JP4654359B2 - Manufacturing method of lens driving device - Google Patents

Description

  The present invention relates to a method for manufacturing a lens driving device.

  Patent Document 1 discloses a lens driving device in which a lens support provided with a lens body and a spring that swingably supports the lens support are incorporated in a housing. In such a lens driving device, a lens support and a spring are assembled in a housing, and then the lens is screwed and fixed to the lens support.

JP 2004-280031 A

  However, in the prior art described in Patent Document 1 described above, the lens support is only supported by the housing with a spring. Therefore, when the lens body is screwed and fixed to the lens support, it is interlocked with the screwing operation. There is a possibility that the lens support may rotate, and the spring may be deformed by the rotation of the lens support.

  An object of the present invention is to obtain a method of manufacturing a lens driving device that can prevent deformation of a spring when a lens body is assembled to a lens support.

In order to solve the above-mentioned problems, the invention described in claim 1 is directed to a lens driving device for fixing a lens body to a lens support body after the lens support body is swingably attached to a housing via a spring. In the manufacturing method, the spring is an annular plate spring in plan view, and includes an inner ring attached to the lens support side, an outer ring attached to the housing side, and a plurality of arms that connect the inner ring and the outer ring. After the lens support and the spring are assembled in the housing , the pin is fitted into the insertion portion formed between the insertion portion of the housing and the arm portion of the spring to rotate the lens support relative to the housing. Then, the lens body is screwed into the lens support, and the lens body is fixed to the lens support.

The invention described in claim 2 is the invention according to claim 1 , wherein the pin is fixed to the pedestal, and the pedestal is formed with a lens insertion hole communicating with the lens mounting hole of the lens support, The inner diameter of the lens insertion hole is almost the same as the outer diameter of the lens body. After placing the pedestal on the top surface of the housing and fitting the pins into the insertion portion of the housing and the insertion portion of the spring, the lens body is inserted into the lens. It is inserted into the hole and screwed into the lens support.

According to the first aspect of the present invention, when the lens driving device is manufactured, the pin is fitted into the insertion portion of the housing and the insertion portion of the spring to restrict the rotation of the lens support relative to the housing. The lens support is difficult to rotate in the rotation direction in conjunction with the screwing operation of the lens body. Therefore, no force is applied to the spring, and the spring can be prevented from being twisted and broken.

  Since the lens body is screwed and fixed to the lens support body, it is possible to easily adjust the position of the lens body in the optical axis direction only by adjusting the screwing amount.

In the spring, since the insertion part is provided between the arm parts, the arm part is not disturbed, and the pin insertion part can be secured.

Since the inner ring and the outer ring are connected by the arm part, the arm part is easily deformed when a large twist is applied in the rotational direction of the spring, but the area of the insertion part of the pin can be widened. stiffness is increased, the spring pins when inserting portion of the spring when the outer ring to the inner ring is twisted in the rotational direction occurs can be prevented from deformation.

According to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and the inner diameter of the lens insertion hole is substantially equal to the outer diameter of the lens body. Since the lens body is screwed after being inserted into the lens body, the insertion angle of the lens body is not easily shifted obliquely with respect to the optical axis direction, and the lens body can be screwed smoothly into the lens support.

  By simply placing the pedestal on the upper surface of the housing, the pin fits into the insertion portion of the spring, so that the pin insertion work is easy.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a view showing a method for manufacturing a lens driving device according to the present embodiment, and is a longitudinal sectional view showing a state in which a pedestal is placed on the upper surface of the housing. FIG. 2 is a diagram of the lens driving device according to the present embodiment. It is a figure which shows a manufacturing method, and is a perspective view which shows the state before mounting a base on the upper surface of a housing | casing, FIG. 3 is a figure which shows the manufacturing method of the lens drive device which concerns on this Embodiment, and is on the upper surface of a housing | casing. 4 is a perspective view showing a state before the pedestal is mounted and the lens body is screwed, FIG. 4 is a plan view showing the spring of the lens driving device shown in FIG. 5, and FIG. 5 is an exploded perspective view of the lens driving device according to the present embodiment. FIG.

  The lens driving device 1 according to the present embodiment is incorporated in an autofocus lens of a cellular phone, and includes a substantially cylindrical yoke 3, a casing (base 5, frame 6) on which the yoke 3 is mounted, and the yoke 3. A lens support 7 disposed on the inner peripheral side of the lens, a coil 10 disposed on the outer peripheral side of the lens support 7, and a front spring 9 and a rear spring 11 disposed in the front-rear direction of the lens support 7. I have.

  The yoke 3 has a substantially U-shaped cross section, and a ring-shaped magnet 13 is disposed in the U-shape. The magnet 13 has a ring shape and is divided into four arc-shaped blocks along the circumferential direction.

