JP2010243842A - Lens device and method for manufacturing the lens device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens device which is easily worked to facilitate adjusting work, and is excellent in reproducibility in alignment of an optical axis of a lens barrel with a center axis of a mount member when it is reassembled after the lens barrel and the mount member are detached because of maintenance care or the like, and also to provide a manufacturing method of the lens device. <P>SOLUTION: The lens device has: a lens barrel; a mount member which is attached to the lens barrel and is a connection part with other components; a gap for adjustment which is formed to align the optical axis of the lens barrel with the center axis of the mount member; and an adhesive with which the gap for adjustment is filled, and which is solidified in the state where the alignment has been performed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens device and a method for manufacturing the lens device, and more particularly, to a lens device such as an ENG lens that is replaceably attached to an ENG camera for television broadcasting, and a method for manufacturing the lens device.

  When a lens device is manufactured by attaching a mount member to be connected to other parts such as the camera body to the lens barrel, it is mounted on the lens barrel while adjusting the optical axis of the lens barrel and the central axis of the mount member. It is necessary to attach a member.

  Here, in Patent Document 1, the position of the lens frame is adjusted in a direction orthogonal to the optical axis with respect to the mount frame, thereby correcting the deviation between the optical axis of the lens and the camera-side light receiving surface that occurs during shooting. A mount shift device that can be used is disclosed. However, there is no mention of a method of adjusting the optical axis of the lens barrel and the central axis of the mount member when manufacturing the lens device.

  Conventionally, when adjusting the optical axis of the lens barrel and the central axis of the mount member, as shown in FIG. 6A, a pin into which the eccentric pin 110 and the fixing pin 112 can be inserted into the lens barrel (not shown). A hole (not shown) and an adjustment hole 114 and an adjustment hole 116 into which the eccentric pin 110 and the fixing pin 112 can be respectively inserted are provided in the mount 100. Then, the optical axis of the lens barrel and the center axis of the mount 100 are aligned while moving the mount 100 to change the position of the eccentric pin 110 in the adjustment hole 114, and the lens barrel and the mount 100 are fixed by the fixing pin 112. The method of fixing was taken.

  Further, as shown in FIG. 6B, after aligning the optical axis of the lens barrel (not shown) and the central axis of the mount 100, holes (not shown) are simultaneously processed in the lens barrel and the mount 100. A method of driving the pin 118 was taken.

Japanese Patent Laid-Open No. 10-115757

  However, in the prior art, the pin hole of the lens barrel and the adjustment hole of the mount member are complicated in shape and require high processing accuracy. In addition, when a pin is driven by simultaneously processing holes in the lens barrel and the mount member, it is difficult to manage the processing accuracy of the pin driving position. In addition, in the conventional techniques, the work becomes complicated and it takes time to assemble. In addition, in the prior art, when the lens barrel and the mount member are removed for maintenance or the like, it is necessary to readjust the optical axis of the lens barrel and the center axis of the mount member. Can no longer be removed.

  The present invention has been made in view of such circumstances, and processing is easy and adjustment work is facilitated.When the lens barrel and the mount member are removed for maintenance and the like, the optical axis of the lens barrel is reassembled. It is an object of the present invention to provide a lens device excellent in reproducibility of alignment of the central axis of the mount member and a method for manufacturing the lens device.

  In order to achieve the above object, a lens apparatus according to the present invention includes a lens barrel, a mount member that is attached to the lens barrel and is a connecting portion with other components, an optical axis of the lens barrel, and the mount member. An adjustment gap for aligning the central axis, and an adhesive that is filled in the adjustment gap and solidified in the state of alignment.

  According to the present invention, the processing is easy and the adjustment work is facilitated, and the optical axis of the lens barrel and the central axis of the mount member are aligned when the lens barrel and the mount member are reassembled after being removed for maintenance or the like. Excellent reproducibility.

  As one aspect of the present invention, the lens barrel or the mount member includes a pin hole, and the other includes an adjustment hole having a hole diameter larger than an outer diameter of a pin attached to the pin hole, and the adjustment gap Is a gap between the pin and the adjustment hole generated when the pin attached to the pin hole is inserted into the adjustment hole.

  According to this aspect, since a high degree of processing accuracy is not required for the adjustment hole, processing is easy and adjustment work is facilitated.

  As one aspect of the present invention, the mount member includes a lens barrel fitting portion that is a fitting portion with the lens barrel and has an outer diameter smaller than the inner diameter of the inner peripheral surface of the lens barrel, and the adjustment The use gap is a gap between the lens barrel fitting portion and the inner peripheral surface of the lens barrel generated when the lens barrel and the mount member are fitted.

