CN217543510U - Projection lens and projector - Google Patents
Projection lens and projector Download PDFInfo
- Publication number
- CN217543510U CN217543510U CN202220766736.XU CN202220766736U CN217543510U CN 217543510 U CN217543510 U CN 217543510U CN 202220766736 U CN202220766736 U CN 202220766736U CN 217543510 U CN217543510 U CN 217543510U
- Authority
- CN
- China
- Prior art keywords
- lens
- projection
- biconvex
- distance
- biconcave
- 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.)
- Active
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The application discloses projection lens and projecting apparatus relates to optical components and parts technical field. The projection lens comprises a rear lens group and a front lens group which are sequentially arranged along the incident direction of projection light; an aperture diaphragm is arranged between the rear lens group and the front lens group; the rear lens group comprises a first biconvex lens, a second biconvex lens, a third biconvex lens, a first biconcave lens and a second biconcave lens which are sequentially arranged along the incidence direction of the projection light; the front lens group comprises a fourth biconvex lens, a first negative crescent lens and a second negative crescent lens which are sequentially arranged along the incidence direction of the projection light; wherein, the projection ratio of the projection lens is 1.45. The projection lens of this application ability can realize 1.45 ~ 1.55 throw ratio, has filled the blank that lacks the projection lens of this throw ratio scope in the present market.
Description
Technical Field
The application relates to the technical field of optical components, in particular to a projection lens and a projector.
Background
The miniature projector is a first choice of more and more projection display solutions by virtue of the characteristics of small volume, convenience in carrying and the like. For example, the micro-projector can be integrated into a mobile phone, such as a common electronic device like iPad. The throw ratio is an important performance index of the micro projector, and the throw ratio is the ratio of the projection distance to the width of the projection screen, and the smaller the throw ratio is, the larger the projection screen is. With the continuous development of projection technology, the projection ratio of the micro projector is smaller and smaller, which makes the application range of the micro projector wider.
However, the throw ratio is still lacking in the market at present in 1.45:1 to 1.55:1, it is necessary to provide a projection lens and a projector having a projection ratio in this range to fill the gap in the market.
SUMMERY OF THE UTILITY MODEL
In view of the above, to solve the above technical problems, the present application provides a projection lens and a projector.
In order to achieve the above object, the present application provides a projection lens including a rear lens group and a front lens group sequentially arranged along an incident direction of projection light; an aperture diaphragm is arranged between the rear lens group and the front lens group;
the rear lens group comprises a first biconvex lens, a second biconvex lens, a third biconvex lens, a first biconcave lens and a second biconcave lens which are sequentially arranged along the incidence direction of the projection light;
the front lens group comprises a fourth biconvex lens, a first negative crescent lens and a second negative crescent lens which are sequentially arranged along the incidence direction of the projection light;
wherein, the projection ratio of the projection lens is 1.45:1 to 1.55:1.
in order to solve the above technical problem, another technical solution adopted by the present application is to provide a projector, which includes a housing and the above projection lens, wherein the projection lens is disposed on the housing.
Has the advantages that: different from the prior art, the projection lens can realize the projection ratio of 1.45-1.55.
Drawings
Fig. 1 is a schematic cross-sectional view illustrating a projection lens according to an embodiment of the disclosure;
FIG. 2 is an optical diagram of an embodiment of a projection lens of the present application;
FIG. 3 is a graph of relative illumination of a projection lens according to the present application;
FIG. 4 is a graph of astigmatism for a projection lens of the present application;
FIG. 5 is a projection of the present application distortion plot of lens.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the present application is described in further detail below with reference to the accompanying drawings and the detailed description. It is to be understood that the described embodiments are merely some embodiments of the present application and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1-2, fig. 1 is a schematic cross-sectional structure diagram of an embodiment of a projection lens of the present application; fig. 2 is an optical path diagram of an embodiment of a projection lens of the present application.
As shown in fig. 1-2, the projection lens 100 includes a rear lens group 130 and a front lens group 150 disposed in order along an incident direction L1 of projection light; rear lens group 130 and front lens group 150 with an aperture stop 140 disposed therebetween. The rear lens group 130 coincides with the optical axis of the front lens group 150.
