JPS63269137A - Group lens - Google Patents

Group lens

Info

Publication number
JPS63269137A
JPS63269137A JP10321887A JP10321887A JPS63269137A JP S63269137 A JPS63269137 A JP S63269137A JP 10321887 A JP10321887 A JP 10321887A JP 10321887 A JP10321887 A JP 10321887A JP S63269137 A JPS63269137 A JP S63269137A
Authority
JP
Japan
Prior art keywords
lens
filter
holder
plastic lens
plastic
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
JP10321887A
Other languages
Japanese (ja)
Inventor
Yasuyuki Sugi
靖幸 杉
Hiroshi Otsu
浩 大津
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP10321887A priority Critical patent/JPS63269137A/en
Publication of JPS63269137A publication Critical patent/JPS63269137A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent a plastic lens from the generation of flaws or the adhesion of dirt by arranging a parallel plane filter with infrared cut coating on the front side of the plastic lens. CONSTITUTION:The plastic lens 4 is held by a lens holder 1 and clamped by a lens pressing ring 6 and a protection filter 3 is constituted of a parallel plane glass plate, held by a filter holder 2 and clamped by a filter pressing ring 5. The filter holder 2 is engaged and built with/in a filter fitting screw part 11 formed in the front of the lens holder 1 and the screw part 11 has a normal JIS screw shape. The protection filter 3 includes a coat having spectral transmission factor characteristics. Consequently, the plastic lens can be prevented from the generation of flaws or the adhesion of dirt and an image pickup part of a video camera can be prevented from the incidence of infrared rays without using an infrared ray cut filter arranged on the most rear side of the lens group.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ビデオカメラ用等の組レンズ、特に、固体撮
像素子形でズーム形のビデオカメラ用として好適な光学
系の組レンズに関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lens assembly for a video camera, etc., and particularly to a lens assembly with an optical system suitable for use in a zoom video camera with a solid-state image sensor. be.

〔従来の技術〕[Conventional technology]

従来から、ビデオカメラとしては小形軽量化の見地から
、固体撮像素子が用いられると共に、レンズ系について
も軽量なものが要求されるようになって来ている。特に
、被写体に最も近い側のレンズ(前方レンズ)をプラス
チックレンズで構成することは、カメラの前方部分の重
量を軽減してその操作性を向上する上で望ましいもので
ある。
2. Description of the Related Art Conventionally, solid-state imaging devices have been used in video cameras from the standpoint of reducing size and weight, and there has also been a demand for lightweight lens systems. In particular, it is desirable to configure the lens closest to the subject (front lens) with a plastic lens in order to reduce the weight of the front portion of the camera and improve its operability.

従来から、プラスチックレンズ自体はよく知られている
が、従前のガラスレンズと違って傷がつき易いため、例
えば実公昭61−4881号公報に示されるように、メ
ガネ用レンズに関しその表裏の面に耐擦傷性の無機質の
硬化保護膜を設けている。しかし、固体撮像系のビデオ
カメラでそのようなプラスチックレンズを用いたもの、
特に、被写体側に最も近い側にプラスチックレンズ玉を
用いたものは未だ実現するに至っていない。
Plastic lenses have long been well known, but unlike conventional glass lenses, they are easily scratched, so as shown in Japanese Utility Model Publication No. 61-4881, for example, plastic lenses have been used on the front and back surfaces of eyeglass lenses. A scratch-resistant inorganic hardened protective film is provided. However, solid-state imaging video cameras that use such plastic lenses,
In particular, a lens using a plastic lens on the side closest to the subject has not yet been realized.

一方、通常のガラスレンズ系を用いた固体撮像形のビデ
オカメラのレンズ系では、被写体から最も違い側すなわ
ちレンズ系最後端に赤外線カット用の水晶フィルタを設
けることが通例である。
On the other hand, in the lens system of a solid-state imaging type video camera using a normal glass lens system, a crystal filter for cutting infrared rays is usually provided on the side farthest from the subject, that is, at the rear end of the lens system.

(なお、レンズ系の光軸方向の中間に設けるのは設計上
困難であるから、やらない。)これは、固体撮像素子の
光センサが赤外線を感知し易いため像にもやのかかった
状態になるのを避けるためである。
(In addition, it is difficult to install it in the middle of the optical axis direction of the lens system, so it is not done.) This is because the optical sensor of the solid-state image sensor easily detects infrared rays, so the image is hazy. This is to avoid becoming

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上記した従来の固体撮像形のビデオカメラにおいて、プ
ラスチックレンズが用いられなかった理由の1つは、レ
ンズの材質の違いに基くものである。すなわち、上記実
公昭61−4881号公報でメガネ用として使われてい
るCR−39(ジエチレングリコールビスアリルカーボ
ネート)は、ビデオカメラのような高精度で耐久性を要
するものには不適で、ビデオカメラ用としてはアクリル
系樹脂等が望ましい、しかし、この種の材質のレンズで
は、無機質の硬化保護用または赤外線カット用の被膜に
対する接着性がきわめて低いため、これに直接硬化保護
用等の被膜を形成することはできない。
One of the reasons why plastic lenses have not been used in the conventional solid-state imaging type video cameras described above is based on the difference in the materials of the lenses. In other words, CR-39 (diethylene glycol bisallyl carbonate), which is used for eyeglasses in the above-mentioned Japanese Utility Model Publication No. 61-4881, is not suitable for products that require high precision and durability, such as video cameras. However, lenses made of this type of material have extremely low adhesion to inorganic hardened protective or infrared ray cutting films, so a hardened protective film must be formed directly on the lens. It is not possible.

