CN2906680Y

CN2906680Y - Automatic focusing device for mobile phone camera

Info

Publication number: CN2906680Y
Application number: CN200620026056.5U
Authority: CN
Inventors: 宋建静; 孟婕
Original assignee: Tianjin Samsung Electro Mechanics Co Ltd
Current assignee: Tianjin Samsung Electro Mechanics Co Ltd
Priority date: 2006-05-16
Filing date: 2006-05-16
Publication date: 2007-05-30
Anticipated expiration: 2016-05-16

Abstract

The utility model belongs to a mobile telephone taking lens, in particular to an automatically focusing mechanism for taking lens of the mobile telephone adopting a piezo-electric annular ultrasonic motor, comprising an inner cylinder cap, an inner cylinder and an outer cylinder which are provided with a set of lens, and a drive motor positioned inside a machine base. The utility model is characterized in that the two sides of the inner cylinder are provided symmetrically with a boss; the two bosses are respectively provided with a plurality of rack holes; the boss at an end is provided with a screw hole with an internal thread; the screw hole is connected with the screw by means of threads; the lower end of the screw is fixed with a gear which is engaged with the gear of the drive motor rotor; the two ends of the outer cylinder are provided with a rack correspondingly with the holes of the track of the boss. The utility model has the advantages that the application of the piezo-electric annular ultrasonic motor favors the improvement of the rotation rate of the motor and the output of the greater moment, and can suit the application of the mobile telephone.

Description

The automatic focusing mechanism of cell-phone camera camera lens

Technical field

The utility model belongs to a kind of cell-phone camera camera lens, relates in particular to a kind of automatic focusing mechanism that adopts the cell-phone camera camera lens of piezoelectricity ring-type ultrasonic motor.

Background technology

What mobile phone cam adopted mostly in the prior art is the common optical lens that focuses, owing to can not focus automatically, draws a portrait second-rate.The camera that some is advanced though adopted Autofocus Technology, all is that volume is big, and precision is low, and noise is arranged.The drive unit of mobile phone cam optical lens comprises inner core and the urceolus that is provided with lens combination, realizes relatively moving by the circuit accessory drive between inner core and the urceolus, has promptly realized automatic focusing process.Drive unit has multiple mode: electromagnetic induction machines, electrostatic motor and supersonic motor etc.The electromagnetic induction machines rotating speed is fast, moment is big, power is high, but owing to adopted solenoid and tooth shaft transmission, so the heating loss is big, is difficult for microminiaturization, is difficult to design the very little optical lens for cell phone of structural volume.Electrostatic motor directly utilizes electrostatic force to drive rotor, does not need solenoid, and is Miniaturized, but moment is less, and friction and noise between stator and rotor are bigger, often needs motor is immersed in the fluid to turn round, and is unsuitable for being used in mobile phone cam.Mobile phone manufacturer demands urgently developing and adopts the ultrasonic motor with characteristics such as volume are little, moment is big, rotating speed is fast to be used for the requirement that the mobile phone microminiaturization is satisfied in the automatic focusing of pick-up lens.

The utility model content

The purpose of this utility model is to provide a kind of can adapt to microminiaturized mobile phone application, adopts the automatic focusing mechanism of the cell-phone camera camera lens of piezoelectricity ring-type ultrasonic motor.

The utility model for achieving the above object, by the following technical solutions: a kind of automatic focusing mechanism of cell-phone camera camera lens, comprise inner core cap, inner core, the urceolus that is provided with lens combination and place the interior CD-ROM drive motor of support, it is characterized in that: described inner core symmetria bilateralis is provided with boss, be respectively equipped with guide rail hole on two boss, one end boss is provided with tapped screw hole, screw hole and screw rod are spirally connected, the screw rod lower end be connected with gear and with the gearing mesh of CD-ROM drive motor rotor, corresponding boss upper rail hole, described urceolus two ends is provided with guide rail.

Described screw rod lower end is equipped with preloading spring.

