JPS63307423A - Image pickup element with optical low-pass effect - Google Patents
Image pickup element with optical low-pass effectInfo
- Publication number
- JPS63307423A JPS63307423A JP62143895A JP14389587A JPS63307423A JP S63307423 A JPS63307423 A JP S63307423A JP 62143895 A JP62143895 A JP 62143895A JP 14389587 A JP14389587 A JP 14389587A JP S63307423 A JPS63307423 A JP S63307423A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- low
- optical low
- pass
- light receiving
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 230000000694 effects Effects 0.000 title claims abstract description 25
- 238000003384 imaging method Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 235000019646 color tone Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Landscapes
- Color Television Image Signal Generators (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は光学的ローパス効果を有した撮像素子に関し、
特にビデオカメラ、電子スチルカメラ等で撮像管や撮像
板等の撮像素子を用いて画像を離散的に得る際に好適な
光学的ローパス効果を有した撮像素子に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image sensor having an optical low-pass effect.
In particular, the present invention relates to an image sensor having an optical low-pass effect suitable for obtaining images discretely using an image sensor such as an image pickup tube or an image pickup plate in a video camera, an electronic still camera, or the like.
（従来の技術）
一般に離散的画素構造を有する固体撮像素子を用いたビ
デオカメラ等では画像情報を光学的に空間サンプリング
して出力画像を得ている。(Prior Art) Generally, in a video camera or the like using a solid-state image sensor having a discrete pixel structure, image information is spatially sampled optically to obtain an output image.
この場合被写体にサンプリング周波数以上の高空間周波
数成分が含まれていると被写体が有していない構造や色
あい等の特に偽色信号が多く発生してくる。即ち撮影機
によって採取することのできない周波数成分（ナイキス
ト周波数を越える周波数成分）は画像情報として再現す
ることができず、所謂波形歪み（エイリアシス）、モア
レ縞、偽色等が形成させる原因となってくる。In this case, if the object contains a high spatial frequency component higher than the sampling frequency, many false color signals will occur, especially due to structures and color tones that the object does not have. In other words, frequency components that cannot be collected by a camera (frequency components that exceed the Nyquist frequency) cannot be reproduced as image information, causing so-called waveform distortion (aliases), moiré fringes, false colors, etc. come.
この為、従来より光学的ローパスフィルターを撮影系の
一部に配置して被写体の高空間周波数成分を制限してい
る。光学的ローパスフィルターとしては水晶板等の複屈
折を利用したものが多く用いられている。For this reason, conventionally, an optical low-pass filter is placed in a part of the photographing system to limit high spatial frequency components of the subject. Many optical low-pass filters that utilize birefringence, such as quartz plates, are used.
第４図は従来の水晶板を用い複屈折を利用した光学的ロ
ーパスフィルターを撮影系の一部に設けた光学系の説明
図である。FIG. 4 is an explanatory diagram of an optical system in which a conventional optical low-pass filter using a crystal plate and utilizing birefringence is provided as a part of the photographing system.
同図において４４は撮像レンズ、４８は撮像素子でカラ
ーフィルタ付のＣＯＤ等から成る受光部４２とカバーガ
ラス４７を有している。４５は赤外光カットフィルター
、４６は水晶板より成る光学的ローパスフィルターで赤
外光カットフィルター４５と一体的に構成されている。In the figure, 44 is an imaging lens, and 48 is an imaging device, which has a light receiving section 42 made of a COD or the like with a color filter, and a cover glass 47. 45 is an infrared light cut filter, and 46 is an optical low pass filter made of a crystal plate, which is integrally constructed with the infrared light cut filter 45.
光学的ローパスフィルター４６は入射光束を常光線と異
常光線の２つの光束に分離することによりローパス効果
を得ている。The optical low-pass filter 46 obtains a low-pass effect by separating the incident light beam into two light beams, an ordinary ray and an extraordinary ray.
