CN210090715U - Tri-cemented prism for shortening focal length - Google Patents
Tri-cemented prism for shortening focal length Download PDFInfo
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- CN210090715U CN210090715U CN201921188954.4U CN201921188954U CN210090715U CN 210090715 U CN210090715 U CN 210090715U CN 201921188954 U CN201921188954 U CN 201921188954U CN 210090715 U CN210090715 U CN 210090715U
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- prism
- focal length
- pentaprisms
- reflection
- shortening
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Abstract
The utility model discloses a three cemented prism for shortening focus belongs to prism technical field, and it includes two half pentaprisms and a roof prism, two half pentaprism symmetry bonds and is in roof prism's both sides, two all plate high anti-membrane, one of them on the plane of reflection that half pentaprism is close to each other set up the division line on the plane of reflection. The utility model discloses can effectively shorten light path formation of image distance, can realize the imaging system that aims of high magnification on the short rifle.
Description
Technical Field
The utility model relates to a prism technical field specifically is a three cemented prism for shortening focus.
Background
In order to reduce the size of products such as a gun sight, a combined prism capable of shortening the focal length is needed, and a patent with the publication number of CN 207992488U discloses a prism capable of shortening the focal length. The novel optical fiber laser beam splitter comprises a first right-angle prism, a second right-angle prism, a third prism and a fourth prism, wherein the horizontal plane of the second right-angle prism and the bottom surface of the third prism are fixed on the first bottom surface of the first right-angle prism through optical adhesives, the fourth prism is fixed on the end surface of the third prism through the optical adhesives, the fourth prism comprises an injection surface, the second right-angle prism comprises an injection surface, and the injection surface are parallel surfaces. By adopting the scheme, the prism assembly has a compact structure, the distance between the incident surface and the emergent surface is shortened under the condition that the distance between the light path and the emergent surface is not changed, and the incident optical axis and the emergent optical axis are in the same direction. However, the utility model adopts four prisms for gluing, which is not only high in cost, but also needs the right center butt joint and bonding of each contact surface in the gluing process, and the processing difficulty is large.
Disclosure of Invention
In view of this, the utility model provides a to the not enough of prior art, the triple-cemented prism who is used for shortening the focus that provides can shorten the focus, and with low costs, and the processing degree of difficulty is little.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: a tri-cemented prism for shortening focal length comprises two semi-pentaprisms and a roof prism, wherein the two semi-pentaprisms are symmetrically adhered to two sides of the roof prism, high-reflection films are plated on reflecting surfaces of the two semi-pentaprisms, which are close to each other, and a division line is arranged on one of the reflecting surfaces.
Furthermore, the half pentaprism is formed by beveling the pentaprism.
Further, the high reflection film is a metal reflection film.
Further, the division line is engraved on the reflecting surface by laser.
Furthermore, the non-working surfaces of the two half pentaprisms and the one ridge prism are coated with extinction layers.
Furthermore, the roof prism is bonded with the two half pentaprisms through acrylic acid cool photosensitive adhesive.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model is used for shorten three cemented prism of focus, a pair of half pentaprism through the non-roof surface bilateral symmetry at a roof prism bonds, light gets into from one of them half pentaprism, comes from another half pentaprism parallel reflection through multiple reflection, and incident light and emergent light can keep on a straight line moreover to, when obtaining certain light path distance, make three cemented prism have less volume, the practicality is strong.
In addition, the high-reflection film is a metal reflection film, such as a high-reflection silver film, and the film layer is firm and stable and has strong reflection capability; the division line is carved on the reflecting surface by laser, which overcomes the problems of unstable quality, low efficiency and poor repeatability in the chemical corrosion carving which is commonly used at present; the non-working surfaces of the two half pentaprisms and the one ridge prism are coated with a light eliminating layer, such as an ink layer, and the light eliminating layer is used for absorbing stray light outside an effective aperture of the lens and preventing the stray light from penetrating through a photosensitive chip to form glare and influence the imaging quality; the roof prism and the half pentaprism are bonded through acrylic acid photosensitive adhesive, so that the roof prism is good in transparency, ageing-resistant, rapid in curing and capable of reducing refraction influence.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a light path diagram of the present invention.
Detailed Description
For a better understanding of the present invention, the contents of the present invention will be further clarified below by referring to examples, but the present invention is not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
Example one
As shown in fig. 1-2, a triple-cemented prism for shortening a focal length includes two half-pentaprisms and a roof prism 1, the two half-pentaprisms are symmetrically adhered to two sides of the roof prism 1, high-reflection films are plated on mutually adjacent reflection surfaces of the two half-pentaprisms, and a division line is arranged on one of the reflection surfaces.
Specifically, the half pentaprism is formed by beveling a pentaprism; the high reflection film is a metal reflection film, and a silver reflection film can be selected; the division lines are engraved on the reflecting surface by laser, and the non-working surfaces of the two half pentaprisms and the ridge prism are coated with a light extinction layer, and an ink layer can be optionally coated.
