WO2013157249A1 - 投写用レンズおよび投写型表示装置 - Google Patents
投写用レンズおよび投写型表示装置 Download PDFInfo
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- WO2013157249A1 WO2013157249A1 PCT/JP2013/002560 JP2013002560W WO2013157249A1 WO 2013157249 A1 WO2013157249 A1 WO 2013157249A1 JP 2013002560 W JP2013002560 W JP 2013002560W WO 2013157249 A1 WO2013157249 A1 WO 2013157249A1
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- lens
- projection
- projection lens
- conditional expression
- following conditional
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
- G02B27/1026—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with reflective spatial light modulators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/317—Convergence or focusing systems
Definitions
- the present invention relates to a projection lens and a projection display device, for example, a projection lens that can be suitably used for enlarging and projecting a light beam having image information from a light valve on a screen, and a projection display using the projection lens It relates to the device.
- Known light valves that perform light modulation include transmissive and reflective liquid crystal display elements, DMD (digital micromirror device: registered trademark) elements in which micromirrors are regularly arranged, and the like.
- DMD digital micromirror device: registered trademark
- a projection display device using such a light valve is required to be convenient, easy to install, small, lightweight, and bright (small F number). Therefore, a projection lens mounted on a projection display device is also required to have a wide angle, a small size, a light weight, a small F number, a low price, and a small number of constituent lenses.
- Patent Document 1 describes a six-lens lens system in which positive, positive, negative, negative, positive, and positive lenses are arranged in this order from the enlargement side.
- Patent Documents 2 and 3 describe a six-lens lens system in which positive, negative, negative, positive, positive, and positive lenses are arranged in this order from the enlargement side.
- Patent Document 4 describes, as Example 8, a six-lens lens system in which positive, negative, positive, negative, positive, and positive lenses are arranged in order from the enlargement side.
- Patent Documents 1 and 2 has a large F number of 4.0 and a total angle of view within a range of 22 degrees to 34 degrees, and does not support widening.
- Patent Document 3 describes a lens system having an F-number as small as 1.7, but the total angle of view is 32 degrees, which does not correspond to widening of the angle.
- the F number is 2.1 and the total angle of view is about 60 degrees, but the total length of the lens system is long, and correction of distortion and lateral chromatic aberration is insufficient.
- the present invention has been made in view of the above circumstances, and has a small number of constituent lenses, such as six, but has a small F number, a wide angle, various aberrations are well-balanced and well corrected, and has a high performance. It is an object of the present invention to provide a lightweight projection lens and a projection display device using the same.
- the projection lens of the present invention includes, in order from the magnification side, a first lens having a negative refractive power with a concave surface facing the reduction side, a second lens having a positive refractive power with a concave surface facing the reduction side, and magnification A third lens having negative refractive power with the concave surface facing side, a fourth lens having positive refractive power with the convex surface facing the reduction side, a fifth lens having positive refractive power, and a positive refractive power And a sixth lens having substantially the same, and the reduction side is telecentric, and satisfies the following conditional expressions (1) and (2).
- conditional expression (3) it is preferable to satisfy the following conditional expression (3), and it is more preferable to satisfy the following conditional expression (3 ′).
- conditional expression (3) 0.5 ⁇ Bf / f ⁇ 2.0 (3) 0.5 ⁇ Bf / f ⁇ 1.5 (3 ′)
- Bf Back focus of the entire system (air equivalent distance)
- conditional expression (6) it is preferable to satisfy the following conditional expression (6), and it is more preferable to satisfy the following conditional expression (6 ′).
- conditional expression (6 ′) 1.0 ⁇ f2 / f ⁇ 2.5 (6) 1.1 ⁇ f2 / f ⁇ 2.0 (6 ′)
- f2 focal length of the second lens
- the third lens and the fourth lens are cemented.
- At least one of the lens surfaces of the first lens and the sixth lens is an aspherical surface.
- the projection display device is described above as a light source, a light valve on which light from the light source is incident, and a projection lens that projects an optical image by light modulated by the light valve onto a screen.
- the projection lens of the present invention is provided.
- the “enlargement side” means the projection side (screen side), and the screen side is also referred to as the enlargement side for the sake of convenience when performing reduced projection.
- the “reduction side” means the original image display area side (light valve side), and the light valve side is also referred to as the reduction side for the sake of convenience when performing reduced projection.
- the surface shape, refractive power (power), and radius of curvature of the lens are considered in the paraxial region when an aspheric surface is included.