一般に水晶板は価格が高く、入射光束を一定量分離する
にはある程度厚くしなければならない等の問題があった
。In general, quartz crystal plates are expensive and have problems such as having to be thick to a certain extent in order to separate a certain amount of incident light flux.
これに対して特開昭４９−２０１０５号公報では位相型
の回折格子を利用した薄型の光学部材より成る光学的ロ
ーパスフィルターを提案している。同公報では回折効果
を利用して入射光束を２方向に分離して水晶板と同様に
ローパス効果を得ている。On the other hand, Japanese Patent Application Laid-Open No. 49-20105 proposes an optical low-pass filter made of a thin optical member using a phase-type diffraction grating. In this publication, the diffraction effect is used to separate the incident light beam into two directions to obtain a low-pass effect similar to a quartz plate.
しかしながらこの光学的ローパスフィルターは回折像の
拡がり分だけ画質が低下し、ローパス効果を得ると同時
に低周領域の画質も低下させてしまう傾向があった。However, with this optical low-pass filter, the image quality deteriorates by the amount of spread of the diffraction image, and at the same time as obtaining the low-pass effect, there is a tendency that the image quality in the low frequency region also deteriorates.
この他、従来は光学的ローパスフィルターを撮影系中若
しくは撮影系の後方に配置していた為に機構上及び光学
構成上装置全体が複雑化してくる傾向があった。In addition, conventionally, an optical low-pass filter has been placed in the photographing system or behind the photographing system, which tends to make the entire apparatus complicated in terms of mechanism and optical configuration.
（発明が解決しようとする問題点）
本発明は光学的ローパスフィルターを必要とするビデオ
カメラ等の撮影系においてローパス効果を有するローパ
ス部材と受光部とを適切な関係で配置することにより撮
影系全体の簡素化を図ることが出来、かつローパス効果
を効果的に発揮することができ、更に組立作業性の向上
を図ることのできる光学的ローパス効果を有した撮像素
子の提供を目的とする。(Problems to be Solved by the Invention) The present invention solves the problem by arranging a low-pass member having a low-pass effect and a light receiving section in an appropriate relationship in a photographing system such as a video camera that requires an optical low-pass filter. An object of the present invention is to provide an image sensor having an optical low-pass effect, which can simplify the process, effectively exhibit the low-pass effect, and improve assembly workability.
（問題点を解決するための手段）
ローパス効果を有する位相型の回折格子から成るローパ
ス部材を受光部の入射面側に該受光部と一体的に構成し
たことをである。(Means for Solving the Problems) A low-pass member made of a phase-type diffraction grating having a low-pass effect is integrally formed with the light-receiving section on the incident surface side of the light-receiving section.
又、本発明では前記ローパス部材の少なくとも１つの面
を赤外光カット処理をし、効率的に不要な赤外光を除去
している。Further, in the present invention, at least one surface of the low-pass member is subjected to infrared light cutting treatment to efficiently remove unnecessary infrared light.
（実施例）
第１図は本発明に係る光学的ローパス効果を存した撮像
素子を撮影系の一部に設けた一実施例の概略図である。(Embodiment) FIG. 1 is a schematic diagram of an embodiment in which an image sensor having an optical low-pass effect according to the present invention is provided as a part of a photographing system.
同図において４は撮像レンズ、３は光学的ローパス効果
を有した撮像素子であり、ローパス効果を有するローパ
ス部材である位相型の回折格子から成る光学的ローパス
フィルター１とカラーフィルター付のＣＯＤ等の受光部
２とを有している。In the figure, 4 is an imaging lens, 3 is an image sensor having an optical low-pass effect, an optical low-pass filter 1 consisting of a phase-type diffraction grating, which is a low-pass member having a low-pass effect, and a COD with a color filter, etc. It has a light receiving section 2.
本実施例においては光学的ローパスフィルター１と受光
部２は一体的に構成されている。In this embodiment, the optical low-pass filter 1 and the light receiving section 2 are integrally constructed.