Described CD-ROM drive motor is a piezoelectricity ring-type ultrasonic motor.

The beneficial effects of the utility model: adopt piezoelectricity ring-type ultrasonic motor, help improving the rotating speed and the bigger moment of output of motor, can adapt to microminiaturized mobile phone and use.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the structural representation of motor among Fig. 1;

Fig. 4 is bar-shaped ceramic electrode distribution schematic diagram.

Embodiment

As shown in the figure, a kind of automatic focusing mechanism that adopts the cell-phone camera camera lens of piezoelectricity ring-type ultrasonic motor, comprise inner core cap 5, inner core 1, the urceolus 3 that is provided with lens combination and place CD-ROM drive motor 12 in the support 4, described CD-ROM drive motor is a piezoelectricity ring-type ultrasonic motor.Described inner core symmetria bilateralis is provided with boss 8, be respectively equipped with guide rail hole 14-1,14-2 on two boss, one end boss is provided with tapped screw hole 13, screw hole 13 is spirally connected with screw rod 7, the screw rod lower end be connected with gear 11 and with the gear 12-1 of CD-ROM drive motor rotor engagement, corresponding boss upper rail hole, described urceolus two ends is provided with guide rail 2,6, and described screw rod lower end is equipped with preloading spring 9, can eliminate the screw axial play.

Install and the course of work: inner core is connected with the inner core cap by screw thread, and rotation inner core cap is adjusted the distance of lens combination and imageing sensor, adjusts back point glue, fixedly inner core cap.Inner core can only move up and down along two guide rails that are fixed on the urceolus.When motor rotor rotates, drive the screw rod rotation, during the screw rod that is connected with inner core rotation, because inner core is by the control of the guide rail on the urceolus, so inner core generation upper and lower displacement, reach the purpose of automatic focusing.

Motor is a piezoelectricity ring-type ultrasonic motor, and as Fig. 3,15 is preloading spring, to change the pretightning force between stator and the rotor.16 is rotor, and 17 is elastic body, and 18 is piezoelectric ceramics (stator), and 19 is support plate, and 20 is bearing.Fig. 4 is the branch electrode structure of 18 piezoelectric ceramics (stator), "+", "-" expression polarised direction, the ring piezoelectric potsherd of stator is divided into A, B two-phase region after cutting apart polarization by certain rule, adjacent two-stage spatial disposition differs pi/2 (1/4 wavelength), and is subjected to also differing in time the excitation (E1 and E2) of the high frequency electric source of pi/2 respectively.When the frequency of excitation power supply equals the natural frequency of stator, stator produces resonance, and the phase of wave stack that two interval piezoelectric ceramics are excited produces synthetic refracted traveling wave along the circumferential direction in motor stator, the rotation of promotion rotor, rotation direction is opposite with the row direction of wave travel.If change the symbol of the excitation power supply voltage that applies, can make the rotor counter-rotating, very convenient.Excitation power supply can be sine wave or square wave.

The above only is preferred embodiment of the present utility model, is not structure of the present utility model is done any pro forma restriction.Every foundation technical spirit of the present utility model all still belongs in the scope of the technical solution of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims

1, a kind of automatic focusing mechanism of cell-phone camera camera lens, comprise inner core cap, inner core, the urceolus that is provided with lens combination and place the interior CD-ROM drive motor of support, it is characterized in that: described inner core symmetria bilateralis is provided with boss, be respectively equipped with guide rail hole on two boss, one end boss is provided with tapped screw hole, screw hole and screw rod are spirally connected, the screw rod lower end be connected with gear and with the gearing mesh of CD-ROM drive motor rotor, corresponding boss upper rail hole, described urceolus two ends is provided with guide rail.

2, the automatic focusing mechanism of cell-phone camera camera lens according to claim 1 is characterized in that: described screw rod lower end is equipped with preloading spring.

3, the automatic focusing mechanism of cell-phone camera camera lens according to claim 1 is characterized in that: described CD-ROM drive motor is a piezoelectricity ring-type ultrasonic motor.