JP2010014766A - Lens device and optical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate trouble with a shift of adjustment position (set position) of a turning cylindrical part, to dispense with troublesome readjustment works, to avoid viewing, or the like, at an improperly adjusted position, and to optimize operability and operation power, when turn operating the turning cylindrical part. <P>SOLUTION: When the lens device having a lens barrel 2, provided with the turning cylindrical part 4 turn-operable with respect to a fixed cylindrical part 3, is constituted, a torque setting member 5 capable of setting a turn-operation torque T, at least when operating to turn the turning cylindrical part 4 to a predetermined level, is held in between the fixed cylindrical part 3 and the turning cylindrical part 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens apparatus and an optical apparatus suitable for use in projectors and the like that are installed in various modes including a ceiling installation.

  In general, a projector is equipped with a lens device for projection, and this lens device is usually equipped with a rotating cylinder such as a zoom ring, a focus ring, an iris ring, etc. that can be manually rotated with respect to a fixed cylinder. The lens barrel is provided.

Conventionally, a lens barrel structure (lens device) disclosed in Patent Literature 1 is known as a lens device equipped with this type of lens barrel mounted on a projector. A lens device including a lens barrel having a zoom member (zoom ring) that can be manually rotated on a fixed member (fixed tube portion) is disclosed, and this type of lens barrel is usually a zoom lens. A cam ring member having a cam follower portion integrally formed with a moving part, or a cam ring member having a cam follower formed integrally with a mold part via a cam ring member having a cam lift and a fixed member having a straight groove. The point which comprises a cam structure with each moving group via the fixing member which has is disclosed.
JP 2003-202479 A

  However, the conventional lens device (lens barrel structure) described above has the following problems.

  As shown in FIG. 8, when the projector Mp is suspended from the ceiling 201 using the ceiling mount 101, the projector Mp is often installed with the projector Mp tilted forward and downward in a type not equipped with a lens shift mechanism. . In this case, since the lens device 102 is also tilted forward and downward, even if zoom adjustment is performed by the zoom ring 103 during initial installation, there is a problem in that the zoom position gradually shifts due to long-term use. Furthermore, depending on the usage mode, the projector Mp installed on the ceiling may be projected onto the floor surface. In this case, the problem becomes more prominent.

  In particular, the zoom ring 103 that is manually operated needs to ensure operability (operation feeling) and operation force during zooming adjustment, and therefore cannot be set to a very large rotational operation torque. Since a plurality of relatively heavy glass lenses are used, the weight of the lens cannot be ignored, and the initially adjusted zooming position is likely to be shifted due to long-term use or slight vibration. Once the zooming position has shifted, it is necessary to readjust the projector Mp that is suspended from the ceiling. At this time, it is troublesome because it must be readjusted on a platform or the like. In addition to being troublesome work, if the user does not notice a shift in the zooming position, viewing at a non-optimal zooming position is forced.

  The object of the present invention is to provide a lens apparatus and an optical apparatus that have solved the problems in the background art.

  In order to solve the above-described problem, the lens device 1 according to the present invention constitutes a lens device having a lens barrel 2 in which a rotating cylinder portion 4 that can be rotated with respect to the fixed cylinder portion 3 is mounted. At this time, a torque setting member 5 capable of setting a rotation operation torque T at a predetermined magnitude between at least the rotation cylinder portion 4 is interposed between the fixed cylinder portion 3 and the rotation cylinder portion 4. It is characterized by becoming.

  In this case, according to a preferred aspect of the invention, the torque setting member 5 can be composed of one or both of the elastic material Re and the friction material Rr. Further, the torque setting member 5 is formed between an end surface Ft of the rotating cylinder portion 4 (or the fixed cylinder portion 3) and a step surface Fs provided on the fixed cylinder portion 3 (or the rotating cylinder portion 4) facing the end surface Ft. Or the outer peripheral surface Fo of the rotating tube portion 4 (or the fixed tube portion 3) and the inner peripheral surface Fi of the fixed tube portion 3 (or the rotating tube portion 4) facing the outer peripheral surface Fo. You may interpose between. Further, the torque setting member 5 can be provided with torque adjusting means 6 capable of variably adjusting the magnitude of the rotation operation torque T. The rotating cylinder portion 4 can include one or more of a zoom ring 4z, a focus ring 4f, and an iris ring.

