JP2017203911A - Lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device that has a simple configuration and can easily switch scale display without requiring removal of a component.SOLUTION: In a lens device that moves the position of a lens group in an optical axis direction through a rotation operation of an operation ring, the operation ring includes: at least one slide member in which the position in substantially the optical axis direction is variable; rotation regulating means that regulates the rotation substantially on the optical axis of the slide member; and optical axis position regulating means that regulates the position in substantially the optical axis direction of the slide member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens apparatus, and more particularly, to a lens apparatus that operates an operating ring to move the position of a lens group in the optical axis direction.

  Conventionally, the scale display provided on the focus ring of the lens device includes a meter display and a foot display, and the lens used by the cameraman is properly used. In movie shooting, a tape or the like is attached to the focus ring to newly form an index corresponding to the shooting scene.

  In order to exchange the scale display of the lens device, in Patent Document 1, the first display scale ring is detachably attached to the surface of the focus ring body, and has a display form different from that of the first display scale ring. It can be exchanged with the second display scale ring.

  In Patent Document 2, a plain ring having no scale on the surface is prepared and can be replaced with a scale ring having a scale on the surface.

  In Patent Literature 3, display means (liquid crystal) that rotates together with the focus ring is provided on the outer periphery of the focus ring, and switching means for switching the scale unit displayed on the display means by the display control means is provided.

JP 2003-5008 A JP 2003-66304 A JP 2007-298672 A

  However, in the prior art disclosed in Patent Documents 1 and 2 described above, it is necessary to produce scale rings or plain rings that differ only in scale display according to the display form of each scale. In addition, one part must always be possessed in situations where replacement is expected.

  In the prior art disclosed in the above-mentioned Patent Document 3, it is necessary to energize the display means in the outer peripheral portion, and the structure of the lens device becomes complicated and expensive.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens device that can easily switch scale display without removing parts with a simple structure.

In order to achieve the above object, a lens apparatus according to the present invention includes:
In the lens device that rotates the operation ring to move the position of the lens group in the optical axis direction, the operation ring has at least one slide member whose position in the substantially optical axis direction is variable, and the substantially light of the slide member There is provided a rotation restricting means for restricting the rotation of the shaft center and an optical axis position restricting means for restricting the position of the slide member in the substantially optical axis direction.

  According to the present invention, it is possible to provide a lens device that has a simple structure and can easily switch the scale display without removing components. As a result, the scale display form of the focus ring can be changed without replacing the scale ring or the plain ring of the focus ring.

Sectional drawing of the lens apparatus of 1st Example Exploded view showing the rotation restricting means of the first embodiment. Sectional drawing which shows the optical-axis position control means of 1st Example Sectional drawing of the lens apparatus of 2nd Example Exploded view of the lens apparatus of the second embodiment Sectional drawing of the lens apparatus of 3rd Example Exploded view of the lens apparatus of the third embodiment Sectional drawing of the lens apparatus of 4th Example Exploded view of the lens apparatus of the fourth embodiment

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

[First embodiment]
FIG. 1 is a cross-sectional view of the periphery of the focus ring of the lens apparatus L1 according to the first embodiment of the present invention.

  In the lens device L1, a focus ring 21 is rotatably supported on the outer peripheral portion of the fixed cylinder 1. A slide ring 31 is supported on the outer periphery of the focus ring 21 so that the position in the optical axis direction can be changed. A foot scale 21 a is formed on the outer peripheral surface of the focus ring 21, and a metric scale 31 a is formed on the outer peripheral surface of the slide ring 31.

  The focus position of the lens is adjusted by rotating the focus ring 21 and moving the focus moving group F in the optical axis direction by aligning the desired scale (21a or 31a) with the index line 4a provided on the index ring 4. The desired object distance is set. The indicator ring 4 is fixed to the fixed cylinder 1 so as not to rotate.

  The focus ring 21 includes an operation ring main body 21 b and an operation ring cover portion 21 c, and the operation ring main body 21 b and the operation ring cover portion 21 c are integrated by a screw 5. A plunger 6 is formed on the outer periphery of the operation ring body 21b. A front side regulation groove 31 b and a rear side regulation groove 31 c are formed in the inner diameter portion of the slide ring 31. When the slide ring 31 is moved in the optical axis direction, a slide protrusion 31d provided on the outer peripheral surface of the slide ring 31 is used.

