JP2003029114A - Optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure, whose optical performance is prevented from deteriorating by preventing the position of a guide rod to support the moving frames of a zoom lens and a focusing lens and the position of the yoke of a linear motor from deviating, when performing the tilt aligning of an optical system. SOLUTION: A G1 lens and a G2 lens in a first group lens 26 are attached directly to a front side lens barrel 21. Then, the front side lens barrel 21 is fixed at the front end part of an intermediate lens barrel 22. In contrast, the G3 lens of the first group lens 26 is held by a ring 47, which is independent of the front side lens barrel 21. A machine screw 51 put through the machine screw putting hole 52 of a press arm 48 of the ring 47 is screwed in and adjusted, while elastically deforming a spring washer 50 so that tilt alignment is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device, and more particularly to an optical device in which a group lens on the objective side is composed of a plurality of lenses and is attached to a front end portion of an intermediate lens barrel.

[0002]

2. Description of the Related Art FIG. 6 shows an optical device including a four-group inner focus zoom lens with a zoom function, which is used in conventional video cameras, electronic still cameras and the like. This device is composed of a first group lens 1 including three lenses G1, G2 and G3, a second group lens 2 including three lenses G4, G5 and G6, and three lenses G7, G8 and G9. It is composed of a third group lens 3 and a fourth group lens 4 of a single G10 lens. The first lens group 1 is housed and held in the front lens barrel 5, while the second lens group 2, the third lens group 3, and the fourth lens group 4 are housed in the rear intermediate lens barrel 6.

Here, in the rear intermediate lens barrel 6, there are a moving frame 7 for supporting the second group lens 2 and a moving frame 8 for supporting the fourth group lens 4, and these moving frames 7, 8 are guided. It is movably supported by a rod 9. The second group lens 2 is a zoom lens, and a zoom operation is performed by moving the moving frame 7 in the front-back direction by the guide rod 9. On the other hand, when the movable frame 8 to which the fourth group lens 4 is attached is moved in the front-rear direction by the guide rod 9, the focusing operation is performed.

In such a conventional optical device, as shown in FIG. 7, there are three locations on the outer periphery of the front end of the rear intermediate lens barrel 6 which are 120 degrees apart from each other in the circumferential direction, particularly for optical axis alignment. The mounting screws 11 are provided at the positions, and the spring washer 12 is provided on the outer peripheral side of these mounting seats 11.
The screw-in adjustment is made by 3. That is, the front side lens barrel 5 is tilted with respect to the front end portion of the rear side intermediate lens barrel 6 by the screwing amounts of the three adjusting screws 13 separated by 120 degrees, whereby the optical axis is arranged on the back side of the CCD. The center of the image pickup device 15 composed of the This device has an outer cylinder 1 that covers the entire device.
Covered by 4.

[0005]

In the optical device constituting the optical system of the image pickup device such as the video camera,
In order to adjust the optical performance to a certain level or higher, conventionally, the screwing amounts of the three screws 13 are adjusted so that
The entire first-group lens 1 shown in (1) is tilted or decentered. However, according to such a method, the positions of the guide rod 9 and the linear motor yoke sandwiched by the front lens barrel 5 and the intermediate lens barrel 6 or the rear lens barrel change. In the case of the guide rod 9, in order to influence the positions of the moving frames 7 and 8 which move along this,
There is a problem that optical performance such as zooming and focusing operations deteriorates.

Since the outer shape of the lens barrel is changed by aligning the whole of the first group lens 1 in this way, the way of contacting the exterior cabinet and the clearance at the time of mounting to the set are different from each other, which causes various problems. Was occurring. Further, according to the structure in which the entire first group lens 1 is aligned as described above, when the G1 lens of the first group lens 1 is pressed when the user operates this video camera, the first group lens 1 There is a problem that the optical performance is deteriorated due to misalignment of the entire alignment.

The present invention has been made in view of the above problems, and it is made such that even if the aligning operation is performed, it does not affect other parts or change their positions. An object is to provide an optical device.

