CN1794031A - Lens driving device - Google Patents
Lens driving device Download PDFInfo
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- CN1794031A CN1794031A CN 200510134071 CN200510134071A CN1794031A CN 1794031 A CN1794031 A CN 1794031A CN 200510134071 CN200510134071 CN 200510134071 CN 200510134071 A CN200510134071 A CN 200510134071A CN 1794031 A CN1794031 A CN 1794031A
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Abstract
The invention provides a lens driving device which is equipped with a turning member formed cylindrically and comprising a magnet 9 and a rotor 8, and a lens barrel (12) moving the lens (10) in the optical axis direction with the turning of the rotor (8), and it is also equipped with a reflection area (13) provided on the lower end face (9a) of the magnet (9), and a photosensor (15) arranged to be opposed to the reflection area (13) and comprising a pair of light projecting part (15a) and light receiving part (15b). By receiving light from the light projecting part (15a) by the light receiving part (15b) through the reflection area (13), the initial position of the lens (10) is detected. So the lens driving device can detect the initial position of a lens and restrain the dimension in a direction orthogonal to an optical axis direction.
Description
Technical field
The present invention relates to purchase in driving various e-machines etc., by motor lens are moved to optical axis direction, and can detect the lens driver of the initial position of lens.
Background technology
As this prior art, also publicity to some extent in patent documentation 1.The prior art has stepping motor, and it makes and keeps the lens framework of focus lens group to move along optical axis direction.As the mechanism of detecting the lens initial position, have simultaneously: shadow shield, it is set at the outer peripheral face of lens framework, and extends setting in the direction vertical with optical axis direction; And photo interrupter (photo interrupter), it has a pair of light-emitting component and photo detector.
In the prior art, the shadow shield that will be arranged at the lens framework when the driving by stepping motor is moved the lens framework inserts between the light-emitting component and photo detector of photo interrupter, and hidden resistance by shadow shield and output voltage can not incide photo detector the time according to the light that sends from light-emitting component, detect the initial position of lens.
In above-mentioned prior art, owing to detect the mechanism of focus lens group initial position is to have the shadow shield that extends the direction vertical with optical axis direction that is arranged at the external side face of lens frame, and along the mechanism of the photo interrupter of the direction vertical configuration with optical axis direction, therefore the size with the optical axis direction vertical direction becomes big, has the problem of miniaturization that can not implement device thus.
Patent documentation 1: the spy opens flat 6-174999 communique.
Summary of the invention
The present invention proposes according to above-mentioned actual conditions of the prior art, and its purpose is for providing a kind of initial position that can detect lens, and can suppress the lens driver of the size on the direction vertical with optical axis direction.
For achieving the above object, of the present invention being characterized as, have: form revolving member cylindraceous and be accompanied by the lens barrel that the rotation of this revolving member makes lens move to optical axis direction, and have: the reflector space and the photoelectric sensor that is can be with this reflector space opposed and that constitute by a pair of light-projecting portion and light accepting part that are arranged at the end face of above-mentioned revolving member, accept the light of above-mentioned light-projecting portion by above-mentioned reflector space by above-mentioned light accepting part, thereby detect the initial position of said lens.
The present invention of Gou Chenging in such a manner can constitute the mechanism of detecting the lens initial position by the reflector space of the end face that is arranged at revolving member and can be with this reflector space opposed and by the photoelectric sensor that a pair of light-projecting portion and light accepting part constitute.That is to say, the reflector space of the end face by being formed at revolving member, and by the photoelectric sensor that light-projecting portion and light accepting part constitute, the outer peripheral face that can not be arranged on revolving member extends along the direction vertical with optical axis direction under the situation of the member that is provided with, and detects the initial position of lens.The size that can suppress by this, the direction vertical with optical axis direction.
In addition, of the present invention being characterized as, in foregoing invention, be positioned at above-mentioned lens barrel below substrate on imaging apparatus is installed, and above-mentioned photoelectric sensor is installed on aforesaid substrate.Because so the present invention who constitutes is provided with imaging apparatus and photoelectric sensor on same substrate, therefore can improve imaging apparatus and photoelectric sensor bearing accuracy with respect to substrate, and the bearing accuracy between imaging apparatus and the photoelectric sensor.
In addition, of the present invention being characterized as, in foregoing invention, above-mentioned revolving member, by the rotor of tubular and be embedded in this rotor and in a circumferential direction the magnet alternately arranged of its N utmost point and the S utmost point constitute.In the outside of above-mentioned revolving member, configuration has the stator component of coil portion.Above-mentioned revolving member forms the part of hollow motor.So the present invention who constitutes owing to drive the part that the revolving member that makes the lens barrel that lens move to optical axis direction forms the hollow motor, therefore can reduce component count.
