JP4953985B2 - Lens device - Google Patents

Description

  The present invention relates to a lens apparatus capable of focusing both manually and automatically.

  In a lens device that requires focusing, in the situation where there is no power source such as a power source, the operator must directly focus the lens device manually, and the lens device and the image display device are installed separately. Therefore, it is necessary to focus automatically by remote operation.

  For this reason, the lens device used under various conditions, such as when there is no power supply or when remote operation is required, requires a function that enables focusing either manually or automatically.

  2. Description of the Related Art Conventionally, there are lens apparatuses having a mechanism that performs focusing and zooming manually and automatically, as disclosed in Patent Document 1 and Patent Document 2, and as a lens apparatus that has a mechanism that performs focusing and zooming electrically. There exists what is shown by patent document 3. FIG.

  However, in these lens apparatuses, the drive mechanism is provided outside the lens barrel, and the lens apparatus is increased in size. In addition, there is a problem in that when the focusing is performed manually, the drive mechanism becomes an obstacle and obstructs workability.

JP 2000-89081 A

JP 2000-249895 A

Japanese Patent Laid-Open No. 2-285111

  In view of such a situation, the present invention incorporates a focusing drive mechanism in a lens barrel to reduce the size and improve the focusing workability.

  The present invention provides a fixed lens holder concentrically inside a lens barrel, and a focusing lens holder for holding a focusing lens in the fixed lens holder is slidably fitted in the axial direction and a focusing operation cylinder. The focusing lens holder is displaceable in the axial direction by rotation of the focusing operation tube via a pin erected on the focusing lens holder, and the lens barrel and the lens A focusing motor is provided between the fixed lens holder and a rotation transmission gear, and a rotation transmission gear is rotatably provided. The rotation transmission gear is engaged with the focusing operation tube, and a drive gear provided on the output shaft of the focusing motor is provided. Engage with the rotation transmission gear, and drive the focusing motor to rotate the focusing operation cylinder via the rotation transmission gear, so that the focusing lens can be displaced in the axial direction. Those of the lens apparatus.

  According to the present invention, a focusing operation ring is rotatably fitted on the lens barrel, and an inner peripheral surface of the focusing operation ring meshes with the rotation transmission gear, and the rotation transmission is performed by rotation of the focusing operation ring. The present invention relates to a lens apparatus configured to rotate the focusing operation tube via a gear so that the focusing lens can be displaced in the axial direction, and the rotation transmission gear is a driven gear meshing with the driving gear and the driven gear. It is constituted by an idle gear that can be joined to and separated from the focusing operation cylinder, and a clutch means is provided between the idle gear and the driven gear, and in the state where the idle gear and the driven gear are joined. The idler gear and the driven gear are integrated with each other and are related to a lens device that is rotatable in a separated state.

  Furthermore, in the present invention, the clutch means is provided on the idler gear so as to be slidable in the axial direction and is urged toward the driven gear, and is provided on the driven gear. An automatic / manual switching shaft having a radial axial center is rotatably provided in the lens barrel, and an inner end portion of the automatic / manual switching shaft is provided. The switching lever is fixed to the outer end portion of the automatic / manual switching shaft, the cam is rotated by rotation of the switching lever, and the idle gear is rotated with respect to the driven gear by rotation of the cam. The present invention relates to a lens device configured to be separated and joined so that the drive gear and the idle gear are disconnected.

  According to the present invention, the fixed lens holder is provided concentrically inside the lens barrel, and the focusing lens holder holding the focusing lens is fitted in the fixed lens holder so as to be slidable in the axial direction and focused. An operating tube is rotatably fitted, and the focusing lens holder is displaceable in the axial direction by rotation of the focusing operating tube via a pin standing on the focusing lens holder, and the lens barrel A focusing motor is provided between the lens and the fixed lens holder, and a rotation transmission gear is rotatably provided. The rotation transmission gear is engaged with the focusing operation cylinder, and a drive provided on the output shaft of the focusing motor. A gear is meshed with the rotation transmission gear, and the focusing operation cylinder is rotated via the rotation transmission gear by driving the focusing motor so that the focusing lens can be displaced in the axial direction. Since form was, focusing driving mechanism is built in the lens device is compact.

  According to the invention, the focusing operation ring is rotatably fitted on the lens barrel, the inner peripheral surface of the focusing operation ring is engaged with the rotation transmission gear, and the rotation of the focusing operation ring causes the rotation of the focusing operation ring. Since the focusing operation cylinder is rotated via a rotation transmission gear so that the focusing lens can be displaced in the axial direction, the focusing lens can be focused by a simple structure. Become.

