CN100438573C - Small-sized camera module - Google Patents

Abstract

The present invention discloses a structure of a small photographic module, which comprises: a base, provided with a linear cam outer cylinder, the linear cam outer cylinder also having a linear cam track perpendicular to the base; a linear inner cylinder, in which a photographic lens is installed, and a sliding block is provided on the outer wall, the linear inner cylinder is sleeved in the linear cam outer cylinder, and the sliding block can slide in the linear cam track; a rotating cam, the cylinder has a rotating cam track gradually inclined upward along its cylinder wall, the rotating cam cylinder is sleeved outside the linear cam outer cylinder, and the sliding block can slide in the rotating cam track; a coil, fixed to the outer wall of the rotating cam cylinder; a torsion spring, surrounding the outer wall of the rotating cam cylinder, one end of the torsion spring is fixed to the base, and the other end is fixed to the outer wall of the rotating cam cylinder and is electrically connected to the coil; a magnetic circuit component, sleeved on the base and surrounding the coil and providing a magnetic field.

Description

small camera module

technical field

The invention relates to a compact camera module, in particular to a compact camera module driven by a voice coil motor.

Background technique

In recent years, various portable electronic devices have the function of taking pictures, such as mobile phones, personal digital assistants, etc., generally have the function of taking pictures. These electronic devices with a camera function all need to be equipped with a compact camera module to perform the above-mentioned camera function.

The small camera module, like the general camera lens module, needs a power source to drive the lens to move and focus, so as to perform the camera function. If the existing small camera module uses a voice coil motor as the power source to drive the lens to move, it needs to use a leaf spring or a metal wire as a guiding or returning device. When the portable electronic device is impacted (such as dropped to the ground), the above-mentioned guiding or returning mechanism, which only consists of leaf springs or metal wires, has the disadvantages of being not resistant to impacts and the camera lens is easily tilted.

Contents of the invention

The technical problem to be solved by the present invention is to provide a small camera module to overcome the shortcomings of the existing small camera modules that are not resistant to impact and the camera lens is easy to tilt.

To achieve the above object, the present invention provides a small camera module with the following components, including: a base with a straight cam outer cylinder, and the straight cam outer cylinder has at least one straight cam track perpendicular to the base ; Straight into the inner tube, a photographic lens is installed inside, and at least one sliding block is provided on the outer wall, the straight into the inner tube fits in the straight into the outer cylinder of the cam, and the sliding block can slide in the straight into the cam track; a rotating cam The cylinder has a rotating cam rail that gradually slopes upward along the cylinder wall, and the rotating cam sleeve fits outside the outer cylinder of the straight-in cam, and the sliding block can slide in the rotating cam rail; a coil is fixed on the outer wall of the rotating cam cylinder ; At least one torsion spring surrounds the outer wall of the rotating cam cylinder. One end of the torsion spring is fixed on the base, the other end is fixed on the outer wall of the rotating cam cylinder and electrically connected with the coil; a magnetic circuit component is fitted on the base and surrounds the coil to provide a magnetic field. When the power is supplied by the torsion spring fixed on one end of the base, the magnetic force generated by the coil interacts with the magnetic field of the magnetic circuit components to drive the rotating cam cylinder to rotate, and the rotating cam rail makes it go straight into the inner cylinder. Constrained by the cam track, it rises or falls vertically to the base, and the photographic lens also rises to provide a proper position for performing the focusing function. When the power supply is stopped, the stretched torsion spring provides a restoring force to return the rotating cam track to its original position, and the position of the photographic lens is also adjusted to perform the focusing function. The above-mentioned magnetic circuit components may include a yoke and a permanent magnet, the permanent magnet is arranged inside the yoke, and the position of the coil and the permanent magnet can also be interchanged, so that the permanent magnet is adsorbed on the outer wall of the rotating cam cylinder, and the coil is arranged on the yoke Inside.

As can be seen from the above, the design of the small camera module of the present invention uses a voice coil motor as a power source, uses a rotating cam barrel and a straight cam barrel as a transmission (or guiding) mechanism, and cooperates with a torsion spring as a return device. Therefore, its durability Shock and the camera lens is not easy to tilt.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Figures 1 to 7 are diagrams showing the assembly structure of a small camera module according to a preferred embodiment of the present invention;

FIG. 8 is an exploded view of a small camera module according to a preferred embodiment of the present invention; and

FIG. 9 is an exploded view of a small camera module according to another preferred embodiment of the present invention.

Among them, reference signs:

200: Small photographic module 202: Photographic lens

204: straight into the inner cylinder 204a/204b: sliding block

206: Base 206a/206b: Electrode column

207: Straight into cam outer cylinder 207a: Straight into cam rail

208: rotating cam barrel 208b: bump

208a: Rotary cam track 210: Coil

210a: connecting wire 212: torsion spring

212a/212b: connection end 214: yoke iron

216: permanent magnet 218: upper cover

218a: opening

Detailed ways

As mentioned above, the present invention provides a design of a small camera module, which will be described in detail below in conjunction with preferred embodiments.

