CN113885166B

CN113885166B - Projector optical lens

Info

Publication number: CN113885166B
Application number: CN202110997252.6A
Authority: CN
Inventors: 骆海华
Original assignee: Wuhu Ruishida Optical Technology Co ltd
Current assignee: Wuhu Ruishida Optical Technology Co ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2024-04-05
Anticipated expiration: 2041-08-27
Also published as: CN113885166A

Abstract

One or more embodiments of the present disclosure provide an optical lens for a projector, including a first lens, a first spacer ring disposed behind the first lens, a second lens disposed behind the first spacer ring, a second spacer ring disposed behind the second lens, a third lens disposed behind the second spacer ring, a third spacer ring disposed behind the third lens, a fourth lens disposed behind the third spacer ring, an optical filter disposed behind the fourth lens, and an image side disposed behind the optical filter, wherein the first lens and the second lens are glass lenses, and the third lens and the fourth lens are plastic lenses.

Description

Projector optical lens

Technical Field

One or more embodiments of the present disclosure relate to the field of optics, and in particular, to an optical lens of a projector.

Background

With the progress of science and technology, the living standard is improved, the application of 5G technology is more and more extensive, the requirements of people on cameras are not only limited to common shooting effects, but also have wider fields of view, and the optical lens has the advantages of clear imaging quality, stronger identification degree, high and low temperature resistance, water resistance and the like, and is little influenced by the outside; in the actual design, the imaging effect of the lens is ensured, meanwhile, the lens has good processing capability, the production cost is reduced, and the lens is suitable for mass production and the like and becomes the requirement that the lens optical component design needs to meet;

most of lenses used in the projectors at present adopt glass lens designs, so that customers are difficult to accept the lenses in cost, and meanwhile, the weight of the lenses is heavy, so that the lenses are inconvenient to use.

Disclosure of Invention

Accordingly, it is an object of one or more embodiments of the present disclosure to provide an optical lens for a projector, which solves one or all of the above problems.

In view of the above, one or more embodiments of the present disclosure provide an optical lens for a projector, which includes a first lens, a first spacer ring disposed behind the first lens, a second lens disposed behind the first spacer ring, a second spacer ring disposed behind the second lens, a third lens disposed behind the second spacer ring, a third spacer ring disposed behind the third lens, a fourth lens disposed behind the third spacer ring, a filter disposed behind the fourth lens, and an image side disposed behind the filter, wherein the first lens and the second lens are glass lenses, and the third lens and the fourth lens are plastic lenses.

Optionally, the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the phase side surface of the first lens is a concave surface;

the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the phase side surface of the second lens is a concave surface;

the third lens has negative focal power, the object side surface of the third lens is a concave surface, and the phase side surface of the third lens is a convex surface;

the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the phase side surface of the fourth lens is a convex surface;

the first lens, the second lens, the third lens and the fourth lens are combined to form a lens with a diagonal angle of view of 36 degrees, a horizontal angle of view of 25 degrees, an effective focal length of 139mm and an optical back focal length of 130.7 mm.

Optionally, the refractive index of d light of the first lens is not less than 1.806010, and the abbe constant of d light of the first lens is not less than 40.95;

the second lens has a d-ray refractive index of not less than 1.72825 and a d-ray Abbe constant of not less than 28.32;

the third lens has a d-ray refractive index of not less than 1.639729 and a d-ray Abbe constant of not less than 23.528798;

the fourth lens has a d-ray refractive index of not less than 1.535037 and a d-ray Abbe constant of not less than 55.710700.

Optionally, the first spacer ring makes the distance between the first lens and the second lens be 11.06mm;

the second spacer ring makes the distance between the second lens and the third lens 18.6mm;

the third spacer ring makes the distance between the third lens and the fourth lens be 12.02mm.

Optionally, the object side surface of the first lens is plated with an antireflection multilayer antireflection film.

From the above, it can be seen that, by adopting the design of combining glass and plastic lenses, the optical lens of the projector according to one or more embodiments of the present disclosure not only saves cost, but also reduces the weight of the lens and improves the use experience of users.

Drawings

For a clearer description of one or more embodiments of the present description or of the solutions of the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only one or more embodiments of the present description, from which other drawings can be obtained, without inventive effort, for a person skilled in the art.