  On the other hand, the optical apparatus M according to the present invention uses such a lens device 1, and in particular, as the optical apparatus M, a projector that modulates and projects a luminous flux emitted from a light source unit according to image information. It is desirable to apply to Mp.

  According to the lens device 1 and the optical apparatus M according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) Even when the lens apparatus 1 (optical apparatus M) is installed with an inclination, the rotation cylinder torque T when the rotation cylinder 4 is rotated can be set large. The problem that the adjustment position (setting position) of the rotation cylinder portion 4 is shifted after the adjustment by the rotation operation 4 can be solved. Therefore, troublesome and troublesome readjustment work can be eliminated, and viewing at an inappropriate adjustment position can be avoided.

  (2) Since the rotational operation torque T when the rotational cylinder portion 4 is rotationally operated can be set to a predetermined magnitude, operability (operation feeling) when the rotational cylindrical portion 4 is rotationally operated, The operating force can be set to an optimum state.

  (3) If the torque setting member 5 is formed of one or both of the elastic material Re and the friction material Rr according to a preferred embodiment, the magnitude of the rotational operation torque T matched with the configuration, size, etc. of the lens device 1. This can be set arbitrarily and easily.

  (4) According to a preferred embodiment, the torque setting member 5 is provided on the end surface Ft of the rotating tube portion 4 (or the fixed tube portion 3) and the fixed tube portion 3 (or the rotating tube portion 4) facing the end surface Ft. If it is interposed between the stepped surfaces Fs, the configuration of the existing lens device can be used as it is or can be easily assembled by only a slight design change such as a size change.

  (5) According to a preferred embodiment, the torque setting member 5 is made of the outer peripheral surface Fo of the rotating cylinder portion 4 (or fixed cylinder portion 3) and the fixed cylinder portion 3 (or the rotating cylinder portion 4) opposed to the outer peripheral surface Fo. If it is interposed between the inner peripheral surfaces Fi, the torque setting member 5 can be easily provided with only a slight design change, and stress is generated in the axial direction of the rotating cylinder part 4 or the fixed cylinder part 3. It can be avoided.

  (6) Since the torque adjusting member 6 capable of variably adjusting the magnitude of the rotational operation torque T is attached to the torque setting member 5 according to a preferred embodiment, the magnitude of the rotational operation torque T can be arbitrarily adjusted. The operability (operation feeling) and operation force when rotating the rotating cylinder portion 4 can be freely adjusted (set) according to the user's preference and the like, which contributes to the improvement of user convenience. it can.

  (7) According to a preferred embodiment, if one or more of the zoom ring 4z, the focus ring 4f, and the iris ring are included in the rotating cylinder portion 4, it is possible to prevent the zoom ring 4z from being disregarded as a problem. In addition to improvements such as improvement, the same effect can be applied to the focus ring 4f and the iris ring, which can contribute to further increase in added value of the lens apparatus 1 (optical apparatus M).

  (8) If the lens apparatus 1 is used for the optical apparatus M, particularly the projector Mp, according to a preferred aspect, it is possible to eliminate a problem that an adjustment position such as a preset zooming position shifts when performing ceiling installation.

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

  First, the structure of the main part of the lens apparatus 1 according to the present embodiment will be described with reference to FIGS.

