JP2010097019A - Lens shifting device for optical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a smooth motion (movement), by easily improving absolute accuracy and relative accuracy and to achieve saving in space and reduction in size, weight and cost. <P>SOLUTION: A first guide mechanism 3 is configured, in such a manner that a first guide part 14 is arranged in a plurality of positions, the first guide part being configured, in such a manner that the surface of a part of a lens support part 2 and the surface of a part of a first support part 4 come into surface contact with each other; a first engagement pin 11 is erected on one surface; a first slit 12 is formed in the other surface; and the lens support part 2 is brought into press-contact with the first support part 4 by a first spring 13, attached to the first engagement pin 11. A second guide mechanism 5 is configured, in such a manner that a second guide part 18 is arranged in a plurality of positions, the second guide part being configured in such a manner that the surface of a part of the first support part 4 and the surface of a part of a second support part 6 come into surface contact with each other, a second engagement pin 15 is erected on one surface, a second slit 16 with which the second engagement pin 15 is engaged is formed in the other surface, and the first support part 4 is brought into press-contact with the second support part 6 by a second spring 17, attached to the second engagement pin 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens shift device of an optical device for shifting a projection lens provided in an optical device such as a projector in a horizontal direction and a vertical direction.

  Generally, in a projector that projects an image on a screen, it is necessary to project the image to an accurate position on the screen. Therefore, the position of the projection lens is shifted in the horizontal direction and the vertical direction with respect to the projector body to adjust the image position. It is equipped with a lens shift device.

  Conventionally, as this type of lens shift device, a lens shift mechanism disclosed in Patent Document 1 and a lens moving mechanism disclosed in Patent Document 2 are known. The lens shift mechanism of Patent Document 1 includes a lens base to which a projection lens is fixed, and one side of this lens base is engaged with a first screw in a vertical or horizontal direction and rotated by a driving device of the first screw. Is moved in the vertical or horizontal direction, one end of the first screw is engaged with a second orthogonal screw, and one end of the first screw is moved in the horizontal or vertical direction by rotation of the driving device of the second screw. The projection lens can be moved two-dimensionally by moving the lens to the left and right, and the lens base is configured to be guided directly or indirectly by the vertical shift rail and the horizontal shift rail.

The lens moving mechanism of Patent Document 2 includes a lens holding member that holds a lens barrel that includes a projection lens that projects light having image information therein, and the lens holding member is orthogonal to the optical axis of the light. Lens movement provided with a lens holding member guiding means for movably guiding in at least one axial direction, a fixed side support member for supporting the lens holding member guiding means, and a driving force applying means for applying a driving force to the lens barrel The lens holding member guide means is provided with a raceway member provided with a rolling element rolling surface along a longitudinal direction, and a rolling element rolling surface corresponding to the rolling body running surface of the raceway member. A moving member incorporated in a freely movable manner relative to the race member, and a plurality of rolling elements disposed between the rolling member running surface of the race member and the rolling member rolling surface of the moving member. The raceway member is an outer rail made of a plate-like material and having a substantially U-shaped cross-section perpendicular to the longitudinal direction and provided with rolling element rolling surfaces on both inner sides in the width direction. An inner rail made of a material and having a substantially U-shaped cross section perpendicular to the longitudinal direction and provided with rolling element rolling surfaces on both outer sides in the width direction, and each rolling element is rotatably held. A cage is provided.
JP 2005-173460 A JP-A-2005-284130

  However, the conventional lens shift device mounted on the projector has the following problems.

  First, the guide mechanism for shifting the lens in the horizontal direction and the vertical direction needs to arrange a pair of rails or screws along the horizontal direction and the vertical direction, so that smooth movement (movement) is ensured. Requires precision parts and high assembly accuracy, and is forced to increase both the part cost and assembly cost. If precision parts and assembly precision cannot be ensured, the frictional resistance (contact resistance) increases and smoothness increases. It is difficult to secure movement.

