JPH0248801Y2 - - Google Patents
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- Publication number
- JPH0248801Y2 JPH0248801Y2 JP289984U JP289984U JPH0248801Y2 JP H0248801 Y2 JPH0248801 Y2 JP H0248801Y2 JP 289984 U JP289984 U JP 289984U JP 289984 U JP289984 U JP 289984U JP H0248801 Y2 JPH0248801 Y2 JP H0248801Y2
- Authority
- JP
- Japan
- Prior art keywords
- filter
- optical system
- white balance
- signal
- light
- 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.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims description 36
- 238000003384 imaging method Methods 0.000 claims description 34
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002834 transmittance Methods 0.000 description 9
- 230000003595 spectral effect Effects 0.000 description 8
- 230000004907 flux Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229940007424 antimony trisulfide Drugs 0.000 description 1
- NVWBARWTDVQPJD-UHFFFAOYSA-N antimony(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[Sb+3].[Sb+3] NVWBARWTDVQPJD-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Landscapes
- Blocking Light For Cameras (AREA)
- Structure And Mechanism Of Cameras (AREA)
- Color Television Image Signal Generators (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は撮像装置に係り、特に単管式或いは単
板式などの単一の撮像素子を備えたカラーテレビ
ジヨンカメラにおいて、開口絞りの口径値に依存
する白バランス変動を補正するための撮像装置に
関する。[Detailed description of the invention] (Field of industrial application) The present invention relates to an imaging device, and in particular, to a color television camera equipped with a single imaging element such as a single-tube type or a single-plate type, the aperture value of the aperture diaphragm is The present invention relates to an imaging device for correcting white balance fluctuations that depend on .
（従来技術）
一般に、ストライプフイルタ（色分離用カラー
フイルタ）を内蔵した単一の撮像管（撮像素子）
を用いたカラーテレビジヨンカメラ（以下、TV
カメラと言う）では、開口絞り（レンズ絞り）の
Ｆ値によつて出力信号の白バランスが変化するこ
とは良く知られていることである。(Prior art) Generally, a single image pickup tube (imaging device) with a built-in stripe filter (color filter for color separation)
A color television camera (hereinafter referred to as TV
It is well known that the white balance of the output signal of a camera (referred to as a camera) changes depending on the F value of the aperture diaphragm (lens diaphragm).
上記撮像管ターゲツトは、例えば第１図に示す
如く、フエースガラス１上にストライプフイルタ
２が設けられ、このストライプフイルタ２の表面
には接着剤３で薄板ガラス４を接着し、これを透
明電極膜５形成用の基板とし、その上に三硫化ア
ンチモンなどの光導電膜６が蒸着された構成とな
つている。そして、上記ストライプフイルタ２
を、例えば第２図に示す如く黄色光透過部分Ye
と白色光透過部分Ｗとが所定方向に交互に所定の
ピツチで形成された第１の短冊状フイルタ部と、
シアン光透過部分Cyと白色光透過部分W′とが、
第１の短冊状フイルタ部と交差する方向に交互に
所定のピツチで形成された第２の短冊状フイルタ
部とより構成した場合は、撮像管の出力信号はｎ
−１の走査線では緑色信号Ｇ、赤色信号Ｒ、青色
信号Ｂの３つの和信号である低域信号と、赤色信
号Ｒと青色信号Ｂとの差信号で変調された搬送波
信号が得られる。上記信号より低域フイルタによ
り輝度信号成分（Ｙ成分）を、また帯域フイルタ
によつて変調信号成分を分離し、1H遅延、90゜移
相および加減算処理により、赤色信号Ｒと青色信
号Ｂとが復調される方式は周知のことである。 In the image pickup tube target, as shown in FIG. 1, for example, a stripe filter 2 is provided on a face glass 1, a thin plate glass 4 is adhered to the surface of the stripe filter 2 with an adhesive 3, and a transparent electrode film is attached to the stripe filter 2. 5, and a photoconductive film 6 made of antimony trisulfide or the like is deposited thereon. And the above stripe filter 2
For example, as shown in Fig. 2, the yellow light transmitting part Ye
and white light transmitting portions W are formed alternately at a predetermined pitch in a predetermined direction;
The cyan light transmitting portion Cy and the white light transmitting portion W′ are
When the first strip-shaped filter section and the second strip-shaped filter section are formed alternately at a predetermined pitch in a direction crossing the first strip-shaped filter section, the output signal of the image pickup tube is n.
