convex surface facing the image side. And a fourth lens having a strong convex surface facing the object side, and a fourth lens having a shaping factor satisfying the following conditional expression (1), and a ratio of a radius of curvature of both surfaces of the second lens. Are characterized by satisfying the following conditional expression (2) .
(1) 0.5527 ≦ (r 8 + r 7 ) / (r 8 −r 7 ) ≦ 0.9021
(2) 0.4 <| r 3 / r 4 | <1.2
However,
r 7 : Radius of curvature of the object-side surface of the fourth lens
r 8 : Radius of curvature of the image-side surface of the fourth lens,
r 3 : Radius of curvature of the object-side surface of the second lens,
r 4 : Radius of curvature of the image-side surface of the second lens,
It is.
[0008]
In the taking lens system of the present invention, it is preferable that the sum of the powers of the surfaces of the second lens and the third lens facing each other satisfies the conditional expression (3) .
(3) -1.1 <φ r4 + φ r5 <-0.1
However,
φ r4 : surface power of the image-side surface of the second lens,
φ r5 : surface power of the object-side surface of the third lens,
It is.
[0009]
Further, from the surface r 2 of the image side of the first lens, the axial dimension of up to surface r 7 of the image side of the fourth lens may satisfy conditional expression (4).
(4) 1.1 <Σd i < 1.7 (i = 2~7)
However,
d i : axial distance between the i-th surface and the (i + 1) -th surface counted from the object side,
It is.
[0010]
The stop is disposed between the first lens and the second lens.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The taking lens system of the present invention includes, in order from the object side, a biconvex first lens, a biconcave second lens having a strong concave surface facing the object side, and a positive third lens having a strong convex surface facing the image side. And a fourth single lens with a strong convex surface facing the object side, making the radius of curvature of each lens relatively large, making lens processing simple and inexpensive even when the screen size is small. The present invention provides a photographic lens system that is bright and has a good aberration correction with an aperture ratio of about 1: 2.0, and is suitable for a camera using a fixed imaging device.
[0012]
Conditional expression (1) relates to the shaping factor of the fourth lens closest to the image, and is a condition necessary for telecentricity of about 5 ° or less. If the lower limit of conditional expression (1) is exceeded, the telecentric angle (the angle of incidence of the off-axis chief ray incident on the image plane) becomes too negative (inclined inward). If the upper limit is exceeded, the telecentric angle becomes 5 ° or more, and the object of the present invention cannot be achieved.
[0013]
Conditional expression (2) is a condition for favorably correcting spherical aberration and coma in the range of the ratio of the radii of curvature of both surfaces of the second lens which is the only negative lens in the entire lens system. Or the object-side radius of curvature of the refractive surface r 3 of the second lens becomes small, or exceeds a curvature lower limit of the radius is increased condition of the refractive surface r 4 of the image side can correct the excessive spherical aberration Disappears, and large inward frames occur. Conversely, if r 3 is increased or r 4 is decreased and exceeds the upper limit of the conditional expression, spherical aberration will be insufficiently corrected, and outward coma will occur, so that good imaging performance cannot be obtained.
[0014]
Conditional expression (3) represents the range of the sum of the powers of the surfaces of the air lens formed between the opposing surfaces of the second lens and the third lens, and suppresses the occurrence of coma flare and balances the image plane. Condition. When the negative power exceeds the lower limit and the negative power is increased, the coma flare due to the lower ray is largely generated on the outside, and the field curvature is excessively corrected. When the negative power is weaker than the upper limit, the coma flare due to the lower light beam is largely generated inside and the field curvature is insufficiently corrected, so that the imaging performance cannot be maintained.
[0015]
Conditional expression (4) defines the range of the distance between the first lens and the second lens where the aperture stop is arranged and the total range of the on-axis dimensions from the second lens to the fourth lens. This is a necessary condition for the light to be incident on the imaging plane (imaging plane) at about 5 ° or less. Therefore, if the on-axis dimension becomes shorter than the lower limit of conditional expression (4), the angle of incidence of the off-axis chief ray incident on the imaging plane cannot be suppressed to about 5 ° or less, and at the same time, the third lens and the fourth Since the edge thickness of the lens is reduced, it becomes difficult to process and assemble the lens particularly when the screen size is small. If the axial dimension becomes longer than the upper limit, the back focus becomes short, and it becomes difficult to arrange optical members such as a low-pass filter and an infrared cut filter.