  Secondly, relatively large parts such as rails and screws are required, and an arrangement space for assembling them is required, resulting in an increase in size and weight of the apparatus. In addition, since precision is required, there is a difficulty in reliability and stability with respect to long-term use, such as defects that are likely to occur due to changes over time.

  An object of the present invention is to provide a lens shift device for an optical apparatus that solves the problems existing in the background art.

  The present invention includes a first support portion 4 having a first guide mechanism 3 that supports a lens support portion 2 that supports a projection lens L and guides the lens support portion 2 in one of the horizontal direction Fh and the vertical direction Fv, and the first support portion 4. A second support portion 6 having a second guide mechanism 5 that supports the first guide portion 5 in the horizontal direction Fh or the vertical direction Fv, a first moving portion 7 that moves the lens support portion 2, and a first support portion 4. When configuring the lens shift device 1 of the optical device P including the second moving unit 8 to be moved, a part of the surfaces of the lens supporting unit 2 and the first supporting unit 4 are brought into surface contact with each other, so A first engagement pin 11 is erected on one surface of the one support portion 4 in surface contact, and a first slit 12 is formed on the other surface to engage the first engagement pin 11, thereby The lens support 2 is first supported by the first spring 13 attached to the pin 11. The first guide part 14 formed in pressure contact with the first guide part 14 is arranged at a plurality of different positions to constitute the first guide mechanism 3, and the first support part 4 and the second support part 6 are partially connected to each other. The second engagement pin 15 is raised on one surface where the first contact portion 4 or the second support portion 6 is in surface contact, and the second engagement pin 15 is engaged with the other surface. A second guide portion 18 is formed at two or more different positions by forming two slits 16 and pressing the first support portion 4 against the second support portion 6 by a second spring 17 attached to the second engagement pin 15. Thus, the second guide mechanism 5 is configured.

  In this case, according to a preferred aspect of the invention, the lens support portion 2, the first support portion 4, and the second support portion 6 can be formed by flat platen support plate portions 21, 22, and 23, respectively. Further, the lens support portion 2 and the first support portion 4 can be brought into surface contact by providing at least one of contact portions 2c and 4cf formed by raising a part thereof. Further, a guide recess 12s is formed by a step around the first slit 12 in the lens support portion 2 or the first support portion 4, and the first engagement pin 11 is attached to the engagement board portion 24 engaged with the guide recess 12s. The first spring 13 can be mounted between the distal end engaging portion 25 and the engaging disc portion 24 of the first engaging pin 11 while being penetrated. On the other hand, the first support part 4 and the second support part 6 can be brought into surface contact by providing contact parts 4cr, 6c formed by raising a part on at least one side. Further, a guide recess 16s is formed by a step around the second slit 16 in the first support part 4 or the second support part 6, and the second engagement pin 15 is provided on the engagement plate part 26 engaged with the guide recess 16s. And the second spring 17 can be mounted between the distal end engaging portion 27 and the engaging disc portion 26 of the second engaging pin 15. It is desirable to apply the projector Po as the optical device P.

  According to the lens shift device 1 of the optical apparatus P according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) The engagement pin 11 (15) erected on one surface, the slit 12 (16) formed on the other surface and engaged with the engagement pin 11 (15), and the engagement pin 11 (15) A guide portion 14 (18) having a spring 13 (17) that is mounted and press-contacts the lens support portion 2 and the first support portion 4 (the first support portion 4 and the second support portion 6) is arranged at a plurality of different positions. Thus, since the first guide mechanism 3 (second guide mechanism 5) is configured, the plurality of slits 12 ... (16 ...) can be integrally formed in the same plane. Therefore, the length of the slit 12 (16) is sufficient for the necessary moving stroke, and the absolute accuracy and the relative accuracy can be easily increased, and the smooth movement (movement) of the entire guide mechanism can be ensured.

  (2) Since it can be basically constituted by the engaging pin 11 (15), the slit 12 (16) and the spring 13 (17), a small number of parts and small parts are sufficient. Therefore, it is possible to reduce the size and size of the apparatus, save the space associated with assembly, and reduce the weight, and reduce both the component cost and the assembly cost. In addition, since the lens support portion 2 is pressed against the first support portion 4 (the first support portion 4 is contacted with the second support portion 6) by the spring 13 (17), defects such as rattling are unlikely to occur, and reliability for long-term use. And stability can be improved.

