CN201054034Y - Automatic focusing lens module - Google Patents

Abstract

The utility model relates to an automatic focusing lens module, which is used for driving a lens to move forwards/backwards by means of the cooperation of electromagnetic force and spring force to focus, and comprises a rectangular bottom cover, two conducting strips, an insulating strip, four magnets, a lens sleeve, a lens, a coil spring, a coil and a rectangular upper cover, wherein the lens sleeve, the lens and the coil form a lens set capable of being synchronously linked, the coil spring is sleeved between the coil and the lens and elastically supported between the annular groove of the lens sleeve and the upper cover, the four magnets are equidistantly and symmetrically arranged on the periphery of the coil and positioned at four inner corners of the rectangular bottom cover, the structure and volume of the module are simplified and reduced, the distance between the coil and the magnet is reduced to improve the electromagnetic effect generated between the coil and the magnet, and the circular diameter of the coil spring is reduced to improve the balance and stability of the coil spring.

Description

Auto Focus Lens Module

technical field

The utility model relates to an automatic focusing lens module, in particular to a lens module for focusing by controlling the forward/backward movement of the lens by means of electromagnetic force and spring force.

Background technique

There is a lens module on a digital camera or a mobile phone with a shooting function, and the lens module includes a stepless or two-stage autofocus type of far and near focus; another lens module must basically meet the light, thin, short Requirements, and must have precision and durability; however, the structure of the existing lens module is still relatively complex, the volume is relatively large, which is not conducive to miniaturization; and the existing ones use shrapnel and electromagnetic force to form a balanced state, but The shrapnel is easily deformed by external force, including vibration, homing (falling back to the original position) or after long-term use, so as to affect the stability and accuracy of lens movement; and the applicant of this case once applied for utility model No. New Model No. 200520144136.6 and Utility Model No. 200620113888.0 and many other domestic and foreign related patents, among which the structure of utility model No. 200620113888.0 is that the coil is set between the lens and the coil spring, that is, the coil spring is on the periphery of the coil , the distance between the coil and the magnet is relatively large and the electromagnetic effect (electromagnetic force) generated between the two is relatively reduced; and the coil spring is set on the periphery of the coil, so that the diameter of the coil spring is relatively large, which affects the coil spring. The balance and stability of the spring; it can be seen from the above that there is still room for further improvement in the design of the lens module.

Contents of the invention

The main purpose of the utility model is to provide an autofocus lens module, which is composed of a rectangular bottom cover, two conductive sheets, an insulating sheet, four magnets, a lens sleeve, a lens, a coil spring, a coil, and It consists of a rectangular upper cover, and the lens sleeve, lens and coil constitute a lens group that can move synchronously, and the coil spring is an annular ring that is sleeved between the lens and the coil and elastically supported on the lens sleeve. Between the groove and the upper cover, the four magnets are arranged equidistantly and symmetrically on the periphery of the coil and at the four inner corners of a rectangular bottom cover, so as to simplify and reduce the structure and volume of the module, and reduce the size of the coil and the magnet. The distance between them is to increase the electromagnetic effect generated between them, and the diameter of the coil spring is reduced to improve the stability of the spring force.

In order to achieve the above object, the technical solution adopted by the utility model is to provide an autofocus lens module, which includes a bottom cover, two conductive sheets, an insulating sheet, four magnets, a lens sleeve, a lens, and a coil spring , a coil and a cover, wherein:

The bottom cover is a rectangular frame body, and its four corners are provided with four brackets for fastening. There are several positioning pins;

The conductive sheets are respectively matched with the positioning pins of the bottom cover through the positioning holes to be fixed on the bottom cover and form an electrically isolated state, and a central hole is formed between the two conductive sheets, which is connected to the central hole of the bottom cover. Corresponding;

An insulating sheet, on which a positioning hole is set to correspond to the positioning pin of the bottom cover, so that it is attached to the two conductive sheets, and a central hole is set on it;

The magnets are symmetrical and slightly arc-shaped magnets, which are respectively placed on the inside of the four brackets of the bottom cover;

The lens sleeve is a torus with a central hole, an annular groove and an annular outer flange located on the periphery of the annular groove;

The lens is fixed in the central hole of the lens sleeve;

The coil spring is set on the periphery of the lens and on the annular groove of the lens sleeve, so that it is elastically supported between the annular groove and the inner edge surface of the upper cover;

The coil is set on the periphery of the coil spring and fixed on the ring-shaped outer flange of the lens sleeve, and its head and tail end wires are respectively connected to different electrodes of the two conductive sheets;

The upper cover is set on the bottom cover and buckled into one;

Through the above structure, the lens sleeve, the lens, and the coil form a lens group that can move synchronously, and the electromagnetic action between the coil and the magnet is used to drive the lens group to move axially, and the lens is driven by the restoring force of the coil spring. The group moves axially.

