JP2021009268A - Lens device - Google Patents

Abstract

To obtain a sufficient deviation prevention effect for an adjustment position of an adjustment ring, and to achieve an easy and accurate adjustment by the adjustment ring even in the case of installation in an environment subject to an influence of vibration, shock, or the like.SOLUTION: A lens device includes an adjustment ring fixation mechanism Mc including: a pressing ring part 5 that is fitted so as to be rotated and operated in a circumferential direction Ff via a screw part 4, and forms an opposite face 5c that opposes an opposed face 3c in an adjustment ring 3 relative to a fixed cylinder part 2; an intermediate ring part 6 interposed between the opposite face 5c and the opposed face 3c; a displacement regulation part 7 that permits displacement to a light axis direction Fc of the intermediate ring part 6 and regulates displacement to the circumferential direction Ff; and a ring lock part 8 that locks a position of the pressing ring part 5 relative to the fixed cylinder part 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lens device including a lens barrel having an adjustment ring that can be rotated in the circumferential direction of the fixed barrel portion.

Conventionally, a lens device for projection, which is mounted on a projector or the like and includes a lens barrel having an adjustment ring such as a zoom adjustment ring and a focus adjustment ring that can be rotated in the circumferential direction of a fixed cylinder portion, is known. By the way, in the case of a lens device mounted on a projector, there is a problem that the adjustment position of the adjustment ring gradually shifts due to long-term use depending on the installation condition of the projector. For example, if the projector is installed by a ceiling suspension method and the lens device is tilted downward, the zooming position will gradually shift due to long-term use even if the zoom adjustment ring is used to adjust the zooming at the time of initial installation. Once the zooming position shifts, it is not easy to readjust the projector installed by the ceiling suspension method.

Therefore, the applicant has already proposed a lens device that effectively solves this problem with reference to Patent Document 1. This lens device eliminates the problem that the adjustment position of the rotating cylinder (adjustment ring) shifts, eliminates the need for troublesome readjustment work, avoids viewing at an inappropriate adjustment position, and in addition, rotates. The purpose is to set the operability and operating force when rotating the moving cylinder to the optimum state. Specifically, the rotating cylinder that can be rotated with respect to the fixed cylinder. When constructing a lens device having a lens barrel to which a portion is mounted, a rotation operation torque at least when the rotation cylinder portion is rotated is set to a predetermined size between the fixed cylinder portion and the rotation cylinder portion. It is configured by interposing a torque setting member that can be set in.

Japanese Unexamined Patent Publication No. 2010-14766

However, the lens device described in Patent Document 1 described above also has the following problems to be solved.

First, in order to set the magnitude of the rotation operation torque with the torque setting member and prevent the rotation cylinder (adjustment ring) from shifting with respect to the adjustment position, when the lens device is mounted on the projector, it is a small lens device. In the case of, a certain degree of deviation prevention effect can be obtained, but the structure and installation of the lens device, such as in the case of a large (heavy) lens device or when installed in an environment susceptible to vibration, impact, etc. Depending on the environment, it is difficult to obtain a sufficient slip prevention effect.

Secondly, the magnitude of the rotation operation torque is set by a torque setting member using an elastic material or a friction material, and the rotation operation torque usually needs to be set to a large value for the purpose of preventing deviation. is there. For this reason, especially in the case of a large lens device, a large operating force is required, which may adversely affect the operability, and accurate adjustment due to the influence of the elastic material or the friction material. Is difficult to do.

An object of the present invention is to provide a lens device that solves the problems existing in such a background technique.

In order to solve the above-mentioned problems, the present invention relates to a fixed cylinder portion when configuring a lens device 1 including a lens barrel S having an adjustment ring 3 that can be rotated in the circumferential direction Ff with respect to the fixed cylinder portion 2. 2 is mounted so as to be rotatable in the circumferential direction Ff via the screwed portion 4, and is opposed to the pressing ring portion 5 which forms the facing surface 5c facing the opposed surface 3c of the adjusting ring 3. An intermediate ring portion 6 interposed between the surface 5c and the facing surface 3c, and a displacement regulating portion 7 that allows displacement of the intermediate ring portion 6 in the optical axis direction Fc and regulates displacement in the circumferential direction Ff. It is characterized by comprising an adjusting ring fixing mechanism Mc having a ring lock portion 8 for locking the position of the pressing ring portion 5 with respect to the fixed cylinder portion 2.