In addition, of the present invention being characterized as in foregoing invention, at the inner peripheral surface of above-mentioned rotor and the outer peripheral face of above-mentioned lens barrel, is formed with the threaded portion of mutual screw thread Colaesce respectively; And be accompanied by the rotation of above-mentioned rotor, said lens is advanced along above-mentioned optical axis direction spiral shell by above-mentioned each threaded portion.So the present invention who constitutes, the threaded portion by being formed at the rotor inner peripheral surface and be formed at the screw thread Colaesce of the threaded portion of lens barrel outer peripheral face, and lens are moved to optical axis direction by lens barrel, therefore can guarantee the high position precision of lens.
In addition, of the present invention being characterized as in foregoing invention, corresponds respectively to the mobile terminal locations of the above-mentioned initial position of said lens and said lens and forms above-mentioned reflector space.So the present invention who constitutes, by having a pair of light-projecting portion and the photoelectric sensor of light accepting part, can detect the initial position of lens, and can detect the terminal location that lens move to from initial position, can simplify the mechanism of detecting this terminal location as extreme position.
In addition, of the present invention being characterized as in foregoing invention, purchased braking element, and it is by the rotational action of the above-mentioned revolving member of restriction, and the restriction said lens moves beyond the perform region.So the present invention who constitutes stops lens to move beyond the perform region by braking element.
In addition, of the present invention being characterized as, in foregoing invention, above-mentioned braking element is a protuberance that is formed in the fixed component.This protuberance has: first docking section, its be accompanied by above-mentioned revolving member to the rotational action of a direction and dock with this revolving member; And second docking section, it is accompanied by to the rotational action of the other direction opposite with an above-mentioned direction and docks with above-mentioned revolving member.Form above-mentioned reflector space explicitly with the docking location of above-mentioned revolving member and above-mentioned first docking section and the docking location of above-mentioned revolving member and above-mentioned second docking section.So the present invention who constitutes, by having a protuberance of first docking section and second docking section, can limit lens to moving to the direction of further returning from initial position, and can limit lens and move to the direction that surpasses as the terminal location of moving limit position, make the structure of the perform region of lens between remaining on from the initial position to the terminal location become simple from initial position.
The present invention is owing to have the reflector space and the photoelectric sensor that is can be with this reflector space opposed and that be made of a pair of light-projecting portion and light accepting part of the end face that is arranged at revolving member, therefore by these reflector spaces and photoelectric sensor, can detect initial position, and can suppress the size with the optical axis direction vertical direction, can realize becoming for a long time the miniaturization of the device of a difficult problem by this.
Description of drawings
Fig. 1 is the stereoscopic figure of an embodiment of lens driver involved in the present invention.
Fig. 2 removes base station and the rear view represented from state shown in Figure 1.
Fig. 3 cuts open roughly half and the stereographic map represented from state shown in Figure 1.
Fig. 4 is the longitudinal diagram of present embodiment.
Fig. 5 is the stereographic map that the configuration relation of rotor, reflector space and photoelectric sensor in present embodiment is purchased in expression.
Fig. 6 is that expression is purchased in the stereographic map of the magnet of present embodiment.
Fig. 7 is that the lug boss that forms in the upper surface of the magnet of present embodiment is being purchased in explanation, the figure of the snap-fit relationship of the protuberance that forms with the back side in the head rail of present embodiment.(a) figure is the vertical view of magnet, and (b) figure is the rear view of head rail.
Fig. 8 is that expression is purchased in the block diagram of the major part structure of the Motor Control mechanism of present embodiment.
Fig. 9 is a relation between the signal output of expression control position of predefined lens and photoelectric sensor, and the figure of the relation between the control signal S of the driving of the control position of lens and control hollow motor.
Figure 10 be explanation at the figure that purchases reflector space set and the relation of the position between the photoelectric sensor in the lower surface of the magnet of present embodiment, (a) figure is the figure of the state of expression when being taken the photography of body; (b) figure of the figure state midway that to be expression return lens to initial position; The figure of the state when (c) figure is expression lens arrival application position.
Figure 11 is the process flow diagram that expression is contained in the treatment step in the operational part of Motor Control mechanism shown in Figure 9.
