JP2003140226A - Light quantity adjusting device and camera using the same - Google Patents
Light quantity adjusting device and camera using the sameInfo
- Publication number
- JP2003140226A JP2003140226A JP2001332572A JP2001332572A JP2003140226A JP 2003140226 A JP2003140226 A JP 2003140226A JP 2001332572 A JP2001332572 A JP 2001332572A JP 2001332572 A JP2001332572 A JP 2001332572A JP 2003140226 A JP2003140226 A JP 2003140226A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- light
- light quantity
- adjusting device
- quantity adjusting
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/02—Diaphragms
- G03B9/04—Single movable plate with two or more apertures of graded size, e.g. sliding plate or pivoting plate
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
- G02B26/023—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light comprising movable attenuating elements, e.g. neutral density filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/205—Neutral density filters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Lens Barrels (AREA)
- Diaphragms For Cameras (AREA)
- Blocking Light For Cameras (AREA)
- Studio Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、デジタルスチルカ
メラやビデオカメラ等に使用される光量調整装置に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light amount adjusting device used in a digital still camera, a video camera or the like.
【０００２】[0002]
【従来の技術】従来、デジタルスチルカメラやビデオカ
メラ等に使用される光量調整装置では、光量を調整する
ために光量調整羽根が光軸開口を進退するとともに、光
量調整羽根が小絞りの際におけるハンチングや光学上の
回折現象による解像力の低下等の難点を防止するため
に、光量調整用フィルター、例えばＮＤフィルター（Ｎ
ｅｕｔｒａｌ Ｄｅｎｓｉｔｙ Ｆｉｌｔｅｒ）が光軸
開口に進退するように配設されていることは周知であ
る。2. Description of the Related Art Conventionally, in a light quantity adjusting device used in a digital still camera, a video camera or the like, a light quantity adjusting blade moves forward and backward through an optical axis opening to adjust the light quantity, and when the light quantity adjusting blade has a small aperture. In order to prevent problems such as a decrease in resolution due to hunting and optical diffraction, a light amount adjusting filter, such as an ND filter (N
It is well known that an Euler Density Filter is arranged so as to move forward and backward with respect to the optical axis aperture.
【０００３】また、上記の光量調整羽根や光量調整用フ
ィルターはプラスチック材料で作られていることがほと
んどである。Most of the light quantity adjusting blades and the light quantity adjusting filters are made of a plastic material.
【０００４】光量調整羽根は通常ＰＥＴ（ポリエチレン
テレフタレート）またはＰＥＮ（ポリエチレンナフタレ
ート）等の材料を黒色に着色し、シート状に成形加工し
た後で表面につや消し塗装を施し、その後プレス加工等
で羽根形状にしている。The light quantity adjusting blade is usually made of a material such as PET (polyethylene terephthalate) or PEN (polyethylene naphthalate) colored black, formed into a sheet and then given a matte coating on the surface, and then pressed to form a blade. It has a shape.
【０００５】また、光量調整用フィルターは通常ＴＡＣ
（トリアセチルセルロース）材料に有機色素または顔料
を混入して光学的フィルター特性を持たせ、シート形状
に成形加工し、その後プレス加工にて必要なフィルター
形状にするものと、前記光量調整羽根と同一材料のＰＥ
ＴまたはＰＥＮを透明シート状に成形加工して後、蒸着
法にてその表面に無機質膜を形成させ、この無機質膜に
光学的フィルター特性を持たせるようにし、その後プレ
ス加工にて必要なフィルター形状にするものがある。The light amount adjusting filter is usually TAC.
(Triacetyl cellulose) Same as the above-mentioned light quantity adjusting blade, which mixes an organic dye or pigment into the material to give it optical filter characteristics, forms it into a sheet shape, and then presses it into the required filter shape. Material PE
After T or PEN is molded into a transparent sheet, an inorganic film is formed on the surface by a vapor deposition method so that the inorganic film has optical filter characteristics, and then the press process requires a filter shape. There is something to do.
【０００６】[0006]
【発明が解決しようとする課題】この時、次のような問
題が生じた。図１のレンズ光学系の断面図に示すよう
に、光量調整羽根Ｅ１、Ｅ２及び光量調整用フィルター
８９はそれぞれ近接した位置でレンズ鏡筒１００内のレ
ンズ１０１、１０２に挟まれるように配置されている。At this time, the following problems occurred. As shown in the cross-sectional view of the lens optical system in FIG. 1, the light amount adjusting blades E1 and E2 and the light amount adjusting filter 89 are arranged so as to be sandwiched between the lenses 101 and 102 in the lens barrel 100 at positions close to each other. There is.
【０００７】ほとんどのデジタルスチルカメラやビデオ
カメラでは、前玉レンズ１０３の開口径Ｇが光量調整装
置の光軸開口径Ｈより大きくなっており、面積で数倍程
度となっている。これは、ズームレンズ位置によっては
図１に示される光路のように、前玉レンズ１０３が受け
た光が光量調整装置の光軸開口部５２で数倍に集光され
ていることになり、また同時に光に含まれる熱線も同様
に集光されてしまうことになる。In most digital still cameras and video cameras, the opening diameter G of the front lens 103 is larger than the optical axis opening diameter H of the light quantity adjusting device, and is several times as large in area. This means that the light received by the front lens 103 is condensed several times at the optical axis opening 52 of the light quantity adjusting device, as in the optical path shown in FIG. 1, depending on the zoom lens position. At the same time, the heat rays included in the light are also collected.
