CN103605175B - A kind of optical filter - Google Patents

Abstract

The invention provides an optical filter, which belongs to the field of optical technology. It solves the problems of high cost and loss of incoming light in the existing optical filter. The optical filter includes a rectangular frame and a sheet-shaped rectangular filter body. The middle part of the rectangular frame is provided with a through hole composed of a light-passing part and a filter part. The filter body is arranged at the filter part. The thickness is 0.06mm to 0.08mm, and the rectangular frame is also provided with a fixing structure for fixing the filter body at the filter part. The invention has the advantages of low cost, no loss of light and the like.

Description

a filter

technical field

The invention belongs to the field of optical technology, and relates to an optical filter, in particular to an optical filter for a camera.

Background technique

Infrared camera is a kind of common electronic monitoring equipment. There is a filter at the front of the lens box. There is only one filter in the common infrared camera. During the working process of this kind of infrared camera, it is easy to be affected by the infrared light source in nature during the daytime. Interference causes the problem of CCD imaging color shift, and at night, due to visible light interference, the shooting effect is affected, and the use effect is not satisfactory. In order to obtain good images under both natural light source and infrared light source, the existing method is to install an infrared filter switching device in the camera. The filter is generally composed of a frame and filter glass. The thickness of the glass is 0.3mm to 0.4mm. After adjusting the focal length of the camera during the day, once the filter is switched, the focal length of the camera will change, resulting in blurred images. It is necessary to readjust the focal length of the camera. Adjustment, operation is inconvenient and difficult to realize.

To this end, two pieces of glass are set in the filter: one piece of filter glass and one piece of ordinary glass. Workers are required to install the two pieces of glass into the frame respectively. During the day, the filter glass is switched to the photosensitive position, and at night The glass is switched to the photosensitive position for better imaging. During installation, two pieces of glass will collide and be squeezed, resulting in chipping and polluting the main plane of the filter. The installation accuracy is poor and the yield rate is low, thereby affecting the camera quality. Moreover, the thickness of the filter glass sold in the market is 0.3mm to 0.4mm, which is relatively thick. The arrangement of two pieces of glass leads to high cost of the filter, which is at a disadvantage in market competitiveness.

Contents of the invention

The object of the present invention is to solve the above-mentioned problems in the existing technology, and propose a low-cost optical filter without loss of light.

The purpose of the present invention can be achieved through the following technical solutions:

An optical filter, comprising a rectangular frame and a sheet-shaped rectangular optical filter body, the middle part of the rectangular frame is provided with a through hole composed of a light-transmitting part and a light-filtering part, and the optical filter body is arranged on the filter Partially, it is characterized in that the thickness of the filter body is 0.06 mm to 0.08 mm, and the rectangular frame is also provided with a fixing structure for fixing the filter body at the filter part.

The filter body is only mounted on the filter part of the through hole, which saves the material used in the light pass part compared with the prior art, so that the manufacturing cost of the filter is low; since the thickness of the filter body is 0.06mm to 0.08mm, when the filter is switched between the light-passing part and the light-filtering part, the change of the focal length of the camera is small and negligible, which ensures the imaging effect of the camera; There is no loss of light in the light-passing part, and the effect of the camera is better.

In the above optical filter, the light-passing part and the filter part are rectangular and equal in size, the light-passing part is located on one side of the center line of the through hole, and the filter part is located in the center of the through hole On the other side of the line, one side of the filter coincides with the center line of the through hole.

In the above optical filter, the fixed structure includes installation part one, installation part two and installation part three arranged at the filter part, the installation part one and the installation part three are arranged oppositely, and the installation part three The second part is arranged opposite to the above-mentioned light-transmitting part, and the upper surfaces of the first, second and third installation parts form an installation plane, and one side of the filter body is attached to the installation plane. An adhesive is provided between the installation plane and the filter body.

During actual manufacture, the other side of the filter body is flush with the surface of the rectangular frame, so that the thickness of the entire filter body is smaller than that of the rectangular frame. The filter body is fixed by the installation part 1, the installation part 2 and the installation part 3, which ensures the stability of the filter body and effectively prolongs the service life.

