JPS58108425U - Optical low-pass filter for color signal image sensor - Google Patents
Optical low-pass filter for color signal image sensorInfo
- Publication number
- JPS58108425U JPS58108425U JP326382U JP326382U JPS58108425U JP S58108425 U JPS58108425 U JP S58108425U JP 326382 U JP326382 U JP 326382U JP 326382 U JP326382 U JP 326382U JP S58108425 U JPS58108425 U JP S58108425U
- Authority
- JP
- Japan
- Prior art keywords
- optical
- image sensor
- color signal
- color
- pass filter
- 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.)
- Granted
Links
Landscapes
- Color Television Image Signal Generators (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は、偽信号の発生のようすを示す図で、第２図は
、光学ローパスフィルター及び撮像素子の光電変換部に
おける空間周波数に対するレスポンス特性を示し、第３
図は、光学ローパスフィルター素子の減衰極周波数及び
素子を変えた時の偽信号を示す図で、第４図ａ、 ｂ
は、従来の光学ローパスフィルターにおける光路を示す
図で、第５図は本考案の光学ローパスフィルターにおけ
る光路を示す図で、第６図ａ、 ｂは、本考案の一実
施例による光学ローパスフィルターの構成図及び光路図
で、第７図は第６図に示した光学ローパスフィルターを
用いた時の色信号周波数特性を示す図である。
図面において、１１は撮像素子の光電変換部における空
間周波数に対するレスポンス特性、１２゜１３は折り返
りによって生じる偽信号特性、２１は減衰極周波数３．
５８ＭＨｚの単一光学くし形フィルター素子の特性、２
２は撮像素子の光電変換部の特性、２３は減衰極周波数
３ 、５３ＭＨｚの光学ローパスフィルター素子を２素
子用いた時の特性、３１は減衰極周波数３．５８ＭＨｚ
の単一光学くし形フィルター素子−の偽信号１．３２は
減衰極 、３．５８ＭＨｚの光学くし形フィルター素
子を２素 −子用いた時の偽信号、３３は減衰極を
３．５８ＭＨｚ±０．２５ ＭＨｚとし、２素子用イタ
時の偽信号、３４は減衰極３゜５８ＭＨ２±０．５ＭＨ
ｚとし２素子用いた時の偽信号、３５は減衰極３．５８
ＭＨｚ±０．５ＭＨｚと３．５８ ＭＨｚとの４素子を
用いた時の偽信号、４１は光軸上の入射光、４２は常光
、４３は異常光、４４は光学くし形フィルター素子、４
５は出射光の中心、４６は入／４位相板、４７．４９は
常光、４８．５０は異常光ζ５１は光軸上の入射光、５
２は光学くし形フィルター素子、５３は入１４位相板、
５４．５６は異常光、５５．５７は常光、５８は出射光
の中心、６１．６３はλ１４位相板、６２．６４は光学
くし形フィルター素子、６５は常光と異常光の分離方向
と分離中を示し、６６は光軸上の入射光、６７は出射光
、６８は出射光の中心を示す。FIG. 1 is a diagram showing how false signals are generated, FIG. 2 is a diagram showing response characteristics to spatial frequencies in the optical low-pass filter and the photoelectric conversion section of the image sensor, and FIG.
The figure shows the attenuation pole frequency of the optical low-pass filter element and the false signal when changing the element.
5 is a diagram showing an optical path in a conventional optical low-pass filter, FIG. 5 is a diagram showing an optical path in an optical low-pass filter of the present invention, and FIGS. In the configuration diagram and optical path diagram, FIG. 7 is a diagram showing color signal frequency characteristics when the optical low-pass filter shown in FIG. 6 is used. In the drawing, reference numeral 11 indicates a response characteristic to the spatial frequency in the photoelectric conversion section of the image sensor, reference numeral 12 and 13 indicate a false signal characteristic caused by folding, and reference numeral 21 indicates an attenuation pole frequency 3.
Characteristics of a 58 MHz single optical comb filter element, 2
2 is the characteristic of the photoelectric conversion part of the image sensor, 23 is the characteristic when two optical low-pass filter elements of attenuation pole frequency 3 and 53 MHz are used, and 31 is the attenuation pole frequency 3.58 MHz.
