JPS61228409A - Optical device - Google Patents

Optical device

Info

Publication number
JPS61228409A
JPS61228409A JP6867585A JP6867585A JPS61228409A JP S61228409 A JPS61228409 A JP S61228409A JP 6867585 A JP6867585 A JP 6867585A JP 6867585 A JP6867585 A JP 6867585A JP S61228409 A JPS61228409 A JP S61228409A
Authority
JP
Japan
Prior art keywords
optical
surface plate
optical surface
fixed
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.)
Pending
Application number
JP6867585A
Other languages
Japanese (ja)
Inventor
Noboru Arai
登 荒井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP6867585A priority Critical patent/JPS61228409A/en
Publication of JPS61228409A publication Critical patent/JPS61228409A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mounting And Adjusting Of Optical Elements (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE:To position respective optical members on an optical surface plate accurately with extreme ease by forming groove parts in the optical surface plate in the same shapes with the bottom parts of the optical members. CONSTITUTION:The groove parts 1a almost in the same shapes with the bottom parts of the respective optical members are provided at positions where the respective optical members are provided. When a device is assembled, a laser light source 3 and a rotary polygon mirror 5 are fixed on holding bases 3A and 5A and then an incidence lens 4 and scanning lenses 6 and 7 are nearly fitted on the optical surface plate 1 by fitting only lens single bodies in the groove parts 1a. Thus, the groove parts 1a are provided to the optical surface plate 1 and the optical members are fitted in the groove parts 1a and thus positioned and nearly fixed, so the respective optical members are positioned on the optical surface plate with extreme ease.

Description

【発明の詳細な説明】 (発明の分野) 本発明は光学定盤上に、光源、レンズ、ミラー等の光学
素子を有する光学部材が固定されてなる各種走査装置、
光源@置等の光学装置に関するものであり、特に詳細に
は製造時の組立が容易であり、製造コストの低減を図る
ことのできる光学装置に関するものである。
Detailed Description of the Invention (Field of the Invention) The present invention relates to various scanning devices in which an optical member having optical elements such as a light source, a lens, and a mirror is fixed on an optical surface plate;
The present invention relates to an optical device such as a light source, and more particularly, it relates to an optical device that is easy to assemble during manufacturing and can reduce manufacturing costs.

(発明の技術的背景および先行技術) 従来より、光学定盤上に光源、レンズ、ミラー等の光学
素子が設けられてなる光学装置としては各種走査装置、
光源装置等が知られており、広く実用に供されている。
(Technical Background and Prior Art of the Invention) Conventionally, various types of optical devices including optical elements such as light sources, lenses, and mirrors are provided on an optical surface plate include various scanning devices,
Light source devices and the like are known and are widely put into practical use.

これらの光学装置においては、光源、レンズ、ミラー等
の光学素子はそれぞれ保持台により支持され、保持台を
備えた光学部材として、保持台を介して光学定盤上に取
り付けられている。これらの光学装置は、その製造に当
たっては、各光学素子、保持台および光学定盤がそれぞ
れ単独に作られた後、一体に組み立てられるのが一般的
である。このため、精度の高い光学装置を得るためには
、各光学素子と保持台および各光学部材と光学定盤を固
着させる際に位置決めを正確に行なう必要がある。特に
光偏向器、走査レンズ、入射レンズ等の多数の光学素子
を備えてなり、それぞれの光学素子が光学定盤上の所定
の位置に、正確に固定される必要のある各種走査装置等
においては、上記位置決めは重要な問題となる。しかし
ながら各光学素子を保持台上に正しく固着させた後、こ
の光学素子と保持台とからなる光学部材を光学定盤の所
定の位置に1つずつ正しく固定していくのは多くの時間
、手間を要する作業であり、光学装置の組立作業の能率
を低下させる原因となるという問題が生じている。
In these optical devices, optical elements such as a light source, a lens, and a mirror are each supported by a holder, and are mounted on an optical surface plate via the holder as an optical member provided with the holder. When manufacturing these optical devices, it is common that each optical element, holder, and optical surface plate are individually manufactured and then assembled together. Therefore, in order to obtain a highly accurate optical device, it is necessary to accurately position each optical element and the holding stand and each optical member and the optical surface plate when fixing them together. In particular, various types of scanning devices are equipped with a large number of optical elements such as optical deflectors, scanning lenses, and incident lenses, and each optical element must be accurately fixed at a predetermined position on an optical surface plate. , the above positioning becomes an important issue. However, it takes a lot of time and effort to correctly fix each optical element on the holding table and then correctly fix the optical members made up of the optical element and the holding table at predetermined positions on the optical surface plate one by one. This is a task that requires a lot of time, and this poses a problem in that it causes a decrease in the efficiency of the assembly work of the optical device.

