TWI810735B - Lightweight high-magnification camera lens with aberration cancellation - Google Patents

Abstract

A light-duty high-magnification camera lens with the function of eliminating aberration. Firstly, a first optical mirror and a second optical mirror are arranged at the aperture stop in the lens housing to eliminate the aberration of light and shadow; The main reflector, wherein the secondary reflector is formed smaller and bonded with a third optical lens, and the main reflector is respectively provided with a first field mirror and a second field mirror on the front side and the back side, and An image sensor is installed behind the second field lens. In this way, not only can high-quality imaging with aberrations eliminated, but also clearer shooting, and more convenient assembly and adjustment.

Description

Lightweight high-magnification camera lens with aberration cancellation function

The invention relates to a light-duty high-power camera lens with the function of eliminating aberration; especially a light-duty camera lens device suitable for use on hand-held electronic products such as mobile phones or tablet computers, which can be directly installed on the mobile phone or tablet, and combined with the The combination of the camera system on the original mobile phone or tablet can switch the lens modules with different focal lengths, and can take pictures of people or objects to be photographed at close or long distances with different focal lengths, and the high-definition and high-magnification lighting is Purpose.

In addition to being light, thin, short, and small, the light-weight camera lenses on handheld electronic products such as mobile phones and tablet computers today also need to have high magnification and good definition to meet the expectations of consumers. Because the mobile phone or tablet computer itself still has other main functions, so photographing or photography is only one of its multi-functional items, but only in terms of the function of taking pictures, due to the limitation of mobile phone or tablet computer must have The thickness is relatively thin, so the camera function on this device is limited by the volume factor. The lens and motor cannot be equipped with a zoom lens like a professional camera. Because there is no large space, this makes it possible to take pictures with a mobile phone today. Standard The focal length of the lens is 3.5mm as the standard, which makes the focal length of the lens limited, and it is impossible to take the best shots of people and objects at a little distance; Lens, one of the two groups of lenses is set vertically (for example, 3.5mm lens), and the other is set horizontally (limited by space factors, only several times larger than 3.5mm lens), and the two lenses can be switched separately by the operation of the system make However, although it is a second lens, it is still limited by the thickness of the mobile phone, so the focal length of the lens is still limited to a certain extent. Although the switching of the second lens can be used to shoot with different focal lengths, but The results are still very limited, that is, although the lens can be switched, compared with the standard 3.5mm lens, the multiples that can zoom in on the object image are still very limited. Due to the small multiples of zooming in, for those who need to shoot from a distance As far as the current lens switching is only 2x or 4x, it can be said that there is no special significance, so that the design of the switching lens does not fundamentally improve the focal length of the shooting, which makes the existing dual The design of the camera lens is mostly an advertising gimmick, but the effect is very limited.

Conventionally, for the above problems, there is a development of telephoto reflective lens. However, the conventional design of the traditional secondary reflector not only blocks too much light, affects the amount of light entering, but also reduces the resolution of the optical system, and it is difficult to manufacture and assemble. , if using aspherical optical lenses is better, but the cost is too high, if using glass spherical lenses can reduce the cost, but the spherical chromatic aberration is large, it is not easy to design, assemble and adjust, and often fall into a dilemma in design And difficult to break through.

The main purpose of the present invention is to design a reflective telephoto objective lens with a larger aperture, mainly to first pass the light through three to four optical lenses, and then inject the light into the main reflector, and the light first passes through the main reflection The bottom reflective area of the light-facing surface of the mirror, and then reflected to the secondary reflector placed in front of the third lens, enters the bottom reflective area of the light-facing surface of the secondary reflector, and then reflects back to the field mirror in the middle of the main reflector, and finally reaches Image sensor imaging not only solves the problem of large chromatic aberration caused by the use of lower-cost spherical lenses, but also achieves a resolution of tens of millions of pixels. The pixel size is 1.5 microns (μm). The difficulty of assembling and adjusting the optical system of the lens of the present invention is reduced, so that the present invention has the advantage of reducing costs, and the present invention can reduce the size of the secondary mirror to 36-40%. To reduce light obstruction, get bright and clear picture quality.

In order to achieve the above-mentioned purpose, the present invention can be achieved in the following manner: the aperture stop in the lens housing is provided with: a first optical mirror, which is a concave lens, and the concave lens of the first optical mirror The arc surface is located at the aperture stop; a second optical mirror is a convex lens; the second optical mirror and the first optical mirror in front are eliminating the aberration of light and shadow; the primary reflector is arranged on the second optical mirror At the rear, the diameter of the secondary reflector is smaller than that of the second optical mirror, and the side facing the second optical mirror is set as a concave arc surface, and the bottom reflection area is formed on the back side of the concave arc surface; a main reflector The mirror is a concave arc body formed toward the aperture stop of the lens housing, and a first field mirror and a second field mirror are respectively provided on the front side and the back side, and at the front light-facing surface of the main reflector, There is a bottom reflective area; an image sensor is arranged behind the second field lens on the back side of the main reflector to receive high-quality imaging light with aberration eliminated.

