JP2014215400A - Endoscope apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily generate a two-dimensional color image, while enabling acquisition of three-dimensional information on an observation object.SOLUTION: An endoscope apparatus 1 includes: an optical system 2 that condenses light from a subject; a two-dimensional sensor 3 with a color filter 3 that is arranged on an image formation plane T of the optical system 2, and photographs the light condensed by the optical system 2; an optical mask that has two first openings 9 arranged at intervals in a direction crossing an optical axis, and has two kinds of wavelength selection filters 10 having mutually different transmission wavelength bands individually arranged in the first openings 9; and a mask state change-over part that alternatively changes over a status of the optical mask to a first state where light made incident on the two-dimensional sensor 3 with the color filter passes through only the first openings 9 or a second state where the light made incident on the two-dimensional sensor 3 with the color filter does not pass through the first openings 9. Two kinds of wavelength selection filters 10 of the optical mask have a transmission wavelength band overlapping any color filter of the two-dimensional sensor 3 with the color filter.

Description

  The present invention relates to an endoscope apparatus.

  2. Description of the Related Art Conventionally, a stereoscopic endoscope is known in which a color filter having at least three types of regions having different transmission wavelengths is provided inside an observation optical system of a stereoscopic endoscope. According to this stereoscopic endoscope, a pair of images having parallax can be obtained from light that has passed through different regions of the color filter, and the observation target can be observed stereoscopically.

Japanese Patent Laid-Open No. 10-48538

  However, in the stereoscopic endoscope of Patent Document 1, when acquiring a two-dimensional color image to be observed, the intensity for each color at each position on the image is estimated from a pair of images having parallax and synthesized. There is an inconvenience that the processing takes time. In addition, in an image having parallax, there is a possibility that information may be lost due to the influence of the unevenness of the subject, and there is a disadvantage that an image to be synthesized is deteriorated.

  The present invention has been made in view of the above-described circumstances, and provides an endoscope apparatus that can easily generate a two-dimensional color image while enabling acquisition of three-dimensional information of an observation target. It is an object.

In order to achieve the above object, the present invention provides the following means.
One aspect of the present invention is an optical system that collects light from a subject, a two-dimensional sensor with a color filter that is disposed on an imaging surface of the optical system and photographs light collected by the optical system, An optical mask having two first openings arranged at intervals in a direction intersecting the optical axis, and two kinds of wavelength selective filters having different transmission wavelength bands arranged separately in the first opening. Then, the state of the optical mask is selected as a first state in which light incident on the two-dimensional sensor with a color filter is transmitted only through the first opening or a second state in which light is not transmitted through the first opening. An endoscopic device having a transmission wavelength band in which the two wavelength selection filters of the optical mask overlap with any one of the color filters of the two-dimensional sensor with the color filter. provide.

  According to the present invention, there is an effect that a two-dimensional color image can be easily generated while obtaining three-dimensional information of an observation target.

It is a lineblock diagram of the endoscope apparatus of the 1st state of a 1st embodiment. It is a block diagram of the endoscope apparatus of the 2nd state of 1st Embodiment. It is a block diagram of the optical mask of 1st Embodiment. It is a block diagram of the endoscope apparatus of the 1st state of 2nd Embodiment. It is a block diagram of the endoscope apparatus of the 2nd state of 2nd Embodiment. It is a block diagram of the optical mask of 2nd Embodiment. It is a block diagram of the endoscope apparatus of the 1st state of 3rd Embodiment. It is a block diagram of the endoscope apparatus of the 2nd state of 3rd Embodiment. It is a block diagram of the modification of the optical mask of 1st Embodiment. It is a block diagram of the modification of 2nd Embodiment.

