JP2013076920A - Optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately adjust inclination (turning) with respect to an optical axis, a position in the optical axis direction and the like while achieving simplification of a structure, cost reduction, facilitation of assembling work and the like.SOLUTION: An optical device includes: a plurality of optical units 50 to 80; a unit base 10; a sensor unit 100 which holds an imaging element 102 and is connected to a rear end wall 12 of the unit base; and a first guide shaft 31 and a second guide shaft 32. The unit base 10 has fitting holes 14a and 14b for fixation for fitting and fixing the first guide shaft and the second guide shaft so that the guide shafts protrude from the end wall, and each of the optical units and the sensor unit has a first fitting hole for slidably fitting the first guide shaft, and a second fitting hole for slidably fitting the second guide shaft so as to regulate the rotation around the first guide shaft. Accordingly, inclination with respect to an optical axis, a position in the optical axis direction and the like are accurately and easily adjusted.

Description

  The present invention relates to an optical device in which a plurality of optical elements, an image sensor, and the like are assembled on a unit base, and more particularly to an optical device including a prism that bends an optical axis as an optical element.

As a conventional optical device, an upper lens barrel (unit base), a lower lens barrel (unit base) connected to the upper lens barrel, a CCD accommodating portion that accommodates an image sensor (CCD) and is connected to the lower lens barrel, A plurality of optical elements (a first lens group including a first lens, a prism, and a second lens, a second lens group, a third lens group, a fourth lens group, a shutter unit, etc.) and the like are provided. Three lens groups are provided in the upper lens barrel, the fourth lens group and the CCD housing are provided in the lower lens barrel, and the upper lens barrel and the lower lens barrel are connected so that the shutter unit is sandwiched between the upper lens barrel and the lower lens barrel. In addition, a lens unit (lens unit) in which a mask sheet is interposed between a prism and a second lens in order to adjust the position in the optical axis direction is known (see, for example, Patent Document 1).
However, in this optical device (lens unit), in order to make the optical axes of a plurality of optical elements coincide with each other, the dimensional accuracy of the upper barrel and the lower barrel is increased and the connection region between the upper barrel and the lower barrel is increased. It is necessary to increase the accuracy, and therefore it is not easy to assemble so that the optical axes of the respective optical elements coincide. In addition, even if alignment in the optical axis direction can be performed by interposing a mask sheet between the prism and the second lens, it is not possible to adjust the inclination with respect to the optical axis.

Other optical devices include a unit base (base member, lens barrel) on which lens optical elements are arranged, a CCD plate (CCD base) for fixing the image sensor, an optical low-pass filter fixed to the unit base, and an image sensor. And a plurality of compression springs arranged in a compressed state between the rear end wall of the unit base and the CCD plate, and the like. Through which the three adjustment screws are screwed into the screw holes provided in the rear end wall of the unit base and the amount of screwing is adjusted appropriately to adjust the inclination of the image pickup device (image pickup surface) with respect to the optical axis. (Imaging device) is known (see, for example, Patent Document 2 and Patent Document 3).
However, in this optical device (imaging device), even though the inclination of the imaging element with respect to the optical axis can be adjusted, it is not easy to make the optical axis coincide with other optical elements. Therefore, it is necessary to increase the dimensional accuracy of the assembly or to assemble it with high precision using an adjusting device, and the assembly work is not easy.

Furthermore, as other optical devices, a case-shaped unit base (guide base) that is elongated in the optical axis direction and has a rectangular cross section, a plurality of insertion holes provided in both end walls of the unit base in the optical axis direction, an optical axis Three guide shafts (first guide shaft, second guide shaft, and third guide shaft) inserted with a gap in the insertion hole of the unit base so as to extend in the direction, a guide shaft (first guide shaft and A first lens holder supported movably in the optical axis direction by a third guide shaft), and a first lens holder supported movably in the optical axis direction by a guide shaft (second guide shaft and third guide shaft). 2 lens holders, a prism holder (prism unit) that holds the prism and is connected to the front end wall of the unit base, and a sensor unit (imaging device) that is connected to the rear end wall of the unit base. The two lens holders are arranged at predetermined positions on the base, and the three guide shafts from one side are passed through the fitting holes of the respective lens holders and through the insertion holes of the unit base. Member, the second guide shaft holding member), and hold the three guide shafts (the outer peripheral surface thereof) and the insertion holes (the inner peripheral surface thereof) of the unit base so that a gap is formed. Adhesive is injected between the shaft and the insertion hole to fix the guide shaft to the unit base, and then the three guide shafts protruding from the front end wall of the unit base are fitted into the fitting holes of the prism holder. There is disclosed a lens unit (lens unit) in which a prism holder is connected and a sensor unit is connected to a rear end wall of a unit base (see, for example, Patent Document 4).
However, in this optical device (lens unit), the insertion holes of the unit base for passing the three guide shafts are formed larger than the outer diameters of the three guide shafts so as to define the gaps, and are inserted into the insertion holes. Since a dedicated assembling apparatus and an adhesive are used to fix the guide shaft to the unit base, the assembling work is complicated, and each lens holder (lens), prism holder (prism), It is not easy to align the optical axis of the sensor unit (imaging device) or adjust the inclination with respect to the optical axis.

JP 2006-91344 A JP-A-2005-70386 JP 2003-134383 A JP 2010-66292 A

  The present invention has been made in view of the above circumstances, and its object is to simplify the structure, reduce the cost, and facilitate the assembly work without increasing the manufacturing accuracy of each part. It is an object of the present invention to provide an optical device capable of adjusting the inclination (bending) with respect to the optical axis and adjusting the position in the optical axis direction with high accuracy.

