CN216870953U - Optical system based on Fresnel lens - Google Patents
Optical system based on Fresnel lens Download PDFInfo
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- CN216870953U CN216870953U CN202220774654.XU CN202220774654U CN216870953U CN 216870953 U CN216870953 U CN 216870953U CN 202220774654 U CN202220774654 U CN 202220774654U CN 216870953 U CN216870953 U CN 216870953U
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Abstract
The utility model provides an optical system based on a Fresnel lens, which belongs to the technical field of optical imaging and comprises a display, a first optical lens, a second optical lens and a Fresnel lens, wherein the first optical lens is arranged on a light emergent light path of the display, the second optical lens is arranged on a transmission light path of the first optical lens, the Fresnel lens is arranged on a reflection light path of the second optical lens, the focal length of the Fresnel lens is f, f is less than 500mm, an included angle formed by the second optical lens and the display is alpha, and alpha is more than or equal to 30 degrees and less than or equal to 60 degrees. The novel optical fiber laser imaging device is compact in structure, small in size, light in weight, good in imaging quality and large in field angle range, stray light is eliminated, and user experience is greatly improved.
Description
Technical Field
The utility model belongs to the technical field of optical imaging, and particularly relates to an optical system based on a Fresnel lens.
Background
Augmented Reality (AR) is a display technology, which is capable of combining virtual information with the real world to bring a brand new use feeling to a user by magnifying image information in a terminal device and presenting the magnified image information to the user through a transmissive optical display system. Currently, the enhanced display device is widely applied to the fields of film watching, games, education, industry, medical treatment and the like. With the popularization of the concept of 'Yuanuniverse', the development of augmented reality, virtual reality and mixed reality technologies is further promoted, the application of various products is wider, and the corresponding technologies and the product performance are further improved. However, the current products still have the problems of light leakage, heavy weight, large volume and the like.
SUMMERY OF THE UTILITY MODEL
The optical system based on the Fresnel lens is small in size, light in weight, good in imaging quality, large in field angle range, free of display light leakage and capable of greatly improving user experience.
The embodiment of the utility model is realized by the following steps:
the embodiment of the utility model provides an optical system based on a Fresnel lens, which comprises a display, a first optical lens, a second optical lens and a Fresnel lens, wherein the first optical lens is arranged on a light emergent light path of the display, the second optical lens is arranged on a transmission light path of the first optical lens, the Fresnel lens is arranged on a reflection light path of the second optical lens, an included angle formed by the second optical lens and the display is alpha, and alpha is more than or equal to 30 degrees and less than or equal to 60 degrees.
Optionally, the first optical lens includes a first lens and a circular polarizer, and the circular polarizer is disposed on one side of the first lens.
Optionally, the second optical lens includes a second optical substrate, a second absorption-type polarizing film, a second polarizing reflective film, a second quarter-wave plate layer, and a second antireflection film; the second absorption-type polarizing film is disposed on a side of the second optical substrate close to the first optical lens, the second polarization reflection film is disposed on a side of the second absorption-type polarizing film away from the second optical substrate, the second quarter-wave plate layer is disposed on a side of the second polarization reflection film away from the second optical substrate, and the second antireflection film is disposed on both a side of the second quarter-wave plate layer away from the second optical substrate and a side of the second optical substrate away from the second absorption-type polarizing film.
Optionally, the fresnel lens includes a fresnel substrate, a semi-transparent and semi-reflective film, and a third anti-reflection film; the semi-transparent and semi-reflective film is arranged on one side of the Fresnel substrate, and the third anti-reflection film is arranged on the other side of the Fresnel substrate.
Optionally, the first optical lens is a transmission mirror.
Optionally, the second optical lens includes a second optical substrate, a second absorption-type polarizing film, a second polarizing reflective film, and a second antireflection film; the second absorption-type polarizing film is arranged on one side of the second optical substrate close to the first optical lens, the second polarization reflection film is arranged on one side of the second absorption-type polarizing film far away from the second optical substrate, and the second antireflection film is arranged on one side of the second polarization reflection film far away from the second optical substrate and one side of the second optical substrate far away from the second absorption-type polarizing film.