An endoscope apparatus 1 according to a first embodiment will be described below with reference to the drawings.
As shown in FIGS. 1 and 3, an endoscope apparatus 1 according to the present embodiment is disposed on an optical system 2 that collects light from a subject, and an imaging plane T of the optical system 2, and the optical system A two-dimensional sensor 3 with a color filter that captures the light collected by 2, a first mask member 4 a and a second mask member 4 b having openings through which light can be transmitted, and these mask members 4 a and 4 b. Alternatively, a mask state switching unit 5 that is inserted into and removed from the optical path of the pupil plane A of the optical system 2 is provided. Note that the mask members 4a and 4b are not necessarily inserted into and removed from the optical path of the pupil plane A of the optical system 2, and may be inserted into and removed from the optical path “near” the pupil plane A. Hereinafter, when it is described as the pupil plane A, the vicinity of the pupil plane A is also included.

The optical system 2 is configured by arranging a plurality of optical elements 2 a in a direction along the optical axis S.
The two-dimensional sensor 3 with a color filter is, for example, a color CCD, and a sensor unit 6 having a plurality of pixels arranged in a matrix and a continuous array of RGB, for example, corresponding to each pixel of the sensor unit 6 And a filter unit 7 including a plurality of types of color filters arranged in a Bayer array. The transmission wavelength bands of various color filters are different.

  The optical mask 8 includes separate first and second mask members 4a and 4b configured in a substantially flat shape by a material that blocks light. The first mask member 4a has two first openings 9 that are disposed so as to penetrate in the thickness direction with a space therebetween. Two types of wavelength selection filters 10 having different transmission wavelength bands are individually disposed in the two first openings 9. The transmission wavelength band of each wavelength selection filter 10 overlaps the transmission wavelength band of any different filter unit 7 of the two-dimensional sensor 3 with the color filter.

  As shown in FIG. 2, the second mask member 4b has a second opening 11 penetrating in the thickness direction at the center. The second opening 11 is a single through hole that can transmit light in the entire wavelength band collected by the optical system 2. In this specification, the ability to transmit light in the entire wavelength band is expressed as “transmits all light”.

  For example, as shown in FIG. 3, the mask state switching unit 5 includes a rail 5a disposed on the pupil plane A so as to intersect the optical axis S, and a slider 5b movable on the rail 5a. Yes. A first mask member 4a and a second mask member 4b are mounted on the slider 5b. By sliding the slider 5b on the rail 5a, the first mask member 4a and the second mask member 4b are moved in the direction intersecting the optical axis S, and are selected on the optical path of the pupil plane A of the optical system 2. It can be inserted and removed.

The operation of the endoscope apparatus 1 according to the present embodiment configured as described above will be described below.
When acquiring three-dimensional information (for example, distance information) using the endoscope apparatus 1 according to the present embodiment, the mask state switching unit 5 is operated and the first on the optical path of the pupil plane A of the optical system 2. The mask member 4a is disposed. Thereby, the light condensed by the optical system 2 is transmitted only through the first opening 9 and shields light other than the first opening. That is, the optical mask 8 is in the first state B.

At this time, the two first openings 9 are arranged so that the optical axis S of the optical system 2 coincides with the center thereof. Thereby, the light from the subject condensed by the optical system 2 is converted into light having different wavelength bands by the two wavelength selection filters 10 when passing through the first opening 9.
These lights reach the two-dimensional sensor 3 with a color filter and are photographed through the color filters having different transmission wavelength bands arranged in different pixels of the filter unit 7. It should be noted that the center position of the two first openings 9 and the optical axis S of the optical system 2 need only be substantially coincident. Even if the center position of the two first openings 9 and the position of the optical axis S of the optical system 2 do not completely match, information on how much they do not match is acquired in advance. If so, three-dimensional information can be acquired based on the information and the parallax information.

  As a result, when two types of light that have passed through the two first openings 9 and have different wavelength bands reach the filter unit 7, separate color filters having overlapping transmission wavelength bands, respectively. And enters the sensor unit 6. Since the pixels of the sensor unit 6 are arranged for each color filter, the two types of light are incident on the pixels corresponding to the same type of color filter, and by extracting the light intensity for each color filter, It can be acquired as two images.

  On the other hand, when acquiring a two-dimensional color image using the endoscope apparatus 1 according to the present embodiment, the mask state switching unit 5 is operated to place the first mask member on the optical path of the pupil plane A of the optical system 2. Instead of 4a, a second mask member 4b is arranged. Thereby, the light condensed by the optical system 2 is transmitted only through the second opening 11, and the second mask member 4b shields light other than the second opening. Therefore, the optical mask 8 is in the second state C where it does not transmit through the first opening 9.

