KR20110035192A - 3-d endoscope optical system - Google Patents

Abstract

PURPOSE: A three dimensional endoscope optical system is provided to easily control an optical axis and obtain a clear three dimensional image of an object by using a main lens. CONSTITUTION: A main lens collimates light from one point of an object in parallel in left and right sides. A relay lens(120) is formed on one side of the main lens and transmits the collimated left and right images in parallel. A focusing lens(130) is formed on one side of the relay lens and fixes or varies the left and right images which are transmitted from the relay lens in parallel. A CCD picks up the image transmitted from the focusing lens.

Description

Stereoscopic endoscope optical system {3-D endoscope optical system}

The present invention relates to a stereoscopic endoscope optical system, and in particular, by configuring the vertex lens, the relay lens, and the imaging lens unit in one set, it is easy to adjust the optical axis of the lens, and there is no fear of multi-view image rotation. It relates to a stereoscopic endoscope optical system.

In general, hospitals use endoscopes for medical examinations or surgery.

In such an endoscope, an optical system for photographing an object is necessarily applied.

The conventional stereoscopic endoscope optical system includes one objective lens for primary imaging an image of an object to be photographed, one relay lens for transmitting the first imaging image, and secondary imaging for an image transmitted through the relay lens. It consists of one imaging lens and a CCD, which is a left and right image pickup device for imaging the secondary imaged left and right images, and two objective lenses, two relay lenses, two imaging lenses and two CCDs. There is a structure composed of two objective lenses, one relay lens, two imaging lenses, and two CCDs.

However, in the conventional stereoscopic endoscope optical system, since a vergence lens for matching an image center to an object is not formed when an object located at a near distance is formed, the centers of the left and right images do not coincide with each other. There is a problem of falling sharpness.

The stereoscopic endoscope comprising the one objective lens, one relay lens, one imaging lens, and one CCD is formed on one side of the imaging lens to transmit and reflect an image to separate the left and right images. Since the refraction occurs due to reflection when the image is reflected by the rotation of the aperture, the image is shifted to form a different image in one camera.

In addition, there is a problem in that the inclination of the rotating unit must be adjusted to adjust the amount of movement of the image due to refraction.

And, in Real 3D, as shown in Figure 1 below, the position of the image where an object (green circle) forms on the CCD should be the same on the left and right images (located in the center) if the viewing angle is controlled. do.

However, the endoscope composed of one lens described above is not a stereoscopic image because only the position of the image where the object is formed on the CCD is moved as shown in Fig. 2 and the object and the background (red quadrangles) are moved to both sides in the same manner.

The stereoscopic endoscope consisting of the two objective lenses, the two or one relay lens, the two imaging lenses, and the two CCDs has a limitation of size because two sets of endoscopes enter the human body. It is difficult to adjust the optical axis of the lens and the two imaging lenses, the rotation of the image is easy to occur, and because of the two endoscope sets (set), there is a size constraint for insertion into the human body.

In the conventional stereoscopic endoscope optical system, only a binocular image is obtained, and a multiview image cannot be obtained.

Therefore, such a configuration is not a perfect stereoscopic, or there is a problem that only low-level stereoscopic images can be obtained.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to make the size of the endoscope optical system small and simple, to easily adjust the optical axis of the lens, and to obtain a multi-view stereoscopic image more than binocularly and clearly. It is to provide a stereoscopic endoscope optical system.

According to an aspect of the present invention, there is provided a stereoscopic endoscope optical system comprising: a viewing angle lens for collimating light rays emitted from one point of an object in parallel to left and right sides; A relay lens formed at one side of the vertex lens and transferring the left and right images collimated in parallel by the vertex lens in parallel; An imaging lens unit formed on one side of the relay lens and configured to fix or vary an image size of the left and right images transmitted in parallel from the relay lens; A CCD for capturing an image transmitted by the imaging lens unit; Characterized in that comprises a.

The imaging lens unit may include a fixed focus lens or a zoom lens.

An imaging lens unit comprising the zoom lens; a focusing lens for adjusting focus; a magnification converting lens for converting a magnification of a focused image; an aperture for time-divisionally passing left and right images in the same way; It is characterized in that it consists of a master lens to proceed to synthesize the image of the left and right transmitted separately separated by time division.

The diaphragm may include one of a first mask fixedly installed to determine an amount of exposure light, and a second mask or liquid crystal shutter configured to pass through the image one by one by time division while rotating.

The position of the vergence lens and the aperture stop may be formed to be in a mutually conjugate relationship.

The second mask is characterized in that a plurality of penetration holes are formed, such as binocular, four, eight.