The optical device of the present invention includes a plurality of optical units including a movable unit arranged in the optical axis direction and movable in the optical axis direction or a fixed unit stationary in the optical axis direction to form an optical image, and a movable unit or a fixed unit. A unit base that houses the unit, a sensor unit that holds the image sensor and is connected to the rear end wall of the unit base, and a first guide shaft and a first guide shaft that are disposed on the unit base so as to extend in the optical axis direction An optical device including two guide shafts, wherein the unit base has a fixing fitting hole for fitting and fixing the first guide shaft and the second guide shaft so as to protrude from the end walls thereof, Each of the movable unit or the fixed unit and the sensor unit includes a first fitting hole for slidably fitting the first guide shaft and a portion around the first guide shaft. Having a second fitting hole in which the second guide shaft so as to restrict the rotation slidably fitted, is characterized by.
According to this configuration, the first guide shaft and the second guide shaft are fitted in the fixing fitting holes of the unit base in a state where the plurality of optical units are arranged in the unit base, and the respective optical units. The movable unit is slidably fitted in the first fitting hole and the second fitting hole (that is, in a state where the first guide shaft and the second guide shaft are fixed to the unit base by fitting). Is guided by two guide shafts so as to slide in the optical axis direction, and the fixed unit is slidably fitted to the two guide shafts and fixed at a predetermined position of the unit base), and the sensor unit The first guide shaft and the second guide shaft protruding from the rear end wall of the unit base are slidably fitted into the first fitting hole and the second fitting hole. More for the optical axis alignment is performed, based on the first guide shaft and the second guide shaft can be assembled so as to match the optical axes of all optical elements (optical unit 及 sensor unit).
That is, the plurality of optical units (movable unit or fixed unit) and the sensor unit manage the dimensional accuracy between the first fitting hole and the second fitting hole and the optical axis, respectively (that is, the assembled product). The manufacturing cost can be obtained simply by assembling to the first guide shaft and the second guide shaft which are manufactured by being controlled as limited to the dimensions related to the portions engaged with the two guide shafts as the tolerance range, and fitted and fixed to the unit base. While achieving this reduction, the optical axis can be aligned with high accuracy by a simple assembling operation.

In the above configuration, the plurality of optical units include a prism unit that holds a prism that bends the optical axis and is connected to the front end wall of the unit base, and the prism unit slidably fits the first guide shaft. A first fitting hole and a second fitting hole for slidably fitting the second guide shaft so as to restrict rotation around the first guide shaft; the first fitting hole and the second fitting hole; It is possible to adopt a configuration in which the first guide shaft and the second guide shaft protruding from the front end wall of the unit base are respectively fitted and then fastened to the unit base using a plurality of screws.
According to this configuration, the prism unit can adjust the optical axis by fitting the first guide shaft and the second guide shaft protruding from the front end wall of the unit base into the first fitting hole and the second fitting hole. Therefore, the optical axis with other optical elements (optical unit and sensor unit) can be easily assembled with reference to the first guide shaft and the second guide shaft.
That is, the plurality of optical units (prism unit, movable unit or fixed unit) and the sensor unit manage the dimensional accuracy between the first fitting hole and the second fitting hole and the optical axis, respectively (that is, assembled). As the tolerance range of the finished product, it is manufactured only by controlling the dimensions related to the parts that engage with the two guide shafts, and assembled to the first guide shaft and the second guide shaft that are fitted and fixed to the unit base. The optical axis can be aligned with high accuracy by a simple assembling operation while achieving a reduction in manufacturing cost.

In the above configuration, the spacer sheet is formed between the prism unit and the front end wall of the unit base so that the spacer sheet can be sandwiched in regions corresponding to a plurality of screws in order to adjust the inclination of the prism unit with respect to the optical axis. The configuration can be adopted.
According to this configuration, when the prism unit is fastened to the unit base with a screw, the inclination of the prism unit with respect to the optical axis can be adjusted by appropriately sandwiching the spacer sheet in a region corresponding to the screw. That is, when the prism unit is assembled to the unit base, the optical axis alignment is performed by the first guide shaft and the second guide shaft, and the inclination adjustment with respect to the optical axis can be performed by appropriately sandwiching the spacer sheet. While achieving reduction, the optical axis alignment and tilt adjustment can be performed with high accuracy by a simple assembling operation.

In the above configuration, the sensor unit has a plurality of through-holes through which a plurality of screws pass, and the unit base is formed and bonded around a plurality of screw holes for screwing the plurality of screws and around the plurality of screw holes, respectively. The sensor unit has a plurality of reservoir portions for storing the agent, and the sensor unit is configured to fit the first guide shaft and the second guide shaft protruding from the rear end wall of the unit base into the first fitting hole and the second fitting hole, respectively. After that, it is possible to adopt a configuration in which a compression spring is interposed between the unit base and fastened by using a plurality of screws and fixed by an adhesive injected into the reservoir.
According to this configuration, when the sensor unit is assembled to the unit base, the first guide shaft and the second guide shaft that protrude from the rear end wall of the unit base into the first fitting hole and the second fitting hole of the sensor unit. Each sensor unit (imaging element) is fitted by fitting a compression spring between the unit base and passing a plurality of screws through the through holes and screwing them into the screw holes of the unit base. The inclination of the image pickup surface) with respect to the optical axis can be adjusted, and then, by injecting an adhesive into the reservoir, the screws can be firmly fixed so as not to loosen.

In the above configuration, the unit base has three positioning recesses formed to position the fixed unit at a predetermined position in the optical axis direction, and the fixed unit has three positioning protrusions fitted into the three positioning recesses of the unit base. A configuration having the following can be adopted.
According to this configuration, the inclination of the fixed unit with respect to the optical axis can be easily adjusted by fitting the three positioning protrusions of the fixed unit into the three positioning recesses of the unit base.