Among the figure: 1-printed circuit board (PCB), 2-base station, 3-base, the 4-head rail, 4a-rail projection, 4b-protuberance (braking element), 4b1-first docking section, 4b2-second docking section, 5-stator component (hollow motor), 6-first coil portion, 6a-lead terminal, 6b-lead terminal, 7-second coil portion, 7a-lead terminal, 7b-lead terminal, 8-rotor (rotating member) (hollow motor), 8a-threaded portion, 9-magnet (rotating member) (hollow motor), the 9a-lower surface, 9b-upper surface, 9c-lug boss, the 10-lens, 11-retaining member, 11a-threaded portion, the 12-lens barrel, 12a-threaded portion, 12b-threaded portion, the 12c-groove, 13-reflector space (application position testing agency), 12a-top portion, the 13b-terminal part, the non-reflector space of 14-, 15-photoelectric sensor (application position testing agency), the 15a-light-projecting portion, 15b-light accepting part, 20-control device of electric motor, the 20a-input part, the 20b-operational part, 20c-efferent, 20d-storage part.
Embodiment
Below based on description of drawings in order to implement the best mode of lens driver involved in the present invention.
(structure of present embodiment)
Fig. 1 is the stereoscopic figure of an embodiment of lens driver involved in the present invention.Fig. 2 removes base station and the rear view represented from state shown in Figure 1.Fig. 3 is decide what is right and what is wrong from state shown in Figure 1 roughly half and the stereographic map that illustrates.Fig. 4 is the longitudinal diagram of present embodiment.Fig. 5 is the stereographic map that the configuration relation of rotor, reflector space and photoelectric sensor in present embodiment is purchased in expression.Fig. 6 is that expression is purchased in the stereographic map of the magnet of present embodiment.
Present embodiment such as Fig. 1, shown in 4 like that, purchase: be connected in for example base station 2 of printed circuit board (PCB) 1 of substrate; Be assemblied in the base 3 on these base station 2 surfaces; And head rail 4, it is embedded in the hole that forms on the top of this base 3, and forms upper portion.
In the inner space that forms by these base stations 2, base 3, head rail 4, as shown in Figure 3, Figure 4, dispose stator component 5, this stator component 5 has been purchased second coil portion 7 for example descending fragment position to have first coil portion 6 in last fragment position.As shown in Figure 1 and Figure 2,, connect lead terminal 6a, 6b respectively,, connect lead terminal 7a, 7b respectively at the both ends of second coil portion 7 at the both ends of first coil portion 6.
Inboard at stator component 5 has placed: rotor 8; And be embedded in this rotor 8 and the magnet 9 alternately arranged at the circumferencial direction N utmost point and the S utmost point.By these rotors 8 and magnet 9 and constitute the revolving member that forms with cylindric.In addition, by the revolving member that constitutes by these rotors 8 and magnet 9, and stator component 5 with above-mentioned first coil portion 6 and second coil portion 7, the stepping motor that formation can rotating and form for example salient pole motor of hollow motor.
At the inboard of rotor 8 configuration lens barrel 12, it forms threaded portion 12a with the threaded portion 8a screw thread Colaesce of the inner peripheral surface that is formed at rotor 8 in periphery, and the rotation that is accompanied by rotor 8 can be moved along optical axis direction.At the inboard of this lens barrel 12 configuration retaining member 11, it has and the threaded portion 11a that is formed at the threaded portion 12b screw thread Colaesce of lens barrel 12 inner peripheral surfaces in periphery, keeps lens 10 simultaneously, and moves along optical axis direction integratedly with lens barrel 12.
Upper end at above-mentioned lens barrel 12 forms groove 12c, and form downwards in head rail 4 and protrude, and the rail projection 4a that can in groove 12c, relatively move.By these grooves 12c and rail projection 4a, when rotor 8 rotations, by threaded portion 8a, threaded portion 12a, lens barrel 12 can not move along optical axis direction rotatably.
In the present embodiment, as shown in Figure 6,, form by light reflectivity high white ink water layer or silver and be with the reflector space 13 that constitutes at the lower surface of magnet 9 9a.Surface portion beyond the reflector space 13 of the lower surface 9a of magnet 9 becomes the non-reflector space 14 of the low unprocessed or black processing of light reflectivity etc.
In addition, shown in Fig. 3～5 like that, purchase the photoelectric sensor 15 that constitutes by a pair of light-projecting portion 15a and light accepting part 15b, its can with reflector space 13 arranged opposite of the lower surface 9a that is formed at magnet 9.This photoelectric sensor 15 is installed on the above-mentioned printed circuit board (PCB) 1.In addition, imaging apparatus can be installed on the same printed circuit board (PCB) 1.
By above-mentioned reflector space 13 and photoelectric sensor 15, constitute application position testing agency, it detects magnet 9 and the rotation stop position of rotor 8, the i.e. application position that forms revolving member.
Be formed at the reflector space 13 of the lower surface 9a of above-mentioned magnet 9, as shown in Figure 6, comprise the 13a of top portion corresponding to the initial position of lens 10, and the terminal part 13b of the extreme position that moves corresponding to the optical axis direction as lens 10.