[0008]

SUMMARY OF THE INVENTION The main invention of the present application is to provide an optical device in which an object side group lens is composed of a plurality of lenses and is attached to a front end portion of an intermediate lens barrel, in which an image pickup of the plurality of lenses is performed. The lens on the means side is attached to the front end portion of the intermediate lens barrel so that the angle can be adjusted, and the other lenses of the plurality of lenses except the lens on the imaging means side cannot be angle adjusted on the front end portion of the intermediate lens barrel. The present invention relates to an optical device characterized by being fixed to.

Here, the ring holding the lens on the image pickup means side of the plurality of lenses is attached to the front end portion of the intermediate lens barrel by a screw via an elastic means, and at this time, the screwing amount of the screw is set. By adjusting, the angle may be attached to the front end of the intermediate lens barrel so that the angle can be adjusted. Further, a zoom lens and a focus lens are arranged in the intermediate lens barrel so as to be movable in the optical axis direction, and a front end portion of guide means for guiding the zoom lens and the focus lens in the optical axis direction is a group on the object side. It may be fixed by a front lens barrel that holds other lenses in the lens except for the lens on the side of the image pickup means.

Another main invention of the present application is an optical device in which a group lens on the objective side is composed of a plurality of lenses, and is attached to the front end portion of an intermediate lens barrel. Is independently held by a ring, and while holding the other lenses of the plurality of lenses other than the lens on the side of the image pickup means in the front lens barrel, the ring is arranged in the front lens barrel, and A pressing arm projecting to the outer peripheral side is provided in series, the pressing arm is projected to the outer peripheral side through the insertion portion of the front lens barrel, and the pressing arm is adjustably screwed to the front end portion of the intermediate lens barrel via a spring. The present invention relates to an optical device characterized in that the front lens barrel is fixed to the intermediate lens barrel without adjusting the angle.

Here, the ring may be screwed to a mounting seat on the front end side of the intermediate lens barrel via a spring washer, and the front lens barrel may be directly fixed to the mounting seat of the intermediate lens barrel. Further, the insertion portion of the front lens barrel may be a notch formed on a joint surface of the front lens barrel with the intermediate lens barrel.

Still another main invention of the present application is an optical device in which a group lens on the objective side is composed of a plurality of lenses and is attached to the front end portion of an intermediate lens barrel, in which the image pickup means side of the plurality of lenses is located. The lens is independently held by a ring, and the other lenses of the plurality of lenses except for the lens on the imaging unit side are held in the front lens barrel, and the ring is arranged in the front lens barrel, A presser arm projecting to the outer peripheral side is continuously provided on the, and the presser arm is protruded to the outer peripheral side through the insertion portion of the front lens barrel, and the presser arm can be adjusted to the front end portion of the intermediate lens barrel via a spring. The present invention relates to an optical device, which is mounted by a screw and presses and fixes the front lens barrel to the front end portion of the intermediate lens barrel by a reaction force of the spring.

Here, the spring is a ring-shaped leaf spring attached to the outer peripheral portion of the front lens barrel, and the arm is held by a locking portion provided at a position corresponding to the pressing arm of the ring. It may be biased in a direction away from the front end of the tube. Further, the locking portion may be formed of a notch provided at a position corresponding to the arm of the ring, and the notch may be engaged with a claw formed at a tip end portion of the pressing arm. An intermediate position between the locking portions of the ring-shaped leaf spring presses a protrusion formed on the outer peripheral portion of the front lens barrel to press and fix the front lens barrel to the front end portion of the intermediate lens barrel. Good.

A preferred aspect of the invention included in the present application is that when the optical performance of an optical system of an image pickup device such as a video camera is adjusted to a certain level or higher, the objective side 1
A guide shaft and a linear motor sandwiched between the front lens barrel holding the first group lens and other parts by moving only one lens in the first group lens without moving the entire group lens The structure does not affect the position of the yoke and the like.

Here, by making the position of the first group lens unchanged during the above-described alignment, it is possible to obtain a structure that does not affect the clearance with the set outer casing including the cabinet. Further, at the time of the above alignment, the front lens barrel is coupled to the intermediate lens barrel in a state of being uniquely positioned, so that the G1 lens on the objective side of the first lens group is pushed when the user is using it. Even if it is done, the optical performance will not change.

