【特許請求の範囲】
【請求項１】 以下に示す条件式を満足する干渉膜を２面以上用いたことを特徴とする撮像装置。
Ｔｖ＞９８％
３０％＜Ｔｉ＜６０％
−０．６％／ｎｍ＜Ｋ＜−０．２％／ｎｍ
但し、Ｔｖは前記干渉膜における４２０ｎｍ〜５３０ｎｍの波長の分光透過率、Ｔｉは前記干渉膜における７２０ｎｍ〜９２０ｎｍの波長の分光透過率、Ｋは前記干渉膜における６２０ｎｍの波長の分光透過率の傾きを示す。
【請求項２】 光源と照明光学系と撮像光学系と可視光線から近赤外線の波長域にかけて感度をもつ撮像素子を有する撮像装置において、
青から緑にかけての可視光線の反射を防止し、赤から近赤外線の光の透過率をなだらかに減少させるような干渉膜を前記撮像光学系の中または前記照明光学系の中の少なくとも一方に設けており、
前記照明光学系には先端照明光学系が設けられており、前記先端照明光学系全体の分光透過率と前記撮像光学系全体の分光透過率との積が以下に示す条件式を満足していることを特徴とする撮像装置。
Ｔｖｔ＞７５％
Ｔｉｔ＜１５％
−２％／ｎｍ＜Ｋｔ＜−０．５％／ｎｍ
但し、Ｔｖｔは前記先端照明光学系全体における４２０ｎｍ〜５３０ｎｍの波長の分光透過率と前記入射端側光学素子における４２０ｎｍ〜５３０ｎｍの波長の分光透過率と前記撮像光学系全体における４２０ｎｍ〜５３０ｎｍの波長の分光透過率の積、Ｔｉｔは前記先端照明光学系全体における７２０ｎｍ〜９２０ｎｍの波長の分光透過率と前記入射端側光学素子における７２０ｎｍ〜９２０ｎｍの波長の分光透過率と前記撮像光学系全体における７２０ｎｍ〜９２０ｎｍの波長の分光透過率との積、Ｋｔは前記先端照明光学系全体における６２０ｎｍの波長の分光透過率と前記入射端側光学素子における６２０ｎｍの波長の分光透過率と前記撮像光学系全体における６２０ｎｍの波長の分光透過率との積の傾きを示す。
【請求項３】 近赤外の波長のレーザー光を用いてレーザー処理を行う内視鏡に用いる撮像装置であって、
該撮像装置を構成する撮像光学系中に、１枚以上のレーザー光を吸収するフィルターと、Ｎ面のレーザー光の透過率を減少させる干渉膜Ａ(J)(J＝1,2,・・・・,N) を設け、かつ、以下に示す条件式を満足する内視鏡の撮像装置。
Ｔｖａ(J)＞９８％ (J＝1,2,・・・・,N)
３０％＜Ｔｉａ(J)＜６０％ (J＝1,2,・・・・,N)
Ｔａｂ＜５％
Ｔｉａ(1)×Ｔｉａ(2)×・・・・×Ｔｉａ(N)×Ｔａｂ＜１％
但し、Ｔｖａ(J)は前記干渉膜Ａ(J)における４２０ｎｍ〜５３０ｎｍの波長の分光透過率、Ｔｉａ(J)は前記干渉膜Ａ(J)におけるレーザー光の波長での分光透過率、Ｔａｂは前記レーザー光を吸収するフィルターにおけるレーザー光の波長での分光透過率、Ｎは前記干渉膜Ａ(J)の面数を示す。
【請求項４】 近赤外の波長のレーザー光を用いてレーザー処理を行う内視鏡に用いる撮像装置であって、該撮像装置を構成する撮像光学系中に、Ｎ面のレーザー光の透過率を減少させる干渉膜Ａ (J) (J＝1,2,・・・・,N) を設け、かつ、以下に示す条件式を満足する内視鏡の撮像装置。
Ｔｖａ (J) ＞９８％ (J＝1,2,・・・・,N)
３０％＜Ｔｉａ (J) ＜６０％ (J＝1,2,・・・・,N)
Ｔａｂ＜５％
Ｔｉａ (1) ×Ｔｉａ (2) ×・・・・×Ｔｉａ (N) ×Ｔａｂ＜１％
但し、Ｔｖａ (J) は前記干渉膜Ａ (J) における４２０ｎｍ〜５３０ｎｍの波長の分光透過率、Ｔｉａ (J) は前記干渉膜Ａ (J) におけるレーザー光の波長での分光透過率、Ｔａｂは前記レーザー光を吸収するフィルターにおけるレーザー光の波長での分光透過率、Ｎは前記干渉膜Ａ (J) の面数を示す。
[Claims]
1. An imaging apparatus according to claim 1, wherein two or more interference films satisfying the following conditional expression are used.
