JP2008278287A - Optical filter mounting structure - Google Patents
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本発明は撮像装置に係り、特に撮像レンズと撮像素子間の光路中に挿入する光学フィルタの取付構造に関する。 The present invention relates to an imaging apparatus, and more particularly, to an optical filter mounting structure that is inserted into an optical path between an imaging lens and an imaging element.
近年、固体撮像素子を使用するテレビジョンカメラでは、固体撮像素子受光面に微細な受光素子が規則正しく配列され、光学像を２次元的にサンプリングすることによって画像信号を得ている。しかし、このサンプリングのために細かい被写体を撮影したときモアレが発生して偽信号が現れることがある。 In recent years, in a television camera using a solid-state image sensor, fine light-receiving elements are regularly arranged on the light-receiving surface of the solid-state image sensor, and an image signal is obtained by sampling an optical image two-dimensionally. However, when a fine subject is photographed for this sampling, moire may occur and a false signal may appear.
この現象を避けるために、光学ローパスフィルタを撮像レンズと固体撮像素子間に配置している。前記光学ローパスフィルタには複屈折を利用した水晶ローパスフィルタを所望の方向で薄くカットして利用されている。 In order to avoid this phenomenon, an optical low-pass filter is disposed between the imaging lens and the solid-state imaging device. As the optical low-pass filter, a crystal low-pass filter using birefringence is thinly cut in a desired direction.
一方、固体撮像素子の高画素化が図られ、高解像度化とモアレ防止に対応するため、さらに薄くカットした水晶ローパスフィルタを複数枚重ねて使用する場合もあり、また赤外カットフィルタをさらに重装する場合もある。 On the other hand, in order to increase the number of pixels of the solid-state image sensor and to cope with higher resolution and prevention of moire, multiple thin crystal low-pass filters may be used in layers, and an infrared cut filter may be added. There is also a case.
図４（ａ）の従来例の光学フィルタが装着されたカメラ光学系の断面図、（ｂ）従来例の光学フィルタ正面図及び図５の従来例の光学フィルタが装着されたフィルタ取付枠の斜視図によれば、カメラ光学系１は、カメラフロントパネル２と、センサ基板６に装着された固体撮像素子７間に配設され光学フィルタ５’が装着されたフィルタ取付枠３’と防塵マスク８で構成されている。 4A is a cross-sectional view of a camera optical system on which the conventional optical filter of FIG. 4A is mounted, FIG. 4B is a front view of the optical filter of the conventional example, and a perspective view of a filter mounting frame on which the optical filter of the conventional example of FIG. According to the figure, the camera optical system 1 is arranged between a camera front panel 2 and a solid-state image sensor 7 mounted on a sensor substrate 6 and a filter mounting frame 3 ′ mounted with an optical filter 5 ′ and a dust mask 8. It consists of
カメラフロントパネル２には図示しない撮像レンズが装着され、該撮像レンズで撮像された被写体像は前記光学フィルタ５’を介して固体撮像素子７の受光面に結像される。 An imaging lens (not shown) is mounted on the camera front panel 2, and a subject image captured by the imaging lens is formed on the light receiving surface of the solid-state imaging device 7 through the optical filter 5 '.
光学フィルタ５’は、フィルタ取付枠３’に穿設されたフィルタ用孔３”に装着され、フィルタ止め枠４’に当接し、その周囲の当接面１１を接着材等で貼着されている。
ここで、図で示すように、光学フィルタ５’のその表面とフィルタ止め枠４’の開口部に段差１０が生じているため、清掃しにくく、刷毛や布でフィルタ面を清掃したり、乾燥空気を吹き付けても段差１０部分にゴミが残る危険があり、残ったゴミが後日フィルタ面に付着し、画面に黒傷として現れる不具合を生ずる場合がある。 Here, as shown in the figure, since a step 10 is formed on the surface of the optical filter 5 ′ and the opening of the filter retaining frame 4 ′, it is difficult to clean, and the filter surface can be cleaned with a brush or cloth or dried. Even if air is blown, there is a risk that dust may remain on the step 10 portion, and the remaining dust may adhere to the filter surface at a later date, resulting in a defect that appears as black scratches on the screen.