- substantially consisting of means optical components other than lenses such as lenses, diaphragms, masks, cover glasses, filters, etc. that have substantially no power other than the six lenses listed as constituent elements. It is intended that an element, a lens flange, a lens barrel, a mechanism portion such as a camera shake correction mechanism, and the like may be included.
- the reduction side is telecentric means that the bisector of the upper maximum ray and the lower maximum ray is parallel to the optical axis in the cross section of the light beam condensed at an arbitrary point on the reduction side image plane.
- This is not limited to the case where the distance is completely telecentric, that is, the case where the bisector is completely parallel to the optical axis, and there is some error (with respect to the optical axis).
- the case where there is some error is the case where there is a slight inclination with respect to the optical axis
- the inclination of the bisector with respect to the optical axis is within a range of ⁇ 4 °.
- the “surface power” is expressed as (n2 ⁇ n1) / r, where r is the radius of curvature of a surface and n1 and n2 are the refractive indices of the medium on the enlargement side and the reduction side of the surface, respectively. Is.
- the “back focus” is the distance on the optical axis from the lens surface on the most reduction side to the paraxial focal plane on the reduction side.
- the enlargement side and the reduction side are considered as the front side and the back side, respectively.
- the sign of the radius of curvature is positive when the surface shape is convex on the enlargement side and negative when the surface shape is convex on the reduction side.
- the power array is suitably set so that the negative, positive, negative, positive, positive, and positive lenses are arranged in order from the magnification side, and the shapes of the first lens to the fourth lens are preferably set.
- the F number is small, wide angle, and various aberrations are well corrected in a well-balanced manner while the number of lenses is as small as six.
- a high-performance, small and lightweight projection lens can be realized.
- the projection display device of the present invention uses the projection lens of the present invention, it can be configured to be bright, wide-angle, high performance, small and light.
- Sectional drawing which shows the lens structure of the projection lens of Example 1 of this invention 1 is a schematic configuration diagram of a projection display device according to an embodiment of the present invention.
- 1 is a schematic configuration diagram of a projection display device according to an embodiment of the present invention.
- 1 is a schematic configuration diagram of a projection display device according to an embodiment of the present invention.
- 6A to 6D are aberration diagrams of the projection lens according to Example 1 of the present invention.
- 8A to 8D are graphs showing aberrations of the projection lens according to Example 2 of the present invention.
- 10A to 10D are aberration diagrams of the projection lens according to Example 3 of the present invention.
- FIG. 1 is a cross-sectional view of a projection lens according to an embodiment of the present invention in a cross section including the optical axis Z.
- the configuration example shown in FIG. 1 corresponds to a projection lens of Example 1 described later.
- Reference numerals R1 to R14 in FIG. 1 will be described later in the description of the embodiment.
- This projection lens is composed of six lenses, a first lens L1 to a sixth lens L6.
- This projection lens is mounted on, for example, a projection display device, and can be used as a projection lens that projects image information displayed on a light valve onto a screen.
- a projection display device assuming that the left side of the drawing is an enlargement side and the right side is a reduction side and is mounted on a projection display device, an optical member 2 in the form of a plane parallel plate assuming various filters, cover glasses, and the like, The image display surface 1 of the light valve is also shown.
- FIG. 1 shows an example in which the position of the reduction side surface of the optical member 2 and the position of the image display surface 1 coincide with each other, the present invention is not necessarily limited thereto. Further, FIG. 1 shows only one image display surface 1, but in a projection display device, a light beam from a light source is separated into three primary colors by a color separation optical system, and three light sources for each primary color are used. A light valve may be provided so that a full-color image can be displayed.
- a light beam given image information on the image display surface 1 is incident on the projection lens via the optical member 2 and is arranged on the left side of the paper surface by the projection lens ( (Not shown).
- the projection lens of this embodiment includes, in order from the magnification side, a first lens L1 having a negative refractive power with a concave surface facing the reduction side, and a second lens L2 having a positive refractive power with a concave surface facing the reduction side.
- the sixth lens L6 having positive refractive power are arranged so that the reduction side is telecentric.
- the first lens L1 which is the most magnified lens is a negative lens, and three positive lenses are arranged on the reduction side, so that it becomes a retrofocus type optical system and ensures a long back focus while widening the angle. Can do. Also, it is advantageous for widening the angle by making the surface on the reduction side of the first lens L1 concave.