[0016]
Hereinafter, the present invention will be described with reference to specific numerical examples. In each of the following Examples 1 to 4 , in order from the object side, a biconvex
[0017]
[Example 1]
FIGS. 1 and 2 show a first embodiment of a taking lens system according to the present invention. FIG. 1 is a diagram showing the lens configuration, and FIG. 2 is a diagram showing various aberrations.
Table 1 shows specific numerical data of this lens system. In the various aberration diagrams, SA indicates spherical aberration, SC indicates sine condition, chromatic aberration indicated by spherical aberration at each wavelength of d-line, g-line, and C-line, S indicates sagittal, and M indicates meridional.
[0018]
In the table and drawings, F NO is the F-number, F is the focal length, W is the half angle of view, f B is the back focus. R designates the radius of curvature, D is the lens thickness or distance between lens, N d is the refractive index of the d line, [nu is the Abbe number at the d-line. Back focus f B is the image side (imaging surface, r 11) of the cover glass CG fourth lens last surface (8 surface r) is an air conversion distance of the distance to (f B = d 8 + ( d 9 / N 9 ) + (d 10 / N 10 )).
[0019]
[Table 1]
[Example 2]
3 and 4 show a second embodiment of the taking lens system according to the present invention. FIG. 3 shows a lens configuration, FIG. 4 shows various aberration diagrams, and Table 2 shows specific numerical data.
[0021]
[Table 2]
[Example 3 ]
5 and 6 show a third embodiment of the taking lens system according to the present invention . FIG. 5 is a lens configuration diagram, FIG. 6 is a diagram of various aberrations, and Table 3 is specific numerical data.
[0027]
[ Table 3 ]
[ Example 4 ]
7 and 8 show a fourth embodiment of the taking lens system according to the present invention . FIG. 7 shows a lens configuration, FIG. 8 shows various aberration diagrams, and Table 4 shows specific numerical data.
[0029]
[ Table 4 ]
Next, Table 5 shows values for the respective conditional expressions in Examples 1 to 4 .
[ Table 5 ]
Table 5 reveals that numerical values of Examples 1 to 4 are pleased to conditional expression (1) through (4). Further, as is clear from the aberration diagrams, each aberration is also well corrected.
[0032]
【The invention's effect】
According to the present invention, it is suitable for a camera using a solid-state imaging device, which has a half angle of view of about 20 °, an aperture ratio of about 1: 2.0, is bright, has good aberration correction, is simple and inexpensive in lens processing. A photographic lens system.
[Brief description of the drawings]
FIG. 1 is a lens configuration diagram of a first embodiment of a taking lens system according to the present invention.
FIG. 2 is a diagram illustrating various aberrations of the lens system in FIG. 1;
FIG. 3 is a lens configuration diagram of a second embodiment of the taking lens system according to the present invention.
FIG. 4 is a diagram illustrating various aberrations of the lens system in FIG. 3;
FIG. 5 is a lens configuration diagram of a third embodiment of the taking lens system according to the present invention.
FIG. 6 is a diagram illustrating various aberrations of the lens system in FIG. 5;
FIG. 7 is a lens configuration diagram of a fourth embodiment of the taking lens system according to the present invention.
FIG. 8 is a diagram illustrating various aberrations of the lens system in FIG. 7;
Claims (4)
第４レンズのシェイピングファクターが下記条件式（１）を満足し、
第２レンズの両面の曲率半径の比が、下記条件式（２）を満足することを特徴とする撮影レンズ系。
（１）０．５５２７≦（ｒ8 ＋ｒ7 ）／（ｒ8 -ｒ7 ）≦０．９０２１
（２）０．４＜｜ｒ3 ／ｒ4 ｜＜１．２
但し、
ｒ 7 ：第４レンズの物体側の面の曲率半径、
ｒ 8 ：第４レンズの像側の面の曲率半径、
ｒ 3 ：第２レンズの物体側の面の曲率半径、
ｒ 4 ：第２レンズの像側の面の曲率半径。 In order from the object side, a biconvex first lens, a biconcave second lens with a strong concave surface facing the object side, a positive third lens with a strong convex surface facing the image side, and a strong convex surface with the object side Consisting of four single lenses with a fourth lens aimed at,
The shaping factor of the fourth lens satisfies the following conditional expression (1),
An imaging lens system , wherein the ratio of the radius of curvature of both surfaces of the second lens satisfies the following conditional expression (2) .