  At this time, the optical axis S of the optical system 2 is aligned with the center of the second opening 11. Thereby, the light from the subject condensed by the optical system 2 passes through the second opening 11 and is photographed by the two-dimensional sensor 3 with a color filter. Since wavelength selection is not performed in the second aperture 11, the transmitted light is photographed by the two-dimensional sensor 3 with a color filter, so that all the color component lights necessary for constituting a color image are obtained. Can be obtained at the pixel. Since these lights pass through the same opening, they do not have parallax, and a two-dimensional color image can be easily obtained without performing a special combining process. It is sufficient that the center of the second opening 11 and the optical axis S of the optical system 2 substantially coincide.

  The light transmitted through the two first openings 9 at intervals in the direction intersecting the optical axis S is light emitted from the subject in different directions, and these are separated and photographed for each wavelength. Thus, two images having parallax can be acquired.

  That is, according to the endoscope apparatus 1 according to the present embodiment, the observation by the two-dimensional color image and the three-dimensional image can be performed only by arranging the first and second mask members 4a and 4b, which are the optical mask 8, on the optical path. There is an advantage that information acquisition can be easily switched. In this case, when acquiring a two-dimensional color image of a subject, it is not necessary to presume from a pair of images having parallax and to synthesize an image, and a two-dimensional color image can be easily and accurately generated. can do.

Next, an endoscope apparatus 12 according to a second embodiment will be described below with reference to the drawings.
In the description of the present embodiment, the same reference numerals are given to portions having the same configuration as the endoscope apparatus 1 according to the first embodiment described above, and the description thereof is omitted.

  As shown in FIGS. 4, 5, and 6, the endoscope apparatus 12 according to the present embodiment includes a mask member 13 and first and second shielding members 14 a and 14 b included in the mask state switching unit 5. The optical mask 15 is different from the optical mask 8 of the endoscope apparatus 1 according to the first embodiment in that the optical mask 15 is in the first and second states D and E.

  In the endoscope apparatus 12 according to the present embodiment, the mask state switching unit 5 causes the first and second shielding members 14a and 14b to be attached to the mask member 13 that is fixedly disposed on the optical path of the pupil plane A. The optical mask 15 is in the first and second states D and E by being selectively inserted into and removed from the optical path of the pupil plane A. That is, the first state D includes the mask portion 13 and the second shielding member 14b, and the second state E includes the mask member 13 and the first shielding member 14a.

  As shown in FIG. 6, the mask member 13 which is the optical mask 15 is a substantially flat plate member made of a light shielding material, and has a single second opening 11 penetrating in the thickness direction at the center. And two first openings 9 penetrating in the plate thickness direction at positions equidistant from the second opening 11 on both sides of the second opening 11 in the diameter direction. Two types of wavelength selection filters 10 having different transmission wavelength bands are individually disposed in the two first openings 9. The transmission wavelength band of each wavelength selection filter 10 overlaps the transmission wavelength band of any different filter unit 7 of the two-dimensional sensor 3 with the color filter. The mask member 13 is disposed at a position where the center of the second opening 11 coincides with the optical axis S of the optical system 2.

  The first shielding member 14a is a substantially flat plate member made of a material that shields light, and includes an opening 16 penetrating in the thickness direction at the center. The second shielding member 14b is also a substantially flat member made of a material that shields light, and includes an opening 17 that penetrates in the thickness direction at the same interval as the first opening 9 of the mask member 13. Yes. The openings 16 and 17 are through holes that can transmit light in the entire wavelength band collected by the optical system 2. The aperture 16 has a larger diameter than the second opening 11, and the opening 17 has a larger diameter than the first opening 9.

  The first shielding member 14 a is disposed at a position where the opening 16 coincides with the second opening 11, thereby closing the first opening 9 and passing only the light passing through the second opening 11. It is supposed to let you. Further, the second shielding member 14b is arranged so that the opening 17 thereof is located at a position corresponding to the first opening 9, thereby closing the second opening 11 and passing only the light passing through the first opening 9. Is supposed to pass through.

