CN115494686A - Fixed focus projection lens - Google Patents
Fixed focus projection lens Download PDFInfo
- Publication number
- CN115494686A CN115494686A CN202110881476.0A CN202110881476A CN115494686A CN 115494686 A CN115494686 A CN 115494686A CN 202110881476 A CN202110881476 A CN 202110881476A CN 115494686 A CN115494686 A CN 115494686A
- Authority
- CN
- China
- Prior art keywords
- lens
- focus projection
- fixed
- lens group
- projection lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 53
- 239000002759 woven fabric Substances 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 102100034032 Cytohesin-3 Human genes 0.000 description 17
- 101710160297 Cytohesin-3 Proteins 0.000 description 17
- 230000003292 diminished effect Effects 0.000 description 13
- 239000011521 glass Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
-
- 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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
A fixed focus projection lens comprises a first lens group and a second lens group, wherein the first lens group and the second lens group are separated by a minimum position (diaphragm) of the inner diameter of a lens barrel. The first lens group comprises 6 to 8 lenses with diopter and comprises two aspheric lens surfaces. The diopter of the second lens group is positive, the second lens group comprises 5 to 8 lenses with diopter and comprises two gluing surfaces, and the lenses with diopter are spherical lenses.
Description
Technical Field
The present disclosure relates to optical lenses, and particularly to a fixed focus projection lens.
Background
The projection lens can project the image beam from the light valve to a projection target. The wide-angle projection lens can effectively shorten the distance between the projection target and the projection device. However, the aberrations, such as Distortion, field Curvature, astigmatism, etc., derived from the wide-angle projection lens are all the problems that must be faced by the design of the wide-angle projection lens.
In general, in order to meet the requirements of small chromatic aberration and low distortion, a wide-angle projection lens has a long total length of a system and a large number of lenses, and the lens is difficult to meet the requirements of light weight and miniaturization in addition to increasing the cost and the manufacturing difficulty.
Disclosure of Invention
The invention provides a fixed focus projection lens, which can maintain good image quality under the condition of system total length limitation.
The invention relates to a fixed-focus projection lens, which comprises a first lens group and a second lens group, wherein the first lens group and the second lens group are separated by a minimum position (diaphragm aperture) of the inner diameter of a lens cone, and the first lens group and the second lens group are sequentially arranged on an optical axis from an enlargement side to a reduction side. The first lens group comprises 6-8 lenses with diopter and comprises two aspheric lens surfaces. The diopter of the second lens group is positive, the second lens group comprises 5 to 8 lenses with diopter and comprises two gluing surfaces, and the lenses with diopter are spherical lenses. And the fixed-focus projection lens meets the following conditions: 0.6 are woven into (D1/OAL) less than 0.8. Wherein D1 is the diameter of the first lens counted from the magnification side of the fixed-focus projection lens, and OAL is the shortest distance between the outermost lens surfaces at the two ends of the fixed-focus projection lens.
The invention discloses a fixed-focus projection lens, which comprises a first lens group, a second lens group and a third lens group, wherein the first lens group, the second lens group and the third lens group are sequentially arranged on an optical axis from an enlargement side to a reduction side, the first lens group and the third lens group are fixed lens groups, and the second lens group is a movable lens group. The minimum position of the inner diameter of the lens barrel of the fixed-focus projection lens is arranged between the second lens group and the outermost lens of the third lens group. The first lens group includes two aspherical lens surfaces. The third lens group comprises 6 to 9 lenses with diopter, the lenses with diopter are all spherical lenses, and the third lens group comprises two adjacent lens surfaces, wherein the two adjacent lens surfaces at each position respectively meet the following conditions: the ratio of the difference in radius of curvature between adjacent lens surfaces to the larger radius of curvature in the adjacent lens surfaces is <0.01. And the fixed-focus projection lens comprises 11 to 16 lenses with diopter in total, and the fixed-focus projection lens satisfies the following conditions: 2-sD1/DL <4. Where D1 is the diameter of the first lens from the magnification side of the fixed focus projection lens, and DL is the diameter of the last lens from the magnification side of the fixed focus projection lens.
The invention relates to a fixed-focus projection lens, which comprises 11 to 15 lenses with diopter and a diaphragm (aperture). Wherein the aforementioned lenses are arranged in order on the optical axis from the magnification side to the reduction side as a fixed first lens group, a movable second lens group, and a fixed third lens group. The stop is disposed between the last lens counted from the magnification side in the second lens group and the last lens counted from the magnification side in the third lens group. The first lens group includes two aspherical lens surfaces. The third lens group comprises 6 to 9 lenses with diopter, and the third lens group comprises two pairs of adjacent lens surfaces, wherein the two pairs of adjacent lens surfaces are in a lens combination with substantially corresponding shapes. And the fixed-focus projection lens meets the following two conditions: (1) 2-woven fabric D1/DL <4; and (2) 0.06-once TH23/OAL <0.32. Wherein D1 is the diameter of the first lens counted from the magnifying side of the fixed focus projection lens, DL is the diameter of the last lens counted from the magnifying side of the fixed focus projection lens, TH23 is the shortest distance between the second lens group and the third lens group, and OAL is the distance on the optical axis between the outermost lens surfaces at the two ends of the fixed focus projection lens.
In view of the above, the fixed focus projection lens according to the embodiment of the invention can maintain good image quality under the condition of the limitation of the total system length according to the overall arrangement of each optical element in the fixed focus projection lens.
Drawings
Fig. 1 to 5 are schematic diagrams of fixed-focus projection lenses according to first to fifth embodiments of the present invention.