In this case, according to a preferred embodiment of the invention, the adjustment ring 3 may include one or more of a focus adjustment ring 3f, a zoom adjustment ring, and an iris adjustment ring. On the other hand, in the intermediate ring portion 6, at least a portion where displacement in the circumferential direction Ff is restricted can be formed of a hard material. Further, the displacement regulating portion 7 protrudes from the linear slit 11 formed on one side of the inner peripheral surface 6i of the intermediate ring portion 6 or the outer peripheral surface 2f of the fixed cylinder portion 2 and is parallel to the optical axis direction Fc, and protrudes from the other. It can be configured by an engagement restricting portion 12 that engages with the straight slit 11. It is desirable that the engagement restricting portion 12 is composed of an engagement pin 12p having a circular cross section. Further, the ring lock portion 8 is screwed to the radial Fd of the peripheral surface portion 5 m of the pressing ring portion 5, and the tip portion 13s exposed from the inner peripheral surface 5i of the peripheral surface portion 5 m by the rotation operation is the fixed tubular portion 2. A lock screw 13 that can come into contact with the surface can be used.

According to the lens device 1 according to the present invention having such a configuration, the following remarkable effects are obtained.

(1) The pressing ring portion 5 which is mounted via the screwed portion 4 and forms the facing surface 5c facing the facing surface 3c in the adjusting ring 3 is interposed between the facing surface 5c and the facing surface 3c. Locks the positions of the intermediate ring portion 6 that allows displacement in the optical axis direction Fc and the displacement in the circumferential direction Ff with respect to the fixed cylinder portion 2 and the pressing ring portion 5 with respect to the fixed cylinder portion 2. Since the adjustment ring fixing mechanism Mc having the ring lock portion 8 is provided, the adjustment ring 3 is sufficiently displaced from the adjustment position even when installed in an environment susceptible to vibration, impact, or the like. A preventive effect (displacement prevention effect) can be obtained. Therefore, the effectiveness can be enhanced especially when a large lens device 1 having a large weight is installed vertically or at an angle.

(2) Since torque setting members such as elastic materials and friction materials that affect the rotation operation of the adjustment ring 3 are not used and it is not necessary to increase the rotation operation torque of the adjustment ring 3, the optimum operation force and further Can ensure operability. Therefore, the adjustment by the rotation operation of the adjustment ring 3 can be easily and accurately performed.

(3) According to a preferred embodiment, if the adjustment ring 3 includes one or more of the focus adjustment ring 3f, the zoom adjustment ring, and the iris adjustment ring, it is possible to prevent the focus adjustment ring 3f from being displaced, which cannot be ignored as a problem. In addition to improving operability, the same effect can be applied to the zoom adjustment ring and iris adjustment ring, which can contribute to the improvement of the added value of the entire lens device 1 and the improvement of the commercial value.

(4) According to a preferred embodiment, if the portion of the intermediate ring portion 6 whose displacement in the circumferential direction Ff is restricted is formed of a hard material, the intermediate ring portion 6 can be prevented from being displaced from the material surface and the rigid surface. It can contribute to further improvement of the displacement prevention effect of the intermediate ring portion 6.

(5) According to a preferred embodiment, the displacement restricting portion 7 is formed on one of the inner peripheral surface 6i of the intermediate ring portion 6 or the outer peripheral surface 2f of the fixed cylinder portion 2 and is parallel to the optical axis direction Fc. If it is composed of the engagement restricting portion 12 that protrudes from the other side and engages with the straight slit 11, the displacement regulating portion 7 can be configured by simple processing and structure, so that it can be carried out easily and at low cost.