In the above configuration, the movable unit or the fixed unit includes a lens and a lens holding frame that fits and holds the outer edge of the lens so as to cover the opening while defining the opening, and the lens holding frame includes the outer edge of the lens. Three receiving surfaces that receive the portion in the optical axis direction, an adhesive groove that is formed lower than the receiving surface and can be filled with adhesive, and lower than the receiving surface and higher than the adhesive groove It is possible to adopt a configuration having a prevention wall that is formed and prevents the adhesive from flowing into the opening.
According to this configuration, when the lens is fitted and fixed to the lens holding frame, the outer edge portion of the lens is brought into contact with the three receiving surfaces in the optical axis direction, and the adhesive is injected into the adhesive groove to be fixed. . Here, because the prevention wall is provided, it is possible to prevent the adhesive injected into the adhesive groove from climbing over the receiving surface and flowing into the opening, thus preventing the lens from lifting (tilting) due to the adhesive. The lens can be fixed at a predetermined position with high accuracy.

  According to the optical device having the above configuration, the tilt with respect to the optical axis can be achieved without increasing the manufacturing accuracy of each component (optical element), while simplifying the structure, reducing the cost, and facilitating the assembly work. It is possible to obtain an optical device capable of adjusting (sharpness), adjusting the position in the optical axis direction, and the like with high accuracy.

1 is an external perspective view of an optical device according to the present invention. It is an end view of an optical device, (a) is the front end figure, (b) is the rear end figure. It is a disassembled perspective view of an optical apparatus. It is a disassembled perspective view of an optical apparatus. It is a top view which shows the inside of an optical apparatus (in the state which removed the cover). It is a sectional side view which shows the inside of an optical apparatus. It is a disassembled perspective view which shows the unit base and prism unit which make a part of optical apparatus. It is a disassembled perspective view which shows the unit base and sensor unit which make a part of optical apparatus. It is a top view which shows the unit base (and 1st guide shaft and 2nd guide shaft) which makes a part of optical device. It is sectional drawing in the direction perpendicular | vertical to the optical axis of the unit base which makes a part of optical device. It is sectional drawing in the direction perpendicular | vertical to the optical axis of the unit base which makes a part of optical device. 1 shows a shutter unit (fixed unit, optical unit) that forms part of an optical device, where (a) is a plan view and (b) is a front view. It is a front view which shows the shutter unit (fixed unit, optical unit) which makes a part of optical device. It is a front view which shows the state which removed the lens from the shutter unit shown in FIG. It is a fragmentary sectional view of the shutter unit shown in FIG. 1 shows an image shake correction unit (fixed unit, optical unit) that forms part of an optical device, where (a) is a plan view and (b) is a front view. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the optical device includes a box-shaped unit base 10 that defines an internal space, a cover 20 that covers an opening 11 of the unit base 10, and a unit base 10. The fixed first lens shaft 31 and the second guide shaft 32 that are fixed, the fixed lens group 40, the movable lens group 50 as the movable unit, the shutter unit 60 as the fixed unit, and the movable unit as the movable unit. A lens group 70, an image blur correction unit 80 as a fixed unit, an optical filter 90, a sensor unit 100 connected to the rear end wall 12 of the unit base 10, a prism unit 110 connected to the front end wall 13 of the unit base 10, etc. It has.

  As shown in FIGS. 5 to 9, the unit base 10 is formed in a shape that is thin and flat in the optical axis L1 direction and has a substantially rectangular shape that is long in the optical axis L2 direction perpendicular to the optical axis L1. Two fixings for fitting and fixing the opening 11 that opens the internal space, the rear end wall 12 that connects the sensor unit 100, the front end wall 13 that connects the prism unit 110, and the first guide shaft 31. The fitting hole 14a, the two fitting fitting holes 14b for fitting and fixing the second guide shaft 32, the fixing portion 15 for fixing the fixed lens group 40, and the three for positioning the shutter unit 60 in the optical axis L2 direction. The positioning recess 16, the three positioning recesses 17 for positioning the image blur correction unit 80 in the direction of the optical axis L2, the fixed portion 18 for fixing the optical filter 90, and the movable lens groups 50 and 70 are provided. And a fixing portion 19 for fixing the motor 52, 72 for moving.

As shown in FIGS. 3 to 8, the opening 11 allows the movable lens group 50, the shutter unit 60, the movable lens group 70, and the image touch correction unit 80 to enter the unit base 10 from the direction perpendicular to the optical axis L2. It is formed so that it can be arranged.
As shown in FIG. 8, the rear end wall 12 is fixed in the vicinity of two fixing fitting holes 14a and 14b for fitting and fixing one end sides of the first guide shaft 31 and the second guide shaft 32. Around the portion 18, there are provided three screw holes 12 a into which screws B for connecting the sensor unit 100 are screwed, and three reservoir portions 12 b formed around the screw holes 12 a for accumulating the adhesive. As shown in FIG. 8, the reservoir portion 12 b protrudes from the rear end wall 12 to the rear in the optical axis direction L <b> 2 in a substantially cylindrical shape, and a part of the cylindrical wall is cut out to fasten the sensor unit 100. It is formed so that an adhesive can be easily injected.

  As shown in FIG. 7, the front end wall 13 is fixed in the vicinity of two fixing fitting holes 14a and 14b for fitting and fixing the other end sides of the first guide shaft 31 and the second guide shaft 32. Around the portion 15, there are provided three screw holes 13a into which screws B for connecting the prism unit 110 are screwed, and three flat surfaces 13b formed around the screw holes 13a and receiving the spacer sheet 120, respectively.