【０００８】このために、晴天時の昼の太陽が画角に入
った時には、光量調整装置の光軸開口部では高温度にな
る。前玉径Ｇと光軸開口径Ｈとの比率でその温度は異な
り、幾種類かの前玉レンズでの試験では図２のように時
間経過とともに上昇して最高温度は８０℃から２１０℃
になった。For this reason, when the daytime sun on a clear day enters the angle of view, the temperature of the optical axis opening of the light quantity adjusting device becomes high. The temperature varies depending on the ratio of the front lens diameter G and the optical axis aperture diameter H, and in tests with several kinds of front lens, the temperature rises with time as shown in FIG. 2 and the maximum temperature rises from 80 ° C to 210 ° C.
Became.
【０００９】太陽が画角に入ると明るさがオーバーとな
るので、光量調整装置は光量を適度にするため光量調整
羽根及び光量調整用フィルターが光線の一部を遮光する
ように光軸開口内に進入してくる。そして、光量調整羽
根及び光量調整用フィルターは遮光する光線にさらされ
ることになり前記したように高温となる。Since the brightness becomes excessive when the sun enters the angle of view, the light amount adjusting device adjusts the light amount to an appropriate amount by setting the light amount adjusting blade and the light amount adjusting filter in the optical axis opening so as to block a part of the light beam. Come into. Then, the light amount adjusting blade and the light amount adjusting filter are exposed to the light rays that are shielded, and the temperature becomes high as described above.
【００１０】このとき、シート状の前記羽根及びフィル
ターは、そのプラスチック材質の特性によって熱収縮を
起こす。この収縮は光軸開口の光線受けている所で起こ
り、光線から外れている所では高温にならないので収縮
を起こさず、一部の収縮により図３に示すように羽根Ｅ
１及びフィルター８９は変形する。試験において従来品
では１００℃以上からこの収縮が顕著になり、光量調整
装置の不具合につながった。At this time, the sheet-shaped blade and the filter cause thermal contraction due to the characteristics of the plastic material. This contraction occurs where the ray of light in the aperture of the optical axis is received, and since it does not reach a high temperature where it deviates from the ray of light, the contraction does not occur.
1 and the filter 89 are deformed. In the test, in the conventional product, this shrinkage became remarkable from 100 ° C. or higher, which led to a malfunction of the light quantity adjusting device.
【００１１】光量調整装置の光量調整部１０４は図１に
示すようにレンズ鏡筒１００のレンズ１０２，１０３間
で挟まれるように配置されている為、光量調整部１０４
の厚みは極力薄くしてある。このときにシート状の羽根
及びフィルターが厚さ方向に変形すると、光量調整部前
後のレンズや光量調整装置の羽根及びフィルターの支持
部材やカバー部材に当たって動作不能となってしまう。Since the light quantity adjusting unit 104 of the light quantity adjusting device is arranged so as to be sandwiched between the lenses 102 and 103 of the lens barrel 100 as shown in FIG.
Is as thin as possible. At this time, if the sheet-shaped blades and the filter are deformed in the thickness direction, the lenses in front of and behind the light amount adjusting unit and the blades and filter supporting members and cover members of the light amount adjusting device become inoperable.
【００１２】またフィルターは前述で説明したように、
羽根のハンチングや回折現象を防止する為に、羽根より
も先に光軸開口内に臨み光軸中央を覆う必要があるた
め、羽根よりもより多く光線を受けるのでより変形をし
やすい。Further, the filter is, as described above,
In order to prevent the hunting and the diffraction phenomenon of the blade, it is necessary to face the inside of the optical axis opening and cover the center of the optical axis before the blade.
【００１３】また、フィルターの配置位置については、
光量調整装置の撮像素子（ＣＣＤ）側のレンズで反射し
た光がフィルター表面で再反射して撮像素子に入光し、
ゴースト現象の原因になる場合もあるため、撮像素子側
から見てフィルターの光学機能上で必要となる部分以外
を羽根で隠すように羽根の前玉側に設置されることが多
い。この場合では前玉側から入射する光線の、さらに多
くをフィルターで受けることになる。このとき羽根は多
くの面積がフィルターに覆われており、その部分はフィ
ルターを透過し減光した熱線の分を受けるだけで済む。
そのため羽根よりもフィルターの方がより高温になり、
より変形しやすくなる。Further, regarding the arrangement position of the filter,
The light reflected by the lens on the image sensor (CCD) side of the light quantity adjusting device is reflected again on the filter surface and enters the image sensor,
Since it may cause a ghost phenomenon, it is often installed on the front lens side of the blade so that the portion other than that required for the optical function of the filter is hidden by the blade when viewed from the image sensor side. In this case, more of the light rays incident from the front lens side will be received by the filter. At this time, the blade has a large area covered with the filter, and that portion only needs to receive the amount of heat rays that have been transmitted through the filter and dimmed.