(発明の目的) 本発明は上記のような問題点に鑑みてなされたものであ
り、光学素子を有してなる光学部材の、光学定盤上にお
ける正確な位置決めを容易に行なうことを可能とし、組
立作業能率を向上させ、製造コストを低下させることの
できる光学装置を提供することを目的とするものである
(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and makes it possible to easily accurately position an optical member having an optical element on an optical surface plate. The object of the present invention is to provide an optical device that can improve assembly work efficiency and reduce manufacturing costs.

(発明の構成) 本発明の光学装置は、光源、レンズ、ミラー等の光学素
子を有する光学部材が光学定盤上に固定されてなる光学
装置において、前記光学定盤が前記光学部材の底部とほ
ぼ同一形状の溝部を備え、光学部材が該溝部に嵌入せし
められて光学定盤上に固定されることを特徴とするもの
である。
(Structure of the Invention) The optical device of the present invention is an optical device in which an optical member having optical elements such as a light source, a lens, and a mirror is fixed on an optical surface plate, wherein the optical surface plate is connected to a bottom of the optical member. It is characterized in that it includes grooves having substantially the same shape, and the optical member is fitted into the grooves and fixed on the optical surface plate.

すなわち、本発明は、光学定盤上の、光学部材が取り付
けられるべき所定の位置に、予め溝部を設け、−この溝
部に各光学部材を嵌入せしめることにより、光学部材の
位置決めおよび固定を極めて容易に行なうことを可能に
するものである。なお、ここで溝部に嵌入せしめられて
固定されるとは、溝部に嵌入せしめられることのみによ
り強固に固定される他に、溝部に嵌入せしめられて略固
定され、その後に、接着剤や板バネ等により強固に固定
されることをも意味するものとする。また本発明におい
て光学部材とは、少なくとも光学素子を有しているもの
であればよく、光学素子のみからなるものであってもよ
い。すなわち、本発明において各光学部材は、光学定盤
に設けられた溝部に嵌入されることにより光学定盤上に
固定されることから、光学素子はその種類によっては保
持台を介さずに溝部に直接嵌入せしめられることも可能
となる。
That is, the present invention provides grooves in advance at predetermined positions on the optical surface plate where optical members are to be attached, and by fitting each optical member into the grooves, positioning and fixing of the optical members is extremely easy. It allows you to do the following: Note that "fixed by being fitted into a groove" here means not only being firmly fixed by being fitted into a groove, but also being substantially fixed by being fitted into a groove, and then applied with an adhesive or a plate spring. It also means to be firmly fixed by etc. Further, in the present invention, the optical member may be any member having at least an optical element, and may be one consisting only of an optical element. That is, in the present invention, each optical member is fixed on the optical surface plate by being fitted into a groove provided in the optical surface plate, so depending on the type of optical element, the optical element may be inserted into the groove without using a holder. Direct insertion is also possible.

(実ays様) 以下、図面を参照して本発明の実施態様について説明す
る。
(Mr. Ays) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

第1図は本発明の光学装置の一実施態様であるレーザ走
査光学装置を示す斜視図である。
FIG. 1 is a perspective view showing a laser scanning optical device which is an embodiment of the optical device of the present invention.