In order to secure the same amount of light, the second mask may be divided into a portion having a wide transmission hole narrowly and a portion having a narrow transmission hole broadly divided.

The present invention also provides a stereoscopic endoscope optical system comprising: a vergence lens for collimating light rays emitted from one point of an object in parallel to left and right sides; A relay lens formed at one side of the vertex lens and transferring the left and right images collimated in parallel by the vertex lens in parallel; An imaging lens unit formed at one side of the relay lens and having a plurality of imaging lenses to fix or vary the size of the left and right images transmitted in parallel from the relay lens; A plurality of CCDs for respectively capturing an image transmitted through each of the imaging lenses of the imaging lens unit; Characterized in that comprises a.

The plurality of imaging lenses may be arranged in a horizontal multiview or horizontally and vertically.

As described above, the present invention has an effect of acquiring a clear three-dimensional image of an object to be photographed through a vertex lens that matches the center of the left and right images through the optical system of the endoscope when the object to be photographed is located at a short distance. have.

In addition, the present invention is easy to adjust the optical axis of the lens by forming a single lens, a relay lens, and an imaging lens all in one set, and comprises an aperture or liquid crystal shutter composed of a first mask and a second mask having a plurality of transmission holes Multiview images can be obtained more than both eyes, and there is no fear of rotating the multiview images, so that more excellent stereoscopic images can be obtained.

In addition, it is easy to replace the vergence lens and the relay lens inserted into the human body, there is an effect that can make the size of the endoscope of the endoscope small and simple.

Hereinafter, preferred embodiments of the stereoscopic endoscope optical system according to the present invention will be described in more detail with reference to the accompanying drawings.

Here, in all the drawings below, the components having the same functions are not repeated, using the same reference numerals, and the following terms are defined in consideration of functions in the present invention, which are inherently commonly used. It should be interpreted as meaning.

1 is a view schematically showing the overall configuration of a stereoscopic endoscope optical system according to a preferred embodiment of the present invention, Figure 2 is a view showing the aperture of the imaging lens unit according to the invention, Figure 3 is a stop according to the present invention The second mask is shown in another embodiment. 4A is a view illustrating a separated state of a first mask and a second mask of an aperture according to the present invention, and FIG. 4B is a view illustrating a coupled state of FIG. 4A.

As shown in FIGS. 1 to 4, the stereoscopic endoscope optical system 100 of the present invention is roughly divided into a vergence lens 110, a relay lens 120, and an imaging lens unit 130.

The viewing angle lens 110 is disposed in front of one side of the endoscope optical system 100 and is formed of a convex lens so as to easily determine or correct the left and right images emanating from the photographing object 200 in parallel. It is preferable.

That is, the left and right images (rays) emitted from the photographing object 200 proceed at different angles, but focus the image proceeding at different angles to the left and right sides as the vertex lens 110 is formed. Since it can be corrected to proceed in parallel with only, it plays the same role as controlling the viewing angle.

Accordingly, the left and right images from the photographing object 200 are collimated in parallel through the vertex lens 110.

In this case, when the position of the photographing object 200 is located at the front focal point of the vertex lens 110, the image emitted from the object 200 is collimated with perfect parallel light after passing through the vertex lens 110.

However, when the position of the object to be photographed 200 is not positioned at the front focal point of the vertex lens 110, after passing through the vertex lens 110, the light becomes divergent or converged light without becoming parallel light. Since the relay lens 120 transfers the state to the imaging lens unit 130 as it is, the focusing lens 131, which is a group of the imaging lens unit 130, moves back and forth to make the subsequent optical path the same, thereby making the image the same. Make a position at the image plane.

Here, the collimation means converted by focusing so that the left and right images (rays) that are reflected or refracted are processed in parallel (in a straight line).

As a result, a clear stereoscopic image of the object 200 may be obtained by easily matching the centers of the left and right images through the optical system of the endoscope when the object 200 is photographed at a short distance.

The relay lens 120 easily transfers (transmits) the left and right images of the photographing target object 200 which are arranged at a rear side of the vertex lens 110 at predetermined intervals and proceed in parallel. And a plurality of lenses.

Here, the relay lens 120 may adjust the length of the entire optical system by increasing or decreasing the number of lenses.

The imaging lens unit 130 is formed on one side of the relay lens 120 to fix or vary the size of the left and right images transmitted in parallel from the relay lens 120, and transmit time-divisionally and time-divisionally, respectively. It plays a role of synthesizing the transmitted image to form an image.

Here, the imaging lens unit 130 is preferably formed of a fixed focus lens for transmitting the size of the image in a fixed state or a zoom lens capable of varying the size of the image.