  FIG. 1 shows a lens apparatus 1 according to this embodiment. The lens apparatus 1 includes a lens barrel 2, and a plurality of lens groups Lf, La, Lb, Lc, and Lr are accommodated in the lens barrel 2. Each lens group Lf, La... Lr includes one or more lenses. The exemplary lens groups Lf... Lr are five groups, but the number of groups is arbitrary. The lens barrel 2 includes a fixed cylinder portion 3, and the fixed cylinder portion 3 includes an inner cylinder portion 3i and an outer cylinder portion 3o. In addition, this fixed cylinder part 3 is fixed in the exterior of the projector Mp (optical apparatus M) mentioned later. The inner cylinder part 3i projects forward from the front end of the outer cylinder part 3o, and the cam cylinder part 4c is rotatably accommodated inside the inner cylinder part 3i. A zoom ring 4z is rotatably mounted on the front portion of the outer peripheral surface of the inner cylinder portion 3i. The zoom ring 4z includes a zoom ring base 4zb that is rotatably mounted on the outer peripheral surface of the inner cylinder portion 3i, and a zoom ring body 4zm that is fixed to the outer peripheral edge of the zoom ring base 4zb. And the front part of the inner cylinder part 3i has the guide groove 23 (refer FIG. 2) formed along the circumferential direction, and via the roller member 24 accommodated in this guide groove 23, the zoom ring base 4zb and the cam cylinder The part 4c is joined. Thereby, if the zoom ring 4z is rotated, the cam cylinder 4c can be rotated integrally. Therefore, the cam cylinder portion 4 c including the zoom ring 4 z constitutes the rotation cylinder portion 4.

  Further, as shown in FIG. 2, the cylinder of the cam cylinder 4c has a plurality of cam grooves 12a ..., 12b ..., 12c ... formed along the spiral direction, and the cylinder of the inner cylinder 3i. Has straight grooves 13 formed along the front-rear direction (axial direction). In addition, a plurality of lens group frames 25a, 25b, 25c are accommodated in the cam cylinder portion 4c, projecting radially from the outer peripheral surface of each lens group frame 25a, and at 120 [°] intervals in the circumferential direction. The three (generally plural) roller members 26a ..., 26b ..., 26c ... arranged in the above-described cam grooves 12a ..., 12b ..., 12c ... of the cam cylinder portion 4c and the linear groove 13 of the inner cylinder portion 3i. Engage with each. Thereby, if the cam cylinder part 4c is rotated, each lens group frame 25a, 25b, 25c can be displaced in the front-back direction. The lens group frames 25a are assembled in the same manner, but the inclination angles of the cam grooves 12a corresponding to the lens group frames 25a are set to be the same or different. The above configuration is a basic zooming mechanism Uz.

  On the other hand, according to the present invention, the zooming mechanism Uz is provided with a torque setting member 5 that can set the rotation operation torque T when the zoom ring 4z (the rotation cylinder portion 4) is rotated to a predetermined magnitude. In other words, the torque setting member 5 is interposed between the fixed cylinder portion 3 and the rotation cylinder portion 4, thereby setting the rotation operation torque T when the zoom ring 4z is rotated to a predetermined magnitude. 3 and 4 show the torque setting member 5. As the torque setting member 5, a wave washer 5a integrally formed of an elastic material Re such as a metal material having a spring property or a synthetic resin material is used. As shown in FIG. 3, the wave washer 5a is formed in a ring shape as a whole, and as shown in FIG. 4, the wave washer 5a is formed in a waveform in which peaks and valleys bent at regular intervals in the circumferential direction are repeated. If the torque setting member 5 is made of such an elastic material Re, there is an advantage that the magnitude of the rotational operation torque T matched with the configuration and size of the lens device 1 can be arbitrarily and easily set.

  As shown in FIG. 1, the torque setting member 5 includes an end surface (rear end surface) Ft of the cam tube portion 4c (rotating tube portion 4) and an inner tube portion 3i (fixed tube portion 3) opposite to the end surface Ft. It is interposed between step surfaces Fs provided at the rear. Therefore, the outer diameter dimension of the torque setting member 5 is selected to be smaller than the outer diameter dimension of the cam tube portion 4c, and the inner diameter dimension of the torque setting member 5 is an optical path provided inside the lens barrel 2. It is desirable to select a dimension that is approximately the same as the inner diameter dimension of the stepped surface Fs that is a dimension that does not hinder. Further, since the torque setting member 5 has a function of setting the rotation operation torque T when rotating the rotation cylinder portion 4 to a predetermined magnitude, the rotation operation torque T when actually assembled. In addition to selecting the material, thickness, number of waveforms, forming angle, and the like when forming the wave washer 5a, if necessary, a friction material is added to the surface of the wave washer 5a. Add friction material by surface treatment or coating.