Fig. 6A, 6B to 16A, and 16B are schematic diagrams and detailed optical data of a fixed-focus projection lens according to a sixth embodiment to a sixteenth embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a fixed focus projection lens PL according to a first embodiment of the present invention. Referring to fig. 1, a fixed focus projection lens PL of the first embodiment of the present invention includes a first lens group G1 and a second lens group G2. The first lens group G1 and the second lens group G2 are sequentially arranged on the optical axis I from the magnification side A1 to the reduction side A2. The first lens group G1 and the second lens group G2 are separated by a minimum position S12 (i.e. the position of the stop 0) of the inner diameter of the lens barrel. The first lens group G1 includes 6 to 8 lenses having diopter and includes at least two aspherical lens surfaces. In the present embodiment, the first lens group G1 includes 6 lenses having diopter, and includes, in order from the magnification side A1 to the reduction side A2, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a sixth lens 6, which include four aspheric lens surfaces S1, S2, S3 and S4. In another embodiment, the first lens 1 of the aspheric lens can be replaced by 1 aspheric lens and 1 spherical lens, and in this case, the first lens group G1 includes 7 lenses with diopter. In another embodiment, the first lens 1 and the second lens 2 of the aspheric lens may be replaced by 1 aspheric lens and 1 spherical lens, respectively, in which case the first lens group G1 includes 8 lenses with diopter.
In detail, the first lens element 1 is a plastic lens and is an aspheric lens. The diopter of the first lens 1 is negative. The second lens element 2 is a plastic lens element and is an aspheric lens element. The diopter of the second lens 2 is positive.
The third lens 3 is a glass lens and a spherical lens. The third lens 3 is negative in diopter and is a convex-concave lens in which the magnification-side surface S5 toward the magnification side A1 in the third lens 3 is a convex surface, the reduction-side surface S6 toward the reduction side A2 is a concave surface, and the surfaces S5, S6 are spherical lens surfaces.
The fourth lens 4 is a glass lens and is a spherical lens. The refractive power of the fourth lens 4 is negative and is a biconcave lens in which the enlargement-side surface S7 toward the enlargement side A1 in the fourth lens 4 is a concave surface, the reduction-side surface S8 toward the reduction side A2 is a concave surface, and the surfaces S7, S8 are spherical lens surfaces.
The fifth lens 5 is a glass lens and is a spherical lens. The fifth lens 5 is negative in diopter and is a biconcave lens. The sixth lens 6 is a glass lens and is a spherical lens. The sixth lens 6 is positive in diopter and is a biconvex lens. The fifth lens 5 and the sixth lens 6 are bonded on the cemented surface S10 as a cemented doublet. The magnification-side surface S9 of the fifth lens 5 facing the magnification side A1 is a concave surface, the reduction-side surface S11 of the sixth lens 6 facing the reduction side A2 is a convex surface, and the surfaces S9, S10, S11 are spherical lens surfaces.
The diopter of the second lens group G2 is positive. The second lens group G2 includes 5 to 8 diopter lenses, and the diopter lenses are all spherical lenses. In the present embodiment, the second lens group G2 includes 7 lenses with diopter, and includes a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12 and a thirteenth lens 13 in sequence from the magnification side A1 to the reduction side A2, wherein the seventh lens 7 to the thirteenth lens 13 are all spherical lenses. In another embodiment, the seventh lens 7 of the spherical lens can be replaced by 2 spherical lenses, in which case the second lens group G2 includes 8 lenses with diopter. The second lens group G2 comprises at least two gluing surfaces. In the present embodiment, the second lens group G2 includes three cemented surfaces S16, S17, S20. The second lens group G2 includes at least 4 positive power lenses (including a positive power lens of a single lens and a positive power lens of a cemented lens). In the present embodiment, the second lens group G2 includes 4 positive diopter lenses.
In detail, the seventh lens 7 is a glass lens and a spherical lens. The seventh lens 7 is positive in refractive power and is a meniscus lens, in which an enlargement-side surface S13 facing the enlargement side A1 in the seventh lens 7 is a convex surface, a reduction-side surface S14 facing the reduction side A2 is a concave surface, and the surfaces S13, S14 are spherical lens surfaces.
The eighth lens 8 is a glass lens and a spherical lens. The eighth lens 8 has a negative diopter and is a convex-concave lens. The ninth lens 9 is a glass lens and a spherical lens. The refractive power of the ninth lens 9 is positive and is a biconvex lens. The tenth lens 10 is a glass mirror and is a spherical lens. The tenth lens 10 is negative in diopter and is a convex-concave lens. The eighth lens 8 and the ninth lens 9 are joined on the cemented surface S16 and the ninth lens 9 and the tenth lens 10 are joined on the cemented surface S17 to form a cemented triplet. The magnification-side surface S15 of the eighth lens 8 facing the magnification side A1 is a convex surface, the reduction-side surface S18 of the tenth lens 10 facing the reduction side A2 is a convex surface, and the surfaces S15, S16, S17, S18 are spherical lens surfaces.
The eleventh lens 11 is a glass lens and is a spherical lens. The optical power of the eleventh lens 11 is positive and is a biconvex lens. The twelfth lens 12 is a glass mirror and is a spherical lens. The twelfth lens 12 is negative in diopter and is a convex-concave lens. The eleventh lens 11 and the twelfth lens 12 are joined on the cemented surface S20 into a cemented doublet. The enlargement-side surface S19 facing the enlargement side A1 in the eleventh lens 11 is a convex surface, the reduction-side surface S21 facing the reduction side A2 in the twelfth lens 12 is a convex surface, and the surfaces S19, S20, S21 are spherical lens surfaces.
The thirteenth lens 13 is a glass lens and is a spherical lens. The power of the thirteenth lens element 13 is positive and is a biconvex lens element, in which the magnification-side surface S22 facing the magnification side A1 of the thirteenth lens element 13 is a convex surface, the reduction-side surface S23 facing the reduction side A2 is a convex surface, and the surfaces S22, S23 are spherical lens surfaces.