When the imaging lens unit 130 is formed of the zoom lens, the focusing lens 131 for focusing, the magnification converting lens 132 for converting the magnification of the focused image, and the left and right images in progress are the same. The aperture AS is configured to time-divisionally transmit left and right and the master lens 135 for synthesizing and synthesizing the left- and right-side images transmitted through time division respectively.

The diaphragm AS is made of one of a rotating disc or a liquid crystal shutter to transmit the left and right images one by one in time division alternately during rotation.

Here, the diaphragm AS made of the rotating disc includes a first mask 133 having a transmission hole 133a which is rotated as necessary by the motor M and is normally fixed, and one side of the first mask 133. A second mask 134 having a plurality of transmission holes 134a is formed to time-divisionally transmit an image that proceeds in close proximity.

The diaphragm AS has the penetration holes 133a and 134a of the first mask 133 and the second mask 134 coincident with each other when the second mask 134 is rotated by the motor M. FIG. Since the image is time-divisionally progressed only by transmission, the refraction phenomenon due to the reflection of the image does not occur, so that the image is applied to the CCD 140 clearly and without any shift.

In addition, the diaphragm AS may have a plate surface on which the image transmission hole 134a of the second mask 134 is formed at equal angles, or in order to secure the same amount of light, the outer circumferential portion is narrow and the inner circumferential portion may be widely adjusted. Can be configured.

The aperture AS is a first mask 133 having a transmission hole 133a for determining the size (amount of exposure light), and the left and right images are rotated by one rotation for 1 / 60th of a second, 4 o'clock or And a second mask 134 having a plurality of transmission holes 134a for photographing at 8 o'clock or the like.

Accordingly, when the plurality of penetrating holes 134a and the penetrating holes 133a of the first mask 133 coincide with each other by the periodic rotation operation of the second mask 134 of the aperture MD, the penetrating holes Images passing through 133a and 134a may be obtained time-divisionally.

Since the image acquired by passing through the aperture AS is synthesized while passing through the master lens 135, a stereoscopic image of the photographing object 200 located at a short distance is obtained better.

That is, the configuration of the diaphragm AS prevents the movement caused by the refraction of the image due to time-divided transmission rather than reflection, so that the resolution difference of the left and right images does not occur, and the multi-view image can be acquired more than the binocular image. Thus, more realistic and clear stereoscopic images can be realized.

In addition, the position of the diaphragm AS has a special relationship between the vertex lens 110 and the mutual conjugate (two points, two lines, or two numbers, etc.). It is formed so as to be in the relationship of the case where there is no change of the non-sphere. Accordingly, the image (rays) passing through the left and right sides of the vertex lens 110 is transferred to the aperture MD as it is, and is also separated into the left and right sides of the aperture AS.

The CCD (Charge-Coupled Device) 140 is formed on one side of the imaging lens unit 130 and converts the left and right images (rays) traveling through the imaging lens unit 130 into electric charges. As a sensor for obtaining a sensor, it is also called a charge coupling device.

The CCD 140 chip is a chip in which many photodiodes are collected. When light is emitted to each photodiode, electrons are generated according to the grains of light, that is, the amount of photon, and the amount of electrons of the photodiode represents the brightness of the light, thereby reconstructing this information to form image information.

In addition, the present invention synthesizes the image of the left and right through the master lens 135 into one, by using one CCD (140) as an image pickup device to eliminate the color difference between the left and right images Better image can be obtained.

The operation state of the present invention having the above-described structure will now be described.

First, when the near-field photographing target object 200 is photographed using an endoscope provided with an optical system according to the present invention, the left and right images (rays) emitted from one point of the photographing object 200 are the vertex lens 110. Collimated in parallel while passing through.

The left and right images, which collimate in parallel while passing through the vertex lens 110, are transmitted in parallel to the rear through the relay lens 120.

The left and right images passing through the relay lens 120 are incident on the imaging lens unit 130.

Subsequently, since the image incident on the imaging lens unit 130 is collimated perfectly in parallel by the vertex lens 110, the focusing lens 131 positioned in front of the imaging lens unit 130 is parallel to each other. After passing through the left and right images without moving forward and backward through the magnification conversion lens 132, the optical paths become the same and pass through the aperture AS.

In this case, the left and right images are separated while time-divisionally penetrating the transmission holes 133a and 134a of the first mask 133 and the second mask 134 of the aperture AS, and thus re-view both eyes or both eyes. An image is obtained.

Subsequently, the left and right images passing through the aperture AS are synthesized through the master lens 135 and imaged on one CCD 140.

