JP4178556B2 - Lens device - Google Patents

Description

  The present invention relates to a lens apparatus, and more particularly to a lens apparatus used in a retractable camera having a zoom function.

  A cam mechanism is known as means for moving the lens tube along the optical axis. The cam mechanism, for example, is provided with three cam pins on the outer peripheral surface of the lens cylinder, and engages the cam pins with three rectilinear holes formed in the fixed cylinder, and in the three cam grooves formed in the rotating cylinder. It is configured by engaging. Alternatively, three cam pins are provided on the outer peripheral surface of the lens cylinder, and the cam pins are engaged with the three cam holes formed in the fixed cylinder, and are engaged with the three rectilinear grooves formed in the rotating cylinder. It is constituted by. In the cam mechanism configured as described above, when the rotating cylinder is rotated, the lens cylinder moves by the amount of displacement along the optical axis of the cam groove.

By the way, this cam mechanism has a structure in which a plurality of lens cylinders can be moved by a single rotating cylinder. In this case, the inner peripheral surface of the rotating cylinder has a lens cylinder to be moved. As many cam grooves or straight grooves are formed. Conventionally, when the cam groove and the rectilinear groove are formed in one rotating cylinder, they are provided independently so as not to cross each other.
Japanese Patent Laid-Open No. 10-282394

  However, if each is formed independently on the inner peripheral surface of the rotating cylinder so that the cam groove and the straight groove do not intersect with each other, the inclination of the cam groove becomes steep, and the operating load increases to stabilize the lens cylinder. There was a drawback that it could not be operated. On the other hand, if the inclination of the cam cylinder is made gentle in order to operate the lens cylinder stably, there is a drawback that the lens barrel becomes large in diameter and the lens apparatus cannot be downsized.

  On the other hand, the applicant of the present invention has proposed a zoom lens device that shortens the total length in the optical axis direction by forming cam grooves intersecting each other on the inner peripheral surface of the rotating cylinder. As disclosed in Japanese Patent No. 282394, when the cam grooves are intersected, the position of the intersecting portion is limited, and there is a disadvantage that the degree of freedom in design is low.

  That is, when the cam grooves intersect each other, if the two cam grooves do not intersect at a certain angle, the cam pin passing through each cam groove is guided to the other cam groove at the intersection. For this reason, when the cam grooves intersect each other, first, the two cam grooves must be collated, and the position should be considered so that the cam grooves intersect at a certain angle. As a result, the degree of freedom in design is reduced.

  In addition, the cam groove intersection position selected in this way and the cam groove intersection position that is optimal for minimizing the diameter of the lens barrel are not always the same. There was a limit to miniaturizing the lens barrel by crossing the grooves.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lens device that can be downsized while ensuring a stable operation of the cylinder.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a cam groove having a zooming region for causing a lens to perform a zooming operation and a storage region for performing a storing operation, and an inner periphery of a cylinder having the same rectilinear groove In the lens device formed on the surface, the rectilinear groove is formed shallower than the cam groove, and a pin engaged with the cam groove is engaged with the rectilinear groove when sliding in the storage area. The lens device is characterized in that the straight groove and the cam groove are formed to intersect with each other so that the pin to be joined passes through the intersection.

  According to a second aspect of the present invention, in order to achieve the above object, the pin that engages with the cam groove is formed on a storage engagement portion and on the same axis as the top of the storage engagement portion. The cam groove engages with the zooming engagement portion of the cam pin in the zooming region and engages with the storage engagement portion of the campin in the storage region. The lens apparatus according to claim 1, wherein the lens apparatus is formed as described above.

  The invention according to claim 3 is characterized in that, in order to achieve the object, the length of the pin engaged with the rectilinear groove is formed longer than the width of the cam groove at the intersecting portion. Or the lens apparatus of 2 is provided.

  In order to achieve the above object, according to the present invention, in the lens device in which the rectilinear groove and the cam groove are formed on the inner peripheral surface of the cylindrical body, the rectilinear groove and the cam groove are formed so as to intersect with each other. A lens device is provided.

  According to the present invention, the cam groove and the rectilinear groove are crossed and formed on the inner peripheral surface of the cylindrical body. As a result, the inclination of the cam groove can be freely set regardless of the rectilinear groove, so that each cylinder can be stably operated and the lens device can be miniaturized as much as possible. That is, since the rectilinear groove is formed in parallel with the optical axis, it does not affect the diameter of the cylindrical body at any position where it intersects the cam groove. For this reason, the cam groove and the rectilinear groove can be crossed at the position where the crossing angle is the largest. As a result, the diameter of the cylinder can be reduced as much as possible while ensuring stable operation of the cylinder.

  In order to achieve the above object, the present invention provides the lens device according to claim 1, wherein the rectilinear groove and the cam groove are formed at different depths.

  According to the present invention, by forming the rectilinear groove and the cam groove at different depths, the cam pin engaged with the rectilinear groove can be prevented from entering the cam groove, and the cam pin engaged with the cam groove can be rectilinearly advanced. It can prevent entering into the groove.

  Further, in order to achieve the above object, the present invention provides the cam groove, which includes a zooming area for performing a zooming operation on a lens cylinder engaged via a cam pin and a storage area for performing a storing operation. The lens device according to claim 1 or 2, wherein the straight grooves intersect each other.

  According to the present invention, in a lens apparatus that has a zoom function and in which the lens barrel is extended from the camera body only when in use, the straight groove is intersected in the cam groove storage area, so that the cam pin can be connected to the cam pin at the intersection. Even if it is caught, it can be operated without affecting the optical performance.

  In order to achieve the above object, the present invention provides a lens in which a plurality of first grooves are formed at predetermined intervals on the inner peripheral surface of the cylindrical body, and a plurality of second grooves are formed at predetermined intervals. In the apparatus, the first groove and the second groove are formed at unequal intervals in the circumferential direction, so that the first groove and the second groove are formed so as to intersect with each other, and each intersection position is photographed. Provided is a lens device that is shifted along an optical axis.

  According to the present invention, the timing at which each cam pin passes through the intersection can be shifted by shifting the intersection position of the first groove and the second groove in the direction of the photographing optical axis, and malfunction due to a catch at the intersection. Can be prevented.

  In order to achieve the above object, the present invention provides a lens device in which a plurality of first grooves and a plurality of second grooves are formed on an inner peripheral surface of a cylindrical body. The first groove and the second groove are formed so as to intersect each other by shifting the formation positions of the two grooves along the photographing optical axis, and the respective intersecting positions are shifted along the photographing optical axis. A lens device.

  According to the present invention, the timing at which each cam pin passes through the intersection can be shifted by shifting the intersection position of the first groove and the second groove in the direction of the photographing optical axis, and malfunction due to a catch at the intersection. Can be prevented.

  In order to achieve the above object, according to the present invention, in the lens device in which the first groove and the second groove are formed on the inner peripheral surface of the cylindrical body, the first groove and the second groove intersect each other. And a length of the cam pin that engages with the first groove is longer than the width of the second groove at the intersection.

