WO2011056012A2

WO2011056012A2 - Lens system for photographing stereoscopic images

Info

Publication number: WO2011056012A2
Application number: PCT/KR2010/007784
Authority: WO
Inventors: 정진호
Original assignee: Jung Jin Ho
Priority date: 2009-11-05
Filing date: 2010-11-05
Publication date: 2011-05-12
Also published as: KR101082382B1; KR20110049361A; WO2011056012A3

Abstract

The present invention relates to a lens system for photographing stereoscopic images, and particularly, to a lens system for photographing stereoscopic images which controls a convergence just by focusing without having to control the convergence, and which has a high resistance against vibrations and impacts, and in which left and right lenses are formed into a single lens instead of being separated from each other, and which enables images to be alternately transmitted in a time-division manner in order to obtain high-quality images with no difference in resolution. The lens system for photographing stereoscopic images comprises: an afocal lens unit which has an infinite focal length and which enables image light emitted by an object and incident to the left and right sides of the lens unit to advance as it is, in parallel; an iris which enables left and right images delivered from the afocal lens unit to be alternately transmitted, in a time-division manner, to the same left and right images; and a master lens unit which synthesizes the left and right images transmitted, in a time-division manner, from the iris so as to form a synthesized image.

Description

Stereoscopic image shooting lens system

The present invention relates to a three-dimensional image photographing lens system, in particular to serve to control the viewing angle by simply focusing without the need to control the viewing angle, and resistant to vibration and shock, without separating the left and right binocular lenses as a single lens The present invention relates to a stereoscopic image photographing lens system, which is configured to simultaneously transmit images in a time-divisionally alternating manner to obtain an excellent image having no difference in resolution.

At present, a lot of research is being carried out as we deeply recognize the importance of stereoscopic images both domestically and globally.

However, despite many studies, the direction of the research is mainly focused on the display, and there are not many studies on the stereoscopic imaging apparatus.

Ironically, the reason for this is that, unlike the recognition of the importance of stereoscopic images, the perception that stereoscopic imaging should use two lens systems simultaneously is prevalent.

However, when two lens systems are used, more problems occur in actual use than when one lens system is used.

That is, firstly, as shown in FIG. 1, the two lens systems 100 including the lens unit 120 and the lens system main body 110 are kept at the same distance as the human eye distance (approximately 65 mm) 130. There is a problem that is not easy to do.

Secondly, there is a problem in that the two lens systems 100 are not easily synchronized in a circuit.

Third, in terms of cost, the cost of the two lens systems 100 must be used, as well as additionally, it is not easy to operate the zoom lens and the focusing lens in the same way. There is a problem that is difficult to attach.

Fourth, when taking a close-up shot of the object 140, the angle of the two lens system 100 should be inclined inward, so it is difficult to accurately adjust the angle of the two lens system 100, and also to prevent the motor and the device (not shown) Since it must be attached separately, there is a problem that the size is very large.

Fifth, when the lens system is inclined toward the center to photograph the near object, keystone is generated, so-called vertical parallax in which the left and right images do not coincide.

Since the lenses that are actually HD for broadcast use have not been made for stereoscopic photography since they were first manufactured, the lens is thick (normally 95mm or more in outer diameter), and the lens system body is 1.5 times or more thicker than the eyepiece distance (65mm). By placing two lens systems 100 at a wider distance than), playing a close-up image gives a great burden to the eyes and it is not easy to make a smooth shooting by the large volume and heavy weight of the lens system.

Therefore, in order to solve the problems caused by the method of photographing stereoscopic images using the two lens systems 100 as described above, a stereoscopic image photographing lens system in which a binocular lens is formed in one lens system is partially developed.

That is, as shown in FIG. 2, the dual-focus double focusless adapter lens system 210 is attached to the camcorder 200.

However, in such a configuration, since the adapter must be designed without knowing the lens design performance of the camcorder sold previously, it cannot have sufficient resolution when combined with each other, and when shooting in a wide angle of view, the angle from the front of the camcorder lens is taken. It is difficult to maintain the binocular distance (65 mm) because of the increase.

In addition, since the position of the entrance pupil is changed when the focal length of the zoom lens mounted inside the camcorder 200 is changed, the zoom lens is required even in an adapter lens system composed of four groups of lenses L1, L2, L3, and L4. The exit pupil of the adapter lens system should be changed in response to the change in the incident pupil.