In the −1 scanning line, a low-frequency signal that is a sum signal of the green signal G, red signal R, and blue signal B, and a carrier wave signal modulated by the difference signal between the red signal R and the blue signal B are obtained. From the above signal, the luminance signal component (Y component) is separated by a low-pass filter, and the modulation signal component is separated by a bandpass filter, and red signal R and blue signal B are separated by 1H delay, 90° phase shift, and addition/subtraction processing. The demodulation method is well known.
しかしながら、上記の撮像管では光導電膜６上
へのストライプフイルタ２の投影像の鮮鋭度はＦ
値を小さくするほど損われてくるため、薄板ガラ
ス４と接着剤３との和の差が、30μｍと一定の場
合、例えば第３図に示す如く、Ｆ値が小さくなる
ほど上記変調波の変調度が低下し、このためＦ値
によつて白バランスが変化してしまう。 However, in the above image pickup tube, the sharpness of the image projected by the stripe filter 2 onto the photoconductive film 6 is F.
The smaller the value, the more it will be damaged, so if the difference in the sum of the thin glass 4 and the adhesive 3 is constant at 30 μm, the modulation degree of the modulated wave will decrease as the F value decreases, for example, as shown in FIG. Therefore, the white balance changes depending on the F value.
また、上記撮像管を用いたTVカメラにあつて
は、ストライプフイルタ２を透過した光束を光電
変換して、この出力信号を電気的に演算すること
により色を検出しているが、このストライプフイ
ルタ２と光導電膜６（光電変換面）とは製造上の
制限から、一般的にはある距離を隔てて配置され
ているのが常である。従つて、光導電膜６に入来
する光束の状態が、撮像光学系の状態の変化、即
ち、開口絞り径・焦点距離・射出瞳位置などによ
つて変動を受けることにより、ストライプフイル
タ２を透過して光導電膜６に至る光束の分布状態
に変動が生じ、この変動により白バランスがズレ
て正しい色再現ができないという問題が発生して
いる。 In addition, in the case of a TV camera using the above-mentioned image pickup tube, color is detected by photoelectrically converting the light flux transmitted through the stripe filter 2 and electrically calculating this output signal. 2 and the photoconductive film 6 (photoelectric conversion surface) are generally placed apart from each other by a certain distance due to manufacturing restrictions. Therefore, the state of the light flux entering the photoconductive film 6 changes due to changes in the state of the imaging optical system, that is, the aperture diameter, focal length, exit pupil position, etc. A problem arises in that the distribution of the light beam that passes through the photoconductive film 6 changes, and that the white balance shifts due to this change, making it impossible to reproduce colors correctly.
第４図に示すようなテレセントリツク光学系お
いては、被写体側に位置する変倍光学系Ａと、例
えば撮像管などの撮像素子Ｃ側に位置する結像光
学系Ｂとの間に、この結像光学系Ｂの焦点位置近
傍に開口絞りＤを配置して、撮像素子Ｃの撮像面
へ入射する軸外光束の主光線Ｅを垂直に入射する
ようにしたものであるが、これは各像高へ入射す
る光束の主光線Ｅのみに制限を与えたものであ
り、この主光線Ｅを取り巻くマージナル光線（主
光線の周辺の光線）E′については何等制限がない
ため、開口絞りＤの開口径の変動や変倍光学系Ａ
の口径触の影響を免れることができない欠点があ
る。 In a telecentric optical system as shown in Fig. 4, there is a variable power optical system A located on the subject side and an imaging optical system B located on the imaging element C side such as an image pickup tube. An aperture stop D is arranged near the focal position of the imaging optical system B, so that the principal ray E of the off-axis beam incident on the imaging surface of the imaging device C is incident perpendicularly. This limits only the principal ray E of the luminous flux incident on the image height, and there is no limit on the marginal rays (rays around the principal ray) E' surrounding this principal ray E, so the aperture stop D Variation of aperture diameter and variable magnification optical system A
It has the disadvantage that it cannot escape the influence of blaming.
