JP2008158322A - Optical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide optical equipment that eliminates the need for special member for locking a movable member. <P>SOLUTION: The movable member 3 is disposed on a base 5 so as to be movable, in a direction perpendicular to an optical axis. A screw 7 parallel to the direction perpendicular to the optical axis is rotatably attached to the movable member 3. An operating member 12, perpendicular to the screw 7, is rotatably attached to the movable member 3. Bevel gears 11 and 13 for transmitting the rotation of the operating member 12 to the screw 7 are provided, and a drive force converting member 9 spirally engaged with the screw 7 is fixed to the base 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical apparatus capable of moving a lens barrel such as a PC (Perspective Control) lens in a direction crossing an optical axis.

  Conventionally, an electric lens shift mechanism of a projection display apparatus is known (see the following patent document).

  This lens shift mechanism includes a moving base and a fixed base.

  A fixed plate of the lens unit is fixed to the moving base.

  The fixed base holds the movable base so as to be movable in a direction orthogonal to the optical axis direction of the lens unit.

  The fixed base is provided with a motor for driving the moving base in a direction orthogonal to the optical axis.

In this lens shift mechanism, when the motor is stopped, the moving base also stops, and the moving base does not move even when the weight or external force of the lens unit is applied to the moving base.
JP 2003-315916 A (see paragraphs 0018-0023, FIG. 1)

  Thus, although the conventional lens shift mechanism is electric, for example, it is necessary to shift manually with a PC lens. For this reason, it is necessary to make the transmission mechanism from the manual operation knob to the moving base extremely smooth. As a result, when the weight or external force of the lens is applied to the moving base, the moving base moves. In order to prevent this, the conventional manual lens shift mechanism requires a mechanism for preventing the movement base from moving, and one knob for operating this mechanism is added. However, for example, there is a type of PC lens in which the moving base moves to the vicinity of the optical device main body. In this type, a knob for preventing the movement of the moving base is disturbed when the lens is shifted. Become.

  An object of the present invention is to provide an optical apparatus that does not require a dedicated mechanism for preventing movement of a movable member.

  In order to solve the above-described problem, an optical apparatus according to a first aspect of the invention includes a fixing member fixed to an optical apparatus body, a lens barrel, and an optical axis of the lens barrel with respect to the fixing member. A movable member movable in an intersecting direction, and a movable means having a regulating member that moves the movable member and regulates the movable member in the vertical direction are provided.

  According to a second aspect of the present invention, in the optical apparatus according to the first aspect, a transmission member that transmits a manual driving force to the movable member is provided.

  According to a third aspect of the present invention, in the optical apparatus according to the second aspect, the movable member has an input member for inputting power from the transmission member, and the transmission member is rotatably provided on the movable member. And a rotation transmission member that transmits the rotation of the shift operation shaft member to the input member.

  According to a fourth aspect of the present invention, in the optical device according to the third aspect, the input member is a first bevel gear, and the rotation transmission member is a second bevel gear that meshes with the first bevel gear. It is characterized by that.

  According to a fifth aspect of the present invention, in the optical apparatus according to the third aspect, the input member is a worm wheel, and the rotation transmission member is a worm gear meshing with the worm wheel.

  According to the present invention, it is an object of the present invention to provide an optical apparatus that does not require a dedicated mechanism for preventing movement of a movable member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of a lens shift mechanism of a PC lens according to the first embodiment of the present invention, and FIG. 2 is a perspective view of a movable member of the shift lens mechanism shown in FIG.

  As shown in FIGS. 1 and 2, the shift lens mechanism of the PC lens (optical device) includes a movable member 3, a base (fixed member) 5, a screw 7, a driving force converting portion (regulating member) 9, and a bevel gear (input). Member) 11, operation member (transmission member) 12, and bevel gear (rotation transmission member) 13.

  The movable member 3 has a plate portion 31, a frame portion 32, and a flange portion 33. A central hole 31 a is formed at the center of the plate portion 31. A guide hole 31b is formed in the vicinity of the center hole 31a. The guide hole 31b extends in a direction perpendicular to the optical axis.

  The frame portion 32 is formed on the peripheral edge portion of the plate portion 31. A first bearing portion 32 a is provided at the bottom of the frame portion 32, and a second bearing portion 32 b is formed on the side portion of the frame portion 32.

  The flange portion 33 is formed on the side opposite to the plate 31 side of the frame portion 32. A mounting hole 33 a is formed in the flange portion 33. A lens barrel (not shown) is fixed to the flange portion 33 by screws (not shown) inserted into the mounting holes 33a.

  Rails 34 are formed on the back surface of the plate portion 31. The rail 34 extends in a direction orthogonal to the optical axis direction. The cross-sectional shape of the rail 34 is a triangle.

  The base 5 has a plate portion 51 and an ant portion 52. A central hole 51 a is formed at the center of the plate portion 51. The center hole 51a faces the center hole 31a. A screw hole 51b is formed in the vicinity of the center hole 31a. The screw hole 51b faces the center of the guide hole 31b.

  The dovetail part 52 is formed on both sides of the plate part 51. The ant portion 52 extends in a direction orthogonal to the optical axis direction. The cross-sectional shape of the ant portion 52 is substantially triangular. The dovetail part 52 slidably holds the rail 34. Therefore, by inserting the rail 34 of the movable member 3 into the dovetail part 52 of the base 5, the movable member 3 can move on the base 5 in a direction perpendicular to the optical axis.