  As shown in FIG. 1A, in the state where the slide ring 31 is housed in the radial gap between the operation ring main body 21b and the operation ring cover portion 21c, the plunger 6 engages with the rear side regulation groove 31c to slide the ring. The position of the optical axis direction 31 is regulated. At this time, a foot scale 21a formed on the operating ring main body 21b is displayed on the outer peripheral surface of the lens device L1.

  On the other hand, as shown in FIG. 1B, in the state where the slide ring 31 is pulled out to the indicator ring 4 side, the plunger 6 engages with the front side regulation groove 31b to regulate the position of the slide ring 31 in the optical axis direction. . At this time, a metric scale 31a formed on the slide ring 31 is displayed on the outer peripheral surface of the lens device L1. That is, the scale display displayed on the outer peripheral surface of the lens device L1 can be switched depending on the position of the slide ring 31.

  As shown in FIG. 2, a rotation restricting protrusion 21d protruding in the radial direction is formed on the outer peripheral surface of the operation ring body 21b. A rotation restricting groove 31 e extending in the optical axis direction is formed in the inner diameter portion of the slide ring 31. The focus ring 21 and the slide ring 31 rotate together as a result of the rotation restricting protrusion 21d of the operation ring body 21b and the rotation restricting groove 31e of the slide ring 31 engaging with each other.

  FIG. 3 is a view of the rotation restricting protrusion 21d and the rotation restricting groove 31e as seen from the direction of the arrow A in FIG.

  The abutting surfaces 21e and 21f of the rotation restricting protrusion 21d and the abutting surfaces 31f and 31g of the rotation restricting groove 31e each have a tapered shape. When the slide ring 31 is moved to the indicator ring 4 side, the respective tapered portions come into contact with each other, so that rattling caused by the gap between the rotation restricting projection 21d and the rotation restricting groove 31e can be suppressed.

  According to the present embodiment, the focus scale display can be easily changed with a simple structure without removing the components.

[Second Embodiment]
A lens apparatus according to a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 4 is a cross-sectional view showing a state in which the slide ring 32 of the lens device L2 of the second embodiment is pulled out to the indicator ring 4 side. FIG. 5 is a part of a development view when the lens device L2 is viewed from the outside.

  In the second embodiment, a window portion 22 d extending substantially in the optical axis direction is formed in the operation ring cover portion 22 c of the focus ring 22. Further, a cutout 32b extending in the circumferential direction is formed on the outer peripheral surface of the slide ring 32. The notch 32b is arranged at a position where it can be seen from the outside of the lens device L2, regardless of the position of the slide ring 32. When changing the focus scale display of the lens device L2, the slide ring 32 is moved by putting a nail or a tool on the notch 32b.

  As shown in FIG. 5, even when the slide ring 32 is pulled out to the indicator ring 4 side, the meter scale 32a of the slide ring 32 and the index line 4a of the indicator ring 4 are adjacent to each other. Easy to align the index line. According to the second embodiment, since the scale and the index line can always be adjacent to each other, the ease of alignment of the scale and the index line is not changed by the focus scale display.

[Third embodiment]
A lens apparatus according to a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 6 is a cross-sectional view showing a state in which the slide ring 33 of the lens device L3 of the third embodiment is pulled out to the indicator ring 4 side. FIG. 7 is a part of a development view when the lens device L3 is viewed from the outside.

  In the third embodiment, a foot scale 23a is formed on the outer peripheral surface of the focus ring 23, and the outer peripheral surface of the slide ring 33 is a groundless surface 33a having no scale display. When the slide ring 33 is moved to the indicator ring 4 side, the foot scale 23a of the focus ring 23 is covered with the slide ring 33, so that there is no scale display on the outer peripheral surface of the lens device L3. By sticking the mark stickers 7a, 7b,... Corresponding to the shooting scene to the ground surface 33a of the slide ring 33, it is possible to quickly adjust to the desired shooting distance of the photographer.

  According to the third embodiment, it is possible to simplify the configuration of the focus ring and easily change the focus scale display. In movie shooting, when shooting with foot display and shooting at the mark sticker position are alternately performed, it is not necessary to remove the mark sticker or to attach it again.