かといって、保護用の被膜(保護層)なしのプラスチッ
ク玉レンズをそのままビデオカメラに用いたのでは、特
に、上述の軽量化操作性を考慮してレンズ系の最も前方
(被写体側)へ配置したのでは、プラスチックレンズ玉
に疵がつき又はごみよごれなどが付着するという問題が
生じる。
However, if a plastic ball lens without a protective coating (protective layer) was used as it is in a video camera, it would be difficult to place it at the very front (on the subject side) of the lens system, especially considering the above-mentioned weight reduction and operability. If this is done, the problem arises that the plastic lens ball may become scratched or have dirt and grime attached to it.

また、上述したように、赤外線カット用の高価な水晶フ
ィルタやガラスフィルタ(例えばガラス板の片面又は両
面に赤外線カット用被膜を施したもの)をレンズ系の最
も後側(被写体より遠い側)に配置するのを省略するこ
とができないため、コスト高を招く等の欠点がある。
Additionally, as mentioned above, an expensive crystal filter or glass filter (for example, a glass plate with an infrared-cutting coating on one or both sides) for cutting infrared rays should be placed at the rearmost side of the lens system (the side farthest from the subject). Since the arrangement cannot be omitted, there are drawbacks such as increased costs.

従って、本発明の目的は、上述の問題点を除き、保護コ
ーティングできないプラスチックレンズ玉をレンズ系の
最も前側に配置したときに、プラスチック玉レンズへの
疵や汚れが着くのを防止すると共に、レンズ群の最も後
側に通常設けられる赤外線カット用フィルタを省略する
ことのできる固体撮像ビデオカメラ等の組レンズを提供
することにある。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned problems, prevent scratches and dirt from being attached to a plastic lens when a plastic lens that cannot be coated with a protective coating is placed at the frontmost side of a lens system, and provide a lens. It is an object of the present invention to provide a lens assembly for a solid-state imaging video camera, etc., which can omit an infrared ray cut filter that is usually provided at the rearmost side of the group.

〔問題点を解決するための手段〕[Means for solving problems]

上記目的を達成するため、本発明の組レンズにおいては
、レンズ系の最も前側のプラスチックレンズ玉よりも更
に前側に、赤外線カットコーティングの施された平行平
面フィルタを配置することを特徴とする。
In order to achieve the above object, the lens assembly of the present invention is characterized in that a parallel plane filter coated with an infrared cut coating is disposed further in front of the frontmost plastic lens element of the lens system.

〔作用〕[Effect]

赤外線カットコーテイング付平行平面フィルタをプラス
チックレンズよりも更に前側に配置することにより、プ
ラスチックレンズが外気にさらされることなく、しかも
カメラの使用者が直接プラスチックに触れることが不可
能となるので、プラスチックレンズに、疵や汚れが付着
することを防止できる。また、赤外線カットフィルタが
一番前側に配置されているので、レンズ系の最も後側に
赤外線カットフィルタを設けないでも、従来の最も後側
に赤外線カットフィルタを設けたものと同様にビデオカ
メラ撮像部への赤外線の飛び込みを防止することができ
る。
By placing the parallel plane filter with an infrared cut coating further in front of the plastic lens, the plastic lens is not exposed to the outside air and it is impossible for the camera user to touch the plastic directly, so the plastic lens It can prevent scratches and dirt from adhering to the surface. In addition, since the infrared cut filter is placed at the frontmost side, even if the infrared cut filter is not installed at the rearmost side of the lens system, video camera imaging can still be performed in the same way as with conventional infrared cutoff filters installed at the rearmost side of the lens system. This can prevent infrared rays from entering the area.