  A shaft portion 7 a is formed at the lower end portion of the screw 7. The shaft portion 7 a is inserted into the first bearing portion 32 a of the movable member 3.

  The driving force conversion member 9 has a screwing portion 91 and a coupling portion 92. The threaded portion 91 is formed with a female thread that is threadedly engaged with the screw 7. The coupling portion 92 is formed integrally with the screwing portion 91. The coupling portion 92 is passed through the guide hole 31b. The tip of the screw 15 that is screwed into the screw hole 51 b and protrudes from the screw hole 51 b is screwed into a female screw (not shown) formed in the coupling portion 92, and the coupling portion 92 is fixed on the base 5.

  The bevel gear 11 is fixed to the upper end of the screw 7.

  The operation member 12 includes a knob (shift operation shaft member) 12a, a large diameter portion 12b, and a small diameter portion 12c. The knob 12a is a portion that can be rotated by an operator's finger. The large diameter portion 12b is coupled to the knob 12a and is set to a thickness that cannot be inserted into a hole (not shown) formed in the second bearing portion 32b of the movable member 3. The small-diameter portion 12c is coupled to the large-diameter portion 12b and is inserted into the second bearing portion 32b, and the tip portion projects from the second bearing portion 32b.

  The bevel gear 13 is attached to the distal end portion of the small diameter portion 12 c of the operation member 12.

  Next, the operation of this embodiment will be described.

  When the knob 12a is rotated with a finger, the bevel gear 13 is rotated accordingly.

  When the bevel gear 13 rotates, the rotational force is transmitted to the screw 7 via the bevel gear 11 and the screw 7 rotates.

  The rotational force of the screw 7 becomes a thrust in a direction orthogonal to the optical axis direction of the screw 7 by the driving force conversion member 9, and the screw 7 rises or falls with the movable member 3 with respect to the base 5.

  When the rotation of the knob 12a is stopped, the rotation of the screw 7 is stopped and the movable member 3 is stopped at the same time.

  In this state, the movable member 3 is pulled downward by the weight of the lens barrel. For this reason, the movable member 3 pulls the driving force conversion member 9 downward through the screw 7, but the driving force conversion member 9 receives the screw 7. As a result, the movable member 3 does not move. The same applies to the external force transmitted to the driving force conversion member 9 via the screw 7.

  According to this embodiment, if the knob 12a is rotated with a finger, the movable member 3 can be moved in a direction orthogonal to the optical axis. If the finger is released from the knob 12a, the movable member 3 stops and the lens mirror is moved. It hardly moves due to the weight or external force of the tube.

  As described above, since there is no need for a dedicated operation member for fixing the movable member 3, there is only one operation member 12 even if the focal length of the lens is short and the movable member 3 is close to the optical device main body. So no problem.

  FIG. 3 is a perspective view of the movable member of the lens shift mechanism of the PC lens according to the second embodiment of the present invention.

  Portions common to the above-described first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the second embodiment, a worm wheel (input member) 211 is used instead of the bevel gear 11, and a worm gear (rotation transmission member) 213 is used instead of the bevel gear 13.

  Although the rotation of the worm gear 213 is transmitted to the worm wheel 211, the rotation of the worm wheel 211 is not transmitted to the worm gear 213, so that the movable member 3 can be stopped more reliably when the operation of the operation member 12 is stopped.

  The above-described embodiment is a lens shift mechanism for a PC lens. However, the present invention can be applied not only to a lens shift mechanism but also to a tilt mechanism for a PC lens, for example.

FIG. 1 is an exploded perspective view of a lens shift mechanism of a PC lens according to the first embodiment of the present invention. FIG. 2 is a perspective view of the movable member of the shift lens mechanism shown in FIG. FIG. 3 is a perspective view of the movable member of the lens shift mechanism of the PC lens according to the second embodiment of the present invention.

Explanation of symbols

  3: movable member, 5: base, 7: screw, 9: driving force converting member (regulating member), 11: bevel gear (input member), 211: worm wheel (input member), 12: operating member (transmitting member) 12a: Knob (shaft member for shift operation), 13: Bevel gear (rotation transmission member), 213: Worm gear (rotation transmission member).

Claims (5)

A fixing member fixed to the optical device body;
A movable member that holds the lens barrel and is movable relative to the fixed member in a direction intersecting the optical axis of the lens barrel;
An optical apparatus comprising: a movable unit that moves the movable member and has a regulating member that regulates the movable member in the vertical direction.   The optical apparatus according to claim 1, further comprising a transmission member that transmits a manual driving force to the movable member. The movable member has an input member for inputting power from the transmission member,
The transmission member includes a shift operation shaft member rotatably provided on the movable member, and a rotation transmission member that transmits the rotation of the shift operation shaft member to the input member. The optical apparatus according to claim 2.   The optical apparatus according to claim 3, wherein the input member is a first bevel gear, and the rotation transmission member is a second bevel gear that meshes with the first bevel gear.   4. The optical apparatus according to claim 3, wherein the input member is a worm wheel, and the rotation transmission member is a worm gear that meshes with the worm wheel.

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