However, as the zoom lens zooms in, the incident incidence position changes. Since the adapter lens has a fixed position of the exit pupil, the adapter lens system does not compensate for this, resulting in a situation in which the angle of view is not sufficiently realized and the surroundings are dark.

In addition, since a beam splitter (combining two lights reflected on the mirrors M1, M2, and M3) is used to synthesize the light rays on the left and right sides of the zoom lens, only 50% of the light is used. As it can be used, the remaining 50% of the light is causing losses.

Therefore, there is a problem that only a low level stereoscopic image can be obtained with such a configuration.

In addition, the conventional stereoscopic image photographing lens system having a simple structure using one CCD in addition to the above-described configuration, the zoom lens 310 and the rear side of the zoom lens 310 to change the focal length, as shown in FIG. A first relay lens 320 for forming and transmitting the light traveling in parallel to the parallel light, a mirror 330 positioned at a rear side of the first relay lens 320 to change an optical path of left and right images, and the mirror An aperture 340 positioned at the rear side of the 330 to control an amount of light passing therethrough, a second relay lens 350 positioned at a rear side of the aperture 340, and the second relay lens. A color synthesizing prism 360 for separating the incident light into R, G, and B at the rear side of the 350 and a CCD 370 disposed at the rear of the color synthesizing prism 360 to form an image. do.

The stereoscopic image capturing lens system 300 having such a configuration is troublesome to change the viewing angle (angle of the optical axis for observing an object) by using the rotation of the mirror 330 on the optical axis of two lenses.

In addition, since the diaphragm 340 is configured to reflect and transmit the image light that proceeds, the diaphragm of the motor rotating the diaphragm 340 or the assembly of the rotating disc may cause shaking to cause the reflection not to be properly performed. In addition, there is a problem in that a difference in resolution between the left and right images occurs due to a decrease in resolution of the transmitted image light and the reflection image.

In addition, since the zoom lens 310 is fixed to the binocular spacing of 65mm, when zoomed in to photograph the near object, the binocular spacing cannot be adjusted narrowly, there is a disadvantage that the viewing angle should be changed by adding or using a separate configuration.

The present invention has been made to solve the above-described problems, and includes a single focusless lens unit, a diaphragm which transmits and separates light by time division alternately, and a master lens unit comprising a fixed focus lens or a zoom lens. By forming the three-dimensional image photographing lens system, it is not necessary to control the viewing angle, and it is simply configured as a single lens without separating the left and right binocular lenses, and the resolution difference between the left and right images due to the reflection of the mirror does not occur. The purpose is to provide.

According to an aspect of the present invention, there is provided a stereoscopic image photographing lens system comprising: an afocal lens unit having an infinite focal length for moving image light emitted from an object to left and right sides in parallel; An aperture for transmitting time-divisionally alternating left and right images transmitted from the afocal lens unit to left and right sides in the same manner; A master lens unit for synthesizing the left and right images transmitted through the time-division separately from the aperture to form an image; Characterized in that comprises a.

The afocal lens unit is characterized in that it is made of any one of a fixed or variable magnification lens system.

The master lens unit is characterized by consisting of a fixed focus lens or a zoom lens.

The diaphragm may be formed of any one of a flat plate shutter and a liquid crystal shutter.

The diaphragm comprising the flat plate shutter is fixedly installed, and includes a first mask configured to determine an exposure light amount and a second mask configured to time-divisionally enter an image during rotation one by one.

The first mask may be formed of any one of a rotary type which is rotated and fixed, or a slider type which can continuously open and close the through hole while the two flat blades slide horizontally.

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.

In front of the focus-free lens unit, a close-up lens is added for close-up photography.

The afocal lens unit may be any one of bending an optical path in a non-axial direction or bending an optical path in a coaxial direction in order to reduce the length.

The afocal lens unit forms a mirror between the first group lens and the second group lens, or forms a parabolic mirror instead of the first group lens, and between the parabolic mirror and the second group lens, in order to deflect the optical path in the off-axis. Forming a hyperbolic mirror or forming a mirror and a conical curved mirror between the first group lens and the second group lens, characterized in that any one.

In order to bend the optical path coaxially, the afocal lens unit forms a conical curved mirror instead of the second group lens or the third group lens, and forms a conical curved mirror on one side of the first group lens.

As described in detail above, the stereoscopic image photographing lens system of the present invention can be formed more simply, resistant to vibration and shock, and has an excellent effect of preventing a difference in resolution between left and right images.

In addition, the stereoscopic image photographing lens system of the present invention does not need to control the viewing angle, and it is possible to easily obtain a binocular viewpoint as well as a multiview image, and at the same time, there is no fear of image rotation, thereby obtaining a superior stereoscopic image It works.