As shown in FIG. 9, two fixing fitting holes 14 a and 14 b are provided in each of the rear end wall 12 and the front end wall 13.
The fixing fitting holes 14a and 14a project the first guide shaft 31 from the rear end wall 12 by a predetermined amount rearward in the optical axis L2 direction and from the front end wall 13 by a predetermined amount forward in the optical axis L2 direction. And is held so as to be parallel to the direction of the optical axis L2 assumed at the approximate center of the unit base 10.
The fitting holes 14b and 14b for fixing project the second guide shaft 32 from the rear end wall 12 by a predetermined amount rearward in the optical axis L2 direction and from the front end wall 13 by a predetermined amount forward in the optical axis L2 direction. And is held so as to be parallel to the direction of the optical axis L2 assumed at the approximate center of the unit base 10.
As shown in FIGS. 7 and 8, the fixed portion 15 is formed as an opening that is rectangular and has opposite edges curved and demarcating stepped portions around it. ) To be aligned with the optical axis L2, the fixed lens group 40 is held and fixed.

As shown in FIGS. 9 and 10, the three positioning recesses 16 are formed in the same plane perpendicular to the optical axis L2, that is, at the same position in the optical axis L2 direction. Then, by fitting the shutter unit 60 (three positioning projections 61h) into the three positioning recesses 16, the inclination of the shutter unit 60 with respect to the optical axis L2 (the optical axis on the shutter unit 60 is the direction of the optical axis L2). It can be easily adjusted to match.
The positioning recess 16 is formed with a protrusion 16a that protrudes rearward in the direction of the optical axis L2, and the shutter unit 60 is positioned (tilt adjustment) using elastic deformation of the protrusion 16a. Can be performed with high accuracy.

As shown in FIGS. 9 and 11, the three positioning recesses 17 are formed in the same plane perpendicular to the optical axis L2, that is, at the same position in the optical axis L2 direction. Then, by fitting the image blur correction unit 80 (three positioning projections 81d thereof) into the three positioning recesses 17, the inclination of the image blur correction unit 80 with respect to the optical axis L2 (the optical axis on the image blur correction unit 80 is It can be easily adjusted (to coincide with the direction of the optical axis L2).
The positioning recess 17 is formed with a protrusion 17a that protrudes rearward in the direction of the optical axis L2, and the image blur correction unit 80 is positioned (inclined) by using elastic deformation of the protrusion 17a. Adjustment) can be performed with high accuracy.

As shown in FIGS. 7 and 8, the fixing portion 18 is formed as an opening that defines a substantially stepped portion having a substantially rectangular shape and a stepped portion around it, and makes the optical filter 90 (the optical axis thereof) coincide with the optical axis L2. Therefore, the optical filter 90 is formed to be held and fixed.
As shown in FIGS. 6 and 7, the fixing unit 19 is internally provided to fix the motor 52 that drives the movable lens group 50 and the motor 72 that drives the movable lens group 70 along the outer wall surface of the unit base 10. It is formed so as to define a convexly curved wall surface.

  In the unit base 10 having the above configuration, from the optical axis L2 of the fixing fitting holes 14a and 14b with respect to the optical axis L2 (virtual optical axis L2 that passes through substantially the center when no optical element is incorporated). , The parallelism with respect to the optical axis L2, the alignment between the centers of the fixed portions 15 and 18 and the optical axis L2, the perpendicularity with respect to the optical axis L2, the separation distance of the positioning recesses 16 and 18 from the optical axis L2 and the optical axis The unit base 10 is molded by a mold because the optical axis L2 alignment and the inclination adjustment with respect to the optical axis L2 can be performed with high accuracy by only managing dimensions for defining the verticality with respect to L2. The manufacturing cost of the mold at the time can be reduced.

  As shown in FIGS. 1, 3, 4, and 6, the cover 20 includes a plurality of optical units (movable lens group 50, shutter unit 60, movable lens group 70, image touch correction unit 80, etc.) in the unit base 10. ) In order to close the opening 11, the unit base 10 is assembled by snap-fit coupling or the like.

As shown in FIGS. 5 to 9, the first guide shaft 31 is formed to have a circular cross section and extend in the direction of the optical axis L2, and includes a fixing fitting hole 14a in the rear end wall 12 of the unit base 10 and The front end wall 13 is fitted and fixed in the fixing fitting hole 14a, defines a guide direction parallel to the optical axis L2, and aligns the optical axis of each optical unit with the optical axis L2 in a direction perpendicular to the optical axis L2. It is formed to perform optical axis alignment.
That is, the first guide shaft 31 is configured such that each optical unit (the movable lens group 50, the shutter unit 60, the movable lens group 70, the image shake correction unit 80) is disposed in the unit base 10, for example, the rear end wall 12 through the first fitting holes 51b, 61f, 71b and 81b of each optical unit, and further through the fixing fitting hole 14a in the front end wall 13 and through the rear end. One end of the wall 12 is projected rearward in the direction of the optical axis L2 by a predetermined amount, and the other end is projected forward from the front end wall 13 in the direction of the optical axis L2 by a predetermined amount. It is fixed in a state parallel to the assumed direction of the optical axis L2.