Therefore, the temperature of the filter becomes higher than that of the blade,
It becomes easier to deform.
【００１４】以上のように、撮影条件によってフィルタ
ーは羽根よりも高温にさらされる場合が多く、そのため
に上記のような現象で光量調整装置自体の不具合につな
がることがある。As described above, the filter is often exposed to a temperature higher than that of the blade depending on the photographing conditions, which may lead to a malfunction of the light quantity adjusting device itself due to the above phenomenon.
【００１５】このような撮影条件は、ズームレンズがＴ
ＥＬＥ端で晴天時の昼の太陽が画角に入った状態であ
り、通常の撮影ではない偶然の機会の異常時とされてい
る。しかし数秒間でもカメラの動作不良という致命的不
具合を生じる条件である為、偶然の機会で上記条件にさ
らされても、少しでも長い時間不具合を生じさせないこ
とが望まれている。Under such photographing conditions, the zoom lens has a T
It is said that the daytime sun on a clear day entered the angle of view at the ELE end, and it is considered to be an accidental occasion that is not a normal shooting. However, since it is a condition that causes a fatal defect such as malfunction of the camera even for a few seconds, it is desired that the defect does not occur for a long time even if it is exposed to the above condition by chance.
【００１６】そこで本発明は、晴天時の昼の強い直射日
光下等で太陽光がレンズ画角内に入光するような撮影条
件においても、光量調整装置の不具合を少なくし、安定
して使用ができるものを提供するものである。Therefore, the present invention reduces troubles of the light quantity adjusting device and enables stable use even under shooting conditions in which sunlight enters the lens angle of view under strong direct sunlight in fine weather during daytime. It provides what you can do.
【００１７】[0017]
【課題を解決するための手段】光軸開口を有した基板
と、この基板に配置され移動することにより開口面積を
調整するプラスチック製光量調整羽根と、この光量調整
羽根により形成される開口を臨み移動可能に配置された
プラスチック製光量調整用フィルターとを備えた光量調
整装置において、前記フィルター材料は前記光量調整羽
根材料より１００℃以上から２１０℃以下の温度範囲で
熱収縮率が小さい材料を使用している光量調整装置であ
る。[Means for Solving the Problems] A substrate having an optical axis opening, a plastic light amount adjusting blade disposed on the substrate to adjust the opening area, and an opening formed by the light amount adjusting blade are exposed. In a light quantity adjusting device comprising a movably arranged plastic light quantity adjusting filter, the filter material is a material having a smaller heat shrinkage ratio than the light quantity adjusting vane material in a temperature range of 100 ° C. to 210 ° C. It is a light quantity adjusting device.
【００１８】そして、前記プラスチック製フィルターの
基体材料はノルボルネン系樹脂またはそれを含む材料で
あり、前記プラスチック製光量調整羽根の基体材料はポ
リエチレンテレフタレートまたはポリエチレンナフタレ
ートもしくはそれらを含む材料である。The base material of the plastic filter is a norbornene-based resin or a material containing the same, and the base material of the plastic light amount adjusting blade is a polyethylene terephthalate or a polyethylene naphthalate or a material containing them.
【００１９】また、前記フィルターは、前記光量調整羽
根の入射光側に配置した光量調整装置である。The filter is a light amount adjusting device arranged on the incident light side of the light amount adjusting blade.
【００２０】また、前記フィルターは前記光量調整羽根
の入射光側に配置されるとともに、可視光域のＮＤフィ
ルターであり、このＮＤフィルターは赤外線域の少なく
とも一部において、可視光域と同等以下の透過率を有し
ているものである。Further, the filter is arranged on the incident light side of the light quantity adjusting blade and is an ND filter in the visible light region. This ND filter has the same or less than the visible light region in at least a part of the infrared region. It has a transmittance.
【００２１】[0021]
【実施例】以下、本発明の実施例について、図面を参照
して説明する。図４及び図５は本発明による実施例のカ
メラの光量調整装置に適用したものの分解斜視図を示し
ている。Embodiments of the present invention will be described below with reference to the drawings. 4 and 5 show exploded perspective views of the light quantity adjusting device for a camera according to the embodiment of the present invention.
【００２２】図４のように光量調整装置Ｅは羽根駆動部
１０と、この羽根駆動部１０によって開閉駆動される絞
り部５０とから構成されている。As shown in FIG. 4, the light quantity adjusting device E comprises a blade drive unit 10 and a diaphragm unit 50 which is opened and closed by the blade drive unit 10.
【００２３】絞り部５０は図５のように羽根駆動部１０
を取り付ける地板５１と、第１の光量調整羽根Ｅ１と、
第２の光量調整羽根羽根Ｅ２と、地板５１の片面を覆
い、この地板５１との間に光量調整羽根Ｅ１，Ｅ２を摺
動自在に挟持する押さえ板７０と、光量調整羽根Ｅ１，
Ｅ２と係合し、羽根駆動部１０の駆動力を伝える作動レ
バー９０と、作動レバー９０を常に一方向に偏倚付勢す
る付勢バネ９５とを備えている。As shown in FIG. 5, the diaphragm unit 50 is a blade drive unit 10.