- the reduction side surface of the second lens L2 and the enlargement side surface of the third lens L3 are both concave surfaces, and these two concave surfaces are opposed to each other, so that the field curvature and spherical aberration can be corrected well to reduce the F-number. This is advantageous for realizing an optical system.
- the diaphragm 3 is arranged between the second lens L2 and the third lens L3. By disposing the aperture stop 3 at this position, it is advantageous to realize a small optical system with a small F number while ensuring good telecentricity.
- the diaphragm 3 may be a fixed diaphragm having a fixed aperture diameter or a variable diaphragm having a variable aperture diameter.
- the fourth lens L4 has a reduction-side surface as a convex surface, and the first to third lenses (lenses L4, L5, and L6) from the reduction side are positive lenses. It is possible to realize an optical system having a small F-number by properly correcting various aberrations while securing the properties.
- the negative meniscus first lens L1 having a concave surface on the reduction side in the paraxial region and the positive lens having the concave surface on the reduction side.
- a second lens L2 made of a meniscus lens, a third lens L3 made of a biconcave lens, a fourth lens L4 made of a biconvex lens, a fifth lens L5 made of a biconvex lens, and a biconvex sixth lens in the paraxial region.
- Six lenses L6 are arranged.
- the third lens L3 and the fourth lens L4 are preferably joined as in the example shown in FIG.
- chromatic aberration particularly axial chromatic aberration
- At least one of the lens surfaces of the first lens L1 and the sixth lens L6 is an aspherical surface. The reason is that the lens on the most magnified side and the lens on the most reduced side have a high ray height, and the on-axis light beam and the off-axis light beam are separated. Therefore, aberration correction can be effectively performed by utilizing an aspheric surface. This is because it is advantageous for realizing a high-performance optical system with a small number and a wide angle.
- the projection lens according to this embodiment is configured to satisfy the following conditional expressions (1) and (2). ⁇ 3.0 ⁇ 1 / (P4 ⁇ f) ⁇ ⁇ 0.4 (1) ⁇ 2.0 ⁇ 1 / (P5 ⁇ f) ⁇ ⁇ 0.2 (2)
- P4 power on the reduction side surface of the second lens
- P5 power on the enlargement side surface of the third lens f: focal length of the entire system
- the power of the two concave surfaces facing each other that is, the concave surface on the reduction side of the second lens L2 and the concave surface on the magnification side of the third lens L3 is suitable.
- conditional expression (1) If the lower limit of conditional expression (1) is not reached, the power of the reduction side surface of the second lens L2 becomes weak, and if the power of the reduction side surface of the second lens L2 is weak, the high performance is maintained. The overall length of the lens system, particularly the length in the optical axis direction, is increased. If the upper limit of conditional expression (1) is exceeded, it will be difficult to satisfactorily correct aberration correction, particularly field curvature.
- conditional expression (1 ′) is satisfied instead of conditional expression (1) for further downsizing and better aberration correction.
- conditional expression (2) If the lower limit of conditional expression (2) is not reached, the power on the enlargement side surface of the third lens L3 becomes weak, and if the power on the enlargement side surface of the third lens L3 is weak, an attempt is made to maintain high performance.
- the overall length of the lens system particularly the length in the optical axis direction, is increased. If the upper limit of conditional expression (2) is exceeded, it will be difficult to satisfactorily correct aberration correction, particularly field curvature.
- conditional expression (2) is satisfied instead of conditional expression (2) for further miniaturization and better aberration correction. ⁇ 1.5 ⁇ 1 / (P5 ⁇ f) ⁇ ⁇ 0.3 (2 ′)
- the projection lens of the present embodiment satisfies any one of the following conditional expressions (3) to (7) or any combination.
- Bf Back focus of the entire system (air equivalent distance)
- f focal length of entire system
- D distance on the optical axis from the lens surface on the enlargement side of the first lens to the lens surface on the reduction side of the sixth lens
- the radius of curvature f2 of the reduction side surface of the second lens focal length ⁇ d2 of the second lens: Abbe number of the second lens with respect to the d-line
- Conditional expression (3) relates to back focus. If the lower limit of conditional expression (3) is not reached, it will be difficult to arrange the color composition member, separation member, etc. on the reduction side of the projection lens. If the upper limit of conditional expression (3) is exceeded, the lens diameter on the reduction side is increased, the length of the lens system in the optical axis direction is increased, and the entire lens system is increased in size.
