TW201221797A - Leaf spring and lens driving device - Google Patents

Abstract

The present invention provides a shock resistance enhancement leaf spring and lens driving device. The leaf spring of the present invention comprises: a circle ring shaped internal lateral end part (241); an external lateral end part (242) arranged from the internal lateral end part radial outwards; N arm parts (243) arranged along the peripheral direction to connect the internal lateral end part and the external lateral end part; N internal lateral connection parts (244) arranged from the internal lateral end part and radially protruded outward, and connect the internal lateral end part and the N arm parts; and N external lateral connection parts (245) arranged from the external lateral end part and radially protruded inward, and connect the external lateral end part and N arm parts. At least a place between the internal lateral end part (241) and the joint internal lateral connection part (244) has the buffer displacement part (214a).

Description

201221797 发明Invention Description: [Technical Field] The present invention relates to a lens driving device, and more particularly to both sides of an optical axis of a lens holder (columnar movable portion) provided in a lens protector assembly (lens barrel) And a leaf spring (support member; elastic member) that supports the lens holder with respect to the state in which the lens holder is fixed in the direction of the alignment, and the lens holder is displaceable in the optical axis direction. [Prior Art] It is possible to mount a camera for a mobile phone with a camera. Since the lens driving device 4 for autofocusing is used on a 嶋 type camera, various lens driving devices for focusing have been used. Patent Document 1 (JP-A No. 2, No. 2, 55) discloses a lens driving device that is resistant to impact. As the lens is still left behind = the vcm method using the voice coil motor (VCM) = #方=白f兄 drive device 'used to use the column including the lens in the fixed part in the diameter To the positioning 嶋^, the yoke is provided on the both sides of the columnar movable WO in the direction of the first axis of the movable lens element (= support member = member), usually iR) ΛΑ # see 1 Bodhisattva. The movable part of the helper is supported by the agency. The reverse reading "(the fixed part of the column) is placed around the casing (the cylindrical leaf spring is enough to move in the direction of the wire. A pair of plates read It is called the upper side phthalocyanine, and the other sapling is called the lower side, and various leaf springs which have improved impact resistance are proposed.

3/26 S 201221797 For example, the leaf spring of the above-mentioned patent document. The leaf spring includes an outer portion (outer ring portion) which is formed to be rounded, and an outer peripheral side end portion (outer ring portion) and an inner peripheral side end portion (between the inner ring portion and the outer peripheral side end portion) The inner peripheral side end portions are extended in the circumferential direction, and the inner peripheral side end portions and the arm portions are in the outer side of the arm portion. The inner peripheral side end portions of the respective arm portions are radially outwardly projecting from the outer peripheral side of the connecting portion from the outer peripheral side. At least one of the width of the inner peripheral side of the arm portion is larger than the width of the middle portion of the arm portion = the width of the plate. Patent Document 2 (Japanese Patent Laid-Open) The camera module disclosed in Patent Document 2 discloses that the stress generated by the impact is concentrated to the bridge module of the (fourth) and the impact resistance is good. The outer ring portion (10)). The bridge portion has a slit as a mechanism for preventing the stress collection t at the inner circumference and the inner ring portion formed at the joint portion. Yag, Patent Document 3 (Japan Tekai Cong _ secretly opened the following lens driving device, the ^ report ^::: two on the leaf spring of the holder holding the lens; =: for: to stop the above-mentioned board Plastic deformation. To arrange the force lens 3 disclosed in the lens drive: the support of the lens, the fixed brother 7 placed on the outside of the frame, the lower side of the support bracket and the fixed member of the one and the knife include - Lishan... The slab m member (leaf spring), the slab slab, and the bracket side circular portion on one side of the fixed side (the inner peripheral side fixing ring 疋 is fixed on the fixing member side circular portion (the outer peripheral side is fixed at 4/26 201221797) a ring portion) and a plurality of rod portions connecting the bracket side arc portion (inner peripheral side mosquito ring portion) and the fixing member side arc portion (outer peripheral side fixing ring portion). Each of the rod portions includes a first arc portion and a second portion a second arc portion and a substantially U-shaped bent portion. The first-BI arc portion protrudes from the inner peripheral side protruding piece connected to the inner peripheral side fixing ring portion toward the outer peripheral side of the outer peripheral side fixing ring portion. The sheet-like direction extends. The second circular arc portion protrudes from the outer peripheral side to cause the circumferential direction toward the inner peripheral side to protrude from the sheet. The curved portion is connected to the first circular arc portion and the second circular arc portion, and protrudes outward in the radial direction of the bracket. The curved portion is provided at a position where the bending moment for bending the rod portion in the driving direction is substantially zero.曰本特开2009_2丨0055 (Fig. 3) Patent Document 2: Japanese Patent Laid-Open No. 2007-32254 (Picture), Japanese Patent Laid-Open No. 2008-116622 (Fig. 2) - but 疋, for the lower side plate In the spring, the inner peripheral side end portion (inner ring portion) is fixed to the tree, the lower side of the lens holder is formed, and the outer peripheral side end portion (outer ring portion) is clamped and fixed to the base member (the crane seat). In detail, the end portion of the lower leaf spring (the (four) portion) is fixed (supported) at the lower end of the lens holder by heat-welding the support portion provided at the lower end of the resin lens holder. In the thermal direction, the lower leaf spring is fixed with respect to the optical axis direction of the lens holder. In the case of the lateral direction (# direction), there is a gap (void) in the lower leaf spring. Therefore, it is passed through a compact camera. Drop impact test, at the inner ring of the lower leaf spring Between each of the support portions, a deflection occurs in the inner ring portion toward the length thereof. As a result, the portion of the inner ring portion is deformed in a direction rising from the lower end of the lens holder, and is disposed opposite to the lower leaf spring. The base member (driver base) of the position interferes. Therefore, it is possible to produce a lens