Fig. 7 is that the lug boss that forms in the upper surface of the magnet of present embodiment is being purchased in explanation, the figure of the snap-fit relationship of the protuberance that forms with the back side in the head rail of present embodiment.(a) figure is the vertical view of magnet, and (b) figure is the rear view of head rail.
As Fig. 7 (a) figure or above-mentioned shown in Figure 6,, the lug boss 9c that protrudes upward is set at the upper surface of magnet 9 9b.Shown in (b) figure of Fig. 7 like that, at the back side of head rail 4, be provided with protuberance 4b, it is by the lug boss 9c of butt joint magnet 9, and the rotational action of limit magnet 9, and restriction lens 10 move beyond the perform region.
This protuberance 4b only forms one on head rail 4, and have: the first docking section 4b1, its excessive rotational action to a direction that is accompanied by magnet 9 and rotor 8 promptly makes the magnet 9 that lens 10 are moved upward and the excessive rotational action of rotor 8 in Fig. 4, and docks with the lug boss 9c of magnet 9; And the second docking section 4b2, its rightabout excessive rotational action to an above-mentioned direction that is accompanied by magnet 9 and rotor 8 promptly makes the mobile magnet 9 of lens 10 and the excessive rotational action of rotor 8 downwards in Fig. 4, and docks with the lug boss 9c of magnet 9;
Be formed at the terminal part 13b of reflector space shown in Figure 6 13 of the lower surface 9b of above-mentioned magnet 9, be set up explicitly with the first docking section 4b1 of the protuberance 4b of head rail 4; In addition, the 13a of top portion of above-mentioned reflector space 13 is provided with explicitly with the second docking section 4b2 of the protuberance 4b of head rail 4.
Fig. 8 is that expression is purchased in the block diagram of the major part structure of the Motor Control mechanism of present embodiment.Fig. 9 is the relation between the signal output of expression control position of predefined lens and photoelectric sensor, and the figure of the relation between the control signal S of the driving of the control position of lens and control hollow motor.
In the present embodiment, purchased Motor Control mechanism 20, it will lead to above-mentioned first coil portion 6 makes one group with four kinds of second coil portion 7 different step modes, and by repeating this group, making revolving member is magnet 9 and rotor 8, the mode of leaving initial position with lens 10 is that the mode that is moved upward among Fig. 4 is rotated to a direction, and perhaps the mode of returning initial position with lens 10 is that the mode that moves downwards among Fig. 4 is rotated to the other direction opposite with an above-mentioned direction.This Motor Control mechanism 20, by magnet 9 and rotor 8 are rotated and when lens 10 are turned back to initial position to above-mentioned other direction, the control signal S of driving of above-mentioned hollow motor is controlled in output as follows: promptly when detecting application position by the application position testing agency that is made of reflector space 13 and photoelectric sensor 15 and be the 13a of top portion of reflector space 13, magnet 9 and rotor 8 are returned a step to a direction opposite with above-mentioned other direction, and this returns the initial position that position behind the step becomes lens 10.
As shown in Figure 8, this control module 20, contain: input part 20a, it is imported from for example output of photoelectric sensor 15; Operational part 20b, it carries out processing described later according to the signal from photoelectric sensor 15 that is input to this input part 20a; Efferent 20c, it will be corresponding to each lead terminal 6a, lead terminal 6b, lead terminal 7a, the lead terminal 7b of the hollow motor of the control signal S output of the result of this operational part 20b; And storage part 20d, it will temporarily be stored from the control signal S of described efferent 20c output.
As shown in Figure 9, in the present embodiment, the magnet 9 of the hollow motor that will be controlled by the control signal of Motor Control mechanism 20 and the turned position of rotor 8 are the control position of lens 10, are set at for example 35 positions of from 0 to 34.In addition, control signal S comprises four kinds of step modes of from " 1 " to " 4 ".
For example, the step mode of S=1 is following step mode, and the value A1 of signal that promptly supplies with the lead terminal 6a of first coil portion 6 is that 1 (high level), the value A2 that supplies with the signal of lead terminal 6b are that the value B1 of the signal of 0 (low level), the lead terminal 7a that supplies with second coil portion 7 is that 0 (low level), the value B2 that supplies with the signal of lead terminal 7b are 0 (low levels).That is, during S=1, (B1 B2) becomes the control signal S of (1,0,0,0) for A1, A2 to hollow motor output.