As shown in FIGS. 5 to 9, the second guide shaft 32 is formed to have a circular cross section and extend in the direction of the optical axis L2, and the fixing fitting hole 14b of the rear end wall 12 of the unit base 10 and The front end wall 13 is fitted and fixed in the fixing fitting hole 14b to define a guide direction parallel to the optical axis L2, and each optical unit (movable lens group 50, shutter unit 60, movable lens group 70, image shake). The correction unit 80) is configured to restrict rotation around the first guide shaft 31.
In other words, the second guide shaft 32 is configured so that each optical unit (the movable lens group 50, the shutter unit 60, the movable lens group 70, the image shake correction unit 80) is disposed in the unit base 10, for example, the rear end wall. 12 through the fixing fitting hole 14b of each optical unit, through the second fitting holes 51c, 61g, 71c, 81c of each optical unit, and further through the fixing fitting hole 14b of the front end wall 13, One end of the unit base 10 protrudes from the end wall 12 in the optical axis L2 direction by a predetermined amount, and the other end side protrudes from the front end wall 13 in the optical axis L2 direction by a predetermined amount. Is fixed in a state parallel to the direction of the optical axis L2.

The first guide shaft 31 guides the movable lens groups 50 and 70 (upper optical axis) so as to be slidable in the optical axis L2 direction while being aligned with the reference optical axis L2, and also includes the shutter unit 60 and the image. By incorporating the shake correction unit 80 so as to be slidable in the direction of the optical axis L2, the shutter unit 60 and the image shake correction unit 80 (upper optical axis) serve to match the reference optical axis L2. Yes.
Further, the second guide shaft 32 guides the movable lens groups 50 and 70 so as to be slidable in the direction of the optical axis L2 while restricting the rotation of the movable lens groups 50 and 70 around the first guide shaft 31, and also the shutter unit 60 and the image blur correction. By incorporating the unit 80 so as to be slidable in the direction of the optical axis L2 (however, it is positioned and fixed at a predetermined position in the direction of the optical axis L2 by the positioning recesses 16 and 17 of the unit base 10). The correction unit 80 serves to restrict the rotation of the correction unit 80 around the first guide shaft 31.

As shown in FIG. 7, the fixed lens group 40 includes a lens G <b> 1 and is formed so as to be fitted and fixed to the fixing portion 15 of the unit base 10.
As shown in FIGS. 3 to 6, the movable lens group 50 includes a lens G2, a lens holding frame 51 for holding the lens G2, and the like.
3 to 6, the movable lens group 50 includes a motor 52, a lead screw 53 directly connected to the motor 52, a nut 54 screwed to the lead screw 53, an urging spring 55, and the like. The drive mechanism is appropriately driven in the direction of the optical axis L2 to perform a zoom operation.

As shown in FIGS. 3 and 5, the lens holding frame 51 is formed in a circular shape in which the holding portion 51a for fitting and holding the lens G2 so as to cover the opening and the first guide shaft 31 are slidably fitted. The first fitting hole 51b, a long second fitting hole 51c that allows the second guide shaft 32 to be slidably fitted to restrict rotation around the first guide shaft 31, and a nut 54 are brought into contact with each other. A contact portion 51d, a latching portion 51e for latching one end of the biasing spring 55, and the like are provided.
Here, in the movable lens group 50, the dimensions and the like relating to the separation distance between the first fitting hole 51b and the second fitting hole 51c with respect to the holding portion 51a (center of the opening, optical axis) of the lens holding frame 51 are managed. Manufactured.

As shown in FIGS. 12 to 14, the shutter unit 60 includes a lens G3, a lens holding frame 61 that holds the lens G3, a shutter (not shown) disposed in the lens holding frame 61, and a driving mechanism (not shown). Etc., and a shutter operation is performed in the entire optical imaging system.
As shown in FIGS. 12 to 15, the lens holding frame 61 includes a circular opening 61a, a holding recess 61b for fitting and holding the lens G3 so as to cover the opening 61a, and the opening 61a in the holding recess 61b. The three receiving surfaces 61c formed around the adhesive groove 61d formed stepwise in the optical axis L2 direction from the receiving surface 61c and can be filled with the adhesive, and the step in the optical axis L2 direction from the receiving surface 61c. The first guide shaft 31 is slidably fitted to the prevention wall 61e that is formed to be lowered and stepped up in the direction of the optical axis L2 relative to the adhesive groove 61d to prevent the adhesive from flowing into the opening 61a. A circular first fitting hole 61f, an elongated second fitting hole 61g for slidably fitting the second guide shaft 32 to restrict rotation around the first guide shaft 31, and the unit base 10 3 And a three positioning projections 61h and the like to be fitted in the positioning recess 16.

The three positioning protrusions 61h are formed so as to protrude in a direction perpendicular to the optical axis L2 in a flat plate shape having the same thickness in the optical axis L2 direction.
Here, the shutter unit 60 is manufactured by managing dimensions and the like related to the separation distance of the first fitting hole 61f and the second fitting hole 61g with respect to the holding recess 61a (the center of the opening, the optical axis) of the lens holding frame 61. Is done.
The lens holding frame 61 includes three receiving surfaces 61c, an adhesive groove 61d, and a prevention wall 61e. Therefore, when the lens G3 is fitted and fixed to the lens holding frame 61, the outer edge portion of the lens G3 is attached. Even if the adhesive is poured into the adhesive groove 61d in contact with the three receiving surfaces 61c in the direction of the optical axis L2, the adhesive injected into the adhesive groove 61d runs on the receiving surface 61c by the prevention wall 61e. It is possible to prevent the lens G3 from flowing up to the opening 61a, and thus to prevent the lens G3 from being lifted (tilted) by the adhesive, and to fix the lens G3 at a predetermined position with high accuracy.