また、特許文献１に示すように、光学フィルタ装着後、その上からフィルタ止め枠に当接し固定するが、フィルタ止め枠の開口部分と光学フィルタ表面に段差が生じているため、刷毛や布でフィルタ面を清掃したり、乾燥空気を吹き付けても段差部分にゴミが残る危険があり、残ったゴミが後日フィルタ面に付着し、画面に黒傷として現れる不具合を生ずる場合がある。 Also, as shown in Patent Document 1, after mounting the optical filter, the filter stop frame is contacted and fixed from above, but there is a step between the opening of the filter stop frame and the surface of the optical filter. Even if the filter surface is cleaned or dry air is blown, there is a risk that dust may remain on the stepped portion, and the remaining dust may adhere to the filter surface at a later date, resulting in a defect that appears as black scratches on the screen.
本願発明者は、上記に鑑み鋭意研究の結果、次の手段によりこの課題を解決した。
（１）撮像素子を使用したテレビジョンカメラにおいて、撮像レンズと撮像素子間の光路に挿入され複数枚重装された角形状又は円形状光学フィルタと、該光学フィルタを装着するフィルタ挿入孔を有するフィルタ取付枠を備え、
前記複数枚重装された光学フィルタの、前記撮像レンズ側、又は撮像素子側のいずれか一方、又は双方の表面が、前記フィルタ取付枠の表面と一致して、前記フィルタ挿入孔に装着されてなることを特徴とする光学フィルタ取付構造。
The inventor of the present application has solved this problem by the following means as a result of intensive studies in view of the above.
(1) A television camera using an image sensor has a rectangular or circular optical filter that is inserted into an optical path between the image pickup lens and the image sensor and is overlapped, and a filter insertion hole for mounting the optical filter. With a filter mounting frame,
The surface of either one or both of the imaging lens side or the imaging element side of the plurality of stacked optical filters coincides with the surface of the filter mounting frame and is mounted in the filter insertion hole. An optical filter mounting structure characterized by comprising:
（２）撮像素子を使用したテレビジョンカメラにおいて、撮像レンズと撮像素子間の光路に挿入され複数枚重装された角形状又は円形状光学フィルタと、該光学フィルタを装着するフィルタ挿入孔を有するフィルタ取付枠を備え、
前記複数枚重装された光学フィルタの、前記撮像レンズ側、又は撮像素子側のいずれか一方、又は双方の表面が、前記フィルタ取付枠の表面から突出して、前記フィルタ挿入孔に装着されてなることを特徴とする光学フィルタ取付構造。
(2) A television camera using an image sensor has a square or circular optical filter inserted in the optical path between the image pickup lens and the image sensor, and a plurality of overlapping optical filters, and a filter insertion hole for mounting the optical filter. With a filter mounting frame,
The surface of one or both of the image pickup lens side and the image pickup element side of the multiple optical filters mounted in a plurality is projected from the surface of the filter mounting frame and is mounted in the filter insertion hole. An optical filter mounting structure characterized by that.
（３）前記複数枚重装された角形状光学フィルタが、該光学フィルタの上層又は下層の少なくとも１枚を残し、前記撮像レンズ側、又は撮像素子側のいずれか一方の１枚又は複数枚の撮像に支障ない角形状の２〜４隅端が切除され、かつ該切除部分の形状に合わせて前記フィルタ取付枠開口部の枠材の一部が残置され、さらに切除されていない前記上層又は下層の光学フィルタが前記フィルタ取付枠の前記フィルタ挿入孔に挿入され前記残置された枠材の一部に当接して装着されてなることを特徴とする前項（１）又は（２）に記載の光学フィルタ取付構造。 (3) The plurality of stacked rectangular optical filters leave at least one of the upper layer and the lower layer of the optical filter, and one or more of either the imaging lens side or the imaging element side The upper layer or the lower layer in which two to four corners having a rectangular shape that does not hinder imaging are excised, and a part of the frame material of the filter attachment frame opening is left in accordance with the shape of the excised portion, and is not further excised The optical filter according to the item (1) or (2), wherein the optical filter is mounted in contact with a part of the remaining frame member inserted into the filter insertion hole of the filter mounting frame. Filter mounting structure.