In the present embodiment, the enlargement side surface S1 toward the enlargement side A1, the reduction side surface S2 toward the reduction side A2 of the first lens 1, the enlargement side surface S3 toward the enlargement side A1, and the reduction side surface S4 toward the reduction side A2 of the second lens 2 are all aspherical (aspheric surface), and these aspherical surfaces are defined by the following formula:
wherein:
r: the radius of curvature of the lens surface near the optical axis I;
y: the vertical distance between a point on the aspheric surface curved surface and the optical axis I;
z: depth of the aspheric surface (the point on the aspheric surface that is Y from the optical axis I, the perpendicular distance between the point and the tangent plane tangent to the vertex on the optical axis I of the aspheric surface);
k: cone constant (conc constant);
a2i: aspheric coefficients of order 2 i.
The conic coefficients and the aspherical coefficients of the respective terms in the formula (1) from the magnification-side surface S1 of the first lens 1 to the reduction-side surface S4 of the second lens 2 are shown in table 1. In table 1, the column number S1 indicates the conic coefficient and the aspheric coefficient of the magnification-side surface S1 of the first lens 1, and so on. In each embodiment, the magnification-side surface S1 of the first lens 1 to the reduction-side surface S4 of the second lens 2 are all 0 in the 2 nd order aspheric coefficient (a 2) in the formula (1).
The fixed focus projection lens PL further includes a diaphragm 0. The position of the smallest inner diameter of the lens barrel of the fixed-focus projection lens PL is provided between the last lens counted from the magnification side A1 of the second lens group Grp2 to the last lens counted from the magnification side A1 of the third lens group Grp3. In the present embodiment, the tube inner diameter minimum position S12 (i.e., the stop 0) of the fixed focus projection lens PL is provided between the sixth lens 6 and the seventh lens 7.
In the present embodiment, the reduction side A2 of the fixed-focus projection lens PL is provided with a first plate C1, a second plate C2, a third plate C3, and a light valve E. The fixed focus projection lens PL, the first plate C1, the second plate C2, the third plate C3, and the light valve E constitute a projection apparatus. The light valve E is, for example, a digital micro-mirror device (DMD), a Liquid Crystal On Silicon (LCOS) panel, a transmissive liquid crystal panel or other suitable light valve or light valve module, which is not limited in the present invention. The light emitting surface S30 of the light valve E faces the fixed focus projection lens PL, so that the fixed focus projection lens PL can project the image beam projected by the light valve E to a screen, a wall, a ground or any other suitable place.
The first, second and third plates C1, C2, C3 may be flat plates of any suitable light-transmissive material. The first plate C1, the second plate C2, and the third plate C3 have enlargement side surfaces S24, S26, S28 that face the enlargement side A1 and pass the image light beams, and reduction side surfaces S25, S27, S29 that face the reduction side A2 and pass the image light beams, respectively. The image beam from the light-emitting surface S30 of the light valve E can pass through the third plate C3, the second plate C2, and the first plate C1 in sequence and be projected to the fixed-focus projection lens PL. In some examples, the first, second and third panels C1, C2 and C3 can adjust the length of the projection device and also provide protection for the light valve E.
The fixed-focus projection lens PL includes 11 to 15 pieces of lenses having diopters. In the first embodiment, the fixed-focus projection lens PL includes 13 lenses having diopters. The Total Length (TTL) of the PL system of the fixed focus projection lens is less than 130 mm. In the first embodiment, the total system Length (TTL) is 118.900 mm, the F-number (FNO) is 1.800, the Effective Focal Length (EFL) is 5.220 mm, and the half field of view (HFOV) is 57.700. The total system length (TTL) is a total length on the optical axis from the magnifying side surface S1 of the first lens 1 to the light emitting surface S30 of the light valve E.
The fixed focus projection lens PL includes at least two aspheric lens surfaces. In this embodiment, the fixed focus projection lens PL includes two aspheric plastic lenses, i.e. a first lens 1 and a second lens 2, and the remaining third lens 3 to the thirteenth lens 13 are glass lenses, i.e. the fixed focus projection lens PL is a glass-plastic hybrid lens. The first lens of the fixed focus projection lens PL counted from the magnification side A1 is an aspherical lens. In the present embodiment, the first lens 1 is an aspherical lens. The first lens counted from the magnification side A1 of the fixed focus projection lens PL is a negative diopter lens. In the present embodiment, the first lens 1 is a negative refractive power lens.
The fixed-focus projection lens PL of the present embodiment includes a cemented doublet and a cemented triplet, in which the abbe number of the positive diopter lens in the cemented doublet is greater than 70, and the abbe number of the negative diopter lens in the cemented triplet is less than 40 and the refractive index is greater than or equal to 1.8. In the present embodiment, the fixed focus projection lens PL includes a triple cemented lens in which an eighth lens 8, a ninth lens 9, and a tenth lens 10 are cemented, and a double cemented lens in which an eleventh lens 11, and a twelfth lens 12 are cemented, wherein the abbe numbers of the ninth lens 9 and the eleventh lens 11 having positive refractive power are 81.6. In the present embodiment, the fixed focus projection lens PL includes a cemented triplet in which an eighth lens 8, a ninth lens 9, and a tenth lens 10 are cemented, in which the abbe number of the ninth lens having positive refractive power is 81.6, and the abbe number of the eighth lens 8 having negative refractive power is 37.9 and the refractive index is 1.885, and the abbe number of the tenth lens 10 having negative refractive power is 35.9 and the refractive index is 1.887.
Other detailed optical data of the fixed-focus projection lens PL of the first embodiment are shown in table 1 below. Wherein the column "pitch/thickness" lists the distance between the surfaces, which represents the thickness of each lens or plate on the optical axis I, or the distance between each lens or plate and the surface of the next optical element on the optical axis I. For example, in the column "S1", the "pitch/thickness" represents the thickness of the first lens 1 on the optical axis I, while in the column "S2", the "pitch/thickness" represents the distance between the first lens 1 and the second lens 2 on the optical axis I, and so on. In addition, in the "remarks" column, in addition to the corresponding optical elements, the materials and other characteristics of the corresponding lenses are also marked. The lens marked with the aspheric surface is an aspheric lens, and the lens not marked with the aspheric surface is a spherical lens.