  By the way, between the end surface Ft of the cam tube portion 4c and the step surface Fs provided at the rear portion of the inner tube portion 3i facing the end surface Ft, the fixed tube portion 3 fixed and the rotation accommodated inside the fixed tube portion 3 are provided. Since the rotating cylindrical portion 4 that moves is between the end surfaces that are in sliding contact with each other, there is inherently a slight gap So. Therefore, when the gap So is large to some extent, the torque setting member 5 can be accommodated by using the gap So as it is, and even when the gap So is small, the axial dimension of the cam cylinder portion 4c is shortened. A space (gap So) for accommodating the torque setting member 5 can be easily secured only by forming. Thus, if the torque setting member 5 is interposed between the end surface Ft of the rotating tube portion 4 and the step surface Fs provided on the fixed tube portion 3 where the end surface Ft faces, the configuration of the existing lens device can be obtained. There is an advantage that it can be used as it is or can be easily assembled with only a slight design change such as a size change.

  On the other hand, the outer peripheral surface of the lens group frame 27 that holds the lens group Lf described above is screwed to the front portion of the inner peripheral surface of the inner cylindrical portion 3i, and the outer peripheral edge of the lens group frame 27 is manually engaged. The focus ring 4f (rotating cylinder part 4) to be rotated is fixed. Thus, when the focus ring 4f is rotated, the focusing mechanism Uf that can displace the lens group frame 27 holding the lens group Lf in the front-rear direction is configured, and the focusing adjustment in the lens apparatus 1 can be performed. .

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

  First, the wave washer 5a (torque setting member 5) described above can be assembled together when the inner cylinder part 3i (fixed cylinder part 3) and the cam cylinder part 4c (rotating cylinder part 4) are assembled. That is, as shown in FIG. 4, the wave washer 5a is accommodated in the inner cylinder portion 3i, and thereafter, the cam cylinder portion 4c can be easily assembled only by accommodating in the inner cylinder portion 3i. . The axial positions of the inner cylinder part 3i and the cam cylinder part 4c are regulated by the engagement of the circumferential guide groove 23 provided in the inner cylinder part 3i and the roller member 24 of the cam cylinder part 4c.

  On the other hand, the basic function of the zooming mechanism Us is as follows. If the zoom ring 4z is manually rotated, the rotation displacement of the zoom ring 4z is transmitted to the cam cylinder portion 4c via the zoom ring base 4zb and the roller member 24, and the cam cylinder portion 4c is integrally rotated and displaced. To do. Thus, the roller members 26a,..., 26b... Engage with the spiral cam grooves 12a... 12b. , 26c... Are displaced in the front-rear direction. Therefore, the lens group frames 25a, 25b, 25c integral with the roller members 26a, 26b, 26c,... Are displaced in the front-rear direction by rotating the zoom ring 4z, that is, the lens groups La, Lb, Lc are moved in the front-rear direction. Zooming adjustment can be performed.

  At this time, in the lens device 1 according to the present embodiment, the rotation operation torque T when the zoom ring 4z (the rotation cylinder portion 4) is rotated to the cam cylinder portion 4c and the inner cylinder portion 3i is a predetermined magnitude. Since the set wave washer 5a (torque setting member 5) is interposed, the operability (operation feeling) and operation force when the zoom ring 4z is manually rotated are in an optimal state. Even when the lens apparatus 1 is installed at an inclination, the rotation operation torque T when the rotation cylinder portion 4 is rotated can be set large. The problem that the adjustment position (setting position) of the rotating cylinder portion 4 is shifted after the adjustment can be solved. Therefore, troublesome and troublesome readjustment work can be eliminated, and viewing at an inappropriate adjustment position can be avoided.