- conditional expression (3) 0.5 ⁇ Bf / f ⁇ 1.5
- Conditional expression (4) relates to the total thickness of the lens system. If the lower limit of conditional expression (4) is not reached, it will be difficult to satisfactorily correct aberration correction, particularly field curvature. When the upper limit of conditional expression (4) is exceeded, the length of the lens system in the optical axis direction becomes long, and the entire lens system becomes large.
- conditional expression (4 ′) is satisfied instead of conditional expression (4) for further miniaturization and better aberration correction.
- Conditional expression (5) relates to the power balance between the enlargement side surface and the reduction side surface of the second lens L2. Even if the lower limit of conditional expression (5) is exceeded or the upper limit is exceeded, it becomes difficult to correct the field curvature well and to make the entire lens system compact.
- conditional expression (5 ′) is satisfied instead of conditional expression (5) for further downsizing and better aberration correction.
- Conditional expression (6) relates to the power ratio of the second lens L2 with respect to the entire system. If the lower limit of conditional expression (6) is not reached, it will be difficult to satisfactorily correct spherical aberration and to ensure back focus. If the upper limit of conditional expression (6) is exceeded, the diameters of the enlargement side lenses such as the first lens L1 and the second lens L2 become large, which is contrary to miniaturization and weight reduction.
- conditional expression (6 ′) instead of conditional expression (6) for better aberration correction and further reduction in size and weight.
- Conditional expression (7) relates to the dispersion characteristics of the material of the second lens L2. If the upper limit of conditional expression (7) is exceeded, it will be difficult to satisfactorily correct chromatic aberration.
- the preferable structure mentioned above is selectively adopted suitably according to the matter desired for the projection lens.
- a small F number for example, an F number smaller than 1.8
- a wide angle for example, full image
- the projection lens of this embodiment is small and light, it can be suitably used for, for example, a palm-sized projection display device.
- FIG. 2 relates to a single-plate projection display device that modulates with one light valve
- the examples shown in FIGS. 3 to 5 use three light valves for R light, G light, and B light.
- the present invention relates to a three-plate projection display device that performs modulation for each light.
- FIG. 2 is a configuration diagram showing a schematic configuration of the projection display apparatus 100 according to the embodiment of the present invention.
- the projection display device 100 includes a light source 20, an illumination optical unit 30, a reflective liquid crystal display element 101 as a light valve, a polarization separation prism 115, and a projection lens 10 according to an embodiment of the present invention. .
- the illumination optical unit 30 includes a fly-eye integrator 5 composed of fly-eye lenses 5a and 5b for uniformizing illumination light, and a polarization conversion element for emitting one of two linearly polarized lights whose vibration planes are orthogonal to each other. 6 and a condenser lens 7 including lenses 7a and 7b.
- the light from the light source 20 passes through the fly eye integrator 5 and then enters the polarization conversion element 6.
- the vibration plane of light is converted into linearly polarized light (P-polarized light or S-polarized light) in a predetermined direction by the polarization conversion element 6.
- the light is collimated by the condenser lens 7 and enters the polarization separation prism 115, is reflected by the reflection surface inside the polarization separation prism 115, enters the reflective liquid crystal display element 101, and is light-modulated for polarization separation.
- the light After passing through the prism 115, the light enters the projection lens 10.
- the projection lens 10 projects an optical image of light modulated by the reflective liquid crystal display element 101 on a screen (not shown).
- the configuration example shown in FIG. 1 is used as the projection lens 10, but another configuration example may be used as long as it is a projection lens according to an embodiment of the present invention.
- the projection lens used in the projection display devices 200 to 400 of the embodiments described below is not limited to the configuration example shown in FIG. 1, and any projection lens according to the embodiment of the present invention can be used. .
- FIG. 3 is a configuration diagram showing a schematic configuration of a projection display apparatus 200 according to another embodiment of the present invention.
- the projection display device 200 includes a light source 20, an illumination optical unit 30, reflective liquid crystal display elements 201a to 201c as light valves corresponding to each color light, dichroic mirrors 12 and 13 for color separation, A cross dichroic prism 214 for synthesis, polarization separation prisms 215a to 215c, a total reflection mirror 16 for optical path deflection, and a projection lens 10 according to an embodiment of the present invention are provided.
- the illumination optical unit 30 and the projection lens 10 are schematically shown.
- the white light from the light source 20 passes through the illumination optical unit 30 and is then decomposed into three colored light beams (G light, B light, and R light) by the dichroic mirrors 12 and 13.