  According to the invention, the rotation transmission gear includes a driven gear that meshes with the drive gear, and a floating gear that can be joined to and separated from the driven gear and meshed with the focusing operation cylinder. Clutch means is provided between the driven gears, and the idler gear and the driven gear are integrated in a state where the idler gear and the driven gear are joined, and are mutually rotatable in a separated state. The structure can transmit the driving force of the motor and release the connection with the motor.

  According to the present invention, the clutch means is provided on the idler gear so as to be slidable in the axial direction and is urged toward the driven gear, and the engagement pin is provided on the driven gear. Since the engaging gear can be fitted and removed, even if the rotational positions of the idle gear and the driven gear do not match, the idle gear and the driven gear are reliably integrated by the rotation of the driven gear. Is possible.

  Furthermore, according to the present invention, an automatic / manual switching shaft having a radial axial center is rotatably provided on the lens barrel, and a cam is fixed to an inner end portion of the automatic / manual switching shaft. A switching lever is fixed to the outer end portion of the manual switching shaft, and the cam is rotated by rotation of the switching lever, and the idle gear is joined to and separated from the driven gear by rotation of the cam, and the drive gear and the Since the idle gear is configured to be disengaged from the idle gear, it is possible to switch between manual focusing and automatic focusing with a simple configuration in which the drive mechanism is not exposed.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows a cross section of a lens apparatus according to the present invention, in which 10 is a lens barrel, and the lens barrel 10 is mainly composed of a main lens barrel 1 and a pedestal lens barrel 2.

  The objective lens 20 is held by the main lens barrel 1, and the pedestal lens barrel 2 is fixed to the focal side (right side in FIG. 1) of the main lens barrel 1. The tube 3 is externally fitted.

  Inside the main lens barrel 1, a variable power lens holder 4 and a correction lens holder 5 are provided slidably in the direction of the optical axis 6, respectively. The zoom lens holder 4 holds a zoom lens 7, and the correction lens holder 5 holds a correction lens 8.

  A variable magnification slide pin 9 is erected on the variable magnification lens holder 4 so as to penetrate the main lens barrel 1 and the zoom operation tube 3. A portion where the zoom slide pin 9 passes through the main lens barrel 1 is a slit hole 11 extending in parallel with the generatrix of the main lens barrel 1, and the zoom slide pin 9 passes through the zoom operation tube 3. The portion to be formed is an inclined slit hole 12 inclined with respect to the generatrix of the zoom operation cylinder 3.

  A correction slide pin 13 is erected on the correction lens holder 5 so as to penetrate the main lens barrel 1 and the zoom operation tube 3. The portion where the correction slide pin 13 passes through the main lens barrel 1 is a slit hole 14 extending in parallel with the generatrix of the main lens barrel 1, and the portion where the correction slide pin 13 passes through the zoom operation tube 3. Is an inclined slit hole 15 which is inclined with respect to the generatrix of the zoom operation cylinder 3. In addition, the inclined slit hole 15 and the inclined slit hole 12 are opposite in inclination direction.

  Thus, by rotating the zoom operation tube 3, the zoom lens holder 4 and the correction lens holder 5 come close to and away from each other, and the zoom lens 7 is moved to the optical axis via the zoom lens holder 4. The magnification is changed by moving in six directions, and the correction lens 8 is moved in the opposite direction via the correction lens holder 5 to correct the shift of the focal position.

  The zoom operation tube 3, the zoom lens holder 4, the correction lens holder 5, the zoom slide pin 9, the correction slide pin 13, and the like constitute a zoom mechanism.

  A fixed lens holder 17 is attached to the focal end of the main lens barrel 1 concentrically with the main lens barrel 1, and relay lenses 18 and 19 are held in the fixed lens holder 17. In addition, a focusing lens holder 21 is slidably fitted in an end of the fixed lens holder 17 on the focal side, and a focusing operation cylinder 22 is rotatably fitted. A focusing lens 23 is held on the focusing lens holder 21.

  A focusing slide pin 24 is erected on the focusing lens holder 21, and the focusing slide pin 24 passes through the fixed lens holder 17 and the focusing operation cylinder 22. A location where the focusing slide pin 24 penetrates the fixed lens holder 17 is a slit hole 25 extending in the generatrix direction of the fixed lens holder 17, and the focusing slide pin 24 penetrates the focusing operation tube 22. The portion to be formed is an inclined slit hole 26 inclined in the direction of the bus.

