JP2013242447A - Micro-lens focus structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a micro-lens focus structure.SOLUTION: A micro-lens focus structure comprises: a casing with an upper plate able to define an internal space after combined with a bottom plate; a lens sheet whose periphery is covered with coils; and at least one elastic member that sandwiches the lens sheet in the internal space in a suspending position and does not contact with the upper plate and the bottom plate. When not driven, the elastic member is not subject to tensile force. Therefore, the micro-lens focus structure saves more power compared to a known VCM focus structure, reduces the inclination angle of a lens during focus drive, and further reduces component costs.

Description

  The present invention relates to a type of microlens focus structure, and more particularly to a type of microlens focus structure using a voice coil motor (hereinafter abbreviated as VCM).

  Advances in science and technology have reduced the volume of digital cameras to a fairly small size, and most current mobile phones also have built-in functions for digital cameras, both thanks to the modularization and micronization of imaging lenses. There are many types of autofocus drive structures in the microlens. Currently, the most popular is the VCM. Its volume is small, power consumption is low, the actuator is accurate, and the price is low. Suitable for short distance driving of micro lens autofocus due to its advantages.

  1 and 2 are a three-dimensional exploded view of a known VCM focus structure and a local enlarged three-dimensional view thereof. The VCM focus structure 10 moves with the lens set 100 mounted thereon, and causes the lens set 100 to focus a subject on a photosensor (not shown). The known VCM focus structure 10 includes a casing 11 and a base cover 12, and a lens mounting mechanism 20 is provided in the casing 11, and is used for mounting and moving the lens set 100. The lens mounting mechanism 20 is connected to the inner upper end of the casing 11 and the inner surface of the base cover 12 by using two upper and lower elastic pieces 13, and the lens mounting mechanism 20 also includes a mounting sheet 21. In addition, the outer periphery of the mounting sheet 21 is covered with a coil 22, and magnets 14 are provided on the inner four sides of the casing 11, and these magnets 14 are fixed by a magnet frame 15. When the coil 22 is energized, an electromagnetic field is generated, an attracting force is generated with the magnet 14, and the mounting sheet 21 is pushed up and down to perform a focusing operation.

  As shown in FIG. 2, in the known VCM focus structure 10, the inner surface of the base cover 12 has a stepped shape, and the fixing portion 13 ′ of the lower elastic piece 13 is connected to the inner surface of the base cover 12, The movable portion 13 ″ of the lower elastic piece 13 is connected to the bottom surface of the placement sheet, and a height gap L is formed between the fixed portion 13 ′ of the lower elastic piece 13 and the movable portion 13 ″. The lens placement mechanism 20 utilizes the tensile elasticity of the movable portion 13 ″ of the lower elastic piece 13 to bring the placement sheet 21 closer to the upper surface of the base cover 12, whereby the lower elastic piece 13 is The lower elastic piece 13 can generate a pre-pressure due to the difference in the pulled height L. For this reason, the lens mounting is performed using a relatively large amount of electric power. By driving the mechanism 20, the mechanism cannot be driven without canceling the pre-pressure of the lower elastic piece 13. Fig. 3 is a driving current characteristic curve display diagram of a well-known VCM focus structure. A current of 30 mA is required because the known VCM focus structure must rely on the magnetic force of four magnets in order to enhance the attracting and rejecting drive force of the induction coil electromagnetic force.

  Also shown in FIG. 4 is a diagram showing the operating tilt characteristics of a known VCM focus structure. Since the placement sheet 21 contacts the surface of the base cover 12, the contact surface between the upper and lower elastic pieces and the base cover or the upper cover is sufficiently flat at the moment when the placement mechanism 20 is driven to perform focusing. Non-uniformity in tensile elasticity is caused, so that the mounting sheet 21 can generate an inclination of about 20-23 minutes (1 degree = 60 minutes) (not necessarily 20-23 minutes), As a result, the usable analysis level decreases. For example, when the inclination of the lens is about 20 minutes, the analysis degree can use only 5 million pixels, and when the inclination decreases to 5 minutes, An analytical lens can be used.

  The object of the present invention is a microlens focus that is more power saving than the known VCM focus structure and can reduce the tilt angle of the lens when driving the focus, and the focus is speedy, thereby improving the focus analysis and reducing the component cost. To provide a structure.

  In order to achieve the above-mentioned object, the microlens focus structure of the present invention includes a casing that can be formed with an inner space after being combined with a bottom plate, a lens sheet that is covered with a coil, and an upper plate that penetrates the center. A non-movable portion and a movable portion, the non-movable portion being connected to the upper plate or the bottom plate, the lens sheet being sandwiched in an internal space formed by the casing and the bottom plate, and And an elastic member that does not contact the upper plate and the bottom plate, so that the elastic member is suspended in an undriven state.