Optionally, the fresnel lens includes a fresnel substrate, a semi-transparent and semi-reflective film, a third quarter-wave plate layer, and a third anti-reflection film; the Fresnel surface of the Fresnel substrate deviates from the second optical lens, the semi-transparent and semi-reflective film is arranged on one side, close to the second optical lens, of the Fresnel substrate, the third quarter-wave sheet layer is arranged on one side, far away from the Fresnel substrate, of the semi-transparent and semi-reflective film, and the third antireflection film is arranged on one side, far away from the semi-transparent and semi-reflective film, of the third quarter-wave sheet layer and on one side, far away from the Fresnel surface, of the Fresnel substrate.
Optionally, the fresnel lens includes a fresnel substrate, a semi-transparent semi-reflective film, a filling layer, a third quarter-wave plate layer, and a third anti-reflective film; the Fresnel surface of the Fresnel substrate faces the second optical lens, the semi-transparent and semi-reflective film is arranged on one side, close to the second optical lens, of the Fresnel substrate, the filling layer is arranged on one side, away from the Fresnel substrate, of the semi-transparent and semi-reflective film, the third quarter-wave plate layer is arranged on one side, away from the Fresnel substrate, of the filling layer, and the third antireflection film is arranged on one side, away from the filling layer, of the third quarter-wave plate layer and on one side, away from the semi-transparent and semi-reflective film, of the Fresnel substrate.
Optionally, the Fresnel substrate has a rise of r, where 0 < r < 25 mm.
Optionally, one side of the fresnel surface of the fresnel substrate is provided with a plurality of circles of annular grooves, the other side surface is a plane or a curved surface, the sections of the annular grooves are V-shaped, the groove depth of the annular grooves is h, h is less than 0.5mm, the groove width of the annular grooves is w, and w is less than 0.5 mm.
Optionally, two side surfaces of the annular groove are respectively a working surface and a non-working surface, wherein an included angle formed between the non-working surface and the optical axis of the fresnel substrate is theta, and theta is greater than or equal to 0 degree and less than or equal to 30 degrees.
In each optical lens, the antireflection film is used for improving the transmittance of the optical lens and reducing the influence caused by stray light; the polarizing film is used for absorbing linearly polarized light in one direction and transmitting linearly polarized light in the other direction; the polarization reflection film has the functions of reflecting linearly polarized light in one direction and transmitting linearly polarized light in the other direction; the quarter-wave plate layer changes the polarization state of light.
The utility model has the beneficial effects that:
the Fresnel lens-based optical system provided by the embodiment of the utility model has the advantages of compact structure, small volume, light weight, good imaging quality, wide field angle range, no display light leakage, better privacy protection, elimination of stray light and great improvement of user experience.
Drawings
Fig. 1 is a schematic view of an optical architecture of an optical system based on a fresnel lens according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second optical lens according to the first embodiment;
fig. 3 is another schematic structural diagram of a second optical lens according to the first embodiment;
FIG. 4 is a schematic view of another structure of a second optical lens according to the first embodiment;
FIG. 5 is a schematic view of another structure of a second optical lens according to the first embodiment;
fig. 6 is a schematic structural diagram of a fresnel lens according to a first embodiment;
FIG. 7 is a schematic view of a Fresnel substrate structure;
fig. 8 is a schematic view of an optical architecture of a fresnel lens-based optical system according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of a second optical lens according to a second embodiment;
fig. 10 is another schematic structural diagram of a second optical lens according to the second embodiment;
fig. 11 is a schematic structural diagram of a second optical lens according to a second embodiment;
fig. 12 is a schematic structural view of a fresnel lens according to a second embodiment;
fig. 13 is a schematic view of an optical architecture of a fresnel-lens-based optical system according to a third embodiment of the present invention;
fig. 14 is a schematic structural view of a fresnel lens according to a third embodiment;
in the figure: 10-a first optical lens; 101-a first lens; 102-circular polarizer; 20-a second optical lens; 201-a second optical substrate; 202-a second absorptive polarizing film; 203-a second polarizing reflective film; 204-a second quarter-wave plate layer; 205-a second antireflective film; 30-a fresnel lens; 301-a fresnel substrate; 302-a third antireflective film; 303-a semi-transparent and semi-reflective film; 304-a third quarter-wave plate layer; 305-a filler layer; 40-display.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a fresnel lens-based optical system, which includes a display 40, a first optical lens 10, a second optical lens 20, and a fresnel lens 30.
