857 results about "Projection lens" patented technology

The invention provides a projection lens, which comprises seven lenses from a projection surface to an image source surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power and a fifth lens with negative focal power, the second lens has positive focal power; the surface of the image source side of the third lens is a convex surface; the surface of the projection side of the fourth lens is a concave surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the projection side of the fifth lens is a concave surface, and the surface of the image source side of the fifth lens is a concave surface; the surface of the projection side of the sixth lens is a convex surface, and the surface of the image source side of the sixth lens is a convex surface; the surface of the projection side of the seventh lens is a convex surface, and the curvature radius R7 of the surface of the projection side of the fourth lens and the curvature radius R8 of the surface of the image source side of the fourth lens meet the formula:-0.5 lt; (R7-R8) / (R7 + R8) lt; and-0.1. According to the projection lens provided by the invention, the projection quality of the projection lens is improved through the reasonable configuration of the surface types of the lenses and the reasonable matching of the focal power.

The invention provides a projection lens, which comprises seven lenses from a projection surface to an image source surface along an optical axis: a first lens with negative focal power; the second lens has positive focal power; the surface of the image source side of the third lens is a convex surface; the surface of the projection side of the fourth lens is a concave surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the image source side of the fifth lens is a concave surface; the surface of the projection side of the sixth lens is a convex surface, and the surface of the image source side of the sixth lens is a convex surface; the surface of the projection side of the seventh lens is a convex surface, and the surface of the image source side of the seventh lens is a convex surface; the surface curvature radius R7 of the projection side of the fourth lens and the surface curvature radius R8 of the image source side of the fourth lens meet the following formula:-0.6 lt; (R7-R8) / (R7 + R8) lt; 0. According to the projection lens provided by the invention, the projection quality of the projection lens is improved through the reasonable configuration of the surface types of the lenses and the reasonable matching of the focal power.

The invention provides a projection lens, which sequentially comprises a first lens with positive focal power from a projection surface to an image source surface along an optical axis, a second lens with negative focal power and a third lens with positive focal power from the projection surface to the image source surface, the surface of the projection side of the second lens is a convex surface, and the surface of the image source side of the second lens is a concave surface; the surface of the projection side of the third lens is a concave surface, and the surface of the image source side of the third lens is a concave surface; the surface of the projection side of the fourth lens is a convex surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the image source side of the fifth lens is a convex surface; the surface of the projection side of the sixth lens is a convex surface; a prism; a protective glass; a piece of plate glass with changeable positions is arranged between the prism and the protective glass, and the plate glass can be located at a first position or a second position through a switching device. According to the projection lens provided by the invention, clear imaging at two different projection distances is realized through switching of the plate glass, and switching between a close shot and a long shot is completed.

The invention provides a long-exit-pupil-distance broadband common-aperture composite simulation optical system, and belongs to the technical field of target scene composite analog simulation. A broadband objective lens group A, a space beam combiner group B and a long-wave infrared projection lens group D are sequentially arranged in the optical system from left to right along light, a visible light projection lens group C is located on the upper side of the space beam combiner group B, and a long-wave infrared projection lens group C is located on the lower side of the space beam combiner group B; a visible light image plane is positioned on the right side of the visible light projection lens group C; the medium-wave infrared projection lens group E is located on the lower side of the space beam combiner lens group B, the medium-wave infrared image surface is located on the lower side of the medium-wave infrared projection lens group E, the long-wave infrared image surface is located on the right side of the medium-wave infrared image surface, and the exit pupil position is located on the left side of the broadband objective lens group A; the problem that a single-channel target modulo system only adapts to simulation of imaging guidance equipment of a specific wave band and is not suitable for semi-physical simulation tests of three-mode composite imaging guidance equipment and two-mode composite imaging guidance equipment is solved.

The invention discloses a reflector structure for a projection imaging lens, which comprises a reflector body, the reflector body is placed in an optical projection imaging lens with more than two lenses, and the reflector body comprises a middle light-passing area, a middle light-passing area and a middle light-passing area, so that light of the optical projection imaging lens is emitted through the middle light-passing area to become direct emergent light; the upper end of the first reflecting region is small and the lower end is large; the upper end of the second reflecting region is large and the lower end is small; the optical projection imaging lens is vertically placed, the light source or the image source is arranged below the optical projection imaging lens, and the lens is arranged above the optical projection imaging lens; the reflector body is configured to be matched with a circular projection imaging lens in rotational symmetry or a projection imaging lens in a non-rotational symmetry structure. The surface brightness and uniformity of the light-emitting surface of the projection lens are improved.