A base plate 51 for attaching the first light amount adjusting blade E1 and
A second light amount adjusting blade E2 and a pressing plate 70 that covers one surface of the base plate 51 and sandwiches the light amount adjusting blades E1 and E2 between the base plate 51 and the light amount adjusting blade E1.
An operating lever 90 that engages with E2 and transmits the driving force of the blade drive unit 10 and an urging spring 95 that constantly biases the operating lever 90 in one direction are provided.
【００２４】地板５１には図４のように、光軸開口５２
と、羽根駆動部１０の取り付け部５３と、この取り付け
部５３に形成された幾つかの係合突起５５ａ，５５ｂ，
５６ａ，５６ｂと、嵌着用のリブ５７ａ，５７ｂと、駆
動軸貫通用の小孔５４と、リード線プリント板３８を保
持するための係止突起５８ａ，５８ｂとが設けられてい
る。なお、光軸開口５２には後述するＮＤフィルター８
９の移動を妨げないように逃げ部５２Ｎが形成されてい
る。As shown in FIG. 4, the main plate 51 has an optical axis opening 52.
And a mounting portion 53 of the blade drive unit 10 and some engagement protrusions 55a, 55b formed on the mounting portion 53,
56a and 56b, fitting ribs 57a and 57b, a small hole 54 for penetrating the drive shaft, and locking projections 58a and 58b for holding the lead wire printed board 38 are provided. In addition, the ND filter 8 described later is provided in the optical axis opening 52.
An escape portion 52N is formed so as not to hinder the movement of 9.
【００２５】更に地板５１には光量調整羽根Ｅ１，Ｅ２
が互いに摺接しないで移動できるように、これら羽根Ｅ
１，Ｅ２と摺動係合する係合ピン５９ａ，５９ｂや、羽
根Ｅ１，Ｅ２を浮かせるための突起６１ａ〜６１ｈなど
が設けられている。Further, on the base plate 51, light quantity adjusting blades E1 and E2 are provided.
So that they can move without sliding contact with each other.
Engagement pins 59a and 59b slidably engaged with 1 and E2, and projections 61a to 61h for floating the blades E1 and E2 are provided.
【００２６】作動レバー９０には羽根駆動部１０の駆動
軸を嵌着させる孔９１と、光量調整羽根Ｅ１，Ｅ２と係
合するピン部９２ａ，９２ｂとが設けられている。The actuating lever 90 is provided with a hole 91 into which the drive shaft of the blade drive unit 10 is fitted, and pin portions 92a and 92b which engage with the light amount adjusting blades E1 and E2.
【００２７】光量調整羽根Ｅ１は黒色に着色されたＰＥ
ＴまたはＰＥＮの薄片などで形成され、図５のように光
量を規制するための絞り開口形成部８０と、ピン部９２
ｂと嵌合する小孔８２と、係合ピン５９ｂと係合する長
穴８３とが設けられている。The light quantity adjusting blade E1 is made of PE colored in black.
A diaphragm opening forming portion 80 for restricting the amount of light and a pin portion 92 formed of a thin piece of T or PEN or the like, as shown in FIG.
A small hole 82 for fitting with b and an elongated hole 83 for fitting with the engaging pin 59b are provided.
【００２８】一方、光量調整羽根Ｅ２も黒色に着色され
たＰＥＴまたはＰＥＮの薄片などで形成され、光量を規
制するための絞り開口形成部８５と、ピン部９２ａと嵌
合する小孔８７と、係合ピン５９ａと係合する長穴８８
とが設けられている。なお、羽根開口形成部８５は羽根
Ｅ１の羽根開口形成部８０と共に、絞り開口を形成す
る。On the other hand, the light quantity adjusting blade E2 is also made of a thin piece of PET or PEN colored in black or the like, and has a diaphragm opening forming portion 85 for regulating the light quantity, a small hole 87 for fitting with the pin portion 92a, Long hole 88 that engages with the engagement pin 59a
And are provided. The blade opening forming portion 85 forms a diaphragm opening together with the blade opening forming portion 80 of the blade E1.
【００２９】そして、羽根Ｅ１の絞り開口形成部８０の
最深部には、プラスチック製の光量調整用フィルター部
材例えばＮＤフィルター（Ｎｅｕｔｒａｌ Ｄｅｎｓｉ
ｔｙＦｉｌｔｅｒ）８９が貼着されている。At the deepest portion of the aperture opening forming portion 80 of the blade E1, a plastic light amount adjusting filter member such as an ND filter (Neutral Densi) is provided.
tyFilter) 89 is attached.