In addition, the step mode of S=2 is that (B1 B2) becomes the step mode of (0,0,1,0) for A1, A2, the step mode of S=3 is that (B1 B2) becomes the step mode of (0,1,0,0) for A1, A2, the step mode of S=4 is that (B1 B2) becomes the step mode of (0,0,0,1) for A1, A2.Control signal S (=1～4) with these four kinds of different step modes constitutes one group, corresponding to four control positions.This control signal S of one group (=1～4) is input to the hollow motor repeatedly, and the magnet 9 of hollow motor and the turned position of rotor 8 are the control position of lens 10, by the correspondence location in shown in Figure 9 0～34.In addition, the initial position of lens 10 is by step mode (A1, A2, B1 B2) becomes (0,0,1,0) control position 0 that control signal (=2) is controlled, terminal location as the extreme position that moves of lens becomes by step mode (A1, A2, B1, B2) become (0,0,0,1) control position 34 that control signal S (=4) is controlled.
In addition, as shown in Figure 9, promptly surpassing the control position 34 1 setting terminal position side ready position ST1 of step place, so that when for example arriving this preparation control position ST1, the lug boss 9c of above-mentioned magnet 9 docks with the first docking section 4b1 of the protuberance 4b of head rail 4.In addition, 0 returning the preparation control position ST2 that a step is set the initial position side again from the control position, so that when for example arriving this preparation control position ST2, the lug boss 9c of magnet 9 docks with the second docking section 4b2 of the protuberance 4b of head rail 4.In addition, in this Fig. 9, so-called " uncertain ", the light that expression is sent from the light-projecting portion 15a of photoelectric sensor 15 is because by the above-mentioned reflector space 13 shown in Figure 6 and the boundary line of non-reflector space 14, its output or become 0 or become 1 non-steady state.
(action of present embodiment)
Figure 10 is explanation at the figure of the position relation of purchasing the reflector space that is provided with in the lower surface of the magnet of present embodiment and photoelectric sensor, and (a) figure is the figure of the state of expression when being taken the photography of body; (b) figure of the figure state midway that to be expression return lens to initial position; The figure of the state when (c) figure is expression lens arrival application position.Figure 11 is the process flow diagram that expression is contained in the treatment step in the operational part of Motor Control mechanism shown in Figure 9.
For example, be held in the state that initial position is the control position 0 among Fig. 9 at lens 10, if the control signal S from the efferent 20c of Motor Control mechanism 20 is output to hollow motor S, the revolving member that then constitutes this hollow motor is that magnet 9 and rotor 8 are to above-mentioned direction rotation.Be accompanied by the rotation to a direction of this rotor 8, lens barrel 12 moves to the last direction of Fig. 4 by threaded portion 8a, 12a, with this lens barrel 12 integratedly maintaining part 11 be that lens 10 are moved upward.During this period, control signal S is to become S=3 from S=2, and 4 mode is exported in turn, then exports in turn in the mode that becomes S=1～4 thereafter, below, according to applying a group of S=1～4 to the hollow motor repeatedly facing to the focal length of the lens 10 of the body that is taken.When the control position that arrives corresponding to focal length, stop to export control signal from Motor Control mechanism 20, do not carry out the photography of the body that is taken hoped.
In addition, during this period, be accompanied by the rotation along arrow 21 directions of Fig. 6 of the magnet 9 that constitutes revolving member, as shown in Figure 9, the output of photoelectric sensor 15 changes to " 0 " from " 1 ".Here, suppose when lens 10 move to the preparation control position ST1 shown in Figure 9 that surpasses as the control position 34 of mobile terminal locations, the terminal part 13b that detects reflector space 13 shown in Figure 6 by photoelectric sensor 15 is an application position, the output of photoelectric sensor 15 becomes " 1 " thus, Motor Control mechanism 20 is changed to S=4 with control signal S, and lens 10 are returned a step and to the control position 34 from preparation control position ST1, and at this moment, the output of stop control signal S.In addition, during this period, when lens 10 move to preparation control position ST1, be arranged at the lug boss 9c of the upper surface 9b of the magnet 9 shown in (a) figure of Fig. 7, be docked at the first docking section 4b1 of the protuberance 4b of the head rail 4 shown in (b) figure of Fig. 7, the above rotation of limit magnet 9 and rotor 8 thus.
On the other hand, lens 10 are held in one of them control position and to after the body photography of being taken, and return control from the initial position of the control lens 10 of this control position when initial position returns and are undertaken by the processing shown in the process flow diagram of Figure 11.The processing of the process flow diagram of this Figure 11, mainly the operational part 20b by Motor Control mechanism 20 carries out.
Here, as an example, illustrate that lens 10 are from by the static situation of state when initial position returns that remains in control position shown in Figure 9 13.
