CN103095976B - The MEMS camera of MEMS camera iris control apparatus and application thereof - Google Patents

Abstract

The invention provides an aperture control device for a MEMS camera head. The MEMS camera head includes a MEMS motor assembly and a lens. The lens is configured with an aperture. The aperture control device includes an aperture control member that is arranged between the MEMS motor assembly and the lens. Among them, MEMS is a micro-electromechanical system. In the design of MEMS devices, most of its microstructures are configured correspondingly to related components. In MEMS cameras, the MEMS motor components and apertures are in a fixed corresponding configuration, so that the aperture can only obtain a fixed size. A single incident light will undoubtedly affect the focus imaging, and the aperture control part in this case can control the size of the incident light entering the aperture according to the demand, thereby improving the imaging effect, and effectively avoiding the problem caused by the incident light Therefore, the MEMS device needs to be redesigned, which reduces the cost budget. The invention also provides a MEMS camera.

Description

MEMS camera aperture control device and MEMS camera applied thereto

technical field

The invention relates to the technical field of cameras, in particular to an aperture control device of a MEMS camera and a MEMS camera equipped with the aperture control device.

Background technique

At present, micro-electromechanical systems (MEMS) are used for camera focusing, which is an emerging technology in the field of camera technology. For the design of the aperture, its size is fixed after the MEMS is designed, so its aperture can only obtain fixed incident light, as shown in Figure 1 of the specification, in this figure, the MENS motor assembly 20 is connected with the lens 40 , wherein the MEMS motor assembly is provided with a first opening 21, and the lens 40 is provided with a second opening 41, and the aperture is installed in the second opening 41. When taking a picture, the incident light passes through the first opening 21, the second opening The hole 41 shoots to the aperture, and the amount of light passing through it cannot be changed according to the demand, resulting in a single focus imaging, which affects the shooting effect. Then, if you need to obtain different incident light, according to the general design, you must change the design of MEMS, which brings a problem, because MEMS production mainly uses wafer technology, and its design will take half a year at the fastest, and material preparation The cycle is long and the flexibility is extremely poor, which undoubtedly affects the progress of the product launch. In addition, the redesign of MEMS also increases the cost budget of the enterprise.

Therefore, it is necessary to provide a technical means to solve the above defects.

Contents of the invention

The object of the present invention is to provide an aperture control device for a MEMS camera and the MEMS camera applied thereto, so as to solve the problem that the aperture in the MEMS camera in the prior art can only obtain fixed incident light.

For reaching this purpose, the present invention adopts following technical scheme:

An aperture control device for a MEMS camera, the MEMS camera includes a MEMS motor assembly and a lens, the lens is configured with an aperture, and the aperture control device includes an aperture control member for controlling the size of incident light entering the aperture, The aperture control part is arranged between the MEMS motor assembly and the lens.

As a further preferred solution, the MEMS motor assembly is provided with a first opening for incident light to pass through, the lens is provided with a second opening for incident light to pass through, and the aperture is installed on the second opening, The aperture control member is provided with a third opening corresponding to the first opening and the second opening;

Preferably, the center of the first hole, the center of the second hole and the center of the third hole are arranged on the same axis;

Preferably, the aperture control member is a sheet, and the third opening is opened at the center of the sheet;

Preferably, the sheet is made of black plastic or black metal.

A kind of MEMS camera, comprises MEMS motor assembly, lens, fixture, sensor and circuit board, described lens is fixed on described fixture, and described circuit board is electrically connected with described MEMS motor assembly, described sensor respectively, and described The above-mentioned aperture control device is arranged between the MEMS motor assembly and the lens.

As a further preferred solution, the sensor is a CCD sensor or a CMOS sensor.

As a further preferred solution, an infrared filter is arranged on the fixing member.

As a further preferred solution, the circuit board is a flexible circuit board.

As a further preferred solution, the MEMS camera further includes a shielding cover, and the shielding cover sequentially covers the MEMS motor assembly, the lens, the fixing member, the sensor and the circuit board.

The beneficial effect of the present invention is: wherein, MEMS is micro-electro-mechanical system, and in MEMS device design, its microstructure is mostly configured correspondingly with relevant parts, so in MEMS camera head, MEMS motor assembly and aperture are fixed corresponding configurations, make The aperture can only obtain a fixed size of incident light, a single incident light will undoubtedly affect the focus imaging, and the aperture control part in this case can control the size of the incident light entering the aperture according to the demand, thereby improving the imaging effect, and also It effectively avoids the need to redesign the MEMS device due to the incident light, and reduces the cost budget.

Description of drawings

Fig. 1 is an exploded view of a prior art MEMS camera, to demonstrate the structural relationship between the MEMS motor assembly and the lens;

Fig. 2 is the perspective view of MEMS camera head of the present invention, to show its internal structure;

FIG. 3 is an exploded view of FIG. 1 to show the structure in which the aperture control device is installed between the MEMS motor assembly and the lens;

Fig. 4 is a schematic diagram of the aperture control device of the MEMS camera of the present invention.

