JPH02287447A - Diaphragm device - Google Patents

Abstract

PURPOSE:To obtain a small-sized, lightweight and inexpensive diaphragm device of high durability and stability by providing a thin plate in which the outside of an opening diaphragm diameter is light-shielded, plural segments in which the inside of the opening diaphragm diameter is divided, and a voltage control device which brings the segments into a light-shielded condition while a voltage is applied and into a transparent condition while no voltage is applied. CONSTITUTION:The thin plate 11 in which the outside of the opening diaphragm diameter is light-shielded, the segments 12a-12c in which the inside of the opening diaphragm diameter is divided and the voltage control device 14 which brings the segments 12a-12c into the light-shielded condition while a voltage is applied and into the transparent condition while no voltage is applied are provided. Therefore, the control of passing light quantity is performed not in contact with the segments in mechanic by controlling on/off of a voltage applied to each segment. Thus, durability and stability are improved and the small-sized, lightweight and inexpensive diaphragm device is obtained.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はビデオ力、メラあるいはカメラ一体型ビデオテ
ープレコーダ（以下、カメラ一体型ＶＴＲと称す）およ
び電子スチルカメラにおける露光制御を行うために用い
る絞り装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an aperture device used for controlling exposure in a video camera, a camera-integrated video tape recorder (hereinafter referred to as a camera-integrated VTR), and an electronic still camera. It is related to.

従来の技術 近年、ビデオテープレコーダ（以下ＶＴＲと称す）の普
及が目ざましく、またビデオカメラあるいはカメラ一体
型ＶＴＲのフルオート化および低価格化、さらに民生用
電子スチルカメラの普及開始により、カメラ撮りを楽し
む機会も増加している。カメラ操りを行う場合、簡単薙
実に撮れると言う点から自動露出（以下、ＡＦと称す）
機構が不可欠な要素になりつつある。ＡＦ機構を正確に
動作させるためには通過光量を精度良（制御しなければ
ならず、そのために絞り装置が必要である。以下図面を
参照しながら従来の絞り装置の一例について説明する。2. Description of the Related Art In recent years, video tape recorders (hereinafter referred to as VTRs) have become rapidly popular, and video cameras and camera-integrated VTRs have become fully automatic and have become cheaper, and consumer electronic still cameras have become more widespread. Opportunities to enjoy it are also increasing. When operating the camera, automatic exposure (hereinafter referred to as AF) is used because it allows you to take pictures easily.
Mechanisms are becoming an essential element. In order to operate the AF mechanism accurately, the amount of passing light must be precisely controlled, and for this purpose a diaphragm device is required.An example of a conventional diaphragm device will be described below with reference to the drawings.

第４図は従来の絞り装置の構成を示す断面図である。ま
た第５図は第４図の断面図である。第４図、第５図にお
いて、絞り羽根１，２は本体３とカバー（図示せず）と
の間に摺動可能に挿入されている。４は絞り装置の開口
面積を制御するための絞りメータであり、ガルバノメー
タ等で構成されている。絞りメータ４の回転軸５にはレ
バー６が結合されており、回転軸５とともに回動する。FIG. 4 is a sectional view showing the configuration of a conventional diaphragm device. Further, FIG. 5 is a sectional view of FIG. 4. In FIGS. 4 and 5, the aperture blades 1 and 2 are slidably inserted between the main body 3 and a cover (not shown). Reference numeral 4 denotes an aperture meter for controlling the aperture area of the aperture device, and is composed of a galvanometer or the like. A lever 6 is coupled to the rotating shaft 5 of the aperture meter 4 and rotates together with the rotating shaft 5.

レバー６の両端に植設されたビン７ａ、７ｂは絞り羽根
１，２の各々端部に設けられた長穴８ａ。The bins 7a and 7b installed at both ends of the lever 6 are elongated holes 8a provided at the ends of the aperture blades 1 and 2, respectively.

８ｂに係合され絞りメータ４を駆動制御することにより
、絞り羽根１．２を各々逆方向にスライドさせ、入射光
量に応じて開口部９の面積を変えることができるよう構
成されている。By engaging with the aperture meter 8b and controlling the drive of the aperture meter 4, the aperture blades 1.2 are slid in opposite directions, and the area of the aperture 9 can be changed in accordance with the amount of incident light.