As shown in FIGS. 3 to 6, the movable lens group 70 includes a lens G4, a lens holding frame 71 that holds the lens G4, and the like.
As shown in FIGS. 3 to 6, the movable lens group 70 is shared with the motor 72, the lead screw 73 directly connected to the motor 72, the nut 74 screwed to the lead screw 73, and the movable lens group 50. A driving mechanism constituted by a biasing spring 55 and the like is appropriately driven in the direction of the optical axis L2 to perform a focusing operation.
The lens holding frame 71 includes a holding portion 71a for fitting and holding the lens G4 so as to cover the opening, a circular first fitting hole 71b for fitting the first guide shaft 31 slidably, and a first guide. In addition to the elongated second fitting hole 71c in which the second guide shaft 32 is slidably fitted to restrict the rotation around the shaft 31, the contact portion 71d in which the nut 74 is brought into contact, and the biasing spring 55 A latching portion 71e for latching the end is provided.
Here, in the movable lens group 70, the dimensions and the like relating to the separation distance between the first fitting hole 71b and the second fitting hole 71c with respect to the holding portion 71a (the center of the opening, the optical axis) of the lens holding frame 71 are managed. Manufactured.

The image blur correction unit 80 is provided on the fixed frame 81, the lens G5, the movable frame 82 that holds the lens G5, the fixed frame 81, and the movable frame 82, as shown in FIGS. Correction mechanism for correcting image blur due to camera shake or the like in the entire optical imaging system, including a support mechanism that supports the movable frame 82 in a plane perpendicular to the optical axis L2, and a drive mechanism that drives the movable frame 82. Is supposed to do.
As shown in FIGS. 16A and 16B, the fixed frame 81 has an opening 81a, a circular first fitting hole 81b in which the first guide shaft 31 is slidably fitted, and a first guide shaft. The second guide shaft 32 is slidably fitted to the second guide shaft 32 so as to restrict the rotation around 31, the three positioning projections 81 d fitted into the three positioning recesses 17 of the unit base 10, etc. It has.

The three positioning protrusions 81d are formed to protrude in a direction perpendicular to the optical axis L2 in a flat plate shape having the same thickness in the optical axis L2 direction.
The movable frame 82 includes a holding portion 82a that holds the lens G5, and is supported in a two-dimensionally movable manner in a plane perpendicular to the optical axis L2 in the internal space defined by the fixed frame 81.
Here, the image blur correction unit 80 includes a first fitting hole 81b with respect to the opening 81a (the center of the opening, the optical axis) of the fixed frame 81 and the holding portion 81a (the center of the opening, the optical axis) of the movable frame 82. And the dimension regarding the separation distance of the 2nd fitting hole 81c is managed, and it manufactures.

  As shown in FIGS. 3, 4, and 8, the optical filter 90 includes a filter main body 91 and a rectangular holding frame 92, and is formed so as to be fitted and fixed to the fixing portion 18 of the unit base 10. Yes.

As shown in FIGS. 2B, 4 and 8, the sensor unit 100 is formed so as to surround a flat holder plate 101, an image sensor 102 fixed to the holder plate 101, and the periphery of the image sensor 102. A rectangular cylindrical rubber member 103 is provided.
The holder plate 101 includes a fixing portion 101 a that fixes the image sensor 102, a first fitting hole 101 b that allows the first guide shaft 31 to be slidably fitted, and a second guide for restricting rotation around the first guide shaft 31. A long hole-like second fitting hole 101c for fitting the shaft 32 slidably, three through holes 101d for passing three screws, and the like are provided.
Here, in the sensor unit 100, the dimensions and the like related to the separation distance between the first fitting hole 101b and the second fitting hole 101c with respect to the center of the fixing portion 101a of the holder plate 101 (the center of the imaging surface of the imaging element 102) are managed. Manufactured.

When the sensor unit 100 is assembled to the unit base 10, the first guide shaft 31 and the first guide shaft 31 protruding from the rear end wall 12 of the unit base 10 into the first fitting hole 101 b and the second fitting hole 101 c of the sensor unit 100. The two guide shafts 32 are respectively fitted, the rubber member 103 is sandwiched between the unit base 10 (rear end wall 12), and the compression spring 104 is inserted so as to be inserted into the reservoir 12b. The screw B is passed through the through-hole 101d and the compression spring 104, screwed into the screw hole 12a of the unit base 10, and the amount of each screw is adjusted, and the inclination of the sensor unit 100 (imaging surface of the image sensor 102) with respect to the optical axis L2 Then, an adhesive is injected into the reservoir 12b.
Accordingly, the optical axis of the sensor unit 100 (the center of the image sensor 102) can be adjusted with respect to the optical axis L2 with respect to the first guide shaft 31 and the second guide shaft 32, and the optical axis L2 can be adjusted. The inclination can be adjusted (the imaging surface of the imaging element is oriented perpendicularly to the optical axis L2), and the screw B can be firmly fixed and firmly fixed so as not to loosen.

As shown in FIGS. 1, 2A, 3, 4, 5, and 7, the prism unit 110 includes a prism 111 that bends the optical axis from L1 to L2, a holder 112 that holds the prism 111, and the like. Etc.
The holder 112 holds the prism 111 and the like, and a fixing portion 112a, a first fitting hole 112b in which the first guide shaft 31 is slidably fitted, and a rotation to restrict rotation around the first guide shaft 31. (2) An elongated second fitting hole 112c for fitting the guide shaft 32 slidably, three through holes 112d through which the three screws B are passed, a flat surface 112e facing the flat surface 13b of the front end wall 13, etc. I have.
Here, the prism unit 110 is manufactured by managing the dimensions related to the distance between the first fitting hole 112b and the second fitting hole 112c with respect to the center of the fixing portion 112a of the holder 112 (the center of the prism 111).