−第２図は第１図の撮像素子３の要部を拡大した説明図
である。光学的ローパスフィルター１は片面に微細な３
角形状のプリズムを複数個規則的に配置した構造より成
っている。- FIG. 2 is an enlarged explanatory diagram of a main part of the image sensor 3 shown in FIG. 1. The optical low-pass filter 1 has a fine 3 on one side.
It consists of a structure in which a plurality of rectangular prisms are regularly arranged.
尚、本実施例においては位相型の回折格子であれば３角
形状の他に４角形状や台形状のプリズムであっても良い
。In this embodiment, as long as the phase-type diffraction grating is used, a prism having a rectangular or trapezoidal shape may be used instead of a triangular shape.
カラーフィルター付の受光部２はピッチＰ３で配置され
た複数のカラーフィルターＲ，Ｇ、Ｂより成るカラーフ
ィルタ一群２Ａと受光素子２Ｂを有している。カラーフ
ィルタ一群２ＡのうちＲは赤色、Ｇは緑色、Ｂは青色の
カラーフィルターを示している。受光素子２Ｂはカラー
フィルタ一群２Ａの各カラーフィルターに対応した受光
画素から得られた信号より各々Ｒ，Ｇ、Ｂを判断して色
分離を行っている。The light receiving section 2 with a color filter has a color filter group 2A consisting of a plurality of color filters R, G, and B arranged at a pitch P3, and a light receiving element 2B. In the color filter group 2A, R indicates a red color filter, G indicates a green color filter, and B indicates a blue color filter. The light receiving element 2B performs color separation by determining R, G, and B from signals obtained from light receiving pixels corresponding to each color filter of the color filter group 2A.
光学的ローパスフィルター１は入射光束２１を予め設定
した値となるように２つの光束２２゜２３に分離してカ
ラーフィルタ一群２Ａを介して受光素子２Ｂに入射させ
ている。The optical low-pass filter 1 separates the incident light beam 21 into two light beams 22.degree. 23 so as to have a preset value, and makes them incident on the light receiving element 2B via a group of color filters 2A.
これによりローパス効果を得てカラーフィルターＲ，Ｇ
、Ｂの配列と同ピツチＰ３の空間周波数の被写体画像が
解像されないようにして被写体画像がカラーフィルター
Ｒ，Ｇ、Ｂの配列と同ピツチＰ３のときに着色してくる
偽色信号の発生を防止している。As a result, a low-pass effect is obtained and the color filters R and G
, B, and the spatial frequency of the same pitch P3 as the array of color filters R, G, and B are prevented from being resolved, thereby preventing the generation of false color signals that are colored when the subject image is of the same pitch P3 as the array of color filters R, G, and B. It is prevented.
第３図は第２図に示す光学的ローパスフィルター１の光
束の分離に関する説明図である。光学的ローパスフィル
ター１はピッチＰＩ、プリズム角θ２の３角形状の回折
格子３０より成り、入射光束３１を回折させて２光束３
２．３３に分離してカラーフィルター面３４上にピッチ
Ｐ２となるように導光している。このときプリズム角θ
２を適切に設定し微細プリズムにより入射光束を屈折さ
せ１次回折像若しくは２次回折像を強調して出射するよ
うにして高次回折像の強度を低下させて効果的に光束分
離を行っている。FIG. 3 is an explanatory diagram regarding the separation of light beams by the optical low-pass filter 1 shown in FIG. 2. The optical low-pass filter 1 consists of a triangular diffraction grating 30 with a pitch PI and a prism angle θ2, and diffracts an incident light beam 31 into two light beams 3.
The light is separated into 2.33 parts and guided onto the color filter surface 34 at a pitch of P2. At this time, the prism angle θ
2 is appropriately set, the incident light beam is refracted by a fine prism, and the first-order diffraction image or the second-order diffraction image is emphasized and emitted, thereby reducing the intensity of the higher-order diffraction image and effectively separating the light beam. There is.