  Next, a lens device 1 according to a modified embodiment of the present invention will be described with reference to FIGS.

  First, FIGS. 5A to 5C show modified examples of the torque setting member 5 in the lens apparatus 1 of the basic embodiment shown in FIGS. FIG. 5A shows a case where a coil spring 5b formed of an elastic material Re is used as the torque setting member 5, and can be easily implemented only by replacing the wave washer 5a shown in FIG. FIG. 5B shows a case where a rubber ring 5c formed of a rubber material which is an elastic material Re is used as the torque setting member 5. In this case as well, it is easy to replace the wave washer 5a shown in FIG. Can be implemented. FIG. 5C shows the torque setting member 5 using the friction material Rr and the torque setting member 5 provided with torque adjusting means 6 capable of variably adjusting the magnitude of the rotation operation torque T. It is. That is, a plurality of (three or four) screw hole portions 31 penetrating in the axial direction and equally spaced in the circumferential direction are provided in the step surface Fs of the inner cylindrical portion 3i, and the cam cylindrical portion is provided in the inner cylindrical portion 3i. After assembling 4c, a cylindrical block 5dr formed of the friction material Rr serving as the torque setting member 5 and a coil spring 5de formed of the elastic material Re are sequentially arranged from the outside with respect to the screw holes 31. Then, the adjustment screws 32 are screwed together. As a result, the blocks 5dr can be brought into pressure contact with the end surface Ft of the cam cylinder 4c, and the magnitude of the pressure contact force can be variably adjusted by the adjusting screws 32, that is, the magnitude of the rotational operation torque T can be variably adjusted. be able to. If such a torque adjusting means 6 is attached, the magnitude of the rotation operation torque T can be arbitrarily adjusted. Therefore, the operability (operation feeling) and operation force when the rotation cylinder portion 4 is rotated are reduced. It can be freely adjusted (set) according to the user's preferences and the like, and there is an advantage that it can contribute to the improvement of user convenience.

  On the other hand, FIGS. 6A to 6D show examples of changing the position (assembly position) where the torque setting member 5 is provided in the lens apparatus 1 of the basic embodiment shown in FIGS. 6 (a) to 6 (d), the torque setting member 5 is an inner part of the outer peripheral surface Fo of the cam cylinder part 4 c that becomes the rotating cylinder part 4 and the fixed cylinder part 3 opposite to the outer peripheral face Fo. It is interposed between the inner peripheral surface Fi of the cylinder part 3i. Accordingly, in all of FIGS. 6A to 6D, a clearance is formed between the outer peripheral surface Fo and the inner peripheral surface Fi by forming a cut-shaped concave portion over the entire periphery of the outer peripheral surface Fo of the cam cylinder portion 4 c. Sm was formed, and the torque setting member 5 was interposed in the gap Sm. FIG. 6A shows a case where a moquette sheet 5er formed of a moquette material that is a friction material Rr is used as the torque setting member 5, and the moquette sheet 5er is bonded and fixed on the outer peripheral surface Fo with an adhesive 5ec. FIG. 6B uses a rubber sheet 5f instead of the moquette sheet 5er shown in FIG. 6A. In this case, the outer peripheral surface Fo is provided with a concave groove portion 33 that holds the rubber sheet 5f. FIG. 6C uses a leaf spring 5g formed of an elastic material Re instead of the rubber sheet 5f shown in FIG. 6B. FIG. 6 (d) shows a plate spring portion 5h formed directly using a part of the fixed tube portion 3 (inner tube portion 3i). That is, in FIG. 6C, the leaf springs 5g formed separately from a metal material or the like are assembled, but FIG. 6D is integrated with a part of the fixed cylindrical portion 3 (inner cylindrical portion 3i). Formed. In each of FIGS. 6A to 6D, the torque setting member 5 is interposed between the outer peripheral surface Fo of the rotating cylindrical portion 4 and the inner peripheral surface Fi of the fixed cylindrical portion 3 opposed to the outer peripheral surface Fo. As in the embodiment shown in FIGS. 1 to 5 described above, the turning operation torque T when turning the turning cylinder portion 4 can be set to a predetermined magnitude. Further, in this case, there is an advantage that the torque setting member 5 can be easily provided with only a slight design change and the generation of stress in the axial direction of the rotating cylinder part 4 or the fixed cylinder part 3 can be avoided.