一方、開口絞りの開口径の変動による白バラン
スを補正するための一手段としての電気的補正法
にあつては、ホール素子などによつて直接開口絞
り値（Ｆ値）を検出し、これにより電気的に白バ
ランスを補正するようにしたものがあるが、これ
は高価なホール素子を使用するために、構成部品
が増加すると共に、電気回路が複雑となつてTV
カメラの総コストが高くなり、且つTVカメラの
重量が増加するなど好ましいものではない。 On the other hand, in the electrical correction method as a means of correcting white balance due to variations in the aperture diameter of the aperture diaphragm, the aperture diaphragm value (F value) is directly detected using a Hall element, etc. There are devices that correct the white balance electrically, but this uses an expensive Hall element, which increases the number of components and makes the electrical circuit complicated.
This is not desirable as it increases the total cost of the camera and increases the weight of the TV camera.
（考案の目的）
本考案は上記従来の欠点に鑑みなされたもので
あり、変倍光学系と結像光学系との間に同心状に
形成した白バランス補正フイルタ部を備えたフイ
ルタを配置することにより、上記したような撮像
光学系の状態変化に伴なう白バランス変動を抑制
して、TVカメラに常に一定の白バランスを得る
ようにしたことにある。(Purpose of the invention) The present invention was devised in view of the above-mentioned drawbacks of the conventional technology, and includes disposing a filter having a white balance correction filter section formed concentrically between the variable magnification optical system and the imaging optical system. As a result, the above-mentioned variations in white balance caused by changes in the state of the imaging optical system are suppressed, and a constant white balance is always obtained for the TV camera.
（考案の構成）
本考案は、変倍光学系と結像光学系との間に配
置された開口絞りと、前記開口絞りに近接配置さ
れ、白バランス補正フイルタ部と白色光透過部と
を同心状に形成したフイルタとを備えたことを特
徴とする撮像装置を提供するものである。(Structure of the invention) The present invention includes an aperture stop arranged between a variable magnification optical system and an imaging optical system, and a white balance correction filter part and a white light transmitting part that are arranged close to the aperture stop and concentric with each other. The present invention provides an imaging device characterized by comprising a filter formed in a shape.
（実施例）
第５図は本考案になる撮像装置の一実施例であ
り、撮像光学系における光束の入射状態を示す断
面図、第６図は白バランス補正フイルタ部を備え
たフイルタであり、撮像管の光導電膜側より開口
絞り方向を見た時の状態を示した正面図である。(Embodiment) FIG. 5 shows an embodiment of the imaging device according to the present invention, and is a cross-sectional view showing the incident state of the light beam in the imaging optical system, and FIG. 6 shows a filter equipped with a white balance correction filter section. FIG. 3 is a front view showing the state of the image pickup tube when viewed from the photoconductive film side in the direction of the aperture stop.
各図において、被写体側に位置する変倍光学系
１０と、例えば撮像管などの撮像素子１１側に配
置された結像光学系１２との間には、この結像光
学系１２の焦点位置近傍において開口絞り１３が
配置されている。 In each figure, there is a gap between the variable magnification optical system 10 located on the subject side and the imaging optical system 12 located on the imaging element 11 side, such as an imaging tube, near the focal position of the imaging optical system 12. An aperture stop 13 is arranged at.