本実施例では１次回折像の方向とプリズムによる屈折光
の方向とが略一致するように回折格子３０の形状及びピ
ッチ等を設定している。In this embodiment, the shape, pitch, etc. of the diffraction grating 30 are set so that the direction of the first-order diffraction image and the direction of the refracted light by the prism substantially match.
今、同図に示すように光束３２．３３の屈折角を０１、
回折格子３０の屈折率をｎ、光学的ローパスフィルター
１から受光部２までの距離なり、カラーフィルター面３
４上の２光束のピッチを２２とすると回折格子３０のプ
リズム角θ２はθ＋＝（ｎ−ｔ）θ２ ＝Ｐ２ ／ Ｄ
より
θ２ ＝Ｐ２ ／（（ｎ−１）叫 −（１）となる。Now, as shown in the same figure, the refraction angle of the luminous flux 32.33 is 01,
The refractive index of the diffraction grating 30 is n, the distance from the optical low-pass filter 1 to the light receiving section 2 is the color filter surface 3
If the pitch of the two light beams on 4 is 22, the prism angle θ2 of the diffraction grating 30 is θ+=(nt)θ2 =P2/D
Therefore, θ2 = P2 / ((n-1) - (1).
光学的ローパスフィルターの材質として屈折率ｎ ＝
１．４９２のアクリルを使用し、受光部の受光画素とし
て水平方向で７８０画素を想定し、受光部の画面寸法を
％インチとするとカラーフィルターのピッチＰ３は０．
０３３８ｍｍとなる。従って２光束の分離ピッチＰ２は
Ｐ ２ ＝ ０．０１６９ｍ膿となる。これよりプリズ
ム角θ２はθ、 ＝０．０３４４／Ｄ （ラジアン）と
なる。As the material of the optical low-pass filter, the refractive index n =
If 1.492 acrylic is used, the light receiving pixels of the light receiving section are assumed to be 780 pixels in the horizontal direction, and the screen size of the light receiving section is % inches, the pitch P3 of the color filter is 0.
It becomes 0338mm. Therefore, the separation pitch P2 of the two light beams is P2=0.0169m. From this, the prism angle θ2 becomes θ, =0.0344/D (radian).
一般に光学的ローパスフィルターな撮像系中若しくは撮
像系の直後に配置した場合には距ｒＩＩＩＤは１０ｍ−
以上となるのでプリズム角θ２は１０分程度となる。こ
のような小さなプリズム角を有する光学的ローパスフィ
ルターを精度良く製作するのは一般に大変困難である。Generally, when an optical low-pass filter is placed in the imaging system or immediately after the imaging system, the distance rIIID is 10 m-
Therefore, the prism angle θ2 is about 10 minutes. Generally, it is very difficult to manufacture an optical low-pass filter having such a small prism angle with high precision.
これに対して本発明によれば受光部と光学的ローパスフ
ィルターな撮像素子として一体的に構成しているので距
離りを極めて短くすることができる。従ってプリズム角
θ２を比較的大きく設定することができるので製作が容
易となり高精度な光学的ローパスフィルターを容易に得
ることができる。On the other hand, according to the present invention, since the light receiving section and the optical low-pass filter image pickup element are integrally constructed, the distance can be extremely shortened. Therefore, since the prism angle θ2 can be set relatively large, manufacturing becomes easy and a highly accurate optical low-pass filter can be easily obtained.
又（１）式から明らかなように光学的ローパスフィルタ
ーと受光部との間隔りに誤差が生ずると受光面上での光
束の分離幅が変化してくる。この為ローパス効果が低下
したり、光学的ローパスフィルターと受光部とが別体の
場合には撮影レンズのピント調整の為、受光部を移動さ
せたりしなければならず最適な使用状態を維持するのが
難しくなってくる。Furthermore, as is clear from equation (1), if an error occurs in the distance between the optical low-pass filter and the light receiving section, the separation width of the light beam on the light receiving surface changes. For this reason, the low-pass effect may deteriorate, or if the optical low-pass filter and the light receiving section are separate, the light receiving section must be moved to adjust the focus of the photographic lens, thus maintaining optimal usage conditions. It's getting difficult.