1 is a schematic diagram showing a stereoscopic image capturing state using two conventional lens systems.

2 is a view showing the configuration of an optical system for stereoscopic imaging by a conventional bifocal adapter.

3 is a view illustrating an optical path and a configuration of a stereoscopic image capturing lens system for conventional stereoscopic image capturing.

4 is a view schematically showing the overall configuration of a three-dimensional imaging lens system according to an embodiment of the present invention.

5 is a view showing an aperture according to the present invention.

6 is a view illustrating another example of the second mask of the aperture according to the present invention.

7 is a view illustrating a separated state of the first mask and the second mask of the iris according to the present invention.

8 is a view showing a combined state of FIG.

9 is a view showing another embodiment of the first mask according to the present invention.

10 is a view showing a combined state of FIG.

FIG. 11 is a view illustrating an open / closed state according to the operation of FIG. 10.

12 is a view showing a first mask and a second mask made of a slider type.

FIG. 13 is a view illustrating an axial optical path of FIG. 4.

FIG. 14 is a view illustrating the non-axis optical path of FIG. 4. FIG.

15 is a view showing an embodiment of a structure capable of reducing the length of the afocal lens unit according to the present invention as a non-axis optical path.

FIG. 16 is a view showing a second embodiment of a structure capable of reducing the length of an afocal lens unit according to the present invention as a non-axis optical path.

FIG. 17 is a view illustrating a third embodiment of a structure capable of reducing the length of an afocal lens unit according to the present invention as a non-axis optical path.

18 is a diagram illustrating a coaxial optical path according to a fourth embodiment of a structure capable of reducing the length of an afocal lens unit according to the present invention.

Hereinafter, exemplary embodiments of a stereoscopic image photographing lens system according to the present invention will be described in 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.

As shown in FIGS. 4 to 14, the stereoscopic image capturing lens system 400 of the present invention is roughly divided into an afocal lens unit 410, an aperture 420, and a master lens unit 430.

The focusless lens unit 410 is disposed in front of one side of the stereoscopic imaging lens system 400 and is formed of the first group lens 411, the second group lens 412, and the third group lens 413. Alternatively, although not shown, the first group lens 411 and the second group lens 412 are formed, and the left and right images emitted from the object to be photographed are formed as convex lenses that can be focused so that they are transmitted as they are. It is preferable.

That is, the left and right images (rays) emitted from the object to be photographed proceed at different angles, but as the afocal lens unit 410 is formed, the images proceeding at different angles to the left and right sides are focused only. Since it can be corrected to proceed in parallel, it plays the same role as controlling the viewing angle.

Accordingly, the left and right images from the photographing object are focused through the focusless lens unit 410 and collimated in parallel.

At this time, when the position of the object to be photographed is located in the front focus of the afocal lens unit 410, the image emitted from the object passes through the afocal lens unit 410 and is collimated with perfectly parallel light. 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).

In addition, in order to photograph the proximity object, it is preferable to place a close up lens (not shown) in front of the afocal lens unit 410.

Accordingly, the stereoscopic image can be obtained by easily matching the centers of the left and right images to be taken when the object to be photographed is located at a short distance.

In addition, the focusless lens unit 410 may include a first group lens 411, a second group lens 412, a third group lens 413, or a first group lens 411 and a second group lens 412. It is preferable to use a lens system having a fixed magnification and a variable magnification so as to fix or adjust the focal length.

The size of the first group lens 411 is about 130mm diameter, it is preferable that the interval between the left and right image is 65mm.

The diaphragm 420 is composed of a flat plate shutter or a liquid crystal shutter to transmit the left and right images one by one in time division alternately during rotation.

Here, the diaphragm 420 made of the flat plate shutter has a transmission hole 421a for transmitting an image, and is rotated when necessary by the motor M, and is made of a rotating type that is normally fixed. A second mask 422 having a plurality of transmission holes 422a is formed to time-divisionally transmit an image that proceeds close to one side of the first mask 421.

The first mask 421 has two flat blades 421-1 and 421 having transmission holes 421-1a and 421-2a as shown in FIGS. 9 to 12 in addition to the rotation type. -2) and the flat blade (421-1), (421-) when the motor (M) is continuously rotated clockwise or counterclockwise at a predetermined angle by forming a housing having a motor (M) As 2) slides horizontally, the through holes 421-1a and 421-2a may be configured in a slider type capable of continuously opening or closing each other or all of them.