TABLE 1
In another aspect, referring to fig. 1 again, the fixed-focus projection lens PL includes a first lens group Grp1, a second lens group Grp2, and a third lens group Grp3. Wherein the first lens group Grp1, the second lens group Grp2, and the third lens group Grp3 are arranged in order on the optical axis I from the magnification side A1 to the reduction side A2. The first lens group Grp1 and the third lens group Grp3 are fixed lens groups, and the second lens group Grp2 is a movable lens group.
In detail, the first lens group Grp1 includes the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 described above. The first lens group Grp1 includes four aspherical lens surfaces S1, S2, S3, S4. The first lens group Grp1 does not include a cemented lens. The first lens group Grp1 includes at least two negative refractive power lenses. In the present embodiment, the first lens group Grp1 includes three negative refractive power lenses therein.
The second lens group Grp2 includes the above-described fifth lens 5 and sixth lens 6. In the present embodiment, the surface S11 closest to the reduction side A2 in the second lens group Grp2 is a convex surface, and its surface power is positive.
The third lens group Grp3 includes 6 to 9 lenses having diopter. In this embodiment, the third lens group Grp3 includes the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth lens 12 and the thirteenth lens 13, and includes 7 lenses with diopter, and the lenses are all spherical lenses. In the present embodiment, the third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the diminished side surface S16 of the eighth lens 8 and the magnified side surface S16 of the ninth lens 9 are a pair of adjacent lens surfaces, the diminished side surface S17 of the ninth lens 9 and the magnified side surface S17 of the tenth lens 10 are a pair of adjacent lens surfaces, the diminished side surface S20 of the eleventh lens 11 and the magnified side surface S20 of the twelfth lens 12 are a pair of adjacent lens surfaces, and the above-mentioned pairs of adjacent lens surfaces each satisfy the following condition: the ratio of the difference in radius of curvature between a pair of adjacent lens surfaces to the larger radius of curvature of the adjacent lens surfaces is <0.01.
In the present embodiment, the fixed focus projection lens PL can achieve focusing by: the first lens group Grp1 moves on the optical axis I relative to the light valve E, and the second lens group Grp2 and the third lens group Grp3 are fixed relative to the light valve E; the second lens group Grp2 moves on the optical axis I relative to the light valve E, and the first lens group Grp1 and the third lens group Grp3 are fixed relative to the light valve E; or the first lens group Grp1 and the second lens group Grp2 move on the optical axis I relative to the light valve E at the same time, and the third lens group Grp3 is fixed relative to the light valve E. That is, in the present embodiment, focusing can be achieved by adjusting the first lens group Grp1 or the second lens group Grp2 alone, or by adjusting the first lens group Grp1 and the second lens group Grp2 simultaneously.
In the present embodiment, the fixed-focus projection lens PL satisfies the following conditions:
0.6<D1/OAL<0.8；
2<D1/DL<4；
0.06<TH23/OAL<0.32；
HFOV/EFL is less than or equal to 9 and less than or equal to 11.5; and
19≦TTL/EFL≦25。
in the above conditional expressions:
TTL is the total system length of the fixed-focus projection lens PL;
EFL is the effective focal length of the fixed-focus projection lens PL;
the HFOV is a half field angle of the fixed focus projection lens PL;
OAL is the distance between the outermost lens surfaces at the two ends of the fixed-focus projection lens PL on the optical axis;
TH23 is a distance on the optical axis between the second lens group Grp2 and the third lens group Grp 3;
d1 is the diameter of the first lens counted from the magnification side A1 of the fixed focus projection lens PL;
DL is the diameter of the last lens counted from the magnification side A1 of the fixed focus projection lens PL.
In particular, "D1" referred to herein is the diameter of the first lens counted from the magnification side A1 of the fixed-focus projection lens PL. Wherein the diameter refers to the distance between turning points on both sides of the optical center. In this embodiment, the diameter of the magnification-side surface S1 of the first lens element 1 is the distance between two points (the distance between the point P1 and the point Q1 in fig. 1) where the curve of the magnification-side surface S1 turns so as to extend from the optical center to the lens edges on both sides. When the diameter of the magnification-side surface S1 of the first lens 1 is different from the diameter of the reduction-side surface S2 of the first lens 1, the larger thereof is the diameter of the first lens 1. "DL" described herein is the diameter of the last lens counted from the magnification side A1 of the fixed-focus projection lens PL. Wherein the diameter refers to the distance between turning points on both sides of the optical center. In the present embodiment, the diameter of the narrowing-side surface S23 of the thirteenth lens element 13 is the distance between two locations where the curved surface of the narrowing-side surface S23 turns (i.e. the distance between the point P2 and the point Q2 in fig. 1) from the optical center to the lens edges. When the diameter of the magnification-side surface S22 of the thirteenth lens 13 is different from the diameter of the reduction-side surface S23 of the thirteenth lens 13, the larger thereof is the diameter of the thirteenth lens 13. Therefore, the diameter is different from the optical effective diameter output by general optical simulation software.
The optical values of the fixed focus projection lens PL of the present embodiment are detailed in tables 6 and 7 attached below. Wherein, the "G2-EFL" field of table 6 lists the effective focal length of the second lens group G2 of each embodiment.
Fig. 2 is a schematic diagram of a fixed focus projection lens PL according to a second embodiment of the present invention. Please refer to fig. 2. The fixed focus projection lens PL of the second embodiment of the present invention is substantially similar to the fixed focus projection lens PL of the first embodiment, and the difference therebetween lies in: the composition of the first lens group G1 and the second lens group G2, the optical data of each element, and the distance between each element are not all the same. The following is a brief description of the differences.
In the present embodiment, the second lens group G2 includes 8 lenses having diopter, and includes a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 in sequence from the magnification side A1 to the reduction side A2, wherein the seventh lens 7, the eleventh lens 11, and the fourteenth lens 14 include a triple cemented lens in which the eighth lens 8, the ninth lens 9, and the tenth lens 10 are cemented, a double cemented lens in which the twelfth lens 12, and the thirteenth lens 13 are cemented, and the seventh lens 7, the eleventh lens 11, and the fourteenth lens 14 are single lenses.