[Fourth embodiment]
A lens apparatus according to a fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a cross-sectional view around the focus ring of the lens device L4 of the fourth embodiment. FIG. 9 is a part of a development view when the lens device L4 is viewed from the outside.

  In the fourth embodiment, a foot scale 24 a and a metric scale 24 b are formed on the outer peripheral surface of the focus ring 24. A rotation restricting protrusion 24 c protruding in the radial direction is formed on the outer peripheral surface of the focus ring 24. A rotation restricting groove 34 a extending in the optical axis direction is formed in the inner diameter portion of the slide ring 34.

  As shown in FIGS. 8A and 9A, when the slide ring 34 is located on the subject side, the foot scale 24a is displayed on the outer peripheral surface of the lens device L4. At this time, when the rotation restricting protrusion 24c of the focus ring 24 and the rotation restricting groove 34a of the slide ring 34 are engaged, the focus ring 24 and the slide ring 34 rotate together.

  On the other hand, as shown in FIGS. 8B and 9B, when the slide ring 34 is positioned on the indicator ring 44 side, a meter scale 24b is displayed on the outer peripheral surface of the lens device L4. At this time, the engagement between the rotation restricting protrusion 24c of the focus ring 24 and the rotation restricting groove 34a of the slide ring 34 is released. Further, the connection protrusion 34b of the slide ring 34 and the connection groove 44b of the index ring 44 are engaged, and the slide ring 34 and the index ring 44 are integrated so that the slide ring 34 cannot rotate. A second index line 34e is formed on the outer peripheral surface of the slide ring 34, and the in-focus position is adjusted by aligning the meter scale 24b with the second index line 34e.

  The abutting surfaces 34c and 34d of the connecting projection 34b of the slide ring 34 and the abutting surfaces 44c and 44d of the connecting groove 44b of the indicator ring 44 each have a tapered shape. When the slide ring 34 is moved to the indicator ring 44 side, the respective taper portions come into contact with each other, so that rattling of the slide ring 34 in the circumferential direction can be suppressed. According to the fourth embodiment, since the scale display can be integrated into one component, the cost can be reduced when the scale display is formed by printing.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary. For example, the same effect can be obtained by changing the scale display form formed on the outer peripheral surfaces of the focus ring and the slide ring, the arrangement and combination of the groundless surfaces. In addition, if the slide ring is divided into a plurality of parts and can be pulled out in multiple stages, a plurality of scale indications can be displayed on the lens outer peripheral surface at the same time.

  In this embodiment, the engagement method using the plunger is used as the optical axis direction regulating means of the slide ring. However, the present invention can be applied even when another engagement method such as a leaf spring and a groove is used. is there.

  According to each of the embodiments described above, it is possible to provide a lens device that has a simple structure and can easily switch the scale display without removing components.

L1, L2, L3, L4 lens device, F focus movement group,
21, 22, 23, 24 Operation ring, 31, 32, 33, 34 Slide member,
21d rotation restricting projection, 31e rotation restricting groove, 31b, 31c optical axis position restricting groove,
6 Plunger

Claims (6)

In the lens apparatus that rotates the operation ring to move the position of the lens group in the optical axis direction,
Having at least one slide member whose position in the optical axis direction is variable;
The operation ring includes rotation restriction means for restricting rotation of the slide member about the optical axis,
An optical axis position restricting means for restricting the position of the slide member in the optical axis direction is provided. The lens device according to claim 1, wherein the operation ring includes an operation ring main body that supports the slide member, and an operation ring cover portion that covers the slide member from an outer peripheral portion of the lens device. The lens apparatus according to claim 1, wherein the operation ring has a scale display on an outer peripheral surface, and the slide member has a scale display different from the operation ring on the outer peripheral surface. The lens apparatus according to claim 1, wherein at least one outer peripheral surface of the operation ring and the slide member is a groundless surface without a scale. The lens apparatus according to claim 1, wherein the operation ring has a plurality of different scale indications on an outer peripheral surface, and the slide member has an index line. 6. The rotation restricting means has a pair of rotation restricting grooves and rotation restricting protrusions, and the abutment surfaces of the rotation restricting grooves and the rotation restricting protrusions are tapered. The lens device according to any one of the above.