The invention provides a projection lens, which sequentially comprises a first lens with positive focal power from a projection surface to an image source surface along an optical axis, a second lens with negative focal power and a third lens with positive focal power from the projection surface to the image source surface, the surface of the projection side of the second lens is a convex surface, and the surface of the image source side of the second lens is a concave surface; the surface of the projection side of the third lens is a concave surface, and the surface of the image source side of the third lens is a convex surface; the surface of the projection side of the fourth lens is a concave surface; the surface of the projection side of the fifth lens is a concave surface, and the surface of the image source side of the fifth lens is a convex surface; the surface of the projection side of the sixth lens is a convex surface, and the surface of the image source side of the sixth lens is a convex surface; a prism; a protective glass; plate glass is arranged between the prism and the protective glass, and the plate glass can be located at a first position or a second position through a switching device. According to the projection lens provided by the invention, clear imaging at two different projection distances is realized through switching of the plate glass, and switching between a close shot and a long shot is completed.

A wide angle zoom projection lens, which from the magnifying side to the narrowing side of the lens sequentially comprising: a first lens group with negative diopter, a second lens group, a third lens group with positive diopter, a fourth lens group with positive diopter, a fifth lens group with positive diopter, a sixth lens group with positive diopter, and an aperture in the lens; during the zooming, the first lens group and the sixth lens group are fixed, the second to fifth lens groups move along the optical axis to achieve changes in focal length; The front lens of the first lens group closest to the magnifying side of the lens is an aspherical lens with negative diopter to achieve a wide angle effect.

The invention provides a projection lens, which comprises seven lenses from a projection surface to an image source surface along an optical axis: a first lens with negative focal power; the surface of the projection side of the second lens is a convex surface, and the surface of the image source side of the second lens is a convex surface; the surface of the image source side of the third lens is a convex surface; the surface of the projection side of the fourth lens is a concave surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the image source side of the fifth lens is a concave surface; the surface of the projection side of the sixth lens is a convex surface, and the surface of the image source side of the sixth lens is a convex surface; and the surface of the projection side of the seventh lens is a convex surface. According to the projection lens provided by the invention, the projection quality of the projection lens is improved through the reasonable configuration of the surface types of the lenses and the reasonable matching of the focal power.

The invention relates to the technical field of optics, in particular to a projection lens, a projection system and electronic equipment. The projection lens comprises a first lens group, an aperture diaphragm and a second lens group which are sequentially arranged from a projection surface to an image source surface along an optical axis, the first lens group has negative focal power, and the second lens group has positive focal power; the first lens group consists of a first lens, a first sub-lens group and a diaphragm front lens which are sequentially arranged from a projection surface to an image source surface along an optical axis; the first sub-lens group comprises at least one lens with negative focal power; the first lens and the diaphragm front lens respectively have positive focal power, and the first sub-lens group has negative focal power; the second lens group consists of a diaphragm rear lens and a second sub-lens group which are sequentially arranged from the projection surface to the image source surface along the optical axis; the second sub-lens group has positive focal power and comprises a group of balsaming lenses with positive focal power, and the diaphragm rear lens has negative focal power. The focusing range of the projection lens is larger than or equal to 500 mm.

The invention provides a projection lens, which comprises seven lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from a projection surface to an image source surface along an optical axis, the second lens has positive focal power; the surface of the image source side of the third lens is a convex surface; the surface of the projection side of the fourth lens is a concave surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the image source side of the fifth lens is a concave surface; the surface of the projection side of the sixth lens is a convex surface, and the surface of the image source side of the sixth lens is a convex surface; the seventh lens has positive focal power; wherein the surface curvature radius R1 of the projection side of the first lens and the surface curvature radius R2 of the image source side of the first lens meet the following formula:-0.8 lt; (R1 + R2) / (R1-R2) lt; and 0.5. According to the projection lens provided by the invention, the projection quality of the projection lens is improved through the reasonable configuration of the surface types of the lenses and the reasonable matching of the focal power.