光学室1111上には、光ビーム2を発するレーザ光源
3が保持台3Aを介して設けられている。光ビーム2の
光路上には入射レンズ4が設けられており、この入射レ
ンズ4により光ビーム2は、入射レンズ4通過後の光路
上に設けられ、保持台5Aにより光学室91A1上に固
定された回転多面15に、所定のビーム径を有する光ビ
ームとなって入射せしめられる。
A laser light source 3 that emits a light beam 2 is provided above the optical chamber 1111 via a holding table 3A. An input lens 4 is provided on the optical path of the light beam 2, and the light beam 2 is placed on the optical path after passing through the input lens 4, and is fixed on the optical chamber 91A1 by the holding table 5A. A light beam having a predetermined beam diameter is made incident on the rotating polygon 15.

前記回転多面鏡5は図中矢印六方向に回転することによ
り、入射せしめられる光ビーム2を反射偏向するもので
あり、回転多面115に反射偏向された光ビーム2は2
つの走査レンズ6.7からなる走査レンズ系を通過後、
矢印C方向に回転する(副走査する)ドラム状の走査面
8上を矢印B方向に主走査する。
The rotating polygon mirror 5 reflects and deflects the incident light beam 2 by rotating in the six directions of arrows in the figure, and the light beam 2 reflected and deflected by the rotating polygon 115 is 2
After passing through a scanning lens system consisting of two scanning lenses 6.7,
Main scanning is performed in the direction of arrow B on a drum-shaped scanning surface 8 that rotates (sub-scans) in the direction of arrow C.

ところで、前記レーザ光源3と保持台3A、入射レンズ
4、回転多面鏡5と保持台5A、走査レンズ6および、
走査レンズ7はそれぞれ光源、レンズ、ミラー等の光学
素子を有してなる光学部材である。一方、前記光学定盤
1は一例として金属製の鋳物であり、第2図に示すよう
に、各光学部材が設けられる位置に、それぞれ各光学部
材の底部とほぼ同一形状の溝部1aが設けられている。
By the way, the laser light source 3 and the holding table 3A, the entrance lens 4, the rotating polygon mirror 5 and the holding table 5A, the scanning lens 6, and
The scanning lenses 7 are optical members each having optical elements such as a light source, a lens, and a mirror. On the other hand, the optical surface plate 1 is, for example, a metal casting, and as shown in FIG. 2, grooves 1a having approximately the same shape as the bottom of each optical member are provided at the positions where each optical member is provided. ing.

装置組立時において、前記レーザ光源3と回転多面鏡5
は、それぞれ保持台3A、5Aに固着された後に、また
前記入射レンズ4および走査レンズ6゜7はレンズ単体
のみがそれぞれ前記溝部1aに嵌入せしめられて光学定
盤1上に略固定される。また、この溝部と各光学部材の
接合部には、前記略固定がなされた後、接着剤が流し込
まれて、固着がより強固なものとされ、各光学部材の光
学定盤上における固定が完了する。なお溝部1aは貫通
孔であっても有底のものであってもよく、また固定を行
なう際には、接着剤を用いる代りに、第3図にレンズ7
の固定を例にとつで示すように、一端9aが光学定盤1
上に固定されてなる1対の板バネ9゜9により光学部材
を光学定盤において強固に固定させることもできる。
When assembling the device, the laser light source 3 and the rotating polygon mirror 5
are fixed to the holders 3A and 5A, respectively, and the incident lens 4 and the scanning lens 6.7 are substantially fixed on the optical surface plate 1 by fitting only the lenses alone into the grooves 1a. Furthermore, after the above-mentioned approximate fixation is achieved, adhesive is poured into the joint between this groove and each optical member to make the adhesion even stronger, completing the fixation of each optical member on the optical surface plate. do. Note that the groove 1a may be a through hole or a bottomed groove, and when fixing, instead of using adhesive, a lens 7 as shown in FIG.
For example, as shown in Toto, one end 9a is attached to the optical surface plate 1.
The optical member can also be firmly fixed on the optical surface plate by a pair of leaf springs 9°9 fixed on the top.

