JPH09196962A - Rotation detecting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation detecting mechanism wherein the pulse plane of a rotation pulse board is covered, without making it larger. SOLUTION: Over a rotation shaft holding member 20 wherein a rotation pulse board 14 is housed in a rotation pulse board housing groove 22, a pin reception member 40 is placed. Conductive pins 30, 32 and 34 are inserted into pin holes 46a, 46b and 46c of the pin reception member 40, and so that one ends 30a, 32a and 34a come into contact with a pulse plane 16, the other ends 30b, 32b and 34b are energized by springs 60, 62 and 64 of a spring fixing member 50. The rotation shaft supporting member 20, the pin reception member 40 and the spring fixing member 50 are, with the use of fixing screws 70 and 72, fixed in one body. The pulse plane 16 of the rotation pulse board 14 is covered with the rotation shaft folding member 20 and the pin reception member 40. A rotation detection mechanism 1 is not made larger in size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detecting mechanism, and more particularly to a rotation detecting mechanism for detecting rotation by bringing a conductive member into contact with a rotating rotation pulse plate.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG. 12, there is a rotation detecting mechanism 2 having a rotating rotation pulse plate 7 and a plurality of brushes 8a, 8b, 8c which are conductive members. The rotation pulse plate 7 of the rotation detecting mechanism 2 has a pulse surface 6 in which conductive portions 4 and insulating portions 5 extending radially are alternately arranged in the circumferential direction, and the brushes 8a and 8b have the pulse surface 6. A pulse signal is obtained by alternately contacting the conductive portion 4 and the insulating portion 5 of. The rotation pulse plate 7 of the rotation detection mechanism 2 is exposed to the outside. Therefore, if dust or dust adheres to the pulse surface 6 of the rotating pulse plate 7, the conductive portion 4 of the pulse surface 6 and the brushes 8a, 8b will be
In some cases, a contact failure may occur between and, a correct pulse signal may not be obtained, and rotation detection accuracy may deteriorate. In order to prevent this, it is conceivable that the rotation detection mechanism 2 is entirely covered with another member, but this requires a wide space. On the other hand, it is conceivable to cover only the rotary pulse plate 7, but in that case, the problem is how to bring the brushes 8a and 8b, which are conductive members, into contact with the pulse surface 6 of the rotary pulse plate 7. Becomes

[0003]

Therefore, the technical problem to be solved by the present invention is to provide a rotation detecting mechanism in which the pulse surface of the rotating pulse plate is covered without increasing the size.

[0004]

In order to solve the above technical problems, according to the present invention, there is provided a rotation detecting mechanism having the following configuration.

In the rotation detecting mechanism, a conductive member is in contact with the pulse surface of the rotation pulse plate. The rotation detection mechanism includes a rotation shaft holding member, a pin receiving member, and a spring fixing member.
The rotary shaft holding member supports the rotary shaft of the rotary pulse plate. The pin receiving member has a facing surface that closely faces and faces the entire pulse surface of the rotary pulse plate. The pin receiving member has a through hole that opens toward the pulse surface of the rotary pulse plate and penetrates in a direction substantially perpendicular to the pulse surface. A conductive pin is inserted into the through hole of the pin receiving member. One end of this conductive pin contacts the pulse surface of the rotary pulse plate, and the other end projects from the through hole of the pin receiving member. A conductive spring member is fixed to the spring fixing member. The conductive spring member contacts the other end of the conductive pin protruding from the through hole of the pin receiving member to bias the conductive pin to the pulse surface of the rotary pulse plate. The rotary shaft holding member, the pin receiving member, and the spring fixing member are integrally connected.

In the above structure, the rotation pulse plate is rotated by transmitting the rotation of the object to be detected. Conductive portions and insulating portions are alternately arranged in the rotation direction on the pulse surface of the rotating pulse plate. The conductive member contacts the pulse surface. The entire pulse surface of the rotary pulse plate is covered with the facing surface of the approaching pin receiving member. In other words, since the space between both surfaces is narrow, it is difficult for dust to enter. The conductive pin that is inserted into the through hole of the pin receiving member and contacts the pulse surface of the rotating pulse plate and the conductive spring member of the spring fixing member that abuts the conductive pin and biases the conductive pin toward the pulse surface are electrically connected to each other. To form a conductive member. Since the rotary shaft holding member, the pin receiving member and the spring fixing member are integrally fixed to each other, a wide space is not necessary.

Therefore, with the above structure, it is possible to provide a rotation detecting mechanism in which the pulse surface of the rotation pulse plate is covered without increasing the size.

In the above construction, the facing surface of the pin receiving member is close to the pulse surface of the rotary pulse plate in the axial direction, but a space communicating with the outside may be formed in the radial direction. Alternatively, the pin receiving member may be configured to approach or slide against the outer peripheral surface of the rotary pulse plate. Further, the rotary shaft holding means and the pin receiving member may be arranged on both sides of the rotary pulse plate, or the rotary shaft holding means and the pin receiving member may be arranged on one side of the rotary pulse plate.
Further, it is also possible that one member has the functions of the pin receiving member and the rotary shaft holding member.

Preferably, a sealed space is formed between the rotating shaft holding member and the pin receiving member, which are coupled to each other, and the rotating pulse plate is housed in this space.

In the above structure, since the rotary pulse plate is housed in the sealed space between the rotary shaft holding member and the pin receiving member, the rotary pulse plate is formed by the rotary shaft holding member and the pin receiving member. It is cut off from the outside. External dust and dirt will not enter the sealed space.
Therefore, dust or the like from the outside does not adhere to the rotation pulse plate, so that the detection accuracy of the rotation detection mechanism is further improved.

Preferably, the pin receiving member further has a shaft hole for supporting the rotating shaft of the rotating pulse plate.

In the above structure, the relative position between the rotary pulse plate and the conductive pin is determined by the shaft hole and the through hole of the pin receiving member. It is relatively easy to accurately process the relative positions of the holes. When the relative positional accuracy between the rotary pulse plate and the conductive pin is high, the error of the pulse signal generated by the rotation of the rotary pulse plate is reduced. Therefore,
With a simple structure, the accuracy of the rotation detection mechanism can be further improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A rotation detecting mechanism according to an embodiment of the present invention shown in FIGS. 1 to 10 will be described in detail below.

The rotation detection / detection mechanism 1 can detect the rotation direction and the rotation amount of the operation ring of the power zoom lens of the camera. This rotation detection mechanism 1
As shown in the perspective view of FIG. 1, generally, the rotary member 10, the gear 18, the rotary shaft holding member 20, and the pin receiving member 40.
And the first, second and third pins 30, 32, 34, the spring member 50, and the fixing screws 70, 72.

The gear 18 has one end 12a of the rotary shaft 12, that is, the shaft end 1 opposite to the pulse surface 16 of the pulse plate 14.
It is fixed to 2a.

The rotary shaft holding member 20 is a substantially rectangular plate-shaped insulating member, and has a pulse plate housing groove 22 formed in a cylindrical shape on one surface thereof, and a shaft hole 24 penetrating therethrough is formed in the center thereof.
Having. A projection 23a is formed on the groove bottom surface 23 of the pulse plate housing groove 22. Engagement grooves 26 are cut out on both left and right sides of the rotary shaft holding member 20. Positioning holes 28 are formed in the upper two corners of the rotary shaft holding member 20, and screw holes 29 are formed in the lower two corners of the rotary shaft holding member 40.

The pin receiving member 40 is an insulating member, and has a body portion 44 having a substantially rectangular plate shape, and mounting flanges having a substantially rectangular plate shape fixed to the left and right sides of the body portion 44 at right angles to the body portion 44. 41 and. The body portion 44 has first, second and third pin holes 46a, 46b,
46c and a shaft hole 47 are formed at predetermined positions. The main body 44 has positioning holes 48 penetrating through the upper two corners thereof, and through holes 49 are formed through the lower two corners thereof. In addition, the main body has a mounting flange 4
An engaging portion 45 that engages with the engaging groove 26 of the rotary shaft holding member 20 is provided in the vicinity of 1. The mounting flange 41 has a through hole 42 penetrating in the same direction as the extending direction of the main body 44.

First, second and third pins 30, 32, 34
Is a conductive member that is slidably inserted into the first, second and third pin holes 46a, 46b and 46c of the main body 44 of the pin receiving member 40.

The leaf spring member 50 includes a body portion 52, a first
The second and third leaf springs 60, 62, 64 and the first, second and third terminals 66, 67, 68 are members integrally formed by insert molding.

The main body 52 is a generally U-shaped insulating member, and has a generally columnar bottom portion 58, and generally columnar left and right portions 54 and 56 extending from both ends of the bottom portion 58 at right angles. . Positioning protrusions 55 and 57 that project in the vertical direction with respect to the bottom portion 58, the left portion 54 and the right portion 56 are provided at the ends of the left portion 54 and the right portion 56 opposite to the bottom portion 58. The bottom portion 58 has a through hole 59 penetrating both left and right ends thereof.
Having.

First, second and third leaf springs 60, 62, 6
4 is supported on the bottom part 58 and is on the upper part, that is, on the left part 54.
And extending in the same direction as the right part 56. As shown in the front view of FIG. 3, the first and second leaf springs 60, 62 are generally L-shaped plate-shaped conductive members, and are formed by the first pieces 60a, 62a and the second pieces 60a, 62a connected at right angles. It consists of pieces 60b and 62b.
First pieces 60a, 62a of the first and second leaf springs 60, 62
Has one end fixed to the bottom portion 58 adjacent to the left portion 54 or the right portion 56 of the main body 52, and the other end having the second piece 60b,
It is connected at a right angle to one end of 62b. Second piece 60b, 6
The other ends of 2b are oriented toward each other and the free end 6
It is 0x and 62x. The third plate spring 64 is a substantially ω-shaped plate-shaped conductive member, and is formed by connecting a left piece 64a, a right piece 64b, an upper piece 64c, and a central piece 64d. For more information,
The bottom portion 5 of the main body 52 is arranged so that one ends of the left piece 64a and the right piece 64b are located inside the first and second leaf springs 60, 62.
The upper end of the upper piece 62c is fixed to the upper piece 62c. One end of the central piece 64d is connected to the center of the upper piece 64c, and the central piece 64d extends downward, that is, extends toward the bottom portion 54 of the main body 52, and the other end is a free end 64x.

First, second and third terminals 66, 67, 68
Is a conductive member fixed to a lower portion of the bottom portion 54 of the main body portion 52, and includes the first, second and third leaf springs 6 respectively.
It is electrically connected to 0, 62, 64.

The rotation detecting mechanism 1 is assembled as shown in FIGS.

First, in the shaft hole 24 of the rotary shaft holding member 20,
The rotary shaft 12 of the rotary member 10 is inserted from the one end 12a side, and the pulse plate 14 of the rotary member 10 is housed in the pulse plate housing groove 22 of the rotary shaft holding member 20. At this time,
The pulse surface 16 of the pulse plate 14 is opposite to the bottom surface 23 of the pulse plate housing groove 22 of the rotary shaft holding member 20.

Next, the pin receiving member 40 is placed on the rotary shaft holding member 20. At this time, the other end 12 a of the rotary shaft 12 of the rotary member 10 is inserted into the shaft hole 47 of the pin receiving member 40. Further, the engaging portion 45 of the pin receiving member 40 is engaged with the engaging groove 26 of the rotary shaft holding member 20.

Next, the first, second and third pins 30, 32, 34 are fitted into the first, second and third pin holes 46a, 46b, 46c of the pin receiving member 40 at their one ends 30a, 32a, 34a.
After inserting each from the side, the leaf spring member 50 is superposed on the pin receiving member 40. At this time, the positioning protrusions 55, 5 of the left portion 54 and the right portion 56 of the main body portion 52 of the leaf spring member 50.
7 penetrates the positioning hole 48 of the pin receiving member 40 and is press-fitted into the positioning hole 28 of the rotary shaft holding member 20.

Next, the fixing screws 70 and 72 are inserted through the through holes 59 in the bottom portion 58 of the body portion 52 of the leaf spring member 50. The fixing screws 70 and 72 penetrate the through hole 49 of the pin receiving member 40 and are screwed into the screw holes 29 of the rotary shaft holding member 20, and the rotary shaft holding member 20, the pin receiving member 40, and the leaf spring member. 50 and 50 are integrally fixed. Then, the gear 18 is fixed to the one end 12a of the rotating shaft 12 of the rotating member 10 exposed to the outside.

When the rotation detecting mechanism 1 is assembled as described above, the rotary member 10 is rotatably held by the shaft hole 24 of the rotary shaft holding member 20 and the shaft hole 47 of the pin receiving member 40. The pulse plate 14 of the rotating member 10 is generally sealed between the rotating shaft holding member 20 and the pin receiving member 40, as shown in the sectional views of FIGS. 4 and 5. Pulse plate 14
Is sealed, so that dust, dirt and the like from the outside are prevented from adhering to the pulse plate.

On the pulse surface 16 of the pulse plate 14, the first, second and third pins 3 inserted into the pin receiving member 40 are inserted.
One ends 30a, 32a, 34a of 0, 32, 34 contact each other. The other ends 30b, 3 of the first, second and third pins 30,32,34
The portions of the leaf spring member 50 in the vicinity of the free ends 60x, 62x, 64x of the first, second and third leaf springs 60, 62, 64 contact the 2b, 34b. First, second and third pins 30,
32, 34 are first, second and third leaf springs 60, 62,
64 urges the pulse plate 14 in the direction of the pulse surface 16. As a result, the first, second and third pins 30,
32 and 34 are in stable contact with the pulse surface 16 of the pulse plate 14. The surface of the pulse plate 14 opposite to the pulse surface 16 is the pulse plate housing groove 2 of the rotary shaft holding member 20.
Since it slidably contacts the protrusion 23a of the groove bottom surface 23 of the second groove, even if it is urged by the first, second and third pins 30, 32, 34, the axial runout does not occur. In addition,
The first, second and third pins 30, 32, 34 are pulse plane 1
6, the pulse surface 16 may have some irregularities, but preferably the pulse surface 16 is a smooth surface.

Also, the first, second and third pins 30, 3
The positions of 2, 34 and the pulse plate 14 are the same as those of the pin receiving member 40.
Formed in the first, second and third pin holes 46a, 46b,
It is determined by the positions of 46c and the shaft hole 47. That is, the position of the contact point between the first, second and third pins 30, 32, 34 and the pulse surface 16 of the pulse plate 14 is determined by the hole position of the pin receiving member 40.
Generally, in drilling holes, it is easy to improve the precision of the hole position. Therefore, the positional accuracy of the contact points of the conductive pins 30, 32, 34 with respect to the pulse surface 16 can be improved.

Also, the first, second and third leaf springs 60,
62 and 64 are longer from the respective fixing portions of the leaf spring member 50 to the contact portions with the first, second and third pins 30, 32 and 34. Therefore, the first, second, and third leaf springs 60, 62, 64 may differ due to processing errors and assembly errors of parts.
Even if the amount of deflection when the abuts against the first, second and third pins 30, 32, 34 changes, the change in the biasing force is relatively small. That is, the first, second and third pins 30, 32,
The urging force for urging 34 is constant. Therefore, the rotation detection mechanism 1 operates stably and the detection accuracy is improved.

Further, as shown in FIG. 3, the first and second
Since the third leaf springs 60, 62 and 64 extend substantially above the pulse surface 16 of the pulse plate 14, the rotation detection mechanism 1 can be downsized to the size of the pulse surface 16. .

Next, the structure of the rotation detecting mechanism 1 will be further described together with the operation thereof.

In the rotation detecting mechanism 1, when the gear 18 is rotated by the rotation transmission mechanism (not shown) connected to the rotation detection target, the pulse plate 14 is rotated. As a result, the first and second pins 30 and 32 alternately contact the conductive portion 16a and the insulating portion 16b of the pulse surface 16 of the pulse plate 14. On the other hand, the third pin 34 is connected to the common portion 1 of the pulse surface 16.
Always contact 6c. First, second and third pins 30,3
2, 34 are first, second and third leaf springs 60, 62, 6
Via the first, second and third terminals 66, 67, 68
Is electrically connected to Therefore, when the first or second pin 30, 32 comes into contact with the conductive portion 16a of the pulse surface 16, the first or second terminal 66, 67 and the third terminal 6
When the first or second pin 30 or 32 contacts the insulating portion 16b of the pulse surface 16, the first or second terminal 66 or 67 and the third terminal 68 are not electrically connected to each other. Since it becomes conductive, between the first terminal 66 and the third terminal 68 and the second terminal 66
A pulse signal can be obtained between the terminal 67 and the third terminal.

The first and second pin holes 46a and 46b of the pin receiving member 40 are formed so that the phases of these two pulse signals are shifted by about 90 degrees. That is, when one end 30a, 32a of the first or second pin 30, 32 is in contact with the boundary between the conductive portion 16a and the insulating portion 16b of the pulse surface 16 of the pulse plate 14, the second or first pin 32 is The first and second pin holes 46a of the pin receiving member 40, so that the one ends 32a, 30a of the pins 30, 30 come into contact with the center or near the center of the conductive portion 16a or the insulating portion 16b of the pulse surface 16 adjacent to this boundary. 46b is formed.

The two pulse signals thus shifted in phase are processed in the same manner as in the conventional method, and the rotation direction is detected.

Next, a method of attaching the rotation detecting mechanism 1 to the lens barrel 80 will be described with reference to FIGS.

As shown in the sectional view of FIG. 7 and the exploded perspective view of the essential parts of FIG. 8, the lens barrel 80 to which the rotation detecting mechanism 1 is fixed has an operating ring 82 fitted outside the fixed barrel 86. . The rotation detection mechanism 1 is attached to a mounting portion 88 provided at the end of the fixed barrel 86 of the lens barrel 80, and the gear 18 of the rotation detection mechanism 1 meshes with the gear 84 of the operation ring 82. As shown in the perspective view of the main part of FIG. 6, the end surface 82a of the operation ring 82 has a gear 8 over the entire circumference.
4 are formed. Each tooth surface of each gear 84, that is, each tooth groove, extends in the radial direction of the operation ring 82, as shown in the enlarged view of the main part of FIG. 6 (II). However, it is possible to form the gear 84 only on a part of the end surface 82a of the operation ring 82, or to form the operation ring 82 itself as a half-split member, for example.

The mounting flange 41 of the rotation detecting mechanism 1 is mounted on the mounting portion 88 of the fixed barrel 86 by using mounting screws 90, 92 and biasing springs 94, 96. The mounting flange 41 of the rotation detecting mechanism 1 has surfaces 41a, 41 on the side facing the mounting portion 88 of the fixed cylinder 86.
The second surface 41b relatively close to the gear 18 is recessed from the first surface 41a relatively far from the gear 18 because the second surface 41b is formed stepwise. The through hole 42 of the mounting flange 41 of the rotation detection mechanism 1 is formed on the second surface 41b side.

The rotation detecting mechanism 1 is configured such that the first surface 41a of the mounting flange 41 of the rotation detecting mechanism 1 abuts on the mounting surface 88a of the mounting portion 88 of the fixed barrel 86, and the mounting screws 90 and 92 and the bias spring. With 94 and 96,
It is attached. At this time, the second surface 41b of the mounting flange 41 of the rotation detection mechanism 1 is separated from the mounting surface 88a of the mounting portion 88 of the fixed barrel 86. The mounting screws 90 and 92 are the mounting flanges 4 of the rotation detection mechanism 1.
1 is inserted into the through hole 42 and the mounting portion 8 of the fixed cylinder 86 is attached.
It is fixed at 6. Lower surfaces 90a, 92a of the screw heads of the mounting screws 90, 92 and the third surface 41c of the mounting flange 41 of the rotation detection mechanism 1, that is, the mounting flange 41.
The biasing springs 94 and 96 are sandwiched between the fixed cylinder 86 and the surface 41c on the opposite side in a compressed state. Therefore, the biasing springs 94 and 96 bias the third surface 41c of the mounting flange 41 of the rotation detecting mechanism 1 toward the fixed cylinder 86.

As described above, the rotation detecting mechanism 1 fixed to the mounting portion 88 of the fixed cylinder 86 is in the designed normal state, as shown in the enlarged view of the main part of FIG. The entire first surface 41a of the mounting flange 41 of the above abuts the mounting portion 88 of the fixed cylinder 86, and the rotation detection mechanism 1
A gap is formed in parallel between the second surface 41b of the mounting flange 41 and the mounting portion 88 of the fixed cylinder 86.
The rotation shaft 12 of the rotation detection mechanism 1 extends in the direction perpendicular to the optical axis, and the gear 18 of the rotation detection mechanism 1 meshes with the gear 84 of the operation ring 82 in parallel, that is, without inclination.

On the other hand, when the gear 18 of the rotation detecting mechanism 1 and the gear 84 of the operation ring 82 become wider than the normal state due to a processing error or an assembly error of the parts, for example, as shown in an enlarged view of an essential part of FIG. In addition, in the rotation detecting mechanism 1, the second cylinder 41c side of the third flange 41c of the mounting flange 41 is urged by the urging springs 94, 96, so that the fixed cylinder 8
9 is tilted from the normal state of FIG. 9 around the edge of the first surface 41a of the mounting flange 41 that abuts the mounting surface 88a of the mounting portion 88. Then, the rotation shaft 12 of the rotation detection mechanism 1 tilts, and the gear 18 fixed to the one end 12a of the rotation shaft 12 plays while tilting to the gear 84 of the operation ring 82.
That is, it comes to mesh without backlash.

On the contrary, when the distance between the gear 18 of the rotation detecting mechanism 1 and the gear 84 of the operation ring 82 becomes narrower than the normal state,
The gear 84 of the operation ring 82 pushes the gear 18 of the rotation detection mechanism 1 against the urging force of the urging springs 94 and 96.
As a result, the rotation detection mechanism 1 rotates in a direction opposite to the case of FIG. 10 around a part, that is, the edge of the first surface 41a of the mounting flange 41 that abuts the mounting surface 88a of the mounting portion 88 of the fixed cylinder 86. And then lean. At this time, the rotation shaft 12 of the rotation detection mechanism 1 tilts and one end 12 of the rotation shaft 12
The gear 18 fixed to a comes into mesh with the gear 84 of the operation ring 82 without tilting while inclining to the gear 84.

Therefore, the gear 18 of the rotation detecting mechanism 1 and the gear 84 of the operating ring 82 always mesh with each other without backlash even if an error occurs in machining / assembly.
Rotation is transmitted from the operation ring 82 to the rotation transmission mechanism 1 without delay in transmission.

Incidentally, instead of the above structure, a structure as shown in FIG. 11 may be adopted. That is, a flat contact surface 85 is formed on the end surface 82a of the operation ring 82 instead of forming the gear 84. On the other hand, the rotation member 1 of the rotation detection mechanism 1
A friction wheel 19 is fixed to one end 12a of the rotary shaft 12 of 0 instead of the gear 18. The other configurations are similar to those described above. Even in this case, the contact surface 85 of the operation ring 82 and the friction wheel 19 of the rotation detection mechanism 1 are brought into frictional contact with each other by the appropriate biasing force of the biasing springs 94 and 96 without delay in rotation transmission. Can be configured to.

The present invention is not limited to the above embodiment, but can be implemented in various other modes. For example, for a pulse plate that moves linearly, a pin receiving member having a pin hole may be used, and a pin that contacts the pulse surface of the pulse plate may be supported by the pin hole of the pin receiving member.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a rotation detection mechanism of the present invention.

FIG. 2 is a rear view of the rotation detection mechanism of FIG.

3 is a front view of the rotation detecting mechanism of FIG. 1. FIG.

FIG. 4 is a cross-sectional view taken along the general line IV-IV in FIG.

5 is a cross-sectional view taken along the general line VV of FIG.

FIG. 6 is a perspective view of a main part of an operation ring.

FIG. 7 is a sectional view of a main part of a lens barrel.

FIG. 8 is an exploded perspective view of essential parts showing the attachment of the rotation detection mechanism.

FIG. 9 is an enlarged sectional view of a main part of a lens barrel.

FIG. 10 is an enlarged cross-sectional view of a main part of a lens barrel.

FIG. 11 is an exploded perspective view of an essential part showing attachment of a rotation detection mechanism of a modified example.

FIG. 12 is a plan view of a main part of a conventional rotation detection mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotation detection mechanism 10 rotating member 12 rotating shaft 12a one end 12b other end 14 pulse plate (rotating pulse plate) 16 pulse surface 16a conductive part 16b insulating part 16c common part 18 gear wheel 19 friction wheel 20 rotating shaft holding member 22 rotating pulse plate storage Groove (space) 23 Groove bottom 23a Protrusion 24 Shaft hole 26 Engagement groove 28 Positioning hole 29 Screw hole 30 First pin (conductive member, conductive pin) 30a One end 30b Other end 32 Second pin (conductive member, conductive pin) 32a One end 32b Other end 34 Third pin 34a One end 34b Other end 40 Pin receiving member 41 Mounting flange 41a First surface 41b Second surface 41c Third surface 42 Through hole 46a First pin hole (through hole) 46b Second pin hole ( Through hole) 46c Third pin hole 47 Shaft hole 48 Positioning hole 49 Through hole 50 Spring fixing member 52 Main body 54 Left part 55 Positioning protrusion 56 Right part 57 Position Determining protrusion 58 Bottom 59 Through hole 60 First spring (conductive member, conductive spring member) 60a First piece 60b Second piece 60x Free end 62 Second spring (conductive member, conductive spring member) 62a First piece 62a Second piece 62x free end 64 third spring 64a left piece 64b right piece 64c upper piece 64d center piece 64x free end 66 first terminal 67 second terminal 68 third terminal 70,72 fixing screw 80 lens barrel 82 operation ring 82a end surface 84 gear 85 abutment surface 86 fixed cylinder 88 mounting portion 88a mounting surface 90 mounting screw 90a lower surface 92 mounting screw 92a lower surface 94,96 bias spring

Claims (3)

[Claims] 1. A rotation detecting mechanism (1) comprising a conductive member (30, 32, 60, 62) in contact with a pulse surface (16) of a rotating pulse plate (14), comprising: A rotary shaft holding member (20) for supporting the rotary shaft (12) and a pin receiving member (40) having a facing surface that closely faces and faces the entire pulse surface (16) of the rotary pulse plate (14). And a pin receiving member having a through hole (46a, 46b) which is opened facing the pulse surface (16) of the rotary pulse plate (14) and penetrates in a direction substantially perpendicular to the pulse surface (16). (40) and the through hole (46a, 46b) of the pin receiving member (40), one end (30a, 32a) of which is the rotary pulse plate (14).
Of the conductive pin (30, 32), which is in contact with the pulse surface (16) and has the other end (30b, 32b) protruding from the through hole (46a, 46b) of the pin receiving member (40), The other end (30b, 30b) of the conductive pin (30, 32) protruding from the through hole (46a, 46b) of the member (40).
A spring fixing member (50) to which a conductive spring member (60, 62) is fixed, which abuts the conductive pin (30, 32) against the pulse surface (16) of the rotary pulse plate (14). )
A rotation direction detecting mechanism, characterized in that the rotation shaft holding member (20), the pin receiving member (40) and the spring fixing member (50) are integrally connected. 2. A sealed space (2) between the rotary shaft holding member (20) and the pin receiving member (40) to be connected.
2) is formed, and the rotating pulse plate (14) is formed in the space (22).
The rotation direction detection mechanism according to claim 1, wherein the rotation direction detection mechanism is stored. 3. The pin receiving member (40) has a shaft hole (47) for supporting the rotary shaft (12) of the rotary pulse plate (14).
4. The method according to claim 1, 2 or 3, further comprising:
The rotation direction detection mechanism described.