Description of drawings

Fig. 1 is a perspective view of an embodiment of the utility model;

Fig. 2 is a three-dimensional exploded view of Fig. 1;

Fig. 3 is a side sectional view of Fig. 1;

Fig. 4-Fig. 10 are schematic diagrams of the continuous combination relationship among the various components of the present invention.

Description of reference signs: 1-lens module; 2-lens group; 10-bottom cover; 11-bracket; 12-central hole; 13-locating pin; 14 protrusion; 20-conductive sheet; Lug; 23-central hole; 30-insulation sheet; 31-positioning hole; 32-central hole; 40-magnet; 50-lens sleeve; 51-central hole; 52-groove; 53-outer flange; 60 -lens; 70-coil spring 80-coil 90-top cover; 91-truncated end.

Detailed ways

In order to make the utility model more definite and detailed, hereby coordinate the following preferred embodiment diagram to describe in detail as follows:

Referring to Figures 1-3, the lens module 1 of the present invention includes a rectangular bottom cover (base) 10, two conductive sheets (copperplate) 20, an insulation sheet (insulation spacer) 30, four magnets 40, and a lens holder (lensholder) 50, a lens 60, a coil spring (coiledspring) 70, a coil 80, and a rectangular top cover (topcover) 90, wherein the lens sleeve 50, the lens 60, and the coil 80 form a synchronously movable As shown in FIG. 2 , the lens group 2 can move forward/backward (up/down) between the bottom cover 10 and the top cover 90 to achieve focusing.

Please refer to Fig. 4-Fig. 10 again, which is a schematic diagram of the continuous combination relationship between the components of the present utility model, wherein, as shown in Fig. 4, the bottom cover 10 is a rectangular frame body, and its four corners are provided with four brackets for fastening 11 is combined with the upper cover 90, and a central hole 12 is provided at the center to form the optical path of the lens 60, and several positioning pins 13 and protrusions 14 for the partition are respectively provided on the inner surface.

As shown in Figure 5, the two conductive strips 20 are respectively matched with the positioning pins 13 by means of their positioning holes 21 to be fixed on the bottom cover 10 and form an electrically isolated state, and each is connected to different electrodes by means of a protruding piece 22 and a central hole 23 is formed between the two conductive sheets 20 to correspond to the central hole 12 of the bottom cover 10 .

As shown in FIG. 6 , the insulating sheet 30 is attached to the two conductive sheets 20 by virtue of its positioning hole 31 cooperating with the positioning pin 13 , and it has a central hole 32 corresponding to the central holes 12 and 23 .

As shown in Figure 7 again, the four magnets 40 are symmetrically shaped and slightly arc-shaped, and are respectively erected on the inside of the four brackets 11 of the rectangular bottom cover 10, and can be positioned by virtue of the inner edge surface of the upper cover 90; and the four magnets 40 can also be placed on the inner edges of the four corners of the upper cover 90 respectively and fixed to facilitate the assembly operation.

As shown in Fig. 8-Fig. 10 again, wherein the assembly order among components such as lens sleeve 50, lens 60, coil spring 70 and coil 80 is not limited; Lens sleeve 50 is a torus, is provided with a central hole 51 1. An annular groove 52 and an annular outer flange 53; the lens 60 is locked in the central hole 51 of the lens sleeve 50 (as shown in Figure 3), the locking method is not limited, it can be screwed or adhesion method; the coil spring 70 is sleeved between the lens 60 and the coil 80, and its two ends are respectively supported between the annular groove 52 of the lens sleeve 50 and the inner edge surface of the upper cover 90; the coil 80 is a sleeve It is located on the annular outer flange 53 of the lens sleeve 50, and is located at the periphery of the coil spring 70; the coil 80 and the lens sleeve 50 can be fixed by means of adhesion, so that the lens sleeve 50, the lens 60 and the coil 80 A synchronously movable lens group 2 is formed as shown in FIG. 2; and the lens group 2 is arranged on the insulating sheet 30, so that the lens 60 and each central hole 12, 23, 32 are on the same central axis.

As shown in Figure 1 again, the upper cover 90 is a housing designed to match the bottom cover 10, and its four corners are provided with truncated ends 91, so that the upper cover 90 can be sleeved between the four brackets 11 of the bottom cover 10 and buckled. Combined into one body, a lens module 1 is assembled to complete, and the four magnets 40 are clamped between the inner edge surface of the upper cover 90 and the insulating sheet 30 without displacement.