That is, the flat blades 421-1 and 421-2 are overlapped with each other more or less, while the through holes 421-1a and 421-2a close or open the mutual parts or the whole. The exposure amount of light is determined.

The shape and shape of the flat blades 421-1 and 421-2 having the penetrating holes 421-1a and 421-2a may be variously applied as necessary.

The diaphragm 420 having the above-described configuration includes the through

holes

421a and 422a of the first mask 421 and the second mask 422 when the second mask 422 is rotated by the motor M. FIG. Since the image is only time-divisionally transmitted through the transmission, the refraction phenomenon such as the beam splitter method does not occur so that the image is applied to the CCD 440 clearly and without any shift.

In addition, the diaphragm 420 may have a plate surface on which the image transmission hole 422a of the second mask 422 is formed is divided at equal angles, or the outer circumferential portion is narrow and the inner circumferential portion may be widely adjusted so as to secure the same amount of light. Can be configured.

The diaphragm 420 has a transmission hole 421a for determining the size (exposure light amount), and the transmission hole 421-1a for determining the amount of rotational or exposure light that is rotated as necessary by the motor M and is normally fixed. A first mask 421 made of a slider type capable of continuously opening and closing the through-holes while the two flat blades 421-1 and 421-2 having 421-2a slide horizontally; It consists of a second mask 422 having a plurality of transmission holes 422a which allow the left and right images to be photographed at binocular, four or eight o'clock, etc. while rotating one minute for one second.

Accordingly, the plurality of transmission holes 422a and the transmission holes 421a or the flat blade wings 421-of the first mask 421 that are opened by the periodic rotation operation of the second mask 422 of the aperture 420. When the open through holes 421-2a of 2) coincide with each other, the through holes 421a or the through holes 421-2a and the image passing through the through holes 422a may be obtained time-divisionally. .

Since the image obtained by passing through the aperture 420 is synthesized while passing through the master lens 430, the stereoscopic image of the object to be photographed is obtained better.

That is, since the configuration of the diaphragm 420 is alternately transmitted in a time-divisional manner instead of the reflection, since the movement of the image light is refracted by the driving of a motor during the conventional light reflection, a difference in resolution of left and right images occurs. In addition, multi-view images can be acquired more than binocular images, thereby realizing more realistic and clear stereoscopic images.

The master lens unit 430 is formed at one side of the aperture 420 and serves to synthesize the left and right images transmitted from the aperture 420 to form an image.

Here, the master lens unit 430 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.

The CCD (Charge-Coupled Device) 440 is formed on one side of the master lens unit 430 to convert the left and right images (rays) traveling through the master lens unit 430 into electric charges to obtain an image. The internal sensor is also called a charge coupled device.

The CCD 440 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 left and right images proceeding through the master lens unit 430 into one, and is picked up using one CCD 440, which is an image pickup device, thereby eliminating color differences between the left and right images. You can get a better image.

Referring to the working state of the present invention configured as described above are as follows.

First, when photographing using a projector provided with a three-dimensional image pickup lens system according to the present invention, the left and right images (rays) emitted from one point of the object is collimated in parallel while passing through the afocal lens unit 410.

The left and right images collimated in parallel while passing through the afocal lens unit 410 are transmitted with a parallax rearward through the aperture 420.

At this time, the left and right images are separated while time-divisionally penetrating the

penetration holes

421a and 422a of the first mask 421 and the second mask 422 of the iris 420, and a multi-view of both eyes or both eyes. An image is obtained.

The left and right images passing through the diaphragm 420 are incident on the master lens unit 430, are synthesized while passing through the aperture 420, and are formed on one CCD 440.

Therefore, since the stereoscopic image capturing lens system 400 of this configuration includes both the afocal lens unit 410, the aperture 420, and the master lens unit 430 in one set, the viewing angle is adjusted only by focusing the lens to facilitate an image. At the same time, there is no fear of image rotation, and thus superior stereoscopic images can be obtained.

On the other hand, Figure 15 is a view showing an embodiment of the afocal lens unit according to the present invention, which is the afocal lens 410 or the first group lens 411 and the second group lens 412 Mirror between the first group lens 411 and the second group lens 412 of the focusless lens 410 composed of the group lens 411 and the second group lens 412 and the third group lens 413. By forming the

light paths

415 and 416 so that the optical path is bent by the axis, the length of the afocal lens unit 410 is reduced so that the overall size can be made more compact.