Therefore, the stereoscopic endoscope optical system 100 of this configuration is easy to adjust the optical axis of the lens, and the image can be easily obtained because the vertex lens 110, the relay lens 120 and the imaging lens unit 130 are all one set. At the same time, there is no fear of image rotation, and thus superior stereoscopic images can be obtained.

On the other hand, Figure 5 is a view showing another embodiment of the present invention, which forms a plurality of master lenses 135 for synthesizing the image in the imaging lens unit 130 instead of one, the plurality of master lenses A multi-view image can be obtained by forming a plurality of CCDs 140 for capturing each image proceeding through the 135 as a multi-view.

The imaging lens unit 130 may be configured as a fixed focus lens to fix the size of the image, or may be configured as a zoom lens to vary the size of the image.

In addition, the imaging lens unit 130 including the zoom lens includes a focusing lens 131 for focusing, a magnification converting lens 132 for converting the magnification of the focused image, and the magnification converting lens 132. It consists of a plurality of master lenses 135 to pass through the image passing through at the same time to proceed to form a large number.

Here, the imaging lens unit 130 serves to transmit parallel light to parallel light, but has a function of simultaneously expanding the width of a beam (beam) in order to place a plurality of master lenses 135 at the rear portion.

In addition, the position of the imaging lens unit 130 is preferably to be a conjugate point with the vertex lens 110.

In addition, the plurality of master lenses 135 may be arranged in a horizontal multi-view or horizontally and vertically.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. And will be apparent to those skilled in the art to which the invention pertains.

1 is a view schematically showing the overall configuration of a stereoscopic optical system according to a preferred embodiment of the present invention.

2 is a view showing the aperture of the imaging lens unit according to the present invention.

3 is a view showing another embodiment of the second mask of the aperture according to the present invention.

4A is a view illustrating a separated state of a first mask and a second mask of an aperture according to the present invention.

FIG. 4B is a view illustrating a coupling state of FIG. 4A.

5 is a view showing another preferred embodiment of the stereoscopic endoscope optical system of the present invention.

[Description of Reference Numerals]

100: stereoscopic endoscope optical system 110: vision lens

120: relay lens 130: imaging lens unit

131: focusing lens 132: magnification conversion lens

133: first mask 134: second mask

133a, 134a: through hole M: motor

135: master lens 140: CCD

AS: Aperture stop 200: Object to be photographed

Claims (9)

In the stereoscopic optical system, A vergence lens for collimating light rays emitted from one point of the object in parallel to the left and the right; A relay lens formed at one side of the vertex lens and transferring the left and right images collimated in parallel by the vertex lens in parallel; An imaging lens unit formed on one side of the relay lens and configured to fix or vary an image size of the left and right images transmitted in parallel from the relay lens; A CCD for capturing an image transmitted by the imaging lens unit; Stereoscopic endoscope optical system characterized in that it comprises a. The stereoscopic endoscope optical system according to claim 1, wherein the imaging lens unit comprises a fixed focus lens or a zoom lens. The image forming lens unit of claim 2, wherein the imaging lens unit comprises a focusing lens for focusing, a magnification converting lens for converting the magnification of the focused image, and a left and right image in the same time-division manner. And a master lens for synthesizing the aperture and the left and right images respectively separated and transmitted separately in time division. The stereoscopic apparatus according to claim 3, wherein the stop is fixed to one of a first mask for determining an amount of exposure light and a second mask or a liquid crystal shutter for transmitting a time-divided image one by one during rotation. Endoscope optics. The stereoscopic endoscope optical system according to claim 1, 3 or 4, wherein the position of the vergence lens and the position of the aperture are formed so as to be in a mutually conjugate relationship. The stereoscopic endoscope optical system according to claim 4, wherein the second mask has a plurality of transmission holes such as binocular, four, and eight views. 7. The stereoscopic endoscope according to claim 4 or 6, wherein the second mask has a narrow width in which a portion having a wide transmission hole is narrowly divided, and a portion in which a narrow transmission hole is formed has a large width in order to secure the same amount of light. Optical system. In the stereoscopic optical system, A vergence lens for collimating light rays emitted from one point of the object in parallel to the left and the right; A relay lens formed at one side of the vertex lens and transferring the left and right images collimated in parallel by the vertex lens in parallel; An imaging lens unit formed at one side of the relay lens and having a plurality of imaging lenses to fix or vary the size of the left and right images transmitted in parallel from the relay lens; A plurality of CCDs for respectively capturing an image transmitted through each of the imaging lenses of the imaging lens unit; Stereoscopic endoscope optical system characterized in that it comprises a. The stereoscopic endoscope optical system of claim 8, wherein the plurality of imaging lenses are arranged in a horizontal multiview or horizontally and vertically.

Images