【００３０】この実施例におけるＮＤフィルター８９
は、材質が羽根の材質よりも１００℃以上から２１０℃
以下の温度範囲で熱収縮率が小さい材質、例えばノルボ
ルネン系樹脂の透明シート材に蒸着法にて無機質膜を形
成させ、この無機質膜に光学的フィルター特性を持たせ
るようにし、その後プレス加工にて必要なフィルター形
状にして、羽根Ｅ１の開口形成部８０の凹形状最深部に
図６のように配置し、開口形成部の凹形状に沿った略Ｕ
字形状で両側部から所定の距離の位置の貼着部までつな
げている。ND filter 89 in this embodiment
Is more than 100 ℃ to 210 ℃ than the material of the blade.
A material having a small heat shrinkage ratio in the following temperature range, for example, a transparent sheet material of norbornene-based resin is formed with an inorganic film by an evaporation method so that the inorganic film has an optical filter characteristic, and then press working is performed. A filter having a required shape is arranged at the deepest portion of the concave portion of the opening forming portion 80 of the blade E1 as shown in FIG.
It is shaped like a letter and is connected from both sides to the attachment part at a specified distance.
【００３１】ＮＤフィルターの別の実施例として、材質
が羽根の材質よりも１００℃以上から２１０℃以下の温
度範囲で熱収縮率が小さい材質、例えばノルボルネン系
樹脂の透明シート材に有機色素または顔料を混入して光
学的フィルター特性を持たせて、シート形状に成形加工
し、その後プレス加工にて必要なフィルター形状にして
もよい。As another embodiment of the ND filter, a material having a smaller heat shrinkage ratio than the material of the blade in the temperature range of 100 ° C. to 210 ° C., for example, a transparent sheet material of norbornene-based resin and an organic dye or pigment. May be mixed to give an optical filter characteristic, and formed into a sheet shape, and then pressed into a required filter shape.
【００３２】押さえ板７０には光路開口７１と、作動レ
バー９０のピン部９２ａ，９２ｂが回動できるように形
成された長穴７２ａ，７２ｂと、地板５１と結合する結
合部７４ａ，７４ｂと、係合ピン５９ａ，５９ｂが臨む
穴７５ａ，７５ｂと、光量調整羽根Ｅ１，Ｅ２を浮かせ
るための突起６２ａ〜６２ｄとが設けられている。The pressing plate 70 has an optical path opening 71, elongated holes 72a and 72b formed so that the pin portions 92a and 92b of the actuating lever 90 can rotate, and coupling portions 74a and 74b for coupling with the base plate 51. Holes 75a and 75b exposed by the engagement pins 59a and 59b and projections 62a to 62d for floating the light amount adjusting blades E1 and E2 are provided.
【００３３】なお、光軸開口７１には光量調整羽根Ｅ２
にＮＤフィルター８９に貼った場合にＮＤフィルター８
９の移動を妨げないために逃げ部７１Ｎが形成されてい
る。The light quantity adjusting blade E2 is provided in the optical axis opening 71.
ND filter 8 when attached to ND filter 89
An escape portion 71N is formed so as not to hinder the movement of 9.
【００３４】次に羽根駆動部１０の構成を説明する。羽
根駆動部１０は、図４のように中心部に回動自在に枢支
された永久磁石体１１と、この永久磁石体１１を囲む結
合側ボビン１４及びピン側ボビン２５と、図７のように
両ボビン１４，２５に巻回された駆動コイル１３０Ａ及
び制動コイル１３０Ｂと、両ボビン１４，２５の外周に
嵌着して永久磁石体１１の磁気を導く中空円筒形の磁気
回路部材（ヨーク）３５と、この磁気回路部材３５の端
部を押える端板３６と、永久磁石体１１の回転角度位置
を検出する磁気センサ３７を有し、この磁気センサ３７
及び各コイル１３０Ａ，１３０Ｂに接続される導線プリ
ント板３８とから構成されている。Next, the structure of the blade drive unit 10 will be described. As shown in FIG. 7, the blade drive unit 10 includes a permanent magnet body 11 rotatably supported at the center as shown in FIG. 4, a coupling side bobbin 14 and a pin side bobbin 25 surrounding the permanent magnet body 11. A driving coil 130A and a braking coil 130B wound around both bobbins 14 and 25, and a hollow cylindrical magnetic circuit member (yoke) fitted to the outer circumferences of both bobbins 14 and 25 to guide the magnetism of the permanent magnet body 11. 35, an end plate 36 that presses the end of the magnetic circuit member 35, and a magnetic sensor 37 that detects the rotational angle position of the permanent magnet body 11.
And a conductor printed board 38 connected to the coils 130A and 130B.
【００３５】永久磁石体１１は円筒形のマグネット１２
と、このマグネット１２の円筒中心を貫通して固定され
た駆動軸１３とから構成され、ボビン１４とボビン２５
との内部に回動自在に枢支されている。The permanent magnet body 11 is a cylindrical magnet 12
And a drive shaft 13 fixed through the center of the magnet 12 to form a bobbin 14 and a bobbin 25.
And is rotatably supported inside.
