JPS63259512A - Camera having variable nd filter - Google Patents
Camera having variable nd filterInfo
- Publication number
- JPS63259512A JPS63259512A JP9489087A JP9489087A JPS63259512A JP S63259512 A JPS63259512 A JP S63259512A JP 9489087 A JP9489087 A JP 9489087A JP 9489087 A JP9489087 A JP 9489087A JP S63259512 A JPS63259512 A JP S63259512A
- Authority
- JP
- Japan
- Prior art keywords
- variable
- filter
- camera
- electric conduction
- shutter operation
- 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
Links
- 238000002834 transmittance Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 230000000704 physical effect Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract 2
- 238000004040 coloring Methods 0.000 abstract 1
- 230000003446 memory effect Effects 0.000 abstract 1
Landscapes
- Liquid Crystal (AREA)
Abstract
PURPOSE:To make the inside of a finder bright and easy to visible by extending a power supply period after having opened a power source switch or after having ended a shutter operation, executing an electric conduction of the reverse direction to a material optical element of a variable ND filter, and resetting it to a light transmission state. CONSTITUTION:When a camera is started, first of all, the incident light quantity is measured by a photosensor 20, and it is transferred to an automatic control circuit 12 of a variable ND filter 11. The automatic control circuit 12 calculates a proper value of a shutter speed, a diaphragm value, etc., executes an electric conduction to the variable ND filter 11 so as to correspond to said value, and sets it to a transmittivity attenuating state. That is, first electrochromic layers 3, 3' are colored in black, and after the electric conduction is cut off, the density is maintained by a memory action. After the shutter operation is ended, a current in the direction opposite to the time of coloring is brought to an electric conduction to the variable ND filter 11 from the automatic control circuit 12, and it is reset to a light transmission state. In such a way, it does not occur that the inside of a finder is dark and scarcely seen.
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、可変ＮＤフィルターを有するカメラ、更に詳
しくはエレクトロクロミック素子のように電気信号によ
りその透過率が変化する物性光学素子なＮＤフィルター
に用いたカメラに関するものである。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a camera having a variable ND filter, and more particularly to an ND filter that is a physical optical element whose transmittance changes depending on an electrical signal, such as an electrochromic element. This is related to the camera used.
［従来の技術］
従来のこの種のカメラに用いられるＮＤフィルターは、
各々固定濃度のフィルターを自分の所望で選び、その使
用目的が変わる毎に交換しなければならずカメラ使用時
の自由度に制限を与えるものであった。[Prior art] The ND filter used in conventional cameras of this type is
Each user had to select a filter with a fixed density according to his/her own wishes, and had to replace it each time the purpose of use changed, which limited the degree of freedom in using the camera.
Claims (3)
りなる可変ＮＤフィルターを有するカメラにおいて、シ
ャッター動作開始前に通電により前記可変ＮＤフィルタ
ーを透過光減衰状態にした後、前記可変ＮＤフィルター
への通電を遮断して、そしてシャッター動作終了後に前
記可変ＮＤフィルターに前記の発色時と逆方向の通電を
行って消色させ、光透過状態に復帰させることを特徴と
する可変ＮＤフィルターを有するカメラ。(1) In a camera that has a variable ND filter made of a physical material whose light transmittance is changed by an electric signal, after the variable ND filter is turned into a transmitted light attenuating state by energization before the start of shutter operation, the variable ND filter is A camera having a variable ND filter, characterized in that electricity is cut off, and after shutter operation is completed, the variable ND filter is energized in the opposite direction to the color development time to erase the color and return to a light transmitting state.
値とシャッタースピードによる制御範囲を越える場合、
通電により前記可変ＮＤフィルターを適切な透過光減衰
状態にするようにしたことを特徴とする特許請求の範囲
第１項記載の可変ＮＤフィルターを有するカメラ。(2) If the camera's photometric information before shutter operation exceeds the control range of aperture value and shutter speed,
2. A camera having a variable ND filter according to claim 1, wherein the variable ND filter is brought into an appropriate transmitted light attenuation state by energization.
ることを特徴とする特許請求の範囲第１項記載の可変Ｎ
Ｄフィルターを有するカメラ。(3) The variable N according to claim 1, wherein the physical property member is an electrochromic element.
A camera with a D filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9489087A JPS63259512A (en) | 1987-04-16 | 1987-04-16 | Camera having variable nd filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9489087A JPS63259512A (en) | 1987-04-16 | 1987-04-16 | Camera having variable nd filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63259512A true JPS63259512A (en) | 1988-10-26 |
Family
ID=14122637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9489087A Pending JPS63259512A (en) | 1987-04-16 | 1987-04-16 | Camera having variable nd filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63259512A (en) |
-
1987
- 1987-04-16 JP JP9489087A patent/JPS63259512A/en active Pending
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