  The base 5 is made of resin, and includes a substantially flat base portion 5a and base-side connection portions 5b provided upright at four corners of the base portion 5a.

  The frame 6 is made of resin and includes a substantially flat upper wall portion 6a and frame-side connecting portions 6b provided upright at four corners of the upper wall portion 6a. Furthermore, a circular opening 6d is formed in the upper wall 6a, and a cap 15 attached to the lens support 7 is located at the position of the opening 6d. Further, a substantially arc-shaped recess 6e is formed in the opening 6d, and the rotation-preventing pin 23 is inserted through the recess 6e of the opening 6d and the recess 15a formed in the cap 15. An insertion hole (insertion portion) 14 is formed.

  The front spring 9 is a substantially annular leaf spring in plan view, and is provided with an inner ring 9a and an outer ring 9b. The inner ring 9a has an annular shape, the outer ring 9b has an annular shape with a radius larger than that of the inner ring 9a, and a plurality of arm portions 9c are provided between the inner ring 9a and the outer ring 9b. ing. The arm portions 9c are provided at intervals in the annular direction of the front spring 9, and an insertion portion 9d for the pin 23 is provided between the arm portions 9c. A substantially semicircular cutout is formed in the insertion portion 9d, and the pin 23 is fitted in this portion. The insertion portion 9d is provided so as to protrude outward in the radial direction, and the outer ring 9b has a shape that is recessed outward in the radial direction as the insertion portion 9d protrudes.

  The inner ring 9 a of the front spring 9 is fixed by being sandwiched between the lens support 7 and the cap 15, and the outer ring 9 b is between the yoke (outer yoke 3 a and inner yoke 3 b) fixed to the base 5 and the frame 6. It is sandwiched between and fixed. A front spacer 17 is interposed between the outer ring 9 b and the yoke 3.

  The rear spring 11 is a plate spring having a substantially circular shape in plan view, the inner ring 11a is formed in an annular shape, the outer ring 11b is formed in an annular shape having a larger radius than the inner ring 11a, and the inner ring 11a and the outer ring are formed. A plurality of arm portions 11c are provided between 11b and 11b. The arm portions 11 c are provided at intervals in the annular direction of the rear spring 11. The inner ring 11 a is fixed to the rear end in the optical axis direction of the lens support 7, and the outer ring 11 b is fixed between the base portion 5 a of the base 5 and the rear spacer 19.

  The lens support 7 has a substantially annular shape, and the lens body 12 is fixed to the lens mounting hole 7a therein. A screw groove 7b is formed in the lens mounting hole 7a. A thread 12 a is formed on the outer periphery of the lens body 12, and an engaging portion 12 b that engages an engaged portion 35 of the screwing jig 30 is provided on the front side of the lens body 12.

  Next, a jig used when manufacturing the lens driving device 1 will be described. The jig used at the time of manufacture is a rotation restricting jig 20 for restricting the rotation of the lens support body 7 when the lens body 12 is screwed into the lens support body 7, and a screwing jig for screwing the lens body 12 into the lens support body 7. 30.

  The rotation restricting jig 20 includes a pedestal 21 placed on the upper surface of the frame 6, three pins 23 projecting downward from the pedestal 21, and a guide 22 fitted into the inner periphery of the lens support 7. The pedestal 21 is formed with a lens insertion hole 25 communicating with the lens mounting hole 7a. The inner diameter (W2) of the lens insertion hole 25 is substantially equal to the outer diameter (W1) of the lens body 12.

  The screwing jig 30 includes an engaged portion 35 that engages with the engaging portion 12b of the lens body 12, an attachment portion 33 of the engaged portion, and a rotating portion 31 that applies rotational torque to the engaged portion 35. The lens body 12 engaged with the engaged portion 35 by rotating the rotating portion 31 is screwed into the lens mounting hole 7a of the lens support 7.

  Next, the manufacturing method and operation effect of the lens driving device according to this embodiment will be described. To assemble the lens driving device 1, first, the rear spring 11 is attached to the lens support 7, the magnet 13 and the coil 10 fixed to the lens support 7 are arranged inside the yoke 3, and the base portion of the base 5. 5a is assembled via a rear spacer 19. The inner ring 9 a of the front spring 9 is placed between the front spacer 17 and the yoke 3 and fixed with the cap 15, the frame 6 is attached to the base 5, and the outer ring 9 b of the front spring 9 is attached to the frame 6. Fix it.