Here, the front lens barrel holding the first group lens may be attached to the intermediate lens barrel by directly screwing the front lens barrel to the mounting seat of the intermediate lens barrel. Alternatively, a ring-shaped leaf spring that urges the holding arm of the ring that holds the G3 lens in the first lens group so as to separate from the intermediate lens barrel is used, and the front lens barrel moves the front lens barrel by the reaction force of the plate spring. It may be pressed and fixed to the front end of the.

[0017]

DETAILED DESCRIPTION OF THE INVENTION

First Embodiment The present invention will be described below with reference to the illustrated embodiment. FIG. 1 shows the overall configuration of an optical device according to a first embodiment of the present invention. This device is provided with a cylindrical outer cylinder 20 that constitutes the outer housing.
Further, in the outer cylinder 20, a front lens barrel 21 and a rear intermediate lens barrel 2 are provided.
2 and 2 are arranged in that order in the optical axis direction. The inside of the rear intermediate lens barrel 22 has approximately 18
A pair of guide rods 23 are arranged at positions separated by 0 degree.

Inside the front lens barrel 21, G1, G
A first-group lens 26 composed of 2 and G3 is arranged. On the other hand, in the rear side intermediate lens barrel 22, a second group lens 27 including G4, G5, and G6 and a third group lens including G7, G8, and G9 are provided.
A group lens 28 and a fourth group lens 29 composed of G10 are housed. Here, the second group lens 27 is held on the moving frame 31. The fourth group lens 29 is mounted on the moving frame 32. The moving frames 31 and 32 are moved in the optical axis direction by the guide rod 23. On the other hand, the third lens group 28 including G7, G8, and G9 is mounted on partition walls 33 and 34 provided at the intermediate position of the rear intermediate lens barrel 22.

An infrared filter 35, a low-pass filter 36, and an image sensor 37 are provided on the back side of the fourth group lens 29.
Are arranged in this order along the optical axis direction. Here, the infrared filter 35 and the low-pass filter 36 constitute an optical filter. The image sensor 37 is composed of a CCD.

In the above optical device, especially G
The second group lens 27 including 4, G5, and G6 constitutes a zoom lens, and when the moving frame 31 is moved along the guide rod 23, the zoom operation is performed. When the moving frame 31 is moved forward, it becomes wide, and when the moving frame 31 is moved backward, it becomes tele. On the other hand, the fourth group lens 29 constitutes a focus lens, and when the movable frame 32 is moved in the optical axis direction by the guide rod 23, the focus operation is performed. If the moving frame 32 is moved forward, the focal length becomes short, and if the moving frame 32 is moved backward, the focal length becomes long.

Next, a mechanism for aligning the optical axes of this optical device will be described. As shown in FIGS. 1 and 2, a flange 41 is continuously provided on the front lens barrel 21 on the side of the image pickup device, and the flange 41 has a circumferential length of 12 mm.
Position screw insertion holes 42 that are separated by 0 degrees are provided, and the three screws 43 that are inserted through the screw insertion holes 42 are inserted into the intermediate lens barrel 22.
The front lens barrel 21 is fixed to the front end portion of the intermediate lens barrel 22 by being screwed and fixed to the mounting seat 44.

The G3 lens in the first group lens 26 is held by the lens holding ring 47 independently of the other lenses. As shown in FIG. 2, the ring 47 has three presser arms 4 at positions separated by 120 degrees in the circumferential direction.
Eight. The holding arms 48 are received in the notches 49 of the front lens barrel 21.

The holding arm 48 is fixed to the front end portion of the intermediate lens barrel 22 with a screw 51 via a spring washer 50. That is, the screw 51 is pressed to hold the arm 48.
The screw insertion hole 52 is inserted, and the spring washer 50 is inserted and fixed to the mounting seat 53 of the intermediate lens barrel 22 by screwing.

Therefore, the ring 47 for holding the G3 lens is mounted by screwing the screw 51 while deforming the spring washer 50, and the gap between the lower surface of the arm 48 and the mounting seat 53 of the intermediate lens barrel 22 is arbitrary. Will be adjusted to. By such an adjustment, the angle of the optical axis of the G3 lens attached to the ring 47 can be adjusted.