  (3) If the lens support portion 2 and the first support portion 4 are brought into surface contact by providing contact portions 2c and 4cf formed by raising a part of the lens support portion 2 and the first support portion 4 in at least one of them, a necessary portion is obtained. Since only surface contact occurs, a smoother movement (movement) can be ensured by reducing the frictional resistance (contact resistance) between the lens support portion 2 and the first support portion 4.

  (4) According to a preferred embodiment, a guide recess 12s having a step is provided around the first slit 12 in the lens support portion 2 or the first support portion 4, and the engagement plate portion 24 engaged with the guide recess 12s If the first spring 13 is mounted between the front end engaging portion 25 and the engaging disc portion 24 of the first engaging pin 11 while penetrating the one engaging pin 11, A more stable guide performance that is less likely to be loose or fluttered can be secured.

  (5) Necessary if the first support portion 4 and the second support portion 6 are brought into surface contact by providing contact portions 4cr, 6c formed by raising a part of the first support portion 4 and the second support portion 6 on at least one side. Since only the part is in surface contact, a smoother movement (movement) can be secured by reducing the frictional resistance (contact resistance) between the first support part 4 and the second support part 6.

  (6) According to a preferred embodiment, a guide recess 16s is formed by a step around the second slit 16 in the first support portion 4 or the second support portion 6, and the engagement plate portion 26 engaged with the guide recess 16s If the second spring 17 is mounted between the front end engaging portion 27 and the engaging disc portion 26 of the second engaging pin 15 while penetrating the second engaging pin 15, the first supporting portion 4 is supported. Therefore, it is possible to secure a more stable guide performance that is less likely to be loose or fluttered.

  (7) According to a preferred embodiment, when the optical device P is applied to the projector Po, the smooth movement (movement) in the lens shift device 1 mounted on the projector Po is ensured, and further, the cost of the projector Po is reduced. It can contribute to miniaturization and weight reduction, and can improve reliability and stability for long-term use.

  Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

  First, the configuration of the lens shift device 1 according to the present embodiment will be described with reference to FIGS.

  The illustrated lens shift device 1 is applied to a large projector Po (optical apparatus P) as shown in FIG. 2, and the projector Po is a projector main body Pom and a projection that is attached to and detached from the projector main body Pom. It consists of a lens (interchangeable lens) L. The illustrated projector Po is for business use, and the projection lens L has an outer diameter of about 10 [cm] to a large size exceeding 10 [cm]. As shown in FIGS. 1 and 2, the projection lens L includes a lens barrel 31, and an outer peripheral surface 31 f of the lens barrel 31 has a flange portion 32 integrally therewith and is rearward from the flange portion 32. Four locking claw pieces 33 are provided at positions separated by a predetermined width. Pc denotes a projector cabinet, and Pco denotes an interchangeable lens attachment / detachment opening provided on the front surface of the projector cabinet Pc. The lens shift device 1 according to this embodiment is disposed behind the interchangeable lens attachment / detachment port Pco and in the vicinity of the interchangeable lens attachment / detachment port Pco.

  The lens shift device 1 includes a lens support portion 2 that detachably supports the projection lens L, a first support portion 4 that supports the lens support portion 2, and a second support portion 6 that supports the first support portion 4. The second support portion 6 is fixed on the inner surface of the bottom surface portion of the projector cabinet Pc. The first support portion 4 is supported on the front surface of the second support portion 6. The first support portion 4 is guided over a predetermined movement stroke in the vertical direction Fv by a second guide mechanism 5 disposed between the first support portion 4 and the second support portion 6. Therefore, this movement stroke corresponds to the shift amount of the projection lens L in the vertical direction Fv. Further, the lens support unit 2 is supported on the front surface of the first support unit 4. The lens support portion 2 is guided over a predetermined movement stroke in the horizontal direction Fh by the first guide mechanism 3 disposed between the lens support portion 2 and the first support portion 4. Therefore, this movement stroke corresponds to the shift amount of the projection lens L in the horizontal direction Fh.