The false signal 1.32 is the attenuation pole of a single optical comb filter element, and the false signal 33 is the attenuation pole when two 3.58 MHz optical comb filter elements are used. .25 MHz, false signal when iterating for two elements, 34 is attenuation pole 3゜58MH2±0.5MH
False signal when using z and 2 elements, 35 is attenuation pole 3.58
False signal when using four elements of MHz ± 0.5 MHz and 3.58 MHz, 41 is incident light on the optical axis, 42 is ordinary light, 43 is extraordinary light, 44 is optical comb filter element, 4
5 is the center of the emitted light, 46 is the input/4 phase plate, 47.49 is the ordinary light, 48.50 is the extraordinary light, ζ51 is the incident light on the optical axis, 5
2 is an optical comb filter element, 53 is a 14-phase phase plate,
54.56 is the extraordinary light, 55.57 is the ordinary light, 58 is the center of the emitted light, 61.63 is the λ14 phase plate, 62.64 is the optical comb filter element, 65 is the direction of separation of the ordinary light and the extraordinary light, and the separation process. , 66 is the incident light on the optical axis, 67 is the outgoing light, and 68 is the center of the outgoing light.
Claims (1)
いて少なくとも青、赤の２信号成分を１つの色信号用撮
像素子よりをり出し、他の１つ以上の撮像素子から広帯
域な緑信号あるいは輝度信号を取り出すようになされた
カラーカメラにおける色信号用撮像素子の入射光路に挿
入する色信号用光学ローパスフィルターにおいて、光学
的−軸性複屈折特性を備えた透明物質に、よって構成さ
れ、かつ複屈折による常光と異常光の分離方向が水平走
査方向であり、さらに常光と異常光の分離干渉によって
生じる空間周波数の基本減衰極が前記色信号用撮像素子
の色信号空間サンプリング周波数の±０．５ＭＨ’ｚ以
内である光学くし形フィルタ素子を光学的−軸性複屈折
特性を備えた透明物質による入１４位相板を介して偶数
素子設けるとともに、前記偶数素子の半数の素子の常光
と異常光の分離方向が水平走査方向でかつ互いに１８０
°異なるように設けられていることを特徴とする色信号
撮像素子用光学ローパスフィルター。Using a striped or dot-shaped color separation filter, at least two signal components, blue and red, are extracted from one color signal image sensor, and a broadband green signal or luminance signal is extracted from one or more other image sensors. An optical low-pass filter for color signals that is inserted into the incident optical path of a color signal image sensor in a color camera, which is configured to be taken out, is made of a transparent material with optical-axial birefringence characteristics, and The separation direction of the ordinary light and the extraordinary light is the horizontal scanning direction, and furthermore, the fundamental attenuation pole of the spatial frequency caused by the separation interference of the ordinary light and the extraordinary light is ±0.5 MHz of the color signal spatial sampling frequency of the color signal image sensor. An even number of optical comb filter elements is provided through a 14 phase plate made of a transparent material having optical-axial birefringence characteristics, and the separation direction of ordinary light and extraordinary light of half of the even number of elements is set. are in the horizontal scanning direction and 180 degrees apart from each other
An optical low-pass filter for a color signal image sensor, characterized in that the optical low-pass filters are provided differently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP326382U JPS58108425U (en) | 1982-01-14 | 1982-01-14 | Optical low-pass filter for color signal image sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP326382U JPS58108425U (en) | 1982-01-14 | 1982-01-14 | Optical low-pass filter for color signal image sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58108425U true JPS58108425U (en) | 1983-07-23 |
| JPS6131294Y2 JPS6131294Y2 (en) | 1986-09-11 |
Family
ID=30016204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP326382U Granted JPS58108425U (en) | 1982-01-14 | 1982-01-14 | Optical low-pass filter for color signal image sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58108425U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006243277A (en) * | 2005-03-02 | 2006-09-14 | Fujinon Corp | Color separation optical system |
-
1982
- 1982-01-14 JP JP326382U patent/JPS58108425U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006243277A (en) * | 2005-03-02 | 2006-09-14 | Fujinon Corp | Color separation optical system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6131294Y2 (en) | 1986-09-11 |
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