Next, the lens body 12 is fixed to the lens support 7. In this case, first, as shown in FIG. 2, the rotation restricting jig 20 is placed on the upper surface of the frame 6, and the pin 23 is inserted and fitted into the insertion portion 14 and the insertion portion 9 d of the front spring 9. Thereafter, the lens body 12 is inserted into the lens insertion hole 25 of the base 21, and the engaged portion 35 of the screwing jig 30 is engaged with the engaging portion 12b of the lens body 12 and rotated by a predetermined amount in the direction of the arrow in the figure. Then, the lens body 12 is screwed and fixed to the lens support 7. After the lens body 12 is fixed, the rotation restricting jig 20 is removed and the assembly of the lens driving device 1 is completed.

In the present embodiment, when the lens driving device 1 is manufactured, the pin 23 is fitted into the insertion hole 14 of the frame 6 and the insertion portion 9d of the front spring 9 to restrict the rotation of the lens support 7 with respect to the frame 6. Therefore, it is difficult for the lens support 7 to rotate in the rotation direction in conjunction with the screwing operation of the lens body 12. Therefore, no force is applied to the front spring 9 and the rear spring 11, and even when a spring that is easily deformed, such as an annular leaf spring, is used, the spring can be prevented from being twisted and broken.

  Since the lens body 12 is screwed and fixed to the lens support body 7, the assembly is easier than in the case of adhesive fixing.

  Since the lens body 12 is screwed and fixed to the lens support 7, the position of the lens body 12 in the optical axis direction can be easily adjusted only by adjusting the screwing amount.

  Since the insertion portion 9d is provided between the arm portions 9c, the arm portion 9c is not disturbed, and the insertion portion 9d of the pin 23 can be easily secured.

  Since the inner ring 9a and the outer ring 9b are connected by the arm portion 9c, the arm portion 9c is easily deformed when a large twist is applied in the rotational direction of the front spring 9, but the area of the insertion portion 9d of the pin 23 is increased. Therefore, the rigidity of the insertion portion 9d can be increased, and when the outer ring 9b is twisted in the rotational direction with respect to the inner ring 9a, the front spring 9 can be prevented from being deformed by hitting the pin insertion portion 9d.

  The inner diameter of the lens insertion hole 25 of the rotation restricting jig 20 is substantially equal to the outer diameter of the lens body 12, and the lens body 12 is screwed after the lens body 12 is inserted into the lens insertion hole 25 of the base 21. The insertion angle is not easily shifted obliquely with respect to the optical axis direction, and the lens body 12 can be smoothly screwed into the lens support 7.

By simply placing the pedestal 21 on the upper surface of the frame 6, the pin 23 is fitted into the insertion portion 14 of the frame 6 and the insertion portion 9 d of the front spring 9, so that the insertion work of the pin 23 is easy.

  Needless to say, the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the scope of the invention.

  The lens driving device 1 is not limited to a camera related to a mobile phone, but may be used for a digital camera.

It is a figure which shows the manufacturing method of the lens drive device which concerns on this Embodiment, and is a longitudinal cross-sectional view which shows the state which mounted the base on the upper surface of the flame | frame. It is a figure which shows the manufacturing method of the lens drive device which concerns on this Embodiment, and is a perspective view which shows the state before mounting a base on the upper surface of a flame | frame. It is a figure which shows the manufacturing method of the lens drive device which concerns on this Embodiment, and is a perspective view which shows the state before mounting a base on the upper surface of a flame | frame and screwing a lens body. It is a top view which extracts and shows the spring of the lens drive device shown in FIG. It is a disassembled perspective view of the lens drive device concerning this embodiment.

1 Lens drive device 5 Base (housing)
6 frame (housing)
7 Lens support 7a Lens mounting hole 9 Front spring (spring)
9a Inner ring 9b Outer ring 9c Arm part 9d Insertion part 12 Lens body 14 Insertion part 21 Base 23 Pin 25 Lens insertion hole

Claims (2)

In a method for manufacturing a lens driving device in which a lens support is attached to a housing through a spring so as to be swingable, and the lens drive is fixed to the lens support, the spring is an annular plate spring in plan view. It is equipped with an inner ring attached to the body side, an outer ring attached to the housing side, and a plurality of arms connecting the inner ring and the outer ring. Is fitted into the insertion portion formed between the insertion portion of the housing and the arm portion of the spring to restrict the rotation of the lens support relative to the housing, and then the lens body is screwed into the lens support, and the lens body is A method for manufacturing a lens driving device, wherein the lens driving device is fixed to a support. The pin is fixed to the pedestal, and a lens insertion hole communicating with the lens mounting hole of the lens support is formed on the pedestal. The inner diameter of the lens insertion hole is substantially equal to the outer diameter of the lens body, and the pedestal is mounted on the housing. The lens body is inserted into the lens insertion hole and screwed into the lens support body after the pin is fitted on the insertion portion of the housing and the insertion portion of the spring. A method for manufacturing the lens driving device according to claim 1 .

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