  The lens support portion 2 is formed by a flat support plate portion 21 having a substantially rectangular front shape, and a rib portion 21r for enhancing strength is integrally formed on the front side in the right-angle direction on all (or a part) of the four sides. . Further, a mount portion 35 to which the projection lens L is attached and detached is provided at a substantially central position of the support plate portion 21. The mount portion 35 includes a fixed ring portion 36, and a rotating ring portion 37 that is sandwiched between the fixed ring portion 36 and the support plate portion 21 and has the same inner diameter as the fixed ring portion 36. Therefore, an opening having the same diameter as that of the rotation ring portion 37 and the fixed ring portion 36 is also provided in the support plate portion 21. Further, four notch recesses K are formed on the inner peripheral surfaces of the opening portions of the fixed ring portion 36, the rotation ring portion 37, and the support plate portion 21, respectively. Reference numeral 38 denotes an operation lever portion provided integrally with the rotation ring portion 37, 39 denotes a lock mechanism, and 39s denotes a lock release button of the lock mechanism.

  The first support part 4 is formed by a flat support board part 22 having a substantially rectangular front shape, and a rib part 22r for enhancing strength is integrally formed on the front side in the right-angle direction on all (or part) of the four sides. To do. The width dimension in the vertical direction Fv of the first support part 4 is slightly longer than the width dimension of the lens support part 2, and the width dimension in the horizontal direction Fh is selected to be a width dimension that allows the movement amount of the lens support part 2. To do. In addition, an opening is provided at a substantially central position of the support plate 22, and this opening is selected to have a size that allows the amount of movement (shift amount) of the projection lens L in the horizontal direction Fh.

  The second support portion 6 is formed by a flat support plate portion 23 having a substantially rectangular front shape, and a rib portion 23r for increasing the strength is integrally formed on the front side in a right angle direction on all (or a part) of the four sides. To do. The width dimension in the horizontal direction Fh of the second support part 6 is slightly longer than the width dimension of the first support part 4, and the width dimension in the vertical direction Fv is a width dimension that allows the movement amount of the first support part 4. Select In addition, an opening is provided at a substantially central position of the support plate portion 23, and this opening is selected to have a size that allows the movement amount (shift amount) of the projection lens L in the horizontal direction Fh and the vertical direction Fv.

  A first guide mechanism 3 is disposed between the lens support portion 2 and the first support portion 4. As shown in FIG. 3, the first guide mechanism 3 includes four first guide portions 14... Arranged at the four corner positions of the lens support portion 2. One first guide portion 14, that is, the first guide portion 14 disposed in the lower right corner in FIG. 3, includes a first engagement pin 11 erected from the surface of the first support portion 4, and the lens support portion 2. A first slit 12 which is formed on the surface of the first engagement pin 11 and engages with the first engagement pin 11, and a first spring 13 which is attached to the first engagement pin 11 and presses the lens support portion 2 against the first support portion 4. Prepare. In this case, the first slit 12 is formed along the horizontal direction Fh from the corner of the lens support portion 2, and the length thereof corresponds to the shift amount of the projection lens L in the horizontal direction Fh. As shown in FIGS. 5 and 6, a guide recess 12 s due to a step is provided on the front surface (projection lens L side) around the first slit 12 and on the front surface of the lens support portion 2. A contact portion 2c formed by raising a part of the rear surface is provided. As shown in FIG. 6, the shape of the contact portion 2c can be made to substantially match the shape of the guide recess 12s, and the surface facing the first support portion 4 is formed as a flat surface.