また、開口絞り１３の変倍光学系１０側（変倍
光学系における被写体より同族光線束が平行にな
る所謂平行光束部）には、これと近接して白バラ
ンス補正用のフイルタ１４が光軸を一致させて配
置されているものである。 Further, on the side of the variable magnification optical system 10 of the aperture diaphragm 13 (the so-called parallel beam part where the same ray bundle is parallel to the object in the variable magnification optical system), there is a filter 14 for white balance correction adjacent to the optical axis. They are arranged so that they match.
前記白バランス補正用のフイルタ１４は、第６
図に示す如く、緑色光を透過する緑色光透過部１
５が中心部に円形状に形成され、その周辺部には
白色光を透過する白色光透過部１６がこれと同心
状に形成されている。 The white balance correction filter 14 includes a sixth
As shown in the figure, a green light transmitting section 1 that transmits green light.
5 is formed in a circular shape at the center, and a white light transmitting section 16 that transmits white light is formed concentrically at the periphery thereof.
つまり、フイルタ１４の中央部と周辺部とは光
束の透過率が異なるようになつている。 In other words, the transmittance of the light beam is different between the central part and the peripheral part of the filter 14.
なお、結像光学系１２の焦点上に光軸を横ぎる
光線の主光線E1は第１図に示すような撮像素子
１１の光導電膜６に垂直に入射する。 Note that the chief ray E1 of the light beam that crosses the optical axis on the focal point of the imaging optical system 12 is perpendicularly incident on the photoconductive film 6 of the image sensor 11 as shown in FIG.
しかるに、第２図に示す如くのストライプフイ
ルタ２を備えた撮像管のカラーTVカメラに白バ
ランス用のフイルタ１４を適用した場合は、その
撮像管の出力信号中の変調波の変調度が、上記し
たようにＦ値が小となるほど低下するため、緑色
信号Ｇが青色信号Ｂや赤色信号Ｒに比して相対的
に大となる。 However, if the white balance filter 14 is applied to a color TV camera with an image pickup tube equipped with a stripe filter 2 as shown in FIG. 2, the degree of modulation of the modulated wave in the output signal of the image pickup tube will be As described above, the smaller the F value, the lower the value, so the green signal G becomes relatively larger than the blue signal B and the red signal R.
従つて、結像光学系の分光透過率特性は、第７
図に示す如く、Ｆ値が4.0以上では緑色光Ｇに比
して青色光Ｂ、赤色光Ｒをあまり透過させないよ
うな特性となり、またＦ値が4.0より小となるほ
ど青色光Ｂ、赤色光Ｒを緑色光Ｇに比して相対的
に多く透過させるような特性となるため、上記Ｆ
値の変化によつて緑色信号レベルが他の２原色信
号レベルに比して相対的に大となつて、例えば、
Ｆ値が４以上の状態で白バランスをとつて、開口
絞り１３を点線で示す如く大きくした場合（Ｆ値
が小）でも緑色光Ｇ以外の光量は相対的に大とな
つて、変化する白バランスは、Ｆ値の変化に拘わ
らず３原色信号レベルのそれぞれの相対値関係を
略一定とし得るので所望の色に補正できる。な
お、第７図においてＦ値が1.4の時のR/Gおよび
Ｂ／Ｇ共に100％として図示してある。 Therefore, the spectral transmittance characteristic of the imaging optical system is the seventh
As shown in the figure, when the F value is 4.0 or more, blue light B and red light R are less transmitted than green light G, and as the F value is smaller than 4.0, blue light B and red light R are transmitted less. The above F
Due to the change in value, the green signal level becomes relatively large compared to the other two primary color signal levels, for example,
Even if the aperture diaphragm 13 is increased as shown by the dotted line to maintain white balance with the F value of 4 or higher (the F value is small), the amount of light other than the green light G will become relatively large, and the white color will change. The balance allows the relative value relationship of the three primary color signal levels to be substantially constant regardless of changes in the F value, so it is possible to correct the color to a desired color. In addition, in FIG. 7, both R/G and B/G are shown as 100% when the F value is 1.4.