FIG. 16 is a view illustrating two embodiments of an afocal lens unit according to the present invention, which is an afocal lens 410 or a first group lens including a first group lens 411 and a second group lens 412. A parabolic mirror 411a is formed in place of the first group lens 411 of the afocal lens 410 including the 411 and the second group lens 412 and the third group lens 413. By forming a hyperbolic mirror 417 between the 411a and the second group lens 412 so that the optical path is bent by the axis, the length of the afocal lens unit 410 is reduced so that the overall size can be seen. It is intended to be compact.

Here, a parabolic mirror 411a is formed in place of the first group lens 411, and a hyperbolic mirror 417 is formed between the parabolic mirror 411a and the second group lens 412 so that the afocal lens unit is formed. In case of making 410, an additional lens may be used for aberration correction.

FIG. 17 is a view illustrating three embodiments of an afocal lens unit according to the present invention, which is an afocal lens 410 or a first group lens including a first group lens 411 and a second group lens 412. Mirror 415 between the first group lens 411 and the second group lens 412 of the afocal lens 410 consisting of 411 and the second group lens 412 and the third group lens 413. ) And a conical curved mirror 418 to allow the optical path to be bent by the axis to proceed, thereby reducing the length of the afocal lens unit 410 to make the overall size more compact.

FIG. 18 is a view illustrating four embodiments of an afocal lens unit according to the present invention, which is instead of the second group lens 412 or the third group lens 413 formed on one side of the first group lens 411. A conical curved mirror 412a is formed in the conical curved mirror 412b, and a conical curved mirror 412b is formed on one side of the first group lens 411 so that the optical path is bent coaxially on the coaxial axis. The length of the 410 is reduced so that the overall size can be made more compact.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various changes, modifications, and equivalent changes to other embodiments may be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art to which the invention pertains.

The stereoscopic image photographing lens system of the present invention may be used not only for general stereoscopic imaging, but also for HD broadcasting stereoscopic lenses.

Stereoscopic image, focusing, focusless, visual angle, time division

Claims

In the three-dimensional imaging lens system,

An afocal lens unit having an infinite focal length for advancing the image light emitted from the object to the left and right in parallel;

An aperture for time-divisionally transmitting left and right images transmitted from the afocal lens unit to the left and right sides in the same manner;

A master lens unit for synthesizing the left and right images transmitted through the time-division separately from the aperture to form an image; Stereoscopic imaging lens system comprising a.
The stereoscopic image photographing lens system of claim 1, wherein the afocal lens unit comprises one of a fixed magnification and a variable magnification lens system.
The stereoscopic image photographing lens system of claim 1, wherein the master lens unit comprises a fixed focus lens or a zoom lens.
The stereoscopic image photographing lens system of claim 1, wherein the aperture is one of a flat plate shutter and a liquid crystal shutter.
The stereoscopic image photographing according to claim 4, wherein the diaphragm including the flat plate shutter comprises a first mask fixedly installed to determine the exposure light amount, and a second mask for time-divisionally entering the rotating image one by one. Lens system.
The stereoscopic image photographing lens system of claim 5, wherein the first mask is any one of a rotating type which is rotated and fixed, or a slider type which can open and close the through hole continuously while the two flat blades slide horizontally. .
The stereoscopic image photographing lens system of claim 5, wherein the second mask has a plurality of transmission holes such as binocular, four, and eight views.
The stereoscopic image photographing lens system of claim 7, wherein the second mask is divided into a wide portion of the second through hole to have the same amount of light, and a wide portion of the second mask from the narrow portion of the second mask into a width of the second mask.
The stereoscopic image photographing lens system of claim 1, wherein a close-up lens is added to the front of the afocal lens unit for close-up photography.
The stereoscopic image photographing lens system of claim 1 or 2, wherein the afocal lens unit comprises any one of bending an optical path in a non-axial direction or bending an optical path in a coaxial direction in order to reduce the length.
The method of claim 10, wherein the afocal lens unit to form a mirror between the first group lens and the second group lens, or to form a parabolic mirror instead of the first group lens in order to bend the optical path in the stockpile and the parabolic mirror and the second 3. The stereoscopic image photographing lens system of claim 1, wherein the hyperbolic mirror is formed between the group lenses, or the mirror and the conical mirror are formed between the first group lens and the second group lens.
The method of claim 10, wherein the afocal lens unit to form a conical curved mirror instead of the second group lens or the third group lens in order to bend the optical path coaxially, and to form a conical curved mirror to one side of the first group lens Stereoscopic imaging lens system characterized in that.