（４）前記複数枚重装された円形状光学フィルタが、該光学フィルタの上層又は下層の少なくとも１枚を残し、前記撮像レンズ側、又は撮像素子側のいずれか一方の１枚又は複数枚の撮像に支障ない円形状の周縁部の上下端、左右端のいずれか一方、又は両方が切除され、かつ該切除部分の形状に合わせて前記フィルタ取付枠開口部の枠材の一部が残置され、さらに切除されていない前記上層又は下層の光学フィルタが前記フィルタ取付枠の前記フィルタ挿入孔に挿入され前記残置された枠材の一部に当接して装着されてなることを特徴とする前項（１）又は（２）に記載の光学フィルタ取付構造。 (4) The plurality of circular optical filters stacked on top of each other leave at least one of the upper layer or the lower layer of the optical filter, and one or more of either the imaging lens side or the imaging element side Either one or both of the upper and lower ends and the left and right ends of the circular peripheral edge that does not interfere with imaging are cut off, and a part of the frame material of the filter mounting frame opening is left in accordance with the shape of the cut portion. Further, the upper layer or the lower layer optical filter which is not further cut is inserted into the filter insertion hole of the filter mounting frame and attached to a part of the left frame member (attached) The optical filter mounting structure according to 1) or (2).
（５）前記撮像素子の撮像面側ガラス表面と、該撮像面側ガラス表面と相対する前記光学フィルタ表面との間に弾力性材の防塵用マスクを双方表面に密接させて装着してなることを特徴とする前項（１）〜（４）のいずれか１項に記載の光学フィルタ取付構造。 (5) A dustproof mask made of an elastic material is mounted between the imaging surface side glass surface of the imaging element and the optical filter surface facing the imaging surface side glass surface in close contact with both surfaces. The optical filter mounting structure according to any one of the preceding items (1) to (4), characterized in that:
本願発明によれば、次のような効果が発揮される。
１．本願発明の請求項１又は２の発明によれば、
前記複数枚重装された光学フィルタの、前記撮像レンズ側、又は撮像素子側のいずれか一方、又は双方の表面が、前記フィルタ取付枠の光軸方向の表面と一致して、又は前記光学フィルタの表面から突出して前記フィルタ挿入孔に装着されているので、刷毛又は布でゴミを拭ききることができ、乾燥空気を吹き付けても、フィルタ面にゴミ等が残ることなく、作業性を著しく向上する。したがって生産効率を大幅に改善することができる。
According to the present invention, the following effects are exhibited.
1. According to the invention of claim 1 or 2 of the present invention,
The surface of either one or both of the image pickup lens side or the image pickup element side of the plurality of stacked optical filters coincides with the surface in the optical axis direction of the filter mounting frame, or the optical filter Since it protrudes from the surface of the filter and is installed in the filter insertion hole, dust can be wiped off with a brush or cloth, and even if dry air is blown, dust does not remain on the filter surface and the workability is remarkably improved. To do. Therefore, production efficiency can be greatly improved.
また、清掃に特別な技術を必要とせず、顧客がフィルタ面を清掃する場合でも同様な効果を期待できる。 Further, no special technique is required for cleaning, and the same effect can be expected even when the customer cleans the filter surface.
２．本願発明の請求項３及び請求項４の発明によれば、
請求項１及び２の効果に加えて、前記複数枚重装された角形状又は円形状光学フィルタが、該光学フィルタの上層又は下層の少なくとも１枚を残し、前記撮像レンズ側、又は撮像素子側のいずれか一方の１枚又は複数枚の撮像に支障ない角形状の隅端又は円形状の周縁部の上下端、左右端のいずれか一方、又は両方が切除され、かつ該切除部分の形状に合わせて前記フィルタ取付枠開口部の枠材の一部が残置され、さらに切除されていない前記上層又は下層の光学フィルタが前記フィルタ取付枠の前記フィルタ挿入孔に挿入され前記残置された枠材の一部に当接して装着する方式のため、密閉性が向上し、また、同じ形状の光学フィルタを量産することができ、効率的な生産と、コストダウンができる。
2. According to the invention of claim 3 and claim 4 of the present invention,
In addition to the effects of Claims 1 and 2, the plurality of stacked rectangular or circular optical filters leave at least one of the upper or lower layers of the optical filter, and are on the imaging lens side or imaging element side Either one or both of the corners of the square shape or the upper and lower ends of the circular peripheral edge, the left and right ends, or both are cut off, and the shape of the cut portion is not affected. In addition, a part of the frame material of the filter mounting frame opening is left, and the upper or lower optical filter that is not cut is inserted into the filter insertion hole of the filter mounting frame and the left frame material Due to the method of mounting in contact with a part, the sealing performance is improved, and the optical filter having the same shape can be mass-produced, so that efficient production and cost reduction can be achieved.