Tv> 98%
30% <Ti <60%
-0.6% / nm <K <-0.2% / nm
However, Tv is the spectral transmittance of the interference film at a wavelength of 420 nm to 530 nm, Ti is the spectral transmittance of the interference film at a wavelength of 720 nm to 920 nm, and K is the gradient of the spectral transmittance of the interference film at a wavelength of 620 nm. Shown.
2. An imaging device having a light source, an illumination optical system, an imaging optical system, and an imaging element having sensitivity in the wavelength range of visible light to near infrared rays.
An interference film is provided in at least one of the imaging optical system or the illumination optical system to prevent reflection of visible light from blue to green and gently reduce the transmittance of red to near infrared light. And
The illumination optical system is provided with an advanced illumination optical system, and the product of the spectral transmittance of the entire advanced illumination optical system and the spectral transmittance of the entire imaging optical system satisfies the conditional expression shown below. An imaging device characterized by this.
Tvt> 75%
Tit <15%
-2% / nm <Kt <-0.5% / nm
However, Tvt has a spectral transmittance of 420 nm to 530 nm in the entire advanced illumination optical system, a spectral transmittance of 420 nm to 530 nm in the incident end side optical element, and a wavelength of 420 nm to 530 nm in the entire imaging optical system. The product of the spectral transmittances, Tit, is the spectral transmittance of the wavelength of 720 nm to 920 nm in the entire advanced illumination optical system, the spectral transmittance of the wavelength of 720 nm to 920 nm in the incident end side optical element, and 720 nm to the entire imaging optical system. The product of the spectral transmittance of the wavelength of 920 nm, Kt is the spectral transmittance of the wavelength of 620 nm in the entire advanced illumination optical system, the spectral transmittance of the wavelength of 620 nm in the incident end side optical element, and 620 nm in the entire imaging optical system. The slope of the product of the spectral transmittance of the wavelength of.
3. An imaging device used for an endoscope that performs laser processing using laser light having a wavelength of near infrared rays.
In the imaging optical system constituting the imaging device, a filter that absorbs one or more laser beams and an interference film A (J) (J = 1, 2, ...・ ・, N) is provided, and an endoscope imaging device that satisfies the following conditional expression.
Tva (J) > 98% (J = 1,2, ..., N)
30% <Tia (J) <60% (J = 1,2, ..., N)
Tab <5%
Tia (1) × Tia (2) × ・ ・ ・ ・ × Tia (N) × Tab <1%
However, Tva (J) is the spectral transmittance of the interference film A (J) at a wavelength of 420 nm to 530 nm, Tia (J) is the spectral transmittance of the interference film A (J) at the wavelength of the laser light, and Tab is The spectral transmittance at the wavelength of the laser light in the filter that absorbs the laser light, N indicates the number of surfaces of the interference film A (J).
4. An imaging device used for an endoscope that performs laser processing using a laser beam having a near-infrared wavelength, and transmission of N-plane laser light into an imaging optical system constituting the imaging device. An endoscope imaging device provided with interference films A (J) (J = 1,2, ..., N) for reducing the rate and satisfying the following conditional equations.
Tva (J) > 98% (J = 1,2, ..., N)
30% <Tia (J) <60% (J = 1,2, ..., N)
Tab <5%
Tia (1) × Tia (2) × ・ ・ ・ ・ × Tia (N) × Tab <1%
However, Tva (J) is the spectral transmittance of the interference film A (J) at a wavelength of 420 nm to 530 nm, Tia (J) is the spectral transmittance of the interference film A (J) at the wavelength of the laser light, and Tab is The spectral transmittance at the wavelength of the laser light in the filter that absorbs the laser light, N indicates the number of surfaces of the interference film A (J).