The display 40 mainly functions to emit light, the display 40 may display 2D or 3D images or video, and the display 40 may employ an OLED display, an LCD display, an LCOS display, a micro-LED display, a mini-LED display, a DLP display, or the like.
The first optical lens 10 is disposed on a light-emitting path of the display 40, and light emitted from the display 40 is processed by the first optical lens 10 and then transmitted to form transmitted light.
The first optical lens 10 includes a first lens 101 and a circular polarizer 102, and the circular polarizer 102 is disposed on a side of the first lens 101 close to the display 40, but in another embodiment, the circular polarizer 102 may also be disposed on a side of the first lens 101 away from the display 40.
Both side surfaces of the first lens 101 may be processed into a spherical surface, an aspherical surface, a free-form surface, or the like.
The second optical lens 20 is disposed on the transmission light path of the first optical lens 10, and the transmission light transmitted from the first optical lens 10 enters the second optical lens 20 and is reflected to form a reflection light.
An acute angle formed by the plane of the second optical lens 20 and the plane of the display 40 is alpha, and the alpha is more than or equal to 30 degrees and less than or equal to 60 degrees. In the present embodiment, α is 45 °. Of course, α may also be set to 30 °, 40 °, 50 °, 60 °, etc.
The second optical lens 20 includes a second optical substrate 201, a second absorption-type polarizing film 202, a second polarizing reflective film 203, a second quarter-wave plate layer 204, and a second antireflection film 205.
Both side surfaces of the second optical substrate 201 may be processed into a plane shape, a spherical surface, an aspherical surface, a free-form surface, or the like.
In this embodiment, referring to fig. 2, the second absorption type polarization film 202 is disposed on the side of the second optical substrate 201 close to the first optical lens 10, the second polarization reflection film 203 is disposed on the side of the second absorption type polarization film 202 far from the second optical substrate 201, the second quarter-wave plate layer 204 is disposed on the side of the second polarization reflection film 203 far from the second optical substrate 201, and the second antireflection film 205 is disposed on both the side of the second quarter-wave plate layer 204 far from the second optical substrate 201 and the side of the second optical substrate 201 far from the second absorption type polarization film 202.
Of course, in another embodiment, referring to fig. 3, the second absorption-type polarization film 202 is disposed on the side of the second optical substrate 201 away from the first optical lens 10, the second polarization reflection film 203 is disposed on the side of the second optical substrate 201 away from the second absorption-type polarization film 202, the second quarter-wave plate layer 204 is disposed on the side of the second polarization reflection film 203 away from the second optical substrate 201, and the second antireflection film 205 is disposed on both the side of the second quarter-wave plate layer 204 away from the second optical substrate 201 and the side of the second absorption-type polarization film 202 away from the second optical substrate 201.
In still another embodiment, referring to fig. 4, the second polarizing reflective film 203 is disposed on a side of the second optical substrate 201 away from the first optical lens 10, the second absorbing polarizing film 202 is disposed on a side of the second polarizing reflective film 203 away from the second optical substrate 201, the second quarter-wave plate layer 204 is disposed on a side of the second optical substrate 201 away from the second polarizing reflective film 203, and the second antireflection film 205 is disposed on both a side of the second quarter-wave plate layer 204 away from the second optical substrate 201 and a side of the second absorbing polarizing film 202 away from the second optical substrate 201.