The fixed-focus projection lens PL of the second embodiment comprises 14 lens elements with diopter, and the first lens element 1 to the fourteenth lens element 14 are arranged in order from the magnification side A1 to the reduction side A2, wherein the refractive indexes of the first lens element 1 to the fourteenth lens element 14 are in order: negative, positive, negative, positive, negative, positive. In this embodiment, the total system Length (TTL) is 126.000 mm, the F-number (FNO) is 1.800, the Effective Focal Length (EFL) is 5.210 mm, and the half field of view (HFOV) is 57.710. The surface type characteristics of each lens surface of the first lens 1 to the fourteenth lens 14 are shown in table 2 below and fig. 2.
Other detailed optical data of the fixed-focus projection lens PL of the second embodiment are shown in table 2 below.
TABLE 2
In the present embodiment, the first lens group Grp1 includes a first lens 1, a second lens 2, and a third lens 3. The second lens group Grp2 includes a fourth lens 4, a fifth lens 5, and a sixth lens 6. And the third lens group Grp3 includes a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14. The third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the diminished side surface S16 of the eighth lens 8 and the magnified side surface S16 of the ninth lens 9 are a pair of adjacent lens surfaces, the diminished side surface S17 of the ninth lens 9 and the magnified side surface S17 of the tenth lens 10 are a pair of adjacent lens surfaces, the diminished side surface S22 of the twelfth lens 12 and the magnified side surface S22 of the thirteenth lens 13 are a pair of adjacent lens surfaces, each of the above-mentioned pairs of adjacent lens surfaces satisfying the following conditions: the ratio of the difference in radius of curvature between a pair of adjacent lens surfaces to the larger radius of curvature of the adjacent lens surfaces is <0.01.
The optical values of the fixed focus projection lens PL of the present embodiment are detailed in tables 6 and 7 attached below.
Fig. 3 is a schematic diagram of a fixed-focus projection lens according to a third embodiment of the present invention. Please refer to fig. 3. A fixed focus projection lens PL of the third embodiment of the present invention is substantially similar to the fixed focus projection lens PL of the first embodiment, and the difference therebetween is that: the composition of the first lens group G1 and the second lens group G2, the optical data of each element, and the distance between each element are not all the same. The following is a brief description of the differences.
In the present embodiment, in the second lens group G2, the eleventh lens 11, the twelfth lens 12, and the thirteenth lens 13 are single lenses.
The fixed-focus projection lens PL of the third embodiment comprises 13 lens elements with refractive power, and the first lens element 1 to the thirteenth lens element 13 are arranged in order from the magnification side A1 to the reduction side A2, wherein the refractive indexes of the first lens element 1 to the thirteenth lens element 13 are in order: negative, positive negative, positive. In this embodiment, the total system Length (TTL) is 120.000 mm, the F-number (FNO) is 1.800, the Effective Focal Length (EFL) is 5.269 mm, and the half field angle (HFOV) is 57.520. The surface type characteristics of each lens surface of the first lens 1 to the thirteenth lens 13 are shown in table 3 below and fig. 3.
Other detailed optical data of the fixed-focus projection lens PL of the third embodiment are shown in table 3 below.
TABLE 3
In the present embodiment, the first lens group Grp1 includes a first lens 1, a second lens 2, and a third lens 3. The second lens group Grp2 includes a fourth lens 4, a fifth lens 5, and a sixth lens 6. The third lens group Grp3 includes a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, and a thirteenth lens 13. The third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the diminished side surface S15 of the eighth lens 8 and the magnified side surface S15 of the ninth lens 9 are a pair of adjacent lens surfaces, and the diminished side surface S16 of the ninth lens 9 and the magnified side surface S16 of the tenth lens 10 are a pair of adjacent lens surfaces, each of the above-mentioned pairs of adjacent lens surfaces satisfying the following condition: the ratio of the difference in radius of curvature between a pair of adjacent lens surfaces to the larger radius of curvature of the adjacent lens surfaces is <0.01.
The optical values of the fixed focus projection lens PL of the present embodiment are detailed in tables 6 and 7 attached below.
Fig. 4 is a schematic diagram of a fixed-focus projection lens according to a fourth embodiment of the present invention. Please refer to fig. 4. A fixed-focus projection lens PL according to a fourth embodiment of the present invention is substantially similar to the fixed-focus projection lens PL according to the first embodiment, and the difference therebetween lies in: the composition of the first lens group G1 and the second lens group G2, the optical data of each element, and the distance between each element are not all the same. The following is a brief description of the differences.
In the present embodiment, the first lens group G1 includes 7 lenses having diopter, and includes, in order from the magnification side A1 to the reduction side A2, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7. In another embodiment, the first lens 1 of the aspheric lens may be replaced by 1 aspheric lens and 1 spherical lens, and in this case, the first lens group G1 includes 8 lenses with diopter. In another embodiment, two adjacent spherical lenses may be replaced by 1 aspheric lens, and in this case, the first lens group G1 includes 6 lenses with diopter. The second lens group G2 includes 5 lenses having diopter, and includes, in order from the magnification side A1 to the reduction side A2, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, and a twelfth lens 12, in which the eighth lens 8, the ninth lens 9, and the tenth lens 10 are joined to form a cemented triplet, and the eleventh lens 11 and the twelfth lens 12 are single-lens lenses. The minimum position S12 (i.e., the stop 0) of the inner diameter of the lens barrel of the fixed-focus projection lens PL is disposed between the seventh lens 7 and the eighth lens 8. In another embodiment, the twelfth lens element 12 of the spherical lens element may be replaced by 2 spherical lens elements, in which case the second lens group G2 includes 6 lens elements with diopter. In another embodiment, the twelfth lens element 12 of the spherical lens element may be replaced by 3 spherical lens elements, and in this case, the second lens group G2 includes 7 lens elements with diopter. In another embodiment, the eleventh lens 11 of the spherical lens may be replaced by 2 spherical lenses, and the twelfth lens 12 of the spherical lens may be replaced by 3 spherical lenses, in which case, the second lens group G2 includes 8 lenses with diopter.