In the above-mentioned optical filter, the first installation part has a limit surface one coincident with the center line of the through hole, and the third installation part has a limit surface coincident with the center line of the through hole Second, the sides of the above-mentioned optical filter that coincide with the center line of the through hole abut against the limiting surface 1 and the limiting surface 2 at the same time.

Limiting surface 1 and limiting surface 2 can limit the position of the filter body, so that one side of the filter body coincides with the center line of the through hole.

In the above optical filter, the thickness of the optical filter body is 0.07 mm.

In the above optical filter, the optical filter body is made of glass material.

In the above optical filter, the optical filter body is made of crystal material.

Compared with the prior art, this optical filter has the following advantages:

There is a fixed structure on the rectangular frame, which can fix the filter body at the filter part, which ensures the stability of the filter body and effectively prolongs the service life; the filter is easy to install and is only installed on the filter part of the through hole Compared with the prior art, the optical filter saves the material used in the light-passing part, which makes the manufacturing cost of the optical filter low and the installation more convenient; since the thickness of the optical filter is 0.06mm to 0.08mm, when the optical filter When the film is switched between the light-passing part and the filter part, the change of the focal length of the camera is small and negligible, which ensures the imaging effect of the camera; and the light-passing part is not equipped with a filter body, so that the light entering the light-passing part Loss, the effect of the camera is better.

Description of drawings

Fig. 1 is a top view of a rectangular frame provided by the present invention.

Fig. 2 is a top view of a preferred embodiment provided by the present invention.

Fig. 3 is a bottom view of a preferred embodiment provided by the present invention.

In the figure, 1, rectangular frame; 11, light-transmitting part; 12, filter part; 13, clamping hole; 2, filter body; 21, installation part one; 211, limit surface one; 22, installation part two; 23. Installation part three; 231. Limiting surface two; 31. Support bar one; 32. Support bar two; 33. Support part.

detailed description

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

Embodiment one

This optical filter comprises a rectangular frame 1 and a sheet-shaped rectangular filter body 2, as shown in Figure 1, the middle part of the rectangular frame 1 is provided with a through hole consisting of a light-transmitting part 11 and a light-filtering part 12, as shown in Figure As shown in 2, the filter body 2 is arranged at the filter portion 12, wherein the thickness of the filter body 2 is 0.06 mm to 0.08 mm, and in this embodiment, the thickness of the filter body 2 is 0.07 mm.

On the rectangular frame 1, there is also a fixed structure for fixing the filter body 2 on the filter part 12. As shown in Figure 1, the light-passing part 11 and the filter part 12 are rectangular and equal in size, and the light-passing part 11 is located on one side of the center line of the through hole, the filter part 12 is located on the other side of the center line of the through hole, and one side of the filter body 2 coincides with the center line of the through hole.

Specifically as shown in Figure 1, the fixing structure includes a mounting part 1 21, a mounting part 22 and a mounting part 3 23 arranged at the filter part 12, the mounting part 1 21 is arranged opposite to the mounting part 3 23, and the mounting part 2 22 Set opposite to the light-passing part 11, the upper surfaces of the first installation part 21, the second installation part 22 and the third installation part 23 form an installation plane, one side of the filter body 2 fits the installation plane, and the installation plane and the filter An adhesive is provided between the bodies 2 . As shown in FIG. 2 , the other side of the filter body 2 is flush with the surface of the rectangular frame 1 , so that the thickness of the entire filter body 2 is smaller than the thickness of the rectangular frame 1 .

As shown in Figure 1, the first mounting part 21 has a limiting surface 1 211 that coincides with the centerline of the through hole, and the third mounting part 23 has a limiting surface 2 231 that coincides with the centerline of the through hole. The sides of the body 2 coincident with the center line of the through hole abut against the first limiting surface 211 and the second limiting surface 231 . The first limiting surface 211 and the second limiting surface 231 can limit the position of the filter body, so that one side of the filter body coincides with the center line of the through hole.

The filter body 2 in this embodiment is made of glass material.