The invention provides a projection lens, which comprises five lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from a projection surface to an image source surface along an optical axis, the surface of the projection side of the second lens is a convex surface, and the surface of the image source side of the second lens is a convex surface; the surface of the projection side of the third lens is a concave surface, and the surface of the image source side of the third lens is a concave surface; the surface of the projection side of the fourth lens is a convex surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the projection side of the fifth lens is a convex surface, and the surface of the image source side of the fifth lens is a convex surface; wherein the real image height IH corresponding to the maximum field angle of the projection lens and the effective focal length f of the projection lens meet the following conditions: 0.6 lt; iH / flt; and 0.8. According to the projection lens provided by the invention, the projection quality of the projection lens is improved through the reasonable configuration of the surface types of the lenses and the reasonable matching of the focal power.

The invention relates to the technical field of optical imaging, and discloses an AR optical projection machine and an optical display system, the projection machine comprises a projection lens group, a color combination prism assembly and a three-color display array; the projection lens group comprises a diaphragm STO, a first lens, a second lens, a third lens and a fourth lens. The color combination prism assembly comprises a plurality of prisms which are glued with one another, and a film coating structure which is used for reflecting red light and blue light and transmitting green light is arranged on each prism; the three-color display array comprises three display chips; wherein the FOV (field of view) of the AR optical projection machine is greater than or equal to 30 degrees and less than or equal to 40 degrees; the ratio of the total optical length TTL of the AR optical projection machine to the effective focal length f of the system meets the condition that TTL / f is larger than or equal to 5.0 and smaller than or equal to 7. The field angle of the system is limited within the range of 30-40 degrees, the ratio of the total optical length TTL to the effective focal length f is kept within 5.0-7.7, an imaging field meeting the AR application requirement can be obtained within the limited optical path length, meanwhile, the overall compactness of the optical system is considered, and the optical system can be more easily integrated into small-size near-to-eye display equipment.

The invention provides a projection lens, which comprises seven lenses from a projection surface to an image source surface along an optical axis: a first lens with negative focal power; the second lens has positive focal power; the surface of the image source side of the third lens is a convex surface; the surface of the projection side of the fourth lens is a concave surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the projection side of the fifth lens is a convex surface, and the surface of the image source side of the fifth lens is a concave surface; the surface of the projection side of the sixth lens is a convex surface, and the surface of the image source side of the sixth lens is a convex surface; the seventh lens has positive focal power; the surface curvature radius R7 of the projection side of the fourth lens and the surface curvature radius R8 of the image source side of the fourth lens meet the following formula:-0.6 lt; (R7-R8) / (R7 + R8) lt; 0. According to the projection lens provided by the invention, the projection quality of the projection lens is improved through the reasonable configuration of the surface types of the lenses and the reasonable matching of the focal power.

The application provides a projection lens, which comprises eight lenses in sequence along an optical axis from a projection surface to an image source surface, and the eight lenses comprise: a first lens with positive focal power, the projection side of which is a convex surface; a second lens with negative focal power, the image source side of which is a concave surface; a third lens with negative focal power, the projection side of which is a convex surface and the image source side of which is a concave surface; a fourth lens with positive focal power, the projection side of which is a convex surface; a fifth lens with negative focal power, both the projection side and the image source side of which are concave surfaces; a sixth lens with positive focal power, both the projection side and the image source side of which are convex surfaces; a seventh lens with positive focal power, both the projection side and the image source side of which are convex surfaces; and an eighth lens with positive focal power, both the projection side and the image source side of which are convex surfaces. The projection lens provided by the application has small distortion, high resolution, low aberration, high relative luminance and good projection effect through reasonable configuration of the surface types of the lenses and reasonable matching of the focal powers.

The invention relates to a pixelated vehicle lamp optical assembly, a vehicle lamp and a vehicle lamp illumination method. The pixelated vehicle lamp optical assembly comprises a light source part, the light source part comprises a colored light source and a white light source, the colored light source can output colored light beams, and the white light source can output white light beams; the projection lens can receive the colorful light beams or the white light beams output by the light source part, so that the pixelated automobile lamp optical assembly outputs white light projection or colorful projection; wherein the pixelated automobile lamp optical assembly has a first state or a second state, in the first state, the optical axis of the projection lens corresponds to the color light source, and the optical axis of the projection lens does not correspond to the white light source, so that the color light beam directly outputs first optical projection along the optical axis of the projection lens.