  According to the present invention, the cam pin engaging with the first groove is formed longer than the width of the second groove at the intersecting portion, so that the cam pin engaging with the first groove enters the second groove. Can be prevented.

  As described above, according to the present invention, the cam groove and the rectilinear groove are crossed and formed on the inner peripheral surface of the cylindrical body. As a result, the inclination of the cam groove can be freely set regardless of the rectilinear groove, so that each cylinder can be stably operated and the lens device can be miniaturized as much as possible. That is, since the rectilinear groove is formed in parallel with the optical axis, it does not affect the diameter of the cylindrical body at any position where it intersects the cam groove. For this reason, the cam groove and the rectilinear groove can be crossed at the position where the crossing angle is the largest. As a result, the diameter of the cylinder can be reduced as much as possible while ensuring stable operation of the cylinder.

  Hereinafter, preferred embodiments of a lens apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an external configuration of an electronic still camera to which a lens apparatus according to the present invention is applied.

  As shown in the figure, the electronic still camera 1 has a camera body formed in a rectangular box shape. A lens device 2, a finder window 3, a strobe light control sensor 4, a self-timer lamp are provided on the front of the electronic still camera 1. 5 etc. are arranged. Further, a pop-up strobe 6 and a release switch 7 are disposed on the upper surface portion, and a finder eyepiece, a liquid crystal display panel, operation keys and the like (not shown) are disposed on the rear surface portion. The electronic still camera 1 is of a retractable type, and the lens apparatus 2 has its lens barrel extended from the camera body and protrudes from the front part of the camera body only when in use.

  FIG. 2 is an exploded perspective view of the lens apparatus 2 applied to the electronic still camera 1 described above. 3 to 5 are side sectional views of the lens apparatus 2 applied to the electronic still camera 1 described above. FIG. 3 shows the lens apparatus 2 in the retracted position, and FIGS. 4 and 5 show the lens apparatus 2 in the tele position and the wide position, respectively. ing.

  As shown in FIGS. 2 to 5, the lens device 2 includes a first lens 11, a second lens 12, a first lens tube 13, a second lens tube 14, a moving tube 15, a fixed tube 16, and a rotating tube 17. It is configured.

  The rotating cylinder 17 has a gear portion 18 formed on the outer peripheral surface thereof. The drive of the zoom motor 19 is transmitted to the gear portion 18. The rotating cylinder 17 is rotated while being in contact with the outer periphery of the fixed cylinder 16 by transmitting the driving of the zoom motor 19 to the gear portion 18.

  Here, in the lens device 2, the rotating cylinder 17 rotates in the “storage rotation area” from the “initial position” to the “intermediate position”, so that the state changes from the retracted position state shown in FIG. In addition, the rotating cylinder 17 is rotated in the “magnification rotation range” from the “intermediate position” to the “end position” so that the state is the tele position state shown in FIG. To the wide position shown in FIG.

  A second lens cam groove 21 for moving the second lens cylinder 14 along the optical axis 20 and a movable cylinder 15 are guided along the optical axis 20 on the inner peripheral surface of the rotary cylinder 17. For this purpose, a straight moving groove 22 for moving cylinders is formed in three divided positions around the optical axis 20, respectively.

  The fixed cylinder 16 includes a second lens rectilinear hole 23 for linearly guiding the second lens cylinder 14 along the optical axis 20, and a movable cylinder for moving the movable cylinder 15 along the optical axis 20. The cam holes 24 are formed in three divided positions around the optical axis 20.

  On the outer peripheral surface of the movable barrel 15, a movable barrel cam pin 25 is provided at a three-divided position around the optical axis 20. The moving cylinder cam pin 25 is engaged with a moving cylinder cam hole 24 formed in the fixed cylinder 16 and a moving cylinder linear groove 22 formed in the rotating cylinder 17.

  A first lens cam groove 26 for moving the first lens cylinder 13 along the optical axis 20 is formed on the inner peripheral surface of the movable cylinder 15 at three divided positions around the optical axis 20. ing.

  The first lens cylinder 13 holds the first lens 11 at the inner periphery of the front end. A pair of rectilinear guide grooves 27 are formed along the optical axis 20 at a predetermined interval on the inner peripheral surface of the first lens cylinder 13. A rectilinear guide protrusion 30 formed on the arm 38 of the second lens cylinder 14 is engaged with the rectilinear guide groove 27.

  A first lens cam pin 28 is provided on the outer peripheral surface of the first lens cylinder 13 at three divided positions around the optical axis 20. The first lens cam pin 28 is engaged with a first lens cam groove 26 formed on the inner peripheral surface of the movable cylinder 15.

  On the outer peripheral surface of the second lens cylinder 14, a second lens cam pin 29 is provided at a three-divided position around the optical axis 20. The second lens cam pin 29 is engaged with a second lens cam groove 21 formed in the inner peripheral surface of the rotary cylinder 17 and a second lens straight advance hole 23 formed in the fixed cylinder 16. .

  A pair of springs 37 are hung on the rear end portion of the second lens tube 14 between the rear end portion of the fixed tube 16. The spring 37 is provided at a two-divided position around the optical axis 20 and biases the second lens cylinder 14 toward the image plane.

  A pair of arms 38 are integrally formed at a predetermined interval at the front end of the second lens cylinder 14. The arm 38 has a narrow shape extending from the front end of the second lens cylinder 14 toward the subject, and a rectilinear guide protrusion 30 is integrally formed on the outer periphery of the front end. The rectilinear guide protrusions 30 are engaged with rectilinear guide grooves 27 formed on the inner peripheral surface of the first lens cylinder 13, and both wall surfaces 30 a and 30 b are formed on the both wall surfaces 27 a and 27 b of the rectilinear guide groove 27. It is in contact. The first lens cylinder 13 is guided linearly in the optical axis direction with respect to the second lens cylinder 14 by the rectilinear guide protrusion 30 and the rectilinear guide groove 27 in a state where the rotation is stopped.

  Here, the second lens tube 14 is formed of an elastically deformable material such as plastic, and each arm 38 is formed in a state where its front end is spread outward in the radial direction. For this reason, when the rectilinear guide protrusion 30 is engaged with the rectilinear guide groove 27, the distal end portion 30 c of the rectilinear guide protrusion 30 presses the bottom 27 c of the rectilinear guide groove 27. Accordingly, the first lens cylinder 13 is supported so as not to be inclined with respect to the second lens cylinder 14.

  The straight guide protrusion 30 has a hemispherical tip surface 30c in order to reduce resistance during sliding. That is, the cross section along the optical axis 20 and the cross section perpendicular to the optical axis 20 are each formed in an arc shape. Thereby, the relative movement between the first lens cylinder 13 and the second lens cylinder 14 becomes smooth, and the rotational load on the rotary cylinder 17 is reduced.