The rear lens group 130 includes a first biconvex lens 131, a second biconvex lens 132, a third biconvex lens 133, a first biconcave lens 134, and a second biconcave lens 135, which are sequentially disposed along the incident direction L1 of the projection light.
The front lens group 150 includes a fourth biconvex lens 151, a first negative crescent lens 152, and a second negative crescent lens 153, which are sequentially arranged along the incident direction L1 of the projection light. The projection ratio of the projection lens 100 is 1.45.
Through the above manner, the projection lens 100 can realize a throw ratio of 1.45.
Further, the projection lens 100 includes a reflector 160, the front lens group 150 and the reflector 160 are sequentially disposed along the incident direction L1 of the projection light, and the reflector 160 is disposed obliquely with respect to the incident direction L1 of the projection light for deflecting the projection light incident in the incident direction L1 to the exit direction L2.
The projection lens 100 can be applied to projectors such as a household micro-projection projector, a business education projector, a vehicle-mounted projector and an engineering projector, wherein the projection lens 100 can be configured as a periscopic projection lens, the projection lens 100 can further include a projection display device 120, the projection display device 120 can include a spatial light modulator 111 and a light combining prism group 122, the spatial light modulator 111 serves as an imaging target and emits projection light, the light combining prism group 122, a rear lens group 130, an aperture stop 140, a front lens group 150 and a reflector 160 are sequentially arranged on the emission light path of the spatial light modulator 111, the projection light is combined by the light combining prism group 122 and then sequentially enters the rear lens group 130, the aperture stop 140, the front lens group 150 and the reflector 160, and the projection light can be deflected to a screen (not shown) to form a projection image after being reflected by the reflector 160.
Alternatively, as shown in fig. 1-2, the light combining prism set 122 may include a first prism 1221 and a second prism 1222 sequentially arranged along the incident direction L1 of the projection light, and the first prism 1221 and the second prism 1222 cooperate with each other to combine the projection light. It is understood that in other embodiments, the number of prisms in the light combining prism set 122 may be one, three or other number.
Alternatively, as shown in fig. 1-2, the rear lens group 130 and the front lens group 150 may be both glass lenses, and the optical sensitivity of the projection lens 100 can be reduced by adopting an all-glass lens structure, and the processing cost can be reduced at the same time.
Alternatively, as shown in fig. 1-2, the incident surface of the first negative crescent lens 152 and the incident surface of the second negative crescent lens 153 are both concave, and the exit surface of the first negative crescent lens 152 and the exit surface of the second negative crescent lens 153 are both convex.
In this embodiment, the surface numbers are sequentially increased from left to right in FIG. 1 and FIG. 2, the lens design parameters of the projection lens 100 are as shown in table 1 below.
Table 1: lens design parameters of projection lens
With reference to table 1, on the optical axis of the rear lens group 130, as shown by the lens design parameters corresponding to the surface number 13, a distance is formed between the first biconvex lens 131 and the second biconvex lens 132, the distance between the exit surface of the first biconvex lens 131 and the entrance surface of the second biconvex lens 132 is 0.09mm to 0.11mm, for example, the distance between the exit surface of the first biconvex lens 131 and the entrance surface of the second biconvex lens 132 is 0.10mm; as shown in the lens design parameters corresponding to the surface number 11, a space is provided between the second biconvex lens 132 and the third biconvex lens 133, a distance between the exit surface of the second biconvex lens 132 and the entrance surface of the third biconvex lens 133 is 0.09mm to 0.11mm, for example, a distance between the exit surface of the second biconvex lens 132 and the entrance surface of the third biconvex lens 133 is 0.10mm; the third biconvex lens 133 and the first biconcave lens 134 are glued into an integral structure through optical glue, that is, the exit surface of the third biconvex lens 133 and the entrance surface of the first biconcave lens 134 are mutually glued to form a glued lens group, which is also called an achromatic lens group. As shown in the lens design parameters corresponding to the surface number 8, a distance is provided between the first biconcave lens 134 and the second biconcave lens 135, a distance between the exit surface of the first biconcave lens 134 and the entrance surface of the second biconcave lens 135 is 0.46mm to 0.48mm, for example, a distance between the exit surface of the first biconcave lens 134 and the entrance surface of the second biconcave lens 135 is 0.47mm; as shown in the lens design parameters corresponding to the surface number 6, there is a pitch between the second biconcave lens 135 and the fourth biconvex lens 151, and the distance between the exit surface of the second biconcave lens 135 and the entrance surface of the fourth biconvex lens 151 is 3.43mm to 3.45mm, for example, the distance between the exit surface of the second biconcave lens 135 and the entrance surface of the fourth biconvex lens 151 is 3.44mm.