In this embodiment, a supporting structure is also provided on the rectangular frame 1 .

Concretely, as shown in Fig. 2 and Fig. 3, the support structure includes several support strips 1 31 on one side of the rectangular frame 1 and several support strips 2 32 on the other side of the rectangular frame 1, as shown in Fig. 2 , several support strips Strip one 31 is evenly distributed and is respectively positioned at two long sides of rectangular glass, as shown in Figure 3, and support strip two 32 is evenly distributed and is respectively positioned at two long sides of rectangular glass, and support strip one 31 moves along the direction of rectangular frame 1 Extending, the supporting bar 2 32 also extends along the moving direction of the rectangular frame 1 . The first support bar 31 and the second support bar 32 can support the rectangular frame 1, reduce the wear and tear of the rectangular frame 1, and also play a guiding role for the rectangular frame 1, improving the accuracy of the rectangular frame 1 when moving.

As shown in FIG. 2 , there are four supporting bars 1 31 .

As shown in FIG. 3 , there are two supporting bars 2 32 .

As shown in FIG. 1 , FIG. 2 and FIG. 3 , one end of the rectangular frame 1 located on the short side is provided with an extension part, and the extension part is provided with a locking hole 13 .

As shown in Fig. 1, Fig. 2 and Fig. 3, four arc-shaped supporting parts 33 are arranged on the edge of the rectangular frame 1, wherein the first supporting part 33 and the second supporting part 33 are located on the rectangular frame 1 On one long side of the rectangular frame 1, the third supporting part 33 is located on the other long side of the rectangular frame 1, and the fourth supporting part 33 is located on the side wall of the above-mentioned extension part. The supporting part 33 reduces wear of the rectangular frame 1 and improves the service life of the rectangular frame 1 .

Embodiment two

The structural principle of this embodiment is basically the same as that of the first embodiment, except that the filter body 2 is made of crystal material.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (7)

1. an optical filter, comprise rectangular frame (1) and rectangle optical filtering body (2) in the form of sheets, the middle part of described rectangular frame (1) is provided with the through hole be made up of logical light part (11) and the part (12) that filters, described optical filtering body (2) is located at optical filtering part (12) place, it is characterized in that, the thickness of described optical filtering body (2) is 0.06mm to 0.08mm, described rectangular frame (1) is also provided with the fixed sturcture for optical filtering body (2) being fixed on optical filtering part (12) place.

2. a kind of optical filter according to claim 1, it is characterized in that, described logical light part (11) and part (12) all rectangular and equal and opposite in direction that filters, described logical light part (11) is positioned at the side of through hole center line, described optical filtering part (12) is positioned at the opposite side of through hole center line, and a side of above-mentioned optical filtering body (2) overlaps with the center line of through hole.

3. a kind of optical filter according to claim 2, it is characterized in that, described fixed sturcture comprises the installation portion one (21) being located at optical filtering part (12) place, installation portion two (22) and installation portion three (23), described installation portion one (21) is oppositely arranged with installation portion three (23), described installation portion two (22) is oppositely arranged with above-mentioned logical light part (11), described installation portion one (21), the upper surface of installation portion two (22) and installation portion three (23) forms a mounting plane, side and this mounting plane of described optical filtering body (2) fit, bonding agent is provided with between described mounting plane and optical filtering body (2).

4. a kind of optical filter according to claim 3, it is characterized in that, there is in described installation portion one (21) confined planes one (211) coincided with the center line of through hole, have the confined planes two (231) coincided with the center line of through hole in described installation portion three (23), the side overlapped with the center line of through hole of above-mentioned optical filtering body (2) is resisted against on confined planes one (211) and confined planes two (231) simultaneously.

5. a kind of optical filter according to claim 1 or 2 or 3 or 4, is characterized in that, the thickness of described optical filtering body (2) is 0.07mm.

6. a kind of optical filter according to claim 1 or 2 or 3 or 4, is characterized in that, described optical filtering body (2) is made up of glass material.

7. a kind of optical filter according to claim 1 or 2 or 3 or 4, is characterized in that, described optical filtering body (2) is made up of crystal material.