  As shown in FIG. 6, the first and second shielding means 14a and 14b are mounted on the slider 5b. By sliding the slider 5b on the rail 5a, the first and second shielding means 14a and 14b are moved in a direction intersecting the optical axis S, and are selectively inserted into and removed from the mask member 13. Can be done.

The operation of the endoscope apparatus 12 according to this embodiment configured as described above will be described below.
When acquiring three-dimensional information using the endoscope apparatus 12 according to the present embodiment, the mask member 13 fixed on the optical path of the pupil plane A of the optical system 2 by operating the mask state switching unit 5. 2nd shielding member 14b is arrange | positioned. Accordingly, since the second opening 11 is shielded by the second shielding member 14b, only the light passing through the first opening 9 among the light from the subject condensed by the optical system 2 is transmitted through the opening 17. Then, the first state D is transmitted through the first opening 9. At this time, the light is converted into light having different wavelength bands by the two wavelength selection filters 10.
These lights reach the two-dimensional sensor 3 with a color filter and are photographed through the color filters having different transmission wavelength bands arranged in different pixels of the filter unit 7.
That is, only this light is photographed by the two-dimensional sensor 3 with a color filter, and two images having parallax can be acquired.

On the other hand, when acquiring a two-dimensional color image using the endoscope apparatus 12 according to the present embodiment, the mask state switching unit 5 is operated and the second shielding member is placed on the optical path of the pupil plane A of the optical system 2. A first shielding member 14a is arranged instead of 14b. Thereby, since the first opening 9 is shielded by the first shielding member 14a, the light from the subject condensed by the optical system 2 is transmitted through the second opening 11 and the opening 16, and the first opening 9 is transmitted. In a second state E, the light does not pass through the opening 9. That is, these two different wavelength bands are photographed by the two-dimensional sensor 3 with a color filter, and a two-dimensional color image can be acquired.

  Thus, according to the endoscope apparatus 12 according to the present embodiment, the optical mask 15 can be switched between the first and second states D and E in a state where the mask member 13 is fixed on the optical path. Accordingly, the first opening 9 and the second opening 11 provided in the mask member 13 that transmits light necessary for two types of observation are fixed, so that the same type of observation can be reproduced with high accuracy. Can do.

  Further, since the apertures of the first and second shielding members 14a and 14b are larger than the aperture of the mask member 13, the mask state switching unit 5 is operated to operate the first and second shielding members 14a, Strict positioning is not necessary when inserting and removing 14b. That is, as long as the first opening 9 and the second opening 11 are included in the openings 16 and 17, the positioning accuracy is not affected, so that positioning can be performed easily.

Next, an endoscope apparatus 18 according to a third embodiment will be described below with reference to the drawings.
In the description of the present embodiment, the same reference numerals are given to portions having the same configuration as the endoscope apparatus 1 according to the first embodiment described above, and the description thereof is omitted.

  As shown in FIGS. 7, 8, and 9, the endoscope apparatus 18 according to the present embodiment selectively inserts and removes the first mask member 4 a that is the optical mask 19 by the mask state switching unit 5. Thus, the optical mask 19 is different from the optical mask 8 of the endoscope apparatus 1 according to the first embodiment in that the optical mask 19 is in the first and second states F and G.

  In the endoscope apparatus 18 according to the present embodiment, the first mask member 4a is selectively inserted into and removed from the optical path of the pupil plane A by the mask state switching unit 5, whereby the optical mask 19 is the first. And it will be in the 2nd states F and G. That is, in the first state F, the first mask member 4 a is arranged on the optical path of the pupil plane A, and the light incident on the two-dimensional sensor 3 with the color filter transmits only the first opening 9. In the second state G, since the first mask member 4a is not arranged on the optical path of the pupil plane A, the first opening 9 is not transmitted, the mask member 4 is not shielded, and all light is colored. The light enters the two-dimensional sensor 3 with a filter.