(6) According to a preferred embodiment, if the engagement restricting portion 12 is configured by the engagement pin 12p having a circular cross section, the engagement restricting portion 12 (engagement pin 12p) and the straight slit 11 can be engaged in line contact. Therefore, it is possible to secure a sufficient deviation prevention effect that ensures accuracy without impairing the rigidity associated with the deviation prevention structure.

(7) According to a preferred embodiment, the tip portion 13s is screwed onto the ring lock portion 8 in the radial direction Fd of the peripheral surface portion 5 m of the pressing ring portion 5, and is exposed from the inner peripheral surface 5i of the peripheral surface portion 5 m by a rotation operation. If a lock screw 13 that can come into contact with the fixed cylinder portion 2 is used, the rotation operation can be easily performed by providing a handle portion or the like, so that the fixed cylinder portion 2 and the pressing ring portion 5 can be reliably fixed.

A side sectional view showing a part of a lens boundary cylinder including a main part configuration in the lens device according to a preferred embodiment of the present invention. A cross-sectional view taken along line AA in FIG. 3, which includes a partially extracted enlarged view of the lens device, Side sectional view showing a part of the lens boundary tube in the lens device, A layout diagram showing the relationship between the linear slit and the protrusion on the inner peripheral surface of the intermediate ring portion provided in the lens device when viewed from the center direction. An explanatory diagram of the installation state of a projector equipped with the same lens device, Explanation of the operation of the adjustment ring fixing mechanism before adjustment of the adjustment ring provided in the lens device, Explanation of the operation of the adjustment ring fixing mechanism after adjustment of the adjustment ring provided in the lens device, A cross-sectional view corresponding to a partially extracted enlarged view in FIG. 2 showing an example of modification of the adjustment ring fixing mechanism in the lens device, A cross-sectional view at the same position as FIG. 6, showing another modification of the adjustment ring fixing mechanism in the lens device.

Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

First, the configuration of the lens device 1 according to the present embodiment will be specifically described with reference to FIGS. 1 to 7.

FIG. 5 shows a large projector P equipped with the lens device 1 according to the present embodiment. This projector P shows a case where it is installed on an inclined surface K and projects onto a projection surface (not shown) obliquely above. Further, the lens device 1 includes a lens barrel S, and a focus adjustment ring 3f, a zoom adjustment ring and an iris adjustment ring not shown in the figure are provided on the outer peripheral portion of the lens barrel S. These focus adjustment ring 3f, zoom adjustment ring and iris adjustment ring constitute the adjustment ring 3.

FIG. 3 shows a part of the lens barrel S including the main part configuration of the lens device 1. Therefore, FIG. 3 includes a focus adjusting mechanism Mf and an adjusting ring fixing mechanism Mc. The lens barrel S is provided with a fixed cylinder portion 2, and the inner side of the fixed cylinder portion 2 is in contact with the inner peripheral surface 2i of the fixed cylinder portion 2 and is allowed to be displaced in the optical axis direction Fc. A focus lens support cylinder 21 is provided, and a focus adjustment ring 3f that is in contact with the outer peripheral surface 2f of the fixed cylinder portion 2 and is allowed to be displaced in the circumferential direction Ff is provided on the outer side of the fixed cylinder portion 2. .. The focus adjustment ring 3f is formed in a tubular shape as a whole, a grip portion 3fg for rotation operation is formed on the front portion of the outer peripheral surface, and a facing surface formed on the pressing ring portion 5 described later is formed on the rear end surface. A surface to be faced 3c facing 5c is formed. On the other hand, the focus lens support cylinder 21 has a lens support portion 21s on the inner peripheral surface, and the plurality of focus lenses L1, L2, and L3 are supported by the lens support portion 21s. It should be noted that the illustrated focus lenses L1, L2, and L3 schematically show the existence of the lens and do not have accuracy.