The coil spring 70 can be a compressed coil spring, and when the upper cover 90 and the bottom cover 10 are combined, the coil spring 70 can be in an appropriate compressed state, and press the lens sleeve 50 relatively downward to make the lens Group 2 is placed at the rear (lower) dead center position in its telescopic stroke, and forms the far-focus position; The head and tail end of the coil 80 can change different electrodes and current sizes to match the N and S poles of the magnet 40 And generate forward/backward (up/down) electromagnetic force to drive lens group 2 to move forward/backward (up/down) to carry out focusing action; The generation method of force can be selected to only generate forward (upward) electromagnetic force, so that when in the far focus position, the coil 80 can not pass current, so that the lens group 2 is not affected by the electromagnetic force and stays at the rear (lower) dead center position (far focus position); when the focus action is desired, an appropriate amount of current is controlled to pass through the coil 80 to generate an appropriate amount of electromagnetic force to drive the lens group 2 to move forward (upward) to form a near-focus state, and when the lens group 2 goes up When the electromagnetic force and the compression force of the coil spring 70 are balanced, the lens group 2 stays in the adjusted position. Therefore, the lens group 2 must rely on the electromagnetic force to move forward (up) from the far focus to the near focus position. Returning backward (down) from the near focus position to the far focus position can rely on the restoring force of the coil spring 70 to achieve the far and near focus adjustment function. Furthermore, the circuit design can be used to enable the lens group 2 to achieve a non-segmented or only two-segment auto-focus mode of far and near focus.

The lens module 1 of the utility model is compared with the existing lens module. The utility model only utilizes a coil spring 70 to be sleeved on the annular groove 52 of the lens sleeve 50, and four magnets 40 are respectively placed on the rectangular bottom cover 10. The inner side of the four brackets 11, so the structure is simplified and the volume is reduced, which is conducive to reducing the lens module 1; especially the coil spring 70 is sleeved on the annular groove 52 between the inner circumference of the coil 80 and the outer circumference of the lens 60, so that the coil 80 is positioned on the coil The periphery of the spring 70 relatively narrows the distance between the coil 80 and the four magnets 40, thereby increasing the electromagnetic interaction between the coil 80 and the magnet 40; balance and stability.

What is shown above is only a preferred embodiment of the present invention, and is only illustrative, not restrictive, of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalent changes can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims (4)

1. autofocus lens module, it is characterized in that: it comprises a bottom, two conducting strips, an insulating trip, four magnet, a lens sleeve, a camera lens, a coil spring, a coil and a loam cake, wherein:

Bottom is a rectangle frame support body, and its four jiaos places are provided with to fasten and use four supports, and itself and described loam cake are buckled into one, and its centre is provided with a medium pore, and it forms the optical path of camera lens, and its place, inner face diagonal angle is provided with several register pins;

Conducting strip is to cooperate with the register pin of bottom by pilot hole respectively, to be installed on the bottom and to form the electrical isolation state, forms a medium pore again between two conducting strips, and its medium pore with described bottom is corresponding;

Insulating trip is established the register pin of pilot hole with the described bottom of corresponding matching on it, it is sticked on two conducting strips, establishes a medium pore again on it;

Magnet, for symmetric shape and slightly be the magnet of circular arc, vertically-arranged is in the inboard of four supports of bottom respectively;

Lens sleeve is a torus, is provided with the periphery that a medium pore, an annular recess and a ring-type outward flange are located at annular recess;

Camera lens is to be installed in the medium pore of lens sleeve;

Coil spring is to be set in the peripheral of camera lens and to be located on the annular recess of lens sleeve, makes its resiliency supported between described annular recess and loam cake inner edge surface;

Coil is to be set in the peripheral of coil spring and to be fixed on the ring-type outward flange of lens sleeve, its, the tail end lead is the different electrodes that are connected to described two conducting strips respectively;

Loam cake is to be set on the bottom and to be buckled into one;

By said structure, make lens sleeve, camera lens, forming one with coil can synchronization-moving lens group, and utilize the two electromagnetic action of coil and magnet to move axially, and lens group is moved axially by the restoring force of coil spring with the driving lens group.

2. according to the described autofocus lens module of claim 1, it is characterized in that: described camera lens is fixed in the medium pore of lens sleeve by screw-in version or adhesive means.

3. according to the described autofocus lens module of claim 1, it is characterized in that: described coil is fixed on the ring-type outward flange of lens sleeve by adhesive means.

4. according to the described autofocus lens module of claim 1, it is characterized in that: four jiaos of places of described loam cake are provided with four supports of rescinded angle end with the corresponding matching bottom.

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