5/26 S 201221797 The posture of the rack is inclined with respect to the fixed portion including the base member (drive base). Further, since the posture of the lens holder is inclined, there is a possibility that the characteristics of the lens driving device are deteriorated, and the lower leaf spring comes into contact with the base member, which may cause a problem of dust accumulation. In the above-mentioned Patent Documents 1 to 3, the above-described disadvantages are not recognized (described), and the leaf springs disclosed in Patent Documents 1 to 3 are not subjected to any countermeasure against the above-described problems. SUMMARY OF THE INVENTION An object of the present invention is to provide a mirror driving device that further improves impact resistance. Another object of the invention is to provide a lens drive device capable of suppressing deterioration of characteristics. Another object of the present invention is to provide a lens drive device capable of preventing dust accumulation according to the first aspect of the present invention. The fixing portions 12, 18, and 2 around the outer portion of the columnar movable portion 14 in the center portion are capable of obtaining the following leaf springs 24 r Z4 > ^, 16 relative to the central axis Disposed in the state of the movable '28 in the radial direction, the leaf spring 24 is characterized by: an annular inner peripheral side end.

741 at the outer peripheral side end portion and the N-arm portion □ from the inner peripheral side end portion to the half end portion 242; N pieces provided to connect the inner peripheral side (N is 2 to protrude radially outward from the inner peripheral side end portion) The n inner peripheral side connecting portions of the N arms are protruded inward in the idle direction, and are connected to the outer peripheral side connecting portion 245, and the inner peripheral side 6/26

S 201221797 The eating portion 241 has a cushion displacement portion 241a at least at a position between the adjacent inner peripheral side connecting portions 244. In the leaf spring 24 of the first aspect of the invention, the inner peripheral side connecting portion 244 preferably has an opening 244a for attaching the inner peripheral side end portion 241 to the movable portion 16 . The buffer displacement portion 241a is preferably selected from, for example, a substantially u-shaped, Ω-shaped, or S-shaped shape. The material of the leaf spring 24 is preferably made of high hardness stainless steel. According to the second aspect of the present invention, it is possible to obtain a lens driving device 10 having a fixing portion 丨2 having a cylindrical portion for holding the lens element and disposed around the lens holder. a, 汾, %; an upper leaf spring 22 connecting the lens holder and the fixing portion on the upper side thereof; and a lower leaf spring 24 connecting the fixing portion on the lower side, the lens driving is broken, characterized by the lower side plate The spring 24 has an annular lower inner circumferential side end portion 241 fixed to the lower end of the lens holder, and a lower outer circumference that is fixed to the solid and two inner circumferential side end portions that are spaced apart from the outer side in the radial direction: W 242; The N ridges that are connected to the lower inner circumferential side end portion and the lower side and are circumferentially arranged are N integers of 2 or more, and N of the lower arm portions are protruded from the lower inner circumferential side end portion toward the radial outer side. The lower inner peripheral side:: f is connected to the lower outer peripheral end and the lower arm of the purlin. The lens driving crucible 4 of the second aspect of the present invention is preferably provided at the lower end thereof. N support portions 144 for supporting the lower side plate = middle, lens end portion. In this case, the inner side of the lower side of the iliac crest is connected to the inner side of the Hungarian side.