- the separated color light beams pass through the polarization separation prisms 215a to 215c, enter the corresponding reflective liquid crystal display elements 201a to 201c, and are light-modulated, and are color-synthesized by the cross dichroic prism 214.
- the light enters the projection lens 10.
- the projection lens 10 projects an optical image of light modulated by the reflective liquid crystal display elements 201a to 201c on a screen (not shown).
- FIG. 4 is a configuration diagram showing a schematic configuration of a projection display apparatus 300 according to another embodiment of the present invention.
- the projection display device 300 includes a light source 20, an illumination optical unit 30, DMD elements 301a to 301c as light valves corresponding to each color light, and a TIR (Total Internal Reflection) prism 317a for color separation and color synthesis. 317c, a TIR prism 315 that separates illumination light and projection light, and a projection lens 10 according to an embodiment of the present invention.
- the illumination optical unit 30 and the projection lens 10 are schematically shown.
- the white light from the light source 20 is reflected by the reflecting surface inside the TIR prism 315 via the illumination optical unit 30, and then three colored light beams (G light, G light, and TIR prisms 317 a to 317 c). B light, R light).
- the separated color light beams are incident on the corresponding DMD elements 301a to 301c to be light-modulated, proceed again in the reverse direction through the TIR prisms 317a to 317c, and are color-synthesized, then pass through the TIR prism 315,
- the light enters the projection lens 10.
- the projection lens 10 projects an optical image of light modulated by the DMD elements 301a to 301c on a screen (not shown).
- FIG. 5 is a configuration diagram showing a schematic configuration of a projection display apparatus 400 according to still another embodiment of the present invention.
- the projection display device 400 includes a light source 20, an illumination optical unit 30, transmissive liquid crystal display elements 401a to 401c as light valves corresponding to each color light, dichroic mirrors 12 and 13 for color separation, A cross dichroic prism 414 for synthesis, condenser lenses 418a to 418c, total reflection mirrors 16a to 16c for deflecting an optical path, and a projection lens 10 according to an embodiment of the present invention are provided.
- the illumination optical unit 30 and the projection lens 10 are schematically shown.
- white light from the light source 20 is decomposed into three colored light beams (G light, B light, R light) by the dichroic mirrors 12 and 13 via the illumination optical unit 30.
- the separated color light beams pass through the condenser lenses 418a to 418c and enter the transmissive liquid crystal display elements 401a to 401c corresponding to the color light beams, respectively, and are light-modulated. Is incident on the lens 10.
- the projection lens 10 projects an optical image by light modulated by the transmissive liquid crystal display elements 401a to 401c on a screen (not shown).
- Example 1 The lens configuration diagram of the projection lens of Example 1 is shown in FIG. Since the main description regarding FIG. 1 has been described above, a part of the overlapping description is omitted here.
- the schematic configuration of the projection lens of Example 1 is as follows.
- the projection lens of Example 1 is a second lens composed of a negative meniscus first lens L1 having a concave surface facing the reduction side in the paraxial region and a positive meniscus lens having a concave surface facing the reduction side in order from the magnification side.
- Six lenses of L2, a third lens L3 made of a biconcave lens, a fourth lens L4 made of a biconvex lens, a fifth lens L5 made of a biconvex lens, and a sixth lens L6 biconvex in the paraxial region Are arranged so that the reduction side is telecentric.
- the third lens L3 and the fourth lens L4 are cemented.
- the surfaces on both sides of the first lens L1 and the surfaces on both sides of the sixth lens are aspheric surfaces.
- a diaphragm 3 is disposed between the second lens L2 and the third lens L3.
- Table 1 and Table 2 show the basic lens data and aspherical coefficients of Example 1 as the detailed configuration of the projection lens of Example 1, respectively.
- the surface of the enlargement side of the most enlargement component is set to 0 in the column of Si of the basic lens data.
- the basic lens data includes the diaphragm 3. In the surface number column of the screen and the diaphragm 3, the words (SCR) and (St) are entered together with the surface number.
- the Ri column of the basic lens data indicates the radius of curvature of the i-th surface.
- the sign of the radius of curvature is positive when the surface shape is convex on the enlargement side and negative when the surface shape is convex on the reduction side.
- R1 to R14 shown in FIG. 1 correspond to Ri of basic lens data.