Generally, in an optical system of an image pickup device such as a video camera, as shown in FIG. 1 and FIG.
And the rear lens barrel (not shown)
Both ends of are fixedly held. Then, the second group lens 27 constituting the zoom lens is moved along the optical axis by the guide rod 23 via the moving frame 31. Similarly, the yoke of the linear motor that generates thrust for moving the moving frame 31 is also fixed by the front barrel 21 and the intermediate barrel 22.

Here, the G1 lens and the G2 lens in the first lens group 26 are attached to the front lens barrel 21, while the G3 lens of the first lens group 26 is independent of the front lens barrel 21. The ring 47 is held by the ring 47, and the ring 47 is attached to the intermediate lens barrel 22 by the screw 51. In particular, the feature of this optical system is that the front lens barrel 21 is fixed in a uniquely positioned state with respect to the intermediate lens barrel 22 without changing its position.

When the optical performance is adjusted to a certain level or higher, the level can be adjusted by adjusting the ring 47 that holds the G3 lens in the first group lens 26 fixed. In the present embodiment, tilt adjustment, that is, tilt alignment, is used, but it can also be applied to shift, that is, eccentricity.

The ring 47 of the G3 lens receives a force in the optical axis direction by the spring washer 50 so as to be separated from the front end portion of the intermediate lens barrel 22, and the screw 51 receives this force. . Further, the spring washer 50 and the screw 51 are arranged at three locations in the circumferential direction. Screw 51
G3, depending on the balance of tightening
The position can be changed by changing the position in the tilting direction of the lens. By the way, the conventional structure (see FIGS. 6 and 7)
In (1), the G1 lens, the G2 lens, and the G3 lens are all attached to the front lens barrel 5, and the entire front lens barrel 5 is moved with respect to the intermediate lens barrel 6 to perform alignment. .

In the optical device of this embodiment, the front barrel 21 is uniquely positioned and fixed to the front end of the intermediate barrel 22, and the front barrel 21 and the G3 lens are held by the ring 47. Since the centering is performed independently, the position of the guide rod 23 does not change even if the G3 lens performs the centering operation. Therefore, the center of the second group lens 27 of the moving frame 31 and the center of the G4 lens of the fourth group lens 29 that move along the guide rod 23 do not change.

According to the conventional structure, when the front lens barrel 5 shown in FIG. 6 is moved and adjusted to perform the centering operation, the guide rod 9 moves together and the centering becomes difficult. However, according to the present embodiment, it is possible to accurately and easily perform the centering for improving the optical performance. Further, since the yoke of the linear motor that generates the thrust for moving the moving frames 31 and 32 is also sandwiched by the front lens barrel 21 and the intermediate lens barrel 22, the yoke is also affected. Never. Further, since the front lens barrel 21 is completely received by the front end portion of the intermediate lens barrel 22 and its position does not change due to alignment, the clearance and the like from the exterior of the set do not vary.

Further, when such an optical device is applied to a video camera, when the user applies a force to the G1 lens located at the outermost side during use, conventionally, the front lens barrel does not move due to this force. Although it was difficult to fix the lens barrel to the optical axis, it is possible to prevent the optical performance from deteriorating due to the displacement of the front lens barrel 21 as described above in the present embodiment.

As described above, in this embodiment, the front lens barrel 21
And the ring 47 of the G3 lens are independent members,
The ring 47 is fixed to the intermediate lens barrel 22 with three screws 51 via spring washers 50. At this time, by adjusting the screwing amount of each screw 51, G
The tilt angle of the three lenses can be made variable, whereby the tilt alignment of the G3 lens is performed. On the other hand, the front lens barrel 21 is directly fastened and fixed to the mounting seat 44 on the front end side of the intermediate lens barrel 22 with three screws 43. At this time, when adopting a structure in which the yoke of the linear motor and the front end of the guide rod 23 are received and fixed by the front lens barrel 21, even if the G3 lens is aligned, the postures of other members are not affected. It becomes possible to do.