S 201221797

The joint portion 244 has an upper plate 22 221 which is fixed to the lens holder 4 by an NS having a lens holder, and an upper surface which is fixed to the fixed portion and which is disposed away from the upper side and the left side of the '::: side end portion The outer peripheral side end portion 222 is formed between the outer side portion and the upper outer peripheral side end portion and protrudes in the circumferential direction 7 and is connected to the upper side inner peripheral side end portion and the joint portion 224; and from the upper side outer side = protruding The connection and the connection of the upper outer peripheral side end portion and the comparison value have the same from the upper outer peripheral side end portion 222, and the reference numeral 4 is easily understood and is an example, which is of course not limited thereto. /, The effects of the present invention are as follows. In the present invention, since the cushion displacement portion is provided at at least one portion between the adjacent inner peripheral side connecting portions at the inner circumferential side end portion of the panel, the inner circumferential side end portion and the arm portion can be prevented from being deformed. [Embodiment] [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. A lens driving device 10 according to an embodiment of the present invention will be described with reference to Figs. 1(A) to (C) and Fig. 2 . Figure 1 (A) is the lens drive unit ι〇 8/26

S 201221797 Top view Figure 1 (B) is the lens drive is the right side view of the lens drive H). The figure is shown in an exploded perspective view of Figure 1 (8). (4) 2 疋 mirror driving device 10 Here, as shown in Figure 1 (A) to (C) ((10). In the figure! and Figure 2 using the right angle sitting (x, Y, z) towel, the X axis is before and after The scoop-like evil is 'in the right direction of the Cartesian coordinates (width direction), the ζ axis is up and down; ^ depth direction), and the Υ axis is left in the example shown in Figs. 1 and 2, up and down = degree direction). Further, the direction of the light is the light of the lens. However, in the actual use situation, the direction is the front-rear direction. In other words, °, that is, the lower direction of the Ζ axis is the rear direction. Let the direction be the front direction, 透镜 The lens driving device 1G shown in the figure is a VCM-type VCM-type camera that can be moved in the direction of the optical axis. Cartridge) (not (t mandrel). Lens drive device, the first axis 0 is the drive shaft device H) has a configuration in the Z-axis direction ('33 ^ lens-driven base member (, _ pedestal) 12; ^ Α ^ The lower part (rear part) of the Γ side (rear side) seat 12 is dancing: (the driver base substrate is mounted with a photographic element or a clock-moving device 1 〇 and the sensor substrate is blocked (not shown in the salty body) The material is generated from the _ substrate. 1 by the assembly of the lens drive | set 1G, and the mask shell structure shadow module. 16 to ~ pieces

9/26 S 201221797 The camera element captures the subject image imaged by the lens element and converts it to the electric L number. The photographic element is composed of, for example, a CCD (charge coupled device) type image sensor and a CM 〇 (complementary metal oxide semiconductor )) type image sensor temple. The lens driving device 10 includes a resin lens holder 14 having a tubular portion 140 for holding a lens element (lens tube), and a driving coil fixed to the lens holder 14 so as to be positioned around the cylindrical portion 14A. a permanent yoke 18 disposed opposite to the drive coil; a yoke 20 holding the permanent magnet 18; and a pair of leaf springs 22 provided on both sides of the optical axis 〇 of the cylindrical portion 14 透镜 of the lens assembly 4 ,twenty four. - The leaf springs 22, 24 are positioned radially in the radial direction of the lens element 14j, and are displaced in the (10) direction. One of the pair of leaf springs 22, 24 is referred to as an upper leaf spring, and the other leaf spring 24 is referred to as a lower leaf spring. Further, as described above, in the actual use state, the upper direction of the z-axis direction (optical axis 〇 direction) is the front direction, and the lower direction of the Z-axis direction (optical axis 〇 direction) is the rear direction. Therefore, the upper side leaf spring 22 is also referred to as a front side spring, and the lower side leaf spring 24 is also referred to as a rear side spring. The upper leaf spring (front side spring) 22 and the lower side leaf spring (rear side spring) 24 are formed of, for example, metal such as stainless steel or beryllium bronze. Further, the upper side sill (front side spring) 22 and the lower side leaf spring (rear side spring) 24 are manufactured by adding OL to the slab, or using lithography.