  When the prism unit 110 is assembled to the unit base 10, the first guide shaft 31 and the second guide shaft 31 project from the front end wall 13 of the unit base 10 into the first fitting hole 112 b and the second fitting hole 112 c of the prism unit 110. The guide shafts 32 are respectively fitted, and three screws B are respectively passed through the through holes 112d and screwed into the screw holes 13a of the unit base 10, and if necessary, the prism unit 110 (the flat surface 112e of the holder 112) and The spacer sheet 120 is sandwiched in the screwed region of the screw B between the unit base 10 (the flat surface 13b of the front end wall 13 thereof), the inclination of the prism unit 110 with respect to the optical axis L2 is adjusted, and the screw is fastened. That is, when the prism unit 110 is fastened to the unit base 10 with the screws B, the inclination of the prism unit 110 with respect to the optical axis L2 can be easily adjusted by appropriately sandwiching the spacer sheet 120 in a region corresponding to the screws B. it can.

Here, the spacer sheet 120 is prepared in advance with, for example, three types of thicknesses within an assumed tilt adjustment range, and the spacer sheet 120 having different thicknesses is sandwiched between the gold sheets as necessary. Even when the dimensions of the molded product fluctuate due to a change in the mold or the like, the inclination can be easily adjusted.
As shown in FIG. 7, the spacer sheet 120 has a horseshoe shape (substantially U-shaped), is inserted around the screw B, and is clamped between the flat surface 13 b and the flat surface 112 e by tightening the screw B. It has become so.
That is, when the prism unit 110 is assembled to the unit base 10, the optical axis alignment is performed by the first guide shaft 31 and the second guide shaft 32, and the inclination adjustment with respect to the optical axis L2 is performed by sandwiching the spacer sheet 120 as appropriate. Therefore, optical axis alignment and tilt adjustment can be performed with high accuracy by a simple assembling operation while achieving a reduction in manufacturing cost.

Next, the assembly of this optical device will be described.
First, the fixed lens group 40 and the optical filter 90 are fixed to the fixing portions 15 and 18 with respect to the unit base 10, and the driving mechanism (the motor 52 and the nut that directly connects the lead screw 53 screwed with the nut 54) to the fixing portion 19. A motor 72 that directly connects a lead screw 73 screwed with 74 is attached, and each optical unit (movable lens group 50, shutter unit 60, movable lens group 70, and image touch correction unit 80) is opened from the opening 11 of the unit base 10. The first guide shaft 31 and the second guide shaft 32 are connected to the first fitting holes 51b, 61f, 71b, 81b and the second fitting holes of each optical unit. 51c, 61g, 71c, and 81c are slid and fitted, and are fitted into the fixing fitting holes 14a and 14b of the unit base 10. To be fixed.
In this way, by fitting and assembling the first guide shaft 31 and the second guide shaft 32 in a skewered manner, the optical axes of all the optical units can be set with reference to the first guide shaft 31 and the second guide shaft 32. They can be assembled so as to be aligned on the optical axis L2.

Subsequently, in order to assemble the sensor unit 100 to the unit base 10, the first guide shaft 31 and the first guide shaft 31 protruding from the rear end wall 12 of the unit base 10 into the first fitting hole 101 b and the second fitting hole 101 c of the sensor unit 100. The two guide shafts 32 are respectively fitted, the rubber member 103 is sandwiched between the unit base 10 (rear end wall 12), and the compression spring 104 is inserted so as to be inserted into the reservoir 12b. The screw B is passed through the through-hole 101d and the compression spring 104, screwed into the screw hole 12a of the unit base 10, and the amount of each screw is adjusted, and the inclination of the sensor unit 100 (imaging surface of the image sensor 102) with respect to the optical axis L2 Then, an adhesive is injected into the reservoir 12b.
As described above, the optical axis of the sensor unit 100 (the center of the image sensor 102) can be aligned with the optical axis L2 with reference to the first guide shaft 31 and the second guide shaft 32, and the optical axis L2. Can be adjusted (the imaging surface of the imaging device is oriented perpendicularly to the optical axis L2), and the screw B can be firmly fixed so as not to loosen.

Further, in order to assemble the prism unit 110 to the sensor base 10, the first guide shaft 31 and the second guide that protrude from the front end wall 13 of the unit base 10 into the first fitting hole 112 b and the second fitting hole 112 c of the prism unit 110. Each of the shafts 32 is fitted, and three screws B are respectively passed through the through holes 112d and screwed into the screw holes 13a of the unit base 10, and the prism unit 110 (the flat surface 112e of the holder 112 thereof) and the unit as necessary. The spacer sheet 120 is sandwiched in the screwed region of the screw B between the base 10 (the flat surface 13b of the front end wall 13 thereof), the inclination of the prism unit 110 with respect to the optical axis L2 is adjusted, and further screwed and fastened.
As described above, the optical axis of the prism unit 110 (the center of the prism 111) can be aligned with the optical axis L2 with reference to the first guide shaft and the second guide shaft, and the spacer sheet 120 is appropriately sandwiched. Accordingly, the tilt adjustment with respect to the optical axis L2 can be easily performed, and the optical axis alignment and the tilt adjustment can be performed with high accuracy by a simple assembling operation while achieving a reduction in manufacturing cost.

  As described above, the plurality of optical units (the movable lens groups 50 and 70 and the shutter unit 60, the image blur correction unit 80), the sensor unit 100, and the prism unit 110 are respectively connected to the first fitting holes 51b, 61f, 71b, 81b, 101b, 112b and the second fitting holes 51c, 61g, 71c, 81c, 101c, 112c are managed with dimensional accuracy between the optical axis L2 (that is, as a tolerance range of the assembled product, two guides The manufacturing cost can be reduced by simply manufacturing the first guide shaft 31 and the second guide shaft 32 that are fitted and fixed to the unit base 10. While achieving reduction, the optical axis can be aligned with high accuracy by a simple assembly operation.

