CN216210490U

CN216210490U - Laser scanning unit and laser printer

Info

Publication number: CN216210490U
Application number: CN202122617183.XU
Authority: CN
Inventors: 唐波炯; 范志国
Original assignee: Lenovo Image Tianjin Technology Co Ltd; Lenovo Wanxiang Shenzhen Technology Co Ltd; Beijing Gaode Pinchuang Technology Co Ltd
Current assignee: Zhixiang Technology Co ltd; Lenovo Wanxiang Shenzhen Technology Co Ltd; Beijing Gaode Pinchuang Technology Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-04-05
Anticipated expiration: 2031-10-28

Abstract

The utility model discloses a laser scanning unit and a laser printer, wherein the laser scanning unit comprises: the laser generator, the lens group, the polygonal mirror motor, the F theta convergent lens and the selenium drum are arranged along the light path; an integration member disposed on an optical path between the polygon motor and the toner cartridge; a contemporaneous lens disposed on the integral element; when the integration element is the F theta lens, a first optical path reflected by the polygonal mirror motor is irradiated onto the toner cartridge through the F theta lens; and a second light path reflected by the polygonal mirror motor is irradiated to the synchronous signal receiver through the synchronous lens. With the arrangement, the independent synchronous lens can be removed and integrated with other devices, thereby saving the internal space of the laser scanning unit. Meanwhile, the independent synchronous lens is removed, so that the expense required by the expensive synchronous lens can be saved, and the production cost is reduced.

Description

Laser scanning unit and laser printer

Technical Field

The utility model relates to the technical field of laser printers, in particular to a laser scanning unit and a laser printer.

Background

The laser printer is internally provided with a laser scanning unit, wherein the laser scanning unit can irradiate through a laser of the laser scanning unit, a polygon mirror, a reflecting mirror and an F theta converging lens to form an electrostatic latent image on the selenium drum. In the process, an important component of the laser scanning unit is a synchronizing lens, which is used for transmitting a laser scanning line head signal, namely, the synchronizing lens is irradiated once when each rotating surface of the prism rotates, so that a line head signal is obtained, and the line head signal is used for detecting the line head time point of each line irradiated on the selenium drum and is mainly used for synchronization, so that the laser scanning unit is called as a synchronizing lens module.

Along with the miniaturized development of laser printer, the space that the contemporary lens that sets up alone occupy is great for laser printer can't further reduce the volume, has restricted laser printer's miniaturized development.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present invention is to provide a laser scanning unit and a laser printer, in which the laser printer cannot further reduce the volume because the space occupied by the separately arranged contemporaneous lens is large in the prior art.

To achieve the above object, an embodiment of the present invention provides a laser scanning unit, including: the laser generator, the lens group, the polygonal mirror motor, the F theta convergent lens and the selenium drum are arranged along the light path; an integration member disposed on an optical path between the polygon motor and the toner cartridge; a contemporaneous lens disposed on the integral element; when the integration element is the F theta lens, a first optical path reflected by the polygonal mirror motor is irradiated onto the toner cartridge through the F theta lens; and a second light path reflected by the polygonal mirror motor is irradiated to the synchronous signal receiver through the synchronous lens.

Alternatively, when the integration member is a focus lens, the focus lens is disposed on an optical path between the polygon motor and the F θ converging lens; the first optical path reflected by the polygon motor is irradiated onto the toner cartridge through the F θ converging lens by the focusing lens.

Alternatively, when the integration member is a mirror, the mirror is disposed on an optical path between the polygon motor and the F θ converging lens; the first light path reflected by the polygonal mirror motor is reflected to the F theta converging lens through the reflecting mirror and then is irradiated onto the toner cartridge through the F theta converging lens.

Optionally, the synchronous lens is provided with a reflection part, and the second optical path reflected by the polygon motor is reflected to the synchronous signal receiver through the reflection part of the synchronous lens.

Optionally, the contemporaneous lens forms the reflecting portion by applying a reflective image layer.

Optionally, the reflective portion is an arc reflective surface.

Optionally, the contemporaneous lens is integrally disposed with the integral element.