  On the other hand, a contact portion 4cf is formed on the front surface of the first support portion 4 so as to be partly raised and in surface contact with the contact portion 2c. The surface of the contact portion 4cf that faces the contact portion 2c is formed as a flat surface, and the shape and position are selected so as to make surface contact with the contact portion 2c in the movement range of the lens support portion 2. Further, as shown in FIG. 6, the first engagement pin 11 includes an engagement collar portion 11 c integrally including a cylindrical pin body portion 11 m having a screw hole formed therein and a large-diameter engagement board portion 24. And a tip collar portion 11s integrally including a large-diameter tip engagement portion 25. Note that the engagement collar portion 11c is preferably formed of a material having a particularly small friction coefficient.

  Therefore, the first guide portion 14 can be assembled as follows. First, the fixing screw 51 is penetrated from the rear surface side of the first support portion 4 to a substantially central position of the contact portion 4cf and screwed to one end of the pin main body portion 11m, so that the pin main body portion from the substantially central position of the contact portion 4cf. 11m is set up at a right angle. Then, the pin main body 11m is inserted through the first slit 12 from the contact portion 2c side of the lens support portion 2, and the engagement collar portion 11c, the first spring 13, and the front end collar from the front end side with respect to the pin main body portion 11m. The portions 11s are sequentially attached, and after the attachment, the fixing screw 52 is screwed to the other end (tip) of the pin main body portion 11m. As a result, the engaging collar portion 11c engages with the first slit 12 and is guided along the first slit 12, and the engaging disc portion 24 engages with the guide recessed portion 12s. Guided along. The engagement collar portion 11c (engagement board portion 24) is rotatable with respect to the pin main body portion 11m. Further, since the engagement plate portion 24 is pressurized by the first spring 13 interposed between the front end engagement portion 25 and the engagement plate portion 24, the engagement plate portion 24 is pressed against the guide recess 12s and the contact portion. 2c is in pressure contact with the contact portion 4cf. As mentioned above, although the structure of one 1st guide part 14 distribute | arranged to the lower right corner was demonstrated, the other three 1st guide parts 14 ..., ie, the 1st guide part 14 distribute | arranged to the upper right corner, the upper left corner, and the lower left corner. The one guide portion 14 is similarly configured.

  Further, a second guide mechanism 5 is disposed between the first support part 4 and the second support part 6. As shown in FIG. 3, the second guide mechanism 5 includes four second guide portions 18... Arranged at the four corner positions of the first support portion 4. One second guide portion 18 is formed on the surface of the second support portion 6 and the second engagement pin 15 is formed on the surface of the first support portion 4 so that the second engagement pin 15 is engaged therewith. Two slits 16 and a second spring 17 that is attached to the second engagement pin 15 and presses the first support portion 4 against the second support portion 6 are provided. In this case, the second slit 16 is formed from the corner of the first support portion 4 along the vertical direction Fv, and the length thereof corresponds to the shift amount of the projection lens L in the vertical direction Fv. Similarly to the case of the first slit 12, a guide recess 16 s is provided around the second slit 16 on the front surface of the first support portion 4, and a step is provided on the rear surface of the first support portion 4. The contact part 4cr formed by raising the part is provided. The shape of the contact portion 4cr can be made substantially coincident with the shape of the guide recess 16s, and the surface facing the second support portion 6 is formed as a flat surface.

  On the other hand, a contact portion 6c is formed on the front surface of the second support portion 6 so as to be partly raised and in surface contact with the contact portion 4cr. The surface of the contact portion 6c facing the contact portion 4cr is formed as a flat surface, and the shape and position are selected so as to make surface contact with the contact portion 4cr in the moving range of the first support portion 4. The second engagement pin 15 is configured in the same manner as the first engagement pin 11. In the second engagement pin 15, reference numeral 15c denotes an engagement collar portion, 26 denotes an engagement plate portion, and 27 denotes a tip engagement portion. Also in the case of the second engagement pin 15, the engagement collar portion 15c engages with the second slit 16, is guided along the second slit 16, and the engagement disc portion 26 engages with the guide recess 16s. Then, it is guided along the guide recess 16s. Further, since the engagement plate portion 26 is pressurized by the second spring 17 interposed between the tip engagement portion 27 and the engagement plate portion 26, the engagement plate portion 26 is in pressure contact with the guide recess 16s and the contact portion. 4cr is in pressure contact with the contact portion 6c. The configuration of one second guide portion 18 has been described above, but the other three first guide portions 18.