  In the above embodiment, as the optical device, a plurality of optical units (a movable lens group 50 as a movable unit, a shutter unit 60 as a fixed unit, a movable lens group 70 as a movable unit, and a fixed unit are provided for the unit base 10. Although the configuration including the image touch correction unit 80), the sensor unit 100, and the prism unit 110 is shown, the present invention is not limited to this, and a plurality of optical units include only a movable unit or only a fixed unit. Alternatively, the prism unit 110 may not be included.

  As described above, the optical device of the present invention achieves the simplification of the structure, the cost reduction, the ease of assembly work, etc. without increasing the manufacturing accuracy of each component (optical element). Since it can adjust the tilt (bend) with respect to the axis and adjust the position in the optical axis direction with high accuracy, it is mounted on digital cameras or digital video cameras that require miniaturization and thinning, and cellular phones. Of course, the present invention can be applied to an ordinary digital camera or the like, and is also useful for a normal digital camera, other portable optical devices, and a personal computer incorporating the same.

L1, L2 Optical axis 10 Unit base 11 Opening portion 12 Rear end wall 12a Screw hole 12b Reservoir portion 13 Front end wall 13a Screw hole 13b Flat surface 14a, 14b Fixing hole 15 Fixing portion 16 Positioning recess 16a Projection portion 17 Positioning Recessed portion 17a Projection 18 Fixed portion 19 Fixed portion 20 Cover 31 First guide shaft 32 Second guide shaft 40 Fixed lens group G1 Lens 50 Movable lens group (movable unit, optical unit)
G2 lens 51 lens holding frame 51a holding part 51b first fitting hole 51c second fitting hole 51d contact part 51e latching part 52 motor 53 lead screw 54 nut 55 biasing spring 60 shutter unit (fixing unit, optical unit)
G3 lens 61 lens holding frame 61a opening 61b holding recess 61c receiving surface 61d adhesive groove 61e prevention wall 61f first fitting hole 61g second fitting hole 61h positioning projection 70 movable lens group (movable unit, optical unit)
G4 lens 71 lens holding frame 71a holding part 71b first fitting hole 71c second fitting hole 71d abutting part 71e latching part 80 image touch correction unit (fixing unit, optical unit)
G5 lens 81 fixed frame 81a opening 81b first fitting hole 81c second fitting hole 81d positioning projection 82 movable frame 82a holding part 90 fixed lens group 91 filter main body 92 holding frame 100 sensor unit 101 holder plate 101a fixing part 101b first 1 fitting hole 101c 2nd fitting hole 101d Through hole 102 Imaging element 103 Rubber member 104 Compression spring B Screw 110 Prism unit 111 Prism 112 Holder 112a Fixing part 112b First fitting hole 112c Second fitting hole 112d Through hole 112e Flat surface 120 Spacer sheet B Screw

Claims (6)

A plurality of optical units including a movable unit arranged in the optical axis direction to form an optical image and movable in the optical axis direction or a fixed unit stationary in the optical axis direction;
A unit base for accommodating the movable unit or the fixed unit therein;
A sensor unit that holds an image sensor and is connected to a rear end wall of the unit base;
An optical device comprising a first guide shaft and a second guide shaft disposed on the unit base so as to extend in the optical axis direction,
The unit base has a fixing fitting hole for fixing the first guide shaft and the second guide shaft so that the first guide shaft and the second guide shaft protrude from their end walls.
The movable unit or the fixed unit and the sensor unit each have a first fitting hole for slidably fitting the first guide shaft, and the second guide for restricting rotation around the first guide shaft. Having a second fitting hole for slidably fitting the shaft;
An optical device. The plurality of optical units includes a prism unit that holds a prism that bends an optical axis and is coupled to a front end wall of the unit base;
The prism unit slidably fits the second guide shaft so as to restrict rotation around the first guide shaft and a first fitting hole for slidably fitting the first guide shaft. The unit base has a second fitting hole, and after the first guide shaft and the second guide shaft protruding from the front end wall of the unit base are fitted into the first fitting hole and the second fitting hole, respectively. Fastened with multiple screws,
The optical apparatus according to claim 1. A spacer sheet is formed between the prism unit and the front end wall of the unit base so that a spacer sheet can be sandwiched between regions corresponding to the plurality of screws in order to adjust the inclination of the prism unit with respect to the optical axis. Yes,
The optical apparatus according to claim 2. The sensor unit has a plurality of through holes through which the plurality of screws pass.
The unit base has a plurality of screw holes for screwing the plurality of screws, and a plurality of reservoir portions that are respectively formed around the plurality of screw holes and store an adhesive.
The sensor unit is connected to the unit base after the first guide shaft and the second guide shaft protruding from the rear end wall of the unit base in the first fitting hole and the second fitting hole, respectively. It is fastened using a plurality of screws with a compression spring interposed therebetween, and is fixed by an adhesive injected into the reservoir,
The optical device according to claim 1, wherein the optical device is an optical device. The unit base has three positioning recesses formed to position the fixed unit at a predetermined position in the optical axis direction,
The fixed unit has three positioning protrusions fitted into the three positioning recesses of the unit base.
The optical device according to claim 1, wherein the optical device is an optical device. The movable unit or the fixed unit includes a lens and a lens holding frame that fits and holds an outer edge portion of the lens so as to define an opening and cover the opening.
The lens holding frame includes three receiving surfaces that receive an outer edge portion of the lens in the optical axis direction, an adhesive groove that is formed in a step lower than the receiving surface and can be filled with an adhesive, and more than the receiving surface. Having a prevention wall that is formed in a step-down and stepped up from the adhesive groove to prevent the adhesive from flowing into the opening,
The optical device according to claim 1, wherein the optical device is an optical device.

Images