In this embodiment, as described above, the first group lens 2
Instead of aligning the entire 6 lens, only the G1 lens, the G2 lens, and the G3 lens in the G3 lens included in the first lens group are independently aligned. Therefore, the optical performance can be improved accurately and easily without affecting the positions of the guide rod 23, the various moving frames 31 and 32 moving along the guide rod 23, the yoke of the linear motor, and the like.

The front lens barrel 2 for holding the first-group lens 26
Since the centering can be performed without changing the position of 1, the clearance between the outer casing of the set and the receiving is not affected. Further, when the user uses a video camera using this optical system, even if the G1 lens in the first lens group 26 is pressed by an external force, the front lens barrel 21 forming the first lens group frame with respect to the intermediate lens barrel 22. The optical performance is not deteriorated because it is received by the surface and does not move.

[0035]

Second Embodiment Next, a second embodiment will be described with reference to FIGS. In this embodiment, a single ring-shaped leaf spring 56 is used in place of the three spring washers 50 of the first embodiment, and the ring-shaped leaf spring 56 causes the front lens barrel 21 to move to the intermediate lens barrel. The screw 43 for mounting and fixing the front lens barrel 21 is omitted by pressing and urging the front end face of 22.

The ring-shaped leaf spring 56 is made of spring steel or phosphor bronze, and is formed with a bent portion 57 projecting to the outer peripheral side at positions separated by 120 degrees in the circumferential direction.
The ring-shaped leaf spring 56 may be made of another elastic material. A notch 58 is formed in each of the bent portions 57, and the notch 58 is engaged with a claw 59 provided at the tip of the pressing arm 48 of the ring 47 of the G3 lens. Then, the protrusion 60 provided on the flange 41 of the front lens barrel 21 is pressed at an intermediate position between the bent portions 57 of the ring-shaped leaf spring 56, whereby the front lens barrel 21 is moved to the front end surface of the intermediate lens barrel 22. It is crimped to.

That is, this embodiment is characterized in that the ring-shaped leaf spring 56 serves to both fix the front barrel 21 and to urge the ring 47. The ring 47 is inserted into the back side of the front barrel 21 and the ring-shaped leaf spring 56 is attached from the front of the front barrel 21. Then, the claws 59 of the pressing arm 48 of the ring 47 are engaged with the notches 58 of the three bent portions 57 in the circumferential direction of the leaf spring 56.

In this state, the front barrel 21 and the ring 4
7 and a leaf spring 56 are attached to the intermediate lens barrel 22.
Is fastened to the front end of the with three screws 51. At this time, the projection 60 of the front lens barrel 21 is pressed downward in FIG. 5 by the reaction force of the leaf spring 56, and the front lens barrel 21 is pressure-fixed to the front end surface of the intermediate lens barrel 22. Further, in the ring 47, the tip end of the arm 48 receives an upward force by the notch 58 of the bent portion 57 of the leaf spring 56, and the arm 48 is biased to the seat surface of the screw 51. Therefore, by adjusting the screwing of the screw 51, the ring 47
The tilt adjustment becomes possible.

Such a structure is apparent from comparison with the first embodiment described above, in which the front lens barrel 21 is replaced with the intermediate lens barrel 22.
No need for three screws 43 to secure to
Instead of the individual spring washers 50, a single leaf spring 56 can be used. Further, the mounting seat 44 for fixing the front lens barrel 21 is not required on the side of the intermediate lens barrel 22. Further, at the time of assembly, only screw tightening of the screws 51 and snap fitting are required, which reduces the number of assembling steps. Further, since the spring washer 50 in the first embodiment is not used, there is an advantage that the trouble of dropping the spring washer 50 into the lens barrel is prevented and the assembling becomes easy.

[0040]

According to the main invention of the present application, in the optical device in which the group lens on the objective side is composed of a plurality of lenses and is attached to the front end portion of the intermediate lens barrel, the lens on the image pickup means side among the plurality of lenses is The lens is attached to the front end of the intermediate lens barrel so that the angle can be adjusted, and the other lenses of the plurality of lenses except the lens on the image pickup means side are fixed to the front end of the intermediate lens barrel without adjusting the angle.