And 'etching processing is more desirable than press working. The reason is that no residual stress is left in the leaf spring during the etching process. X In addition, as the material of the leaf spring, it is preferable to use stainless steel, especially high-hardness stainless steel, compared to beryllium bronze. The reason is that it is well known that the compound of 铍 10/26 201221797 is highly toxic, and from the environmental point of view, the material used as a leaf spring is a material other than beryllium bronze (excluding bismuth). Further, as the high-hardness stainless steel, for example, NTK S-4 or NTK 301 (SUS301) manufactured by Nippon Metal Industries Co., Ltd. can be used. The magnetic vehicle 20 has a quadrangular cylindrical shape. That is, the magnetic vehicle 20 includes: an outer tubular portion 202 having a substantially rectangular tubular shape; a quadrangular annular end portion 204 extending from the upper end (front end) of the outer tubular portion 202 to the inner side of the outer tubular portion 202; and the ring shape The inner side of the end portion 204 has two inner vertical extending portions 206 extending vertically downward in parallel with the optical axis 在 at opposite ends in the front-rear direction X. Each of the outer cylindrical portions 202, referred to as the cover yoke 'two inner vertical extensions 206, is referred to as a back yoke. In the outer tubular portion (mask yoke) 202, the central portion 201-1 of the pair of sides facing each other in the left-right direction γ protrudes outward in the radial direction. Therefore, the drive coil 16 also has a substantially quadrangular cylindrical shape in conformity with the shape of the quadrangular cylindrical magnetic vehicle 20. The tubular portion 140 of the lens holder 14 has two contact portions 140-1 projecting outward in the radial direction at a position corresponding to the left-right direction Y of the drive coil 16. The two flat portions 162 of the drive coil 16 are struck at the two contact portions 140-1. That is, the drive coil 16 is ablated at the two contact portions 140-1 of the tubular portion 140. On the other hand, the permanent magnet 18 includes four permanent magnet pieces 182 arranged in a triangular cross section at the four corners of the magnetic vehicle 20, and two sectional rectangular permanent magnet pieces 184 opposed to the above two flat portions 162 of the drive coil 16. . Specifically, the two-section rectangular permanent magnet piece 184 is attached to the inner wall of the central portion 202-1 of the pair of sides of the outer tubular portion 202 of the magnetic particle 20. That is, the permanent magnet 18 is composed of a total of six permanent magnet pieces 182, 184 disposed at the four corners and the both sides of the rectangular portion of the rectangular portion of the magnetic cylinder 20.

S 11/26 201221797 In the outer tube portion of the magnet roller 20 (the single magnet coil), the permanent magnet is disposed at intervals of the stone. The _ surface and the upper side leaf spring (front side magazine) 22 are disposed in the transparent portion. Upper side (front side), lower side leaf spring (rear side spring A) = optical axis of the second frame 14, - placed on the lens 22 and (back side spring) - (纟 = single spring) - two ==== in the lens The frame ^ 20 6/, ^ uL , and the outer peripheral side of the upper side of the magnetic bag-like portion 204 as will be described later. The side end work and the upper outer peripheral side end portion 2 = f 2 = the upper inner circumference 223 Each of the upper arm portions 22^^ slantes four upper arm side end portions 222 connected to the upper side inner peripheral side end portion 221 and the upper side outer circumference to the transmissive spring (rear side spring) 24 having a mounting force as described later. The lower outer peripheral side end portion of the seat (base member) 2 is provided with a disk and a lower arm portion 243 between the lower inner peripheral side end portion 241 and the lower outer peripheral side end portion 242. Each lower arm portion 243 is connected to the lower inner peripheral side end portion 24 and the lower outer peripheral side end portion 242. The inner peripheral side end portion member 242 is also referred to as an inner ring portion (inner ring portion), and the outer peripheral side end portions 224 and 244 are also Outer ring part In addition, the detailed structure of the upper side plate * (front side spring) 22 (configuration = dipping, rear side reference 7 will be described as 'the lower side rear side spring), and the sheep fine structure (structure) will be referred to later in FIG. 4 is a description of the mounting method of the upper side sapphire (front side spring) 22. The upper side inner peripheral side end of the upper side plate yellow (front side spring) 22 is permeable.

12/26 S 201221797 The frame 14 is held and fixed by the limiter 26. In other words, the restrictor 26 that sandwiches the upper side plate (the upper end inner peripheral side end portion 221 and the lens holder) between the upper end of the lens holder 14 and the upper end of the lens holder 14 has a function to be described later. Ie, limit