  As shown in FIGS. 3 to 5, the second lens 12 is held by a second lens frame 33 that is movably provided along the optical axis 20 in the second lens cylinder 14. The second lens frame 33 is provided so as to be movable along the optical axis 20 in the second lens cylinder 14 by a feed screw 31 and a guide rod 32. A focus motor 34 is connected to the feed screw 31. By driving the focus motor 34, the second lens 12 moves in the optical axis direction according to the lead of the feed screw 31.

  The movement of the second lens 12 is performed between an “origin position” that is closest to the image plane 10 a side with respect to the second lens cylinder 14 and a position that is away from the origin position toward the subject. . At the time of zooming, the second lens 12 is located at the “origin position”.

  FIG. 7 is a development view showing the configuration of the first lens cam groove 26 provided in the movable cylinder 15.

  A first lens cam pin 28 provided in the first lens tube 13 is engaged with the first lens cam groove 26. The first lens cam groove 26 includes a first lens storage preparation guide part 42, a first lens movement prevention part 43, and a first lens scaling guide part 44.

  The first lens storage preparation guide section 42 is a range in which the first lens cam pin 28 slides when the rotary cylinder 17 rotates in the rotation range from the “initial position” to the “rotation position A”. The first lens storage preparation guide section 42 includes a “retraction position” in which the first lens cylinder 13 is retracted toward the image plane with respect to the movable cylinder 15, and a “storage preparation position” slightly protruding toward the subject side. Move between. When the lens apparatus 2 is in the retracted position, the first lens cylinder 13 is in the “retracted position”.

  The first lens movement prevention unit 43 is a range in which the first lens cam pin 28 slides when the rotary cylinder 17 rotates in the rotation range from the “rotation position A” to the “intermediate position”. The first lens movement blocking unit 43 allows the rotation of the moving cylinder 15 and prevents the first lens cylinder 13 from moving from the “storage preparation position” in the optical axis direction. It is formed along. Thereby, the first lens cylinder 13 is maintained at the “storage preparation position” until the lens apparatus 2 is changed from the retracted position to the tele position.

  The first lens magnification guide portion 44 is a range in which the first lens cam pin 28 slides when the rotary cylinder 17 rotates in the “magnification rotation range” from the “intermediate position” to the “end position”. . The first lens zoom guide 44 has a shape that moves the first lens cylinder 13 along the optical axis 20 in order to change the focal length.

  The first lens storage preparation guide section 42 described above is not necessarily required, and the first lens movement prevention section is configured so that the entire rotation area of the movable cylinder 15 corresponding to the “storage rotation area” of the rotation cylinder 17 is omitted. It may be 43.

  FIG. 8 is a development view showing the configuration of the moving barrel cam hole 24 and the second lens rectilinear hole 23 provided in the fixed barrel 16.

  First, the configuration of the movable cylinder cam hole 24 will be described. A cam hole engaging portion 25 </ b> A of a moving cylinder cam pin 25 provided in the moving cylinder 15 is engaged with the moving cylinder cam hole 24. The moving cylinder cam hole 24 is composed of a moving cylinder storage guide section 40 and a moving cylinder movement blocking section 41.

  The moving cylinder storage guide portion 40 is a range in which the moving cylinder cam pin 25 slides when the rotating cylinder 17 rotates in the “storage rotation area” from the “initial position” to the “intermediate position”. The moving tube storage guide section 40 has an optical axis between a “retracted position” where the moving tube 15 is retracted toward the imaging surface 10 a with respect to the fixed tube 16 and a “projection position” where the moving tube 15 is extended toward the subject. 20 is moved along. When the lens apparatus 2 is in the retracted position, the movable cylinder 15 is in the “retracted position”.

  The moving cylinder movement blocking portion 41 is a range in which the moving cylinder cam pin 25 slides when the rotating cylinder 17 rotates in the “magnifying rotation range” from the “intermediate position” to the “end position”. The moving cylinder movement blocking unit 41 is formed along the direction around the optical axis 20 so as to block the movement of the moving cylinder 15 in the optical axis direction while allowing the rotation of the moving cylinder 15 around the optical axis. ing. Thus, the movable cylinder 15 is maintained at the “projecting position” while the lens apparatus 2 is zoomed between the tele position and the wide position.

  Next, the configuration of the second lens rectilinear hole 23 will be described. A rectilinear hole engaging portion 54 of the second lens cam pin 29 provided on the outer peripheral surface of the second lens cylinder 14 is engaged with the second lens rectilinear hole 23. The second lens rectilinear hole 23 is formed along the optical axis 20, and the front end portion thereof communicates with the moving cylinder movement blocking portion 41 of the moving cylinder cam hole 24.

  By the way, the fixed cylinder 16 in which the second lens rectilinear hole 23 is formed is formed of an elastically deformable material such as plastic. When the second lens rectilinear advance hole 23 and the movable cylinder cam hole 24 are formed in communication with each other with respect to the fixed cylinder 16 formed of such an elastically deformable material, the second lens rectilinear advance hole 23 is It is formed to be expandable / contractible in the width direction.

  Then, with respect to the second lens rectilinear advance hole 23 formed so as to be expandable / contractible in the width direction in this way, the width A is set to the width B of the rectilinear hole engaging portion 54 of the second lens cam pin 29 (see FIG. 11). If formed slightly smaller, the second lens rectilinear hole 23 acts so as to sandwich the rectilinear hole engaging portion 54 of the second lens cam pin 29 engaged at both edges thereof from both sides. Thereby, there is no play between the rectilinear hole engaging portion 54 of the engaged second lens cam pin 29 and the rectilinear hole 23 for the second lens, and the second lens cylinder 14 can be guided linearly with high accuracy. It becomes like this.

  On the other hand, when the second lens rectilinear hole 23 is formed so as to communicate with the moving cylinder cam hole 24, the cam hole engaging portion 25A of the moving cylinder cam pin 25 engaged with the moving cylinder cam hole 24 is formed. There is a possibility that the second lens rectilinear advance hole 23 may be entered while sliding on the movable barrel movement preventing portion 41 or may be caught by the communicating portion.

  Therefore, the movable cylinder cam pin 25 is configured as follows, and is prevented from entering or being caught in the second lens rectilinear hole 23.

  FIGS. 9 and 10 are a plan view and a side view, respectively, showing the configuration of the movable cylinder cam pin 25. As shown in the figure, the movable cylinder cam pin 25 is composed of a cam hole engaging portion 25A, a guide groove engaging portion 25B, and a rectilinear groove engaging portion 25C.

  The cam hole engaging portion 25 </ b> A is formed in a columnar shape, and engages with the moving cylinder cam hole 24 provided in the fixed cylinder 16.

  The guide groove engaging portion 25B is integrally formed on the top of the cam hole engaging portion 25A and is formed in a trapezoidal plate shape. The guide groove engaging portion 25B engages with a guide groove 49 formed on the outer peripheral surface of the fixed cylinder 16. The guide groove 49 is formed along the edge of the movable cylinder cam hole 24. By engaging the guide groove engaging part 25B with the guide groove 49, the movable cylinder cam pin 25 is connected to the second lens. It is prevented that it enters into the straight advance hole 23 or is caught. That is, the guide groove engaging portion 25B is formed so that the width C in the direction around the optical axis is larger than the width A of the second lens rectilinear advance hole 23. Thus, the moving cylinder cam pin 25 is prevented from entering or catching on the second lens straight advance hole 23.