【００３６】ボビン２５の上部にはコイル１３０Ａ，１
３０Ｂの線端を巻回する端子ピン２９ａ，２９ｂ，２９
ｃ，２９ｄが設けられている。そして磁気回路部材３５
を嵌め込み、端板３６を被せ、しかる後、導線プリント
板３８に形成された４個の小孔に端子ピン２９ａ，２９
ｂ，２９ｃ，２９ｄを通しながら載せる。そして最後に
端子ピン２９ａ，２９ｂ，２９ｃ，２９ｄと導線プリン
ト板３８とをハンダ等で結合することにより、羽根駆動
部１０の組み立ては完了する。Above the bobbin 25, coils 130A, 1
Terminal pins 29a, 29b, 29 for winding the wire end of 30B
c and 29d are provided. And the magnetic circuit member 35
The end plates 36, and then the terminal pins 29a, 29 are inserted into the four small holes formed in the printed wiring board 38.
Place while passing b, 29c, 29d. Finally, by assembling the terminal pins 29a, 29b, 29c, 29d and the printed wiring board 38 with solder or the like, the assembly of the blade drive unit 10 is completed.
【００３７】以上により作られた光量調整装置は図１に
示すようにデジタルスチルカメラやビデオカメラのレン
ズ光学系に組み入れられる。The light quantity adjusting device produced as described above is incorporated into a lens optical system of a digital still camera or a video camera as shown in FIG.
【００３８】レンズ光学系の前玉１０３から入射した光
線は光量調整装置１０４を通ってＣＣＤ撮像素子１０５
で結像し、ＣＣＤ撮像素子１０５にて光電変換され信号
処理回路で輝度が検出されてＣＰＵに送られる。ＣＰＵ
は被写体輝度が一定になるように光量を調整するよう光
量調整装置の駆動部１０を駆動する。A light beam incident from the front lens 103 of the lens optical system passes through a light amount adjusting device 104 and a CCD image pickup device 105.
Then, the image is formed, the photoelectric conversion is performed by the CCD image pickup device 105, the brightness is detected by the signal processing circuit, and the brightness is sent to the CPU. CPU
Drives the driving unit 10 of the light amount adjusting device so as to adjust the light amount so that the subject brightness becomes constant.
【００３９】このとき、入射する光量が多い場合は光量
調整装置の羽根Ｅ１，Ｅ２及びＮＤフィルター８９が光
量を適度にするよう光線の一部を遮るように光軸開口内
５２に進入してくる。図示の光線はズームレンズがＴＥ
ＬＥ端の状態であり、前玉レンズ開口径Ｇで受けた光線
は光量調整装置の光軸開口径Ｈで数倍に集光されてい
る。このために、晴天時の昼の太陽が画角に入った時に
は、その光線に含まれる熱光線も集光される為、光軸開
口５２内は高温となる。前玉径Ｇと光軸開口径Ｈとの比
率でその最高温度は異なり、幾種類かの前玉レンズでの
試験では図２のように時間経過とともに上昇して最高温
度は８０℃から２１０℃にもなる。At this time, when the incident light amount is large, the blades E1 and E2 of the light amount adjusting device and the ND filter 89 enter the optical axis opening 52 so as to block a part of the light beam so that the light amount becomes appropriate. . The illustrated light beam is TE
In the LE end state, the light beam received by the front lens aperture diameter G is condensed several times by the optical axis aperture diameter H of the light quantity adjusting device. Therefore, when the daytime sun in fine weather enters the angle of view, the heat ray included in the ray is also condensed, and the inside of the optical axis aperture 52 becomes hot. The maximum temperature differs depending on the ratio between the front lens diameter G and the optical axis aperture diameter H. In tests with several front lens elements, the maximum temperature rises with time as shown in FIG. It also becomes.
【００４０】またＮＤフィルター８９は羽根のハンチン
グや回折現象を防止する為に、羽根Ｅ１、Ｅ２よりも先
に光軸開口内に臨み光軸中央を覆う必要があるため、羽
根よりもより多く光線を受け、より高温にさらされるこ
とになる。そして前述したように羽根Ｅ１，Ｅ２及びフ
ィルター８９は不具合を起こす変形温度に達して光量調
整装置の動作不良につながるが、本実施例ではＮＤフィ
ルター材料が羽根材料よりも高温での熱収縮率が小さい
ので不具合につながるまでの時間が長くなる。Further, in order to prevent the hunting and the diffraction phenomenon of the blades, the ND filter 89 needs to enter the optical axis opening and cover the center of the optical axis before the blades E1 and E2. Will be exposed to higher temperatures. Then, as described above, the blades E1 and E2 and the filter 89 reach a deformation temperature that causes a malfunction, which leads to malfunction of the light amount adjusting device. However, in this embodiment, the ND filter material has a heat shrinkage ratio at a higher temperature than the blade material. Since it is small, it takes a long time to lead to a malfunction.
【００４１】したがって前述したように通常の撮影条件
外とされている偶然の機会で上記条件にさらされても、
長い時間不具合を生じさせないことができる。Therefore, as described above, even if exposed to the above-mentioned condition by a chance that it is out of the normal photographing condition,
It is possible to prevent troubles for a long time.