- the Di field of the basic lens data indicates the surface spacing on the optical axis Z between the i-th surface and the i + 1-th surface, and the Ndj column indicates the most magnified component as the first, and as it goes to the reduction side.
- the numerical value in the column corresponding to D0 is the projection distance.
- Zd C ⁇ h 2 / ⁇ 1+ (1-K ⁇ C 2 ⁇ h 2 ) 1/2 ⁇ + ⁇ Am ⁇ h m
- Zd Depth of aspheric surface (length of a perpendicular line drawn from a point on the aspherical surface at height h to a plane perpendicular to the optical axis where the aspherical vertex contacts)
- h Height (distance from the optical axis to the lens surface)
- C Paraxial curvature K
- Tables 1 and 2 are standardized so that the focal length of the entire system is 1.
- the numerical values in each table are rounded to a predetermined digit.
- FIGS. 6A to 6D show aberration diagrams of the spherical aberration, astigmatism, distortion (distortion aberration), and lateral chromatic aberration (chromatic aberration of magnification) of the projection lens of Example 1, respectively.
- the aberration diagrams in FIGS. 6A to 6D are based on the d-line, but in the spherical aberration diagram, the C-line (wavelength 656.3 nm) and the F-line (wavelength 486.1 nm). Are also shown, and the chromatic aberration diagram for magnification shows aberrations for the F-line and C-line.
- the aberrations in the sagittal direction and the tangential direction are indicated by solid lines and broken lines.
- the aberration diagrams shown in FIGS. 6A to 6D are obtained at the projection distances shown in Table 1.
- FIG. 7 shows the lens configuration of the projection lens of Example 2.
- the schematic configuration of the projection lens of Example 2 is the same as that of Example 1, but instead of the optical member 2 of Example 1, Example 2 uses optical members 2a and 2b.
- Tables 3 and 4 show basic lens data and aspherical coefficients of the projection lens of Example 2, respectively.
- the aberration diagrams of the projection lens of Example 2 are shown in FIGS. 8 (A) to 8 (D).
- FIG. 9 shows the lens configuration of the projection lens of Example 3.
- the schematic configuration of the projection lens of Example 3 is substantially the same as that of Example 2, except that the first lens L1 has a biconcave shape in the paraxial region, and the sixth lens L6 is reduced.
- the sixth lens L6 is different in that it is a plano-convex lens having a flat surface facing the side, and the sixth lens L6 does not have an aspherical surface.
- Tables 5 and 6 show basic lens data and aspherical coefficients of the projection lens of Example 3, respectively.
- the aberration diagrams of the projection lens of Example 3 are shown in FIGS.
- Table 7 shows the corresponding values of the conditional expressions (1) to (7) of Examples 1 to 3. The values shown in Table 7 are for the d line.
- the present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made.
- the values of the radius of curvature, the surface spacing, the refractive index, the Abbe number, and the aspheric coefficient of each lens are not limited to the values shown in the above numerical examples, and can take other values.
- the projection display device of the present invention is not limited to the above-described configuration, for example, the light valve used and the optical member used for light beam separation or light beam synthesis are not limited to the above-described configuration, Various modifications can be made.
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Abstract
Description
-3.0≦1/(P4×f)≦-0.4 … (1)
-2.0≦1/(P5×f)≦-0.2 … (2)
ただし、
P4:第2レンズの縮小側の面のパワー
P5:第3レンズの拡大側の面のパワー
f:全系の焦点距離
-2.5≦1/(P4×f)≦-0.6 … (1’)
-1.5≦1/(P5×f)≦-0.3 … (2’)
0.5≦Bf/f≦2.0 … (3)
0.5≦Bf/f≦1.5 … (3’)
ただし、
Bf:全系のバックフォーカス(空気換算距離)
1.0≦D/f≦3.5 … (4)
1.5≦D/f≦3.0 … (4’)
ただし、
D:第1レンズの拡大側のレンズ面から第6レンズの縮小側のレンズ面までの光軸上の距離
0.2≦R3/R4≦0.9 … (5)
0.3≦R3/R4≦0.9 … (5’)
ただし、
R3:第2レンズの拡大側の面の曲率半径
R4:第2レンズの縮小側の面の曲率半径
1.0≦f2/f≦2.5 … (6)
1.1≦f2/f≦2.0 … (6’)
ただし、
f2:第2レンズの焦点距離
νd2≦30 … (7)
ただし、
νd2:第2レンズのd線に対するアッベ数
-3.0≦1/(P4×f)≦-0.4 … (1)
-2.0≦1/(P5×f)≦-0.2 … (2)
ただし、
P4:第2レンズの縮小側の面のパワー
P5:第3レンズの拡大側の面のパワー
f:全系の焦点距離
-2.5≦1/(P4×f)≦-0.6 … (1’)
-1.5≦1/(P5×f)≦-0.3 … (2’)
0.5≦Bf/f≦2.0 … (3)
1.0≦D/f≦3.5 … (4)
0.2≦R3/R4≦0.9 … (5)
1.0≦f2/f≦2.5 … (6)
νd2≦30 … (7)
ただし、
Bf:全系のバックフォーカス(空気換算距離)
f:全系の焦点距離
D:第1レンズの拡大側のレンズ面から第6レンズの縮小側のレンズ面までの光軸上の距離
R3:第2レンズの拡大側の面の曲率半径
R4:第2レンズの縮小側の面の曲率半径
f2:第2レンズの焦点距離
νd2:第2レンズのd線に対するアッベ数
0.5≦Bf/f≦1.5 … (3’)
1.5≦D/f≦3.0 … (4’)
0.3≦R3/R4≦0.9 … (5’)
1.1≦f2/f≦2.0 … (6’)
<実施例1>
実施例1の投写用レンズのレンズ構成図は図1に示したものである。図1に関する主な説明は上述しているため、ここでは重複説明を一部省略する。
ただし、
Zd:非球面深さ(高さhの非球面上の点から、非球面頂点が接する光軸に垂直な平面に下ろした垂線の長さ)
h:高さ(光軸からのレンズ面までの距離)
C:近軸曲率
K、Am:非球面係数(m=3、4、5、…10)
図7に、実施例2の投写用レンズのレンズ構成を示す。実施例2の投写用レンズの概略構成は、実施例1のものと同様であるが、実施例1の光学部材2に代わり、実施例2では光学部材2a、2bを用いている。実施例2の投写用レンズの基本レンズデータと非球面係数をそれぞれ表3、表4に示す。実施例2の投写用レンズの各収差図を図8(A)~図8(D)に示す。
図9に、実施例3の投写用レンズのレンズ構成を示す。実施例3の投写用レンズの概略構成は、実施例2のものと略同様の構成とされているが、第1レンズL1が近軸領域で両凹形状である点、第6レンズL6が縮小側に平面を向けた平凸レンズである点、第6レンズL6は非球面を有しない点において相違している。実施例3の投写用レンズの基本レンズデータと非球面係数をそれぞれ表5、表6に示す。実施例3の投写用レンズの各収差図を図10(A)~図10(D)に示す。
Claims (15)
- 拡大側から順に、縮小側に凹面を向けた負の屈折力を有する第1レンズと、縮小側に凹面を向けた正の屈折力を有する第2レンズと、拡大側に凹面を向けた負の屈折力を有する第3レンズと、縮小側に凸面を向けた正の屈折力を有する第4レンズと、正の屈折力を有する第5レンズと、正の屈折力を有する第6レンズとから構成される実質的に6枚のレンズからなり、
縮小側がテレセントリックであり、
下記条件式(1)、(2)を満足することを特徴とする投写用レンズ。
-3.0≦1/(P4×f)≦-0.4 … (1)
-2.0≦1/(P5×f)≦-0.2 … (2)
ただし、
P4:前記第2レンズの縮小側の面のパワー
P5:前記第3レンズの拡大側の面のパワー
f:全系の焦点距離 - 下記条件式(1’)を満足することを特徴とする請求項1記載の投写用レンズ。
-2.5≦1/(P4×f)≦-0.6 … (1’) - 下記条件式(2’)を満足することを特徴とする請求項1または2記載の投写用レンズ。
-1.5≦1/(P5×f)≦-0.3 … (2’) - 下記条件式(3)を満足することを特徴とする請求項1から3のいずれか1項記載の投写用レンズ。