Another object of the present invention is to reduce the secondary reflector of the present invention to less than 40% of the original lens, so that a better light-incoming space can be obtained in the peripheral area of the secondary reflector, so that a better light-incoming space can be obtained when taking pictures. Bright and clear images.

Another object of the present invention is that the secondary reflector of the present invention is reduced to 40% of the diameter of the original mirror, but because a third optical mirror is attached to it, the third optical mirror is directly formed as a secondary reflector. The supporting body of the reflecting mirror will be more convenient in assembly and adjustment, and at the same time, because the third optical mirror itself is light-transmitting, it will not have the disadvantage of blocking light.

〔this invention〕

1: camera lens

10: The first optical mirror

11: concave arc surface

20: Second optical mirror

30: secondary reflector

301: concave arc surface

31: Bottom reflection area

40: The third optical mirror

41: secondary mirror

50: Primary reflector

51: Bottom reflection area

60: The first shot

61: The second shot

70: Image sensor

80: Lens housing

81: Aperture diaphragm

90: mobile phone

91: camera lens

M1: Camera Scenic Area

M2: Camera Scenic Area

L: light

Fig. 1 is a schematic diagram illustrating the progress of light when the present invention is combined and implemented.

Fig. 2 is an exploded view 1 of the optical system of the present invention.

Fig. 3 is an exploded view 2 of the optical system of the present invention.

Fig. 4 is a sectional view of the optical system of the present invention.

Fig. 5 is a schematic diagram of the display of the present invention used on a mobile phone.

Fig. 6 is a structural explanatory diagram of another embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating the light traveling in FIG. 6 .

Please refer to Figure 1, Figure 2, Figure 3, and Figure 4. Figure 1 and Figure 2 are exploded views of the front and rear views respectively. Cooperate with Figure 3 and Figure 4 to explain the structure of the lens in detail. Inventing the camera lens 1, the aperture stop 81 (i.e. aperture stop) in the lens housing 80 is mainly provided with:

A first optical mirror 10 is a concave lens, and the concave arc surface 11 of the first optical mirror 10 is located at the aperture stop 81 to receive light.

A second optical mirror 20 is a convex lens; and the second optical mirror 20 and the first optical mirror 10 in front can correct the aberration of light and shadow.

The primary reflector 30 is located behind the second optical mirror 20, the diameter of the secondary reflector 30 is less than 40% of the diameter of the second optical mirror 20, and is arranged on the side facing the second optical mirror 20. It is a concave arc surface 301, and the bottom reflection area 31 is formed on the back side of the concave arc surface 301; the secondary reflector 30 is small in size, and is connected with other optical systems on the center line, such as: the first optical mirror 10 and the second optical mirror 30. When the centerlines of the optical mirrors 20 are aligned, the sub-reflector 30 should be provided with a fixture to suspend it in the lens housing 80 , but the fixture can be a conventionally known design, and will not be repeated here.

In order to obtain better fixation of the aforementioned smaller secondary reflector 30 without shielding light, the present invention is provided with a third optical mirror 40, which is arranged behind the secondary reflector 30, and makes the secondary reflector 30 The secondary reflector 30 is attached to the third optical mirror 40, so that the third optical mirror 40 is a supporting secondary mirror. The structural body of the reflecting mirror 30, and the third optical mirror 40 is light-transmitting, so it does not have the disadvantage of shading light, which is more excellent than the conventional use of a simple lens holder.

A main reflector 50 forms a concave arc body toward the aperture stop 81 of the lens housing 80, and a first field lens 60 and a second field lens 61 are respectively provided on the front side and the back side respectively. A bottom reflection area 51 is provided on the front light-receiving surface of the mirror 50 .

An image sensor 70 is arranged behind the second field lens 61 on the back side of the main reflector 50 to receive high-quality imaging light L.