これに対して本発明では光学的ローパスフィルターと受
光部とを一体的に構成しているのでピント調整を行フて
も光学的ローパスフィルターと受光部との間隔を常にＩ
＆適な状態に維持することができる特長を有している。In contrast, in the present invention, the optical low-pass filter and the light-receiving section are integrally configured, so even when the focus is adjusted, the distance between the optical low-pass filter and the light-receiving section is always maintained at I.
& It has the feature of being able to be maintained in an appropriate condition.
又、光学的ローパスフィルターと受光部とを別体に構成
した場合、カラーフィルターの配列方向と光学的ローパ
スフィルターによる回折方向とがずれやすくなるが本発
明では光学的ローパスフィルターと受光部とを一体に構
成しているのでこのようなずれは生じにくい等の特長を
有している。Furthermore, if the optical low-pass filter and the light-receiving section are configured separately, the arrangement direction of the color filters and the diffraction direction by the optical low-pass filter are likely to be misaligned, but in the present invention, the optical low-pass filter and the light-receiving section are integrated. It has the advantage that such misalignment is unlikely to occur because of the structure.
この低木実施例では光学的ローパス効果を有するローパ
ス部材の一面に赤外光カット用の蒸着膜を施すことによ
り新たに赤外光カットフィルターを設けることを不必要
とし光学系全体の簡素化を図っている。In this shrub example, a vapor-deposited film for cutting infrared light is applied to one surface of a low-pass member that has an optical low-pass effect, thereby making it unnecessary to newly provide an infrared light cut filter and simplifying the entire optical system. ing.
（発明の効果）
本発明によれば位相型の回折格子から成る光学的ローパ
スフィルターと受光部とを一体的にパッケージし、撮像
素子を構成することにより常に最適配置状態でローパス
効果を発揮させることのできる撮像素子を達成すること
ができる。(Effects of the Invention) According to the present invention, an optical low-pass filter consisting of a phase-type diffraction grating and a light receiving section are integrally packaged to constitute an image sensor, thereby always exhibiting a low-pass effect in an optimal arrangement state. It is possible to achieve an image sensor capable of
又、光学的ローパスフィルターと受光部との間隔の調整
及びカラーフィルターの配列方向と光学的ローパスフィ
ルターの配列方向、即ち回折方向との調整を不要とした
組立：Ｉｌ整がしやすく作業性向上を図った光学的ロー
パス効果を有した撮像素子を達成することができる。In addition, the assembly eliminates the need to adjust the distance between the optical low-pass filter and the light-receiving section and the alignment direction of the color filter and the alignment direction of the optical low-pass filter, that is, the diffraction direction: easy alignment and improved workability. An image sensor having the desired optical low-pass effect can be achieved.
更にローパス部材の一面に赤外光カット用の蒸着膜を施
すことにより、新たに赤外光カットフィルターを設ける
必要がなく光学系全体の簡素化を図ることが出来る等の
特長を有している。Furthermore, by applying a vapor-deposited film to cut infrared light on one side of the low-pass member, there is no need to install a new infrared light cut filter, making it possible to simplify the entire optical system. .