  On the other hand, as indicated by phantom lines in FIG. 3, a first moving portion 7 for moving the lens support portion 2 in the horizontal direction Fh is attached to the right end portion of the first support portion 4 in the drawing, A second moving portion 8 for moving the first supporting portion 4 (lens supporting portion 2) in the vertical direction Fv is attached to the left end portion of the supporting portion 6 in the drawing. The first moving unit 7 includes a drive motor 61 and a motion conversion mechanism 62 that converts the rotational motion of the drive motor 61 into a straight forward motion in the horizontal direction Fh and transmits it to the lens support unit 2, and the second moving unit 8 includes The drive motor 63 and a motion conversion mechanism 64 that converts the rotational motion of the drive motor 63 into a linear motion in the vertical direction Fv and transmits it to the first support portion 4 are provided. In addition, although the illustrated 1st moving part 7 and the 2nd moving part 8 were comprised by the electric system, you may comprise by the manual system which moves by operating an operation dial etc. artificially.

  Next, functions (operations) of the lens shift device 1 according to the present embodiment will be described with reference to the drawings.

  First, the projection lens L is attached to the lens support portion 2. In this case, if the rotation ring portion 37 is set at the position shown in FIG. 3, that is, if the notch recess K of the rotation ring portion 37 is rotationally displaced to a position corresponding to the notch recess K of the fixed ring portion 36. The lens barrel 31 of the projection lens L can be inserted into the mount portion 35 from the rear end side. When the lens barrel 31 is inserted into the mount portion 35, the locking claw pieces 33 are inserted into the notch recesses K and the flange portion 32 is brought into contact with the fixing ring portion 36. As a result, the locking claw pieces 33 are positioned in the notch recesses K of the rotation ring portion 37. Therefore, if the operation lever portion 38 is rotated to the right from the position shown in FIG. The ring portion 37 is rotationally displaced, and the locking claw piece portions 33 are sandwiched between the fixed ring portion 36 and the support plate portion 21, and are held and fixed. At the same time, the position of the operation lever portion 38 (the rotation ring portion 37) is automatically locked by the lock mechanism 39. Thus, the projection lens L can be attached to the lens support portion 2 with one touch. On the other hand, when the projection lens L is detached, the lock mechanism 39 can be unlocked by pressing the lock release button 39s with the hand, so the operation lever portion 38 is moved to the left while the lock release button 39s is pressed with the hand. 3 can be returned to the state shown in FIG. 3, and the projection lens L can be detached.

  The operation of the lens shift device 1 is performed as follows. First, the lens support unit 2 can be moved in the horizontal direction Fh by drivingly controlling the drive motor 61 of the first moving unit 7. When the lens support portion 2 is moved, the positions of the first slits 12 and the guide recess portions 12s formed at the four corners of the lens support portion 2 are regulated in the vertical direction Fv by the engagement collar portion 11c and the engagement plate portion 24, respectively. Since the movement in the horizontal direction Fh is allowed, the lens support portion 2 can be moved in the horizontal direction Fh, that is, the projection lens L can be shifted in the horizontal direction Fh. At this time, since the lens support portion 2 and the first support portion 4 are provided with contact portions 2c and 4cf formed by raising a part of the lens support portion 2 and the first support portion 4, only the necessary portions are in surface contact with each other. By reducing the frictional resistance (contact resistance) between them, a smoother movement (movement) is ensured. In addition, a guide recess 12s is formed around the first slit 12 by a step, and the first engagement pin 11 is passed through the engagement board portion 24 engaged with the guide recess 12s. Since the first spring 13 is mounted between the distal end engaging portion 25 and the engaging disc portion 24, a more stable guide performance that is less likely to be rattled or fluttered with respect to the lens support portion 2 is secured.