The upper inner peripheral side end portion of the side plate 箦 (front side spring) 22 has a function of adhering to the lens holder 14 with high precision. ",", deviation, high (voice coil motor) characteristics of the deviation. In addition, the limit of the month 1 ^ improve the VCM leaf spring (front side spring) 22 _ joint strength function This J high upper side frame drive 1G resistance. Moreover, the upper side leaf spring at the time of the falling impact of the lens and the moving device 10 is improved: the front side::: stops the function of k幵, thereby also giving the function of $^) 22. The machine with the heart of the private drive (7) On the other hand, the upper side leaf spring (the front side spring portion 222 is held at the annular end portion 2 of the magnetic vehicle 20, and the Π8 has a circular shape at the center portion, and the hood 28 is in its The four outer corners of the upper side of the upper side plate 22 which protrude downward are provided with the four protrusions (282i pass = through hole and the four corners of the ring end of the '·2〇 have four projections 282 which are inserted into the four protrusions 282 The insertion holes 2, such as the four protrusions 282 of the cover 28, pass through the upper side 柘 more than μ h, and the dry 222a 2 222 mourns into the hole coffee. __ the annular end portion 2 〇 4 of the four sub- and 'on the upper side leaf spring An annular sheet for adjusting the spring constant is disposed between the upper peripheral side end portions of the upper side of the 22nd. "Zhuo next" to the lower side leaf spring (rear side spring) The method of 24 is performed on 13/26 201221797. The lower outer peripheral side end portion 242 of the lower leaf spring (rear side spring) 24 is fixed to the magnetic vehicle 20 by the annular gusset 30. In other words, the cushion 3〇 The lower outer peripheral side end portion 242 of the lower side plate yellow (rear side spring) 24 is sandwiched between the yoke 2 〇 and the base member (drive base) 12 and fixed. In detail, the base member (driver) The base portion has a circular opening portion 12a at the center portion and has a quadrangular ring shape. The base member (drive base) 12 has four protrusions 122 projecting upward at four corners thereof. The lower side outer circumference of the lower leaf spring 24 The side end portion 242 has four through holes 242a through which the four protrusions 122 pass. The lining 30 has the insertion holes 13〇a in which the four protrusions 122 are fitted. Therefore, the four protrusions of the base member (drive base) 12 22 is inserted into the four insertion holes 30a of the spacer 3〇 through the four through holes 242a of the lower outer peripheral side end portion 242 of the lower leaf spring 24. As will be described later with reference to Fig. 5, the lower leaf spring (back) The lower inner peripheral side end portion 241 of the side spring 24 is fixed (supported) under the lens holder 14 (rear end) side. The lower end portion of the lens holder 14 is fitted into the circular opening portion 12a of the base member (drive base) 12 with a gap. In other words, the lower end portion of the lens holder 14 and the base member (drive base) 12 is provided with a gap in the circular opening portion 12a. The base member (drive base) 12 is provided with an IR cut filter (not shown). The base member (drive base) 12 is manufactured by injection molding. The material of the base member (drive base) 12 is made of, for example, an engineering plastic such as a liquid crystal polymer (LCP). As is well known, LCP is a less flexible resin. The base member (drive base) 12 has a ring-shaped base portion 12〇; 14/26 201221797 and protrudes upward from the left-central portion to the upper left-center portion of the lost magnet 20 The raised angle is a large angle 124-1 of the four corners. Each protrusion = from =«. In the _ of the wealth, each sudden =.1 Wei or so. Each of the protrusions 124_ is at the upper portion thereof and has a substantially conical shape

Altr/4_la. Further, the lower end 124_lb of each of the projections 24·1 is located above the substrate abutting surface of the base member base 12 . 142. The fourth portion of the portion MG is provided with a male thread, although not shown, but a male thread that is threadedly coupled to the female screw 142 in the lens assembly (lens barrel). Therefore, when the lens holder 14 is attached to the lens holder 14, the lens element (lens barrel) is obtained by screwing the lens element and the eyepiece to the cylindrical portion (10) of the lens holder 14 about the optical axis of the optical axis. The inner and outer lens holders 14 β are detached from each other by a deadener or the like. The lens reaping unit 1G includes a power supply member % disposed between the lower woven fabric (the rear side elastic cymbal h and the earth seat member (drive base) 12. The supply member 32 is for supplying electric power to the drive coil 16. '. The power supply member 32 is affixed between the lower leaf spring 24 and the base member 12, and is flexibly printed with a pair of lead wires (not shown) of the drive coil 16. a circuit board 322; and an elastic sheet metal terminal 324 extending downward from the flexible printed circuit board 322 to the cymbal substrate. The magnetic field of the permanent magnet 18 is utilized by energizing the drive coil 16 by the power supply member 32. The 15/26 201221797 generated by the current flowing through the driving coil 16 can be used to align the lens holder i4 (lens assembly) in the light (four) direction. In the above lens driving device 10, the lens element is held. The lens 竿μ spot=the combination of the movable coil 16 is a columnar movable portion 14 disposed at the center portion, the magnetic cymbal, the base member (drive base) 12, the permanent magnet 18, the ridge, and the cover 28 are combined. As configured in the movable portion 14, The outer peripheral fixing portions 12, 18, 20, 28 of 6 work. Next, in "3" and Fig. 4, the structure of the present invention ===spring 24 will be described in detail. Fig. 3 is the lower side sapphire 24 In a plan view, the main portion of the side plate spring 24 of the side view of the side plate is enlarged and lowered (the rear side spring) 24 has a lower inner peripheral side end portion 24 of the lens end as will be described later; The four lower arm portions provided in the circumferential direction of the lower outer peripheral side end end of the member (drive base member) 12 are annularly formed on the lower inner peripheral side. The lower outer peripheral side end portion 2 The lower side end portion of the lower side is provided to be spaced apart from the outer side in the radial direction. The armor side end portion 242 has a larger half than the lower inner peripheral side end portion 241: the lower gamma IT arm portion 243 is circumferentially The four lower inner peripheral side connecting portions 244 that connect the lower inner peripheral side end portion 241 side end portion 2 Γ ▲ are protruded from the lower inner peripheral 邛 242 * ° from the outer side. The end connecting portion 245 ′′ and the 邙 242 protruded toward the inner side in the direction of the diameter. The cyanine 24 is not shown in the figure. The lens holder 14 has a lower end at the lower end thereof for the subscript. Plate 'supporting four inner peripheral portion side 241 of the lower end 144. 16/26