  According to this aspect, since high processing accuracy is not required for the inner peripheral surface of the lens barrel and the lens barrel fitting portion of the mount member, the processing is easy and the adjustment work is facilitated.

  In order to achieve the above object, a method for manufacturing a lens apparatus according to the present invention aligns the optical axis of a lens barrel with the central axis of a mount member attached to the lens barrel and serving as a connection portion with other components. An adhesive while maintaining the alignment state performed in the alignment step with respect to an adjustment gap for performing the alignment, and a step of attaching the mount member to the end surface of the lens barrel And solidifying by filling.

  As one aspect of the present invention, the lens barrel or the mount member includes a pin hole, and the other includes an adjustment hole having a hole diameter larger than an outer diameter of a pin attached to the pin hole, and the adjustment gap Is a gap between the pin and the adjustment hole generated when the pin attached to the pin hole is inserted into the adjustment hole.

  As one aspect of the present invention, the mount member includes a lens barrel fitting portion that is a fitting portion with the lens barrel and has an outer diameter smaller than the inner diameter of the inner peripheral surface of the lens barrel, and the adjustment The use gap is a gap between the lens barrel fitting portion and the inner peripheral surface of the lens barrel generated when the lens barrel and the mount member are fitted.

  According to the present invention, processing is easy and adjustment work is facilitated, and the optical axis of the lens barrel and the central axis of the mount member are readjusted when the lens barrel and the mount member are reassembled after being removed for maintenance or the like. Excellent reproducibility.

It is the side view and rear-end perspective view of the lens apparatus of this invention. It is the figure which shows the method of attaching a mount to the rear end of a lens-barrel, and manufacturing a lens apparatus, and the front view of a mount. It is AA sectional drawing of Fig.1 (a). It is a side view of the rear-end part of a lens apparatus. It is a figure which shows another Example. It is a figure which shows a prior art.

  Preferred embodiments of a lens apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. 1A is a plan view showing an appearance of a lens apparatus according to the present invention, and FIG. 1B is a perspective view of a rear end thereof. As shown in FIG. 1A, the lens device 1 is an ENG lens that is replaceably attached to an ENG camera for television broadcasting or the like, and is an inner focus type zoom lens.

  The lens device 1 is mainly composed of a lens barrel 10, optical components inside the lens barrel 10, and a mount 20 provided at the rear end portion of the lens barrel 10. The lens device 1 is detachably attached to a camera body (not shown) by a mount 20.

  The internal structure of the lens barrel 10 is not shown, but as is well known, a fixed focus lens, a movable focus lens (group), a zoom lens (group), an iris, and a relay lens (group) in order from the front. Etc. are arranged.

  The mount 20 includes a lens barrel side end surface 22 that is an end surface on the side where the lens barrel 10 is attached, a bayonet claw portion 24, a camera fitting portion 26 that is fitted to a camera body (not shown), and the like.

  As shown in FIG. 1B, the mount 20 is mounted at the rear end of the lens barrel 10 with the optical axis of the lens barrel 10 and the center axis of the mount 20 aligned, as will be described in detail later. Screwed.

  2A is a view showing a method of manufacturing the lens device 1 by attaching the mount 20 to the rear end of the lens barrel 10, and FIG. 2B is a front view of the mount 20. FIG.

  As shown in FIG. 2A, the rear end surface 12 of the lens barrel 10 is provided with six screw holes 14 and two pin holes 16. As shown in FIG. 2, the two pin holes 16 are desirably arranged at positions that are axially symmetric with respect to the central axis of the lens barrel 10, but are not particularly limited to these positions. Further, the number of pin holes 16 is not limited to two but may be three or more.

  Further, as shown in FIGS. 2A and 2B, six screw holes 28 and two adjustment holes 30 are provided on the lens barrel side end surface 22 of the mount 20. The diameter of the adjustment hole 30 is larger than the outer diameter of the pin 40 to be inserted. As shown in FIG. 2B, it is desirable that the two adjustment holes 30 be arranged at positions that are axially symmetric with respect to the central axis of the mount 20, but the present invention is not limited to this position. Further, the number of adjustment holes 30 is not limited to two and may be three or more. Further, the shape of the adjustment hole 30 is not limited to a circle, but may be other shapes such as an ellipse.

  Therefore, when the lens device 1 is manufactured by attaching the mount 20 to the rear end of the lens barrel 10, first, the pins 40 are inserted into the pin holes 16 of the lens barrel 10.

  Next, the lens barrel side end surface 22 of the mount 20 is aligned with the rear end surface 12 of the lens barrel 10, and the pin 40 is inserted into the adjustment hole 30 of the mount 20.

  Next, the screw 42 is temporarily fixed to the screw hole 14 of the lens barrel 10 through the screw hole 28 of the mount 20.

  Next, alignment is performed so that the optical axis of the lens barrel 10 and the central axis of the mount 20 coincide. In the present embodiment, since the diameter of the adjustment hole 30 of the mount 20 is larger than the outer diameter of the pin 40, an adjustment gap is generated between the adjustment hole 30 and the pin 40, and the pin 40 moves in the adjustment hole 30. be able to. Therefore, the relative position of the lens barrel 10 and the mount 20 can be adjusted in the direction perpendicular to the optical axis of the lens barrel 10.

  Next, by fixing the screw 42, the mount 20 is mounted on the rear end surface 12 of the lens barrel 10 in a state where the optical axis of the lens barrel 10 and the center axis of the mount 20 are aligned. Fix it.

  Next, as shown in FIG. 3, the adjustment gap formed between the adjustment hole 30 of the mount 20 and the pin 40 is filled with an adhesive 44 and solidified to adhere the pin 40 to the mount 20. Thereby, the pin 40 is integrated with the mount 20. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  In addition, about the part which may contact the adhesive agent 44 in the rear-end surface 12 of the lens-barrel 10, it is good to apply | coat fluorine-type grease or to make the material of the said part into a polyacetal. As a result, the adhesive 44 does not adhere to the lens barrel 10 reliably, and the adhesive 44 adheres only to the mount 20 and the pins 40 and solidifies.

  As described above, the mount 20 can be attached to the rear end of the lens barrel 10 in a state where the optical axis of the lens barrel 10 and the central axis of the mount 20 coincide with each other.

  As a result, as shown in FIG. 4, even when the mount 20 is removed from the lens barrel 10 and attached again, only the pin 40 integrated with the mount 20 is inserted into the pin hole 16 of the lens barrel 10. Thus, the optical axis of the lens barrel 10 and the central axis of the mount 20 coincide. Therefore, even when the mount 20 is removed from the lens barrel 10 for maintenance or the like and then attached again, it is not necessary to align the lens barrel 10 and the mount 20. Therefore, it is easy to attach the lens barrel 10 to the mount 20.

  Further, the shape of the adjustment hole 30 of the mount 20 is not particularly limited, and may be a simple shape (such as a circle or an ellipse), and high processing accuracy is not required, so that processing is easy.

  As a modification, an adjustment hole (not shown) may be provided on the rear end surface 12 of the lens barrel 10 and a pin hole (not shown) may be provided on the mount 20. In the case of this modification, the pin 40 is integrated with the lens barrel 10.

  In addition, the embodiment of FIG. 5 is also conceivable. In this embodiment, as shown in FIG. 5 (a), the mount 20 is provided with a lens barrel fitting portion 46 having an outer diameter that is one step smaller than the other portions. Is formed smaller than the inner diameter of the inner peripheral surface 10 a of the lens barrel 10.

  Therefore, first, the lens barrel fitting portion 46 of the mount 20 is fitted to the lens barrel 10.

  Next, alignment is performed so that the optical axis of the lens barrel 10 and the central axis of the mount 20 coincide. In this embodiment, the outer diameter of the lens barrel fitting portion 46 is formed smaller than the diameter of the inner peripheral surface 10a of the lens barrel 10, so that the inner peripheral surface 10a of the lens barrel 10 and the lens barrel of the mount 20 are arranged. An adjustment gap is generated between the fitting portions 46. Therefore, the relative position of the lens barrel 10 and the mount 20 can be adjusted in the direction perpendicular to the optical axis of the lens barrel 10.

  Next, with the alignment state maintained, as shown in FIG. 5A, the adjustment gap is filled with the adhesive 48 and solidified. It is desirable to provide a filling path for filling the adjustment gap with the adhesive 48 in at least one of the lens barrel 10 and the mount 20.

  Here, a fluorine grease is applied to a portion of the inner peripheral surface 10a of the lens barrel 10 that contacts the adhesive 48, or the material of the portion is made of polyacetal. As a result, the adhesive 48 does not adhere to the lens barrel 10, and the adhesive 48 adheres only to the mount 20 and solidifies.