The fixed-focus projection lens PL of the fourth embodiment comprises 12 lens elements with diopter, and the first lens element 1 to the twelfth lens element 12 are arranged in sequence from the magnification side A1 to the reduction side A2, wherein the refractive indexes of the first lens element 1 to the twelfth lens element 12 are in sequence: negative, positive, negative, positive, and positive. In this embodiment, the total system Length (TTL) is 124.500 mm, the F-number (FNO) is 1.800, the Effective Focal Length (EFL) is 5.230 mm, and the half field of view (HFOV) is 57.660. The surface type characteristics of each lens surface of the first lens 1 to the twelfth lens 12 are shown in table 4 below and fig. 4.
Other detailed optical data of the fixed focus projection lens PL of the fourth embodiment are shown in table 4 below.
TABLE 4
In the present embodiment, the first lens group Grp1 includes a first lens 1, a second lens 2, and a third lens 3. The second lens group Grp2 includes a fourth lens 4, a fifth lens 5, and a sixth lens 6. The third lens group Grp3 includes a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, and a twelfth lens 12. The third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the diminished side surface S16 of the eighth lens 8 and the magnified side surface S16 of the ninth lens 9 are a pair of adjacent lens surfaces, and the diminished side surface S17 of the ninth lens 9 and the magnified side surface S17 of the tenth lens 10 are a pair of adjacent lens surfaces, each of the above-mentioned pairs of adjacent lens surfaces satisfying the following condition: the ratio of the difference in radius of curvature between a pair of adjacent lens surfaces to the larger radius of curvature of the adjacent lens surfaces is <0.01.
The optical values of the fixed focus projection lens PL of the present embodiment are detailed in tables 6 and 7 attached below.
Fig. 5 is a schematic diagram of a fixed-focus projection lens according to a fifth embodiment of the present invention. Please refer to fig. 5. A fixed focus projection lens PL of the fifth embodiment of the present invention is substantially similar to the fixed focus projection lens PL of the first embodiment, and the difference therebetween is that: the composition of the first lens group G1 and the second lens group G2, the optical data of each element, and the distance between each element are not all the same. The following is a brief description of the differences.
In the present embodiment, the first lens group G1 includes 7 lenses having diopter, and includes, in order from the magnification side A1 to the reduction side A2, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7. The second lens group G2 includes 7 lenses having diopter, and includes, in order from the magnification side A1 to the reduction side A2, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14, wherein the ninth lens 9, the tenth lens 10, and the eleventh lens 11 are joined to form a triple cemented lens, and the twelfth lens 12 and the thirteenth lens 13 are joined to form a double cemented lens. The eighth lens 8 and the fourteenth lens 14 are single-piece lenses. The minimum inner diameter position S12 (i.e., the stop 0) of the lens barrel of the fixed focus projection lens PL is provided between the seventh lens 7 and the eighth lens 8.
The fixed-focus projection lens PL of the fifth embodiment comprises 14 lens elements with diopter, which are the first lens element 1 to the fourteenth lens element 14 in sequence from the magnification side A1 to the reduction side A2, wherein the refractive indexes of the first lens element 1 to the fourteenth lens element 14 are in sequence as follows: negative, positive, negative, positive positive, negative, positive. In this embodiment, the total system Length (TTL) is 124.700 mm, the F-number (FNO) is 1.800, the Effective Focal Length (EFL) is 5.260 mm, and the half field of view (HFOV) is 57.560. The surface type characteristics of each lens surface of the first lens 1 to the fourteenth lens 14 are shown in table 5 below and fig. 5.
Other detailed optical data of the fixed focus projection lens PL of the fifth embodiment are shown in table 5 below.
TABLE 5
In the present embodiment, the first lens group Grp1 includes a first lens 1, a second lens 2, and a third lens 3. The second lens group Grp2 includes a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7. The second lens group Grp3 includes an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14. The third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the diminished side surface S18 of the ninth lens 9 and the magnified side surface S18 of the tenth lens 10 are a pair of adjacent lens surfaces, the diminished side surface S19 of the tenth lens 10 and the magnified side surface S19 of the eleventh lens 11 are a pair of adjacent lens surfaces, the diminished side surface S22 of the twelfth lens 12 and the magnified side surface S22 of the thirteenth lens 13 are a pair of adjacent lens surfaces, each of the above-mentioned pairs of adjacent lens surfaces satisfying the following conditions: the ratio of the difference in radius of curvature between a pair of adjacent lens surfaces to the larger radius of curvature of the adjacent lens surfaces is <0.01.
The optical values of the fixed focus projection lens PL of the present embodiment are detailed in tables 6 and 7, which are attached below.
Referring to fig. 6A, a schematic diagram of a fixed-focus projection lens according to a sixth embodiment of the invention is shown, and detailed optical data thereof is shown in fig. 6B, and tables 6 and 7. Fig. 7A to 16B, and tables 6 and 7 show schematic diagrams of fixed-focus projection lenses according to seventh to sixteenth embodiments of the present invention and detailed optical data thereof.
Tables 6 and 7 show the optical values of the fixed-focus projection lenses PL according to the first to sixteenth embodiments.