When lens 10 turn back to initial position, as the step S1 of Figure 11, in the operational part 20b of control device of electric motor 20, by being stored in the control signal S of storage part 20d, and the value of carrying out the static previous control signal S of lens 10 is and so on affirmation work.At this moment, lens 10 are S=3 by the previous control signal of static maintenance, are confirmed to be control position shown in Figure 9 13 by the static control position that is keeping, and in step S2, export the control signal S of the step mode (0,1,0,0) of S=3 to the hollow motor.
Next, shown in step S3 like that, the value " 3 " of the control signal S of current transmission temporarily is stored in storage part 20d, the step of next dividing a word with a hyphen at the end of a line S4 goes forward side by side and is about to the value of S and deducts 1 computing.At this moment, become S=3-2=1.
Next, the step of dividing a word with a hyphen at the end of a line S5, whether the value of carrying out S is 0 judgement.At this moment, because therefore S=2 rather than 0 is judged as not, and turns back to step S2 once more, export the control signal S of the step mode (0,0,1,0) of S=2 to the hollow motor.By this, constitute the magnet 9 of revolving member and rotor 8 to an above-mentioned side other directions in the opposite direction, i.e. the reverse direction of the arrow 21 of Fig. 6 rotation, lens 10 turn back to the control position 12 of Fig. 9.
Next, in step S3, the storage of storage part 20d is updated to S=2 from S=3, and in step S4 computing S=2-1=1.
Next, the step of dividing a word with a hyphen at the end of a line S5, and judge whether S is 0.To hollow motor export the control signal S of the step mode (1,0,0,0) of S=1 because therefore S=1 rather than 0 is judged as not, and turns back to step S2 once more this moment.By this, lens 10 turn back to the control position 11 of Fig. 9.And in step S3, the storage of storage part 20d is updated to S=1 from S=2, and in step S4 computing S=1-1=0.
Next, the step of dividing a word with a hyphen at the end of a line S5, and judge whether S is 0.At this moment, position signalling is 0, and is judged as and is, thereby divides a word with a hyphen at the end of a line step S6.In this step S6, read position signalling from photoelectric sensor 15.At this moment, read the output from photoelectric sensor 15 " 0 " corresponding to control position 11.
Next, the step of dividing a word with a hyphen at the end of a line S7, and judge whether position signalling is 0.At this moment, S=0 is judged as and is, and moves to step S8.In this step S8, be set at S=4, and turn back to step S2.In step S2, export the control signal S of the step mode (0,0,0,1) of S=4 to the hollow motor.By this, lens 10 turn back to the control position 10 of Fig. 9.
During this period, the position relation of reflector space 13 and photoelectric sensor 15 of being located at the lower surface 9a of magnet 9 is the relation shown in (b) figure by the relationship change shown in (a) figure of Figure 10.
Below, carry out same processing and action repeatedly, if be arranged at the such application position that arrive photoelectric sensor 15 on of the 13a of top portion shown in (c) figure of Figure 10 of reflector space 13 of the lower surface 9a of magnet 9, and lens 10 surpass as the control position 0 of initial position and move to preparation control position ST2 shown in Figure 9, and the control signal S of this moment becomes S=1.
Therefore, the computing of the step S4 of Figure 11 becomes S=1-1=0.The judgement of step S5 becomes.And in step S6, read position signalling from photoelectric sensor 15.During this period, the light that sends from the light-projecting portion 15a of photoelectric sensor 15 is reflected by reflector space 13, and is input to light accepting part 15b.Output from photoelectric sensor 15 becomes " 1 ".If the input part 20a by Motor Control mechanism 20 is input to operational part 20b from the output " 1 " of this photoelectric sensor 15, then the judgement of the step S7 of Figure 11 becomes not, and the step S9 that divides a word with a hyphen at the end of a line.
In this step S9, export the control signal S of the energising form (0,0,1,0) of S=2 to the hollow motor.By this, constitute the magnet 9 and the rotor 8 of revolving member, from the other direction of its arrival once more to a described direction, be that the direction shown in the arrow 21 among Fig. 6 is returned a step, to be lens 10 return a step from the preparation control position ST2 of Fig. 9, and to arrive control position 0 be initial position, at this moment, the output of stop control signal.
During carrying out this action, when lens 10 move to preparation control position ST2, the lug boss 9c that is arranged at the upper surface 9b of the magnet 9 shown in (a) figure of Fig. 7 is docked at the second docking section 4b2 of the lug boss 4b of the guide rail 4 shown in (b) figure of Fig. 7, the further rotation of limit magnet 9 and rotor 8 by this.