  As described above, as shown in FIG. 5B, even when the mount 20 is detached from the lens barrel 10 and attached again, only the lens barrel fitting portion 46 of the mount 20 is fitted to the lens barrel 10. Thus, the optical axis of the lens barrel 10 and the central axis of the mount 20 coincide. Therefore, even when the mount 20 is removed from the lens barrel 10 for maintenance or the like, it is not necessary to perform alignment so that the optical axis of the lens barrel 10 and the center axis of the mount 20 coincide. Therefore, it is easy to attach the lens barrel 10 to the mount 20.

  Further, the shape and diameter of the outer periphery of the lens barrel fitting portion 46 of the mount 20 are not particularly limited, and high processing accuracy is not required, so that processing is easy.

  As described above, the lens apparatus 1 according to the present invention includes the adjustment gap for aligning the optical axis of the lens barrel 10 and the center axis of the mount 20, and the adjustment gap filled with the position. Since the adhesive 44 or the adhesive 48 solidified in a state where the alignment is performed, the processing is easy and the adjustment work is facilitated. When the lens barrel 10 and the mount 20 are removed for maintenance, etc. In addition, the reproducibility of the alignment between the optical axis of the lens barrel 10 and the central axis of the mount 20 is excellent.

  The manufacturing method of the lens apparatus 1 according to the present invention includes an alignment process for aligning the optical axis of the lens barrel 10 and the central axis of the mount 20, and an attachment process for attaching the mount 20 to the rear end surface 12 of the lens barrel 10. And an adhesive filling step of filling and solidifying the adhesive 44 or 48 while maintaining the alignment state performed in the alignment step with respect to the adjustment gap. Adjustment is facilitated, and the reproducibility of the alignment of the optical axis of the lens barrel 10 and the central axis of the mount 20 is improved when the lens barrel 10 and the mount 20 are removed and reassembled for maintenance.

  The lens device and the method for manufacturing the lens device of the present invention have been described in detail above. However, the present invention is not limited to the above examples, and various improvements and modifications can be made without departing from the gist of the present invention. Of course.

  DESCRIPTION OF SYMBOLS 1 ... Lens apparatus, 10 ... Lens barrel, 12 ... Rear end surface, 14 ... Screw hole, 16 ... Pin hole, 20 ... Mount, 22 ... End side surface of lens barrel, 28 ... Screw hole, 30 ... Adjustment hole, 40 ... Pin 42 ... Screws, 44, 48 ... Adhesive, 46 ... Lens barrel fitting part

Claims (6)

A lens barrel;
A mounting member that is attached to the lens barrel and is a connecting part with other components;
An adjustment gap for aligning the optical axis of the lens barrel and the central axis of the mount member;
An adhesive that is filled in the adjustment gap and solidified in a state in which the alignment is performed;
A lens apparatus comprising: The lens barrel or the mount member is provided with a pin hole, and the other is provided with an adjustment hole having a hole diameter larger than the outer diameter of the pin attached to the pin hole,
The adjustment gap is a gap between the pin and the adjustment hole generated when the pin attached to the pin hole is inserted into the adjustment hole;
The lens apparatus according to claim 1. The mount member includes a lens barrel fitting portion that is a fitting portion with the lens barrel and has an outer diameter smaller than the inner diameter of the inner peripheral surface of the lens barrel,
The adjustment gap is a gap between the lens barrel fitting portion and an inner peripheral surface of the lens barrel that are generated when the lens barrel and the mount member are fitted.
The lens apparatus according to claim 1. A step of aligning the optical axis of the lens barrel with the central axis of the mount member that is attached to the lens barrel and serves as a connection portion with other components;
Attaching the mount member to the end surface of the lens barrel;
Filling and solidifying the adhesive while maintaining the alignment state performed in the alignment step with respect to the adjustment gap for performing the alignment; and
A method of manufacturing a lens device, comprising: The lens barrel or the mount member is provided with a pin hole, and the other is provided with an adjustment hole having a hole diameter larger than the outer diameter of the pin attached to the pin hole,
The adjustment gap is a gap between the pin and the adjustment hole generated when a pin attached to the pin hole is inserted into the adjustment hole;
The method of manufacturing a lens device according to claim 4. The mount member includes a lens barrel fitting portion that is a fitting portion with the lens barrel and has an outer diameter smaller than the inner diameter of the inner peripheral surface of the lens barrel,
The adjustment gap is a gap between the lens barrel fitting portion and an inner peripheral surface of the lens barrel that are generated when the lens barrel and the mount member are fitted.
The method of manufacturing a lens device according to claim 4.

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