TABLE 6
TABLE 7
| D1/OAL | D1/DL | TH23/OAL | FOV/EFL | TTL/EFL | |
| First embodiment | 0.721 | 2.956 | 0.188 | 11.054 | 22.778 |
| Second embodiment | 0.700 | 3.091 | 0.177 | 11.077 | 24.184 |
| Third embodiment | 0.750 | 2.942 | 0.243 | 10.917 | 22.775 |
| Fourth embodiment | 0.710 | 2.841 | 0.257 | 11.025 | 23.805 |
| Fifth embodiment | 0.704 | 2.751 | 0.245 | 10.943 | 23.707 |
| Sixth embodiment | 0.676 | 2.659 | 0.156 | 9.059 | 20.234 |
| Seventh embodiment | 0.673 | 2.822 | 0.176 | 9.045 | 20.067 |
| Eighth embodiment | 0.745 | 2.976 | 0.145 | 10.826 | 22.945 |
| Ninth embodiment | 0.748 | 2.985 | 0.212 | 11.052 | 22.989 |
| Tenth embodiment | 0.712 | 2.781 | 0.221 | 10.998 | 22.901 |
| Eleventh embodiment | 0.712 | 2.905 | 0.127 | 11.083 | 23.033 |
| Twelfth embodiment | 0.697 | 2.871 | 0.247 | 10.932 | 22.410 |
| Thirteenth embodiment | 0.706 | 2.971 | 0.240 | 11.021 | 23.760 |
| Fourteenth embodiment | 0.722 | 3.045 | 0.212 | 11.021 | 23.136 |
| Fifteenth implementationExamples of the embodiments | 0.722 | 2.898 | 0.241 | 10.958 | 23.004 |
| Sixteenth embodiment | 0.696 | 2.808 | 0.180 | 11.034 | 23.851 |
In summary, the fixed focus projection lens according to the embodiments of the invention can maintain good image quality of the fixed focus projection lens under the condition of the system total length limitation according to the arrangement and condition relationship of the optical elements described in the present specification. In addition, the embodiment of the invention also divides the fixed-focus projection lens into the first lens group, the second lens group and the third lens group, so that the focusing can be easier, and the production efficiency and the manufacturing yield of the lens are improved.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A fixed focus projection lens, comprising:
the first lens group and the second lens group are separated by the position with the smallest inner diameter of the lens barrel, and are sequentially arranged from the enlargement side to the reduction side of the fixed-focus projection lens;
wherein the first lens group comprises 6 to 8 lenses with diopter and comprises two aspheric lens surfaces;
the diopter of the second lens group is positive, the second lens group comprises 5-8 lenses with diopter and comprises two gluing surfaces, and the lenses with diopter are spherical lenses; and is provided with
The fixed-focus projection lens meets the following conditions:
0.6<D1/OAL<0.8；
wherein D1 is the diameter of the first lens counted from the magnification side of the fixed focus projection lens, and OAL is the shortest distance between the outermost lens surfaces at both ends of the fixed focus projection lens.
2. A fixed focus projection lens, comprising:
a first lens group, a second lens group and a third lens group, which are arranged in order from a magnification side to a reduction side of the fixed-focus projection lens, and are fixed lens groups, and the second lens group is a movable lens group;
the minimum position of the inner diameter of the lens barrel of the fixed-focus projection lens is arranged between the second lens group and the outermost lens of the third lens group;
the first lens group includes two aspherical lens surfaces;
the third lens group comprises 6 to 9 lenses with diopter, the lenses with diopter are all spherical lenses, and the third lens group comprises two adjacent lens surfaces, wherein the two adjacent lens surfaces at each position respectively meet the following conditions: a ratio of a difference in radius of curvature between the adjacent lens surfaces to a larger radius of curvature in the adjacent lens surfaces is <0.01;
and the fixed focus projection lens comprises 11 to 16 lenses with diopter in total, and the fixed focus projection lens satisfies the following conditions:
2<D1/DL<4；
wherein D1 is the diameter of the first lens counted from the enlargement side of the fixed focus projection lens, and DL is the diameter of the last lens counted from the enlargement side of the fixed focus projection lens.
3. A fixed focus projection lens, comprising:
11 to 15 sheets of lenses having diopter, wherein the fixed focus projection lens is sequentially arranged from the enlargement side to the reduction side as a fixed first lens group, a movable second lens group and a fixed third lens group; and
a stop provided between the last lens counted from the magnification side in the second lens group and the last lens counted from the magnification side in the third lens group;
the first lens group includes two aspherical lens surfaces;
the third lens group comprises 6 to 9 lenses with diopter, and the third lens group comprises lens combinations corresponding to the shapes of two pairs of adjacent lens surfaces;
and the fixed focus projection lens meets the following two conditions:
(1) 2-woven fabric D1/DL <4; and
(2)0.06<TH23/OAL<0.32；
wherein D1 is a diameter of a first lens counted from the magnified side of the fixed focus projection lens, DL is a diameter of a last lens counted from the magnified side of the fixed focus projection lens, TH23 is a shortest distance between the second lens group and the third lens group, and OAL is a distance on an optical axis between outermost lens surfaces at both ends of the fixed focus projection lens.
4. A fixed focus projection lens as claimed in claim 3 wherein the shape of the adjacent lens surfaces corresponds to a lens combination where the ratio of the difference in the radii of curvature between the adjacent lens surfaces to the larger radius of curvature of the adjacent lens surfaces is <0.01.
5. The fixed-focus projection lens as claimed in any one of claims 1 to 3, wherein the fixed-focus projection lens is a glass-plastic hybrid lens.
6. The fixed focus projection lens as claimed in any one of claims 1 to 3, wherein the fixed focus projection lens satisfies at least one of the following conditions:
(1) The ratio of the total system length of the fixed-focus projection lens to the effective focal length of the fixed-focus projection lens is in the range of 19 to 25;
(2) The ratio of the half field angle of the fixed-focus projection lens to the effective focal length of the fixed-focus projection lens is in the range of 9-11.5;
(3) The total system length of the fixed-focus projection lens is less than 130 mm;
(4) And the aperture value of the fixed-focus projection lens is in a range less than 2.
7. The fixed focus projection lens as claimed in any one of claims 1 to 3, wherein the fixed focus projection lens satisfies at least one of the following conditions:
(1) The fixed focus projection lens at least comprises two plastic lenses;
(2) The first lens of the fixed focus projection lens counted from the amplification side is an aspheric lens.