  Thus, when the focusing operation tube 22 rotates, the focusing lens 23 moves in the optical axis direction via the focusing lens holder 21. The focusing lens holder 21, the focusing operation tube 22, the focusing slide pin 24, the slit hole 25, the inclined slit hole 26, and the like constitute a focusing lens moving means.

  A focusing mechanism 28 is provided between the focusing operation cylinder 22 and the fixed lens holder 17.

  The focusing mechanism 28 will be described with reference to FIGS.

  FIG. 2 is an enlarged view of part A of FIG. FIG. 3 is a perspective view from the focal side, and FIG. 4 is a perspective view from the objective lens 20 side, and shows the pedestal barrel 2 and the focusing mechanism 28 attached to the pedestal barrel 2. Show. FIG. 5 is a perspective view of the focusing mechanism 28 from the focal side, and FIG. 6 is a perspective view of the focusing mechanism 28 from the objective lens 20 side.

  2 and 5 show the automatic focusing state.

  A block 31 is inserted and attached from the outer periphery of the pedestal barrel 2, and a support pin 32 is fixed to the block 31 in parallel with the optical axis 6.

  A cam follower flange 33 is slidably fitted to the support pin 32, an idle gear 34 is rotatably and slidably fitted to the support pin 32, and a driven gear 35 is rotatably fitted. The idle gear 34 is urged toward the block 31 (left side in FIG. 2) by an internal compression spring 36.

  The idle gear 34 meshes with a gear portion 22a engraved on the outer peripheral surface of the focusing operation tube 22, and can slide in the axial direction in the meshed state. At least one (two in the figure) clutch pin 37 is slidably provided in the axial direction in the idle gear 34, and the clutch pin 37 is urged toward the driven gear 35 by a clutch spring 38. The engaging pin 39 protrudes.

  The driven gear 35 is provided with a required number of engagement holes 41 on the same circumference, and the engagement pins 39 can be fitted into the engagement holes 41. In a state where the engagement pin 39 is fitted in the engagement hole 41, the driven gear 35 and the idle gear 34 rotate together, and the idle gear 34 and the idle gear 35 constitute a rotation transmission gear. Is done.

  The support pin 32 is rotatably provided with an automatic / manual switching shaft 42 having an axial center extending in the radial direction of the pedestal barrel 2, and a cam 43 is fixed to an inner end portion of the automatic / manual switching shaft 42. The cam 43 is in contact with the cam follower flange 33. Further, a switching lever 44 is fixed to the outer end portion of the automatic / manual switching shaft 42, and the cam 43 rotates by rotating the switching lever 44, and the cam follower flange 33 is rotated by the rotation of the cam 43. Displaces in the axial direction. The idle gear 34 is also displaced following the displacement of the cam follower flange 33 in the axial direction. When the cam follower flange 33 is on the focal side (right side in FIG. 1), the engagement pin 39 is fitted in the engagement hole 41, and when the cam follower flange 33 is on the objective lens 20 side, the engagement pin 39 is engaged. The mating pin 39 is removed from the engagement hole 41.

  Thus, the connection / release state of the idle gear 34 and the driven gear 35 can be selected according to the rotational position of the switching lever 44. The switching lever 44, the automatic / manual switching shaft 42, the cam 43, etc. constitute automatic / manual switching selecting means, and the idle gear 34, clutch pin 37, driven gear 35, and engagement pin 39. The engagement holes 41 and the like constitute clutch means.

  A focusing operation ring 45 is rotatably fitted on the pedestal barrel 2, and a gear portion 45 a is engraved on the inner periphery of the focusing operation ring 45. Further, a part of the pedestal barrel 2 is cut off, and the idle gear 34 is engaged with the gear portion 45a.

  A focusing motor 46 is mounted inside the pedestal barrel 2, and a drive gear 47 is fitted on the output shaft of the focusing motor 46, and the drive gear 47 is engaged with the driven gear 35. .

  Hereinafter, the operation for focusing will be described.

  First, the automatic focusing state will be described.

  The switching lever 44 is rotated to the automatic focusing position. At the automatic focusing position, the cam follower flange 33 is displaced in the focal direction by the cam 43, and the idle gear 34 is moved to the focal side against the compression spring 36. Further, the engagement pin 39 of the clutch pin 37 is fitted in the engagement hole 41, and the driven gear 35 and the idle gear 34 are in a state of rotating integrally.

  When the drive gear 47 is rotated by the focusing motor 46, the driven gear 35 is rotated, and the idle gear 34 is rotated integrally with the driven gear 35. The floating gear 34 rotates the focusing operation tube 22 via the gear portion 22a, and moves the focusing lens holder 21 via the focusing slide pin 24, the slit hole 25, and the inclined slit hole 26. It is displaced in the direction of the optical axis, and focusing is performed. The focusing is confirmed by an image of a display device provided separately.