0.5≦Bf/f≦2.0 … (3)
ただし、
Bf:全系のバックフォーカス(空気換算距離) - 下記条件式(4)を満足することを特徴とする請求項1から4のいずれか1項記載の投写用レンズ。
1.0≦D/f≦3.5 … (4)
ただし、
D:前記第1レンズの拡大側のレンズ面から前記第6レンズの縮小側のレンズ面までの光軸上の距離 - 下記条件式(3’)を満足することを特徴とする請求項4記載の投写用レンズ。
0.5≦Bf/f≦1.5 … (3’) - 下記条件式(4’)を満足することを特徴とする請求項5記載の投写用レンズ。
1.5≦D/f≦3.0 … (4’) - 下記条件式(5)を満足することを特徴とする請求項1から7のいずれか1項記載の投写用レンズ。
0.2≦R3/R4≦0.9 … (5)
ただし、
R3:前記第2レンズの拡大側の面の曲率半径
R4:前記第2レンズの縮小側の面の曲率半径 - 下記条件式(5’)を満足することを特徴とする請求項8記載の投写用レンズ。
0.3≦R3/R4≦0.9 … (5’) - 下記条件式(6)を満足することを特徴とする請求項1から9のいずれか1項記載の投写用レンズ。
1.0≦f2/f≦2.5 … (6)
ただし、
f2:前記第2レンズの焦点距離 - 下記条件式(6’)を満足することを特徴とする請求項10記載の投写用レンズ。
1.1≦f2/f≦2.0 … (6’) - 前記第3レンズと前記第4レンズとが接合されていることを特徴とする請求項1から11のいずれか1項記載の投写用レンズ。
- 下記条件式(7)を満足することを特徴とする請求項1から12のいずれか1項記載の投写用レンズ。
νd2≦30 … (7)
ただし、
νd2:前記第2レンズのd線に対するアッベ数 - 前記第1レンズおよび前記第6レンズが有するレンズ面のうち少なくとも1面が非球面であることを特徴とする請求項1から13のいずれか1項記載の投写用レンズ。
- 光源と、該光源からの光が入射するライトバルブと、該ライトバルブにより光変調された光による光学像をスクリーン上に投写する投写用レンズとしての請求項1から14のいずれか1項記載の投写用レンズとを備えたことを特徴とする投写型表示装置。
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JP2014511106A JP5670602B2 (ja) | 2012-04-19 | 2013-04-16 | 投写用レンズおよび投写型表示装置 |
CN201390000408.8U CN204178036U (zh) | 2012-04-19 | 2013-04-16 | 投影用透镜以及投影型显示装置 |
US14/515,727 US9285564B2 (en) | 2012-04-19 | 2014-10-16 | Lens for projection and projection-type display apparatus |
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US14/515,727 Continuation US9285564B2 (en) | 2012-04-19 | 2014-10-16 | Lens for projection and projection-type display apparatus |
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JP2017026891A (ja) * | 2015-07-24 | 2017-02-02 | 株式会社リコー | 撮像光学系、カメラ装置、及び携帯情報端末装置 |
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TWI534462B (zh) * | 2014-06-17 | 2016-05-21 | 信泰光學(深圳)有限公司 | 投影鏡頭 |
CN109298506B (zh) * | 2017-07-24 | 2021-07-06 | 宁波舜宇车载光学技术有限公司 | 光学镜头 |
CN109932820A (zh) * | 2017-12-18 | 2019-06-25 | 中强光电股份有限公司 | 显示器 |
CN108363161A (zh) * | 2018-01-05 | 2018-08-03 | 玉晶光电(厦门)有限公司 | 光学成像镜头 |
RU2686581C1 (ru) * | 2018-03-12 | 2019-04-29 | Акционерное общество "Опытно-конструкторское бюро "Электроавтоматика" имени П.А. Ефимова | Проекционная оптическая система с телецентрическим ходом лучей в пространствах предметов и изображений |
JP7076160B2 (ja) * | 2019-07-29 | 2022-05-27 | 深▲ゼン▼納徳光学有限公司 | 接眼レンズ光学システム及び頭部装着型ディスプレイ |
CN110568586B (zh) * | 2019-08-30 | 2024-06-04 | 歌尔光学科技有限公司 | 投影镜头及投影设备 |
TWI709786B (zh) * | 2019-10-29 | 2020-11-11 | 上暘光學股份有限公司 | 投影鏡頭 |
CN113219630B (zh) * | 2021-04-30 | 2022-09-27 | 江西凤凰光学科技有限公司 | 一种高低温日夜共焦光学镜头 |
CN113777752B (zh) * | 2021-09-10 | 2023-01-10 | 天津欧菲光电有限公司 | 光学系统、取像模组以及电子设备 |
CN114296219B (zh) * | 2021-12-29 | 2023-09-12 | 歌尔光学科技有限公司 | 一种投影镜头以及投影仪 |
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US9285564B2 (en) | 2016-03-15 |
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