また、前記光学フィルタとフィルタ取付枠間に隙間を生じないため、清掃時にゴミ・ほこり等が残留せず、したがって後日ゴミ・ほこり等による黒傷等画面上の欠陥を生じる恐れが無い。 In addition, since no gap is formed between the optical filter and the filter mounting frame, dust, dust, or the like does not remain at the time of cleaning. Therefore, there is no possibility of causing defects on the screen such as black scratches due to dust, dust, etc. at a later date.
３．本願発明の請求項５の発明によれば、
請求項１〜４の効果に加えて、前記撮像素子の撮像面側ガラス表面と、該撮像面側ガラス表面と相対する前記光学フィルタ表面との間に弾力性材の防塵用マスクを双方表面に密接させて装着しているので、撮像面側ガラス表面とフィルタ表面間が密室状態になり、さらに防塵性に優れた光学系を構築することができる。
3. According to the invention of claim 5 of the present invention,
In addition to the effects of claims 1 to 4, a dustproof mask made of an elastic material is provided on both surfaces between the imaging surface side glass surface of the imaging element and the optical filter surface facing the imaging surface side glass surface. Since they are mounted in close contact with each other, the space between the imaging surface side glass surface and the filter surface is in a closed chamber state, and an optical system with excellent dust resistance can be constructed.
本願発明を実施するための最良の形態を実施例図を用いて詳細に説明する。
図１は本願発明の光学フィルタ取付構造における光学フィルタが装着されたカメラ光学系の実施例断面図であり、図２（ａ）は同発明の四角形状フィルタの実施例正面図及び側面図であり、図２（ｂ）は同発明の円形状フィルタの実施例正面図及び側面図であり、図３は同発明のフィルタ取付枠を含むカメラ光学系の分解斜視図である。
The best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of an embodiment of a camera optical system to which an optical filter in the optical filter mounting structure of the present invention is mounted, and FIG. 2A is a front view and a side view of an embodiment of the rectangular filter of the present invention. 2B is a front view and a side view of an embodiment of the circular filter of the present invention, and FIG. 3 is an exploded perspective view of a camera optical system including the filter mounting frame of the present invention.
図３において、図中の従来例と同一機能部分の符号は同一符号を付してある。 カメラ光学系１は、カメラフロントパネル２と、センサ基板６に装着された固体撮像素子７と、前記カメラフロントパネル２と固体撮像素子７間に配設され３枚重装された光学フィルタ５を装着するフィルタ取付枠３と、防塵マスク８とで構成されている。 In FIG. 3, the same reference numerals are given to the same functional parts as those in the conventional example in the figure. The camera optical system 1 includes a camera front panel 2, a solid-state image sensor 7 mounted on a sensor substrate 6, and an optical filter 5 that is disposed between the camera front panel 2 and the solid-state image sensor 7 and that is three layers. The filter mounting frame 3 to be mounted and the dust mask 8 are configured.
カメラフロントパネル２には図示しない撮像レンズが装着され、該撮像レンズで撮像された被写体像は前記光学フィルタ５を介して固体撮像素子７の受光面に結像される。 An imaging lens (not shown) is attached to the camera front panel 2, and a subject image captured by the imaging lens is formed on the light receiving surface of the solid-state imaging device 7 through the optical filter 5.
図１において、前記光学フィルタ５をフィルタ取付枠３に穿設されたフィルタ用孔３”に挿入してフィルタ止め枠４に当接するよう装着し、必要に応じてその周囲を接着材等で貼着している。 In FIG. 1, the optical filter 5 is inserted into a filter hole 3 "formed in the filter mounting frame 3 so as to come into contact with the filter retaining frame 4, and the periphery thereof is adhered with an adhesive or the like as necessary. I wear it.
ここで、前記３枚の光学フィルタ５ａ、５ｂ、５ｃが重装された光学フィルタ５は、該光学フィルタ５の前記撮像レンズ側、又は固体撮像素子７側のいずれか一方、又は双方の表面が前記フィルタ取付枠３の光軸方向の表面と一致、又は１枚以下の厚みとなるように、例えば、最適値としては０．１５ｍｍ以上突出するように装着されている。 Here, the optical filter 5 on which the three optical filters 5a, 5b, and 5c are overlaid has either one or both surfaces of the optical filter 5 on the imaging lens side or the solid-state imaging device 7 side. For example, as an optimum value, the filter mounting frame 3 is mounted so as to protrude by 0.15 mm or more so as to coincide with the surface in the optical axis direction of the filter mounting frame 3 or to have a thickness of one or less.