In the picture:

10. MEMS camera; 20. MEMS motor assembly; 21. First opening; 30. Aperture control device; 31. Aperture control member; 32. Third opening; 40. Lens; 41. Second opening; 50. Fixing piece; 60, infrared filter; 70, sensor; 80, circuit board; 90, shielding cover.

detailed description

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

Referring to Fig. 3, the present invention provides an aperture control device 30 for a MEMS camera. The MEMS camera includes a MEMS motor assembly 20 and a lens 40, and the lens 40 is configured with an aperture. The imaging device usually consists of several lenses. In addition, the lens 40 has two more important parameters: aperture and focal length. The aperture is a device installed on the lens 40 to control the amount of light passing through the lens 40 and reaching the sensor 70. In addition to controlling the amount of light passing through, the aperture also has the function of controlling the depth of field. The larger the aperture, the smaller the depth of field. Usually, when taking portraits, the background haze effect is A manifestation of small depth of field. The aperture control device 30 includes an aperture control member 31 for controlling the magnitude of incident light entering the aperture. The aperture control member 31 is disposed between the MEMS motor assembly 20 and the lens 40 . In the design of MEMS devices, most of its microstructures are configured correspondingly to related components, so in the MEMS camera, the MEMS motor assembly 20 and the aperture are in a fixed corresponding configuration, so that the aperture can only obtain incident light of a fixed size, and a single incident light Undoubtedly affect the focus imaging, and the aperture control part 31 in this case can control the size of the incident light entering the aperture according to the demand, thereby improving the imaging effect, and effectively avoiding the need to redesign the MEMS device due to the incident light , reducing the cost budget.

Among them, MEMS is a micro-electromechanical system. MEMS is the name of the United States. It is called micromachines in Japan and microsystems in Europe. As well as signal processing and control circuits, until the interface, communication and power supply are integrated micro-devices or systems. Micro-Electro-Mechanical Systems MEMS (Micro-Electro-MechanicalSystems) is a brand-new technology that must simultaneously consider the research and development field of the mixing of multiple physical fields. Compared with traditional machinery, their size is smaller, and the largest does not exceed one centimeter. , and even only a few microns, the thickness is even smaller. A complete MEMS is an integrated micro-device system composed of micro-sensors, micro-actuators, signal processing and control circuits, communication interfaces, and power supplies. The multi-functional micro-system is integrated in the large-scale system, thereby greatly improving the automation, intelligence and reliability of the system.

Specifically, the MEMS motor assembly 20 is provided with a first opening 21 for incident light to pass through, the lens 40 is provided with a second opening 41 for incident light to pass through, the aperture is installed on the second opening 41, and the aperture control member 31 is provided with The third opening 32 correspondingly communicated with the first opening 21 and the second opening 41, wherein the opening of the third opening 32 can be provided with apertures of different sizes according to actual needs, so that the aperture can obtain the required Amount of light. Preferably, the center of the first opening 21, the center of the second opening 41 and the center of the third opening 32 are arranged on the same axis, specifically, the MEMS motor assembly 20, the aperture control member 31 and the lens 40 There is a concentricity between them to further ensure the amount of light passing through and avoid a large deviation between the actual incident light entering the aperture and the theoretical value.

Please refer to Fig. 4, as a preferred embodiment of this case, the aperture control member 31 is a sheet 31, and the third opening 32 is opened at the center of the sheet 31. By using the sheet 31, it is not only convenient for it to be installed on the MEMS motor assembly 20 and lens 40, but also convenient for production and processing. In addition, the sheet 31 is made of black plastic or black metal. Among them, any object will absorb light, but their ability to absorb light is different, strong or weak. White light is composed of 7 kinds of visible light. Different objects have different absorption and reflection conditions for these 7 kinds of visible light. Generally, black objects have strong ability to absorb light and weak ability to reflect light. 31 is made of black plastic or black metal, which can better weaken the incident light that needs to be isolated and ensure the focus imaging of the camera.

Please refer to Fig. 2 and shown in Fig. 3, the present invention also provides a kind of MEMS camera 10, comprise MEMS motor assembly 20, camera lens 40, fixture 50, sensor 70 and circuit board 80, lens 40 is fixed on fixture 50, circuit board 80 is electrically connected to the MEMS motor assembly 20 and the sensor 70 respectively, and the above-mentioned aperture control device 30 is provided between the MEMS motor assembly 20 and the lens 40 .

Specifically, the sensor 70 is a CCD sensor or a CMOS sensor. The sensor 70 is the core of the camera and also the most critical technology. It is a device for receiving light passing through the lens and converting these light signals into electrical signals. The CCD sensor and CMOS sensor are common camera sensors. The difference between the two is that the advantage of CCD is that the image quality is good, but due to the complicated manufacturing process, only a few manufacturers can master it, so the manufacturing cost remains high, especially for large CCDs. , the price is very high. At the same resolution, CMOS is cheaper than CCD, but the image quality produced by CMOS devices is lower than that of CCD. Compared with CCD sensors, one of the advantages of CMOS image sensors is that the power consumption is lower than that of CCDs. CCDs provide excellent image quality at the cost of higher power consumption. In order to ensure smooth charge transmission and reduce noise, it is necessary to High differential pressure improves transmission. However, the CMOS image sensor converts the charge of each pixel into a voltage, amplifies it before reading, and can be driven by a 3.3V power supply, and the power consumption is lower than that of a CCD.