The embodiment of the utility model also provides a laser printer which comprises the laser scanning unit in any embodiment.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

1. an embodiment of the present invention provides a laser scanning unit, including: the laser generator, the lens group, the polygonal mirror motor, the F theta convergent lens and the selenium drum are arranged along the light path; an integration member disposed on an optical path between the polygon motor and the toner cartridge; a contemporaneous lens disposed on the integral element; when the integration element is the F theta lens, a first optical path reflected by the polygonal mirror motor is irradiated onto the toner cartridge through the F theta lens; and a second light path reflected by the polygonal mirror motor is irradiated to the synchronous signal receiver through the synchronous lens.

With the arrangement, the independent synchronous lens can be removed and integrated with other devices, thereby saving the internal space of the laser scanning unit. Meanwhile, the independent synchronous lens is removed, so that the expense required by the expensive synchronous lens can be saved, and the production cost is reduced.

2. According to the embodiment of the utility model, the arc-shaped reflecting surface is arranged, so that the laser beam emitted by the laser generator can be focused, a stronger synchronous signal can be obtained, and meanwhile, the interference of weak light can be eliminated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for a worker of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

Fig. 1 is a schematic view of a first structure of a laser scanning unit according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a second structure of a laser scanning unit according to an embodiment of the utility model.

Fig. 3 is a schematic diagram of a third structure of a laser scanning unit according to an embodiment of the utility model.

Reference numerals:

1. a laser generator; 2. a lens group; 3. a polygon motor; 4. a contemporaneous lens; 5. a F θ condenser lens; 6. a selenium drum; 7. a contemporaneous signal receiver; 8. a focusing lens; 9. a mirror.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a worker skilled in the art without creative efforts based on the embodiments of the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases by a worker of ordinary skill in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The laser printer is internally provided with a laser scanning unit, wherein the laser scanning unit can irradiate through a laser of the laser scanning unit, a polygon mirror, a reflecting mirror and an F theta converging lens to form an electrostatic latent image on the selenium drum. In the process, an important component of the laser scanning unit is a synchronizing lens, which is used for transmitting a laser scanning line head signal, namely, the synchronizing lens is irradiated once when each rotating surface of the prism rotates, so that a line head signal is obtained, and the line head signal is used for detecting the line head time point of each line irradiated on the selenium drum and is mainly used for synchronization, so that the laser scanning unit is called as a synchronizing lens module. Along with the miniaturized development of laser printer, the space that the contemporary lens that sets up alone occupy is great for laser printer can't further reduce the volume, has restricted laser printer's miniaturized development.

Example 1

An embodiment of the present invention provides a laser scanning unit, including: the lens system comprises a laser generator 1, a lens group 2, a polygonal mirror motor 3, an F theta converging lens 5, a selenium drum 6, an integrated element and a contemporary lens 4.

Specifically, in the embodiment of the present invention, the laser generator 1, the lens group 2, the polygon motor 3, the F θ converging lens 5, and the toner cartridge 6 are disposed along the optical path, and the integration member is disposed on the optical path between the polygon motor 3 and the toner cartridge 6, and the integration member may be any one of the components on the optical path between the polygon motor 3 and the toner cartridge 6, and the lens 4 needs to be disposed on the integration member.

Further, in the embodiment of the present invention, when the integration member is the F θ converging lens 5, as shown in fig. 1, the polygon motor 3 reflects the laser beam generated by the laser generator 1 to form a first optical path, and the first optical path is irradiated onto the toner drum 6 through the F θ converging lens 5. The polygon motor 3 may reflect the laser beam generated by the laser generator 1 to form a second optical path, and the second optical path is irradiated to the synchronization signal receiver 7 through the synchronization lens 4.

With this arrangement, the separate synchronizing lens 4 can be eliminated and integrated with any one of the components on the optical path between the polygon motor 3 and the toner cartridge 6, thereby saving the internal space of the laser scanning unit. Meanwhile, the cost required by the expensive contemporary lens 4 can be saved by removing the independent contemporary lens 4, thereby reducing the production cost.