An achromatic imaging optic (20) is used to image an output field (16a) along a beam path (23) of the imaging optic (20) into a target field (14) for use in DUV microlithography. The imaging optic (20) has a plurality of lenses (L1 to L13), each containing less than 5% lead oxide. At least one of the lenses (L5, L7, L9) is made of a high-dispersion optical material with an Abbe number less than 50. At least one of the lenses (L1 to L4, L6, L8, L10 to L13) is made of a low-dispersion optical material with an Abbe number greater than 50. This results in an imaging optic with simplified manufacturing. Depending on the design, the imaging optics can be part of an optical system of a projection exposure system as an illumination lens (20) or as a projection lens.

The invention relates to the technical field of projection modules, and particularly discloses an LCOS laser projection module, which comprises a laser light source module, a laser speckle eliminator, a reflector, a diffuser, a collimating lens, a fly-eye lens, a relay lens, a first linear polarizer, a polarizing beam splitter, an LCOS chip, a second linear polarizer and a projection lens which are sequentially arranged along a light transmission path, the laser light source module is provided with a light source optical axis and is used for emitting light, and the light is projected by the projection lens after being modulated along a light transmission path to form a projection image. The light emitted by the laser light source has the advantages of narrow divergence angle, small light-emitting area and good light concentration and collimation, the resolution of a projected image can be improved, the projected image is bright in color and high in definition, and the requirements of simple structure and small size are met. Meanwhile, the laser speckle can be eliminated through the matching of the laser speckle eliminator and the diffusion sheet, and the projection image can meet the high contrast through the existence of the first linear polarizer and the second linear polarizer.

A lighting device for a motor vehicle, in particular a high-definition headlamp, includes an imaging component that has an active surface on which light-emitting diodes or laser diodes are arranged in a matrix to generate pixels in a light distribution in a targeted manner, and a projection lens with which the light emitted from the active surface is projected outward from the motor vehicle when the lighting device is in operation. The lighting device is designed to switch the projection lens from a first setting to a second and from the second setting to the first. The projection lens has a first focal length in the first setting, and a second focal length in the second setting, which is greater than the first focal length.

The invention relates to an optical element, in particular a lens (1) or a mirror, preferably for a semiconductor technology system, in particular for a lighting system or for a projection lens of a projection exposure system, comprising: a substrate (2), and a coating (3) which is applied to a surface (2a) of the substrate (2). The coating (3) has at least one refractive layer (4) with a location-dependent varying thickness (d(x,y)), wherein a minimum thickness (dMin) of the refractive layer (4) is at least 5 ΔB, preferably at least 10 ΔB, particularly preferably at least 15 ΔB, and wherein a difference (dMax- dMin) between a maximum thickness (dMax) and the minimum thickness (dMin) of the refractive layer (4) is greater than ΔB, preferably greater than 2 ΔB, particularly greater than 3 ΔB, where ΔB denotes the useful wavelength of the optical element (1).The invention also relates to an optical system, preferably a semiconductor technology system, comprising: a beam source for providing useful radiation at a useful wavelength (<B), preferably in the DUV wavelength range, in particular at 468 nm, 365 nm, 248 nm, 193 nm or 157 nm, and at least one optical element (1) designed as described above.

The invention relates to a vehicle-mounted projection lens and a vehicle, and the projection lens comprises a first lens which has negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; the fifth lens element with negative refractive power has a concave object-side surface and a concave image-side surface. A sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; the third lens is a spherical lens; the vehicle-mounted projection lens satisfies the following conditions: 300 lt; dlt; 3500, 3500. The vehicle-mounted projection lens and the vehicle obtained by the invention have the following advantages: the vehicle-mounted projection lens is not influenced by temperature change, an image can be kept clear and basically free of chromatic aberration when being lightened, the field angle is large, six lenses are adopted, the number of the lenses is small, the structure is compact, and the assembly is more convenient.