Further, as shown in FIG. 1, a plurality of sets of guide grooves 22 ... (Example: three sets in the circumferential direction Ff) parallel to the optical axis direction Fc of the fixed cylinder portion 2 are formed, and the circumference of the focus adjustment ring 3f is formed. An inclined cam groove 23 ... Corresponding to the guide groove 22 ... Is formed in the direction Ff. Reference numeral 24 denotes a plurality of sets of guide grooves formed parallel to the circumferential direction Ff of the focus adjustment ring 3f. Then, a plurality of sets of roller portions 25 ... configured in a roller shape are attached to the outer peripheral surface of the focus lens support cylinder 21, engaged with the guide grooves 22 ... and the cam grooves 23 ..., and the outer peripheral surface of the fixed cylinder portion 2. A plurality of sets of roller portions 26 ... Attached to 2f are engaged with the guide grooves 24 ....

As a result, if the grip portion 3fg of the focus adjustment ring 3f is rotated in the circumferential direction Ff of the fixed cylinder portion 2, this rotational displacement is transmitted to the roller portions 25 ..., and the motion is further converted to cause the focus lens. It is transmitted to the support cylinder 21. As a result, the focus lenses L1, L2, and L3 are displaced in the optical axis direction Fc to form a focus adjustment mechanism Mf capable of performing focus adjustment.

On the other hand, the focus adjusting mechanism Mf is provided with an adjusting ring fixing mechanism Mc that constitutes a main part of the present invention. In the example, this adjusting ring fixing mechanism Mc includes a pressing ring portion 5, an intermediate ring portion 6, a displacement regulating portion 7, and a ring lock portion 8 as components.

As shown in FIGS. 1 to 3, the pressing ring portion 5 is formed in a tubular shape as a whole, and is mounted on the fixed tubular portion 2 so as to be rotatable in the circumferential direction Ff via the screwing portion 4. .. That is, as shown in FIG. 7, the screw portion 4 is formed on the outer peripheral surface 2f of the fixed cylinder portion 2 in which the female screw portion 4i formed on the inner peripheral surface of the rear portion of the pressing ring portion 5 and the female screw portion 4i face each other. It is composed of the formed male screw portion 4f. Further, a grip portion 5g shown in FIG. 1 for a rotation operation is formed near the front end of the outer peripheral surface of the pressing ring portion 5. Further, the peripheral surface portion 5m, which is a part of the pressing ring portion 5 near the rear portion, is formed to be thick, and the inner peripheral surface 5i of the peripheral surface portion 5m is in contact with the outer peripheral surface 2f of the fixed cylinder portion 2 and the pressing ring portion 2. The front portion of the portion 5 is formed to have a thin wall with respect to the inner peripheral surface 5i via the stepped surface, and has a cover function for the focus adjusting ring 3f. As a result, the front portion of the pressing ring portion 5 covers the outer peripheral surface of the focus adjusting ring 3f on the rear side except for the grip portion 3fg. The stepped surface formed on the front side of the inner peripheral surface 5i of the peripheral surface portion 5 m is the facing surface 5c of the pressing ring portion 5 facing (facing) the opposed surface 3c formed on the rear end surface of the focus adjustment ring 3f described above. Become.

As shown in FIG. 6, the ring lock portion 8 is screwed into the radial Fd of the peripheral surface portion 5 m of the pressing ring portion 5, and the tip portion 13s exposed from the inner peripheral surface 5i of the peripheral surface portion 5 m by a rotation operation is formed. A lock screw 13 capable of contacting the outer peripheral surface 2f of the fixed cylinder portion 2 was used. That is, a screw hole portion 31 penetrating from the outer peripheral surface to the inner peripheral surface 5i is formed in the peripheral surface portion 5 m of the pressing ring portion 5, and the screw rod portion 32 of the lock screw 13 is screwed into the screw hole portion 31. did. Further, the lock screw 13 integrally has a handle portion 33 for turning and operating the lock screw 13 at the outer end of the screw rod portion 32. As a result, the ring lock portion 8 is configured so that the position of the pressing ring portion 5 can be locked (fixable) with respect to the fixed cylinder portion 2. If such a lock screw 13 is used, the rotation operation can be easily performed by providing the handle portion or the like, so that the fixing cylinder portion 2 and the pressing ring portion 5 can be reliably fixed.