As shown in FIG. 7 , it is a perspective view of the appearance of a small camera module according to a preferred embodiment of the present invention. The small camera module 200 can be installed in an electronic device that needs to have a camera function, and provides the function of adjusting the position of the camera lens 202 in order to provide the function of performing focusing. The detailed structure of the small camera module 200 from the inside to the outside will be described below with reference to FIGS. 1 to 7 .

1 to 7 are diagrams showing the assembly structure of a small camera module according to a preferred embodiment of the present invention. FIG. 8 is an exploded view of a small camera module according to a preferred embodiment of the present invention.

As shown in FIG. 1 and FIG. 8 , the photographing lens 202 is fixed inside the straight-in inner tube 204 . There are sliding blocks 204a/204b on the outer wall of the straight inner cylinder 204 .

As shown in FIG. 2 and FIG. 8 , the straight-forward inner cylinder 204 is then fitted into the straight-forward cam outer cylinder 207 on the base 206 , and the sliding blocks 204 a / 204 b can be engaged in two straight-forward cam rails 207 a. The straight-forward cam rail 207a is a bar-shaped notch perpendicular to the base 206 , which restricts the sliding block 204a/204b from rotating, but allows the straight-forward inner cylinder 204 to move up and down perpendicular to the base 206 . Therefore, the photographing lens 202 can also move up and down to provide the function of performing focusing. The base 206 also has two electrode posts 206a/206b, which can be used to provide power.

As shown in FIG. 3 and FIG. 8 , the rotating cam cylinder 208 is then fitted on the straight cam outer cylinder 207 , and the sliding block 204 a (protruding from the straight cam rail 207 a ) is engaged in the rotary cam rail 208 a. The rotating cam cylinder 208 can rotate relative to the straight-forward cam outer cylinder 207 or the straight-forward inner cylinder 204 . Because the rotary cam track 208a is a strip-shaped opening that gradually slopes upward along the wall of the rotary cam cylinder 208, the position of the sliding block 204a can be raised or lowered when the rotary cam cylinder 208 rotates. Because the sliding block 204a is also limited by the straight cam track 207a, the sliding block 204a can only raise or lower its position perpendicular to the base 206, but cannot rotate circularly. The photographing lens 202 and the straight-in inner barrel 204 also move up and down perpendicular to the base 206 at the same time. A coil 210 is also provided on the outer wall of the rotating cam barrel 208 .

As shown in FIG. 4 and FIG. 8 , the torsion spring 212 is then disposed outside the rotating cam barrel 208 around the rotating cam barrel 208 . The connecting end 212a of the torsion spring 212 hooks the electrode post 206a, and the other connecting end 212b is welded to the bump 208b on the outer wall of the rotating cam barrel 208, and is electrically connected to the coil 210 through the connecting wire 210a. FIG. 4 shows two torsion springs, both of which are connected to the base 206 and the rotating cam barrel 208 in the manner described above. In this preferred embodiment, the function of the torsion spring 212 includes the function of providing electrical conductivity in addition to providing the elastic force to restore the rotation of the rotating cam barrel 208 .

As shown in FIG. 5 and FIG. 8 , an annular yoke 214 has a permanent magnet 216 attached to its inner wall.

As shown in FIGS. 6 and 8 , the yoke 214 in FIG. 5 is turned upside down and then covered on the base 206 and outside the coil 210 , exposing the camera lens 202 .

As shown in FIGS. 7 and 8 , the upper cover 218 is finally closed on the base 206 and exposes the camera lens 202 through the opening 218 a.

When the electric power is supplied by the torsion spring 212 fixed on one end 212a of the base 206, the magnetic force generated by the coil 210 will repel the permanent magnet 216, and the rotating cam cylinder 208 will rotate, and the rotating cam rail 208a after the rotation will make it go straight into the inner cylinder. 204 , rise or fall vertically to the base 206 under the restriction of the straight-forward cam track 207 a , and the photographic lens 202 can also be adjusted to a proper position along with the ascending or descending, so that the photographic lens 202 can perform a focusing function.

When the power supply is stopped, the tensioned torsion spring 212 provides the rotating cam rail 208a to return to its original position, and the photographic lens can also provide a proper position to perform the focusing function as it rises or falls.