Specifically, an infrared filter 60 is disposed on the fixing member 50 . The function of the infrared filter 60 is to block and filter visible light while allowing infrared rays to pass through according to the wavelength specification of the lens. If the infrared filter 60 is used, the infrared effect can be separated in the mixed light environment of visible light/infrared rays. In this way, the effect of the infrared filter 60 applied in the MEMS camera 10 can be understood as: there are a large amount of infrared rays in daylight, However, the coexistence of visible light interferes with infrared shooting and makes the picture overexposed and white, so it is necessary to add an infrared filter 10 to filter visible light to obtain a pure infrared effect.

Specifically, the circuit board 80 is a flexible circuit board. The circuit board 80 is divided into three types: hard board, soft board, and soft-rigid board. Of course, this case can also choose a soft-hard board, but its cost is relatively high, which is not conducive to the cost budget of the enterprise.

Specifically, the MEMS camera 10 further includes a shielding cover 90 , and the shielding cover 90 sequentially covers the MEMS motor assembly 20 , the lens 40 , the fixing member 50 , the sensor 70 and the circuit board 80 . Among them, the principle of the mobile phone shield 90: use the shield to surround the interference source of components, circuits, assemblies, cables or the entire system to prevent the interference electromagnetic field from spreading outward; use the shield to surround the receiving circuit, equipment or system , to prevent them from being affected by external electromagnetic fields. The material of the shielding case 90 is generally 0.2mm thick stainless steel and nickel nickel. The flatness of the mobile phone metal shield 10 is strictly controlled within a tolerance range of 0.05mm to ensure its easy tinning performance and excellent shielding effect.

The working principle of the aperture control device 30 of the MEMS camera of the present invention will be further described below with reference to the figures.

First, prepare a black sheet 31, process it into a rectangle by a laser cutting machine or other cutting machines, and open a third opening 32 at its central position, the aperture of the third opening 32 is mainly based on the passage of the required incident light. The amount of light is opened, and after the completion, the sheet 31 is installed between the MEMS motor assembly 20 and the lens 40, and at the same time, the hole center of the first opening 21 of the MEMS motor assembly 20 and the hole of the second opening 41 of the lens 40 are guaranteed. The center is on the same axis as the center of the third opening 32. At this time, when the incident light passes through the third opening 32, its original clearance amount can be changed. Specifically, the incident light enters the third opening from the first opening 21. When opening the hole 32, the required incident light will pass through the second opening 41 to the aperture according to its regulations, and the incident light that is removed will be irradiated to the black surface of the sheet 31, and the light absorption function of the black will cause the black surface of this part to The incoming light is weakened and disappears outside the lens.

The above describes the technical principles of the present invention in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention, and cannot be construed as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation modes of the present invention without creative work, and these modes will all fall within the protection scope of the present invention.

Claims (8)

1. A diaphragm control device for a MEMS camera head, the MEMS camera head includes a MEMS motor assembly and a lens, and the lens is configured with a diaphragm, and it is characterized in that the diaphragm control device includes a device for controlling the incident light entering the diaphragm a large and small aperture control member, the aperture control member is disposed between the MEMS motor assembly and the lens; Wherein, the MEMS motor assembly is provided with a first opening for incident light to pass through, the lens is provided with a second opening for incident light to pass through, the aperture is installed on the second opening, and the aperture controls The component is provided with a third opening corresponding to the first opening and the second opening, and the aperture size of the third opening is determined according to the actual demand, wherein the actual demand refers to the required incident light the amount of light; The center of the first hole, the center of the second hole and the center of the third hole are arranged on the same axis. 2 . The aperture control device for a MEMS camera according to claim 1 , wherein the aperture control member is a sheet, and the third opening is opened at the center of the sheet. 3 . 3. The aperture control device of the MEMS camera according to claim 2, wherein the sheet is made of black plastic material or black metal material. 4. A kind of MEMS camera head, comprise MEMS motor assembly, lens, fixture, sensor and circuit board, described camera lens is fixed on described fixture, and described circuit board is electrically connected with described MEMS motor assembly, described sensor respectively, It is characterized in that the aperture control device according to any one of claims 1 to 3 is provided between the MEMS motor assembly and the lens. 5. The MEMS camera according to claim 4, wherein the sensor is a CCD sensor or a CMOS sensor. 6. The MEMS camera according to claim 4, wherein an infrared filter is disposed on the fixing member. 7. The MEMS camera according to claim 4, wherein the circuit board is a flexible circuit board. 8. The MEMS camera according to any one of claims 4 to 7, wherein the MEMS camera further comprises a shielding cover, and the shielding cover sequentially covers the MEMS motor assembly, the lens, and the fixing member , the sensor and the circuit board.