The intermediate ring portion 6 is arranged behind the facing surface 3c of the focus adjustment ring 3f, and is interposed between the facing surface 3c and the facing surface 5c of the pressing ring portion 5. Therefore, a gap capable of accommodating the intermediate ring portion 6 is secured between the facing surface 3c and the facing surface 5c (see FIG. 6). The intermediate ring portion 6 is formed to have a constant thickness in the optical axis direction Fc, and the inner diameter is selected to be substantially the same as the inner diameter of the focus adjustment ring 3f so that the intermediate ring portion 6 can be freely displaced on the outer peripheral surface 2f of the fixed cylinder portion 2. Displace. The intermediate ring portion 6 is integrally formed of a hard material such as a metal material or a hard synthetic resin material. As a result, the portion of the intermediate ring portion 6 whose displacement in the circumferential direction Ff is restricted is formed of a hard material. When formed in this way, deviation can be prevented from the material surface and the rigid surface of the intermediate ring portion 6, so that it is possible to contribute to further improvement of the deviation prevention effect of the intermediate ring portion 6.

As shown in FIGS. 2 and 4, the displacement regulating portion 7 forms a straight slit 11 having a rectangular cross section parallel to the optical axis direction Fc on the inner peripheral surface 6i of the intermediate ring portion 6, and the fixed cylinder portion 2 An engagement restricting portion 12 that protrudes from the outer peripheral surface 2f of the above and engages with the straight slit 11 is provided. In the example, the engagement restricting portion 12 has a hole portion 35 in the radial direction Fd formed on the outer peripheral surface 2f of the fixed cylinder portion 2, and the hole portion 35 has a circular cross section formed of a hard material such as a metal material. The engagement pin 12p was inserted and fixed. As shown in FIG. 4, the engaging pin 12p makes the outer diameter Lp match the width dimension Lw of the straight slit 11. When fixing the engaging pin 12p to the hole 35, it can be inserted and fixed by various methods such as a screwing method and a press-fitting method. Further, it is desirable that the tip of the engaging pin 12p is formed in a spherical shape.

The displacement regulating portion 7 regulates the displacement of the fixed cylinder portion 2 in the circumferential direction Ff and allows the intermediate ring portion 6 to be displaced in the optical axis direction Fc. As described above, when the displacement regulating portion 7 is formed, the linear slit 11 formed on the inner peripheral surface 6i of the intermediate ring portion 6 parallel to the optical axis direction Fc and the outer peripheral surface 2f of the fixed cylinder portion 2 protrude and form. If it is configured by the engagement restricting portion 12 that engages with the straight slit 11, it can be configured by simple processing and structure, so that it can be carried out easily and at low cost. Further, if the engagement restricting portion 12 is configured by the engagement pin 12p having a circular cross section, the engagement restricting portion 12 (engagement pin 12p) and the straight slit 11 can be engaged in line contact engagement, so that the displacement is prevented. It is possible to secure a sufficient deviation prevention effect that ensures accuracy without impairing the rigidity associated with the structure.

Next, the functions (actions) of the main parts of the lens device 1 according to the present embodiment will be described with reference to FIGS. 6 and 7 with reference to each figure.

First, the state of the adjustment ring fixing mechanism Mc before the adjustment of the focus adjustment ring 3f provided in the lens device 1 will be described with reference to FIG. Before adjusting the focus adjustment ring 3f, the handle portion 33 of the lock screw 13 is turned in the loosening direction to separate the tip portion 13s of the lock screw 13 (screw rod portion 32) from the outer peripheral surface 2f of the fixed cylinder portion 2. The lock on the position of the pressing ring portion 5 is released. Ls in FIG. 6 indicates a separated gap. Then, the grip portion 5g (FIG. 1) of the pressing ring portion 5 that has been unlocked is rotated to displace the pressing ring portion 5 in the direction away from the focus adjusting ring 3f, thereby causing the focus adjusting ring 3f (intermediate). The play of the gap Lu shown in FIG. 6 is secured between the ring portion 6) and the ring portion 6).