(1) 0.5527 ≦ (r 8 + r 7 ) / (r 8 −r 7 ) ≦ 0.9021
(2) 0.4 <| r 3 / r 4 | <1.2
However,
r 7 : Radius of curvature of the object-side surface of the fourth lens
r 8 : Radius of curvature of the image-side surface of the fourth lens,
r 3 : Radius of curvature of the object-side surface of the second lens,
r 4 : Radius of curvature of the image-side surface of the second lens.
（３）-１．１＜φr4＋φr5＜-０．１
但し、
φr4：第２レンズの像側の面の面パワー、
φr5：第３レンズの物体側の面の面パワー。 2. A photographing lens system according to claim 1 , wherein the sum of the powers of the surfaces of the second lens and the third lens facing each other satisfies the following conditional expression (3) .
(3) -1.1 <φ r4 + φ r5 <-0.1
However,
φ r4 : surface power of the image-side surface of the second lens,
φ r5 : surface power of the object-side surface of the third lens.
（４）１．１＜Σｄi ＜１．７ （ｉ＝２〜７）
但し、
ｄi ：物体側から数えて第ｉ面と第（ｉ＋１）面の軸上間隔。 According to claim 1 or 2, wherein the imaging lens system, the plane r 2 of the image side of the first lens, the axial dimension of up to surface r 7 of the image side of the fourth lens satisfies the following conditional expression (4) Shooting lens system.
(4) 1.1 <Σd i < 1.7 (i = 2~7)
However,
d i : axial distance between the i-th surface and the (i + 1) -th surface counted from the object side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06351696A JP3569379B2 (en) | 1996-03-19 | 1996-03-19 | Shooting lens system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06351696A JP3569379B2 (en) | 1996-03-19 | 1996-03-19 | Shooting lens system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09258100A JPH09258100A (en) | 1997-10-03 |
| JP3569379B2 true JP3569379B2 (en) | 2004-09-22 |
Family
ID=13231468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06351696A Expired - Fee Related JP3569379B2 (en) | 1996-03-19 | 1996-03-19 | Shooting lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3569379B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3714663B2 (en) | 2001-05-25 | 2005-11-09 | フジノン株式会社 | Single focus lens |
| US6950246B2 (en) | 2003-04-23 | 2005-09-27 | Olympus Corporation | Imaging optical system and apparatus using the same |
| JP4712318B2 (en) | 2003-06-11 | 2011-06-29 | オリンパス株式会社 | Imaging optical system and electronic apparatus using the same |
| JP4566614B2 (en) * | 2004-04-28 | 2010-10-20 | キヤノン株式会社 | Imaging lens and imaging apparatus having the same |
| JP4948232B2 (en) | 2007-03-30 | 2012-06-06 | 三洋電機株式会社 | Imaging lens unit and imaging apparatus provided with the same |
| JP6643201B2 (en) * | 2016-07-20 | 2020-02-12 | 富士フイルム株式会社 | Imaging lens and imaging device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6290610A (en) * | 1985-10-17 | 1987-04-25 | Fuji Photo Optical Co Ltd | Focal length conversion lens system with shared diaphragm |
| JPS63199312A (en) * | 1987-02-16 | 1988-08-17 | Olympus Optical Co Ltd | Compact lens system |
| JPH0795141B2 (en) * | 1987-11-13 | 1995-10-11 | キヤノン株式会社 | Front diaphragm type shooting lens |
| JP2706946B2 (en) * | 1988-06-07 | 1998-01-28 | 旭光学工業株式会社 | Front aperture projection lens |
| JP2578481B2 (en) * | 1988-08-05 | 1997-02-05 | アールデイエス株式会社 | Projection lens |
| JPH02310511A (en) * | 1989-05-26 | 1990-12-26 | Konica Corp | Photographic lens |
| JPH0540220A (en) * | 1991-08-07 | 1993-02-19 | Ricoh Co Ltd | Image formation lens for image pickup |
| JP3401317B2 (en) * | 1994-02-23 | 2003-04-28 | ペンタックス株式会社 | Loupe |
| JP3087581B2 (en) * | 1994-08-30 | 2000-09-11 | キヤノン株式会社 | Secondary imaging type zoom finder optical system |
| JPH09211330A (en) * | 1996-01-29 | 1997-08-15 | Canon Inc | Reflection optical system |
-
1996
- 1996-03-19 JP JP06351696A patent/JP3569379B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09258100A (en) | 1997-10-03 |
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