In an alternative embodiment of the present invention, the laser scanning unit is further provided with a focusing lens 8, and the focusing lens 8 is disposed on an optical path between the polygon motor 3 and the F θ converging lens 5. As shown in fig. 2, when the integration member is a focusing lens 8, the first optical path formed by reflection of the polygon motor 3 is irradiated onto the cartridge 6 through the F θ converging lens 5 by the focusing lens 8. The second optical path, which is still illuminated through said contemporaneous lens 4 onto contemporaneous signal receiver 7, is unchanged.

In an alternative embodiment of the present invention, the laser scanning unit is further provided with a mirror 9, and the mirror 9 is disposed on an optical path between the polygon motor 3 and the F θ condenser lens 5. As shown in fig. 3, when the integration component is the reflecting mirror 9, the first optical path formed by the reflection of the polygon motor 3 is reflected to the F θ converging lens 5 by the reflecting mirror 9, and is irradiated onto the toner cartridge 6 by the F θ converging lens 5. In the present embodiment, likewise, the second optical path is not changed, and the second optical path is still irradiated to the synchronous signal receiver 7 through the synchronous lens 4.

Further, in one embodiment of the present invention, the contemporaneous lens 4 is provided with a reflecting portion, and the second optical path reflected by the polygon motor 3 is reflected onto the contemporaneous signal receiver 7 by the reflecting portion of the contemporaneous lens 4. Specifically, in the embodiment of the present invention, the synchronous lens 4 forms the reflection portion by applying a reflection pattern layer. The reflecting part is an arc reflecting surface.

According to the embodiment of the utility model, the arc-shaped reflecting surface is arranged, so that the laser beam emitted by the laser generator 1 can be focused, a stronger synchronous signal can be obtained, and meanwhile, the interference of weak light can be eliminated.

Optionally, the contemporaneous lens 4 is integrally provided with the integral element.

Example 2

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Variations and modifications in other variations may occur to those skilled in the art based upon the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A laser scanning unit, comprising:

the device comprises a laser generator (1), a lens group (2), a polygonal mirror motor (3) and a selenium drum (6) which are arranged along a light path;

an F theta lens (5) disposed on an optical path between the polygon motor (3) and the F theta lens (5);

the laser scanning unit further includes:

an integration member that is a component of the laser scanning unit disposed on an optical path between the polygon motor (3) and the toner cartridge (6);

a contemporaneous lens (4) disposed on said integral element;

when the integration element is the F theta converging lens (5), a first optical path reflected by the polygonal mirror motor (3) is irradiated onto the selenium drum (6) through the F theta converging lens (5); and a second optical path reflected by the polygonal mirror motor (3) is irradiated to a synchronous signal receiver (7) through the synchronous lens (4).

2. The laser scanning unit of claim 1, further comprising:

a focusing lens (8) disposed on an optical path between the polygon motor (3) and the F [ theta ] condensing lens (5);

when the integration element is the focusing lens (8), the first optical path reflected by the polygon motor (3) is irradiated onto the toner cartridge (6) through the F θ converging lens (5) by the focusing lens (8).

3. The laser scanning unit of claim 1, further comprising:

a mirror (9) disposed on an optical path between the polygon motor (3) and the F [ theta ] condensing lens (5);

when the integration element is the reflecting mirror (9), the first light path reflected by the polygonal mirror motor (3) is reflected to the F theta converging lens (5) through the reflecting mirror (9), and then is irradiated onto the toner cartridge (6) through the F theta converging lens (5).

4. The laser scanning unit according to any of claims 1 to 3, characterized in that said contemporaneous lens (4) is provided with a reflecting portion, said second optical path reflected by said polygon motor (3) being reflected by said reflecting portion of said contemporaneous lens (4) onto a contemporaneous signal receiver (7).

5. Laser scanning unit according to claim 4, characterized in that said contemporaneous lens (4) forms said reflecting portion by applying a reflecting coating.

6. The laser scanning unit of claim 4, wherein the reflective portion is an arc-shaped reflective surface.

7. Laser scanning unit according to any of claims 1 to 3, characterized in that the contemporaneous lens (4) is integral with the integrating element.

8. A laser printer, comprising: the laser scanning unit of any one of claims 1 to 7.