このように光学定盤1に溝部1aを設け、この溝部1a
に光学部材を嵌入せしめて位置決めおよび略固定を行<
賃うようにしたことにより、光学定盤上における各光学
部材の正確な位置決めを極めて容易に行なうことができ
るようになる。また、光学定盤の?11部1aの位置を
一旦正確に設定してしまえば、同じ構造の光学定盤を大
量に作成し、この光学定盤の溝部に各光学部材を嵌入せ
しめることによって、光学部材が正確に位ば決めされて
なる光学装置を極めて容易に多数製造することができる
In this way, the groove portion 1a is provided in the optical surface plate 1, and the groove portion 1a is
Insert the optical member into the position and approximately fix the position.
By doing so, it becomes possible to extremely easily accurately position each optical member on the optical surface plate. Also, what about the optical surface plate? Once the position of the 11 part 1a is set accurately, it is possible to make a large number of optical surface plates with the same structure and fit each optical member into the grooves of the optical surface plates to ensure that the optical members are positioned accurately. It is possible to manufacture a large number of optical devices having a certain shape very easily.

さらに、上述した実施態様においては、従来の装置にお
いて保持台を介して光学定盤に取り付けられていた入射
レンズ4、走査レンズ6.7を、保持台を用いずに直接
前記溝部1aに嵌入せしめることができるので、部品点
数、製造工程共に減少させることが可能となり、特に大
きな効果をあげることができる。なお、前記光学定盤の
材質は上述のような金属に限られるものではなく、プラ
スチック等を用いてもよい。光学定盤をプラスチックに
より形成した場合には、各光学部材を溝部に圧入して、
接着剤や板バネ等を用いずに光学定盤上に固定させるこ
とも可能である。
Furthermore, in the embodiment described above, the entrance lens 4 and the scanning lens 6.7, which were attached to the optical surface plate via a holder in the conventional apparatus, are directly fitted into the groove 1a without using a holder. Therefore, it is possible to reduce both the number of parts and the manufacturing process, which is particularly effective. Note that the material of the optical surface plate is not limited to metal as described above, but may also be made of plastic or the like. If the optical surface plate is made of plastic, each optical member is press-fitted into the groove.
It is also possible to fix it on an optical surface plate without using adhesives, leaf springs, or the like.

次に第4図および第5図を参照して本発明の他の実施態
様であるマルチ光源光学装置について説明する。
Next, a multi-light source optical device, which is another embodiment of the present invention, will be described with reference to FIGS. 4 and 5.

光学定盤10上には、1例として3つの半導体レーザ1
1.12.13が互いに光ビーム射出軸を平行に揃えて
配置されており、これらの半導体レーザ11゜12、1
3はそれぞれ保持台11A、 12A、 13Aを介し
て光学室M10上に固定されている。また、これらの半
導体レーザ11.12.13に対向する位置にはコリメ
ータレンズ?4.15.16が設けられており、これら
のコリメータレンズ14.15.16も保持台14A。
For example, three semiconductor lasers 1 are mounted on the optical surface plate 10.
1, 12, and 13 are arranged with their light beam emission axes parallel to each other, and these semiconductor lasers 11°12, 1
3 are fixed on the optical chamber M10 via holding stands 11A, 12A, and 13A, respectively. Also, a collimator lens is placed at a position facing these semiconductor lasers 11, 12, and 13. 4,15,16 are provided, and these collimator lenses 14,15,16 are also the holding base 14A.