S 201221797 The four lower inner peripheral side connecting portions 244 have openings 244a for attaching the lower inner peripheral side end portions 241 to the four supporting portions 144 of the lens holder i 4 . In the lower side leaf spring 24 of the present embodiment, the lower inner peripheral side end portion 241 has a buffering portion 24a at a position between the adjacent lower inner peripheral side connecting portions 244, as shown in FIG. The buffer displacement portion 24 a is in a meander shape. On the other hand, in the associated lower leaf spring 24 (see Fig. 5), the displacement portion 241a is not provided. Therefore, in the associated lower side leaf spring 24, the lower inner peripheral side end portion 241 and the lower side arm portion 2 are deformed in the drop test of the convertible small camera. Since the lower side of the present embodiment has four cushion displacement portions 241a, it is possible to prevent the lower inner peripheral side end portion 241 and the lower side arm portion 243 from being deformed in the drop test of the convertible compact camera. Next, in order to further understand the effect of the lower side panel 24 of the first embodiment of the present invention, the problem of the associated lower side leaf spring 24 will be described with reference to Fig. 5'. 3 is a perspective view showing a state in which the lower inner peripheral end portion 242 of the lower side leaf spring 24 is attached to the lower end side of the lens holder 13. The associated lower leaf spring 24' has the same structure as the lower leaf spring 24 shown in Fig. 3 except that it does not have the cushion displacement portion 24u. The lower inner peripheral side end portion 24 of the associated lower side leaf spring 24 is fixed to the lower end of the lens holder 14 as will be described later. First, the four support portions 144 provided at the lower end of the lens holder 14 are intended to be provided in the openings 244a of the four lower internal joint portions 244. After that, the four branch buildings are 144. Thereby, the lower inner peripheral side end portion 241 of the associated lower side leaf spring 24 is fixed to the lens holder 14 end. Therefore, the lower side cyanine 24 associated with the "hot melt application" is fixed in the direction of the optical axis of the lifter frame 14 as it is raised and lowered. Brother 17/26 201221797 Gap (t, in the lateral direction (radial), in the associated lower side leaf spring 24, there is a frame 14, "° through the drop impact test of the collapsible compact camera, the figure is applied in the lens striker The impact of the arrow A in the direction indicated by the arrow A. The arm portion 243 is in the direction indicated by the arrow B in Fig. 5 at the lower inner circumferential side end portion 241 of the associated lower leaf spring 24 in the direction indicated by the arrow B in Fig. 5 . Therefore, the lower inner peripheral side end portion (inner ring portion) 241 is skewed toward the length portion 1. As a result, the lower inner peripheral side end portion (inner ring portion) 241 is as shown in Fig. 5 and arrow C. The ground is moved toward the lower end of the lens holder 14 and the base disposed at a position opposed to the lower side plate 24 is configured to interfere with the base U. Thereby, the lens holder may occur. The safety condition of 14 is inclined with respect to the fixed portion including the base member (driver base) n. In addition, since the posture of the lens holder 14 is inclined, it is possible to have the associated lower side leaf spring 24'. A defective condition in which the characteristics of the lens driving device are deteriorated, or due to contact with the base member 12 by the lower leaf spring 24, In the lower side leaf spring 24 of the present embodiment, the lower inner peripheral side & 4 (inner ring portion) 241 is adjacent between the adjacent lower inner peripheral side connecting portions 244. The buffer displacement portion 241a is provided in one place. (Therefore, the inventors of the present invention confirmed that the lower inner peripheral side end portion (inner ring portion) 241 is not deformed in the drop test of the compact type small camera. Therefore, it is possible to prevent the lower inner peripheral end portion (inner ring portion) 241 from coming into contact with the base member (drive benefit base) 12. As a result, it is possible to improve the characteristic deterioration of the lens driving device and also