As shown in FIG. 9 , it is an exploded view of a small camera module according to another preferred embodiment of the present invention. The difference between this preferred embodiment and the embodiment shown in FIG. 8 is that the positions of the coil 210 and the permanent magnet 216 are exchanged. In other words, the permanent magnet 216 in this preferred embodiment is adsorbed on the outer wall of the rotating cam barrel 208 , and the coil 210 is disposed inside the yoke 214 . Therefore, the torsion spring 212 does not need to be electrically connected to the permanent magnet 216 , but the coil 210 disposed in the yoke 214 needs to be electrically connected to the electrode post 206 a to provide the power source required to drive the rotating cam cylinder 208 .

The coil 210 and the permanent magnet 216 in FIGS. 8 and 9 are the main components of the so-called voice coil motor.

It can be seen from the above-mentioned preferred embodiments of the present invention that the application of the small camera module design of the present invention uses a voice coil motor as a power source, a rotating cam barrel and a straight cam barrel as a transmission (or guiding) mechanism, and a torsion spring as a return mechanism. The device can solve the shortcomings of the existing small camera modules that are not impact resistant and the camera lens is easy to tilt.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (9)

1. a small-sized photographic module is characterized in that, comprises at least:

One pedestal has and advances the cam urceolus always, and this directly advances the cam urceolus also has and at least onely directly advance cam track perpendicular to this pedestal;

Advance inner core always, interior installing one phtographic lens, and have at least one sliding shoe on the outer wall, this directly advances inner core and is sleeved on this and directly advances in the cam urceolus, and this sliding shoe passes this and directly advances cam track and can directly advance cam track along this and slide;

One rotating cam tube has a rotating cam rail on its inwall is tilted to gradually, and this rotating cam tube is sleeved on this and directly advances outside the cam urceolus, and this sliding shoe slides along this rotating cam rail;

At least one coil is fixed on the outer wall of this rotating cam tube;

At least one torque spring is surrounded on the outer wall of this rotating cam tube, and an end of this torque spring is fixed on the pedestal, and the other end is fixed in this rotating cam drum outer wall and electrically connects with this coil; And

One magnetic circuit component provides a magnetic field, and this magnetic part is sleeved on this pedestal and around this coil,

When this torque spring is supplied with this coil electric power, this magnetic field reciprocation of the magnetic force that this coil produced and this magnetic circuit component, make this rotating cam tube rotation, postrotational this rotating cam rail drives this and directly advances inner core, directly advance under the restriction of cam track at this and to rise or to descend perpendicular to this pedestal, this phtographic lens also moves to carry out focusing function thereupon

When this electric power stop supplies, this torque spring provides restoring force to make this rotating cam rail be returned to original position.

2. small-sized photographic module according to claim 1 is characterized in that, this directly advances the breach that cam track is a strip.

3. small-sized photographic module according to claim 1 is characterized in that, this rotating cam rail is the perforate of a strip.

4. small-sized photographic module according to claim 1 is characterized in that, also comprises a loam cake, is covered on this pedestal, and exposes this phtographic lens.

5. small-sized photographic module according to claim 1 is characterized in that, this magnetic circuit component comprises a yoke and a permanet magnet, and this permanet magnet is arranged at this yoke inside.

6. a small-sized photographic module is characterized in that, comprises at least:

One pedestal has and advances the cam urceolus always, and this directly advances the cam urceolus also has and at least onely directly advance cam track perpendicular to this pedestal;

Advance inner core always, interior installing one phtographic lens, and have at least one sliding shoe on the outer wall, this directly advances inner core and is sleeved on this and directly advances in the cam urceolus, and this sliding shoe directly advances cam track along this and slides;

One rotating cam tube has a rotating cam rail on its inwall is tilted to gradually, and this rotating cam tube is sleeved on this and directly advances outside the cam urceolus, and this sliding shoe passes this and directly advances cam track and can slide along this rotating cam rail;

At least one permanet magnet is fixed in the outer wall of this rotating cam tube;

At least one torque spring, around the outer wall of this rotating cam tube, an end of this torque spring is fixed on the pedestal, and the other end is fixed in this rotating cam drum outer wall; And

One yoke, in be provided with at least one coil, this yoke is sleeved on this pedestal and around this permanet magnet,

When supplying with this coil one electric power, the magnetic force that this coil produced and this permanet magnet reciprocation, make this rotating cam tube rotation, postrotational this rotating cam rail makes this directly advance inner core, directly advance under the restriction of cam track at this and to rise or to descend perpendicular to this pedestal, this phtographic lens also moves to carry out focusing function thereupon

When this electric power stop supplies, this torque spring provides restoring force to make this rotating cam rail be returned to original position.

7. small-sized photographic module according to claim 6 is characterized in that, this directly advances the breach that cam track is a strip.

8. small-sized photographic module according to claim 6 is characterized in that, this rotating cam rail is the perforate of a strip.

9. small-sized photographic module according to claim 6 is characterized in that, also comprises a loam cake, is covered on this pedestal, and exposes this phtographic lens.

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