  Further, the guide groove engaging portion 25B is formed such that the width D in the optical axis direction is larger than the width E of the movable cylinder cam hole 24. This prevents the movable barrel cam pin 25 from coming out of the movable barrel cam hole 24.

  The rectilinear groove engaging portion 25C is integrally formed on the upper surface of the guide groove engaging portion 25B, and is formed in an elongated circular plate shape. The rectilinear groove engaging portion 25 </ b> C is engaged with the moving cylinder rectilinear groove 22 formed in the rotating cylinder 17. The effect of the straight groove engaging portion 25C being formed in an elongated circular shape will be described in detail later.

  FIG. 11 is a front view showing the configuration of the second lens cam pin 29 provided in the second lens cylinder 14. As shown in the figure, the second lens cam pin 29 is composed of a straight hole engaging portion 54 and a cam groove engaging portion 55.

  The rectilinear hole engaging portion 54 is formed in a cylindrical shape and engages with the second lens rectilinear hole 23 formed in the fixed cylinder 16.

  On the other hand, the cam groove engaging portion 55 is engaged with the second lens cam groove 21 formed on the inner peripheral surface of the rotary cylinder 17 and is configured by a storage engaging portion 55a and a magnification changing engaging portion 55b. Yes.

  The storage engagement portion 55a is integrally formed on the same axis as the top of the rectilinear hole engagement portion 54 and has a truncated cone shape. The storage engagement portion 55 a engages with the second lens storage guide portion 58 of the second lens cam groove 21. The bottom surface of the storage engagement portion 55a is formed to have a larger diameter than the outer diameter of the second lens rectilinear hole 23, and the rectilinear hole engagement portion 54 engages with the second lens rectilinear hole 23. , Abuts on the outer peripheral surface of the fixed cylinder 16. Accordingly, the second lens cam pin 29 is prevented from coming out of the second lens straight advance hole 23.

  On the other hand, the variable power engagement portion 55b is integrally formed on the top coaxial with the storage engagement portion 55a, and is formed in a truncated cone shape having a smaller diameter than the storage engagement portion 55a. The magnification changing engagement portion 55 b is engaged with the second lens magnification changing guide portion 56 and the second lens direction changing guide portion 57 of the second lens cam groove 21.

  FIG. 12 is a development view showing the configuration of the second lens cam groove 21 and the movable cylinder straight advance groove 22 formed on the inner peripheral surface of the rotary cylinder 17.

  First, the configuration of the second lens cam groove 21 will be described. The cam groove engaging portion 55 of the second lens cam pin 29 provided on the outer peripheral surface of the second lens cylinder 14 is engaged with the second lens cam groove 21. The second lens cam groove 21 includes a second lens magnification guide 56 (magnification region) for moving the second lens 12 along the optical axis 20 in order to change the focal length, and the second lens 12. The second lens direction changing guide portion 57 that changes the moving direction and the second lens storage guide portion 58 (storage region) that moves the second lens 12 to the “storage position C” are configured.

  The second lens zoom guide 56 is a second lens cylinder when the rotary cylinder 17 is rotated toward the “end position” in the “magnification rotation range” from the “intermediate position” to the “end position”. 14 is a curved cam locus that guides 14 so as to be retracted toward the image plane 10a.

  The second lens direction change guide 57 moves the second lens cylinder 14 when the rotary cylinder 17 is rotated toward the “intermediate position” in the rotation range from the “rotation position B” to the “intermediate position”. That is, the second lens cylinder 14 that has moved toward the subject side changes its direction and forms a curved locus that guides the direction to change and retract toward the image plane 10a. Yes.

  The second lens storage guide 58 is configured such that when the rotary cylinder 17 is rotated toward the “rotation position B” in the rotation range from the “initial position” to the “rotation position B”, the second lens cylinder 14 is It is a linear trajectory that guides it toward the subject side.

  Here, as described above, the magnification changing engagement portion 55b of the cam groove engaging portion 55 is engaged with the second lens changing guide portion 56 and the second lens direction changing guide portion 57, and the second lens. The storage engaging portion 55 a engages with the storage guide portion 58.

  For this reason, as shown in FIG. 13, the second lens variable magnification guide portion 56 has two tapered surfaces, a first tapered surface 56a and a second tapered surface 56b, on both side surfaces thereof. Only the portion 55b is formed so as to contact the second tapered surface 56b (both side surfaces of the storage engagement portion 55a do not contact the first tapered surface 56a).

  More specifically, the second tapered surface 56b of the second lens variable magnification guide portion 56 is formed with the same inclination angle as the both side surfaces of the variable magnification engagement portion 55b of the cam groove engagement portion 55. At the same time, the width F of the lower end portion is formed with the same width as the width G of the bottom portion of the magnification changing engagement portion 55b. On the other hand, the first taper surface 56a of the second lens variable magnification guide portion 56 is formed with the same inclination angle as the both side surfaces of the storage engagement portion 55a of the cam groove engagement portion 55, but its lower end portion. The width H is larger than the width I of the bottom of the storage engaging portion 55a. Therefore, in the second lens scaling guide 56, the cam groove engagement portion 55 is in contact with the second taper surface 56b only at the tip magnification change engagement portion 55b (the storage engagement portion 55a and the first taper surface). A predetermined gap is formed between 56a and 56a.

  The second lens direction change guide part 57 has the same configuration as the second lens magnification guide part 56. That is, the first taper surface and the second taper surface are formed on both side surfaces thereof, and the cam groove engaging portion 55 is only on the both sides of the second lens direction changing guide portion 57 at the tip magnification changing engagement portion 55b. Abuts against the surface (a predetermined gap is formed between the storage engagement portion 55a and both side surfaces of the second lens direction change guide portion 57 so that they do not contact each other).

  On the other hand, as shown in FIG. 14, the second lens storage guide portion 58 is tapered on both side surfaces 58a, and the cam groove engagement portion 55 has only both side surfaces of the storage engagement portion 55a. It is formed so as to abut on the surface 58a (it does not abut on both side surfaces 58a of the magnification changing engagement portion 55b). More specifically, both side surfaces 58a of the second lens storage guide portion 58 are formed with the same inclination angle as the both side surfaces of the storage engagement portions 55a of the cam groove engagement portion 55, and the openings thereof. The width J of the portion is formed with the same width as the width I of the bottom of the storage engagement portion 55a. Therefore, in the second lens storage guide portion 58, the cam groove engagement portion 55 is such that only the storage engagement portion 55a at the base end abuts on both side surfaces 58a of the second lens storage guide portion 58 (variable engagement). A predetermined gap is formed between the portion 55b and the both side surfaces 58a of the second lens storage guide portion 58 so that they do not contact each other.