また、前記３枚重装された図２（ａ）に示す四角形状光学フィルタ５又は図２（ｂ）に示す円形状光学フィルタ５が、該光学フィルタ５を構成する光学フィルタ５ａ、５ｂ、５ｃの少なくとも１枚（図１では２枚の光学フィルタ５ｂ、５ｃ）を残し、光学フィルタ５の前記撮像レンズ側、又は固体撮像素子７側のいずれか一方の１枚の撮像に支障ない四角形状の４隅端又は円形状の上下端、左右端のいずれか一方、又は両方の切除部９が平行に切除され、かつ該切除部９に合わせて前記フィルタ取付枠３開口部の枠材のフィルタ止め枠４が残され、前記光学フィルタ５ｂの切除されていない部分がフィルタ止め枠４に当接するように挿入されている。 Further, the three-layered rectangular optical filter 5 shown in FIG. 2A or the circular optical filter 5 shown in FIG. 2B is an optical filter 5 a, 5 b, 5 c constituting the optical filter 5. 1 (two optical filters 5b and 5c in FIG. 1) are left, and the optical filter 5 has a rectangular shape that does not hinder the imaging of either one of the imaging lens side or the solid-state imaging device 7 side. One of the four corner ends or the upper and lower ends of the circular shape, the left and right ends, or both cut portions 9 are cut in parallel, and the filter attachment of the frame member at the opening of the filter mounting frame 3 is matched to the cut portions 9 The frame 4 is left, and the optical filter 5b is inserted so that the uncut portion of the optical filter 5b contacts the filter retaining frame 4.
さらに、前記四角形状の４隅端又は円形状の４方端の切除部９が切除された光学フィルタ５ａの表面が前記フィルタ取付枠３の光軸方向の表面と一致、又は任意厚みだけ突出するように装着されたとき、前記光学フィルタ５ａと、フィルタ止め枠４の開口部間に隙間を生じていれば必要に応じて防塵のため樹脂材又は接着剤を充填することが好ましい。 Further, the surface of the optical filter 5a from which the cut-out portions 9 at the four corners of the square shape or the four ends of the circle are cut off coincides with the surface of the filter mounting frame 3 in the optical axis direction or protrudes by an arbitrary thickness. It is preferable to fill a resin material or an adhesive as necessary to prevent dust if a gap is generated between the optical filter 5a and the opening of the filter retaining frame 4 when mounted.
さらにまた、同様に前記光学フィルタ５ｂ、５ｃの切除されていない部分を前記フィルタ取付枠３のフィルタ用孔３”に挿入したとき、光学フィルタ５ｂ、５ｃの周囲を必要に応じて接着剤等で貼着することが好ましい。 Similarly, when the uncut portions of the optical filters 5b and 5c are inserted into the filter holes 3 '' of the filter mounting frame 3, the periphery of the optical filters 5b and 5c may be adhered with an adhesive or the like as necessary. It is preferable to stick.
前記カメラ光学系１を組み立てる際に、前記固体撮像素子７の撮像面側ガラス７ａ表面と、該撮像面側ガラス７ａ表面と相対する前記光学フィルタ５ｃ表面との間に弾力性材の防塵用マスク８を双方表面に密接させて装着すれば、撮像面側ガラス７ａ表面と光学フィルタ５ｃ表面間が密室状態になり、さらに防塵性に優れた光学系を構築することができる。 When the camera optical system 1 is assembled, a dustproof mask made of an elastic material is provided between the surface of the imaging surface side glass 7a of the solid-state imaging device 7 and the surface of the optical filter 5c facing the surface of the imaging surface side glass 7a. If 8 is attached in close contact with both surfaces, the surface between the imaging surface side glass 7a and the surface of the optical filter 5c is in a closed room state, and an optical system having excellent dust resistance can be constructed.