The invention of claim 1 is the microlens focus structure,
A casing comprising an upper plate having an opening at the center and forming an internal space in combination with a bottom plate;
A lens sheet whose outer periphery is coated with a coil;
At least one elastic member, each elastic member comprising a non-movable part and a movable part, the movable part being connected to the lens sheet, the non-movable part being connected and fixed to the top plate or the bottom plate, The lens sheet is sandwiched in an internal space formed by combining the casing and the bottom plate, and is not in contact with the top plate and the bottom plate, so that the lens sheet is suspended in an undriven state. And at least one elastic member,
The microlens focus structure is characterized by including the above.
According to a second aspect of the present invention, in the microlens focus structure according to the first aspect, the movable portion of the elastic member is connected to the lens sheet, and the non-movable portion of the elastic member is connected to the casing. And a microlens focus structure.
According to a third aspect of the present invention, in the microlens focus structure according to the first aspect, the movable portion of the elastic member is connected to the lower end of the lens sheet, and the non-movable portion of the elastic member is connected to the bottom plate. The microlens focus structure is characterized by the following.
According to a fourth aspect of the present invention, in the microlens focus structure according to the first aspect, the magnetic lens further includes at least one magnetic element, the magnetic element is magnetically adsorbed on the inner wall surface of the casing, and the coil of the lens sheet. The microlens focus structure is characterized in that it is non-contact.
The invention according to claim 5 is the microlens focus structure according to claim 1, wherein the elastic member is
A first elastic member comprising an immovable part and a movable part, the movable part of the first elastic member being connected to the upper end of the lens sheet, and the immovable part of the first elastic member being the upper plate The first elastic member connected to
A second elastic member comprising a non-movable portion and a movable portion, the movable portion of the second elastic member being connected to a lower end of the lens sheet, and the non-movable portion of the second elastic member being attached to the bottom plate The second elastic member to be connected;
The microlens focus structure is characterized by including:

  When the microlens focus structure of the present invention is in an undriven state, the elastic member does not receive a pulling force. Therefore, the microlens focus structure is more power saving than the well-known VCM focus structure, reduces the tilt angle of the lens when driving the focus, and Lower part cost.

It is a three-dimensional exploded view of a known VCM focus structure. It is a local enlarged three-dimensional view of a known VCM focus structure. It is a drive current characteristic curve display figure of a known VCM focus structure. It is an operation inclination characteristic display figure of a known VCM focus structure. It is a three-dimensional exploded view of the microlens focus structure of the present invention. It is a cross-sectional side view of the microlens focus structure of the present invention. It is a three-dimensional view of the Example of the elastic member of this invention. It is a drive current characteristic curve display figure of this invention. It is an operation inclination characteristic display figure of the micro lens focus structure of the present invention.

  In order to describe in detail the technical contents, structural features, and objects to be achieved of the present invention, examples will be described below in combination with the drawings.

  FIG. 5 is a three-dimensional exploded view of the microlens focus structure of the present invention, and FIG. 6 is a cross-sectional side view of the microlens focus structure of the present invention. The microlens focus structure 30 of the present invention includes a casing 31, a bottom plate 32, a lens sheet 33, a coil 34, and at least one elastic member.

  Among them, the casing 31 includes an upper plate 311 having an opening shape through which the center passes, and the upper plate 311 and the casing 31 are integrally formed, and the four peripheral edges of the upper plate 311 are raised toward the center. The casing 31 forms an internal space after being combined with the bottom plate 32, and the four peripheral portions of the bottom plate 32 have a stepped shape that is recessed toward the center.

  The center of the lens sheet 33 has an opening shape and can accommodate a lens assembly (the mounting sheet 21 and the lens set 100 shown in FIG. 1). In this embodiment, as shown in FIG. A lens set is integrally formed, and the outer periphery of the lens sheet 33 is covered with the coil 34.

  Further, as shown in FIG. 5, the microlens focus structure of the present invention further includes at least one magnetic element 36, magnetically attracts to the inner wall surface of the casing 31, and corresponds to the coil 34 of the lens sheet 33. However, it is not contacted, and preferably, the two magnetic elements 36 are provided and arranged so as to correspond to both sides of the coil 34, but are not contacted with the coil 34.

  Please refer to FIGS. 6 and 7 together with FIG. FIG. 7 is a three-dimensional view of an embodiment of the elastic member of the present invention. Among them, the elastic member 35 includes a movable portion 353 and a non-movable portion 354. The movable portion 353 of the elastic member 35 is connected to the lens sheet 33, the non-movable portion 354 of the elastic member 35 is connected and fixed to the upper plate 311 or the bottom plate 32, and the lens sheet 33 is attached to the casing 31 and the casing 31. It is held in a suspended state in the internal space formed by the bottom plate 32.