  According to the second lens cam groove 21 configured as described above, when the rotary cylinder 17 is rotated from the “initial position” toward the “rotation position B”, the cam groove engaging portion of the second lens cam pin 29 is provided. 55 slides on the second lens storage guide portion 58 and feeds the second lens cylinder 14 toward the subject side. At this time, the cam groove engagement portion 55 slides with its storage engagement portion 55a abutting against both side surfaces 58a of the second lens storage guide portion 58 (the magnification change engagement portion 55b does not abut). .

  When the rotary cylinder 17 is rotated from the “rotation position B” toward the “intermediate position”, the cam groove engaging portion 55 of the second lens cam pin 29 slides on the second lens direction change guide portion 57. Thus, the moving direction of the second lens cylinder 14 is changed. That is, the second lens cylinder 14 is moved from the subject side toward the imaging plane 10a side. At this time, the cam groove engaging portion 55 slides with its variable magnification engaging portion 55b in contact with the second lens direction changing guide portion 57 (the storage engaging portion 55a does not contact).

  Further, when the rotary cylinder 17 is rotated from the “intermediate position” toward the “end position”, the cam groove engaging portion 55 of the second lens cam pin 29 slides on the second lens magnification guide portion 56. Then, the second lens cylinder 14 is moved in the retracting direction toward the image plane 10a. At this time, the cam groove engaging portion 55 slides with its magnification changing engagement portion 55b abutting against the second tapered surface 56b of the second lens magnification changing guide portion 56 (the storage engagement portion 55a does not abut). ).

  As described above, the cam groove engaging portion 55 of the second lens cam pin 29 has a two-stage structure, and the second lens cam groove 21 has a two-stage structure. The contact portion can be changed with the second lens storage guide portion 58, and as a result, the wear of the cam pin can be effectively suppressed.

  In addition, the second lens magnification guide unit 56 needs to operate the second lens cylinder 14 accurately at the time of shooting, and therefore requires high accuracy in the production thereof, whereas the second lens storage guide unit 58 is required. Since there is no influence on photographing, the accuracy as high as that of the second lens zoom guide 56 is not required. Therefore, by forming the cam groove engaging portion 55 and the second lens cam groove 21 as described above in a two-stage structure, it is only necessary to manufacture only the second lens magnification guide portion 56 with high accuracy (first step). The two-lens storage guide portion 58 may be manufactured in a rough manner), and productivity can be improved and the manufacturing cost can be reduced.

  Further, the movement locus of the cam groove engaging portion 55 in the second lens direction changing guide portion 57 is a curved shape convex toward the subject side. At this time, as shown in FIG. The radius of curvature Rb of the movement trajectory passing through the imaging plane side of the movement locus is the most imaged of the movement locus of the storage engagement portion 55a, as much as the diameter is smaller than that of the storage engagement portion 55a. It becomes larger than the curvature radius Ra of the movement locus passing through the surface side. As described above, in the second lens direction changing guide portion 57 that changes the moving direction of the second lens tube 14, the zooming engagement portion 55b having a large radius of curvature is engaged, so that the second lens tube 14 is moved smoothly. Can be made.

  Next, the configuration of the straight moving groove 22 for the moving cylinder will be described. The rectilinear groove engaging portion 25 </ b> C of the moving cylinder cam pin 25 is engaged with the moving cylinder rectilinear groove 22. As shown in FIG. 12, the moving cylinder straight advancing groove 22 is formed along the optical axis 20 and intersects with the second lens variable magnification guide portion 56 of the second lens cam groove 21.

  Here, as shown in FIG. 15, the moving barrel linear groove 22 is formed such that its depth K is shallower than the depth L of the second lens cam groove 21. As a result, the cam groove engaging portion 55 of the second lens cam pin 29 sliding on the second lens variable magnification guide portion 56 of the second lens cam groove 21 is prevented from entering the straight moving groove 22 for the moving cylinder. The

  On the other hand, as described above, the rectilinear groove engaging portion 25C of the moving cylinder cam pin 25 engaged with the moving cylinder rectilinear groove 22 is formed in an elongated circular plate shape. The length M of the rectilinear groove engaging portion 25C is formed to be longer than the length N of the intersecting portion between the moving cylinder rectilinear groove 22 and the second lens cam groove 21. This prevents the rectilinear groove engaging portion 25C of the moving cylinder cam pin 25 sliding in the moving cylinder rectilinear groove 22 from entering the second lens cam groove 21 or being caught by the intersecting portion.

  The operation of the lens apparatus 2 of the present embodiment configured as described above is as follows.

  First, the basic operation of the moving cylinder 15, the first lens cylinder 13, and the second lens cylinder 14 when the rotating cylinder 17 is rotated will be described.

  When the lens apparatus 2 is in the retracted position, as shown in FIG. 3, the movable cylinder 15 and the first lens cylinder 13 are housed inside the fixed cylinder 16, respectively.

  When the zoom motor 19 is driven and the rotating cylinder 17 is rotated from the “initial position” toward the “end position”, the rotation of the rotating cylinder 17 is transferred to the moving cylinder cam pin 25 via the moving cylinder linear advance groove 22. Communicated. As a result, the movable cylinder 15 rotates in conjunction with the rotating cylinder 17.

  Here, the movable cylinder 15 has a movable cylinder cam pin 25 provided on the outer peripheral portion thereof, and a movable cylinder straight groove 22 formed in the rotary cylinder 17 and a movable cylinder cam hole 24 formed in the fixed cylinder 16. Therefore, when it rotates, it moves in the optical axis direction while rotating with respect to the fixed cylinder 16.

  On the other hand, the first lens cylinder 13 has a first lens cam pin 28 provided on the outer peripheral portion thereof engaged with a first lens cam groove 26 formed on the movable cylinder 15 and has an inner peripheral surface thereof. Since the formed rectilinear guide groove 27 is engaged with the rectilinear guide protrusion 30 formed in the second lens cylinder 14, the movable cylinder 15 rotates along the optical axis 20 when the movable cylinder 15 rotates. Move straight ahead.

  The second lens cylinder 14 has a second lens cam pin 29 provided on the outer peripheral portion thereof, and is formed in the second lens cam groove 21 formed on the inner peripheral surface of the rotating cylinder 17 and the fixed cylinder 16. Since it is engaged with the second lens rectilinear hole 23, when the rotary cylinder 17 rotates, it moves linearly along the optical axis 20 in conjunction with this rotation.

  Next, movement trajectories of the first lens cylinder 13, the second lens cylinder 14, the moving cylinder 15 and the like when the rotating cylinder 17 is rotated will be described.

  FIG. 16 is an explanatory diagram showing movement trajectories of the first lens cylinder 13, the second lens cylinder 14, the moving cylinder 15, and the like.

  In the figure, a thick line (E) represents the movement locus of the first lens cylinder 13, and a thick line (F) represents the movement locus of the second lens cylinder 14. A thin line (G) represents the movement locus of the first lens cylinder 13 with respect to the moving cylinder 15, and a thin line (J) represents the movement locus of the movement cylinder 15.