In still another embodiment, referring to fig. 5, a second quarter-wave plate layer 204 is disposed on a side of the second optical substrate 201 away from the first optical lens 10, a second polarization reflection film 203 is disposed on a side of the second quarter-wave plate layer 204 away from the second optical substrate 201, a second absorption polarization film 202 is disposed on a side of the second polarization reflection film 203 away from the second optical substrate 201, and a second antireflection film 205 is disposed on both a side of the second absorption polarization film 202 away from the second optical substrate 201 and a side of the second optical substrate 201 away from the second quarter-wave plate layer 204.
The fresnel lens 30 is disposed on the reflected light path of the second optical lens 20.
Referring to fig. 6, the fresnel lens 30 includes a fresnel substrate 301, a semi-transparent and semi-reflective film 303 and a third antireflection film 302, the semi-transparent and semi-reflective film 303 is disposed on one side of the fresnel substrate 301 close to the second optical lens 20, and the third antireflection film 302 is disposed on the other side of the fresnel substrate 301.
In this embodiment, the fresnel surface of the fresnel substrate 301 may be away from the second optical lens 20, or may be towards the second optical lens 20.
The Fresnel lens 30 has a focal length f < 500 mm. In this example, f is 400 mm.
Referring to FIG. 7, the Fresnel substrate 301 has a rise of r, 0 < r < 25mm, where r is 20mm in this embodiment.
The fresnel substrate 301 has a plurality of circles of annular grooves on one fresnel surface side, the other side surface is a plane or a curved surface, the section of the annular groove is V-shaped, the groove depth of the annular groove is h, h is less than 0.5mm, and in the embodiment, h is 0.3 mm.
Two side surfaces in the V-shaped annular groove are respectively a working surface and a non-working surface, wherein an included angle formed between the non-working surface and an optical axis of the Fresnel substrate is theta, theta is more than or equal to 0 degree and less than or equal to 30 degrees, and in the embodiment, theta is 0.5 degrees.
The imaging principle of the optical system based on the fresnel lens of the present embodiment is as follows:
light emitted by the display 40 firstly enters the first optical lens 10, the light is changed into circularly polarized light after being processed by the first optical lens 10 and is transmitted out, the circularly polarized light transmitted out from the first optical lens 10 enters the second optical lens 20, the circularly polarized light is totally reflected on the second optical lens 20, the light totally reflected from the second optical lens 20 enters the Fresnel lens 30, part of the light is reflected and then enters the second optical lens 20, part of the light is transmitted out from the Fresnel lens 30, the phase of the light reflected by the Fresnel lens 30 is changed, and the light is changed into linearly polarized light after being processed by the second optical lens 20 and is transmitted out to reach human eyes to form a virtual image with a specific imaging position and a specific magnification.
Example 2
Referring to fig. 8, a second embodiment of the present invention provides a fresnel-lens-based optical system, which includes a display 40, a first optical lens 10, a second optical lens 20, and a fresnel lens 30.
The display 40 mainly functions to emit light, the display 40 may display 2D or 3D images or video, and the display 40 may employ an OLED display, an LCD display, an LCOS display, a micro-LED display, a mini-LED display, a DLP display, or the like.
The first optical lens 10 is disposed on a light-emitting path of the display 40, and light emitted from the display 40 is processed by the first optical lens 10 and then transmitted to form transmitted light.
In this embodiment, the first optical lens 10 is a transmission lens.
The second optical lens 20 is disposed on a transmission light path of the first optical lens 10, and the transmission light transmitted from the first optical lens 10 enters the second optical lens 20 and is reflected to form a reflection light.
An acute angle formed by the plane of the second optical lens 20 and the plane of the display 40 is alpha, and the alpha is more than or equal to 30 degrees and less than or equal to 60 degrees. In the present embodiment, α is 40 °. Of course, α may also be set to 30 °, 45 °, 50 °, 60 °, etc.
The second optical lens 20 includes a second optical substrate 201, a second absorption-type polarizing film 202, a second polarizing reflection film 203, and a second antireflection film 205.