prevent dust accumulation. As shown in Fig. 3, the lower leaf spring 24 of the above-described embodiment is connected to the lower inner circumferential side end portion (inner ring portion) 241 only on the adjacent lower inner circumferential side 18/26 201221797 joint portion 244. The buffer displacement portion 241a (in the case of the present example, the four buffer displacement portions 241a) is provided at one place. However, the buffer displacement portion 24 may be provided at a plurality of places between the adjacent lower inner peripheral side connecting portions 244. a. For example, between adjacent lower inner peripheral side connecting portions 244 When the buffer displacement portion 241a is provided at two places, the buffer displacement portion 241a is eight in total. The shape of the buffer displacement portion 241a is of course not limited to the Ω-like impurity as shown in Fig. 4. That is, if it is buffered The shape of the portion which is not deformed by the portion itself, that is, the mouth|portion|symbol, and FIG. 6 (A)-(L), and the modification of the buffer displacement part 241a are shown in FIG. 6 (A), (E), and (1) The shape of the sinus is substantially U-shaped. In addition, the portion 24a shown in Fig. 6 (〇 and (〇) has an S-shaped shape. The slow τ elevation portion 241a shown in Fig. 6(H) is v. The shape of the shape, the figure: more (four) becomes a w-shaped shape. The shape shown in Fig. 6 (8) becomes a curved shape. The buffer displacement portion cell shown in Fig. 6(F) has a shape of a shape, and the buffer displacement portion 241a shown in Fig. 6 (6) has a transition portion 24ia which is a ring (a circular shape. The _ displacement portion (10) becomes a hollow v" A plan view of the upper side plate upper side plate 22 of the embodiment. The frame === side magazine 22 has the second::=end portion 221 fixed to the lens yoke 20 as described above; The side inner peripheral side end portion 221 and the extension 22222 = in order to connect the four upper arm "upper side" between the two upper side arms, and the circumferential side end side inner side end portion 221 is substantially rounded in the circumferential direction of the 9/26 201221797 ring shape. The upper outer peripheral side end portion 222 is provided away from the upper inner peripheral side end portion in the radial direction outer side. The upper outer peripheral side end portion 222 of g卩' has a larger radius than the upper inner peripheral side end portion 221. Each arm milk protrudes in the circumferential direction. The four upper inner peripheral side connecting portions 224 that connect the upper inner peripheral side end portion 221 and the four upper side arm portions of milk are protruded outward in the radial direction from the upper inner peripheral side end portion 221 . The four upper outer peripheral side connecting portions 225 that connect the upper outer peripheral side end portion 222 and the four upper side arm portions are protruded from the upper outer peripheral side end portion 222 toward the inner side in the radius ' direction. In the upper leaf spring D of the present embodiment, the four upper outer peripheral side connecting jaws 225 have a shape that is curved from the upper outer peripheral side end portion 222 toward the root portions of the four upper arm portions. Since the upper side plate 22 of the present embodiment has the curved outer peripheral side peripheral connecting portion 2, it is possible to release the stress generated in the drop-type test of the compact camera, and specifically, it can be dispersed and concentrated on the upper side. The stress at the root of the arm portion 224. In other words, it is possible to reduce the bending stress from being concentrated on the root of the upper arm portion 223. As described above, according to the present embodiment, the financial impact resistance of the upper side platen 22, the lower side leaf spring 24, and the lens driving device ι can be further improved. The present invention has been described above by way of preferred embodiments, but those skilled in the art can perform various changes/for example, in the above-described embodiments, four arms are connected to the inner circumference. Between the side end portions 221 and 241 and the outer peripheral side end portions 222 and 242, generally, the inner circumferential side end portions 221 and 241 and the outer peripheral side end are connected to each other by a portion (an integer of NU or more). twenty four