As a result, the regulation (fixation) of the focus adjustment ring 3f by the adjustment ring fixing mechanism Mc is released. Therefore, the grip portion 3fg of the focus adjustment ring 3f shown in FIG. 1 is rotated in the circumferential direction Ff with respect to the fixed cylinder portion 2. When the motion is operated, this rotational displacement is transmitted to the roller portions 25 ..., and further motion-converted to be transmitted to the focus lens support cylinder 21. As a result, the focus lenses L1, L2, and L3 are displaced in the optical axis direction Fc, and the focus can be adjusted. Then, when the focus adjustment is completed, the position of the focus adjustment ring 3f after the adjustment is fixed by using the adjustment ring fixing mechanism Mc.

Next, an operation of fixing the position of the focus adjustment ring 3f after adjustment by using this adjustment ring fixing mechanism Mc will be described with reference to FIG. 7. In this case, first, the grip portion 5g of the pressing ring portion 5 shown in FIG. 1 is rotated to displace the pressing ring portion 5 forward. As a result, the intermediate ring portion 6 and the focus adjusting ring 3f are pressed (pressurized) by the facing surface 5c of the pressing ring portion 5, and the position of the focus adjusting ring 3f is fixed by pressure welding. At this time, since the intermediate ring portion 6 is allowed to be displaced in the optical axis direction Fc and the displacement in the circumferential direction Ff is restricted with respect to the fixed cylinder portion 2, the pressing force of the pressing ring portion 5 is applied. It is transmitted only to the optical axis direction Fc, and the displacement in the rotation direction is not transmitted to the focus adjustment ring 3f. Therefore, the problem that the position of the focus adjustment ring 3f is displaced after the adjustment is avoided, and the position of the focus adjustment ring 3f is fixed. Luo in FIG. 7 shows a state in which the gap (play) between the focus adjusting ring 3f (intermediate ring portion 6) and the pressing ring portion 5 becomes zero and pressure contact is performed.

Then, after that, the handle portion 33 of the lock screw 13 is turned in the tightening direction, and the tip portion 13s of the lock screw 13 (screw rod portion 32) is pressed against the outer peripheral surface 2f of the fixed cylinder portion 2 to press the pressing ring portion 5 Lock the position of. Lso in FIG. 7 indicates a state in which the tip portion 13s of the lock screw 13 is pressed against the outer peripheral surface 2f of the fixed cylinder portion 2 and the gap Ls in FIG. 6 becomes zero.

Therefore, according to the lens device 1 according to the present embodiment, as a basic configuration, the fixed cylinder portion 2 is mounted so as to be rotatable in the circumferential direction Ff via the screw portion 4, and the adjustment ring 3 is attached. The pressing ring portion 5 forming the facing surface 5c facing the facing surface 3c, the intermediate ring portion 6 interposed between the facing surface 5c and the facing surface 3c, and the optical axis direction of the intermediate ring portion 6. An adjustment ring having a displacement regulating portion 7 that allows displacement to the Fc and regulates the displacement in the circumferential direction Ff, and a ring locking portion 8 that locks the position of the pressing ring portion 5 with respect to the fixed cylinder portion 2. Since the fixing mechanism Mc is provided, a sufficient displacement prevention effect (displacement prevention effect) with respect to the adjustment position of the adjustment ring 3 can be obtained even when the lens is installed in an environment susceptible to vibration, impact, or the like. Therefore, the effectiveness can be enhanced especially when a large lens device 1 having a large weight is installed vertically or at an angle.