  Next, when performing manual focusing, the switching lever 44 is rotated to the manual focusing position.

  The cam 43 rotates to move the cam follower flange 33 toward the objective lens 20, and the idle gear 34 also moves toward the objective lens 20 due to the urging force of the compression spring 36. The engagement pin 39 is removed from the engagement hole 41, the idle gear 34 and the driven gear 35 can be freely rotated with each other, and the idle gear 34 and the focusing motor 46 are separated.

  When the focusing operation ring 45 is manually rotated, the rotational force is transmitted to the focusing operation cylinder 22 via the idle gear 34, and the focusing operation cylinder 22 rotates. Therefore, manual focusing is possible.

  Next, when the switching lever 44 is rotated to automatically switch again, the idle gear 34 is moved to the driven gear 35 side, but depending on the position of the engagement hole 41, the engagement pin 39 may be moved. The engagement hole 41 may not be fitted. In this state, the clutch spring 38 is bent and the engagement pin 39 is retracted. When the driven gear 35 is rotated by the focusing motor 46 via the drive gear 47, the engagement hole 41 and the engagement pin 39 are eventually aligned, and the two are fitted to each other and the focusing is performed. Focusing by the motor 46 is possible.

It is sectional drawing which shows embodiment of this invention. FIG. 2 is a cross-sectional view of a part A of FIG. It is a perspective view from the focal side which shows the principal part of embodiment of this invention. It is a perspective view from the objective lens side which shows the principal part of embodiment of this invention. It is a perspective view from the focal side of the focusing mechanism in embodiment of this invention. It is a perspective view from the objective lens side of the focusing mechanism in the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main lens barrel 2 Base lens barrel 3 Zoom operation cylinder 7 Variable magnification lens 18 Relay lens 19 Relay lens 21 Focusing lens holder 22 Focusing operation cylinder 23 Focusing lens 24 Focusing slide pin 25 Slit hole 26 Inclined slit hole 28 Focusing mechanism 32 Support pin 33 Cam follower flange 34 Free gear 35 Driven gear 37 Clutch pin 39 Engagement pin 41 Engagement hole 43 Cam 44 Switching lever 45 Focusing operation ring 46 Focusing motor 47 Drive gear

Claims (3)

A focusing operation ring is rotatably fitted on the lens barrel, a fixed lens holder is provided concentrically inside the lens barrel, and a focusing lens holder for holding the focusing lens on the fixed lens holder is arranged in the axial direction. The focusing lens holder is pivotally fitted and slidably fitted, and the focusing operation cylinder is rotatably fitted, and the focusing lens holder is rotated by a rotation of the focusing operation cylinder via a pin standing on the focusing lens holder. Displaceable in the center direction, and a focusing motor is provided between the lens barrel and the fixed lens holder ,
Provided the gears rotatably a rotatable provided Rutotomoni the free movement gear and the driven gear coaxially, a drive gear provided on the output shaft of the front Symbol focusing motor is meshed with the driven gear, the said idler gear Mesh with the inner peripheral surface of the focusing operation ring and mesh with the focusing operation cylinder;
The driven gear and the free gear can be joined and separated, and a clutch means is provided between the free gear and the driven gear, and the free gear and the driven gear are in a state where the free gear and the driven gear are joined. And is configured to be mutually rotatable in a separated state,
In a state where the idle gear and the driven gear are separated from each other, the focusing operation tube is rotated via the idle gear by rotation of the focusing operation ring, and the focusing lens can be displaced in the axial direction.
In the state where the idle gear and the driven gear are integrated, the focusing operation cylinder is rotated via the driven gear and the idle gear by driving the focusing motor, and the focusing lens is moved in the axial direction. A lens device configured to be displaceable. The clutch means is provided on the idler gear so as to be slidable in the axial direction and is urged toward the follower gear, and an engagement pin provided on the follower gear and detachable from the engage pin. lens system of claim 1, and a hole. An automatic / manual switching shaft having a radial axial center is rotatably provided on the lens barrel, and a cam is fixed to an inner end portion of the automatic / manual switching shaft, and is attached to an outer end portion of the automatic / manual switching shaft. The switching lever is fixed, the cam is rotated by the rotation of the switching lever, the idle gear is joined to and separated from the driven gear by the rotation of the cam, and the drive gear and the idle gear are disconnected. The lens apparatus according to claim 1 or 2 , wherein the lens apparatus is configured as described above.

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