  On the other hand, FIGS. 7A and 7B change the position (assembly position) where the torque setting member 5 is provided in the lens apparatus 1 of the basic embodiment shown in FIGS. ) Shows a modification example in which torque adjusting means 6 capable of variably adjusting the magnitude of the rotation operation torque T is attached to the torque setting member 5 having the same function as in FIG. The basic configuration of the lens barrel 2 shown in FIGS. 7A and 7B is different from the configurations shown in FIGS. FIG. 7A has a configuration in which the rotating cylinder portion 4 is rotatably attached to the outer peripheral surface of the fixed cylinder portion 3. The front end part 3k of the fixed cylinder part 3 is projected forward from the end face (front end face) Ft of the rotating cylinder part 4, and a male screw part 3ks is formed on the outer peripheral surface of the front end part 3k. Then, the torque setting ring 5i is screwed into the male screw portion 3ks.

  Therefore, the female thread portion 5in is formed on the inner peripheral surface of the torque setting ring 5i. The torque setting ring 5i constitutes the torque setting member 5 and is integrally formed of the friction material Rr. Since the torque setting ring 5 i is screwed into the front end portion 3 k of the fixed cylinder portion 3, the torque setting ring 5 i also serves as the step surface Fs of the fixed cylinder portion 3. As a result, when the torque setting ring 5i is brought into contact with the end surface (front end surface) Ft of the rotating cylinder portion 4, the rotation operation torque T when the rotating cylinder portion 4 is rotated is set to a predetermined magnitude. Torque adjusting means that can be set and if the torque setting ring 5i is rotated, the torque setting ring 5i is displaced in the axial direction by the male screw portion 3ks and the female screw portion 5in, and the magnitude of the rotational operation torque T can be variably adjusted. 6 is configured. Reference numeral 41 denotes an operation unit for operating the torque setting ring 5i, which is integrally formed with the torque setting ring 5i. In this way, if the torque adjusting means 6 capable of variably adjusting the magnitude of the rotation operation torque T is attached to the torque setting ring 5i, the magnitude of the rotation operation torque T can be arbitrarily adjusted. The operability (operation feeling) and operation force when rotating the unit 4 can be freely adjusted (set) according to the user's preference and the like, and there is an advantage that it can contribute to the improvement of the user's convenience. . FIG. 7B shows an arrangement in which an elastic ring 5j formed of an elastic material Re is interposed between the torque setting ring 5i and the end face (front end face) Ft in the configuration of FIG. 7A. Therefore, in this case, the elastic ring 5j constitutes the torque setting member 5, and the torque setting ring 5i constitutes the step surface Fs. 5 to 7, the same parts (same function parts) as those in FIGS. 1 to 4 are denoted by the same reference numerals to clarify the configuration, and detailed description thereof is omitted.

  By the way, such a lens device 1 is optimal for use in a projector Mp (optical apparatus M) that modulates and projects a luminous flux emitted from a light source unit according to image information. That is, this type of projector Mp is often tilted and installed on the ceiling (see FIG. 8). At this time, the lens apparatus 1 according to the present embodiment is also tilted, and the plurality of lens groups La. Even if is added to the zooming mechanism Uz, it is possible to solve the problem that the zooming position of the preset (for example, initial setting) is shifted.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the scope of the present invention is not deviated from the gist of the present invention in the detailed configuration, shape, material, quantity, and the like. It can be changed, added, or deleted arbitrarily.