  On the other hand, by controlling the drive motor 63 of the second moving unit 8, the first support unit 4 (lens support unit 2) can be moved in the vertical direction Fv. When the first support portion 4 moves, the second slits 16 and the guide recess portions 16s formed at the four corners of the first support portion 4 are positioned in the horizontal direction Fh by the engagement collar portion 15c and the engagement plate portion 26, respectively. Since the movement is restricted and the movement in the vertical direction Fv is allowed, the first support portion 4 can be moved in the vertical direction Fv, that is, the projection lens L can be shifted in the vertical direction Fv. At this time, since the first support portion 4 and the second support portion 6 are provided with contact portions 4cr and 6c formed by raising a part of the first support portion 4 and the second support portion 6, only the necessary portions are in surface contact with each other. By reducing the frictional resistance (contact resistance) between the parts 6, smoother movement (movement) is ensured. Further, a guide recess 16s is formed around the second slit 16 by a step, and the second engagement pin 15 is passed through the engagement plate portion 26 engaged with the guide recess 16s. Since the second spring 17 is mounted between the distal end engaging portion 27 and the engaging disc portion 26, a more stable guide performance is ensured with respect to the first support portion 4 and is less likely to be rattled or fluttered.

  Thus, according to the lens shift device 1 according to the present embodiment, a part of the surfaces of the lens support portion 2 and the first support portion 4 are brought into surface contact with each other, and the first engagement with the surface of the first support portion 4 is performed. A pin 11 is erected, a first slit 12 is formed on the surface of the lens support 2, and the lens support 2 is pressed against the first support 4 by a first spring 13 attached to the first engagement pin 11. The first guide portions 14 are arranged at the four corner positions of the lens support portion 2 to constitute the first guide mechanism 3 that shifts the projection lens L in the horizontal direction Fh, and the first support portion 4 and the second support portion. A part of surfaces of the portion 6 are brought into surface contact with each other, a second engagement pin 15 is provided on the surface of the second support portion 6, and a second slit 16 is formed on the surface of the first support portion 4. The first support portion 4 is pressed against the second support portion 6 by the second spring 17 attached to the two engagement pins 15. The second guide portions 18 are arranged at the four corner positions of the first support portion 4 to constitute the second guide mechanism 5 that shifts the projection lens L in the vertical direction Fv. The two slits 16 can be integrally formed in the same plane. Therefore, the lengths of the first slits 12... And the second slits 16 are sufficient for the necessary movement stroke, and the absolute accuracy and the relative accuracy can be easily increased, and the entire guide mechanism can be smoothly moved (moved). Can be secured. In addition, basically, since it can be constituted by the first engagement pin 11 (second engagement pin 15), the first slit 12 (second slit 16) and the first spring 13 (second spring 17), there are few parts. Score and small parts are enough. Therefore, the overall configuration can be reduced in size, space can be saved, and the weight can be reduced. In addition, both the component cost and the assembly cost can be reduced. In addition, since the lens support portion 2 is pressed against the first support portion 4 (the first support portion 4 is brought into contact with the second support portion 6) by the first spring 13 (second spring 17), defects such as rattling are less likely to occur. , Reliability and stability for long-term use can be improved. In particular, if the optical device P is applied to the projector Po as shown in FIG. 2, the smooth movement (movement) in the lens shift device 1 mounted on the projector Po is ensured, and further the cost of the projector Po is reduced. , It can contribute to miniaturization and weight reduction, and can improve the reliability and stability for long-term use.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and departs from the gist of the present invention in the detailed configuration, shape, material, quantity, numerical value, and the like. It can be changed, added, or deleted as long as it is not. For example, the lens support portion 2, the first support portion 4, and the second support portion 6 are shown as being formed by flat support plate portions 21, 22, and 23, respectively, but are configured by a combination of frames. It does not exclude other structures. Moreover, although the case where the contact parts 2c and 4cf were provided in both the lens support part 2 and the 1st support part 4 was shown, either one may be sufficient. Similarly, although the case where the contact portions 4cr and 6c are provided on both the first support portion 4 and the second support portion 6 is shown, either one may be used. Furthermore, although the 1st spring 13 and the 2nd spring 17 illustrated the coil spring, it is the concept containing various elastic members, such as a leaf | plate spring and rubber | gum. The projector Po is preferably applied to the optical device P, but can be applied (utilized) to various optical devices P other than the projector Po.