15A、 16Aを介して前記光学定盤1110上に固
定されている。半導体レーザ11.12.、13から発
せられた光ビームlla 、 12a 、 13aはそ
れぞれコリメータレンズ14. Is、 isを通過し
て平行ビームとなって射出される。これらの光ビームは
、必要に応じて装置内もしくは装置外に設けられたミラ
ー、レンズ等の光学素子により、所定の位置において所
定のビーム径を有する1本の光ビームに合成されて使用
される。
It is fixed on the optical surface plate 1110 via 15A and 16A. Semiconductor laser 11.12. The light beams lla, 12a, 13a emitted from collimator lenses 14., 13, respectively. It passes through Is and is and is emitted as a parallel beam. These light beams are combined into a single light beam with a predetermined beam diameter at a predetermined position by optical elements such as mirrors and lenses installed inside or outside the device as necessary. .

本実施態様の装置においては、前記光学室m1゜上の、
前記保持台11A、 12A、 13A、 14A、 
15A。
In the apparatus of this embodiment, above the optical chamber m1°,
The holding bases 11A, 12A, 13A, 14A,
15A.

16Aが取り付けられる位置に、各保持台の底部とほぼ
同一形状の溝部10aが設けられており、前記各半導体
レーザおよびコリメータレンズはそれぞれ保持台に固着
された後、保持台が前記溝部10aに嵌入せしめられる
ことにより、光学定盤上の所定の位置に固定される。従
って、保持台と半導体レーザおよび保持台とコリメータ
レンズからなる各光学部材は極めて容易に所定の位置に
正確に位置決めされることができる。このように、本実
施態様においては、複数の光ビームの高精度な合成を行
なうために、各々正確な位置決めが必要とされる複数の
半導体レーザおよびコリメータレンズを備えてなるマル
チ光源光学装置において組立作業能率を大きく向上させ
ることが可能となる。
A groove 10a having almost the same shape as the bottom of each holder is provided at the position where the holder 16A is attached, and after each semiconductor laser and collimator lens are fixed to the holder, the holder is fitted into the groove 10a. As a result, it is fixed at a predetermined position on the optical surface plate. Therefore, each optical member consisting of the holder, the semiconductor laser, and the holder and the collimator lens can be extremely easily and accurately positioned at a predetermined position. As described above, in this embodiment, in order to perform highly accurate synthesis of a plurality of light beams, the assembly is performed in a multi-light source optical device comprising a plurality of semiconductor lasers and collimator lenses, each of which requires accurate positioning. It becomes possible to greatly improve work efficiency.

なお、本発明の光学装置は上述した走査光学装置や光源
光学装置に限られるものではなく、光学定盤上に光学部
材が固定されてなるものであれば、種々の構成の装置に
ついて実現可能であり、いずれの光学Vtaにおいても
生産性の向上、コストの低減等の効果を達成することが
できる。
Note that the optical device of the present invention is not limited to the above-mentioned scanning optical device or light source optical device, but can be realized in devices with various configurations as long as the optical member is fixed on an optical surface plate. Therefore, any optical Vta can achieve effects such as improved productivity and reduced costs.