Therefore, according to such an optical device, the optical alignment is performed only by adjusting the angle of the lens on the image pickup means side among the plurality of lenses, and the operation of the optical alignment does not become large and the optical alignment is not performed. Provided is a structure in which optical performance is not deteriorated even when cored.

Another main invention of the present application is that, in an optical device in which a group lens on the objective side is composed of a plurality of lenses and is attached to the front end portion of an intermediate lens barrel, the lens on the image pickup means side among the plurality of lenses is It is held independently by a ring, and other lenses except the lens on the imaging device side among the multiple lenses are held in the front lens barrel, and the ring is placed in the front lens barrel and the presser foot that protrudes to the outer peripheral side of the ring Arms are connected in series, the pressing arm is projected to the outer peripheral side through the insertion part of the front lens barrel, and the pressing arm is adjustably attached to the front end of the intermediate lens barrel with a spring, and the front lens barrel is intermediate. It is fixed to the lens barrel so that the angle cannot be adjusted.

Therefore, the aligning operation is performed only by screwing the holding arm into the intermediate lens barrel, and the components fixed by the front lens barrel are not adversely affected and the optical performance is deteriorated. To be prevented.

Still another main invention of the present application is that, in an optical device in which a group lens on the objective side is composed of a plurality of lenses and is attached to a front end portion of an intermediate lens barrel, a lens on an image pickup means side of the plurality of lenses is provided. Hold independently by a ring,
Among the plurality of lenses, other lenses except the lens on the image pickup means side are held in the front lens barrel, the ring is arranged in the front lens barrel, and a holding arm protruding to the outer peripheral side is continuously provided to the ring, The presser arm is projected to the outer peripheral side through the insertion part of the front lens barrel, the presser arm is attached to the front end of the intermediate lens barrel via a spring so that it can be adjusted with screws, and the front lens barrel is driven by the reaction force of the spring. Is fixed to the front end of the.

Therefore, according to such an optical device, the centering operation is performed by adjusting the screwing of the pressing arm against the biasing force of the spring. Moreover, since the front lens barrel is pressed and fixed to the front end portion of the intermediate lens barrel by the reaction force of the spring, there is no need for a dedicated fixing means for fixing the front lens barrel, thereby reducing the number of parts and Assembly man-hours are reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an optical device according to a first embodiment.

FIG. 2 is an exploded perspective view showing an assembly of a front barrel of the optical device.

FIG. 3 is an exploded perspective view showing an assembly of a front lens barrel of an optical device according to a second embodiment.

FIG. 4 is an external perspective view of a main part in the assembled state.

FIG. 5 is a side view of the same assembled state.

FIG. 6 is a vertical cross-sectional view of a conventional optical device.

FIG. 7 is an exploded perspective view of the optical device.

[Explanation of symbols]

1 group lens (G1, G2, G3), 2 group lens (G4, G5, G6), 3 group 3 lens (G7,
G8, G9), 4 group lens (G10), 5 ... front lens barrel, 6 ... intermediate lens barrel, 7, 8 ... moving frame, 9 ... guide rod, 11 ... mounting seat, 12・ ・ ・ Spring, 13 ‥
Adjustment screw, 14 Outer cylinder, 15 Image sensor (CC
D), 20 ... Outer cylinder, 21 ... Front lens barrel, 22 ... Intermediate lens barrel, 23 ... Guide rod, 26 ... Group 1 lens (G
1, G2, G3), 27 ... Group 2 lens (G4, G5,
G6), 28 ... 3 group lens (G7, G8, G9), 2
9-group 4 lens (G10), 31, 32 ... moving frame,
33, 34 ... Partition walls, 35 ... Infrared filters, 3
6 ... Low-pass filter, 37 ... Image sensor, 41 ...
Flange 42, screw insertion hole 43, screw 44
・ ・ ・ Mounting seat, 47 ・ ・ ・ Ring, 48 ・ ・ ・ Pressing arm, 4
9 notches, 50 spring washers, 51 screws, 52
・ ・ ・ Screw insertion hole, 53 ・ ・ ・ Mounting seat, 56 ・ ・ ・ Ring-shaped leaf spring, 57 ・ ・ ・ Bending part, 58 ・ ・ ・ Notch, 59 ・ ・ ・
Claw, 60 ... Projection