第１図は本発明の光学的ローパス効果を有した撮像素子
を撮影系の一部に設けた一実施例の概略図、第２図は第
１図の撮像素子の要部拡大図、第３図は第２図の光学的
ローパスフィルターによる光束の分離状態を示す説明図
、第４図は従来の光学的ローパスフィルターを備えた撮
影系の説明図である。
図中、１は光学的ローパスフィルター、２は受光部、３
は撮像素子、４は撮像レンズ、２Ａはカラーフィルタ一
群、２Ｂは受光素子、２１は入射光束、２２．２３は分
離光束である。
特許出願人 キャノン株式会社
第 １ 図
稟２図FIG. 1 is a schematic diagram of an embodiment in which an image sensor having an optical low-pass effect according to the present invention is provided as a part of an imaging system, FIG. 2 is an enlarged view of the main part of the image sensor shown in FIG. This figure is an explanatory diagram showing the state of separation of light beams by the optical low-pass filter of FIG. 2, and FIG. 4 is an explanatory diagram of a photographing system equipped with a conventional optical low-pass filter. In the figure, 1 is an optical low-pass filter, 2 is a light receiving section, and 3
2 is an image pickup element, 4 is an image pickup lens, 2A is a group of color filters, 2B is a light receiving element, 21 is an incident light beam, and 22.23 is a separated light beam. Patent applicant Canon Co., Ltd. Figure 1 Figure 2
Claims (2)
ローパス部材を受光部の入射面側に該受光部と一体的に
構成したことを特徴とする光学的ローパス効果を有する
撮像素子。(1) An imaging device having an optical low-pass effect, characterized in that a low-pass member made of a phase-type diffraction grating having a low-pass effect is integrally formed with the light-receiving portion on the incident surface side of the light-receiving portion.
カット処理が施されていることを特徴とする特許請求の
範囲第１項記載の光学的ローパス効果を有する撮像素子
。(2) An imaging device having an optical low-pass effect according to claim 1, wherein at least one surface of the low-pass member is subjected to an infrared light cutting process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62143895A JPS63307423A (en) | 1987-06-09 | 1987-06-09 | Image pickup element with optical low-pass effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62143895A JPS63307423A (en) | 1987-06-09 | 1987-06-09 | Image pickup element with optical low-pass effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63307423A true JPS63307423A (en) | 1988-12-15 |
Family
ID=15349546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62143895A Pending JPS63307423A (en) | 1987-06-09 | 1987-06-09 | Image pickup element with optical low-pass effect |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63307423A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03120986A (en) * | 1989-10-03 | 1991-05-23 | Kuraray Co Ltd | Image pickup device |
| JPH0447769A (en) * | 1990-06-14 | 1992-02-17 | Fuji Photo Film Co Ltd | Image pickup device |
| JPH0420769U (en) * | 1990-06-11 | 1992-02-21 | ||
| JPH0420767U (en) * | 1990-06-11 | 1992-02-21 | ||
| JPH04110903A (en) * | 1990-08-31 | 1992-04-13 | Hoya Corp | Optical filter, solid state image pickup element having this optical filter and production of this optical filter |
| JPH0513818U (en) * | 1991-08-06 | 1993-02-23 | 日産自動車株式会社 | Sun roof car heads lining mounting structure |
| US5461418A (en) * | 1990-07-26 | 1995-10-24 | Canon Kabushiki Kaisha | Color image pickup apparatus provided with a diffraction type low-pass filter |
-
1987
- 1987-06-09 JP JP62143895A patent/JPS63307423A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03120986A (en) * | 1989-10-03 | 1991-05-23 | Kuraray Co Ltd | Image pickup device |
| JPH0420769U (en) * | 1990-06-11 | 1992-02-21 | ||
| JPH0420767U (en) * | 1990-06-11 | 1992-02-21 | ||
| JPH0447769A (en) * | 1990-06-14 | 1992-02-17 | Fuji Photo Film Co Ltd | Image pickup device |
| US5461418A (en) * | 1990-07-26 | 1995-10-24 | Canon Kabushiki Kaisha | Color image pickup apparatus provided with a diffraction type low-pass filter |
| JPH04110903A (en) * | 1990-08-31 | 1992-04-13 | Hoya Corp | Optical filter, solid state image pickup element having this optical filter and production of this optical filter |
| JPH0513818U (en) * | 1991-08-06 | 1993-02-23 | 日産自動車株式会社 | Sun roof car heads lining mounting structure |
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