  As shown in FIG. 9, the mask state switching unit 5 has only the first mask member 4a mounted on the slider 5b. By sliding the slider 5b on the rail 5a, the first mask member 4a is mounted. Are moved in the direction intersecting the optical axis S, and can be inserted / removed alternatively.

The operation of the endoscope apparatus 18 according to the present embodiment configured as described above will be described below.
When acquiring three-dimensional information using the endoscope apparatus 18 according to the present embodiment, the mask state switching unit 5 is operated so that the first mask member 4a is placed on the optical path of the pupil plane A of the optical system 2. Deploy. Thereby, the light from the subject condensed by the optical system 2 passes through only the first opening 9 and shields other than the first opening 9. That is, the optical mask 19 is in the first state F, and the light that has passed through the first opening 9 is simultaneously acquired as an image having parallax by separate pixels. Thereby, it is possible to acquire the three-dimensional information of the observation target.

  On the other hand, when acquiring a two-dimensional color image using the endoscope apparatus 18 according to the present embodiment, the mask state switching unit 5 is operated to start the first mask member from the optical path of the pupil plane A of the optical system 2. Move 4a. Thereby, the light from the subject condensed by the optical system 2 becomes the second state G in which the light is incident on the two-dimensional sensor 3 with a filter, and a two-dimensional color image can be acquired without performing pupil division. A two-dimensional color image can be easily obtained.

  In the endoscope apparatus 12 according to the present embodiment, as shown in FIG. 10, the first and second shielding members 20 a and 20 b are individually arranged with respect to the first opening 9 and the second opening 11. You may arrange in. In the example shown in FIG. 10, the first opening 9 and the second opening 11 are selectively made by the first and second shielding members 20 a and 20 b provided so as to be swingable around an axis parallel to the mask member 13. The optical mask 21 is in the first and second states H and I.

  Specifically, the first and second shielding members 20 a and 20 b are formed in a substantially flat plate shape having no opening by a material that blocks light, and the first and second shielding members 20 a as the mask state switching unit 5. , 20b are used to swing the motors 22a, 22b. When configuring the first state H, the motor 22a is operated to close the second opening 11 with the second shielding member 20b. When configuring the second state I, the motor 22b is operated to close the first opening 9 with the first shielding member 20a.

In this case, when the motors 22a and 22b are operated to swing the shielding members 20a and 20b, it is only necessary to close the first opening 9 or the second opening 11, and the first shielding member 20a. Strict positioning of the second shielding member 20b is not necessary.
In addition, the first shielding member 20a may be of a size that allows the first opening 9 and the second shielding member 20b to close the second opening 11 individually, and there is no need to provide a slide mechanism. The system 2 can be reduced in size.
The same effect can be obtained even when a liquid crystal shutter or the like is used as the shielding member.

  Moreover, you may provide the three-dimensional color conversion part 23 which isolate | separates the image information with parallax for every color component. A pseudo color image of a parallax image can be acquired, and stereoscopic observation can be performed using the acquired color image.

  The second opening 11 that transmits light when acquiring a two-dimensional color image is preferably larger than the aperture of the first opening 9 that transmits light when performing stereoscopic observation. Thereby, the spot diameter formed by the light passing through the second opening 11 condensed on the imaging unit can be made smaller than the spot diameter formed by the light passing through the first opening 9, There is an advantage that a two-dimensional color image with high resolution can be acquired.

  On the other hand, by reducing the diameter of the second opening 11, it is possible to obtain an image having parallax while reducing the distance between the centers of the two first openings 9, and increasing the diameter of the optical system 2. Can be prevented. When the openings are not circular, the distance between the centers of the two first openings 9 may be the distance between the center positions of the two first openings 9.

  In the first embodiment, it is preferable that the distance between the center of gravity positions of the first openings 9 of the first mask member 4 a is larger than the diameter of the second openings 11. Thereby, sufficient parallax for acquiring three-dimensional information can be secured in the two images obtained by photographing the light transmitted through the second opening 11.

In the above-described embodiment, the first and second states of the optical masks 8, 15, 19, and 21 are not limited to two types, and the numerical aperture and the transmission wavelength band of the wavelength selection filter 10 are not limited. Three or more different mask members may be provided.
Further, any arrangement, performance, and distance of the optical element 2a constituting the optical system 2 can be adopted. In order to improve the performance of the optical system 2, an aspheric lens may be used for the first surface.