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 17/02 G02B 7/04 D (72) Inventor Masanori Hayashi 2170 Omigawa, Omigawa, Katori-gun, Chiba Prefecture Component F term in Chiba Co., Ltd. (reference) 2H044 AC03 AJ01 AJ04 AJ06 DA01 DA02 EC01 2H100 BB01

Claims (10)

[Claims] 1. An optical device in which a group lens on the objective side is composed of a plurality of lenses and is attached to a front end portion of an intermediate lens barrel, wherein a lens on an image pickup means side of the plurality of lenses is a front end of the intermediate lens barrel. An optical device, wherein the lens is attached to the lens unit so that the angle can be adjusted, and the other lenses of the plurality of lenses except the lens on the side of the imaging unit are fixed to the front end of the intermediate lens barrel without being able to adjust the angle. 2. A ring holding a lens on the image pickup means side of the plurality of lenses is attached to the front end portion of the intermediate lens barrel by a screw via an elastic means, and at this time, the screwing amount of the screw is adjusted. The angle is adjustable so as to be attached to the front end portion of the intermediate lens barrel by adjustment.
The optical device according to. 3. A zoom lens and a focus lens are disposed in the intermediate lens barrel so as to be movable in the optical axis direction, and
A front end portion of a guide unit that guides the zoom lens and the focus lens in the optical axis direction is fixed by a front lens barrel that holds a lens other than a lens on the image pickup unit side in the group lens on the objective side. The optical device according to claim 1. 4. An optical device in which a group lens on the objective side is composed of a plurality of lenses and is attached to the front end of an intermediate lens barrel, wherein the lens on the image pickup means side of the plurality of lenses is independently held by a ring. A holding arm that holds the other lenses of the plurality of lenses other than the lens on the side of the image pickup means in the front lens barrel, arranges the ring in the front lens barrel, and projects to the outer peripheral side of the ring. And the pressing arm is projected to the outer peripheral side through the insertion portion of the front lens barrel, and the pressing arm is adjustably attached to the front end portion of the intermediate lens barrel with a spring through the front mirror. An optical device, characterized in that a tube is fixed to the intermediate lens barrel so that the angle cannot be adjusted. 5. The ring is screwed to a mounting seat on the front end side of the intermediate lens barrel via a spring washer, and
The optical device according to claim 4, wherein the front lens barrel is directly fixed to a mounting seat of the intermediate lens barrel. 6. The optical device according to claim 4, wherein the insertion portion of the front lens barrel is a notch formed in a joint surface of the front lens barrel with the intermediate lens barrel. 7. An optical device in which a group lens on the objective side is composed of a plurality of lenses and is attached to a front end portion of an intermediate lens barrel, wherein a lens on an image pickup means side among the plurality of lenses is independently held by a ring. A holding arm that holds the other lenses of the plurality of lenses other than the lens on the side of the image pickup means in the front lens barrel, arranges the ring in the front lens barrel, and projects to the outer peripheral side of the ring. And the pressing arm is projected to the outer peripheral side through the insertion portion of the front lens barrel, and the pressing arm is adjustably attached to the front end portion of the intermediate lens barrel with a spring through the front mirror. An optical device, wherein a barrel is pressed and fixed to a front end portion of the intermediate barrel by a reaction force of the spring. 8. The spring comprises a ring-shaped leaf spring attached to an outer peripheral portion of the front lens barrel, and the arm is provided with a locking portion provided at a position corresponding to a pressing arm of the ring. The optical device according to claim 7, wherein the optical device is biased in a direction away from the front end portion of the cylinder. 9. The locking portion comprises a notch provided at a position corresponding to the arm of the ring, and the notch is engaged with a claw formed at a tip portion of the pressing arm. The optical device according to claim 8, which is characterized in that: 10. An intermediate position between locking portions of the ring-shaped leaf spring presses a protrusion formed on an outer peripheral portion of the front barrel to bring the front barrel to a front end portion of the intermediate barrel. The optical device according to claim 8, wherein the optical device is fixed by pressing.