  As shown in the figure, when the lens apparatus 2 is in the retracted position, the movable cylinder 15 is positioned at the “retracted position K”. Further, the second lens cylinder 14 is located at the “accommodation position C” closest to the image plane, and the first lens cylinder 13 is located at the “accommodation position D” close to the second lens cylinder 14. (The first lens cylinder 13 is positioned at the “retracted position H” with respect to the movable cylinder 15).

  First, the movement trajectory of the first lens cylinder 13 and the movable cylinder 15 when the rotating cylinder 17 rotates from the “initial position” to the “intermediate position” will be described.

  While the rotating cylinder 17 rotates from the “initial position” to the “rotating position A”, the first lens cam pin 28 provided on the outer peripheral portion of the first lens cylinder 13 is the first lens cam groove 26. 1 Lens storage preparation guide 42 is slid. Accordingly, the first lens cylinder 13 is extended from the “retraction position H” to the “storage preparation position I” in the movement locus represented by the thin line (G) with respect to the movement cylinder 15.

  While the rotary cylinder 17 rotates from the “rotation position A” to the “intermediate position”, the first lens cam pin 28 provided on the outer peripheral portion of the first lens cylinder 13 has the first lens cam groove 26. The first lens movement prevention unit 43 is slid. Thereby, the first lens cylinder 13 is prevented from moving in the optical axis direction with respect to the movable cylinder 15. Accordingly, since the first lens cylinder 13 does not move in the optical axis direction with respect to the moving cylinder 15 during this period, the first lens cylinder 13 moves to the “storage preparation position I” in the movement locus represented by the thin line (G) with respect to the moving cylinder 15. Maintained.

  On the other hand, while the movable cylinder 15 rotates from the “initial position” to the “intermediate position”, the movable cylinder cam pin 25 provided on the outer peripheral portion of the movable cylinder 15 is guided by the movable cylinder cam hole 24. Slide the part 40. Thereby, the movable cylinder 15 is extended from the “retracted position K” to the “projected position L” in the movement trajectory represented by the thin line (J).

  Here, the first lens cylinder 13 is supported by the movable cylinder 15. Therefore, while the rotary cylinder 17 rotates from the “initial position” to the “intermediate position”, the first lens cylinder 13 has the amount of extension of the movable cylinder 15 and the amount of extension of the first lens cylinder 13 with respect to the movable cylinder 15. It moves along the optical axis 20 by the added amount. In other words, when the rotating cylinder 17 rotates from the “initial position” to the “rotating position A”, the first lens cylinder 13 is extended from the “storage position D” to the “position M” in the movement locus indicated by the thick line (E). Then, when the rotary cylinder 17 rotates from “rotation position A” to “intermediate position”, it is extended from “position M” to “position O” in the movement locus shown by the thick line (E).

  Next, the movement locus of the second lens cylinder 14 when the rotary cylinder 17 rotates from the “initial position” to the “intermediate position” will be described.

  While the rotating cylinder 17 rotates from the “initial position” to the “rotating position B”, the second lens cam pin 29 provided on the outer peripheral portion of the second lens cylinder 14 is connected to the second lens cam groove 21. The two-lens storage guide 58 is slid. At this time, the second lens cam pin 29 slides with the storage engagement portion 55 a of the cam groove engagement portion 55 engaged with the second lens storage guide portion 58. As a result, the second lens cylinder 14 is extended from the “retraction position C” to the “position P” in the movement trajectory represented by the thick line (F).

  While the rotary cylinder 17 rotates from the “rotation position B” to the “intermediate position”, the second lens cam pin 29 provided on the outer peripheral portion of the second lens cylinder 14 has the second lens cam groove 21. The second lens direction change guide part 57 is slid. At this time, the second lens cam pin 29 is disengaged from the storage engaging portion 55 a of the cam groove engaging portion 55, and the magnification changing engaging portion 55 b is engaged with the second lens direction changing guide portion 57. Slide. Accordingly, the second lens cylinder 14 is extended from “position P” to “position N” in the movement locus represented by the thick line (F).

  Here, the magnification changing engagement portion 55 b that engages with the second lens direction changing guide portion 57 is formed to have a smaller diameter than the storage engagement portion 55 a that engages with the second lens storage guide portion 58. Therefore, the radius of curvature of the moving locus (the radius of curvature of the moving locus passing through the imaging plane side of the moving locus) is the radius of curvature of the moving locus of the storage engagement portion 55a (the imaging plane side of the moving locus being the most of the moving locus). It is larger than the radius of curvature of the moving trajectory. In this manner, the second lens cam pin 29 is slid by the zooming engaging portion 55b having a large curvature radius in the second lens direction changing guide portion 57 that changes the moving direction of the second lens cylinder 14. Therefore, the second lens cylinder 14 can be moved smoothly. This also reduces the rotational load on the rotating cylinder 17.

  As described above, when the rotary cylinder 17 rotates to the “intermediate position”, the lens device 2 is in the tele position as shown in FIG. In this state, the movable cylinder 15 is located at the “projection position L”. The first lens cylinder 13 is positioned at “position O”, and the second lens cylinder 14 is positioned at “position N”.

  After the lens apparatus 2 is in the tele position, the rotary cylinder 17 is rotated in the “magnification rotation range”.

  While the rotating cylinder 17 rotates in the “magnifying rotation range”, the moving cylinder cam pin 25 provided on the outer periphery of the moving cylinder 15 slides on the moving cylinder movement blocking portion 41 of the moving cylinder cam hole 24. To do. For this reason, the movable cylinder 15 is prevented from moving in the optical axis direction with respect to the fixed cylinder 16. Accordingly, since the moving cylinder 15 does not move in the optical axis direction during this period, the moving cylinder 15 is maintained at the “projection position L” in the movement locus represented by the thin line (J).

  The first lens cylinder 13 includes a first lens cylinder cam pin 28 provided on the outer periphery of the first lens cylinder groove 26 while the rotation cylinder 17 rotates in the “magnification rotation range”. The variable magnification guide 44 is slid. For this reason, the first lens barrel 13 moves along the optical axis 20 with respect to the movable barrel 15 by an amount corresponding to the displacement of the first lens magnification guide 44 in the optical axis direction.

  The second lens cylinder 14 includes a second lens cam pin 29 provided on the outer periphery of the second lens cam groove 21 while the rotating cylinder 17 rotates in the “magnification rotation range”. The variable magnification guide 56 is slid. For this reason, the second lens cylinder 14 is moved in accordance with the displacement of the second lens magnification guide 56 in the optical axis direction. At this time, the second lens cam pin 29 slides with the magnification changing engagement portion 55 b of the cam groove engaging portion 55 engaged with the second lens magnification changing guide portion 56.

  At the time of zooming, the first lens barrel 13 and the second lens barrel 14 are moved along the optical axis 20 so that their distances are different. During this time, the backlash of the second lens cam pin 29 and the second lens cam groove 21 is absorbed by the second lens cylinder 14 by the biasing of the spring 37 in the optical axis direction, and the inclination relative to the fixed cylinder 16 is also increased. It is corrected. On the other hand, in the first lens cylinder 13, the inside of the rectilinear guide groove 27 is pressed in the radial direction by the rectilinear guide protrusion 30. Tilting as much as possible.