The invention relates to a lighting unit for a motor vehicle, comprising: a light source row (1) emitting light rays (1a); a support (6) on which the rows of light sources are arranged; a primary lens (2) having an optical axis (4) and a first incident surface (5); and a projection lens (3). The row of light sources comprises light sources that can be individually activated and aligned in a first direction (d1). The support forms an angle alpha with the optical axis other than 90 degrees. The first incident surface includes a planar upper portion (5a), a planar lower portion (5b), and a connecting portion (5c). The lower portion is offset relative to the upper portion with respect to the optical axis. The upper portion and the lower portion are connected by a connecting portion.

In a projection exposure method for exposing a substrate arranged in the region of an image plane of a projection lens with at least one image of a pattern arranged in the region of an object plane of the projection lens, using radiation from a wavelength range around a design wavelength < 260 nm, a substrate (SUB) is coated with a relatively thick radiation-sensitive photoresist layer (RS) and exposed using a projection lens (PO). This lens produces a focus at a design focus position (FOCO) at the design wavelength and, for other wavelengths outside the wavelength range, offset focus positions from an axially extended focus area (ΔFOC) around the design focus position (FOCO). The projection lens is designed as a single-waisted or double-waisted system.During an exposure time interval, different wavelengths from the wavelength range around the design wavelength are used such that the axial extent of the focus area is at least as large as the layer thickness. The projection lens is optically corrected for chromatic aberration (CHV) such that, in the region of the design wavelength, the image scale is essentially independent of the wavelength, so that a change in wavelength of 1 picometer results in a maximum variation of 2 nm between the position of an image point corresponding to an object point within an image field.

In a projection exposure method for exposing a substrate arranged in the area of ​​an image plane of a projection lens with at least one image of a pattern arranged in the area of ​​an object plane of the projection lens with radiation from a wavelength range around a design wavelength < 260 nm, a projection lens (PO) is used which is optically corrected such that at the design wavelength a focus is generated in a design focus position (FOC0) and for other wavelengths from the wavelength range offset focus positions are generated from an axially extended focus area (ΔFOC) around the design focus position (FOC0).The projection lens has a wavefront manipulation system (WFM) for controllably influencing the wavefront of the projection radiation extending from the object plane to the image plane, wherein the wavefront manipulation system (WFM) has at least one manipulator which, in response to control signals from a control unit within a usable setpoint range, undergoes setpoint changes that lead to changes in the wavefront. The method comprises the following steps: . Coating the substrate (SUB) with a radiation-sensitive photoresist layer (RS) having a layer thickness (SD); exposing the photoresist-coated substrate with the image of the pattern using radiation that, under the control of a control unit, has different wavelengths from a wavelength range with a spectral bandwidth around the design wavelength according to a predetermined temporal sequence; synchronizing a wavefront manipulation system (WFM) control with the temporal sequence of radiation of different wavelengths such that a lateral chromatic aberration caused by switching between different wavelengths is at least partially compensated.

The invention belongs to the technical field of projection display, and particularly relates to a micro-projection lens and projection equipment, the micro-projection lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis direction, the first lens, the second lens and the fifth lens respectively have positive focal power, and the third lens and the fourth lens respectively have negative focal power; wherein under the same temperature variation, the focal power variation of the second lens is smaller than the other focal power variation; the focal power phi 2 of the second lens and the focal power phi 3 of the third lens meet the condition that phi 2 / phi 3 is greater than or equal to 0.5 and less than or equal to 0.7; and / or the effective focal length f2 of the second lens and the effective focal length f3 of the third lens respectively satisfy the following conditions with the total effective focal length EFL: 0.5 < = f2 / EFL < = 1.0, and-1.0 < = f3 / EFL < =-0.2. The micro projection lens is good in temperature drift stability, is not liable to defocus after being used for a long time, and improves the use experience of a user.