また、第６図に示す如くフイルタ１４は、その
分光透過率が異なる部分、即ち緑色光透過部１５
を入射光束に対して円形状としてその光軸上に配
置してあるため、例えば同じ色の像の位置の変化
によつて、光導電膜上で結像する像の色が各位置
において変化することがなく、安定した状態を維
持し得るので理想的である。 Further, as shown in FIG. 6, the filter 14 has a portion with different spectral transmittance, that is, a green light transmitting portion 15
is arranged in a circular shape with respect to the incident light beam on its optical axis, so for example, by changing the position of images of the same color, the color of the image formed on the photoconductive film changes at each position. This is ideal because it can maintain a stable state without causing any problems.
従つて、このフイルタ１４は、例えば第８図に
示す如く、第７図に近似した所望の分光透過率特
性を得ることができる。ただし、第８図はＦ値
1.4のときの（入射平行光束のとき）R/G・B/G
共に90％であるものとして図示してある。 Therefore, this filter 14 can obtain a desired spectral transmittance characteristic similar to that shown in FIG. 7, as shown in FIG. 8, for example. However, Figure 8 shows the F value
R/G・B/G at 1.4 (when incident parallel light flux)
Both are shown as being 90%.
なお、上記実施例においては平行光束部に第６
図に示すようなフイルタ１４を設けた場合につい
て説明したが、平行光束部にハーフミラーにより
光束の一部を分岐し、これを光学フアインダに入
射させる所謂TTLフアインダ方式レンズにおい
て、ハーフミラーの反射および透過の両方の供せ
られる部分（中央部）の分光透過率を他の部分
（周辺部）の分光透過率と異ならせて第７図に示
す特性を得るようにしてもよい。この場合光学フ
アインダには緑色光成分の小なる光が供給される
が、実際使用上はほとんど差支えない。 In addition, in the above embodiment, the sixth parallel light beam part is
Although the case where the filter 14 as shown in the figure is provided has been described, in a so-called TTL finder type lens in which a part of the light beam is split by a half mirror in the parallel light beam part and is incident on the optical finder, the reflection of the half mirror and the The characteristics shown in FIG. 7 may be obtained by making the spectral transmittance of the portion (central portion) which is provided with both transmissions different from the spectral transmittance of the other portion (peripheral portion). In this case, a small amount of light with a green light component is supplied to the optical viewfinder, but this poses almost no problem in actual use.
第９図および第１０図は本考案装置の第２の実
施例を示す図で、上記第１の実施例と異なるとこ
ろは白バランス補正用のフイルタ１７を第６図と
は対称的に形成したものであるから、以下その点
についてのみ説明し、上記第１の実施例と同一の
部分には同一の符号を付してその具体的な説明は
省略する。 FIGS. 9 and 10 are diagrams showing a second embodiment of the device of the present invention, and the difference from the first embodiment is that the filter 17 for white balance correction is formed symmetrically with that in FIG. 6. Therefore, only that point will be explained below, and the same parts as in the first embodiment will be denoted by the same reference numerals, and a detailed explanation thereof will be omitted.
白バランス補正用のフイルタ１７は、第１０図
に示す如く、中心部には白色光を透過する円形状
に形成された白色光透過部１８が設けられると共
に、その周辺部には赤色光を透過する赤色光透過
部１９がこれと同心状に形成されている。 As shown in FIG. 10, the filter 17 for white balance correction is provided with a white light transmitting section 18 formed in a circular shape that transmits white light at the center, and a white light transmitting section 18 that transmits red light at the periphery thereof. A red light transmitting section 19 is formed concentrically with this.
つまり、フイルタ１７の中央部と周辺部とは光
束の透過率が異なるようになつている。 In other words, the transmittance of the light beam is different between the central part and the peripheral part of the filter 17.