On the optical axis of the rear lens group 130, as shown by the lens design parameters corresponding to the surface number 4, a space is provided between the fourth biconvex lens 151 and the first negative crescent lens 152, the distance between the exit surface of the fourth biconvex lens 151 and the entrance surface of the first negative crescent lens 152 is 2.69mm to 2.71mm, for example, the distance between the exit surface of the fourth biconvex lens 151 and the entrance surface of the first negative crescent lens 152 is 2.70mm; as shown in the lens design parameters corresponding to the surface number 2, there is a distance between the first negative crescent lens 152 and the second negative crescent lens 153, and the distance between the exit surface of the first negative crescent lens 152 and the entrance surface of the second negative crescent lens 153 is 1.29mm to 1.31mm, for example, the distance between the exit surface of the first negative crescent lens 152 and the entrance surface of the second negative crescent lens 153 is 1.30mm.
Specifically, with reference to table 1, the total optical length of the projection lens 100 may be a sum of the pitches in table 1, and the calculation result is 41.31mm, and the optical back intercept of the projection lens 100 is greater than or equal to 19.3mm, that is, the distance from the incident surface of the first biconvex lens 131 to the imaging target surface of the projection lens 100 is greater than or equal to 19.3mm, and specifically, as indicated by the lens design parameter corresponding to the surface number 15, the optical back intercept of the projection lens 100 is 19.36mm. On the optical axis of the rear lens group 130, the total mechanical length of the projection lens 100 excluding the projection display device 120 (for example, in the case that the projection lens 100 does not include the projection display device 120) is 22mm to 23mm, that is, the distance between the projection point of the rear lens group 130 on the optical axis of the rear lens group 130 at the vertex distant from the reflecting mirror 160 in the optical axis direction of the rear lens group 130 and the projection point of the reflecting mirror 160 on the optical axis of the rear lens group 130 at the vertex distant from the rear lens group 130 in the optical axis direction of the rear lens group 130 is 22mm to 23mm, and may be 22.05mm. As described above, the optical back focal length of the projection lens 100 is almost equivalent to the total mechanical length of the projection lens 100 except for the projection display device 120, and can be applied to various projectors. For example, the projection lens 100 may be integrated into a portable terminal such as a tablet computer, a mobile phone, a watch, and a pico projector.
More specifically, referring to table 1, as shown by the lens design parameters corresponding to the surface number 14, on the optical axis of the rear lens group 130, the distance between the incident surface and the exit surface of the first biconvex lens 131 is 2.02mm to 2.04mm, for example, the distance between the incident surface and the exit surface of the first biconvex lens 131 is 2.03mm; as shown in the lens design parameters corresponding to the surface number 12, the distance between the incident surface and the exit surface of the second biconvex lens 132 is 1.92mm to 1.94mm, for example, the distance between the incident surface and the exit surface of the second biconvex lens 132 is 1.93mm; as indicated by the lens design parameters corresponding to the surface number 10, the distance between the incident surface and the exit surface of the third lenticular lens 133 is 2.47mm to 2.49mm, for example, the distance between the incident surface and the exit surface of the third lenticular lens 133 is 2.48mm; as shown in the lens design parameters corresponding to the surface number 9, the distance between the incident surface and the exit surface of the first biconcave lens 134 is 0.49mm to 0.51mm, for example, the distance between the incident surface and the exit surface of the first biconcave lens 134 is 0.50mm; as shown in the lens design parameters corresponding to the surface number 7, the distance between the incident surface and the exit surface of the second biconcave lens 135 is 4.11mm to 4.13mm, for example, the distance between the incident surface and the exit surface of the second biconcave lens 135 is 4.12mm.