  At this time, the urging in the radial direction by the straight guide protrusion 30 is one regardless of the movement position of the second lens cylinder 14. For this reason, the 1st lens cylinder 13 and the 2nd lens cylinder 14 can always be moved smoothly.

  Further, since the front end surface 30c of the rectilinear guide protrusion 30 is formed in a spherical shape, the rectilinear guide protrusion 30 contacts the bottom of the rectilinear guide groove 27 at a point. Thereby, the resistance at the time of sliding can be reduced as much as possible.

  The operation of the lens apparatus 2 of the present embodiment is as described above. By the way, in the lens device 2 of the present embodiment, the second lens cam groove 21 formed on the inner peripheral surface of the rotary cylinder 17 and the moving cylinder straight advance groove 22 are formed so as to intersect each other. In this way, by forming the second lens cam groove 21 and the movable cylinder straight groove 22 so as to intersect with each other, the inclination of the second lens cam groove 21 can be set gently. The two-lens cylinder 14 can be stably operated.

  That is, conventionally, since the second lens cam groove 21 and the moving cylinder straight groove 22 are formed so as not to cross each other, the inclination of the second lens cam groove 21 has to be set suddenly. As in the present embodiment, the second lens cam groove 21 and the movable cylinder straight groove 22 are formed so as to intersect each other, so that the second lens cam groove 21 regardless of the presence or absence of the movable cylinder straight groove 22. The inclination of 21 can be freely set. Thereby, the 2nd lens cylinder 14 can be operated stably. Further, the rotational load on the rotary cylinder 17 can also be reduced.

  In addition, since the inclination of the second lens cam groove 21 can be freely set as described above, the rotating cylinder 17 can be made as small as possible while ensuring stable operation of the second lens cylinder 14. You can also.

  On the other hand, when the second lens cam groove 21 and the moving cylinder straight groove 22 are formed to intersect each other as in the present embodiment, the second lens cam pin 29 that engages with the second lens cam groove 21 is formed. There is a possibility that the moving cylinder cam pin 25 entering the moving cylinder rectilinear groove 22 or engaging with the moving cylinder rectilinear groove 22 may enter the second lens cam groove 21. By forming the depth L to be deeper than the depth K of the moving cylinder rectilinear groove 22, it is possible to prevent the second lens cam pin 29 from entering the moving cylinder rectilinear groove 22. Further, the movement cylinder cam pin 25 is prevented from entering the second lens cam groove 21 because the linear movement groove engaging portion 25C of the movement cylinder cam pin 25 engaged with the movement cylinder linear movement groove 22 is formed into an elongated circle. This can be prevented by adopting a shape (a circular shape longer than the length N of the intersection).

  In the present embodiment, the second lens cam groove 21 and the movable barrel straight groove 22 are formed in three divided positions around the optical axis 20, respectively. When the cam groove 21, the moving cylinder linear advance groove 22, and the three-divided position around the optical axis 20 are formed, the three second lens cam pins 29 and the moving cylinder cam pins 25 are simultaneously formed into the second lens cam grooves. 21 passes through the intersection of the movable cylinder straight groove 22. In this case, each cam pin may be caught at the intersection of the second lens cam groove 21 and the movable cylinder straight groove 22, which may cause malfunction.

  Therefore, either one or both of the second lens cam groove 21 and the moving cylinder straight movement groove 22 are formed at unequal intervals around the optical axis, and each second lens cam pin 29 and each moving cylinder cam pin 25 are Shift the timing of passing the intersection. As a result, it is possible to effectively prevent the three cam pins from passing through the intersection at the same time and being caught at the intersection.

  For example, as shown in FIG. 17, the second lens cam grooves 21 are formed at equal intervals of 120 ° -120 ° -120 °, and the straight movement grooves 22 for the moving cylinder are unequal at 117 ° -117 ° -126 °. Form at intervals. By forming in this way, as shown in FIG. 18, the position of each intersecting portion is γ shifted in the optical axis direction, each second lens cam pin 29 and each movable barrel cam pin 25 passes through the intersecting portion. Can be shifted. Thereby, the 2nd lens cylinder 14 and the movement cylinder 15 can be moved smoothly, without producing a malfunctioning.

  In the above example, the straight moving grooves 22 for moving cylinders are formed at unequal intervals of 117 ° -117 ° -126 °, but the straight moving grooves 22 for moving cylinders are 120 ° -120 ° -120 °, etc. The same effect can be obtained by forming the second lens cam grooves 21 at unequal intervals of 117 ° -117 ° -126 °. Further, both may be formed at unequal intervals.

  Also, when forming at unequal intervals, it may be formed at 115 ° -115 ° -130 ° instead of 117 ° -117 ° -126 ° as in the above example. That is, it is sufficient that the cam pins have intervals that do not pass through the intersecting portions at the same time, and an optimum value is appropriately selected according to the diameter of the cylinder forming the groove, the width of the groove, and the like.

  Furthermore, forming the cam grooves at unequal intervals in this way can also be applied to the case where the cam grooves intersect with each other, and the same effect can be obtained. That is, the timing at which the cam pins engaged with the cam grooves pass through the intersection can be shifted, and malfunction can be effectively prevented.

  Further, in the above example, each second lens cam pin 29 and each movable barrel cam pin 29 and each movable barrel cam pin 29 are formed by shifting each second lens cam groove 21 or each movable barrel straight groove 22 in the direction around the optical axis. 25, the timing of passing through the intersection is shifted. However, the second lens cam pins 29 and the movable barrel cam pins 25 are formed by shifting the second lens cam grooves 21 in the optical axis direction. It is also possible to shift the timing of passing through the intersection.

  For example, as shown in FIG. 18, the second lens cam grooves 21 are formed so as to be shifted in the optical axis direction δ. Thereby, the position of each crossing part shifts in the optical axis direction, and the timing at which each second lens cam pin 29 and each movable cylinder cam pin 25 pass through the crossing part can be shifted.

  In addition, by shifting the cam groove in the optical axis direction in this way, shifting the timing at which the cam pin passes through the intersecting portion can be applied to the case where the cam grooves intersect with each other. Can be obtained.

  When the second lens cam grooves 21 are formed so as to be shifted in the optical axis direction, the length of the rotary cylinder 17 increases, but the second lens cam grooves 21 or the movable cylinder straight advance grooves 22 are light-transmitted. In the case where the lens device 2 is formed so as to be shifted in the direction around the axis, there is no such inconvenience, and the lens device 2 can be made compact.

  Further, in this embodiment, the straight moving groove 22 for the moving cylinder intersects with the second lens magnification guide portion 56 (magnification area) of the second lens cam groove 21, but the second lens storage guide You may make it cross | intersect in the part 58 (storage area | region). As described above, the second lens storage guide portion 58 intersects the moving cylinder straight groove 22 so that the photographing is not affected even if the cam pin is caught at the intersection. In addition, this makes it possible to smoothly operate the second lens cylinder 14 at the time of zooming operation.