(発明の効果) 以上説明したように、本発明の光学装置によれば、光学
定盤上に、各光学部材の底部とほぼ同一形状の溝部を設
けたことにより、各光学部材の光学定盤上における正確
な位置決めを極めて容易に行なうことができ、生産性が
大きく向上し、製造コストの低減も図ることが可能とな
る。また、レンズ、ミラー等の光学素子は、必ずしも保
持台により支持される必要がなくなり、前記溝部に直接
嵌入せしめられて固定されることも可能となることから
、多数のレンズ等を備えてなる走査光源装置等において
は、部品点数を減少させることもでき、特に大きな効果
をあげることができる。
(Effects of the Invention) As explained above, according to the optical device of the present invention, the optical surface plate of each optical member is provided with a groove having substantially the same shape as the bottom of each optical member on the optical surface plate. Accurate positioning on the top can be performed extremely easily, productivity can be greatly improved, and manufacturing costs can also be reduced. In addition, optical elements such as lenses and mirrors do not necessarily need to be supported by a holding table, and can be directly fitted into the groove and fixed, so that optical elements such as lenses and mirrors can be used for scanning devices equipped with a large number of lenses, etc. In a light source device or the like, the number of parts can be reduced, and a particularly great effect can be achieved.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施態様であるレーザ走査光学装置
を示す斜視図、 第2図は上記実施態様における光学定盤を示す斜視図、 第3図は板バネによるレンズの固定を説明するための概
略図、 第4図は本発明の他の実施態様であるマルチ光源光学装
置を示す斜視図、 第5図は上記実施態様における光学定盤を示す斜視図で
ある。 1.10・・・光学定盤  1a、 10a・・・・・
・溝   部4・・・・・・・・・入射レンズ 5・・
・・・・・・・・・・・・・回転多面鏡6.7・・・走
査レンズ 11.12.13・・・半導体レーザ14、
15.16・・・コリメータレンズ3A、5A、11A
、12A。 13△、 14A、 15A、 16A・・・保 持 
台第5図
Fig. 1 is a perspective view showing a laser scanning optical device which is an embodiment of the present invention, Fig. 2 is a perspective view showing an optical surface plate in the above embodiment, and Fig. 3 explains fixing of a lens by a leaf spring. FIG. 4 is a perspective view showing a multi-light source optical device according to another embodiment of the present invention, and FIG. 5 is a perspective view showing an optical surface plate in the above embodiment. 1.10...Optical surface plate 1a, 10a...
・Groove portion 4...Incidence lens 5...
......Rotating polygon mirror 6.7...Scanning lens 11.12.13...Semiconductor laser 14,
15.16...Collimator lenses 3A, 5A, 11A
, 12A. 13△, 14A, 15A, 16A... hold
Figure 5

Claims (1)

【特許請求の範囲】[Claims] 光学素子を有する光学部材が光学定盤上に固定されてな
る光学装置において、前記光学定盤が前記光学部材の底
部とほぼ同一形状の溝部を備え、前記光学部材が、前記
溝部に嵌入せしめられて前記光学定盤上に固定されるこ
とを特徴とする光学装置。
In an optical device in which an optical member having an optical element is fixed on an optical surface plate, the optical surface plate is provided with a groove portion having substantially the same shape as the bottom of the optical member, and the optical member is fitted into the groove portion. An optical device, characterized in that the optical device is fixed on the optical surface plate.
JP6867585A 1985-04-01 1985-04-01 Optical device Pending JPS61228409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6867585A JPS61228409A (en) 1985-04-01 1985-04-01 Optical device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6867585A JPS61228409A (en) 1985-04-01 1985-04-01 Optical device

Publications (1)

Publication Number Publication Date
JPS61228409A true JPS61228409A (en) 1986-10-11

Family

ID=13380528

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6867585A Pending JPS61228409A (en) 1985-04-01 1985-04-01 Optical device

Country Status (1)

Country Link
JP (1) JPS61228409A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63261315A (en) * 1987-04-20 1988-10-28 Fuji Photo Film Co Ltd Optical unit
US4884856A (en) * 1987-04-03 1989-12-05 Asahi Kogaku Kogyo K.K. Polygonal mirror and method of making same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5670513A (en) * 1979-11-14 1981-06-12 Toshiba Corp Optical reader
JPS58153907A (en) * 1982-03-09 1983-09-13 Minolta Camera Co Ltd Lens for scanning
JPS5948175B2 (en) * 1980-04-07 1984-11-24 マツダ株式会社 Automotive door glass installation positioning tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5670513A (en) * 1979-11-14 1981-06-12 Toshiba Corp Optical reader
JPS5948175B2 (en) * 1980-04-07 1984-11-24 マツダ株式会社 Automotive door glass installation positioning tool
JPS58153907A (en) * 1982-03-09 1983-09-13 Minolta Camera Co Ltd Lens for scanning

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4884856A (en) * 1987-04-03 1989-12-05 Asahi Kogaku Kogyo K.K. Polygonal mirror and method of making same
JPS63261315A (en) * 1987-04-20 1988-10-28 Fuji Photo Film Co Ltd Optical unit

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