  For example, although the zoom ring 4z is illustrated as the rotation cylinder portion 4, it may be a focus ring 4f or an iris ring (not shown), and each rotation operation torque is configured by the same configuration as the zoom ring 4z. The size can be adjusted. As described above, in addition to the improvement of the prevention of the displacement and the operability improvement in the zoom ring 4z which cannot be ignored as a problem in particular, the same effect can be applied to the focus ring 4f and the iris ring. Contributes to further added value improvement. Further, as exemplified in the embodiment, the torque setting member 5 may be constituted by one of the elastic material Re or the friction material Rr, or may be constituted by both. Furthermore, as exemplified in the embodiment, the torque setting member 5 may be interposed between the end surface Ft of the rotating tube portion 4 and the step surface Fs provided on the fixed tube portion 3 facing the end surface Ft. And the form interposed between the step surface Fs provided in the rotation cylinder part 4 which this end surface Ft and this end surface Ft oppose may be sufficient. Similarly, the torque setting member 5 may be interposed between the outer peripheral surface Fo of the rotating cylindrical portion 4 and the inner peripheral surface Fi of the fixed cylindrical portion 3 opposed to the outer peripheral surface Fo. The form interposed between the outer peripheral surface Fo and the inner peripheral surface Fi of the rotation cylinder part 4 which this outer peripheral surface Fo opposes may be sufficient. The lens device 1 is optimally applied to the projector Mp as the optical device M, but can be used in the same manner for various other optical devices M such as a camera and a telescope. In this case, as the projector Mp, various types of projectors including a liquid crystal panel method can be applied.

Sectional side view of the lens device according to the best embodiment of the present invention, An exploded perspective view of the main part of the lens barrel in the lens device, Front view of wave washer (torque setting member) used for the lens device, Explanatory drawing of the assembly method of the wave washer (torque setting member) used for the lens device, Sectional side view which abbreviate | omitted some lens apparatuses which are the lens apparatuses which concern on the modified embodiment of this invention, and show the example of a change of a torque setting member, Sectional side view which abbreviate | omitted some lens apparatuses which are the lens apparatuses which concern on other modified embodiment of this invention, and show the example of a change of the position (assembly position) which provides a torque setting member, Sectional side view which abbreviate | omitted one part of the lens apparatus which shows the other modification of the position (assembly position) which is a lens apparatus which concerns on other modified embodiment of this invention, and provides a torque setting member, Side view of a projector (optical device) installed on a ceiling for explaining the background technology,

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1: Lens apparatus, 2: Lens barrel, 3: Fixed cylinder part, Fs: Step surface, Fi: Inner peripheral surface, 4: Rotating cylinder part, Ft: End surface, Fo: Outer peripheral surface, 4z: Zoom ring, 4f : Focus ring, 5: torque setting member, 6: torque adjusting means, Re: elastic material, Rr: friction material, M: optical device, Mp: projector

Claims (8)

  In a lens apparatus having a lens barrel that is provided with a rotation cylinder portion that can be rotated with respect to the fixed cylinder portion, at least the rotation cylinder portion is rotated between the fixed cylinder portion and the rotation cylinder portion. A lens device comprising a torque setting member capable of setting a rotational operation torque during a dynamic operation to a predetermined magnitude.   The lens device according to claim 1, wherein the torque setting member is made of one or both of an elastic material and a friction material.   The torque setting member is interposed between an end surface of the rotating cylinder part (or the fixed cylinder part) and a step surface provided on the fixed cylinder part (or the rotating cylinder part) facing the end surface. The lens apparatus according to claim 1, wherein:   The torque setting member is interposed between an outer peripheral surface of the rotating cylinder part (or the fixed cylinder part) and an inner peripheral surface of the fixed cylinder part (or the rotating cylinder part) facing the outer peripheral surface. The lens apparatus according to claim 1.   The lens device according to any one of claims 1 to 4, wherein the torque setting member is provided with torque adjusting means capable of variably adjusting the magnitude of the rotation operation torque.   The lens device according to claim 1, wherein the rotating cylinder portion includes one or more of a zoom ring, a focus ring, and an iris ring.   An optical apparatus comprising the lens device according to claim 1.   The optical apparatus according to claim 7, wherein the optical apparatus is a projector that modulates and projects a luminous flux emitted from a light source unit according to image information.

Images