With reference to table 1, as shown by the lens design parameters corresponding to the surface number 5, the distance between the incident surface and the exit surface of the fourth lenticular lens 151 is 1.77mm to 1.79mm, for example, the distance between the incident surface and the exit surface of the fourth lenticular lens 151 is 1.78mm; as shown in the lens design parameters corresponding to the surface number 3, the distance between the incident surface and the exit surface of the first negative crescent lens 152 is 0.49mm to 0.51mm, for example, the distance between the incident surface and the exit surface of the first negative crescent lens 152 is 0.50mm; as shown in the lens design parameters corresponding to the surface number 1, the distance between the incident surface and the exit surface of the second negative crescent lens 153 is 0.49mm to 0.51mm, and for example, the distance between the incident surface and the exit surface of the second negative crescent lens 153 is 0.50mm.
The focal length of the projection lens 100 is 7.6mm to 7.8mm, optionally 7.7mm, the throw ratio is 1.5, the relative aperture is 3.0, the field angle is larger than 42 degrees, the circumscribed circle diameter (namely the image space image field) of the imaging target surface is larger than 4mm, and the distortion is controlled to be smaller than 1%.
As an example, with reference to table 1, in an embodiment, as shown in the lens design parameters corresponding to the surface number 14, the half aperture of the first biconvex lens 131 is 4.49mm to 4.51mm, for example, the half aperture of the first biconvex lens 131 is 4.50mm; as shown by the lens design parameters corresponding to the surface number 12, the semi-aperture of the second biconvex lens 132 is 4.29mm to 4.31mm, for example, the semi-aperture of the second biconvex lens 132 is 4.30mm; as shown by the lens design parameters corresponding to the surface number 10, the half aperture of the third biconvex lens 133 is 3.39mm to 3.41mm, for example, the half aperture of the third biconvex lens 133 is 3.40mm; as shown in the lens design parameters corresponding to the surface number 9, the half aperture of the first double-concave lens 134 is 3.09mm to 3.11mm, for example, the half aperture of the first double-concave lens 134 is 3.10mm; as shown in the lens design parameters corresponding to the surface number 7, the semi-aperture of the second double concave lens 135 is 2.09mm to 2.11mm, for example, the semi-aperture of the second double concave lens 135 is 2.10mm.
As shown in the lens design parameters corresponding to the surface number 5, the half-diameter of the fourth biconvex lens 151 is 2.54mm to 2.56mm, for example, the half-diameter of the fourth biconvex lens 151 is 2.55mm; as shown by the lens design parameters corresponding to the surface number 3, the half aperture of the first negative crescent lens 152 is 2.47mm to 2.49mm, for example, the half aperture of the first negative crescent lens 152 is 2.48mm; as shown in the lens design parameters corresponding to the surface number 1, the half aperture of the second negative crescent lens 153 is 2.86mm to 2.88mm, for example, the half aperture of the second negative crescent lens 153 is 2.87mm.
In this way, the diameter of each lens does not exceed 9mm at the maximum, and thus the projection lens 100 can be applied to a pico projector.
As an example, in one embodiment, with reference to table 1, as shown in the lens design parameters corresponding to the surface number 14, the refractive index of the first biconvex lens 131 is 1.57 to 1.59, for example, the refractive index of the first biconvex lens 131 is 1.58; as shown by the lens design parameters corresponding to the surface number 12, the refractive index of the second biconvex lens 132 is 1.62 to 1.64, for example, the refractive index of the second biconvex lens 132 is 1.63; as shown by the lens design parameters corresponding to the surface number 10, the refractive index of the third lenticular lens 133 is 1.57 to 1.59, for example, the refractive index of the third lenticular lens 133 is 1.58; as shown by the lens design parameters corresponding to the surface number 9, the refractive index of the first biconcave lens 134 is 1.91-1.93, for example, the refractive index of the first biconcave lens 134 is 1.92; as shown in the lens design parameters corresponding to the surface number 7, the refractive index of the second biconcave lens 135 is 1.91 to 1.93, for example, the refractive index of the second biconcave lens 135 is 1.92.