8. The fixed focus projection lens of claim 1, wherein an abbe number of a positive diopter lens among the cemented lenses of the fixed focus projection lens is greater than 70, and an abbe number of a negative diopter lens among the cemented lenses of the fixed focus projection lens is less than 40 and a refractive index is greater than or equal to 1.8.
9. The fixed focus projection lens of claim 1 wherein the second lens group comprises at least 4 positive power lenses.
10. The fixed focus projection lens of claim 2 or 3, wherein the fixed focus projection lens satisfies at least one of the following conditions:
(1) The first lens group comprises at least two negative diopter lenses;
(2) The first lens group does not include a cemented lens;
(3) The surface of the second lens group closest to the reduction side is a convex surface, and the surface diopter thereof is positive.
11. A fixed focus projection lens as claimed in claim 2 or 3, wherein a light valve is arranged on the reduction side of the fixed focus projection lens, and the fixed focus projection lens is focused in the following manner:
the first lens group moves on the optical axis relative to the light valve, and the second lens group and the third lens group are fixed relative to the light valve;
the second lens group moves on the optical axis relative to the light valve, and the first lens group and the third lens group are fixed relative to the light valve; or
The first lens group and the second lens group move on the optical axis relative to the light valve, respectively, and the third lens group is fixed relative to the light valve.
12. The fixed focus projection lens as claimed in any one of claims 1 to 3, wherein the first lens of the fixed focus projection lens counted from the magnification side is a negative diopter lens.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW110122472 | 2021-06-18 | ||
| TW110122472A TWI814018B (en) | 2021-06-18 | 2021-06-18 | Fixed-focus projection lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115494686A true CN115494686A (en) | 2022-12-20 |
Family
ID=84464837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110881476.0A Pending CN115494686A (en) | 2021-06-18 | 2021-08-02 | Fixed focus projection lens |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2023000974A (en) |
| CN (1) | CN115494686A (en) |
| TW (1) | TWI814018B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117908234A (en) * | 2024-03-19 | 2024-04-19 | 武汉宇熠科技有限公司 | Wide-angle projection lens with variable working distance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200417750A (en) * | 2003-03-11 | 2004-09-16 | Ind Tech Res Inst | Tenfold zooming wide-angle camera lens |
| JP2009186790A (en) * | 2008-02-07 | 2009-08-20 | Fujinon Corp | Projection lens and projection display device with the same |
| CN111522131A (en) * | 2019-02-01 | 2020-08-11 | 扬明光学股份有限公司 | Fixed focus lens and manufacturing method thereof |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010020086A (en) * | 2008-07-10 | 2010-01-28 | Panasonic Corp | Wide angle lens and projector using the same |
| JP5479926B2 (en) * | 2010-01-27 | 2014-04-23 | 富士フイルム株式会社 | Projection lens and projection display device using the same |
| JPWO2012160786A1 (en) * | 2011-05-23 | 2014-07-31 | 富士フイルム株式会社 | Variable magnification optical system for projection and projection display device |
| JP2013195636A (en) * | 2012-03-19 | 2013-09-30 | Casio Comput Co Ltd | Projection optical system and projection-type display device |
| WO2013157237A1 (en) * | 2012-04-18 | 2013-10-24 | 富士フイルム株式会社 | Projection lens and projection-type display device |
| JP7093613B2 (en) * | 2017-05-15 | 2022-06-30 | リコーインダストリアルソリューションズ株式会社 | Zoom lens for projection and image projection device |
| TWI823882B (en) * | 2018-12-14 | 2023-12-01 | 光芒光學股份有限公司 | Lens and fabrication method thereof |
| TW202102890A (en) * | 2019-07-05 | 2021-01-16 | 光芒光學股份有限公司 | Optical lens and fabrication method thereof |
| TWI818095B (en) * | 2019-10-03 | 2023-10-11 | 光芒光學股份有限公司 | Optical lens and fabrication method thereof |
-
2021
- 2021-06-18 TW TW110122472A patent/TWI814018B/en active
- 2021-08-02 CN CN202110881476.0A patent/CN115494686A/en active Pending
- 2021-08-27 JP JP2021139081A patent/JP2023000974A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200417750A (en) * | 2003-03-11 | 2004-09-16 | Ind Tech Res Inst | Tenfold zooming wide-angle camera lens |
| JP2009186790A (en) * | 2008-02-07 | 2009-08-20 | Fujinon Corp | Projection lens and projection display device with the same |
| CN111522131A (en) * | 2019-02-01 | 2020-08-11 | 扬明光学股份有限公司 | Fixed focus lens and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202300979A (en) | 2023-01-01 |
| JP2023000974A (en) | 2023-01-04 |
| TWI814018B (en) | 2023-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107272144B (en) | Optical imaging system | |
| CN108279481B (en) | Optical imaging system | |
| US6844991B2 (en) | Fisheye lens | |
| KR102442815B1 (en) | Optical lens | |
| CN108267837B (en) | Optical imaging system | |
| CN107643582B (en) | Optical imaging system | |
| CN108020908B (en) | Optical imaging system | |
| JPH04267212A (en) | Ultra wide angle lens | |
| CN107179597B (en) | Optical imaging system | |
| CN110275276B (en) | Optical imaging system | |
| WO2013157237A1 (en) | Projection lens and projection-type display device | |
| CN107589519B (en) | Optical imaging system | |
| JPH05249374A (en) | Zoom lens with wide field angle | |
| JP2016050989A (en) | Projection zoom lens and projection display device | |
| CN213276108U (en) | Imaging lens and imaging device | |
| CN116400486B (en) | optical lens | |
| CN110095926B (en) | Projection lens and projection display device using the same | |
| CN116520541A (en) | Zoom lens | |
| CN115494686A (en) | Fixed focus projection lens | |
| JPH10301021A (en) | Small-sized lens | |
| CN113885185B (en) | Projection lens | |
| JP5642903B2 (en) | Projection zoom lens and projection display device | |
| JPH0218511A (en) | Zoom lens | |
| CN212379642U (en) | Optical imaging system | |
| CN212460161U (en) | Optical imaging system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |