WO2005040888A1 - 光学モジュール - Google Patents
光学モジュール Download PDFInfo
- Publication number
- WO2005040888A1 WO2005040888A1 PCT/JP2004/015016 JP2004015016W WO2005040888A1 WO 2005040888 A1 WO2005040888 A1 WO 2005040888A1 JP 2004015016 W JP2004015016 W JP 2004015016W WO 2005040888 A1 WO2005040888 A1 WO 2005040888A1
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- WO
- WIPO (PCT)
- Prior art keywords
- lens
- lens holder
- cam
- cylindrical cam
- optical module
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/56—Accessories
- G03B17/561—Support related camera accessories
Definitions
- the present invention relates to an optical module included in a small camera or the like using an image sensor such as a CCD.
- Patent Document 1 discloses a lens driving device 300 that uses a plate cam 310 to reduce the number of sensors and signal processing devices to reduce the size and simplify the configuration. ing.
- the lens position in the optical module is moved.
- the lens position is changed by the rotation of the plate cam 310 about the rotation shaft 311. More specifically, pins 307 and 308 as cam followers are provided on the ball frames (lens holders) 305 and 306, respectively. These pins 307 and 308 are engaged with cam grooves 312 and 313 formed on the cam 310.
- the lens holders 305 and 306 are moved to predetermined positions. Can be set to
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-189165
- the shape (cam curve) of the cam grooves 312 and 313 is defined in consideration of this point.
- the cam curve adjusts the distance between the lens and the CCD to the optimum distance.
- the optical module is manufactured with a predetermined dimensional accuracy. However, in the actual manufacturing process, the relative position in the optical axis direction of the imaging device arranged on the substrate may slightly change, or the lens position or posture may slightly change.
- a plate cam 310 is arranged on one side of the lens holders 305, 306. Is moved in the optical axis direction.
- a load is applied only to the lens holder via the pins 307 and 308, and the optical axis of the lens holder is deviated.
- the optical axis on the lens side is inclined, which causes a problem that the captured image is deteriorated.
- the object is to provide a first lens holder, a second lens holder located on the object side with respect to the first lens holder, and a circumscribed circumscriber of the first lens holder.
- An optical module comprising: a lens barrel slidably held in an optical axis direction; and a cylindrical cam disposed on an outer periphery of the lens barrel and configured to change a position of the first lens holder, wherein the first lens is provided.
- a projection member that also extends the side force of the holder; a through hole is formed in the lens barrel to allow the projection member to move in the optical axis direction; and the projection member is formed on an inner wall of the cylindrical cam.
- a cam surface for guiding to a predetermined position is formed, the second lens holder is fixed to an upper end of the lens barrel, and has a sliding surface for positioning the cylindrical cam in the optical axis direction. Urging the second lens holder toward the sliding surface. It can be achieved by an optical module in which the elastic member is disposed.
- the cylindrical cam that moves the first lens holder is brought into contact with the second lens holder by the elastic member. Since the second lens holder is fixed to the upper part of the lens barrel, the cylindrical cam can be positioned at a desired position in the optical axis direction. Therefore, since the lens included in the optical system can be arranged at a desired position, the back focus can be accurately set.
- the second lens holder has a structure in which the second lens holder is screwed to the upper end of the lens barrel so as to be movable in the optical axis direction.
- the back focus can be easily corrected by moving the second lens holder in the optical axis direction.
- a ring-shaped conical coil panel or a bamboo shoot panel disposed below the cylindrical cam can be employed as the elastic member.
- the installation space can be reduced, and the size of the optical module can be reduced.
- the first lens holder includes a plurality of the protrusion members.
- the provision of the plurality of protrusion members suppresses the inclination of the optical axis of the lens with respect to the optical axis of the substrate. it can . Further, since the lens holder is held by the plurality of projection members, the structure has excellent impact resistance. Note that a plurality of the first lens holders can be provided in the lens barrel.
- the protrusion members are arranged on the side surface of the first lens holder so that the directions are different from each other.
- one lens holder is opposite in a straight line
- the projections are arranged so that the straight lines intersect between different lens holders.
- an optical module having a lens moving mechanism it is possible to provide an optical module that can easily adjust the focus of the lens on the light receiving surface of the light receiving element.
- FIG. 1 is an exploded perspective view showing the inside of an optical module according to an embodiment so that it can be confirmed.
- FIG. 2 is an enlarged view of a third lens holder and a second lens holder shown in FIG. 1.
- FIG. 3 is a diagram showing a cross-sectional configuration of the optical module in a state where the components shown in FIG. 1 are assembled.
- FIG. 4 is an enlarged view showing a state where the cylindrical cam shown in FIG. 3 is divided into two components.
- FIG. 5 is a development view showing a cam groove formed on an inner wall of the cylindrical cam so that the cam groove can be more clearly confirmed.
- FIG. 6 is a view schematically showing a modified example of a cylindrical cam formed by a plurality of cam parts.
- FIGS. 7 (A) and (B) are diagrams showing cam curves (profiles) preferable for defining a cam groove formed on the inner wall of a cylindrical cam.
- FIG. 8 is a diagram showing a driving unit for driving the optical system unit and a cover set on the optical system unit.
- FIG. 9 is a diagram showing an optical module in a completed state in which an optical system unit and a motor are assembled so that a cross-sectional configuration can be confirmed.
- FIG. 10 is a view showing a lens driving device of a conventional small camera.
- FIG. 1 is an exploded perspective view showing the inside of the optical module according to the embodiment so that the inside can be confirmed.
- filters, diaphragms, and the like intervening are not shown so that the characteristic configuration can be easily understood.
- a CCD 2 serving as an image sensor is fixed on a substrate 1 on which a predetermined wiring pattern is formed.
- the substrate for example, a flexible wiring substrate (FPC substrate) can be adopted.
- the optical system unit 3 is arranged so that a photographed image is formed on the CCD 2 arranged on the substrate 1.
- the optical module referred to in the present specification may be a lens and an optical system unit 3 for driving the lens in the optical axis direction LD of the CCD! /, A CCD 2, a substrate 1, and a lens described later. It may be understood that the structure includes an actuator that drives the holder. In the following, the structure included in the optical system unit, preferred for use in the present optical system unit, preferred for manufacturing the cylindrical cam and the optical module! /, And the positioning structure will be described in order.
- the optical system unit 3 includes, from the substrate 1 side, a lens barrel 11, a ring-shaped conical coil spring 12 as an elastic member, a third lens holder 13, a third lens 14, a cylindrical cam 15, a second lens holder 16, and a second lens holder. It includes a lens 17, a first lens 18, and a first lens holder 19.
- the lens barrel 11 has a bottom plate 110 on the bottom side.
- the lens barrel 11 has a substantially cylindrical shape, and is arranged so as to surround the CCD 2 fixed to the substrate 1 as a center.
- An opening (not shown) having a shape corresponding to the shape of the CCD 2 is formed in the bottom plate 110.
- the CCD 2 is fitted into the opening of the bottom plate 110.
- the bottom plate 110 is formed in a disk shape larger than the cylindrical portion of the main body of the lens barrel 11, and its outer peripheral portion projects outward to form a flange portion 115.
- the coil panel 12 is mounted on the flange 115 as described later.
- a plurality of guide grooves 11A-11H are formed on the side wall of the lens barrel 11.
- four guide grooves 11A, 11B, 11E, and 11F are formed as grooves that extend in the optical axis direction LD by partially notching the side wall of the lens barrel 11.
- Other guide grooves are formed on the inner surface of the side wall.
- the four guide grooves 11A, 11C, 11E, and 11G are formed to guide the third lens holder 13.
- the other four guide grooves 11B, 11D, 11F, and 11H are formed to guide the second lens holder 16.
- the coil panel 12 is formed in a ring shape and has a conical shape in which a winding radius is increased toward a lower portion.
- the coil panel 12 is fitted on the outer periphery of the main body cylindrical portion of the lens barrel 11, and is mounted on the flange 115 as described above.
- the focus position (back focus) of the lens will also deviate from the light receiving surface power of the CCD2. Clear images cannot be obtained.
- the cylindrical cam 15 for guiding the lens is urged to the first lens holder 19 so that the focal position is adjusted to the light receiving surface of the CCD 2 by adjusting the lens position, and the force of the first lens holder is also reduced.
- the structure which can adjust a position is adopted. Specifically, the bottom of the cylindrical cam 15 is supported by the coil panel 12 and urged toward the first lens holder 19 located above. With such a structure, the lens position in the optical axis direction LD of the cylindrical cam 15 is stabilized.
- the structure in which the upper surface of the cylindrical cam 15 is in contact with the lower surface of the first lens holder 19 as described above to stabilize the lens position will be described in more detail.
- the upper surface of the cylindrical cam 15 is formed flat as shown in FIG.
- the lower surface of the first lens holder 19 with which the upper surface of the cylindrical cam 15 abuts is also formed flat. Since the cylindrical cam 15 rotates as will be described later, the lower surface of the first lens holder 19 with which the upper surface of the cylindrical cam 15 contacts is a sliding surface.
- the first lens holder 19 is fixed to the upper part of the lens barrel 11 when the present optical module is assembled. More specifically, a female screw portion (not shown) that is screwed to a male screw portion 117 formed on the outer periphery of the upper part of the lens barrel 11 is formed on the inner wall of the first lens holder 19.
- the lens barrel 11 is set on the substrate 1.
- the first lens holder 19 is fixed to the top of the lens barrel 11. Therefore, the position of the first lens holder 19 in the optical axis direction LD can be kept constant from the substrate 1.
- the position of the cylindrical cam 15 in the optical axis direction LD can be stabilized.
- lens holders 13 and 16 that hold lenses 14 and 17 are engaged with the cylindrical cam 15 and control the movement of these lenses. Therefore, by keeping the position of the cylindrical cam 15 stable, The positions of the plurality of lenses 14 and 17 in the optical axis direction are held at desired positions via the cylindrical cam 15.
- the height position of the cylindrical cam 15 can be simplified by rotating the first lens holder 19. Can be changed to Therefore, even if the back focus shifts due to an error in assembling the CCD 2 to the substrate, the back force can be easily corrected by rotating the first lens holder 19.
- the optical system unit 3 by rotating the first lens holder 19 on the upper part of the lens barrel 11, errors in parts and assembly can be easily eliminated.
- the present optical module performs accurate positioning with respect to the first lens holder 19 serving as a reference, with a simple idea of disposing the coil panel 12 under the cylindrical cam 15. As a result, it is possible to realize a lens moving mechanism in which the focus is surely focused on the CCD 2 disposed on the substrate without changing the cam curve as in the related art.
- the coil panel 12 since the coil panel 12 is formed in a conical shape, the coil panel 12 comes into wide contact with the bottom of the cylindrical cam 15 and urges it upward. Since the coil panel 12 has a conical shape, no coil exists immediately below the coil, and the coil panel 12 has an arrangement configuration, so that the contact height during compression can be reduced. That is, the coil panel 12 has a shape that can be arranged in a small space. Then, when a load is applied to the coil panel 12, the raised portion sinks down and deforms so as to flatten it, so that it can be further lowered during operation. Therefore, the coil panel 12 has a feature that it can withstand a relatively large load with a small volume.
- a power plate panel employing a conical coil panel 12 may be spirally wound V, and a so-called bamboo shoot panel may be similarly employed.
- the cylindrical cam 15 is disposed so as to surround the outer periphery of the lens barrel 11.
- a plurality of cam grooves (cam surfaces) 151 are formed on the inner wall of the cylindrical cam 15.
- An engagement pin is provided on the third lens holder 13 and the second lens holder 16 as a projection member that engages with the cam groove 151.
- the third lens holder 13 includes two engagement pins 131-1 and 131-2 that protrude in the radial direction.
- the second lens holder 16 includes the engagement pin 161-1 that protrudes in the radial direction. , 161-2.
- the shape of the cam groove 151 is defined so that these engagement pins are used as cam followers and move on a predetermined trajectory. Cam groove 151 of cylindrical cam 15 and engaging pin 13 The relationship between 1-1, 131-2 and the engaging pins 161-1, 161-2 will be described later in detail.
- a rack 159 indicated by reference numeral 159 is formed on the outer periphery of the cylindrical cam 15.
- the rack portion 159 is engaged with a driving gear not shown in FIG.
- the cylindrical force 15 rotates around the optical axis direction LD.
- the third lens holder 13 and the second lens holder 16 are moved along the optical axis direction LD.
- the third lens 14 is a correction lens disposed closest to the substrate 1, and is held by the third lens holder 13.
- the second lens 17 is a variable power lens disposed in the middle, and is held by the second lens holder 16.
- the first lens 18 is an objective lens located on the object side, and is held by a first lens holder 19.
- the third lens holder 13 and the second lens 17 are moved to desired positions on the LD in the optical axis direction by a cam groove 151 formed on the inner wall of the cylindrical cam 15 while being housed in the lens barrel 11.
- the distance between the third lens 14 and the substrate 1 and the distance between the lenses 14, 17, and 18 are changed, so that the image can be captured with the focal length changed from wide (WIDE) to tele (TELE). It is possible.
- FIG. 2 is an enlarged view of the third lens holder 13 and the second lens holder 16 shown in FIG.
- the two lens holders are set in the lens barrel 11 in a state where the vertical forces are close to each other and overlap as shown.
- the two engaging pins 131-1 and 131-2 projecting radially from the third lens holder 13 are provided with guide grooves (through holes) 11A and 11E formed in the lens barrel 11 so that the force protrudes outward and the cylindrical cam 15 Engage with cam groove 151.
- the two engaging pins 161-1 and 161-2 projecting radially from the second lens holder 16 project outward from the guide grooves 11C and 1IF (through holes) formed in the lens barrel 11 and have a cylindrical shape. Engage with the cam groove 151 of the cam 15.
- the third lens holder 13 and the second lens holder 16 will be described in order based on FIG. 2 with reference to FIG.
- Four guide rods 132-1-132-4 are formed at substantially equal intervals around the third lens holder 13. These guide rods 132-1 and 132-4 are formed to be in sliding contact with the guide grooves 11 A, 11 C, 11 E, and 11 G formed inside the lens barrel 11. From the two guide rods 132-1 and 132-3, the engagement pins 131-1 and 131-2 are radially oriented. It protrudes in the direction. Further, four receiving grooves 133-1-133 4 are formed in the peripheral portion of the third lens holder 13 so as to be located between the guide rods 132. These receiving grooves 133-1 to 133-4 are formed so as to receive the guide rods 162-1 to 164-2 of the second lens holder 16 having the same structure!
- the second lens holder 16 has a structure similar to that of the third lens holder 13. That is, four guide rods 162-1-162-4 are formed around the second lens holder 16. These guide rods 162-1—162-4 are formed so as to be in sliding contact with the remaining guide grooves 11B, 11D, 11F, and 11H formed inside the lens barrel 11. Pins 161-1 and 161-2 protrude radially from two of the guide rods 162-1 and 162-1.
- a receiving groove 163-1-1-163-4 is formed in the peripheral portion of the second lens holder 16. These receiving grooves 163-1-1-163-4 are formed so as to receive the guide rods 132-1-132-4 of the third lens holder 13.
- the third lens holder 13 and the second lens holder 16 form a mutually slidable state by engaging the guide rod and the receiving groove of each other. Then, the guide rods (132 and 162) of the lens holders 13 and 16 in this state are engaged with the guide grooves 11A-11H formed on the inner surface of the lens barrel 11, and are slidably housed. That is, in this optical module, the guide rods (132 and 162) of the lens holders 13 and 16 are the first guide member, and the guide grooves 11A-11H formed on the sliding surface of the lens barrel 11 are the second guide part.
- a guide structure for slidably holding the lens holders 13 and 16 within the lens barrel 11 is realized. Therefore, the second lens holder 16 and the third lens holder 13 can move relative to each other in the optical axis direction without interfering with each other.
- the engagement pins 161-1 and 161-2 projecting from the second lens holder 16 are arranged in the opposite direction on the straight line 16L.
- the third lens holder 13 disposed below the second lens holder 16 has the same structure.
- Engagement pins 131-1, 131-2 from the third lens holder 13 are also arranged in the opposite direction on the straight line 13L.
- the straight line 16L and the straight line 13L cross each other. It is set to be inserted.
- the second lens holder 16 and the third lens holder 13 form a four-point support state by engaging the guide rod and the receiving groove with each other. Therefore, the inclination of the optical axis of the lens held by both lens holders with respect to the optical axis direction LD on the substrate side can be suppressed more reliably.
- the lens holder is supported by the plurality of engagement pins as described above, a structure is provided in which stress can be dispersed and impact resistance when dropped is provided.
- the lens rods 13 and 16 have a guide rod and a receiving groove, they can be brought closer to each other. In addition, since one lens holder does not interfere with the guide rod extending, the guide rod can be set longer.
- the second lens holder 16 and the third lens holder 13 does not tilt with respect to the optical axis direction LD.
- the guide rods 132 and 162 it is possible to block light that enters the lens barrel from a guide groove (11A or the like) provided on the lens barrel 11 side. These also provide dustproof properties for preventing dust from entering the lens barrel 11.
- FIG. 3 is a diagram showing a cross-sectional configuration of the optical module in a state where the components shown in FIG. 1 are assembled.
- FIG. 3 illustrates a cover 40 that covers the outer peripheral portion of the optical system unit 3. The cover 40 will be described later.
- FIG. 3 the structure in which the above-described cylindrical cam 15 is urged upward can be more clearly confirmed. That is, a male screw part 117 formed on the upper part of the lens barrel 11 and a female screw part 197 formed on the inner wall of the first lens holder 19 corresponding thereto are shown.
- the uppermost first lens holder 19 is disposed above the lens barrel 11, and the cylindrical cam 15 is brought into contact with the first lens holder 19 by the urging force of the coil panel 12. Is determined. Therefore, the position of the third lens 14 can be set by the position of the first lens holder 19. Then, by rotating the first lens holder 19 with respect to the lens barrel 11, the knock focus position can be positioned so as to match the light receiving surface of the CCD 2.
- FIG. 3 shows an engagement pin 131 projecting radially from the third lens holder 13 and an engagement pin 161 projecting radially from the second lens holder 16.
- each of the lens holders 13 and 16 has two engagement pins, and FIG. 3 shows one of them.
- the engaging pins 131 and 161 engage with the cam grooves 151 formed on the inner wall of the cylindrical cam 15 disposed outside the lens barrel 11. Since the cylindrical cam 15 is urged upward by the coil panel 12 arranged at the lower part, the lens holders 13 and 16 move accordingly, and the position of the first lens holder 19 is used as a reference in the optical axis direction LD. Position is determined accurately.
- the second lens holder 16 and the third lens holder 13 correspond to a first lens holder
- the first lens holder 19 corresponds to a second lens holder.
- the cylindrical cam 15 employed in the optical system unit 3 exemplified in the present embodiment has a configuration in which a cam groove formed in the inner wall thereof is characteristic. Further, this point will be described.
- FIG. 3 shows a more detailed configuration of the cylindrical cam 15.
- the cylindrical cam 15 incorporated in the optical system unit 3 is formed by two cam parts, an upper cam 15U and a lower cam 15L.
- the cylindrical cam 15 also needs to be downsized.
- a cam groove 151 for accurately guiding the third lens holder 13 and the second lens holder 16 in the optical axis direction LD must be formed on the inner wall of the cylindrical cam 15. It is extremely difficult to accurately form a narrow groove on the inner wall of an extremely small tubular member. Therefore, the optical system unit 3 is manufactured by combining cam parts obtained by dividing the cylindrical cam 15.
- FIG. 4 is an enlarged view showing a state where the cylindrical cam 15 shown in FIG. 3 is divided into two components, an upper cam 15U and a lower cam 15L.
- the cylindrical cam 15 is vertically divided at a cam groove 151 formed in the inner wall.
- the engaging pin 131 of the third lens holder 13 and the engaging pin 161 of the second lens holder 16 engage with the cam groove 151.
- a cam groove 151 is formed based on a cam curve (profile) for guiding these engaging pins.
- a dividing line 152 between the upper cam 15U and the lower cam 15L is set so that the shape of the force curve appears at the end.
- the cam groove 151 is formed at a portion where the upper and lower cams 15U and 15L are connected.
- the upper cam 15U and the lower cam 15L are manufactured using two molds, respectively.
- the cylindrical cam 15 can be manufactured by combining them. Therefore, even if the cam groove 151 is a thin groove, the cylindrical cam 15 can be manufactured relatively easily. In this way, the cylindrical cam 15 can be made thin and small by plastic injection molding or the like using a mold. Further, since a process such as undercut is not required, a simple mold structure can be obtained.
- the heads of the engaging pins 131 and 161 have a substantially triangular cross section, and this portion serves as a cam follower and engages with the cam groove 151.
- the cam groove 151 has a V-shaped cross section corresponding to the shape of the engagement pin.
- the shape of the cam groove 151 is also shown in FIG. 4, and the cam groove 151 is formed to include the short vertical portion 153 at the center and the inclined portions 154 provided above and below the vertical portion.
- the engaging pins 131 and 161 are inclined cams having an inclined head force.
- a cam groove 151 is formed to guide the engagement pin as a cam follower!
- the inclined cam is used for the head of the engagement pin as described above, the diameter of the cylindrical cam 15 can be reduced while securing the wall thickness.
- a flat cam having a rectangular cross section may be employed at the head of the engaging pin. In this case, the position accuracy during the zoom operation can be increased.
- a recess 158 is formed from the upper surface of the upper cam 15U to the cam groove 151.
- the recess 158 is a guide groove for guiding the engagement pin 161 of the second lens holder 16 to the cam groove 151 in the cylindrical cam. Since the engaging pins 161 are arranged in the opposite direction on a straight line, two concave portions 158 are formed in the upper cam 15U. However, when the third lens holder 13 and the second lens holder 16 are set on the lower cam 15L and then assembled so as to cover the upper cam 15U, it is not necessary to form the recess 158. Absent. FIG.
- FIG. 4 shows that the cam groove corresponding to the second lens holder and the cam groove corresponding to the third lens holder are connected by a guide groove for guiding the lens holder.
- the third lens holder is guided from the recess 158 to the cam groove for guiding the second lens holder, and further passes through the connected guide groove to reach the cam groove for guiding the third lens holder.
- the second lens holder is guided from the recess 158 and set in the corresponding cam groove.
- the upper cam 15U has a downward projection 156
- the lower cam 15L has a receiving portion 157 for receiving the projection. These concavities and convexities are similarly formed at the opposite positions.
- the cylindrical cam 15 has upper and lower cams 15U with these uneven portions 156 and 157 as reference positions. 15L is connected and made. Therefore, the cylindrical cam 15 can be assembled with high accuracy, and the cam groove can be arranged on the inner surface with high positional accuracy.
- the upper cam 15U and the lower cam 15L have a structure that can be driven integrally by fitting, they can be formed integrally by an adhesive, laser welding, or the like.
- FIG. 5 is a developed view showing the shape of the cam groove 151 formed on the inner wall of the cylindrical cam 15 so that the shape can be confirmed. According to FIG. 5, the state of the cam groove 151 formed on the inner wall of the cylindrical cam 15 can be more clearly confirmed.
- the cam groove 151 includes a cam groove 151-1 and a cam groove 151-2 defined by different cam curves.
- the cam groove 151-1 regulates the operation of the zoom lens system corresponding to the second lens holder 16.
- the cam groove 151-2 defines the lens operation of the correction system corresponding to the third lens holder 13. That is, the engaging pins 161-1 and 161-2 of the second lens holder 16 engage with the cam grooves 151-1.
- the engagement pins 131-1 and 131-2 of the third lens holder 13 are engaged with the cam grooves 151-2.
- the dividing line 152 between the upper cam 15U and the lower cam 15L is set to be divided along the cam grooves 151-1 and 151-2. Also, according to FIG. 5, the relationship between the vertical portion 153 and the inclined portion 154 of the cam groove 151 can be confirmed.
- the dividing line 152 includes a parallel dividing line portion 152LD that is parallel to the optical axis direction LD. By forming the division line 152 in this way, it is possible to suppress unnecessary space in the circumferential direction of the cylindrical cam 15. However, if there is some margin in the circumferential direction, the dividing line portion 152LD may be inclined.
- FIG. 6 is a view schematically showing a modified example of the cylindrical cam 15 formed by a plurality of cam parts.
- the cylindrical cam 15 shown in FIGS. 4 and 5 is composed of two upper and lower cams 15U and 15L.
- FIG. 6 shows an example in which three components are used.
- the cylindrical cam 15 also has three cam component forces of an upper cam 15U, an intermediate cam 15M, and a lower cam 15L.
- the upper cam 15U and the intermediate cam 15M are separated by a division line 152-1 and the lower cam 15L and the intermediate cam 15M are separated by a division line 152-2.
- the division lines 152-1 and 152-2 are set based on different cam curves. These dividing lines also include a parallel dividing line portion 152LD that is parallel to the optical axis direction LD, thereby suppressing unnecessary space in the circumferential direction. Curved part 1 at dividing line 152-1 52—ICA is the original cam curve. Similarly, in the division line 152-2, the inclined straight portion 152-2CA is the original cam curve.
- the intermediate cam 15M is formed thinner than the upper and lower cams 15U and 15L, and when these are set, cam surfaces are formed at the upper end and the lower end of the intermediate cam 15M.
- the engagement pin from the lens holder of the correction system is set so as to contact the curved portion 152-1CA. Similarly, the engagement pin from the lens holder of the variable power system is set to abut on the curved portion 152-2CA.
- the upper cam surface and the lower cam surface may also be V-shaped in cross section, and the projection of the lens holder may be guided to arrange the lens holder on the cam surface.
- a concave portion (groove portion) for guiding the lens holder is provided at the optical axis end of the cam 15 via a cam surface on which the other lens holder is disposed or a concave portion for guiding the other lens holder. It is also possible to guide the lens holder.
- FIG. 6 shows an example in which a cylindrical cam is constituted by three cam parts, it may be constituted by more divided parts.
- the degree of freedom of the lens holder is limited, so that the angle of the lens holder with respect to the optical axis direction is stabilized. Have. For this reason, the number of guide grooves can be reduced.
- FIG. 7 is a diagram showing a cam curve (profile) preferable for defining a cam groove formed on the inner wall of the cylindrical cam 15.
- FIG. 7 (A) shows a cam curve 151-1CA that defines a cam groove 151-1 for a variable power lens!
- (B) shows a cam curve 151-2CA defining a cam groove 151-2 for the correction system lens. That is, the second lens holder 16 is moved in the optical axis direction based on the cam curve 151-1CA. The third lens holder 13 is moved in the optical axis direction based on the other cam curve 151-2CA.
- the engagement pins 161 — 1 and 161 — 2 force protruding in the radial direction of the second lens holder 16 are formed in the optical axis direction by the cam groove 151 — 1 defined by the cam curve 151 — 1 CA. It is moved in the direction.
- the engagement pins 131-1, 131-2 projecting in the radial direction of the third lens holder 13 are moved in the optical axis direction by the cam groove 151-2 defined by the cam curve 151-2CA.
- FIG. 7 illustrates a cam curve when a macro function is added to the telephoto side in addition to the zoom function.
- the present optical module is miniaturized so that it can be mounted on a mobile phone or the like.
- a zoom function is provided as described above, it is important to accurately move each lens holder to a desired position.
- a method of arranging a position detecting member for confirming that the lens holder is at a wide-angle position or a telephoto position is conventionally generally employed.
- the position detecting member is separately provided as described above, the size of the optical module becomes large, which contradicts the demand for miniaturization.
- the optical module used for a mobile phone or the like has a circumference that is short with respect to the circumferential angle of the extremely small cylindrical cam.
- the cam curves shown in FIG. 7 can achieve desired characteristics without position detection at the wide-angle end and the telephoto end by providing flat portions in the cam curves of the variable power system and the correction system.
- a rack 159 is fixed to the outer periphery of the cylindrical cam 15, and the driving force of the actuator is transmitted by a gear that matches the rack 159. Even if a gear with high dimensional accuracy is adopted, it is difficult to eliminate the effect of backlash. There is also the effect of other components and assembly errors. In the present optical unit 3, the position of the rotating cam cannot be detected with high accuracy because there is no position detecting member. When the cylindrical cam 15 is rotated between the wide-angle end and the telephoto end in the zoom operation, despite the fact that the cylindrical cam 15 is rotated by a predetermined angle with the actuator, the desired wide-angle end or There is a possibility that the cylindrical cam will rotate to the position at the telephoto end.
- both ends of the curved portion (zoom portion) for zooming the lens that is, the wide-angle end (wide end) and the telephoto end (tele end)
- a cam curve with a flat part of a predetermined length orthogonal to the LD is adopted. That is, in the present embodiment, a cam curve having such a flat portion is adopted as a cam curve of the variable power system and the correction system of the cylindrical cam 15.
- the actuator is driven in consideration of the distance of the flat part, so that even if the imaging distance is shifted, it moves to the flat part at the telephoto end By doing so, the performance at the telephoto end can be maintained. Therefore, it is possible to eliminate the influence of the butt lash and the assembly error, and to stably achieve the predetermined performance at the wide-angle and telephoto positions.
- a 550-pulse drive pulse should be added to the position on the flat part of 25 pulses from the telephoto end to move to the telephoto end. If it moves within 25 pulses before and after the target value, it means that the cylindrical cam has been driven to rotate at the telephoto end, and the desired movement has been achieved.
- the cam curve illustrated in FIG. 7 has a macro shooting curve and a flat portion added to the telephoto side. In this case, too, the force enters the macro state via the flat part at the telephoto end, so focusing is performed with high accuracy. Further, since a predetermined function can be achieved in the flat portion, stable operation is possible.
- the macro function can be stably achieved on the macro side by absorbing the positional deviation of the cylindrical cam. Can be used.
- the macro function is It is not essential, so it doesn't include the curve part for the macro.
- the present optical module also has excellent features regarding the assembly structure.
- the cylindrical cam 15 is driven by the actuator, and the third lens holder 13 and the second lens holder 16 move in the optical axis direction.
- the lens barrel 11 is precisely positioned with respect to the CCD 2 on the substrate, and the cylindrical cam 15 is arranged around the outer periphery of the lens barrel 11.
- the actuator is so arranged that the driving force is efficiently transmitted to the cylindrical cam 15. Need to be placed.
- the optical system unit 3 and the actuator shown in FIG. 1 are individually configured, and these are combined on a substrate to form one module.
- a form is conceivable.
- a method of providing positioning holes or pins on the substrate 1 side or positioning guide pins for positioning the actuator is adopted.
- the position of the lens barrel 11 fixed first to the substrate 1 is a reference.
- the lens barrel 11 is positioned with respect to the optical axis (optical center) of the CCD 2.
- the lens barrel 11 is arranged so as to focus on the CCD 2 on the substrate.
- a mounting error of the CCD 2 or the lens barrel 11 occurs with respect to the design position. If the error exceeds the allowable range, the position of the lens barrel 11 is adjusted to match the optical center of the CCD 2 or the lens barrel 11 is positioned based on the outer shape of the CCD 2 and the error is corrected. Needs to be resolved.
- the lens barrel 11 is arranged at a predetermined position on the substrate 1.
- the arrangement of the actuator on the substrate is determined.
- the position of the lens barrel 11 shifts during actual assembly.
- the position of the cylindrical cam 15 set on the outer periphery also shifts. If the position of the cylindrical cam is displaced, the relative position with respect to the actuator will be out of the designed range, and the predetermined performance as the optical module cannot be maintained.
- the optical system fuse is provided via a cover that covers the optical system unit 3.
- a configuration for positioning the unit 3 and the actuator is adopted. With such a configuration, even if the position of the lens barrel 11 is shifted, the position of the actuator moves while maintaining the relative positional relationship with the lens barrel 11. It is an easy configuration to achieve performance.
- the cover for the optical system unit 3 and the cover for the actuator can be integrated, so that space can be saved.
- FIG. 8 is a diagram showing a drive unit for driving the optical system unit 3 and a cover set on the optical system unit 3.
- FIG. 8 shows the first lens 18 and the first lens holder 19 located at the top so that the relationship with the optical system unit 3 can be confirmed.
- FIG. 9 is a diagram showing an optical module in a completed state in which the optical system unit 3 and the motor 30 as an actuator are assembled so that the sectional configuration can be confirmed.
- FIG. 8 shows the components of the motor 30 in an exploded state.
- the motor 30 is assembled using a cover 40 and a substrate 31, and the cover 40 is set on the substrate 1 of the optical system unit 3.
- the motor 30 includes a pair of coils 32 and a stator 33, and has a rotor 35 at the center.
- a shaft 41 fixed to a predetermined position of the cover 40 and a shaft for the rotor 35 are coaxially arranged, and the rotor 35 is set to rotate about the shaft 41.
- the shaft 41 is set in a hole 51 formed in the cover 40.
- a gear 36 that rotates integrally with the rotor 35 is provided.
- a shaft 42 is fixed to another position of the cover 40.
- the shaft 42 is provided with a gear 43 that engages with the gear 36 and a gear 44 that rotates integrally with the gear 43.
- a rack 159 formed on the outer periphery of the cylindrical cam 15 is engaged with the gear 44.
- the shaft 42 is set in a hole 52 formed in the cover 40.
- FIG. 9 shows a state in which the components shown in FIG. 8 are assembled.
- the first lens holder 19 is fitted in an opening 45 formed in the cover 40. Therefore, the lens barrel 11 and the cylindrical cam 15 are positioned with respect to the cover 40 via the first lens holder 19. Further, the shafts 41 and 42 are positioned at predetermined positions of the cover 40.
- the motor 30 is positioned with respect to the axis 41. In this structure, the cover 40 Thus, the positional relationship between the lens barrel 11 and the cylindrical cam 15 side and the motor 30 side is determined. Therefore, even if the set position of the lens barrel 11 is shifted, the position of the motor 30 via the cover 40 also moves in accordance with the position of the optical system unit 3. That is, the relative positional relationship between the cylindrical cam 15 and the motor 30 is maintained, and no displacement occurs.
- this optical module can transmit the driving force of the motor efficiently as designed.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Lens Barrels (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003361442A JP2005128114A (ja) | 2003-10-22 | 2003-10-22 | 光学モジュール |
JP2003-361442 | 2003-10-22 |
Publications (1)
Publication Number | Publication Date |
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WO2005040888A1 true WO2005040888A1 (ja) | 2005-05-06 |
Family
ID=34509937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/015016 WO2005040888A1 (ja) | 2003-10-22 | 2004-10-12 | 光学モジュール |
Country Status (3)
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JP (1) | JP2005128114A (ja) |
KR (1) | KR100781902B1 (ja) |
WO (1) | WO2005040888A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2799921A1 (en) * | 2013-04-30 | 2014-11-05 | Ingrasys Technology Inc. | Adjustment apparatus for camera module |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9251712B2 (en) | 2007-03-18 | 2016-02-02 | Persinvitro Llc | Method and apparatus to encourage development of long term recollections of given episodes |
CN104133281A (zh) * | 2013-05-03 | 2014-11-05 | 鸿富锦精密工业(深圳)有限公司 | 镜头模组的调节装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61190515U (ja) * | 1985-05-20 | 1986-11-27 | ||
JPH0392615U (ja) * | 1990-01-12 | 1991-09-20 | ||
JP2003279827A (ja) * | 2002-03-22 | 2003-10-02 | Ricoh Co Ltd | ズーム鏡胴 |
-
2003
- 2003-10-22 JP JP2003361442A patent/JP2005128114A/ja active Pending
-
2004
- 2004-10-12 WO PCT/JP2004/015016 patent/WO2005040888A1/ja active Application Filing
- 2004-10-12 KR KR1020067006432A patent/KR100781902B1/ko not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61190515U (ja) * | 1985-05-20 | 1986-11-27 | ||
JPH0392615U (ja) * | 1990-01-12 | 1991-09-20 | ||
JP2003279827A (ja) * | 2002-03-22 | 2003-10-02 | Ricoh Co Ltd | ズーム鏡胴 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2799921A1 (en) * | 2013-04-30 | 2014-11-05 | Ingrasys Technology Inc. | Adjustment apparatus for camera module |
US8928801B2 (en) | 2013-04-30 | 2015-01-06 | Ingrasys Technology Inc. | Adjustment apparatus for camera module |
Also Published As
Publication number | Publication date |
---|---|
KR20060058143A (ko) | 2006-05-29 |
JP2005128114A (ja) | 2005-05-19 |
KR100781902B1 (ko) | 2007-12-04 |
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