Leaf spring. U [Simple diagram description] 20/26

S 201221797 FIGS. 1(A) to 1(C) are diagrams showing a lens driving device according to an embodiment of the present invention, wherein FIG. 1(A) is a plan view of the lens driving device, and FIG. 1(B) is a front view of the lens driving device. Figure 1 (C) is a right side view of the lens drive skirt. Fig. 2 is an exploded perspective view of the lens driving device shown in Figs. 1 (A) to (C). Fig. 3 is a plan view of a lower leaf spring according to an embodiment of the present invention. Fig. 4 is an enlarged plan view showing, in an enlarged manner, a main portion of the lower leaf spring shown in Fig. 3; Fig. 5 is a perspective view showing a state in which the lower inner circumferential side end portion of the associated lower leaf spring is attached to the lower end side of the lens holder. 6(A) to 6(L) are diagrams showing a modified example of the buffer displacement portion shown in Fig. 4. Figure 7 is a plan view of the upper side panel yellow of one embodiment of the present invention. [Description of main component symbols] 10 Lens driving device 12 Base member (drive base) 12a Circular opening 120 Base portion 122 Projection 124 Projection 124-1 Projection 124-la Front end portion 124-lb Lower end 14 Lens Rack 140 cylindrical portion 21/26 201221797 140-1 contact portion 142 female thread 144 support portion 16 drive coil 162 flat portion 18 permanent magnet 182 permanent magnet piece 184 of cross section triangular shape rectangular permanent magnet piece 20 magnetic glory 202 outer tube Part (Shield yoke) 202-1 Central portion 204 Annular end 204a Embedding hole 206 Inside vertical extension (Back yoke) 22 Upper side leaf spring (Front side magazine) 221 Upper side inner circumference Side end portion (inner ring portion) 222 Upper side outer peripheral side end portion (outer ring portion) 222a Through hole 223 Upper side arm portion 224 Upper side inner peripheral side connecting portion 225 Upper side outer peripheral side connecting portion 24 Lower side leaf spring (rear side spring) 241 Side inner peripheral side end portion (inner ring portion) 241a Buffer displacement portion 242 Lower side outer peripheral side end portion (outer ring portion) 242a Through hole 22/26 201221797 243 Lower side arm portion 244 Lower side inner peripheral side connecting portion 244a Opening 245 Lower side outer peripheral side connecting portion 26 Limiter 28 Cover 28a Circular opening portion 282 Projection 30 Pad 30a Inserting hole 32 Power supply member 322 Flexible printed circuit board 324 Sheet metal terminal 34 Ring plate 0 Optical axis (central axis) s 23/26

Claims (1)

201221797 VII. Patent application scope: In the 2#, the column-shaped movable portion that is to be straightened at the center portion is positioned on the inner circumference side of the special annular shape with the axial direction displacement of the above-mentioned leaf spring with respect to the central portion 7_^ The outer peripheral side end provided on the inner peripheral side end portion of the inner peripheral side end portion in the radial direction outer side A k the outer peripheral side end portion in the radial direction inner side protruding portion and the upper jaw arm portion In the case of the external connection, the r N is an integer of 2 or more, and (4) at least 2. between the upper side of the discussion. 3. There is a leaf spring of the I::,: The side connecting portion has an opening to which the end portion of the It ^ circumference side is attached to the movable portion. 4. The leaf spring of the first season of the makeup season 2, wherein the cushion displacement portion is selected from any of a large ^ * Ω shape and an S shape. The material of the material is a leaf spring of any one of the above, wherein the upper plate is connected to the upper side of the fixing portion on the upper side thereof; and 24/26 S 5. 201221797 箬, the above, /, the above solid portion The lower side plate connected to the lower side thereof is characterized in that the lower leaf spring has an annular lower inner circumferential side end portion of the lower end of the lens holder, and a side two-two fixed portion. The lower inner peripheral side end portion is provided on the lower outer peripheral side end portion in the radial direction outer side opening, and the lower inner peripheral side end portion and the lower outer peripheral side end portion are described as follows. The lower side arm portion of the strip; the inner peripheral side end portion of the μ2 side protrudes outward in the radial direction, and the connecting side is connected: the inner end: the end portion and the N lower inner circumferences of the N lower arm portions The side end portion is provided to the inner side u in the radial direction, and the side joint portion = the outer peripheral side end portion and the above-mentioned lower arm portion _ the lower outer circumference portion, where N is an integer of 2 or more, and the inner peripheral end portion of the 6 ΐ ΓΓ 在 is adjacent The lower inner peripheral side connecting portion has a scoop to: >, one has a buffer displacement portion. The lens driving device of the fifth aspect, wherein the lens is configured to support a lower inner peripheral side end of the lower side leaf spring; and the one lower side closing side connecting portion has a tangential portion for facilitating the lens The lens driving device according to the fifth aspect of the invention, wherein the shifting k is substantially U-shaped, Ω-shaped, or s-shaped. The upper side leaf spring of the lens driving device of any one of the items of the fifth to seventh aspect of the present invention has: the upper end inner circumferential side end portion of the upper end of the 25/26 S 8·201221797; =::: the side end portion To the outer side of the radial direction = the upper side arm of the purlin which is arranged in the circumferential direction by the red side (four) turn; and the upper side of the upper side from the upper side of the upper side to the upper side of the upper side and the upper side of the upper part: : The upper outer peripheral side end portion is formed on the radius side, the second upper side: the outer peripheral side end portion, and the above-mentioned increasing portion = upper:: week is the upper side outer peripheral side end material 9. wherein Ν is an integer of 2 or more. =? 5 to 8 of the lens drive unit of any one, the vertical 2 is dumped on the shameless spring (four) from high hardness non-scale steel 26/26 S