発明が解決しようとする課題 しかしながら上記のような構成では、絞りメータ４は空
間を大きく占める。また部品点数も多く精度も要求され
、組立工数もかかるのでコストアップになる。したがっ
て最近のビデオカメラあるいはカメラ一体型ＶＴＲの小
型軽量化、低コスト化等のさまたげとなる。また、絞り
羽根ｌおよび絞り羽根２は絞り本体３とカバーとのあい
だで常に摺動しているため耐久性、安定性などの点で非
常に問題がある。この耐久性、安定性といった要素は、
長時間連続使用することの多いビデオカメラやカメラ一
体型ＶＴＲにとって非常に重要である。Problems to be Solved by the Invention However, in the above configuration, the aperture meter 4 occupies a large amount of space. In addition, the number of parts is large, precision is required, and assembly man-hours are required, which increases costs. This hinders efforts to make recent video cameras or camera-integrated VTRs smaller, lighter, and lower in cost. Further, since the aperture blades 1 and 2 are constantly sliding between the aperture main body 3 and the cover, there are serious problems in terms of durability and stability. Elements such as durability and stability are
This is extremely important for video cameras and camera-integrated VTRs that are often used continuously for long periods of time.

本発明は上記課題を解消するもので、小型軽量かつ低コ
ストで耐久性、安定性の高い絞り装置を提供するもので
ある。The present invention solves the above problems and provides an aperture device that is small, lightweight, low cost, and highly durable and stable.

課題を解決するための手段 上記問題点を解決するために本発明の絞り装置は、開放
絞り径外は遮光された薄板と、前記薄板の開放絞り径内
を分割した複数のセグメントと、前記セグメントを電圧
印加時に遮光状態とし、電圧無印加時に透明状態とする
ための電圧制御手段という構成を有している。Means for Solving the Problems In order to solve the above-mentioned problems, the diaphragm device of the present invention includes a thin plate shielded from light outside the open aperture diameter, a plurality of segments obtained by dividing the thin plate inside the open aperture diameter, and the segments. It has a configuration of voltage control means for making it into a light shielding state when a voltage is applied and making it into a transparent state when no voltage is applied.

作用 この構成によって、通過光量の、ＩＱ御が、各セグメン
トに印加する電圧のオン−オフを制御することにより機
構的に非接触で行える。したがって、非常に耐久性、安
定性の高い通過光量制御が可能である。Function: With this configuration, IQ control of the amount of light passing through can be performed mechanically without contact by controlling on/off of the voltage applied to each segment. Therefore, it is possible to control the amount of passing light with extremely high durability and stability.

また、近年の液晶、半導体技術の進歩により、受光素子
および発光素子は非常に小さく、低コストである。一方
、電圧制御部は本体と一体に形成すれば良いので部品点
数も少なく、組立工数も少な（できるため、非常に小型
計量化かつ低コストで通過光量を制御することができる
。Further, due to recent advances in liquid crystal and semiconductor technology, light receiving elements and light emitting elements have become extremely small and low cost. On the other hand, since the voltage control section can be formed integrally with the main body, the number of parts and the number of assembly steps can be reduced (this makes it possible to control the amount of passing light with very small size and low cost).

実施例 以下、本発明の一実施例について１図面を参照しながら
説明する。EXAMPLE Hereinafter, an example of the present invention will be described with reference to one drawing.

第１図は本発明の一実施例における絞り装置の構成を示
す平面図、第２図は第１図の断面図、第３図は動作説明
のための平面図を示すものである。FIG. 1 is a plan view showing the configuration of a diaphragm device in an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a plan view for explaining the operation.

第１図において、本体１１の表面は黒色塗料等で遮光さ
れており、開放絞り径と最小絞り径との間が三つのセグ
メント１２ａ、１２ｂ、１２ｃに分割されている。最小
絞り径内１３は常に透明状態となっており光が透過でき
るようになっている。第２図に示すように、三つのセグ
メント１２ａ。In FIG. 1, the surface of the main body 11 is shaded with black paint or the like, and the area between the open aperture diameter and the minimum aperture diameter is divided into three segments 12a, 12b, and 12c. The inside of the minimum aperture diameter 13 is always in a transparent state so that light can pass therethrough. As shown in FIG. 2, three segments 12a.

１２ｂ、１２ｃはそれぞれ電圧が無印加の時は透明で光
の透過状態にあり、陽電極部１２’ａに定電圧を印加す
ると液晶Ｒ１２’ｂが再配列され、遮光状態となる。12b and 12c are transparent and transmit light when no voltage is applied, and when a constant voltage is applied to the positive electrode portion 12'a, the liquid crystals R12'b are rearranged and the liquid crystals R12'b are in a light-blocking state.

以上のように構成された本実施例の絞り装置の動作を説
明する。The operation of the aperture device of this embodiment configured as described above will be explained.

第３図において、三つのセグメント１２ａ。In FIG. 3, three segments 12a.

１２ｂ、１２ｃの全てが電圧無印加状態の時は（ａ）に
示すように、開放状態となる。When no voltage is applied to both 12b and 12c, they are in an open state as shown in (a).