〔実施例〕〔Example〕

以下、本発明の一実施例を第1図により説明する。第1
図は本発明の一実施例による固体撮像形でズーム形のビ
デオカメラ用の光学系における組レンズの先端部の一部
省略した断面図で、lはレンズホルダー、2はフィルタ
ホルダー、3は保護フィルタ、4はプラスチックレンズ
、5はフィルタ押え環、6はレンズ押え環、11はフィ
ルタ取付ネジである。プラスチックレンズ4はレンズホ
ルダー1に保持され、レンズ押え環6により止められて
いる。保護フィルタ3は平行平面ガラス板であり、フィ
ルタホルダー2に保持され、フィルタ押え環5により止
められている。フィルタホルダー2は、レンズホルダー
1の前部に切られているフィルタ取付ネジ部11に嵌合
されて組込まれる。なおフィルタ取付ネジ11は通常J
IS規格のネジ形状となっている。また3の保護フィル
タには第2図に示すような分光透過率特性をもつコーテ
ィングが施されているものとする0以上の本実施例によ
れば、プラスチックレンズへの疵、汚れが防止ができ、
またレンズ群の一番後側の赤外線カットフィルタなしに
ビデオカメラ撮像部へ赤外線が入らないようにすること
ができるという効果がある。
An embodiment of the present invention will be described below with reference to FIG. 1st
The figure is a partially omitted cross-sectional view of the tip of a lens assembly in an optical system for a solid-state imaging type zoom video camera according to an embodiment of the present invention, where l is a lens holder, 2 is a filter holder, and 3 is a protection 4 is a plastic lens, 5 is a filter holding ring, 6 is a lens holding ring, and 11 is a filter mounting screw. A plastic lens 4 is held by a lens holder 1 and is stopped by a lens holding ring 6. The protective filter 3 is a parallel plane glass plate, and is held by the filter holder 2 and stopped by a filter holding ring 5. The filter holder 2 is assembled into the lens holder 1 by being fitted into a filter mounting screw portion 11 cut in the front part. Note that the filter mounting screw 11 is usually J.
It has an IS standard screw shape. Furthermore, it is assumed that the protective filter 3 is coated with a coating having spectral transmittance characteristics as shown in FIG. ,
Furthermore, there is an effect that infrared rays can be prevented from entering the imaging section of the video camera without the use of an infrared cut filter at the rearmost side of the lens group.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明の組レンズは、しンズ系の
最も前側のプラスチックレンズ玉よりも更に前側に赤外
線カットコーティングの施された平行平面フィルタを配
置したので、該平行平面フィルタが、保護コーティング
なしのプラスチックレンズ玉に対する保護作用すなわち
最も前側に配置されたプラスチックレンズ玉への疵や汚
れの付着の防止作用をもつと共に、ビデオカメラ逼像部
への赤外線の飛び込みを防止する作用をもち、それによ
って装置全体の構成も小形化軽量化され、コストも低下
できる等、優れた効果を奏するものである。
As explained above, the lens assembly of the present invention has a parallel plane filter coated with an infrared cut coating further in front of the frontmost plastic lens element of the lens system. It has a protective effect on uncoated plastic lens balls, that is, it prevents scratches and dirt from adhering to the plastic lens ball placed at the frontmost side, and also has the effect of preventing infrared rays from entering the image area of the video camera. As a result, the overall structure of the device can be made smaller and lighter, and costs can be reduced, resulting in excellent effects.

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

第1図は本発明の一実施例の組レンズの先端部の断面図
、第2図は保護フィルタの分光透過率特性を示す図であ
る。 1・・・・・・レンズホルダー、2・・・・・・フィル
タホルダー、3・・・・・・保護フィルタ、4・・・・
・・プラスチックレンズ、5・・・・・・フィルタ押え
環、6・・・・・・レンズ押え第1図 第2図 :/rL憂(nm)
FIG. 1 is a sectional view of the tip of a lens assembly according to an embodiment of the present invention, and FIG. 2 is a diagram showing spectral transmittance characteristics of a protective filter. 1... Lens holder, 2... Filter holder, 3... Protective filter, 4...
...Plastic lens, 5...Filter retainer ring, 6...Lens retainer Figure 1 Figure 2: /rL(nm)

Claims (1)

【特許請求の範囲】[Claims] 1、前方被写体側のレンズ玉がプラスチック材料で構成
されたレンズ群の更に前側に、赤外線カットコーティン
グが施された平行平面ガラスフィルタを設け、該平行平
面ガラスフィルタにより前記レンズ玉を保護するように
構成した組レンズ。
1. A parallel plane glass filter coated with an infrared ray cut coating is provided further in front of the lens group in which the front subject side lens element is made of plastic material, and the lens element is protected by the parallel plane glass filter. The assembled lens.
JP10321887A 1987-04-28 1987-04-28 Group lens Pending JPS63269137A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10321887A JPS63269137A (en) 1987-04-28 1987-04-28 Group lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10321887A JPS63269137A (en) 1987-04-28 1987-04-28 Group lens

Publications (1)

Publication Number Publication Date
JPS63269137A true JPS63269137A (en) 1988-11-07

Family

ID=14348361

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10321887A Pending JPS63269137A (en) 1987-04-28 1987-04-28 Group lens

Country Status (1)

Country Link
JP (1) JPS63269137A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0616919U (en) * 1992-08-14 1994-03-04 リズム時計工業株式会社 Lens unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0616919U (en) * 1992-08-14 1994-03-04 リズム時計工業株式会社 Lens unit

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