As shown by the lens design parameters corresponding to the surface number 5, the refractive index of the fourth lenticular lens 151 is 1.77 to 1.79, for example, the refractive index of the fourth lenticular lens 151 is 1.78; as shown by the lens design parameters corresponding to the surface number 3, the refractive index of the first negative crescent lens 152 is 1.82 to 1.84, for example, the refractive index of the first negative crescent lens 152 is 1.83; as shown in the lens design parameters corresponding to the surface number 1, the refractive index of the second negative crescent lens 153 is 1.91 to 1.93, for example, the refractive index of the second negative crescent lens 153 is 1.92.
As an example, in one embodiment, with reference to table 1, as shown in the lens design parameters corresponding to the surface number 15, the radius of curvature of the incident surface of the first biconvex lens 131 is-21.37 mm; as shown by the lens design parameters corresponding to the surface number 14, the radius of curvature of the exit surface of the first biconvex lens 131 is 30.1mm; as shown by the lens design parameters corresponding to the surface number 13, the radius of curvature of the incident surface of the second biconvex lens 132 is-13.91 mm; as shown by the lens design parameters corresponding to the surface number 12, the curvature radius of the exit surface of the second biconvex lens 132 is 332.5mm; as shown by the lens design parameters corresponding to the surface number 11, the radius of curvature of the incident surface of the third biconvex lens 133 is-8.01 mm; as shown by the lens design parameters corresponding to the surface number 10, the radius of curvature of the exit surface of the third biconvex lens 133 is 19.61mm; as shown by the lens design parameters corresponding to the surface number 9, the radius of curvature of the exit surface of the first biconcave lens 134 is-24.76 mm; as shown by the lens design parameters corresponding to the surface number 8, the radius of curvature of the incident surface of the second biconcave lens 135 is 65.04mm; as shown by the lens design parameters corresponding to the surface number 7, the radius of curvature of the exit surface of the second biconcave lens 135 is-7.42 mm.
As shown by the lens design parameters corresponding to the surface number 6, the radius of curvature of the incident surface of the fourth biconvex lens 151 is-9.27 mm; as shown by the lens design parameters corresponding to the surface number 5, the radius of curvature of the exit surface of the fourth biconvex lens 151 is 11.11mm; as shown by the lens design parameters corresponding to the surface number 4, the radius of curvature of the incident surface of the first negative crescent lens 152 is 5.8mm; as shown by the lens design parameters corresponding to the surface number 3, the curvature radius of the exit surface of the first negative crescent lens 152 is 14.85mm; as shown by the lens design parameters corresponding to the surface number 2, the radius of curvature of the incident surface of the second negative crescent lens 153 is 4.48mm; as shown in the lens design parameters corresponding to the surface number 1, the radius of curvature of the exit surface of the second negative crescent lens 153 is 8.05mm.
As an example, in an embodiment, as shown in fig. 1-2, the reflecting mirror 160 can deflect relative to the optical axis of the front lens group 150, so that the inclined angle of the reflecting mirror 160 with respect to the optical axis of the front lens group 150 increases or decreases by 0 to 10 °.
In this way, as the inclined angle between the reflecting mirror 160 and the optical axis of the front lens group 150 increases or decreases by 0 to 10 °, the periscope angle of the projection lens 100 increases or decreases by 0 to 20 °.
The optical performance of the projection lens 100 is verified by a specific experiment.
Referring to fig. 3, fig. 3 is a relative illuminance curve of the projection lens of the present application, as shown in fig. 3, a relative illuminance curve a1 is used to reflect the brightness uniformity of the image, and it can be seen from fig. 3 that the image brightness of the projection lens 100 is uniform, and the image quality is good in terms of relative illuminance.
Referring to fig. 4, fig. 4 is a graph showing astigmatism of the projection lens of the present application, and it can be seen from fig. 4 that the degree of astigmatism of the projection lens 100 is relatively light, which reflects that the projection lens 100 has a relatively low optical distortion level to some extent.
Referring to fig. 5, fig. 5 is a distortion curve chart of the projection lens of the present application, and it can be seen from fig. 5 that the projection lens 100 has a relatively low maximum distortion rate and good optical performance.