Further, since torque setting members such as elastic materials and friction materials that affect the rotation operation of the adjustment ring 3 are not used and it is not necessary to increase the rotation operation torque of the adjustment ring 3, the optimum operation force and further Operability can be ensured. Therefore, the adjustment by the rotation operation of the adjustment ring 3 can be easily and accurately performed. In particular, if the focus adjustment ring 3f is applied to the adjustment ring 3, effective improvements such as prevention of misalignment of the focus adjustment ring 3f and improvement of operability, which cannot be ignored as a problem, can be achieved, and the adjustment ring fixing mechanism Mc can be used. Since it can be similarly applied to the zoom adjustment ring and the iris adjustment ring, it can contribute to the improvement of the added value of the entire lens device 1 and the improvement of the commercial value.

Next, a modified example of the adjustment ring fixing mechanism Mc provided in the lens device 1 according to the present embodiment will be described with reference to FIGS. 8 and 9 (FIG. 3).

FIG. 8 shows an example of modification of the displacement regulating unit 7 constituting the adjusting ring fixing mechanism Mc. The displacement regulating unit 7 shown in FIGS. 1 to 4 shows a case where the engaging pin 12p, which is a separately prepared component, is attached to the hole 35 when the engagement regulating unit 12 is provided. The joint regulation portion 12 may be integrally formed as a protrusion 12e on the outer peripheral surface 2f of the fixed cylinder portion 2 as in the modified example shown in FIG.

On the other hand, FIG. 9 shows an example of modification of the intermediate ring portion 6 constituting the adjusting ring fixing mechanism Mc. The intermediate ring portion 6 shown in FIGS. 1 to 4 is shown in a case where the intermediate ring portion 6 is integrally formed of a hard material such as a metal material. However, the intermediate ring portion 6 is shown in FIGS. 1 to 9 as in the modified example shown in FIG. The intermediate ring portion 6 shown in FIG. 4 is an intermediate ring main body portion 6 m, and a constant thickness formed of an elastic material such as a rubber material on the surface of the intermediate ring main body portion 6 m facing the facing surface 5c of the pressing ring portion 5. It is also possible to attach the ring sheet 41 of the above, and further attach a ring plate 42 formed of a metal material to the ring sheet 41.

Since the intermediate ring portion 6 shown in FIG. 9 is elastically compressed when pressed in the optical axis direction Fc, the rotational displacement of the pressing ring portion 5 can be prevented by the pressing force due to the repulsion thereof. Therefore, the ring sheet 41 also serves as the ring lock portion 8. The position of the pressing ring portion 5 can be locked more firmly by using it in combination with the lock screw 13 shown in FIGS. 1 to 4, but in the case of the modified example of FIG. 9, other lock screw 13 and the like are not necessarily used. It is not necessary to provide fixing means.

In addition, the adjustment ring fixing mechanism Mc shown in FIGS. 1 to 4 is shown in the case where it is provided at one place in the circumferential direction Ff, but for example, it is similarly configured at two positions facing each other by 180 ° in the circumferential direction Ff. The adjusting ring fixing mechanism Mc ... May be provided. In this case, as shown in FIG. 3, in addition to providing the straight slit 11, the engagement restricting portion 12 and the lock screw 13 at one place, only the lock screw 13se shown by the virtual line is added at the position facing 180 °. It may be provided in a total of two sets of the same adjustment ring fixing mechanism Mc at two positions, and the like may be implemented in various forms. By providing a plurality of adjusting ring fixing mechanisms Mc, the balance of the lock position can be ensured, so that it is possible to avoid a problem that unnecessary stress is applied and to further increase the lock strength.

Although the preferred embodiment including the modified example has been described in detail above, the present invention is not limited to such an embodiment, and the gist of the present invention is described in terms of detailed configuration, shape, material, quantity, and the like. It can be changed, added, or deleted as long as it does not deviate.