【００４２】また、本実施例ではＮＤフィルター８９が
羽根Ｅ１，Ｅ２の入光側に配置しているため、入射する
光線は、そのほとんどをＮＤフィルター８９で受けるこ
とになる。ＮＤフィルターはその材料が羽根材料よりも
高温での熱収縮率が小さいので不具合につながるまでの
時間が長い。そして羽根はより高温となる光軸中央部に
近い部分をＮＤフィルターに覆われているので、ＮＤフ
ィルターを透過し減衰した熱線の分を受けるだけで済
む。Further, in this embodiment, since the ND filter 89 is arranged on the light incident side of the blades E1 and E2, most of the incident light rays will be received by the ND filter 89. Since the material of the ND filter has a smaller thermal shrinkage at a higher temperature than the blade material, it takes a long time to lead to a defect. Since the blade is covered with the ND filter at a portion near the center of the optical axis where the temperature becomes higher, it is sufficient to receive the heat ray that has been transmitted through the ND filter and attenuated.
【００４３】またこのＮＤフィルターの光学特性が可視
光域のＮＤフィルターでありながら、赤外線域の少なく
とも一部においても可視光域と同等以下の透過率を有し
ていれば、可視光域での光学特性を維持しながら、太陽
光に含まれる赤外線つまり熱線を一部でもこのＮＤフィ
ルター部で吸収されるので、羽根に及ぼす熱線の影響を
少なくすることができる。Further, if the optical characteristics of this ND filter are those of the visible light range, but have a transmittance equal to or lower than that of the visible light range even in at least a part of the infrared range, While maintaining the optical characteristics, even the infrared rays contained in sunlight, that is, the heat rays are partially absorbed by the ND filter portion, so that the influence of the heat rays on the blades can be reduced.
【００４４】このように本発明では、晴天時の昼の太陽
光が入光するような撮影条件においても、フィルターや
羽根の熱収縮による変形を小さくし、光量調整装置の不
具合を少なくすることが可能である。
〔その他の実施例〕本発明は前記実施例に限定されるも
のではなく、図８に示すように羽根Ｅ１，Ｅ２同士を互
いに相対的に逆方向へ移動して、羽根部材の絞り開口形
成部により形成される開口の大きさを可変し、開口形成
部に寄与しないフィルター８９を駆動する駆動部１０ｂ
を持つ光量調整装置にも適応できる。As described above, according to the present invention, it is possible to reduce the deformation of the filters and the blades due to the thermal contraction and to reduce the problems of the light quantity adjusting device even under the shooting conditions in which daytime sunlight is incident on fine weather. It is possible. [Other Embodiments] The present invention is not limited to the above-mentioned embodiments, and the blades E1 and E2 are moved in mutually opposite directions as shown in FIG. The driving unit 10b that drives the filter 89 that does not contribute to the opening forming unit by changing the size of the opening formed by
It can also be applied to a light quantity adjusting device having a.
【図１】本発明による光量調整装置を用いたレンズ光学
系と光量調整装置の駆動を説明の為のブロック図であ
る。FIG. 1 is a block diagram for explaining driving of a lens optical system and a light amount adjusting device using a light amount adjusting device according to the present invention.
【図２】光量調整装置の光軸開口部の温度上昇の測定結
果。FIG. 2 is a measurement result of a temperature rise of an optical axis opening of the light quantity adjusting device.
【図３】従来事例で羽根Ｅ１及びフィルター８９は変形
したようすを示した図。FIG. 3 is a view showing how the blade E1 and the filter 89 are deformed in the conventional case.
【図４】本発明の実施例にかかわるカメラの絞り装置の
全体構造を示す分解斜視図である。FIG. 4 is an exploded perspective view showing the overall structure of a diaphragm device for a camera according to an embodiment of the present invention.
【図５】図４の絞り部の分解斜視図である。5 is an exploded perspective view of the diaphragm unit of FIG.
【図６】図５の光量調整用フィルターと光量調整羽根の
構成説明図である。FIG. 6 is a configuration explanatory view of a light amount adjusting filter and a light amount adjusting blade of FIG.
【図７】図４の羽根駆動部の構造を示す分解斜視図であ
る。7 is an exploded perspective view showing the structure of the blade drive unit in FIG.
【図８】その他の実施例の光量調整装置である。FIG. 8 is a light amount adjusting device according to another embodiment.