The embodiment of the present application further provides a projector (not shown), which includes a housing (not shown) and a projection lens 100, wherein the projection lens 100 is disposed in the housing, and the projection lens 100 can be fixed by the housing.
The projector provided by the embodiment comprises a projection lens 100, can realize a projection ratio of 1.45. For detailed structural features of the projection lens 100, refer to the related description of the above embodiments. Since the projector includes the projection lens 100 in the above embodiments, all the advantages of the projection lens 100 are provided, and the details are not repeated herein.
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings are included in the scope of the present disclosure.
Claims (10)
1. A projection lens is characterized by comprising a rear lens group and a front lens group which are sequentially arranged along the incidence direction of projection light; an aperture diaphragm is arranged between the rear lens group and the front lens group;
the rear lens group comprises a first biconvex lens, a second biconvex lens, a third biconvex lens, a first biconcave lens and a second biconcave lens which are sequentially arranged along the incidence direction of the projection light;
the front lens group comprises a fourth biconvex lens, a first negative crescent lens and a second negative crescent lens which are sequentially arranged along the incident direction of the projection light;
wherein, the projection ratio of the projection lens is 1.45.
2. The projection lens of claim 1 wherein the optical axis of the rear lens group coincides with the optical axis of the front lens group;
on the optical axis of the rear lens group, a space is formed between the first biconvex lens and the second biconvex lens, a space is formed between the second biconvex lens and the third biconvex lens, the third biconvex lens and the first biconcave lens are glued into a whole structure, and a space is formed between the first biconcave lens and the second biconcave lens; a space is arranged between the second biconcave lens and the fourth biconvex lens;
on the optical axis of the rear lens group, a space is formed between the fourth biconvex lens and the first negative crescent lens, and a space is formed between the first negative crescent lens and the second negative crescent lens;
on the optical axis of the rear lens group, the mechanical total length of the projection lens is 22-23 mm, and the optical rear intercept of the projection lens except the projection lens is greater than or equal to 19.3mm.
3. The projection lens of claim 2,
on the optical axis of the rear lens group, the distance between the exit surface of the first biconvex lens and the entrance surface of the second biconvex lens is 0.09mm to 0.11mm, the distance between the exit surface of the second biconvex lens and the entrance surface of the third biconvex lens is 0.09mm to 0.11mm, and the distance between the exit surface of the first biconcave lens and the entrance surface of the second biconcave lens is 0.46mm to 0.48mm; the distance between the emergent surface of the second biconcave lens and the incident surface of the fourth biconvex lens is 3.43 mm-3.45 mm;
on the optical axis of the rear lens group, the distance between the exit surface of the fourth biconvex lens and the incident surface of the first negative crescent lens is 2.69 mm-2.71 mm, and the distance between the exit surface of the first negative crescent lens and the incident surface of the second negative crescent lens is 1.29 mm-1.31 mm.
4. The projection lens of claim 1,
the semi-aperture of the first biconvex lens is 4.49 mm-4.51 mm, the semi-aperture of the second biconvex lens is 4.29 mm-4.31 mm, the semi-aperture of the third biconvex lens is 3.39 mm-3.41 mm, the semi-aperture of the first biconcave lens is 3.09 mm-3.11 mm, and the semi-aperture of the second biconcave lens is 2.09 mm-2.11 mm;
the semi-aperture of the fourth biconvex lens is 2.54 mm-2.56 mm, the semi-aperture of the first negative crescent lens is 2.47 mm-2.49 mm, and the semi-aperture of the second negative crescent lens is 2.86 mm-2.88 mm.
5. The projection lens of claim 1,
the refractive index of the first biconvex lens is 1.57-1.59, the refractive index of the second biconvex lens is 1.62-1.64, the refractive index of the third biconvex lens is 1.57-1.59, the refractive index of the first biconcave lens is 1.91-1.93, and the refractive index of the second biconcave lens is 1.91-1.93;
the refractive index of the fourth biconvex lens is 1.77-1.79, the refractive index of the first negative crescent lens is 1.82-1.84, the refractive index of the second negative crescent lens is 1.91-1.93.