請求項１にかかる発明は、以下に示す条件式を満足する干渉膜を２面以上用いた撮像装置に関するものである。
Ｔｖ＞９８％
３０％＜Ｔｉ＜６０％
−０．６％／ｎｍ＜Ｋ＜−０．２％／ｎｍ
但し、Ｔｖは前記干渉膜における４２０ｎｍ〜５３０ｎｍの波長の分光透過率、Ｔｉは前記干渉膜における７２０ｎｍ〜９２０ｎｍの波長の分光透過率、Ｋは前記干渉膜における６２０ｎｍの波長の分光透過率の傾きを示す。
The invention according to claim 1 relates to an image pickup apparatus using two or more interference films satisfying the following conditional expression.
Tv> 98%
30% <Ti <60%
-0.6% / nm <K <-0.2% / nm
However, Tv is the spectral transmittance of the interference film at a wavelength of 420 nm to 530 nm, Ti is the spectral transmittance of the interference film at a wavelength of 720 nm to 920 nm, and K is the gradient of the spectral transmittance of the interference film at a wavelength of 620 nm. Shown.
請求項２にかかる発明は、光源と照明光学系と撮像光学系と可視光線から近赤外線の波長域にかけて感度をもつ撮像素子を有する撮像装置において、青から緑にかけての可視光線の反射を防止し、赤から近赤外線の光の透過率をなだらかに減少させるような干渉膜を撮像光学系の中または照明光学系の中の少なくとも一方に設けており、前記照明光学系には先端照明光学系が設けられており、前記先端照明光学系全体の分光透過率と前記撮像光学系全体の分光透過率との積が以下に示す条件式を満足する撮像装置に関するものである。
Ｔｖｔ＞７５％
Ｔｉｔ＜１５％
−２％／ｎｍ＜Ｋｔ＜−０．５％／ｎｍ
但し、Ｔｖｔは前記先端照明光学系全体における４２０ｎｍ〜５３０ｎｍの波長の分光透過率と前記入射端側光学素子における４２０ｎｍ〜５３０ｎｍの波長の分光透過率と前記撮像光学系全体における４２０ｎｍ〜５３０ｎｍの波長の分光透過率の積、Ｔｉｔは前記先端照明光学系全体における７２０ｎｍ〜９２０ｎｍの波長の分光透過率と前記入射端側光学素子における７２０ｎｍ〜９２０ｎｍの波長の分光透過率と前記撮像光学系全体における７２０ｎｍ〜９２０ｎｍの波長の分光透過率との積、Ｋｔは前記先端照明光学系全体における６２０ｎｍの波長の分光透過率と前記入射端側光学素子における６２０ｎｍの波長の分光透過率と前記撮像光学系全体における６２０ｎｍの波長の分光透過率との積の傾きを示す。
The invention according to claim 2 prevents reflection of visible light from blue to green in an image pickup apparatus having a light source, an illumination optical system, an imaging optical system, and an imaging device having sensitivity in the wavelength range of visible light to near infrared rays. , An interference film that gently reduces the transmittance of red to near-infrared light is provided in at least one of the imaging optical system or the illumination optical system, and the illumination optical system has an advanced illumination optical system. The present invention relates to an image pickup apparatus in which the product of the spectral transmittance of the entire advanced illumination optical system and the spectral transmittance of the entire imaging optical system satisfies the conditional expression shown below.
Tvt> 75%
Tit <15%
-2% / nm <Kt <-0.5% / nm
However, Tvt has a spectral transmittance of 420 nm to 530 nm in the entire advanced illumination optical system, a spectral transmittance of 420 nm to 530 nm in the incident end side optical element, and a wavelength of 420 nm to 530 nm in the entire imaging optical system. The product of the spectral transmittances, Tit, is the spectral transmittance of the wavelength of 720 nm to 920 nm in the entire advanced illumination optical system, the spectral transmittance of the wavelength of 720 nm to 920 nm in the incident end side optical element, and 720 nm to the entire imaging optical system. The product of the spectral transmittance of the wavelength of 920 nm, Kt is the spectral transmittance of the wavelength of 620 nm in the entire advanced illumination optical system, the spectral transmittance of the wavelength of 620 nm in the incident end side optical element, and 620 nm in the entire imaging optical system. The slope of the product of the spectral transmittance of the wavelength of.