  As described above, the movable cylinder rectilinear groove 22 and the second lens cam groove 21 can freely select the intersecting positions, and the cam grooves are formed to intersect the inner peripheral surface of the rotating cylinder 17. Compared to the case, the degree of freedom of design is improved.

  In other words, when the cam grooves intersect each other, the cam pins passing through the cam grooves are prevented from being guided to the other cam groove at the intersection, so that the cam grooves intersect at a certain angle. As a result, the degree of freedom in design is reduced. The cam groove intersection position thus selected does not necessarily coincide with the cam groove intersection position that is optimal for minimizing the diameter of the lens barrel, so that the cam groove can be secured while ensuring stable operation. There is a limit to miniaturizing the lens barrel by crossing each other.

  On the other hand, since the rectilinear groove is formed parallel to the optical axis, it can be freely designed without affecting the diameter of the cylindrical body at any position where it intersects the cam groove. As a result of being able to freely select the intersecting position in this way, the cam groove and the rectilinear groove can be intersected at the position where the intersecting angle becomes the largest, and as a result, the cylinder can be secured while ensuring stable operation. The diameter of the cylinder can be reduced as much as possible.

  Further, in the present embodiment, the rectilinear groove engaging portion 25C of the moving cylinder cam pin 25 that engages with the moving cylinder rectilinear groove 22 is formed in an elongated circular shape, but the shape of the rectilinear groove engaging portion 25C is However, the shape is not limited to this shape, and may be longer than the width at the intersection of the second lens cam groove 21.

  In addition, by forming the length of the cam pin that engages with one groove longer than the width at the intersection of the other groove, the cam pin that engages with one groove enters the other groove. Preventing this can also be applied when the cam grooves intersect each other. That is, when the cam grooves intersect each other, the length of the cam pin engaged with one cam groove is formed longer than the width at the intersection of the other cam groove. Thereby, the cam pin engaged with one cam groove can be prevented from entering the other cam groove. As a result, even when the crossing angle is small, the cam pin that engages with one cam groove can be prevented from entering the other cam groove, so that the size of the lens barrel can be reduced.

  Further, in the present embodiment, the second lens cam groove 21 and the movable barrel straight groove 22 are each described as an example in which the present invention is applied to a lens device in which three each are formed around the optical axis. The present invention can be similarly applied to any lens device in which two or more cam grooves and straight grooves are formed around the optical axis.

  In this embodiment, a zoom lens having a two-group configuration is used. However, the present invention is not limited to this, and a configuration having three or more groups may be used.

  In addition, the present invention can be applied not only to a zoom lens camera but also to a bifocal camera that switches to a tele position, a wide position, and a retracted position, for example, and is not limited to an electronic still camera. The present invention can also be applied.

The perspective view which shows the external appearance structure of an electronic still camera Exploded perspective view of the lens device Sectional view showing the lens device in the retracted position Sectional view showing the lens device in the tele position Sectional view showing the lens device in the wide position Sectional drawing which cut | disconnected the 1st lens cylinder and the 2nd lens cylinder in the direction orthogonal to an optical axis Development view showing the configuration of the first lens cam groove provided in the movable cylinder Development view showing configurations of movable cylinder cam hole and second lens rectilinear hole provided in fixed cylinder Plan view showing the configuration of the cam pin for the moving cylinder Side view showing configuration of cam pin for moving cylinder Front view showing the configuration of the second lens cam pin Development view showing configurations of second lens cam groove and movable cylinder straight groove formed on inner peripheral surface of rotary cylinder Sectional drawing which shows the engagement state of the cam groove for 2nd lenses, and the cam pin for 2nd lenses Sectional drawing which shows the engagement state of the cam groove for 2nd lenses, and the cam pin for 2nd lenses Sectional drawing which shows the structure of the cross | intersection part of the cam groove for 2nd lenses, and the straight advance groove | channel for movable cylinders Explanatory drawing which showed the movement locus | trajectories, such as a 1st lens cylinder, a 2nd lens cylinder, and a moving cylinder. Sectional drawing which shows the structure of other embodiment of the cam groove for 2nd lenses formed in the internal peripheral surface of a rotation cylinder, and the rectilinear advance groove | channel for movable cylinders Development view showing the configuration of another embodiment of the second lens cam groove and the moving cylinder straight groove formed on the inner peripheral surface of the rotating cylinder Development view showing the configuration of another embodiment of the second lens cam groove and the moving cylinder straight groove formed on the inner peripheral surface of the rotating cylinder

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic still camera, 2 ... Lens apparatus, 10a ... Imaging surface, 11 ... 1st lens, 12 ... 2nd lens, 13 ... 1st lens cylinder, 14 ... 2nd lens cylinder, 15 ... Moving cylinder, 16 ... Fixed cylinder, 17 ... Rotating cylinder, 20 ... Optical axis, 21 ... Second lens cam groove, 22 ... Moving cylinder rectilinear groove, 23 ... Second lens rectilinear hole, 24 ... Moving cylinder cam hole, 25 ... Move Cam pin for cylinder, 25A ... Cam hole engaging portion, 25B ... Guide groove engaging portion, 25C ... Straight groove engaging portion, 26 ... First lens cam groove, 27 ... Straight guide groove, 28 ... First lens cam pin , 29 ... second lens cam pin, 30 ... straight guide protrusion, 33 ... second lens frame, 34 ... focus motor, 37 ... spring, 38 ... arm, 40 ... moving cylinder storage guide section, 41 ... moving cylinder movement blocking section 42 ... 1st lens storage preparation guide part, 43 ... 1st lens movement Stop portion 44... First lens magnification guide portion 49. Guide groove 54. Straight hole engagement portion 55. Cam groove engagement portion 55 a. Storage engagement portion 55 b. 2nd lens zoom guide, 56a ... 1st taper surface, 56b ... 2nd taper surface, 58 ... 2nd lens storage guide part, 58a ... Both side surfaces of 2nd lens storage guide part

Claims (3)

In a lens device in which a cam groove having a zooming region for performing a zooming operation on the lens and a storage region for performing a storage operation, and a rectilinear groove are formed on the inner peripheral surface of the same cylinder,
The rectilinear groove is formed shallower than the cam groove, and the pin that engages with the cam groove passes through the intersection when the pin that engages with the cam groove slides in the storage area. As described above, the linear device and the cam groove are formed to intersect with each other. The pin that engages with the cam groove is formed of a storage engagement portion and a variable-magnification engagement portion that is formed coaxially with the top of the storage engagement portion and has a smaller diameter than the storage engagement portion.
The cam groove is formed to engage with a zooming engagement portion of the cam pin in the zooming region and to engage with a storage engagement portion of the cam pin in the storage region. 2. The lens device according to 1. 3. The lens device according to claim 1, wherein a length of a pin engaged with the rectilinear groove is formed longer than a width of the cam groove at the intersecting portion.

Images