For example, the positions and shapes of the facing surface 3c provided on the focus adjusting ring 3f (adjusting ring 3) and the facing surface 5c provided on the pressing ring portion 5 are not limited to examples, and other positions and various shapes can be selected. Is. Further, the intermediate ring portion 6 shows an example in which the entire intermediate ring portion 6 is formed of a hard material and an example in which a hard material is arranged on both sides. However, if at least a portion where displacement in the circumferential direction is restricted is formed of the hard material. Sufficient. Further, when forming the displacement regulating portion 7, a straight slit 11 parallel to the optical axis direction Fc is formed on the inner peripheral surface 6i in the intermediate ring portion 6, and the straight slit 11 is formed from the outer peripheral surface 2f of the fixed cylinder portion 2. Although the configuration for engaging with the protruding engagement restricting portion 12 is shown, the linear slit 11 and the engagement restricting portion 12 may be interchanged. That is, the engagement restricting portion 12 may be provided on the intermediate ring portion 6 and the straight slit 11 may be provided on the outer peripheral surface 2f of the fixed cylinder portion 2, and at least the intermediate ring portion 6 may be provided with respect to the fixed cylinder portion 2. It suffices to have a function that allows displacement in the optical axis direction Fc and regulates displacement in the circumferential direction Ff. The engagement restricting portion 12 is preferably an engaging pin 12p having a circular cross section, but various shapes such as a polygon and an ellipse can be applied to the cross section. On the other hand, although the case where the lock screw 13 is used as the ring lock portion 8 is shown, various configurations can be adopted as long as it has a function of locking the position of the pressing ring portion 5 with respect to the fixed cylinder portion 2, and as in the modified example, It is not always necessary to provide it.

The lens device according to the present invention can be used for various optical devices such as a camera and a telescope, as well as an illustrated projector, and can be used for various purposes regardless of household devices and commercial devices.

1: Lens device, 2: Fixed cylinder part, 2f: Outer peripheral surface of fixed cylinder part, 3: Adjustment ring, 3c: Opposed surface, 3f: Focus adjustment ring, 4: Screw part, 5: Pressing ring part, 5c : Opposing surface, 5m: Peripheral surface of pressing ring, 5i: Inner peripheral surface of pressing ring, 6: Intermediate ring, 6i: Inner peripheral surface of intermediate ring, 7: Displacement regulating, 8: Ring lock , 11: Straight slit, 12: Engagement restricting part, 12p: Engagement pin, 13: Lock screw, 13s: Lock screw tip, Fd: Radial direction, Ff: Circumferential direction, Fc: Optical axis direction, S: Lens mirror Cylinder, Mc: Adjustment ring fixing mechanism

Claims (6)

In a lens device including a lens barrel having an adjustment ring capable of rotating in the circumferential direction with respect to the fixed cylinder portion, the fixed cylinder portion is mounted so as to be rotatable in the circumferential direction via a screw portion. Then, the pressing ring portion forming the facing surface facing the facing surface in the adjusting ring, the intermediate ring portion interposed between the facing surface and the facing surface, and the optical axis direction of the intermediate ring portion. It is provided with an adjusting ring fixing mechanism having a displacement regulating portion that allows displacement to the lens and regulates displacement in the circumferential direction, and a ring locking portion that locks the position of the pressing ring portion with respect to the fixing cylinder portion. A lens device characterized by this. The lens device according to claim 1, wherein the adjustment ring includes one or more of a focus adjustment ring, a zoom adjustment ring, and an iris adjustment ring. The lens device according to claim 1, wherein the intermediate ring portion is formed of a hard material at least in a portion where displacement in the circumferential direction is restricted. The displacement restricting portion is formed on one of the inner peripheral surface of the intermediate ring portion or the outer peripheral surface of the fixed cylinder portion and is parallel to the optical axis direction, and protrudes from the other and engages with the straight slit. The lens device according to claim 1 or 3, further comprising an engagement restricting portion. The lens device according to claim 4, wherein the engagement restricting portion includes an engagement pin having a circular cross section. The ring lock portion includes a lock screw that is screwed in the radial direction of the peripheral surface portion of the pressing ring portion so that the tip portion exposed from the inner peripheral surface of the peripheral surface portion can be brought into contact with the fixed cylinder portion by a rotation operation. The lens device according to claim 1, wherein the lens device is characterized by the above.

Images