  Moreover, the mask state switching part 5 is not limited to what is provided with the rail 5a and the slider 5b. For example, the mask members 4a and 4b are attached to a circular plane plate arranged on the pupil plane A so as to intersect the optical axis S, and the circular plane plate is rotated in the circumferential direction of the plane plate, so that the optical axis S and You may insert / remove the mask members 4a and 4b in the crossing position. Accordingly, a configuration in which the mask members 4a and 4b are selectively inserted into and removed from the optical path of the pupil plane A may be employed.

The following aspects are derived from the above embodiments.
One aspect of the present invention is an optical system that collects light from a subject, a two-dimensional sensor with a color filter that is disposed on an imaging surface of the optical system and photographs light collected by the optical system, An optical mask having two first openings arranged at intervals in a direction intersecting the optical axis, and two kinds of wavelength selective filters having different transmission wavelength bands arranged separately in the first opening. Then, the state of the optical mask is selected as a first state in which light incident on the two-dimensional sensor with a color filter is transmitted only through the first opening or a second state in which light is not transmitted through the first opening. An endoscopic device having a transmission wavelength band in which the two wavelength selection filters of the optical mask overlap with any one of the color filters of the two-dimensional sensor with the color filter. provide.

  According to this aspect, when the state of the optical mask is switched to the first state by the operation of the mask state switching unit, the light from the subject condensed by the optical system passes only through the first opening, It becomes light of a different wavelength band by the wavelength selection filter arranged in the opening. These lights reach the two-dimensional sensor with a color filter and are photographed through the color filters having different transmission wavelength bands arranged in different pixels of the color filter unit. That is, light that has passed through two openings arranged at intervals in a direction crossing the optical axis is simultaneously acquired as an image having parallax by separate pixels. Thereby, it is possible to acquire the three-dimensional information of the observation target.

  On the other hand, when the state of the optical mask is switched to the second state by the operation of the mask state switching unit, the light from the subject condensed by the optical system transmits the light in the entire wavelength band without passing through the first aperture. The light is incident on a two-dimensional sensor with a color filter and photographed. Thus, a two-dimensional color image can be acquired without performing pupil division. At this time, since conventional image synthesis is not required, a two-dimensional color image can be easily acquired.

  In the above aspect, the optical mask has a light shielding property, is disposed on a pupil plane of the optical system, and includes a single second opening that can transmit all light. In the second state, the state of the optical mask may be switched so that light input to the two-dimensional sensor with a color filter transmits only the second aperture on the pupil plane of the optical system.

  In this way, when the state of the optical mask is switched to the second state by the operation of the mask state switching unit, the light from the subject condensed by the optical system is changed to a single second of the optical mask. It passes through only the aperture and is photographed by a two-dimensional sensor with a color filter. Thereby, a two-dimensional color image can be acquired without performing pupil division, and a two-dimensional color image can be acquired easily and accurately.

  In the above aspect, the optical mask includes a first mask member having the first opening and a second mask member having the second opening, and the mask state switching unit includes the first mask member. Alternatively, the mask member or the second mask member may be inserted into and removed from the optical axis.

  By doing so, the first mask member or the second mask member can be alternatively arranged on the optical axis of the optical system by the mask state switching unit. Thereby, the light from the subject condensed by the optical system passes through the first opening or the second opening, and is shielded by the mask member at portions other than the opening. Therefore, a high-accuracy two-dimensional color image can be obtained by inserting the second mask member on the optical axis of the optical system, and the first mask member can be inserted instead of the three-dimensional information. Acquisition can be performed.

  In the above aspect, the optical mask includes a single mask member having the first opening and the second opening, and the mask member is fixed at a position that blocks the optical axis of the pupil plane of the optical system. The mask state switching unit includes a first shielding member capable of shielding the first opening, and a second shielding member capable of shielding the second opening, and the first shielding member and The second shielding member may alternatively be inserted / removed on the optical axis.