The side cross-section block diagram containing the partial extraction enlarged view of the lens shift device concerning the best embodiment of the present invention, A partial external view of a projector equipped with the lens shift device, Front configuration diagram including a partially extracted enlarged view of the lens shift device, Sectional side view of the first guide portion in the lens shift device, Sectional front view at the position of the first slit of the first guide portion in the lens shift device, An exploded side view of the first guide part in the lens shift device,

Explanation of symbols

  1: lens shift device, 2: lens support portion, 2c: contact portion, 3: first guide mechanism, 4: first support portion, 4cf: contact portion, 4cr: contact portion, 5: second guide mechanism, 6: Second support portion, 6c: contact portion, 7: first moving portion, 8: second moving portion, 11: first engaging pin, 12: first slit, 12s: guide recess, 13: first spring, 14 : 1st guide part, 15: 2nd engagement pin, 16: 2nd slit, 16s: Guide recessed part, 17: 2nd spring, 18: 2nd guide part, 21: Supporting board part, 22: Supporting board part, 23: support plate part, 24: engagement board part, 25: tip engagement part, 26: engagement board part, 27: tip engagement part, L: projection lens, Fh: horizontal direction, Fv: vertical direction, P : Optical equipment, Po: Projector

Claims (7)

  A first support portion having a first guide mechanism that supports a lens support portion that supports the projection lens and guides it in one of the horizontal direction and the vertical direction, and the other of the horizontal direction and the vertical direction that supports the first support portion. In a lens shift device for an optical apparatus, comprising: a second support portion having a second guide mechanism for guiding the first support portion; a first moving portion that moves the lens support portion; and a second moving portion that moves the first support portion. A part of surfaces of the lens support part and the first support part are brought into surface contact with each other, and a first engagement pin is provided on one surface of the lens support part or the first support part in contact with the surface, A first slit for engaging the first engagement pin is formed on the other surface, and the lens support portion is pressed against the first support portion by a first spring attached to the first engagement pin. Arrange the first guide part at different positions. By configuring the first guide mechanism, the first support portion and the second support portion are partially brought into surface contact with each other, and the first support portion or the second support portion is in surface contact with each other. A second engagement pin is erected on the surface and a second slit is formed on the other surface to engage the second engagement pin, and the first spring is attached to the second engagement pin by the first spring. A lens shift device for an optical apparatus, wherein the second guide mechanism is configured by disposing a second guide portion formed by pressing the support portion against the second support portion at a plurality of different positions.   2. The lens shift device for an optical apparatus according to claim 1, wherein the lens support part, the first support part, and the second support part are each formed by a flat support board part.   3. The lens shift device for an optical apparatus according to claim 2, wherein the lens support portion and the first support portion are brought into surface contact by providing a contact portion formed by raising a part of at least one of the lens support portion and the first support portion.   A guide recess having a step is provided around the first slit in the lens support portion or the first support portion, and the first engagement pin is passed through an engagement plate portion engaged with the guide recess, and the first 4. The lens shift device for an optical apparatus according to claim 1, wherein the first spring is mounted between a tip engaging portion of one engaging pin and the engaging plate portion.   3. The lens shift device for an optical apparatus according to claim 2, wherein the first support part and the second support part are brought into surface contact by providing a contact part formed by raising a part of at least one of the first support part and the second support part.   A guide recess is formed by a step around the second slit in the first support portion or the second support portion, and the second engagement pin is passed through an engagement board portion engaged with the guide recess. 6. The lens shift device for an optical apparatus according to claim 1, wherein the second spring is mounted between a front end engaging portion of the second engaging pin and the engaging disc portion.   The lens shift device for an optical apparatus according to claim 1, wherein the lens shift apparatus is applied to a projector as an optical apparatus.

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