  Preferably, the first elastic member 351 and the second elastic member 352 of the elastic member 35 each include an immovable part and a movable part.

  The non-movable part of the first elastic member 351 is connected and fixed to the upper plate 311, the movable part is connected to the upper end of the lens sheet 33, and the non-movable part of the first elastic member 351 is the non-movable part of the casing. 31 is connected to the lowest part of the inner surface of the upper plate 311, thereby forming a distance between the lens sheet 33 and the highest part of the inner surface of the upper plate 311.

  The movable part of the second elastic member 352 is connected to the lower end of the lens sheet 33, and the non-movable part of the second elastic member 352 is connected to the highest part of the inner surface of the bottom plate 32, whereby the lens sheet 33 and a minimum portion of the inner surface of the bottom plate 32, and a lens sheet 33 is formed between the casing 31 and the bottom plate 32 using the first elastic member 351 and the second elastic member 352. It is sandwiched in an internal space formed by and is not in contact with the upper plate 311 and the bottom plate 32.

  Thus, when the microlens focus structure of the present invention is in an undriven state, the movable portion of the elastic member 35 does not receive any pre-tension force.

  However, only one elastic member 35 of the present invention may be used, and when only the first elastic member 351 is used or only the second elastic member 352 is used, the structure and connection relationship thereof are both Since this is the same as described above, a duplicate description is omitted here.

  Further, FIG. 8 is a drive current characteristic curve display diagram of the present invention. FIG. 9 is a focus structure operation tilt characteristic display diagram of the present invention. In the present invention, when the lens sheet 33 is held in a suspended state by using the elastic member 35, the elastic member 35 does not have any pre-pressure, and therefore is driven when the driving current is lower than 10 mA. Compared with the case where the focus structure requires a drive current of 20 to 30 mA, power can be saved more. From FIG. 9, the focus structure of the present invention has a preload when driven and when the focus is executed. Therefore, the inclination of the lens sheet 33 is maintained at less than 5 minutes, much better than exceeding the well-known 20 minutes, and less for camera lenses that require increasingly higher resolution. As the degree of analysis of lens focus increases, the present invention makes a significant contribution.

  Taken together, the present invention ensures that the above-described technique provides a design that is clearly different from the known ones, increasing the overall value of use, and has not been found in publications prior to its filing and is also available for public use. It is not up to the patent requirements, and so it is up to you to apply for a patent here.

  However, what has been described above is merely an example of the present invention, and does not limit the scope of the present invention, and any equivalent changes and modifications that can be made based on the scope of the claims of the present invention. It belongs to the scope covered by the rights of the present invention.

DESCRIPTION OF SYMBOLS 10 VCM focus structure 100 Lens set 11 Casing 12 Base cover 13 Elastic piece 14 Magnet 15 Magnet frame 20 Lens mounting mechanism 21 Mounting sheet 22 Coil 30 Lens focusing structure 31 Casing 311 Top plate 32 Bottom plate 322 Convex lump 33 Lens sheet 34 Coil 35 elastic member 351 first elastic member 352 second elastic member 353 movable portion 354 non-movable portion 36 magnetic element

Claims (5)

In the micro lens focus structure,
A casing comprising an upper plate having an opening at the center and forming an internal space in combination with a bottom plate;
A lens sheet whose outer periphery is coated with a coil;
At least one elastic member, each elastic member comprising a non-movable part and a movable part, the movable part being connected to the lens sheet, the non-movable part being connected and fixed to the top plate or the bottom plate, The lens sheet is sandwiched in an internal space formed by combining the casing and the bottom plate, and is not in contact with the top plate and the bottom plate, so that the lens sheet is suspended in an undriven state. And at least one elastic member,
A microlens focus structure comprising:   2. The microlens focus structure according to claim 1, wherein the movable portion of the elastic member is connected to the lens sheet, and the non-movable portion of the elastic member is connected to the casing. .   2. The microlens focus structure according to claim 1, wherein the movable part of the elastic member is connected to a lower end of the lens sheet, and the non-movable part of the elastic member is connected to the bottom plate. Focus structure.   2. The microlens focus structure according to claim 1, further comprising at least one magnetic element, the magnetic element being magnetically adsorbed on the inner wall surface of the casing, and corresponding to a coil of the lens sheet but not in contact therewith. A microlens focus structure characterized by being. The microlens focus structure according to claim 1, wherein the elastic member is
A first elastic member comprising an immovable part and a movable part, the movable part of the first elastic member being connected to the upper end of the lens sheet, and the immovable part of the first elastic member being the upper plate The first elastic member connected to
A second elastic member comprising a non-movable portion and a movable portion, the movable portion of the second elastic member being connected to a lower end of the lens sheet, and the non-movable portion of the second elastic member being attached to the bottom plate The second elastic member to be connected;
A microlens focus structure comprising:

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