請求項３にかかる発明は、近赤外の波長のレーザー光を用いてレーザー処理を行う内視鏡に用いる撮像装置であって、該撮像装置を構成する撮像光学系中に、１枚以上のレーザー光を吸収するフィルターと、Ｎ面のレーザー光の透過率を減少させる干渉膜Ａ(J)(J＝1,2,・・・・,N) を設け、かつ、以下に示す条件式を満足する撮像装置に関するものである。
Ｔｖａ(J)＞９８％ (J＝1,2,・・・・,N)
３０％＜Ｔｉａ(J)＜６０％ (J＝1,2,・・・・,N)
Ｔａｂ＜５％
Ｔｉａ(1)×Ｔｉａ(2)×・・・・×Ｔｉａ(N)×Ｔａｂ＜１％
但し、Ｔｖａ(J)は前記干渉膜Ａ(J)における４２０ｎｍ〜５３０ｎｍの波長の分光透過率、Ｔｉａ(J)は前記干渉膜Ａ(J)におけるレーザー光の波長での分光透過率、Ｔａｂは前記レーザー光を吸収するフィルターにおけるレーザー光の波長での分光透過率、Ｎは前記干渉膜Ａ(J)の面数を示す。
また、請求項４にかかる発明は、近赤外の波長のレーザー光を用いてレーザー処理を行う内視鏡に用いる撮像装置であって、該撮像装置を構成する撮像光学系中に、Ｎ面のレーザー光の透過率を減少させる干渉膜Ａ (J) (J＝1,2,・・・・,N) を設け、かつ、以下に示す条件式を満足する撮像装置に関するものである。
Ｔｖａ (J) ＞９８％ (J＝1,2,・・・・,N)
３０％＜Ｔｉａ (J) ＜６０％ (J＝1,2,・・・・,N)
Ｔａｂ＜５％
Ｔｉａ (1) ×Ｔｉａ (2) ×・・・・×Ｔｉａ (N) ×Ｔａｂ＜１％
但し、Ｔｖａ (J) は前記干渉膜Ａ (J) における４２０ｎｍ〜５３０ｎｍの波長の分光透過率、Ｔｉａ (J) は前記干渉膜Ａ (J) におけるレーザー光の波長での分光透過率、Ｔａｂは前記レーザー光を吸収するフィルターにおけるレーザー光の波長での分光透過率、Ｎは前記干渉膜Ａ (J) の面数を示す。
The invention according to claim 3 is an imaging device used for an endoscope that performs laser processing using laser light having a wavelength of near infrared rays, and one or more images are included in the imaging optical system constituting the imaging device. A filter that absorbs the laser light and an interference film A (J) (J = 1,2, ..., N) that reduces the transmittance of the laser light on the N surface are provided, and the conditional expression shown below is used. It relates to a satisfactory imaging device.
Tva (J) > 98% (J = 1,2, ..., N)
30% <Tia (J) <60% (J = 1,2, ..., N)
Tab <5%
Tia (1) × Tia (2) × ・ ・ ・ ・ × Tia (N) × Tab <1%
However, Tva (J) is the spectral transmittance of the interference film A (J) at a wavelength of 420 nm to 530 nm, Tia (J) is the spectral transmittance of the interference film A (J) at the wavelength of the laser light, and Tab is The spectral transmittance at the wavelength of the laser light in the filter that absorbs the laser light, N indicates the number of surfaces of the interference film A (J).
The invention according to claim 4 is an imaging device used for an endoscope that performs laser processing using laser light having a wavelength of near infrared rays, and has an N-plane in an imaging optical system constituting the imaging device. The present invention relates to an image pickup apparatus provided with an interference film A (J) (J = 1,2, ..., N) for reducing the transmittance of the laser light of the above, and which satisfies the following conditional equation.
Tva (J) > 98% (J = 1,2, ..., N)
30% <Tia (J) <60% (J = 1,2, ..., N)
Tab <5%
Tia (1) × Tia (2) × ・ ・ ・ ・ × Tia (N) × Tab <1%
However, Tva (J) is the spectral transmittance of the interference film A (J) at a wavelength of 420 nm to 530 nm, Tia (J) is the spectral transmittance of the interference film A (J) at the wavelength of the laser light, and Tab is The spectral transmittance at the wavelength of the laser light in the filter that absorbs the laser light, N indicates the number of surfaces of the interference film A (J).