(effect of present embodiment)
According to the present embodiment that constitutes as described above, utilization is arranged at the reflector space 13 of the lower surface 9a of the magnet 9 that constitutes revolving member, and can be with this reflector space 13 opposed and by the photoelectric sensor 15 that a pair of light-projecting portion 15a and light accepting part 15b constitute, can constitute the mechanism of the initial position that detects lens 10.That is to say, the photoelectric sensor 15 that constitutes by reflector space 13, light-projecting portion 15a and light accepting part 15b by the lower surface 9a that is formed at magnet 9, the outer peripheral face that is not arranged on magnet 9 extends the member that is provided with along the direction vertical with optical axis direction, promptly can detect the initial position of lens 10.By this, can suppress the size of the direction vertical, miniaturization that can implement device with optical axis direction.
In addition, be provided with under the situation of imaging apparatus and photoelectric sensor 15 on the same printed circuit board (PCB) 1, can improving imaging apparatus and photoelectric sensor 15 bearing accuracy with respect to printed circuit board (PCB), and the bearing accuracy of imaging apparatus and photoelectric sensor 15.
In addition, in the present embodiment, to make the revolving member of the lens barrel 12 that lens 10 move to optical axis direction be the part that magnet 9 and rotor 8 have formed the hollow motor owing to drive, and therefore can reduce component count, and be of value to the inhibition manufacturing expense.
In addition, because in the present embodiment, made the screw thread Colaesce of the threaded portion 8a that utilizes the inner peripheral surface that is formed at rotor 8 and the threaded portion 12a of the outer peripheral face that is formed at lens barrel 12, and by lens barrel 12 lens 10 are moved to optical axis direction be the mode of precession, therefore can guarantee the high position precision of lens.
In addition, in the present embodiment, owing to utilize the photoelectric sensor 15 with a pair of light-projecting portion 15a and light accepting part 15b can be when the initial position that detects lens 10 be control position 0 shown in Figure 9, the terminal location that moves that also can detect lens 10 be control position 34 shown in Figure 9.The mechanism of detecting this terminal location becomes simply, therefore is of value to the inhibition manufacturing expense.
In addition, in the present embodiment, can prevent that by the protuberance 4b that is arranged at head rail 4 lens 10 from moving beyond the perform region.That is to say that a protuberance 4b has: the first docking section 4b1, it limits moving of these lens 10 when lens 10 will be moved beyond terminal location; And the second docking section 4b2, it surpasses at lens 10 and limits moving of these lens 10 will be moved beyond initial position the time.Therefore, the structure that lens 10 are remained in the perform region between initial position and the terminal location becomes simply, also is of value to the raising of manufacturing expense thus.
In addition, in the present embodiment, by Motor Control structure 20, to lead to first coil portion 6 of stator component 5 and four kinds of different step mode { A1 of second coil portion 7, A2, B1, B2}={ (1,0,0,0) (0,0,1,0) (0,1,0,0) (0,0,0,1) } making one group, by repeating this group, is being that direction from initial position to lens 10 that make the magnet 9 that constitutes revolving member and rotor 8 return is when rotating with the hollow Motor Control, from photoelectric sensor 15 outputs " 1 ", when the application position that detects corresponding to reflector space 13 13a of top portion, must return a step to a direction opposite with above-mentioned other direction, lens 10 turn back to control position 0 from preparation control position ST2 shown in Figure 9 by this.So this control position 0 becomes the initial position of lens.Therefore, can not be subjected to play to influence ground, control by 20 pairs of hollow motor of Motor Control mechanism, it is initial position that lens 10 are turned back to control device shown in Figure 90, the control that resets of the initial position that can realize not producing the high-precision lens 10 of initial position dislocation can be guaranteed good performance.
Claims (7)
1, a kind of lens driver is characterized in that,
Have: with the revolving member of cylindric formation and be accompanied by the lens barrel that the rotation of this revolving member makes lens move to optical axis direction,
And have: be arranged at the reflector space and the photoelectric sensor that is can be with this reflector space opposed and that constitute by a pair of light-projecting portion and light accepting part of the end face of above-mentioned revolving member,
Be subjected to the light of the above-mentioned light-projecting portion of light by above-mentioned reflector space by above-mentioned light accepting part, thereby detect the initial position of said lens.
2, require 1 described lens driver according to aforesaid right, it is characterized in that,
Be positioned at above-mentioned lens barrel below substrate on imaging apparatus is installed, and above-mentioned photoelectric sensor is installed in aforesaid substrate.
3, require 1 described lens driver according to aforesaid right, it is characterized in that,
Above-mentioned revolving member, by the rotor of tubular and be embedded in this rotor and in a circumferential direction the magnet alternately arranged of the N utmost point and the S utmost point constitute;
In the outside of above-mentioned revolving member, configuration has the stator component of coil portion;
Above-mentioned revolving member forms the part of hollow motor.
