CN2391216Y - an optical device - Google Patents

Abstract

The utility model discloses an optical path device applied to optical equipment, the optical path device comprises a light source unit, a reflection unit, a lens and a sensing unit, wherein the reflection unit is composed of at least one multi-faceted reflection mirror, so as to utilize the multi-faceted reflection mirror to reduce the space of the optical path, thereby compressing the volume of the optical path device.

Description

an optical device

The utility model relates to an optical path device used in optical equipment, in particular to an optical path device which uses a polygon mirror to guide and scan the optical path for processing.

In optical image equipment such as image scanners, photocopiers, etc., optical path devices are used for optical image processing, and the current general optical path devices use three to four glass lenses, which not only causes complex assembly problems , will also cause the optical path device to have the disadvantage of being too large. In this increasingly mature industry, how to effectively reduce the cost and miniaturize the final product is one of the main research topics. Referring to Fig. 1, in the prior art, an optical path device with only two mirrors is provided. In order to solve the shortcomings caused by the use of multiple mirrors in common optical path devices, the optical path device 1 includes a light source unit 11, a reflection unit 12, and a lens 13. And a sensing unit 14 (such as a charge-coupled device CCD), the light source unit 11 provides the light required for the imaging of the optical path device 1, and the reflection unit 12 guides the light path 16 reflected by the original document 15 after being scanned by the light source unit 11 To the lens 13, the lens 13 gathers the optical path 16 to form an image on the sensing unit 14, and converts it into a digital signal that can be processed by a computer. When considering how to reduce the volume of the optical path device, we will focus on how to reduce the space 17 occupied by the optical path. The space occupied by the optical path is determined by the reflection unit 12. The traditional optical path device uses 3 to The 4 pieces of reflective mirrors have the disadvantage of being too large in size, and the optical path device 1 is only equipped with 2 mirrors, so that the optical path is reflected multiple times on the 2 mirrors. Obviously, the volume of the optical path device is larger than that of the conventional optical mirror. The remote control device is smaller and more economical.

Please refer to FIG. 1 again. If the space 17 can be further compressed, the volume of the optical path device 1 can be further reduced. And the size of the space 17 can be determined by the angle r formed by the light in the eyeglasses 18, 19, if the smaller the r, the smaller the space 17 is. Now consider an optical path device, wherein the relative positions of the elements of the optical path device are the same as the optical path device of Fig. 1, if the light source unit 11 can be controlled to scan the original file 15 and reflect the optical path 16, so that the optical path 16 is within the lens If the angle r formed by 18 and 19 becomes smaller, the space 17 occupied by the optical path 16 can be reduced, thereby reducing the volume of the optical path device 1 . If the optical path device 1 in Figure 1 is controlled to have a small angle r, that is, the original document 15 is scanned by the light source unit 11 and the reflected optical path 16 has a small angle r when it hits the mirror 18, then the interference of the mirror 19 with the optical path must be considered. The problem that 16 is incident on the lens 18 makes it difficult to achieve the small angle r of the control optical path device 1 . Furthermore, if the angle r in FIG. 1 is too small, the output optical path 16 of the lens 19 is not easily received by the lens 13 , resulting in difficulty in design.

The purpose of the utility model is to provide an optical path device to reduce the object distance space of the optical path, thereby reducing the volume of the optical path device.

The purpose of the utility model is achieved through the following technical solutions: an optical path device, including a light source unit, a reflection unit, a lens and a sensing unit, wherein the reflection unit is composed of at least one multi-faceted mirror.

According to the above technical solution, the reflective unit may be composed of a polygonal reflector and a plane reflector, or two polygonal reflectors.

The base of the above-mentioned polygon mirror is a thermosetting plastic, and then the surface treatment is performed on the plastic substrate to form an optical reflection surface.

The utility model uses the polygon mirror to control the scanning optical path, so that the optical path occupies a smaller object distance space, and further compresses the volume of the optical path device.

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of an optical path device with multiple reflections of double mirrors.

Fig. 2 is a schematic diagram of the optical path device of the polygon mirror of the present invention.

Fig. 3 is a schematic diagram of another embodiment of the optical path device of the polygon mirror of the present invention.

Please refer to FIG. 2 , which is the optical path device of the present invention. The feature of the present invention is that the reflecting unit 22 uses a polygon mirror to guide the optical path 26 . The reflection unit 22 of the preferred embodiment of the present utility model utilizes a polygon mirror 28 and a plane mirror 29 to guide the optical path 26 to the lens 23, and the angle β of the optical path 26 at the two mirrors 28, 29 can be controlled by the polygon mirror 28, and Make β smaller than r, so that the space 27 occupied by the optical path of the present invention is smaller, and the volume of the optical path device 2 of the present invention is smaller. In the same way, the utility model can also use two polygon mirrors to realize the control of the angle β (refer to FIG. 3 ), so that the optical path takes up less space.

The utility model utilizes a multi-faceted mirror so that the optical path takes up less space. If the multi-faceted mirror of the present utility model uses the same glass lens as the conventional one, cost and technical issues need to be considered. Therefore, the utility model uses an optical reflection plate Structure, the reflector structure is based on a thermosetting plastic substrate, and then surface treatment is performed on the plastic substrate to form an optical reflection surface on the surface of the reflector, so as to guide the light path, because the plastic substrate It can be injection molded, so the problem of polygon mirror formation can be easily overcome, and the cost of forming can also be lower than that of flat glass lenses. Therefore, the utility model uses the polygon mirror to control the scanning optical path, so that the optical path occupies a smaller object distance space, the volume of the optical path device can be further compressed than conventional ones.

Claims (4)

1. An optical path device, comprising a light source unit, a reflection unit, a lens and a sensing unit, characterized in that the reflection unit is composed of at least one multi-faceted mirror. 2. The optical path device according to claim 1, wherein the reflecting unit comprises a polygonal reflecting mirror and a plane reflecting mirror. 3. The optical path device according to claim 1, wherein the reflecting unit comprises two polygonal reflecting mirrors. 4. The optical path device according to any one of claims 1 to 3, characterized in that: the base of the polygon mirror is made of thermosetting plastic.

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