結像光学系１２の焦点上で光軸を横ぎる光束の
主光線E2は第１図に示すような撮像素子１１の
光導電膜６に垂直に入射する。 The principal ray E2 of the light flux that crosses the optical axis on the focal point of the imaging optical system 12 is perpendicularly incident on the photoconductive film 6 of the image sensor 11 as shown in FIG.
ここで、開口絞り１３の開口径が白色透過部１
８と略同一の場合には最初にとつた白バランスは
変化することはないが、図に点線で示す如く、開
口絞り１３の開口径がフイルタ１７の白色光透過
部１８より大となると、その開口径と白色透過部
１８の径との差の部分２０によつて被写体からの
入射光束の成分が赤色光透過部１９によつて選択
されるため、光導電膜上で交差する主光線E2の
外側の光束が開口絞り１３の開口径を補正して安
定した白バランスを得ることができる。従つて、
Ｆ値が小となつた時にはＦ値が大となつた時に比
して相対的に赤系統の色の光を多く透過させるの
で、Ｆ値の変化に拘わらず撮像管の入射光の特性
を略一定にすることができ、白バランスの変化は
ほとんど生じることはない。また、白色透過部１
８と赤色透過部１９とが同心状に配置されている
ため、同じ色の像の位置の変化によつて、光導電
膜上で結像される像の色が各位置において変化す
ることがなく、常に安定した白バランスを得るこ
とができる。 Here, the aperture diameter of the aperture stop 13 is
8, the initially established white balance will not change, but if the aperture diameter of the aperture diaphragm 13 becomes larger than the white light transmitting section 18 of the filter 17, as shown by the dotted line in the figure, the white balance will not change. Since the component of the incident light flux from the subject is selected by the red light transmitting part 19 based on the difference 20 between the aperture diameter and the diameter of the white transmitting part 18, the chief ray E 2 intersecting on the photoconductive film A stable white balance can be obtained by correcting the aperture diameter of the aperture diaphragm 13 by the light flux outside of the aperture stop 13. Therefore,
When the F number is small, relatively more red-colored light is transmitted than when the F number is large, so regardless of changes in the F number, the characteristics of the incident light on the image pickup tube are It can be kept constant, and there is almost no change in white balance. In addition, the white transparent part 1
8 and the red transmitting section 19 are arranged concentrically, the color of the image formed on the photoconductive film does not change at each position even if the position of the image of the same color changes. , you can always obtain a stable white balance.
なお、本考案装置において、フイルタの構成は
第２図に示すもの以外でもよく、例示の１搬送波
周波数分離方式に限定されるものではない。 Note that in the device of the present invention, the configuration of the filter may be other than that shown in FIG. 2, and is not limited to the one-carrier frequency separation method illustrated.
（効果）
以上の如く、本考案になる撮像装置は、分光透
過率特性の異る部分を同心状に形成したフイルタ
を開口絞りに近接配置することにより、従来装置
の如く複雑な回路構成による電気信号処理、ある
いは高価なホール素子などを使用することなく簡
単に白バランスを補正し得、また、開口絞り値、
焦点距離、射出瞳位置などに起因する撮像光学系
の状態変化、あるいは光学系の口径触などによつ
て生ずる白バランスの変動を抑制して、常に一定
の白バランスを得ることができるなどの特長を有
する。(Effects) As described above, the imaging device according to the present invention has a filter in which parts with different spectral transmittance characteristics are concentrically formed, and is arranged close to the aperture stop, thereby making it possible to avoid the use of complicated circuit configurations in conventional devices. You can easily correct the white balance without using signal processing or expensive Hall elements, and you can also adjust the aperture value,
Features include the ability to always obtain a constant white balance by suppressing fluctuations in white balance caused by changes in the state of the imaging optical system due to focal length, exit pupil position, etc., or by iris of the optical system, etc. has.