And a high-reflection silver film is plated on the reflecting surface a of the first half pentaprism 2 and the reflecting surface b of the second half pentaprism 3, and the reflecting surface b is engraved with laser to form a dividing line.
The utility model discloses a 3 the prism is to 7 reflections and deflections of light path, finally reaches the purpose that shortens the light path formation of image, and the most common use is exactly that long rifle snipers riflescope need very long light path system formation of image before, uses this veneer prism after, and light path formation of image distance can shorten 80%, also can realize the imaging system that aims of high magnification on short rifle. The processing process is mainly divided into several parts: the film coating part is mainly used for coating a metal or high-reflection medium high-reflection film by using a vacuum film coating machine, reflecting light source image information for 7 times, restoring lossless vectors to an imaging end, and coating a high-efficiency antireflection film to improve the utilization rate of reflection energy intensity. The laser etching-off reticle part mainly refers to that the reticle is required to be etched at the terminal of an imaging system, namely, a specified dial scale is etched on a metal film plated on an outlet reflecting surface, the width of the specified dial scale is only 0.01mm, and an aiming system for assisting gun aiming accurately judges the error digital display difference of an imaging graph from the center of a differentiation reticle. The gluing part is mainly designed with a special V-shaped bearing seat, glass is placed in the bearing seat after being glued, the basic gluing shape of 3 pieces of glass is corrected through the bearing seat and the eccentricity degree is within a controllable range, then the 3 pieces of glass gluing surface in-out imaging graphs can be clearly imaged on a display screen through a 270-degree rotation angle instrument, finally, the relative position of the 3 pieces of glass is manually twisted on a tool, the positions of the 3 pieces of graphs are twisted to be in a basic coincidence state, the gluing surface is irradiated by a UV light source, and the whole gluing process is completed.
The UV adhesive can be cured by UV light irradiation, and 3 parts can be stably cured after 4 hours of irradiation.
Example two
As shown in fig. 1-2, a triple-cemented prism for shortening a focal length includes two half-pentaprisms and a roof prism 1, the two half-pentaprisms are symmetrically adhered to two sides of the roof prism 1, high-reflection films are plated on mutually adjacent reflection surfaces of the two half-pentaprisms, and a division line is arranged on one of the reflection surfaces. Specifically, the half pentaprism is formed by beveling a pentaprism; the high reflection film is a metal reflection film, and a silver reflection film can be selected; the division lines are engraved on the reflecting surface by laser, and the non-working surfaces of the two half pentaprisms and the ridge prism are coated with a light extinction layer, and an ink layer can be optionally coated.
And a high-reflection silver film is plated on the reflecting surface a of the first half pentaprism 2 and the reflecting surface b of the second half pentaprism 3, and the reflecting surface b is engraved with laser to form a dividing line.
The utility model discloses a three cemented prism for shortening focus, with embodiment one the difference lie in: the roof prism is bonded with the two half pentaprisms through acrylic acid cool photosensitive adhesive, so that the roof prism is good in transparency, ageing-resistant, rapid in curing and capable of reducing refraction influence.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent replacements made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A triplex prism for shortening focal length, comprising: the high-reflection film comprises two half-pentaprisms and a roof prism, wherein the two half-pentaprisms are symmetrically adhered to two sides of the roof prism, high-reflection films are plated on reflection surfaces, close to each other, of the two half-pentaprisms, and a division line is arranged on one of the reflection surfaces.
2. The triple-cemented prism for shortening focal length of claim 1, wherein: the half pentaprism is formed by beveling a pentaprism.
3. The triple-cemented prism for shortening focal length of claim 2, wherein: the high reflection film is a metal reflection film.
4. The triple-cemented prism for shortening focal length of claim 3, wherein: the division lines are carved on the reflecting surface by laser.
5. The triple-cemented prism for shortening focal length of claim 4, wherein: and the non-working surfaces of the two half pentaprisms and the one ridge prism are coated with extinction layers.
6. The triple-cemented prism for shortening focal length of claim 5, wherein: the roof prism is bonded with the two half pentaprisms through acrylic acid cool photosensitive adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921188954.4U CN210090715U (en) | 2019-07-26 | 2019-07-26 | Tri-cemented prism for shortening focal length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921188954.4U CN210090715U (en) | 2019-07-26 | 2019-07-26 | Tri-cemented prism for shortening focal length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210090715U true CN210090715U (en) | 2020-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921188954.4U Active CN210090715U (en) | 2019-07-26 | 2019-07-26 | Tri-cemented prism for shortening focal length |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210090715U (en) |
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2019
- 2019-07-26 CN CN201921188954.4U patent/CN210090715U/en active Active
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Address after: 473000 block g, photoelectric Incubation Park, high tech Zone, Nanyang City, Henan Province Patentee after: Nanyang Yingrui Photoelectric Technology Co.,Ltd. Address before: 473000 photoelectric Incubation Park, Wancheng District, Nanyang City, Henan Province Patentee before: NANYANG YINGRUI PHOTOELECTRIC POLYTRON TECHNOLOGIES Inc. |