次にセグメント１２ａだけが電圧印加状態の時（ｂ）に
示すように、セグメント１２ａだけが遮光状態となり、
−段小絞りとなる。Next, when only the segment 12a is in the voltage applied state, as shown in (b), only the segment 12a is in the light shielding state,
-The aperture becomes smaller.

さらに三つのセグメント１２ａ、１２ｂ、１２ｃの全て
が電圧印加状態の時（Ｃ）に示すように、三つのセグメ
ント１２ａ、１２ｂ、１２ｃの全てが遮光状態となり、
最小絞りとなる。Further, when all three segments 12a, 12b, 12c are in a voltage applied state, as shown in (C), all three segments 12a, 12b, 12c are in a light shielding state,
Minimum aperture.

以上のように本実施例によれば、開放絞り径外は遮光さ
れた薄板１１と、薄板１１の開放絞り径内を分割したセ
グメント１２　ａ　Ｔ　　１２　ｂ　＊　　１２　ｃと
、セグメント１２ａ、１２ｂ、１２ｃを電圧印加時に遮
光状態とし、電圧無印加時に透明状態とするための電圧
ｉｌｌ　ｔ１手段１４とを設けることにより、レンズの
位置検出が非接触で行え、耐久性。As described above, according to this embodiment, the thin plate 11 is shielded from light outside the open aperture diameter, the segments 12 a T 12 b * 12 c, which are divided into the thin plate 11 inside the open aperture diameter, and the segments 12 a, 12 b, and 12 c. By providing a voltage illumination means 14 for making the lens into a light shielding state when a voltage is applied and making it into a transparent state when no voltage is applied, the position of the lens can be detected without contact and is durable.

安定性を高めることができ、部品点数も少なく、組立性
も良く、小型計量化かつ低コスト化することができる。Stability can be improved, the number of parts is small, assembly is easy, and it is possible to reduce size, weight, and cost.

発明の効果 以上のように本発明によれば、開放絞り径内を分割した
複数のセグメントと、前記セグメントを電圧印加時に遮
光状態とし、電圧無印加時に透明状態とするための電圧
制御手段とを設けることにより、通過光量制御が非接触
で行え、耐久性、安定性を高めることができ、部品点数
も少なく、組立性も良く、小型計量化かつ低コスト化す
ることができるという優れた絞り装置を実現できるもの
である。Effects of the Invention As described above, according to the present invention, a plurality of segments are formed by dividing the inside of an open aperture diameter, and voltage control means is provided for making the segments into a light-shielding state when a voltage is applied and into a transparent state when no voltage is applied. This is an excellent diaphragm device that allows non-contact control of the amount of light passing through, increases durability and stability, has fewer parts, is easy to assemble, and can be made smaller and weighed at a lower cost. It is possible to realize this.

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

第１図は本発明の一実施例における絞り装置の構成を示
す構成を示す平面図、第２図は第１図の断面図、第３図
は動作説明のための平面図、第４図は従来の絞り装置の
平面図、第５図は第４図の断面図である。 １１・・・・・・本体、１２ａ、１２ｂ、１２ｃ・・・
・・・セグメント、１３・・・・・・最小絞り径、１４
・・・・・・電圧制御部。 代理人の氏名　弁理士　粟野重孝　はが１名の　　ヮ 滅FIG. 1 is a plan view showing the configuration of an aperture device according to an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, FIG. 3 is a plan view for explaining the operation, and FIG. A plan view of a conventional diaphragm device, and FIG. 5 is a sectional view of FIG. 4. 11...Main body, 12a, 12b, 12c...
...Segment, 13...Minimum aperture diameter, 14
...Voltage control section. Name of agent: Patent attorney Shigetaka Awano

Claims (3)

【特許請求の範囲】[Claims] （１）開放絞り径外は遮光された薄板と、前記薄板の開
放絞り径内を分割した複数のセグメントと、前記セグメ
ントを電圧印加時に遮光状態とし、電圧無印加時に透明
状態とするための電圧制御手段とを設けたことを特徴と
する絞り装置。(1) A thin plate that is shielded from light outside the open aperture diameter, a plurality of segments obtained by dividing the inside of the thin plate within the open aperture diameter, and a voltage that makes the segments light-shielded when a voltage is applied and transparent when no voltage is applied. A diaphragm device characterized in that it is provided with a control means. （２）セグメントは、同心円状に分割したことを特徴と
する特許請求の範囲第１項記載の絞り装置。(2) The aperture device according to claim 1, wherein the segments are divided concentrically. （３）遮光状態の最も中央側のセグメントに従属して、
外側のセグメントが遮光状態になることを特徴とする特
許請求の範囲第１項又は第２項記載の絞り装置。(3) Depending on the most central segment in the shaded state,
3. The aperture device according to claim 1, wherein the outer segment is in a light-shielding state.