第１図は撮像管ターゲツトの一例を示す拡大断
面図、第２図はストライプフイルタの内部構成の
一例を示す図、第３図はストライプフイルタ内蔵
撮像管の出力映像信号の変調度と開口絞り値との
関係の一例を示す図、第４図は従来装置のテレセ
ントリツク光学系の断面図、第５図は本考案にな
る撮像装置の一実施例を示す光学系断面図、第６
図は本考案なる撮像装置に用いられる白バランス
補正用のフイルタであり、撮像素子の光導電膜側
より開口絞り方向を見た時の状態を示す第１の実
施例の正面図、第７図はストライプフイルタ内蔵
撮像管を使用した場合において要求される分光透
過率補正特性の一例を示す図、第８図はストライ
プフイルタ内蔵のテレビジヨンカメラにおいて第
６図に示す本考案装置を使用した場合の第１の実
施例の分光透過特性を示す図、第９図は本考案に
なる撮像装置の第２の実施例を示す光学系の断面
図、第１０図は本考案になる撮像装置に用いられ
る白バランス補正用のフイルタであり、撮像素子
の光導電膜側より開口絞り方向を見た時の状態を
示す第２の実施例の正面図である。
１……フエースガラス、２……ストライプフイ
ルタ、３……接着剤、４……薄板ガラス、１０…
…変倍光学系、１１……撮像素子、１２……結像
光学系、１３……開口絞り、１４，１７……フイ
ルタ。
Figure 1 is an enlarged cross-sectional view of an example of an image pickup tube target, Figure 2 is a diagram showing an example of the internal configuration of a stripe filter, and Figure 3 is the modulation degree and aperture value of the output video signal of the image pickup tube with a built-in stripe filter. FIG. 4 is a sectional view of a telecentric optical system of a conventional device, FIG. 5 is a sectional view of an optical system of an embodiment of an imaging device according to the present invention, and FIG.
The figure shows a filter for white balance correction used in the imaging device of the present invention, and is a front view of the first embodiment, showing the state when viewed from the photoconductive film side of the imaging device toward the aperture stop, and FIG. Figure 8 shows an example of the spectral transmittance correction characteristics required when using an image pickup tube with a built-in stripe filter. A diagram showing the spectral transmission characteristics of the first embodiment, FIG. 9 is a cross-sectional view of the optical system showing the second embodiment of the imaging device according to the present invention, and FIG. 10 is a diagram showing the optical system used in the imaging device according to the present invention. FIG. 7 is a front view of a second embodiment of the filter for white balance correction, showing the state when viewed from the photoconductive film side of the image sensor in the direction of the aperture stop. 1... Face glass, 2... Stripe filter, 3... Adhesive, 4... Thin glass, 10...
...variable power optical system, 11...imaging element, 12...imaging optical system, 13...aperture diaphragm, 14, 17...filter.
Claims (1)
口絞りと、前記開口絞りに近接配置され、白バラ
ンス補正フイルタ部と白色光透過部とを同心状に
形成したフイルタとを備えたことを特徴とする撮
像装置。 An aperture diaphragm disposed between a variable magnification optical system and an imaging optical system, and a filter disposed close to the aperture diaphragm in which a white balance correction filter section and a white light transmission section are concentrically formed. An imaging device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP289984U JPS60115201U (en) | 1984-01-12 | 1984-01-12 | Imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP289984U JPS60115201U (en) | 1984-01-12 | 1984-01-12 | Imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60115201U JPS60115201U (en) | 1985-08-03 |
| JPH0248801Y2 true JPH0248801Y2 (en) | 1990-12-21 |
Family
ID=30477009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP289984U Granted JPS60115201U (en) | 1984-01-12 | 1984-01-12 | Imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60115201U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013161073A (en) * | 2012-02-09 | 2013-08-19 | Topcon Corp | Wavelength selection optical element, microscope using the wavelength selection optical element, and digital camera using the wavelength selection optical element |
-
1984
- 1984-01-12 JP JP289984U patent/JPS60115201U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60115201U (en) | 1985-08-03 |
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