  By doing in this way, by the action | operation of a mask state switching part, a shielding member is moved, either 1st opening or 2nd opening is shielded, and it is set as the 1st state or the 2nd state, and by an optical system The light from the condensed subject can be selectively passed. At this time, since it is not necessary to move the single aperture of the mask member through which light passes and the wavelength selection filter itself, it is not necessary to worry about the positioning error of the aperture, and even if the observation method is switched, the accuracy is simply high. Images can be acquired.

In this case, there may be provided a three-dimensional color conversion unit that separates the image information obtained by the light transmitted through the first opening entering the two-dimensional sensor with a color filter for each color component. .
In this way, a pseudo color image of a parallax image can be acquired, and stereoscopic observation can be performed using the acquired color image.

Moreover, in the said aspect, the aperture diameter of the said 2nd opening may be larger than the aperture diameter of the said 1st opening.
By doing in this way, the spot diameter formed by the light passing through the second opening being condensed on the imaging unit can be made smaller than the spot diameter formed by the light passing through the first opening. And a high-resolution two-dimensional color image can be acquired.

  On the other hand, by reducing the size of the aperture of the second opening, it is possible to obtain image information having parallax while reducing the distance between the centers of the two first openings, thus preventing an increase in the diameter of the optical system, It is possible to prevent the optical system from becoming large.

Moreover, in the said aspect, the distance between the gravity center positions of the said 1st opening may be larger than the aperture diameter of the said 2nd opening.
By doing in this way, two images acquired by photographing the light transmitted through the wavelength selection filter with a two-dimensional sensor with a color filter can secure sufficient parallax for acquiring three-dimensional information.

1, 12, 18 Endoscope device 2 Optical system 3 Two-dimensional sensor with color filter 4, 13 Mask member 4a First mask member 4b Second mask member 5 Mask state switching unit 8, 15, 19, 21 Optical mask 9 1st opening 10 Wavelength selection filter 11 2nd opening 14a 1st shielding member 14b 2nd shielding member 23 3D color conversion part

Claims (7)

An optical system that collects light from the subject;
A two-dimensional sensor with a color filter, which is disposed on the imaging surface of the optical system and photographs light collected by the optical system;
An optical mask having two first openings arranged at intervals in a direction intersecting the optical axis, and two kinds of wavelength selective filters having different transmission wavelength bands arranged separately in the first opening. When,
The state of the optical mask is alternatively set to a first state where light incident on the two-dimensional sensor with a color filter is transmitted only through the first opening or a second state where light is not transmitted through the first opening. A mask state switching unit for switching to
An endoscope apparatus in which the two wavelength selection filters of the optical mask have a transmission wavelength band overlapping with any one of the color filters of the two-dimensional sensor with a color filter. The optical mask has a light shielding property, is disposed on a pupil plane of the optical system, and includes a single second opening that can transmit all light,
In the second state, the mask state switching unit is configured so that light input to the two-dimensional sensor with a color filter transmits only the second aperture on the pupil plane of the optical system. The endoscope apparatus according to claim 1 that switches between the two. The optical mask includes a first mask member having the first opening, and a second mask member having the second opening,
The endoscope apparatus according to claim 2, wherein the mask state switching unit selectively inserts and removes the first mask member or the second mask member on the optical axis. The optical mask comprises a single mask member having the first opening and the second opening;
The mask member is fixed at a position blocking the optical axis of the pupil plane A of the optical system;
The mask state switching unit includes a first shielding member capable of shielding the first opening, and a second shielding member capable of shielding the second opening,
The endoscope apparatus according to claim 2, wherein the first shielding member and the second shielding member are selectively inserted into and removed from the optical axis.   The light of the said 1st opening is provided with the three-dimensional color conversion part which isolate | separates the image information acquired when it injects into the said two-dimensional sensor with a color filter for every color component. The endoscope apparatus according to any one of the above.   The endoscope apparatus according to any one of claims 2 to 5, wherein a diameter of the second opening is larger than a diameter of the first opening. The endoscope apparatus according to claim 2 or 3, wherein a distance between the gravity center positions of the first opening is larger than a diameter of the second opening.

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