Both side surfaces of the second optical substrate 201 may be processed into a plane shape, a spherical surface, an aspherical surface, a free-form surface, or the like.
In this embodiment, referring to fig. 9, the second absorption polarization film 202 is disposed on the side of the second optical substrate 201 close to the first optical lens 10, the second polarization reflection film 203 is disposed on the side of the second absorption polarization film 202 away from the second optical substrate 201, and the second antireflection film 205 is disposed on both the side of the second polarization reflection film 203 away from the second optical substrate 201 and the side of the second optical substrate 201 away from the second absorption polarization film 202.
Of course, in another embodiment, referring to fig. 10, the second absorption-type polarization film 202 is disposed on the side of the second optical substrate 201 away from the first optical lens 10, the second polarization reflection film 203 is disposed on the side of the second optical substrate 201 away from the second absorption-type polarization film 202, and the second antireflection film 205 is disposed on both the side of the second polarization reflection film 203 away from the second optical substrate 201 and the side of the second absorption-type polarization film 202 away from the second optical substrate 201.
In still another embodiment, referring to fig. 11, a second polarizing reflective film 203 is disposed on a side of the second optical substrate 201 away from the first optical lens 10, a second absorbing polarizing film 202 is disposed on a side of the second polarizing reflective film 203 away from the second optical substrate 201, and a second antireflection film 205 is disposed on both the side of the second optical substrate 201 away from the second polarizing reflective film 203 and the side of the second absorbing polarizing film 202 away from the second optical substrate 201.
The fresnel lens 30 is disposed on the reflected light path of the second optical lens 20.
In this embodiment, referring to fig. 12, the fresnel lens 30 includes a fresnel substrate 301, a semi-transparent and semi-reflective film 303, a third quarter-wave plate layer 304, and a third antireflection film 302.
The fresnel surface of the fresnel substrate 301 deviates from the second optical lens 20, the semi-transparent and semi-reflective film 303 is disposed on one side of the fresnel substrate 301 close to the second optical lens 20, the third quarter-wave plate layer 304 is disposed on one side of the semi-transparent and semi-reflective film 303 far away from the fresnel substrate 301, and the third antireflection film 302 is disposed on both one side of the third quarter-wave plate layer 304 far away from the semi-transparent and semi-reflective film 303 and one side of the fresnel surface of the fresnel substrate 301.
It should be noted that the focal length of the fresnel lens 30 is f, and f < 500 mm. In this example, f is 300 mm.
Referring to FIG. 7, the Fresnel substrate 301 has a rise of r, 0 < r < 25mm, in this embodiment, 15 mm.
The fresnel surface of the fresnel substrate 301 has a plurality of circles of annular grooves on one side, and the other side surface is a plane or curved surface, the section of the annular groove is V-shaped, the width of the annular groove is w, w is less than 0.5mm, and in this embodiment, w is 0.3 mm.
Two side surfaces in the V-shaped annular groove are a working surface and a non-working surface respectively, wherein an included angle formed between the non-working surface and an optical axis of the fresnel substrate is θ, θ is greater than or equal to 0 ° and less than or equal to 30 °, and in this embodiment, θ is greater than or equal to 5 °.
The imaging principle of the optical system based on the fresnel lens of the present embodiment is as follows:
the light that the display 40 sent gets into first optical lens 10 at first, the light becomes circular polarized light transmission after handling through first optical lens 10, the light that transmits out from first optical lens 10 gets into second optical lens 20, light is by the total reflection on second optical lens 20, the light that totally reflects from second optical lens 20 gets into fresnel lens 30 after the part gets into second optical lens 20 again after being reflected, partly go out from fresnel lens 30 transmission, the light phase place that is reflected by fresnel lens 30 changes, then become the linear polarized light transmission after handling through second optical lens 20 and go out and reach the virtual image of specific imaging position and specific magnification.
Example 3
Referring to fig. 13, a second embodiment of the present invention provides a fresnel-lens-based optical system, which includes a display 40, a first optical lens 10, a second optical lens 20, and a fresnel lens 30.
The difference between this embodiment and the second embodiment is the fresnel lens 30.
The display 40, the first optical lens 10, and the second optical lens 20 in this embodiment adopt the display 40, the first optical lens 10, and the second optical lens 20 in the second embodiment, and the structure, the working principle, and the generated technical effects thereof refer to the corresponding contents in the second embodiment, which are not described herein again.
In this embodiment, referring to fig. 14, the fresnel lens 30 includes a fresnel substrate 301, a semi-transparent and semi-reflective film 303, a filling layer 305, a third quarter-wave plate layer 304, and a third antireflection film 302.
The fresnel surface of the fresnel substrate 301 faces the second optical lens 20, the semi-transmissive and semi-reflective film 303 is disposed on one side of the fresnel substrate 301 close to the second optical lens 20, the filling layer 305 is disposed on one side of the semi-transmissive and semi-reflective film 303 far away from the fresnel substrate 301, the third quarter-wave plate layer 304 is disposed on one side of the filling layer 305 far away from the fresnel substrate 301, and the third antireflection film 302 is disposed on one side of the third quarter-wave plate layer 304 far away from the filling layer 305 and one side of the fresnel substrate 301 far away from the semi-transmissive and semi-reflective film 303.
In this embodiment, the filling layer 305 fills the fresnel surface of the fresnel substrate 301 into a planar surface type.
It should be noted that the focal length of the fresnel lens 30 is f, and f < 500 mm. In this example, f is 200 mm.
Referring to FIG. 7, the Fresnel substrate 301 has a rise of r, 0 < r < 25mm, where r is 10mm in this embodiment.
The fresnel substrate 301 has a plurality of circles of annular grooves on one fresnel surface side, the other side surface is a plane or a curved surface, the section of the annular groove is V-shaped, the groove depth of the annular groove is h, h is less than 0.5mm, and in the embodiment, h is 0.2 mm.
Two side surfaces in the V-shaped annular groove are respectively a working surface and a non-working surface, wherein an included angle formed between the non-working surface and an optical axis of the Fresnel substrate is theta, theta is more than or equal to 0 degree and less than or equal to 30 degrees, and in the embodiment, theta is 15 degrees.
The imaging principle of the optical system based on the fresnel lens of the present embodiment is as follows:
the light that the display 40 sent gets into first optical lens 10 at first, the light becomes circular polarized light transmission after handling through first optical lens 10, the light that transmits out from first optical lens 10 gets into second optical lens 20, light is by the total reflection on second optical lens 20, the light that totally reflects from second optical lens 20 gets into fresnel lens 30 after the part gets into second optical lens 20 again after being reflected, partly go out from fresnel lens 30 transmission, the light phase place that is reflected by fresnel lens 30 changes, then become the linear polarized light transmission after handling through second optical lens 20 and go out and reach the virtual image of specific imaging position and specific magnification.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the utility model, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (11)
1. An optical system based on a Fresnel lens is characterized in that: including display, first optical lens, second optical lens and fresnel lens, first optical lens set up in the light-emitting light path of display, second optical lens set up in the transmission light path of first optical lens, fresnel lens set up in the reverberation light path of second optical lens, fresnel lens's focus is f, and f < 500mm, second optical lens with the contained angle that the display formed is alpha, and 30 is less than or equal to alpha and is less than or equal to 60.
2. A fresnel lens-based optical system according to claim 1, wherein: the first optical lens comprises a first lens and a circular polarizer, and the circular polarizer is arranged on one side of the first lens.
3. A fresnel lens-based optical system according to claim 2, wherein: the second optical lens comprises a second optical substrate, a second absorption type polarization film, a second polarization reflection film, a second quarter-wave plate layer and a second antireflection film; the second absorption-type polarizing film is disposed on a side of the second optical substrate close to the first optical lens, the second polarization reflection film is disposed on a side of the second absorption-type polarizing film away from the second optical substrate, the second quarter-wave plate layer is disposed on a side of the second polarization reflection film away from the second optical substrate, and the second antireflection film is disposed on both a side of the second quarter-wave plate layer away from the second optical substrate and a side of the second optical substrate away from the second absorption-type polarizing film.
4. A fresnel lens-based optical system according to claim 2, wherein: the Fresnel lens comprises a Fresnel substrate, a semi-transparent and semi-reflective film and a third anti-reflection film; the semi-transparent and semi-reflective film is arranged on one side of the Fresnel substrate, and the third anti-reflection film is arranged on the other side of the Fresnel substrate.
5. A fresnel lens-based optical system according to claim 1, wherein: the first optical lens is a transmission lens.
6. A Fresnel lens based optical system according to claim 5, characterized in that: the second optical lens comprises a second optical substrate, a second absorption type polarization film, a second polarization reflection film and a second antireflection film; the second absorption-type polarizing film is arranged on one side, close to the first optical lens, of the second optical substrate, the second polarization reflecting film is arranged on one side, far away from the second optical substrate, of the second absorption-type polarizing film, and the second antireflection film is arranged on one side, far away from the second optical substrate, of the second polarization reflecting film and one side, far away from the second absorption-type polarizing film, of the second optical substrate.
7. A Fresnel lens based optical system according to claim 5, characterized in that: the Fresnel lens comprises a Fresnel substrate, a semi-transparent and semi-reflective film, a third quarter-wave plate layer and a third anti-reflection film; the Fresnel surface of the Fresnel substrate deviates from the second optical lens, the semi-transparent and semi-reflective film is arranged on one side, close to the second optical lens, of the Fresnel substrate, the third quarter-wave sheet layer is arranged on one side, far away from the Fresnel substrate, of the semi-transparent and semi-reflective film, and the third antireflection film is arranged on one side, far away from the semi-transparent and semi-reflective film, of the third quarter-wave sheet layer and on one side, far away from the Fresnel surface, of the Fresnel substrate.
8. A Fresnel lens based optical system according to claim 5 wherein: the Fresnel lens comprises a Fresnel substrate, a semi-transparent semi-reflective film, a filling layer, a third quarter-wave plate layer and a third anti-reflection film; the Fresnel surface of the Fresnel substrate faces the second optical lens, the semi-transparent and semi-reflective film is arranged on one side, close to the second optical lens, of the Fresnel substrate, the filling layer is arranged on one side, away from the Fresnel substrate, of the semi-transparent and semi-reflective film, the third quarter-wave plate layer is arranged on one side, away from the Fresnel substrate, of the filling layer, and the third antireflection film is arranged on one side, away from the filling layer, of the third quarter-wave plate layer and on one side, away from the semi-transparent and semi-reflective film, of the Fresnel substrate.
9. A Fresnel lens based optical system according to claim 4, 7 or 8, characterized in that: the rise of the Fresnel substrate is r, and r is more than 0 and less than 25 mm.
10. A fresnel lens-based optical system according to claim 9, wherein: the Fresnel surface side of the Fresnel substrate is provided with a plurality of circles of annular grooves, the other side surface of the Fresnel surface side is a plane or a curved surface, the sections of the annular grooves are V-shaped, the groove depth of the annular grooves is h, h is less than 0.5mm, the groove width of the annular grooves is w, and w is less than 0.5 mm.
11. A fresnel lens-based optical system according to claim 10, wherein: two side surfaces of the annular groove are respectively a working surface and a non-working surface, wherein an included angle formed between the non-working surface and an optical axis of the Fresnel substrate is theta, and theta is more than or equal to 0 degree and less than or equal to 30 degrees.
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| CN202220774654.XU CN216870953U (en) | 2022-04-02 | 2022-04-02 | Optical system based on Fresnel lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114690427A (en) * | 2022-04-02 | 2022-07-01 | 江苏鸿蚁光电科技有限公司 | Optical display system based on Fresnel lens |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114690427A (en) * | 2022-04-02 | 2022-07-01 | 江苏鸿蚁光电科技有限公司 | Optical display system based on Fresnel lens |
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