FIG. 1 is a schematic diagram of a projector optical lens according to one or more embodiments of the present disclosure;

FIG. 2 is a schematic view of light passing through a lens according to one or more embodiments of the present disclosure;

FIG. 3 is a schematic diagram of an optical lens assembly of a projector according to one or more embodiments of the present disclosure;

wherein, the first lens 1, the first spacing ring 2, the second lens 3, the second spacing ring 4, the third lens 5, the third spacing ring 6, the fourth lens 7, the optical filter 8 and the image space 9.

Detailed Description

For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made in detail to the following specific examples.

It is noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

One or more embodiments of the present disclosure provide an optical lens of a projector, as shown in fig. 1, including a first lens 1, a first spacer ring 2 located behind the first lens 1, a second lens 3 located behind the first spacer ring 2, a second spacer ring 4 located behind the second lens 3, a third lens 5 located behind the second spacer ring 4, a third spacer ring 6 located behind the third lens 5, a fourth lens 7 located behind the third spacer ring 6, a filter 8 located behind the fourth lens 7, and an image space 9 located behind the filter 8, wherein the first lens 1 and the second lens 3 are glass lenses, and the third lens 5 and the fourth lens 7 are plastic lenses.

The lens has the advantages that through the design of combining the glass lens and the plastic lens, the optical imaging stability of the lens is ensured, the cost is saved, the weight of the lens is reduced, and the use experience of a user is improved.

In some embodiments, the first lens 1 has negative optical power, the object side surface of which is convex, and the phase side surface of which is concave;

the second lens 3 has negative focal power, the object side surface is a convex surface, and the phase side surface is a concave surface;

the third lens 5 has negative focal power, the object side surface is a concave surface, and the phase side surface is a convex surface;

the fourth lens 7 has positive focal power, the object side surface is a convex surface, and the phase side surface is a convex surface;

the first lens 1, the second lens 3, the third lens 5 and the fourth lens 7 are combined to form a lens with a diagonal angle of view of 36 degrees, a horizontal angle of view of 25 degrees, an effective focal length of 139mm and an optical back focal length of 130.7 mm.

In some embodiments, the first lens 1 has a d-ray refractive index of not less than 1.806010 and a d-ray abbe constant of not less than 40.95;

the refractive index of the d light of the second lens 1 is not less than 1.72825, and the abbe constant of the d light is not less than 28.32;

the refractive index of d light of the third lens 1 is not less than 1.639729, and the abbe constant of d light is not less than 23.528798;

the refractive index of d light of the fourth lens 1 is not less than 1.535037, and the abbe constant of d light is not less than 55.710700.

In some embodiments, as shown in fig. 2 and 3, the first spacer ring 2 makes the distance between the first lens 1 and the second lens 3 be 11.06mm; the second spacer ring 4 makes the distance between the second lens 3 and the third lens 5 18.6mm; the third spacer ring 6 makes the distance between the third lens 5 and the fourth lens 7 be 12.02mm, and the total length of the optical path distance chip is 184.09mm after the third spacer ring is assembled with the lens barrel.

In some embodiments, the object side surface of the first lens 1 is coated with an antireflection multilayer antireflection film, so as to open up a field of view and enhance luminous flux.

Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; combinations of features of the above embodiments or in different embodiments are also possible within the spirit of the present disclosure, steps may be implemented in any order, and there are many other variations of the different aspects of one or more embodiments described above which are not provided in detail for the sake of brevity.

The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the disclosure, are therefore intended to be included within the scope of the disclosure.

Claims

1. The utility model provides a projector optical lens which is characterized in that, including first lens, be located first spacer ring behind the first lens, be located the second lens of first spacer ring rear side, be located the second spacer ring of second lens rear side, be located the third lens of second spacer ring rear side, be located the third spacer ring rear side, be located the fourth lens of third spacer ring rear side, be located the light filter of fourth lens rear side and be located the image space of light filter rear side, first lens and second lens are glass lens, third lens and fourth lens are plastic lens;

the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the phase side surface of the first lens is a concave surface;

2. The optical lens of claim 1, wherein the first lens has a d-ray refractive index of not less than 1.806010 and a d-ray abbe constant of not less than 40.95;

3. The projector optical lens of claim 1 wherein the first spacer ring brings the first lens to a distance of 11.06mm from the second lens;

4. The optical lens of claim 1, wherein the first lens has an anti-reflective multilayer anti-reflection film applied to an object side surface thereof.