１０ 羽根駆動部 １０ｂ フィルター駆動部 ５２ 光軸開口 ８９ フィルター １００ レンズ鏡筒 １０１ レンズ １０２ レンズ １０３ 前玉レンズ １０４ 光量調整装部 １０５ ＣＣＤ撮像素子 Ｅ１ 第１の光量調整羽根 Ｅ２ 第２の光量調整羽根 Ｇ 前玉レンズの開口径 Ｈ 光量調整装置の光軸開口径 10 Blade drive 10b Filter drive unit 52 Optical axis aperture 89 Filter 100 lens barrel 101 lens 102 lens 103 Front lens 104 Light intensity adjustment unit 105 CCD image sensor E1 First light amount adjusting blade E2 Second light amount adjusting blade G Front lens aperture diameter H Optical axis opening diameter of light quantity adjusting device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０４Ｎ 5/225 Ｈ０４Ｎ 5/225 Ｄ Ｆターム(参考） 2H042 AA06 AA08 AA22 2H044 AG01 2H080 AA10 AA20 AA31 DD07 2H083 AA04 AA05 AA11 AA19 AA22 AA32 AA35 AA41 AA50 AA53 5C022 AB03 AC55 AC56 AC78 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) H04N 5/225 H04N 5/225 DF term (reference) 2H042 AA06 AA08 AA22 2H044 AG01 2H080 AA10 AA20 AA31 DD07 2H083 AA04 AA05 AA11 AA19 AA22 AA32 AA35 AA41 AA50 AA53 5C022 AB03 AC55 AC56 AC78
Claims (6)
置され移動することにより開口面積を調整するプラスチ
ック製光量調整羽根と、この光量調整羽根により形成さ
れる開口を臨み移動可能に配置されたプラスチック製光
量調整用フィルターとを備えた光量調整装置において、
前記フィルター材料は前記光量調整羽根材料より１００
℃以上から２１０℃以下の温度範囲で熱収縮率が小さい
ことを特徴とする光量調整装置。1. A substrate having an optical axis opening, a plastic light amount adjusting blade arranged on the substrate to adjust an opening area by moving, and an opening formed by the light amount adjusting blade so as to face and move. In the light amount adjusting device provided with the plastic light amount adjusting filter
The filter material is 100% thicker than the light quantity adjusting blade material.
A light quantity adjusting device having a small heat shrinkage ratio in a temperature range from ℃ to 210 ℃.
料はノルボルネン系樹脂またはそれを含む材料であり、
前記プラスチック製光量調整羽根の基体材料はポリエチ
レンテレフタレートまたはポリエチレンナフタレートも
しくはそれらを含む材料であることを特徴とする請求項
１記載の光量調整装置。2. The base material of the plastic filter is a norbornene resin or a material containing the same.
2. The light quantity adjusting device according to claim 1, wherein the base material of the plastic light quantity adjusting blade is polyethylene terephthalate, polyethylene naphthalate, or a material containing them.
ラスチック基板に蒸着法によりフィルター層を設けたこ
とを特徴とする請求項１記載の光量調整装置。3. The light quantity adjusting device according to claim 1, wherein the plastic filter is provided with a filter layer on a transparent plastic substrate by a vapor deposition method.
入射光側に配置したことを特徴とする請求項１記載の光
量調整装置。4. The light amount adjusting device according to claim 1, wherein the filter is arranged on the incident light side of the light amount adjusting blade.
ターであり、このＮＤフィルターは赤外線域の少なくと
も一部において、可視光域と同等以下の透過率を有して
いることを特徴とする請求項４記載の光量調整装置。5. The filter is a visible light ND filter, and the ND filter has a transmittance equal to or lower than that of the visible light region in at least a part of the infrared light region. 4. The light amount adjusting device according to 4.
量調整装置を使用したことを特徴とするカメラ。6. A camera using the light quantity adjusting device according to claim 1. Description:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001332572A JP2003140226A (en) | 2001-10-30 | 2001-10-30 | Light quantity adjusting device and camera using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001332572A JP2003140226A (en) | 2001-10-30 | 2001-10-30 | Light quantity adjusting device and camera using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003140226A true JP2003140226A (en) | 2003-05-14 |
Family
ID=19147965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001332572A Pending JP2003140226A (en) | 2001-10-30 | 2001-10-30 | Light quantity adjusting device and camera using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003140226A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006121773A (en) * | 2004-10-19 | 2006-05-11 | Sony Corp | Imaging apparatus and drive motor |
| JP2006139223A (en) * | 2004-11-15 | 2006-06-01 | Nippon Seimitsu Sokki Kk | Optical filter of diaphragm device, and diaphragm device |
| JP2006301488A (en) * | 2005-04-25 | 2006-11-02 | Nidec Copal Corp | Near-infrared ray cut filter for imaging optical system and its manufacturing method |
| JP2010049136A (en) * | 2008-08-25 | 2010-03-04 | Nisca Corp | Light quantity regulato, and imaging device with same |
-
2001
- 2001-10-30 JP JP2001332572A patent/JP2003140226A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006121773A (en) * | 2004-10-19 | 2006-05-11 | Sony Corp | Imaging apparatus and drive motor |
| JP4623364B2 (en) * | 2004-10-19 | 2011-02-02 | ソニー株式会社 | Imaging device and drive motor |
| JP2006139223A (en) * | 2004-11-15 | 2006-06-01 | Nippon Seimitsu Sokki Kk | Optical filter of diaphragm device, and diaphragm device |
| JP2006301488A (en) * | 2005-04-25 | 2006-11-02 | Nidec Copal Corp | Near-infrared ray cut filter for imaging optical system and its manufacturing method |
| JP2010049136A (en) * | 2008-08-25 | 2010-03-04 | Nisca Corp | Light quantity regulato, and imaging device with same |
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