6. The projection lens according to claim 1, wherein the projection lens comprises a reflector, the front lens group and the reflector are sequentially arranged along the incident direction of the projection light, and the reflector is obliquely arranged relative to the incident direction of the projection light and is used for deflecting the projection light incident in the incident direction to the emergent direction;
wherein the mirror is deflectable relative to an optical axis of the front lens group.
7. The projection lens of claim 1,
on the optical axis of the rear lens group, the distance between the incident surface and the exit surface of the first biconvex lens is 2.02 mm-2.04 mm, the distance between the incident surface and the exit surface of the second biconvex lens is 1.92 mm-1.94 mm, the distance between the incident surface and the exit surface of the third biconvex lens is 2.47 mm-2.49 mm, the distance between the incident surface and the exit surface of the first biconcave lens is 0.49 mm-0.51 mm, and the distance between the incident surface and the exit surface of the second biconcave lens is 4.11 mm-4.13 mm;
the distance between the incident surface and the exit surface of the fourth biconvex lens is 1.77-1.79 mm, the distance between the incident surface and the exit surface of the first negative crescent lens is 0.49-0.51 mm, and the distance between the incident surface and the exit surface of the second negative crescent lens is 0.49-0.51 mm.
8. The projection lens of claim 2 wherein the total optical length of the projection lens on the optical axis of the rear lens group is less than or equal to 41.4mm.
9. The projection lens of claim 1 wherein the field angle of the projection lens is greater than 42 °.
10. A projector comprising a housing and a projection lens according to any one of claims 1 to 9, the projection lens being disposed in the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220766736.XU CN217543510U (en) | 2022-03-31 | 2022-03-31 | Projection lens and projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220766736.XU CN217543510U (en) | 2022-03-31 | 2022-03-31 | Projection lens and projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217543510U true CN217543510U (en) | 2022-10-04 |
Family
ID=83429985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220766736.XU Active CN217543510U (en) | 2022-03-31 | 2022-03-31 | Projection lens and projector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217543510U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114296219A (en) * | 2021-12-29 | 2022-04-08 | 歌尔股份有限公司 | Projection lens and projector |
-
2022
- 2022-03-31 CN CN202220766736.XU patent/CN217543510U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114296219A (en) * | 2021-12-29 | 2022-04-08 | 歌尔股份有限公司 | Projection lens and projector |
| CN114296219B (en) * | 2021-12-29 | 2023-09-12 | 歌尔光学科技有限公司 | Projection lens and projector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107422458B (en) | L-shaped short-focus full-high-definition projection lens with low F number | |
| CN101515060B (en) | Zoom lens and image pickup apparatus using the same | |
| CN111290100B (en) | Projection lens and projection imaging system | |
| WO2023134651A1 (en) | Camera module and electronic device | |
| CN114047613B (en) | Optical system and projection device | |
| CN217543510U (en) | Projection lens and projector | |
| CN213987009U (en) | Internal reflection type telecentric lens | |
| CN219370111U (en) | Optical imaging system, camera module and electronic equipment | |
| CN112505897A (en) | Optical imaging system, image capturing module and electronic device | |
| CN115793361A (en) | Ultra-short-focus projection lens and system | |
| CN114137783A (en) | Projection lens and projector | |
| CN115047591B (en) | Projection lens and projection device | |
| CN105759405B (en) | Optical system capable of increasing field angle and projection lens | |
| EP4283369A1 (en) | Telephoto lens, camera module, and electronic device | |
| US20220221698A1 (en) | Optical system and projection device | |
| CN215340674U (en) | Ultra-short focus projection optical system | |
| CN110873955A (en) | Ultra-short-focus lens for projector | |
| WO2022088651A1 (en) | Periscopic optical imaging system, camera module, and electronic device | |
| US11513317B2 (en) | Lens device under cover glass and lens assembly | |
| CN114488477A (en) | Optical system, lens module and electronic equipment | |
| CN105785553B (en) | Small short-focus projection lens | |
| CN111522128A (en) | Wide-angle lens and panoramic camera system | |
| CN113917656A (en) | Optical lens, camera module and electronic equipment | |
| CN112162385A (en) | Optical imaging system, image capturing module and electronic device | |
| CN113176651B (en) | High-definition conference lens and image pickup device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |