JPH0886950A - Focus demand - Google Patents

Abstract

PURPOSE: To achieve both of quick operation and fine focusing. CONSTITUTION: A main body 21 is provided with an operation ring for coarse adjustment 45 and an operation ring for fine adjustment 49. The rotation of the ring 49 is directly transmitted to a main gear 38 coupled to a potentiometer 22 and the rotation of the rings 45 is transmitted to the gear 38 through an idle gear 34 and an idle gear 35. Then, since the rotation ratio of the ring 45 and the ring 49 are different from each other, both of coarse adjustment and fine adjustment are executed by rotating either of them. Besides, a C-shaped thrust groove 25c is formed on a rotation ring 25. By engaging a stopper shaft 29 fixed to the main body 21 with the groove 25c, the rotation of the ring 25 is stopped and a mechanical terminating end can be constituted when a photographing lens arrives at a shortest distance or infinity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focus demand device for remotely controlling the focus of a taking lens of a TV camera.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view of a conventional focus demand, in which a multi-rotation potentiometer 2 having a linear electric characteristic is not detached in an axial direction by a fixing member 3 and a screw 4. Is installed as.
A rotating ring 5 is fitted on the outer periphery of the main body 1, and a holding plate 6 for sandwiching the flange portion 1a of the main body 1 in the rotating ring 5.
By being fixed with screws 7, the rotating ring 5 can be rotated around the main body 1 without coming off. A hole 6a is formed in the center of the pressing plate 6, and an input shaft 2a formed at the tip of the potentiometer 2 penetrates the hole 6a.

Further, the input shaft 2a of the potentiometer 2 is inserted into the inner diameter portion of the rotating ring 5 via a rubber joint 8, and the frictional force between the rotating ring 5 and the rubber joint 8 and the rubber joint 8 and the input shaft are inserted. Due to the frictional force between the potentiometer 2 and the rotary ring 5a, the rotation of the rotary ring 5 is 1: 1.
Is transmitted to the input shaft 2a.

A ball guide 9 is fixed by screws 10 on the surface of the rotary ring 5 facing the main body 1, and a vertical groove 9a is formed in the ball guide 9 in the radial direction with respect to the rotation axis of the potentiometer 2. There is. On the other hand, a spiral groove 1b is formed on the surface of the main body 1 facing the rotary ring 5, and a steel ball 11 is interposed between the groove 1b and the vertical groove 9a of the ball guide 9.

A tightening ring 12 is provided around a male screw 5a formed on the outer peripheral portion of the rotary ring 5, and the rotary ring 5 is further provided.
And two O-rings 13 on the outer periphery of the tightening ring 12,
14 are provided around each. An operating ring 15 is provided on the outer peripheral portions of the rotary ring 5 and the O-rings 13 and 14, and a protruding portion 15a formed on the inner diameter of the operating ring 15 is sandwiched between the two O-rings 13 and 14. The operating ring 15 can transmit its rotational force to the rotating ring 5 through the O-rings 13 and 14, and the operating ring 15 can be arranged so as to be
It is designed so that it does not come off from 4.

When the photographer focuses on the subject, first, the operation ring 15 is rotated clockwise or counterclockwise, and the operation ring 15 is rotated by frictional force to the O-rings 13, 14 and the tightening rings. It is transmitted to the rotating ring 5 via 12, and this rotation is further transmitted to the rotating ring 5.
The frictional force generated between the rubber joint 8 and the rubber joint 8 is transmitted to the input shaft 2a of the potentiometer 2. As the input shaft 2a of the potentiometer 2 rotates, the potentiometer 2
Is transmitted to a focus drive circuit (not shown), and a focus drive mechanism (not shown) adjusts the focus of the photographing lens to the object according to a command signal from the focus drive circuit.

As the rotary ring 5 rotates, the steel balls 11 move along the vertical grooves 9a of the ball guide 9 and the grooves 1b of the main body 1, and the steel balls 11 reach the ends of the grooves 1b of the main body 1. When the collision occurs, the rotation of the rotating ring 5 stops. At this time, since the cameraman continues to rotate the operation ring 15, the operation ring 15 rotates while sliding on the O-rings 13 and 14. As a result, the steel ball 11 becomes the groove 1 of the main body 1.
When the vehicle collides with the end of b, the cameraman is prevented from receiving the impact force, and at the same time, the impact sound is reduced.

In such focusing, depending on the cameraman, a position rotated by θ degrees from the mechanical end where the steel ball 11 collides with the end of the groove 1b of the main body 1 is the object distance X.
Since it may be necessary to remember in advance that it corresponds to a meter and to intentionally collide with the mechanical end and then rotate the operating ring 15 in the opposite direction, the presence or absence of the mechanical end is very convenient. Has become important.

[0009]

However, in the above-mentioned conventional example, as shown in FIG. 7, the electric characteristics of the potentiometer 2 are linear, and the rotation of the operating ring 15 is 1: 1 so that the input of the potentiometer 2 is increased. Since it is transmitted to the shaft 2a, for example, in the focus demand in which the spiral groove 1b of the main body 1 is a one-turn type, a quick operation can be performed when moving the entire focus range from infinity to the close range. However, when the depth of field is shallow, the sensitivity of the potentiometer 2 is high, and delicate focusing cannot be performed unless the focus demand rotation operation is performed accurately. On the contrary, fine adjustment is possible in the focus demand of 2 to 3 rotation type, but there is a problem that the operation takes time.

As a means for compensating for such a problem, it is conceivable to change the inclination of the output characteristic of the potentiometer 2 to change the sensitivity. However, as shown in FIG. 8, the focusing range is from the close range to the infinite range. In some cases, the mechanical end cannot be set, or the mechanical end does not reach the mechanical end due to an insufficient rotation angle, and the mechanical end does not serve as an index for the cameraman's operation. Also, even if you can change the electrical characteristics satisfactorily,
Since the electric circuit becomes complicated, there are problems that the device becomes large and the cost increases.

An object of the present invention is to solve the above problems,
After completely satisfying the conditions in the focusing range and rotation angle,
It is an object of the present invention to provide a focus demand capable of performing a quick operation without deteriorating the size or cost of the device as compared with a conventional product and further enabling delicate focusing at an arbitrary position in the operation range.

[0012]

A focus demand according to the present invention for achieving the above object corresponds to a rotation amount in a servo control focus demand for performing a focusing operation of a photographing lens by rotation of an operation ring. One electric signal output means for outputting a position signal, at least two transmission means for transmitting the rotational movement of the operation ring to the electric signal output means, and a focusing position of the photographing lens by operating the operation ring. And a rotation stop means for stopping the rotation of the electric signal output means when the position reaches a position close to or at infinity.

[0013]

With the focus demand having the above-mentioned structure, the rotational movement of the operating ring is transmitted to the electric signal output means via one of at least two transmission means, and the electric signal output means is moved to the input rotational position. When the focusing position of the shooting lens is reached by the rotation operation of the operating ring by outputting a position signal in accordance with it, and the focusing position of the shooting lens reaches the closest or infinity position, the mechanical end will cause an electrical error. The rotation of the signal output means is stopped.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a configuration diagram of the first embodiment, in which a multi-rotation type potentiometer 22 having a linear electric characteristic is attached to a main body 21 by a fixing member 23 and a screw 24 so as not to come off in the axial direction. ing. A rotating ring 25 is fitted around the outer periphery of the main body 21, and a fitting window portion 25a and a radial groove 25b are formed in the fitting portion of the rotating ring 25, as shown in FIG. On the other hand, in the fitting portion of the main body 21 with the rotating ring 25,
A ring-shaped top 26 is fixed at several points by screws 27. The top 26 engages with the radial groove 25a of the rotary ring 25 as shown in FIG. It is possible to rotate smoothly without coming off from 21. A decorative lid 28 is adhesively fixed to the window 25b of the rotating ring 25,
The inside of the rotating ring 25 is made invisible.

Further, a C-shaped thrust groove 25c having both ends is formed on the surface of the rotary ring 25 facing the main body 21, and the main body 21 has the thrust groove 25c.
The stopper ring 29, which has the rubber 29a for noise reduction attached to the outer peripheral portion so as to be engaged with c, is fixed by means such as tightening, whereby the rotary ring 25 rotates and the thrust groove 2
When the end of 5c collides with the stopper shaft 29, the rotary ring 25 stops.

The rotating ring 25 has an internal gear 30 and a screw 31.
Idler shaft 3 fixed by the main body 21
The idle gears 34 and 35 are rotatably provided around the gears 2 and 33, respectively, and the internal gear 30 and the idle gears 34 and 35 are sequentially meshed with each other, whereby the internal gear 3
The rotation of 0 is transmitted to the idle gear 35. The idle gears 34 and 35 are retaining rings 36 and 37.
Thus, the idler shafts 32 and 33 are respectively supported so as not to be disengaged in the axial direction. Further, a main gear 38 meshed with an idle gear 35 is rotatably provided inside the rotary ring 25, and a fixing plate 39 for sandwiching the flange portion 21a of the main body 21 is fixed to the main gear 38 by a screw 40. By being fixed, the main gear 38 becomes the main body 2
It is designed so as not to deviate from 1.

A hole 39a is formed in the center of the fixed plate 39, and an input shaft 22a formed at the tip of the potentiometer 22 is inserted through the hole 39a. Furthermore,
The input shaft 22a of the potentiometer 22 is inserted into the inner diameter portion of the main gear 38 via a coupling 41, and the main gear 3
8 and the coupling 41 and the frictional force between the coupling 41 and the input shaft 22a of the potentiometer 22 cause the main gear 38 to rotate to the input shaft 22a of the potentiometer 22 at a rotation ratio of 1: 1. It is being transmitted.

On the other hand, a tightening ring 42 is provided around the male screw 25d formed on the outer peripheral portion of the rotating ring 25, and two O-rings 43 are provided on the outer peripheral portions of the rotating ring 25 and the tightening ring 42. 44 are provided around each. Also,
A coarse adjustment operation ring 45 is provided on the outer peripheral portions of the O-rings 43 and 44.
The ring-shaped protruding portion 45a formed on the inner diameter portion of the is arranged so as to be sandwiched between the two O-rings 43 and 44, so that the rough adjustment operation ring 45 can change its rotational force by frictional force. It can be transmitted to the rotary ring 25 through the O-rings 43 and 44, and the rough-adjustment operation ring 45 is used as the O-ring 4.
3, so that it does not come off from the O-ring 44.

Similarly, a tightening ring 46 is provided around the male screw 38a formed on the outer peripheral portion of the main gear 38, and two O-rings 47 are provided on the outer peripheral portions of the main gear 38 and the tightening ring 46. 48 are provided around each. Further, the fine adjustment operation ring 49 is provided on the outer peripheral portions of the O-rings 47 and 48.
Is provided, and the annular protrusion 49a formed on the inner diameter portion of the fine adjustment operation ring 49 is arranged so as to be sandwiched between the two O-rings 47, 48. The operation ring 49 can transmit its rotational force to the main gear 38 via the O-rings 47 and 48 by frictional force, and the fine adjustment operation ring 49 is prevented from coming off from the O-rings 47 and 48.

When focusing on a subject, the photographer first rotates the coarse adjustment operating ring 45 by an approximate angle corresponding to the subject distance to be adjusted. The rotational force of the rough adjustment operation ring 45 is transmitted to the rotary ring 25 via the O-rings 43 and 44 and the tightening ring 42, and further, from the internal gear 30 to the two idle gears 34 and 35 in sequence to the main gear. 38. When the main gear 38 rotates,
The rotational force is transmitted to the input shaft 22a of the potentiometer 22 by the frictional force between the main gear 38 and the coupling 41, and the output signal thereof is transmitted to the focus drive circuit as the potentiometer 22 rotates. The focus drive mechanism focuses the photographic lens on the subject according to the command signal. At this time, the main gear 38 is rotated by the tightening ring 46, the O-rings 47, 48.
It is also transmitted to the fine adjustment operation ring 49 via the, and the fine adjustment operation ring 49 rotates N times faster than the coarse adjustment operation ring 45 due to the rotation ratio N between the internal gear 30 and the main gear 38.

When the rough adjustment operation ring 45 is in focus to a certain extent, the cameraman then rotates the fine adjustment operation ring 49 to accurately adjust the focus. At this time, the rotational force of the fine adjustment operation ring 49 is transmitted to the coarse adjustment operation ring 45 through a route opposite to that at the time of coarse adjustment, and this rotation is transmitted to the main gear 38,
It is transmitted to the input shaft 22a of the potentiometer 22 via the coupling 41, and the focus is adjusted in the same manner as during the coarse adjustment.

In a normal multi-rotation type focus demand, the maximum rotation angle of the operation ring is often 2.5 to 3 rotations. In order to make it equal to this, the maximum rotation of the fine adjustment operation ring 49 is required. The corners may be the same as conventional ones. Further, in this case, if the rotation ratio N between the coarse adjustment operation ring 45 and the fine adjustment operation ring 49 is set to, for example, about 5, the maximum rotation angle of the coarse adjustment operation ring 45 can be set to one rotation or less. , The thrust ring 25c is formed in the rotary ring 25 by the maximum rotation angle of the rough adjustment operation ring 45,
By restricting the movement of both ends of the thrust groove 25c by the stopper shaft 29, the maximum rotation angles of the coarse adjustment operation ring 45 and the fine adjustment operation ring 49 can be freely set.

When the end of the thrust groove 25c collides with the stopper shaft 29 as the rotating ring 25 rotates, the rotating ring 25 stops rotating. At this time, the cameraman operates the coarse adjustment operation ring 45 or the fine adjustment operation ring 4.
Since the rotation operation of 9 continues, the operation ring for coarse adjustment 4
5, the operation ring 49 for fine adjustment is the O-rings 43, 44, 4
It rotates while sliding with 7, 48. As a result, even if the stopper shaft 29 collides with the end of the thrust groove 25c of the rotary ring 25, the cameraman is prevented from receiving the impact force, and at the same time, the impact sound is reduced.

FIG. 3 is a block diagram of the second embodiment. A multi-rotation type potentiometer 52 having a linear electric characteristic is attached to a main body 51 by a fixing metal fitting 53 and a screw 54 so as not to come off in the axial direction. Is attached to. Body 5
A rotating ring 55 is fitted around the outer circumference of 1. The rotating ring 55 is smoothly rotated without being disengaged from the main body 51 by a top 57 having a shape in which a ring fixed at several points is cut. You can do it. A C-shaped thrust groove 55a having both ends is formed on the surface of the rotating ring 55 facing the main body 51.
The main body 51 is engaged with the thrust groove 55a,
Stopper shaft 5 with rubber 58a for noise reduction attached to the outer periphery
By fixing 8 by means such as tightening, when the rotating ring 55 rotates and the end of the thrust groove 55a collides with the stopper shaft 58, the rotating ring 55 stops.

A coarse adjustment gear 59 whose outer peripheral portion is a gear is fixed to the rotating ring 55 by means of screws 60, so that the rotating ring 55 and the coarse adjustment gear 59 rotate integrally. On the other hand, an idler shaft 61 fixed to the main body 51 is provided with an idle gear 62 composed of a large-diameter gear 62a and a small-diameter gear 62b so as to be rotatable by a retaining ring 63 so as not to come off in the axial direction. The rough adjustment gear 59 is meshed with the small diameter gear 62b of the idle gear 62. The main gear 6 in which the gear 64a is formed in a part of the outer peripheral portion in the inner diameter portion of the rotating ring 55 and the coarse adjustment gear 59.
4 is rotatably provided, and a gear 64a of the main gear 64 is provided.
A large-diameter gear 62a of the idle gear 62 is meshed with this.

The main gear 64 includes a franchise portion 5 of the main body 51.
The fixing plate 65 sandwiching 1a is fixed by the screw 66, so that the main gear 64 does not come off from the main body 51. In addition, a hole 65 is formed in the center of the fixing plate 65.
a is formed, and the potentiometer 52 is provided in the hole 65a.
The input shaft 52a formed at the tip of the is inserted. Further, the input shaft 52a of the potentiometer 52 is inserted into the inner diameter portion of the main gear 64 via the coupling 67, and the frictional force between the main gear 64 and the coupling 67 and the input shaft 52a of the coupling 67 and the potentiometer 52 are inserted. Due to the frictional force between and, the rotation of the main gear 64 is transmitted to the input shaft 52a of the potentiometer 52 at a rotation ratio of 1: 1.

A tightening ring 68 is provided around the male screw 55b formed on the outer circumference of the rotating ring 55, and two O-rings 69 and 70 are provided around the outer circumference of the rotating ring 55 and the tightening ring 68. It is set up. Further, a coarse adjustment operation ring 71 is provided on the outer peripheral portions of the O-rings 69 and 70, and an annular protrusion 71a formed on the inner diameter portion of the coarse adjustment operation ring 71 has two O-rings. Rings 69, 7
By being arranged so as to be sandwiched between 0, the rough adjustment operation ring 71 can transmit the rotational force to the rotary ring 55 via the O-rings 69 and 70 by frictional force, and at the same time from the O-rings 69 and 70. It is designed not to come off.

Male screw 6 formed on the outer periphery of main gear 64
A fastening ring 72 is provided around 4a, and two O-rings 73, 7 are provided on the outer periphery of the main gear 64 and the fastening ring 72.
4 are provided around each. Further, a fine adjustment operation ring 75 is provided on the outer peripheral portions of these O-rings 73 and 74, and an annular protruding portion 75a formed on the inner diameter portion of the fine adjustment operation ring 75 has two O-rings. Rings 73, 7
Since the fine adjustment operation ring 75 is arranged so as to be sandwiched between the O-ring 7 and the O-ring 7.
It can be transmitted to the main gear 64 via 3, 74, and the fine adjustment operation ring 75 is prevented from coming off from the O-rings 73, 74. Furthermore, the fine adjustment operation ring 75
An opening 7 is provided on the side surface of the opening for facilitating internal adjustment.
5b is formed, and this opening 75b is normally covered with a lid 77 fixed by a screw 76.

When focusing on a subject, the cameraman first rotates the rough adjustment operation ring 71 by an approximate angle corresponding to the subject distance to be adjusted. The rotational force of the coarse adjustment operation ring 71 is transmitted to the rotary ring 55 via the O-rings 69, 70 and the tightening ring 68, and further, from the coarse adjustment gear 59 via the idle gear 62 to the main gear 64.
Is transmitted to When the main gear 64 rotates, the rotation is transmitted to the input shaft 52a of the potentiometer 52 by the frictional force between the main gear 64 and the coupling 67, and the output signal thereof is transmitted to the focus drive circuit as the potentiometer 52 rotates. Then, according to the command signal from the focus drive circuit, the focus drive mechanism focuses the photographing lens on the subject. At this time, the rotation of the main gear 64 is also transmitted to the fine adjustment operation ring 75 via the tightening ring 72 and the O-rings 73 and 74, and the fine adjustment operation ring 75 rotates faster than the coarse adjustment operation ring 71.

When the rough adjustment operation ring 71 is in focus to a certain extent, the cameraman then rotates the fine adjustment operation ring 75 to accurately adjust the focus. At this time, the rotational force of the fine adjustment operation ring 75 is transmitted to the coarse adjustment operation ring 71 through a route opposite to that at the time of fine adjustment, and this rotation is transmitted to the main gear 64,
It is transmitted to the input shaft 52a of the potentiometer 52 via the coupling 67, and the focus is adjusted in the same manner as during the rough adjustment.

For example, assuming that the number of rotations of the fine adjustment operation ring 75 is three, if the rotation ratio N from the main gear 64 to the coarse adjustment operation ring 71 via the idle gear 62 is set to 5, the coarse adjustment operation ring is set. Since the rotation speed of 71 and the rotation ring 55 is 0.6 rotation, if the angle of the thrust groove 55a of the rotation ring 55 is set to 0.6 rotation, the stopper shaft 58 mechanically terminates the same as in the first embodiment. Can be configured.

FIG. 4 is a block diagram of a modification of the second embodiment. In the second embodiment, the coarse adjustment gear 59 and the idle gear 6 are used.
2. Rotational force was transmitted by gears like the main gear 64, but in this modified train, the rotation of the rotary ring 55 is transmitted to the main gear 64 by the pressure contact rollers 81 to 83 instead of these gears. There is. As a result, it is possible to eliminate a delay in response due to backlash that occurs in the reduction gear train.

FIG. 5 is a block diagram of the third embodiment.
The same reference numerals as in FIG. Face gears 71b and 75c are formed on the outer peripheral portions of the rough adjustment operation ring 71 and the fine adjustment operation ring 75 so as to face each other, and are moved in the axial direction so as to be able to mesh with these face gears 71b and 75c. A possible double-sided face gear 91 is provided. A shaft 92, a nut 93, and a clutch plate 94 are sequentially connected to the double-sided face gear 91, and these can be integrally moved.

On the other hand, the operation ring 95 is provided on the outer periphery of the main body 51.
Are rotatably fitted together. A push button 96 is connected to the clutch plate 94, and the push button 96 is inserted through the central portion of the operation ring 95 and protrudes to the outside. Further, the operation ring 95 is provided with a compression coil spring 97 for urging the push button 96 in the outward direction, and these members constitute a kind of clutch mechanism.

In a normal state, the compression coil spring 9
Since 7 pushes the push button 96, the double-sided face gear 91 connected to the push button 96 is meshed with the face gear 75c of the fine adjustment operation ring 75. That is, in this state, the operation ring 95 is in the fine adjustment mode, and when the operation ring 95 is manually rotated, this rotational force is transmitted to the main gear 64 via the fine adjustment operation ring 75.

When performing a rough adjustment, the cameraman pushes the push button 96 with his palm or the like, and the double-sided face gear 91 is meshed with the face gear 71b of the coarse adjustment operation ring 71 as shown in the upper portion of FIG. By rotating the operation ring 95 in this state, this rotation is transmitted to the main gear 64 via the rotary ring 55, the coarse adjustment gear 59, and the idle gear 62, and as a result, the main gear 64 is slower than the fine adjustment mode described above. In order to rotate at speed, the coarse adjustment mode can be activated. In this way, both the coarse adjustment and the fine adjustment can be performed by the single operation ring 95.

In the first to third embodiments, the multi-rotation type potentiometer is used, but it goes without saying that a single-rotation type potentiometer can have the same structure.

[0038]

As described above, in the focus demand according to the present invention, for example, when the operation range of the focus demand is wide and the movement stroke of the focus is long, the operation ring is quickly rotated, and when the depth of field is shallow. Can rotate the operating ring slightly to focus.
Further, since the mechanical end can be set, it is possible for the photographer to intentionally rotate the operation ring to the mechanical end and then return it to the stored position to focus.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a perspective view of a fitting portion between a main body and a rotating ring.

FIG. 3 is a sectional view of a second embodiment.

FIG. 4 is a sectional view of a modification of the second embodiment.

FIG. 5 is a cross-sectional view of a third embodiment in which the operating state is different between the upper portion and the lower portion.

FIG. 6 is a cross-sectional view of a conventional focus mand.

FIG. 7 is a graph showing an electric output characteristic of the potentiometer.

FIG. 8 is an explanatory diagram when the electrical characteristics of the potentiometer are changed.

[Explanation of symbols]

21, 51 Main body 22, 52 Potentiometer 25, 55 Rotating ring 29, 58 Stopper shaft 30 Internal gear 32, 33, 61 Idler shaft 34, 35, 62 Idle gear 38, 64 Main gear 41, 67 Coupling 42, 46, 68 , 72 Tightening rings 43, 44, 47, 48, 69, 70, 73, 74 O
Rings 45, 71 Coarse adjustment operation ring 49, 75 Fine adjustment operation ring 60 Coarse adjustment gear 91 Two-sided face gear 94 Clutch plate 95 Operation ring

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03B 13/34

Claims (3)

[Claims] 1. A position signal corresponding to a rotation amount is output in a focus demand for servo control for performing a focusing operation of a photographing lens by rotating an operation ring.
A plurality of electric signal output means, at least two transmission means for transmitting the rotational movement of the operation ring to the electric signal output means, and a focusing position of the photographing lens located close to or at infinity by the operation of the operation ring. A focus demand, comprising: rotation stop means for stopping the rotation of the electric signal output means when the position is reached. 2. At least two operation rings having different rotation angle ratios are provided, and a rotational motion input by any one of the at least two operation rings is provided by any one of the at least two transmission means. The focus demand according to claim 1, wherein the focus demand is input to the electric signal output means. 3. A switching means connected to any one of the at least two transmission means, wherein a rotary motion input by the operation ring is input to the electric signal output means via the transmission means connected by the switching means. The focus demand according to claim 1, wherein the focus demand is set.