Microlithographic projection lens with a plurality of lenses (20A-20J, 24, 25), wherein the lenses (20A-20J, 24, 25) define an imaging beam path (17) between an object plane (12) and an image plane (21), and wherein the lenses (20A-20J, 24, 25) are designed to image a photomask (13) arranged in the object plane (12) onto a lithographic object (15) arranged in the image plane (21). The projection lens comprises a frame device (23) wherein support feet (26A-26H, 46A-46H, 47A-47H) are attached to the frame device (23) and wherein the lenses (20A-20J, 24, 25) are supported by the support feet (26A-26H, 46A-46H, 47A-47H), wherein a first support foot (46A-46H) supports a first lens (24), wherein a second support foot (47A-47H) supports a second lens (25) and wherein a third support foot (26A-26H) supports a third lens (20A-20J).The first support foot (46A-46H) is attached to the frame device (23) at the same angular position (30) as the second support foot (47A-47H). The third support foot (26A-26H) is arranged at an angular position in which neither the first support foot (46A-46H) of the first lens (24) nor the second support foot (47A-47H) of the second lens (25) is located.

The invention discloses a projection lens and a vehicle-mounted head-up display system. The projection lens comprises a projection objective lens front group, a diaphragm and a projection objective lens rear group which are sequentially arranged from an object plane to an image plane and are coaxially arranged, the projection objective lens front group comprises a first negative lens, a first positive lens and a second negative lens which are sequentially arranged from an object plane to a diaphragm and are coaxially arranged; wherein the first negative lens and the second negative lens are meniscus concave lenses, the concave surface of the first negative lens faces the first positive lens, and the concave surface of the second negative lens faces the diaphragm; and the projection objective lens rear group comprises a third negative lens, a second positive lens and a third positive lens which are sequentially arranged from the diaphragm to the image plane and are coaxially arranged. According to the technical scheme, the projection of an image to be projected is completed by using six lenses, compared with the prior art, the number of the lenses is small, the number of the contact surfaces of the lens glass surface and air is small, the light energy loss is greatly reduced, the light transmission efficiency is greatly improved, and meanwhile, the cost is correspondingly reduced due to the small number of the lenses.

The invention relates to the technical field of optics, in particular to an optical engine and electronic equipment. According to the optical engine provided by the invention, the light emitting direction of the light source module is the same as the light emitting direction of the projection lens, so that the light emitting direction of the light source module is the same as the light emitting direction of the projection lens, or an included angle is formed between the light emitting direction of the light source module and the light emitting direction of the projection lens; due to the arrangement of the dodging module, a gap is formed between the light source module and the projection lens, the heat transfer distance is enlarged, the influence of heat of the light source module on the temperature of components of the projection lens is reduced, and the temperature drift of the optical engine is reduced.

To prevent fusion and discoloration in a control end part.SOLUTION: A vehicular headlight includes a light source for emitting light, a reflector for reflecting the light emitted from the light source, a shade for blocking part of the light reflected by the reflector, and a projection lens for projecting the light reflected by the reflector. The shade is provided with a control end part positioned on the light source side, and the control end part includes a reflection control surface subjected to reflection processing in which a focal point of the light is positioned on the surface or in the vicinity, and an inclined plane subjected to reflection processing, which continues to the edge on the light source side in the reflection control surface. The inclined plane is inclined relative to the reflection control surface so that the inclined plane is displaced downward as it is separated from the reflection control surface.SELECTED DRAWING: Figure 2

The invention provides a projection device and a projection correction method. The projection device comprises a projection module, a zoom projection lens, a sensor, a focal length adjustment module, a zoom ratio adjustment module, a detection module and a control unit. The zoom ratio adjusting module adjusts the position of a lens group in the zoom projection lens so as to adjust the zoom ratio of the projection image generated by the image light beam generated by the projection module projected by the zoom projection lens; the control unit calculates a focal length adjustment parameter by using an automatic focusing conversion function according to a detection value generated by the displacement of the lens group detected by the detection module and the projection distance sensed by the sensor, and controls the focal length adjustment module to adjust the imaging focal length of the zoom projection lens according to the focal length adjustment parameter. According to the projection device and the projection correction method provided by the invention, a good focusing effect can be achieved in a scene matched with any zoom ratio within an effective projection distance.

The present disclosure provides a zoom projection lens and an electronic device. The zoom projection lens includes: a first zoom lens group, a second zoom lens group, a compensation lens group, and a fixed lens group, sequentially along an optical axis direction from a zoom-in side to a zoom-out side; the first zoom lens group has a positive focal power, the second zoom lens group has a negative focal power, the compensation lens group has a positive focal power, and the fixed lens group has a positive focal power; and the first zoom lens group, the second zoom lens group, and the compensation lens group are movable along the optical axis.