When the present invention is in use, as shown in FIG. 1, when light L enters through the aperture stop 81 of the lens housing 80 and passes through the first optical mirror 10 and the second optical mirror 20, the aberration can be eliminated in advance, and thus Reflector 30 is small in volume, and the incoming light L directly passes through the outer ring area of the third optical mirror 40 to the main reflector 50 from the peripheral outer space of the secondary reflector 30, and then passes through the bottom reflection area of the main reflector 50 51 is reflected forward to the bottom reflection area 31 of the secondary reflector 30, and then emitted toward the first field mirror 60 in front of the main reflector 50. After the light L is reduced by the first field mirror 60 and the second field mirror 61, the image is A high-quality image is formed and then transmitted to the image sensor 70 for reception, so as to obtain a high-magnification camera function with a long focal length.

Please refer to shown in Fig. 5, camera lens 1 of the present invention can carry out wired or wireless signal connection with mobile phone 90, when the camera lens 91 of mobile phone 90 is aimed at camera scene, can produce general camera scene area M1, when wanting to use the present invention When the camera lens 1 of the present invention is used, as long as the coaxial center position is aimed at the scene to be enlarged (when the trees in Fig. 5), the existing electronic equipment can switch the camera scenic spot M2 captured by the camera lens 1 of the present invention. The invented reflective telephoto design also has the function of eliminating aberration, so that the magnified scene is clearly presented.

Please refer to Fig. 6 and Fig. 7, it is mainly the embodiment of the simple and easy addition of the present invention, is On the side of the main reflector 50 of the third optical mirror 40, a secondary mirror 41 is attached. The secondary mirror 41 is an optical lens for image adjustment; it can be mainly used to eliminate aberrations or filter unnecessary colored wavelengths. , which makes the primary reflector 50 reflect the light L to the secondary reflector 30, pass through the secondary mirror 41 and the third optical mirror 40 respectively, and then move towards the first field mirror 60 in front of the primary reflector 50 from the secondary reflector 30 After being emitted, the light L passes through the first field lens 60 and the second field lens 61 to reduce the image to form a required high-quality image and then transmits it to the image sensor 70 for reception, thereby obtaining a high-magnification imaging function with a long focal length.

Therefore, when using the present invention, will have following advantage:

1. Since the present invention uses a reflective magnification design, a first optical mirror and a second optical mirror are provided in front to eliminate aberrations and make the image quality clearer, which is the main advantage of the present invention.

2. Since the present invention reduces the diameter of the secondary reflector to less than 40% of the original lens diameter, the outer side of the reflector will not have the disadvantages of conventional shading, and overall, better light can be obtained , so the present invention can obtain a brighter and clearer scene, which is another advantage of the present invention.

3. In view of the above, the sub-reflector of the present invention is reduced, but a third optical mirror is attached to it, so that the third optical mirror is a structure supporting the sub-reflector, and the third optical mirror itself is It is light-transmitting, so it will not have the disadvantage of shading. It is better than the usual lens holder, and it is more convenient to assemble and adjust.

The structure described in the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention; therefore, those who are familiar with the equivalent or easy changes made by this technology will not depart from the spirit and scope of this creation. Equal changes and modifications made, such as substantially changing the shape or size of the lens, replacing the number of convex and concave mirrors with equivalents, using similar optical systems, or using the same material, etc., but those that use the features of the present invention are all should be covered by the features of the present invention.

1: camera lens

10: The first optical mirror

11: concave arc surface

20: Second optical mirror

30: secondary reflector

301: concave arc surface

31: Bottom reflection area

40: The third optical mirror

50: Primary reflector

51: Bottom reflection area

60: The first shot

61: The second shot

70: Image sensor

80: Lens housing

81: Aperture diaphragm

L: light

Claims (2)

A light-duty high-magnification camera lens with the function of eliminating aberration, which is sequentially provided at the aperture stop in the lens housing: a first optical mirror, which is a concave lens, and the concave arc surface of the first optical mirror is located at the At the aperture stop; a second optical mirror is a convex lens; the second optical mirror and the first optical mirror in front are eliminating the aberration of light and shadow; a reflector is arranged behind the second optical mirror , the diameter of the secondary reflector is less than 40% of the diameter of the second optical mirror, and the side facing the second optical mirror is set as a concave arc surface, and the bottom reflector is formed on the back side of the concave arc surface area; a main reflector, which forms a concave arc body towards the aperture stop direction of the lens housing, and is respectively provided with a first field mirror and a second field mirror on the front side and the back side, and on the front side of the main reflector A bottom reflective area is provided on the light-receiving surface; a third optical mirror is provided between the secondary reflector and the main reflector, and the secondary reflector is attached to the third optical mirror; an image sensor The device is arranged behind the second field lens on the back side of the main reflector to receive imaging light. As for the light-duty high-power camera lens with aberration elimination function described in claim 1, the third optical mirror is attached with at least one secondary mirror on the side close to the main reflector, and the secondary mirror is an optical lens for image adjustment .

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