前記実施例において、前記光学フィルタ５の四角形状の４隅端又は円形状の４方端を切除する場合を記述したが、これに限定されることなく、前記光学フィルタ５の前記撮像レンズ側、又は固体撮像素子７側のいずれか一方の１枚又は任意枚数のみ撮像に支障ない四角形状の２〜４隅端又は円形状の２〜４方端のいずれかを切除することでもよい。 In the embodiment, the case where the four corners of the rectangular shape of the optical filter 5 or the four circular ends of the optical filter 5 are cut off has been described, but the present invention is not limited thereto, and the optical filter 5 side of the imaging lens, Alternatively, either one of the one on the solid-state imaging device 7 side or an arbitrary number of sheets may be cut out of either the rectangular 2 to 4 corner ends or the circular 2 to 4 direction ends that do not interfere with imaging.
また、上記実施例で前記複数枚重装された光学フィルタ５は３枚としたが、これに限定されることなく、２枚でもよく、さらに４枚以上重装してもよい。 In the above-described embodiment, the plurality of optical filters 5 that are stacked in a plurality of layers are three. However, the number of the optical filters 5 is not limited to two, and may be two or four or more.
前記実施例において、撮像素子として固体撮像素子７としたが、これに限定されることなく、その他の撮像素子で光学フィルタ５群を使用する場合に適用できることは言うまでもない。 In the above-described embodiment, the solid-state imaging device 7 is used as the imaging device.
本願発明において、固体撮像素子を使用した撮像装置では、水晶ローパスフィルタを使用した前記光学フィルタ群の装着が必然であり、カメラ光学系を組み立てる際の清掃が容易で、フィルタ面にゴミ等が残ることなく、作業性が著しく向上するのみでなく、顧客においても前記光学フィルタ群の清掃が容易となる。 In the present invention, in an imaging apparatus using a solid-state imaging device, the optical filter group using a crystal low-pass filter must be mounted, and cleaning when assembling a camera optical system is easy, and dust or the like remains on the filter surface. Accordingly, not only the workability is remarkably improved, but also the customer can easily clean the optical filter group.
１：カメラ光学系
２：フロントパネル
３、３’：フィルタ取付枠
３”：フィルタ用孔
４、４’：フィルタ止め枠
５、５ａ、５ｂ、５ｃ、５’：光学フィルタ
６：センサ基板
７：固体撮像素子
７ａ：撮像面側ガラス
８：防塵マスク
９：切除部
１０：段差
１１：当接面
1: Camera optical system 2: Front panel 3, 3 ′: Filter mounting frame 3 ″: Filter hole 4, 4 ′: Filter retaining frames 5, 5a, 5b, 5c, 5 ′: Optical filter 6: Sensor substrate 7: Solid-state imaging device 7a: Imaging surface side glass 8: Dust mask 9: Cut portion 10: Step 11: Contact surface
Claims (5)
前記複数枚重装された光学フィルタの、前記撮像レンズ側、又は撮像素子側のいずれか一方、又は双方の表面が、前記フィルタ取付枠の表面と一致して、前記フィルタ挿入孔に装着されてなることを特徴とする光学フィルタ取付構造。 In a television camera using an image sensor, a filter mounting frame having a square or circular optical filter inserted into an optical path between the image pickup lens and the image sensor and stacked in plural, and a filter insertion hole for mounting the optical filter With
The surface of either one or both of the imaging lens side or the imaging element side of the plurality of stacked optical filters coincides with the surface of the filter mounting frame and is mounted in the filter insertion hole. An optical filter mounting structure characterized by comprising:
前記複数枚重装された光学フィルタの、前記撮像レンズ側、又は撮像素子側のいずれか一方、又は双方の表面が、前記フィルタ取付枠の表面から突出して、前記フィルタ挿入孔に装着されてなることを特徴とする光学フィルタ取付構造。 In a television camera using an image sensor, a filter mounting frame having a square or circular optical filter inserted into an optical path between the image pickup lens and the image sensor and stacked in plural, and a filter insertion hole for mounting the optical filter With
The surface of one or both of the image pickup lens side and the image pickup element side of the multiple optical filters mounted in a plurality is projected from the surface of the filter mounting frame and is mounted in the filter insertion hole. An optical filter mounting structure characterized by that.
A dustproof mask made of an elastic material is mounted in close contact with both surfaces between the imaging surface side glass surface of the imaging element and the optical filter surface facing the imaging surface side glass surface. The optical filter mounting structure according to any one of claims 1 to 4.
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| JP2007120600A JP2008278287A (en) | 2007-05-01 | 2007-05-01 | Optical filter mounting structure |
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| JP2007120600A JP2008278287A (en) | 2007-05-01 | 2007-05-01 | Optical filter mounting structure |
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