4, require 3 described lens drivers according to aforesaid right, it is characterized in that,
At the inner peripheral surface of above-mentioned rotor and the outer peripheral face of above-mentioned lens barrel, be formed with the threaded portion of mutual screw thread Colaesce respectively; And,
Be accompanied by the rotation of above-mentioned rotor, said lens is by above-mentioned each threaded portion, along above-mentioned optical axis direction precession.
5, require 1 described lens driver according to aforesaid right, it is characterized in that,
Correspond respectively to the mobile terminal locations of the above-mentioned initial position of said lens and said lens and form above-mentioned reflector space.
6, require 1 described lens driver according to aforesaid right, it is characterized in that,
Purchased braking element, it is by the rotational action of the above-mentioned revolving member of restriction, and the restriction said lens moves beyond the perform region.
7, require 6 described lens drivers according to aforesaid right, it is characterized in that,
Above-mentioned braking element is a protuberance that is formed at fixed component;
This protuberance has: first docking section, its be accompanied by above-mentioned revolving member to the rotational action of a direction and dock with this revolving member; And second docking section, it is accompanied by to the rotational action of the other direction opposite with an above-mentioned direction and docks with above-mentioned revolving member;
With the docking location of the docking location of above-mentioned revolving member and above-mentioned first docking section and above-mentioned revolving member and above-mentioned second docking section explicitly, form above-mentioned reflector space.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004373808 | 2004-12-24 | ||
| JP2004373808A JP2006178332A (en) | 2004-12-24 | 2004-12-24 | Lens driving device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1794031A true CN1794031A (en) | 2006-06-28 |
| CN100368853C CN100368853C (en) | 2008-02-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101340711A Expired - Fee Related CN100368853C (en) | 2004-12-24 | 2005-12-23 | Lens driving device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2006178332A (en) |
| CN (1) | CN100368853C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100582842C (en) * | 2006-09-22 | 2010-01-20 | 鸿富锦精密工业（深圳）有限公司 | Digital camera module and its assembling method |
| CN101501547B (en) * | 2006-08-07 | 2010-08-18 | 夏普株式会社 | Imaging device |
| CN102313955A (en) * | 2010-07-05 | 2012-01-11 | 佳能企业股份有限公司 | Lens device |
| US8422153B2 (en) | 2010-06-17 | 2013-04-16 | Ability Enterprise Co., Ltd. | Lens device |
| WO2021217370A1 (en) * | 2020-04-27 | 2021-11-04 | 南昌欧菲精密光学制品有限公司 | Lens barrel assembly, lens assembly, camera module and electronic device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100552485C (en) * | 2006-11-22 | 2009-10-21 | 富准精密工业(深圳)有限公司 | Embedded focus lens structure |
| JP5591571B2 (en) * | 2010-03-25 | 2014-09-17 | 日本電産サンキョー株式会社 | Lens drive device |
| JP6158043B2 (en) * | 2013-10-31 | 2017-07-05 | シャープ株式会社 | Camera module, electronic device, and imaging lens positioning method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3193393B2 (en) * | 1991-05-15 | 2001-07-30 | キヤノン株式会社 | Movable member position detector |
| JPH11202185A (en) * | 1998-01-13 | 1999-07-30 | Nitto Kogaku Kk | Leans driving device |
| JP4510209B2 (en) * | 1999-06-09 | 2010-07-21 | 富士フイルム株式会社 | Zoom lens device |
| JP2002357762A (en) * | 2001-05-30 | 2002-12-13 | Olympus Optical Co Ltd | Camera with zoom lens |
-
2004
- 2004-12-24 JP JP2004373808A patent/JP2006178332A/en not_active Withdrawn
-
2005
- 2005-12-23 CN CNB2005101340711A patent/CN100368853C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101501547B (en) * | 2006-08-07 | 2010-08-18 | 夏普株式会社 | Imaging device |
| CN100582842C (en) * | 2006-09-22 | 2010-01-20 | 鸿富锦精密工业（深圳）有限公司 | Digital camera module and its assembling method |
| US8422153B2 (en) | 2010-06-17 | 2013-04-16 | Ability Enterprise Co., Ltd. | Lens device |
| CN102313955A (en) * | 2010-07-05 | 2012-01-11 | 佳能企业股份有限公司 | Lens device |
| WO2021217370A1 (en) * | 2020-04-27 | 2021-11-04 | 南昌欧菲精密光学制品有限公司 | Lens barrel assembly, lens assembly, camera module and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100368853C (en) | 2008-02-13 |
| JP2006178332A (en) | 2006-07-06 |
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