JPH0719716U - Lens barrel - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lens barrel which has a complicated function and which can be easily and accurately assembled. [Structure] Holding section 2 for holding lens L2, and fixed lens barrel 1
A lens barrel including a lens driving ring (cam ring) 4 and an operating ring (distance operating ring) 6, wherein a flange-shaped first protrusion 304 is provided on the outer peripheral surface of the fixed barrel 1. Set up. The operation ring 6 is provided with a second protrusion 14 that protrudes toward the inner peripheral side and faces the side surface of the first protrusion 304. The lens drive ring 4 is provided with a third protrusion 307 that protrudes toward the outer periphery and faces the side surface of the first protrusion 304. Then, a portion where the first protrusion 304 and the second protrusion 306 face each other,
In addition, a movable electrical contact including the brushes 14 and 17a and the conductor pattern is provided at a portion where the first protrusion 304 and the third protrusion 307 face each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens barrel having a plurality of parts and electrical contacts mounted thereon.

[0002]

[Prior art]

 Conventionally, in an autofocus (AF) camera system, an electrical means such as a ROM is installed in the lens barrel to hold lens-specific data such as a focal length, and the data is electrically connected to the camera body through an electrical contact. Mechanically, the rotational force of the motor in the camera body is mechanically transmitted to the lens barrel by means of coupling, etc., and the focusing optical system is moved in the direction of the optical axis by the amount obtained from the above data. AF operation is performed.

However, in recent years, the multifunctionalization of various functions in AF cameras has progressed, and along with this, a camera system has been developed in which not only the camera body but also the lens barrel has an independent drive function. . For example, a focus lock function that fixes the focusing optical system at a certain focus position, a focus preset function that stores a certain required focus position, an AF auxiliary function such as a function that automatically returns to that focus position, and an AF assist function. The lens barrel is equipped with a function that improves the operability of the function that automatically switches to manual focus (MF) when the distance control ring is turned during driving.

[0006] These components include not only a mechanical mechanism built in the lens barrel but also electric parts such as an encoder and a motor built in the lens barrel. For this reason, the lens barrel incorporates more complicated electric circuits such as these drive circuits and control circuits. Along with this, the mechanism of the lens barrel has become complicated.

An outline of the configuration of a conventional lens barrel having a complicated drive mechanism built therein will be described with reference to FIG. The optical system includes lens groups L1, L2, and L3. The lens groups L 1 and L 3 are fixed to the inner peripheral surface near both ends of the fixed barrel 101. Focusing optics The lens group L2 is held by the lens holding ring 102, and the lens holding ring 102 includes a pin 103 embedded in the lens holding ring 102 and a rectilinear groove 301 formed in the fixed lens barrel 101. By engaging, it is movably fitted to the inner peripheral surface of the fixed lens barrel 101.

A lens drive ring (hereinafter referred to as a cam ring) 104 is rotatably fitted on the outer peripheral side of the fixed lens barrel 101, and an operation ring (hereinafter referred to as a distance operation ring) 106 is rotatable outside. Is fitted to. A cam groove is provided in the cam ring 104 and is engaged with the pin 103. In addition, a pin 105 is planted in the fixed lens barrel 101 and engages with a groove provided in the cam ring 104 along the circumferential direction.

An encoder pattern 131 is fixed to a part of the fixed barrel 101. The brushes 132a and 132b attached to a part of the cam ring 104 slide on the encoder pattern 131 when the cam ring 104 rotates.

This portion will be further described with reference to FIG. The encoder pattern 131 is composed of five encoder patterns 131a to 131e arranged in parallel along the circumferential direction of the fixed barrel 101. The brush 132a is electrically connected to the clutch motor on the cam ring 104. Although not shown in FIG. 3, a control circuit is mounted on the fixed barrel 101. The control circuit is connected to the encoder patterns 131a to 131e. The control circuit supplies a drive current to the clutch motor 111 via the pattern 131a and the brush 132a to control the operation. Further, the control circuit detects the rotation angle of the cam ring 104 by detecting whether or not the patterns 131b to 131e are conducted via the brush 132b. The control circuit drives the clutch motor 111 to move the clutch shafts 107a and 107b to connect the cam ring 104 and the motor 110 when an autofocus (AF) instruction is received from a user by a switch (not shown). Then, based on the signal received from the camera body side, the motor 110 is driven to rotate the cam ring 104 and move the lens group L2 to the in-focus position. At this time, the rotation angle of the cam ring 104 is detected from the encoder patterns 131b to 131e.

Further, when the control circuit receives a manual focus (MF) instruction from the user, the control circuit drives the clutch motor 111 to move the clutch shafts 107 a and 107 b, and the distance operation ring 106 and the cam ring 104 are connected to each other. To connect. As a result, when the user rotates the distance operation ring 106, the cam ring 104 rotates and the lens unit L2 moves.

Further, when the control circuit receives the AF instruction capable of the MF interrupt, the control circuit switches to the above-mentioned AF and monitors whether or not the distance operation ring 106 is rotated by the encoder 114, and the distance operation ring 106 is detected. When it is detected that is turned, the MF is immediately switched to.

In addition to these functions, a focus lock function that fixes the focus optical system at a certain focus position, a focus preset function that stores a necessary focus position, and a function that automatically returns to that focus position A plurality of photo interrupters, motors, etc. are installed to operate the AF auxiliary functions such as.

A procedure for assembling the lens barrel shown in FIG. 3 will be briefly described. Although not shown in FIG. 3, the fixed barrel 101 is divided into a front portion that holds the lens groups L1 and L2 and a rear portion that holds the lens group L3. The front part and the rear part are connected by a seal part and are fixed by a fixing member. At the time of assembling, first, the components such as the lens groups L1 and L2, the cam ring 104, and the distance operation ring 106 are attached to the front portion of the fixed lens barrel 101. Next, while moving the rear part of the fixed lens barrel 101 in the optical axis direction, the fixed lens barrel 101 is connected to the front part through the seal part. At this time, in order to prevent the brushes 132a and 132b of the cam ring 104 from being deformed by being pushed in the optical axis direction from the rear part of the fixed lens barrel 101, the portions of the cam ring 104 supporting the brushes 132a and 132b are cam ringed. It is devised such as connecting the rear part of the fixed lens barrel while tilting it toward the central axis of 104.

[0013]

[Problems to be solved by the device]

 In the conventional techniques as described above, there is a problem that the function of the lens barrel increases and the structure becomes complicated. In other words, the number of parts to be assembled increases, the assembly time increases, and the work content becomes extremely complicated, resulting in poor assembly workability and reliability. In particular, regarding the part where the encoder pattern and the brush come into contact with each other, it was necessary to devise a device for preventing the brush from being deformed. As described above, when the number of parts increases and the assembling work becomes complicated, there are problems that the assembling accuracy is lowered, the manufacturing cost is increased, and the lens barrel becomes large.

Therefore, an object of the present invention is to provide a lens barrel which has a complicated function and can be easily and accurately assembled.

[0015]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a fixed lens barrel that movably holds a lens holding unit, a cam ring that is disposed outside the fixed lens barrel and that transmits a driving force to the lens holding unit, A lens barrel which is disposed further outside the cam ring and has a distance operation ring for receiving a rotational driving force from the outside and transmitting this force to the cam ring, the lens barrel being formed on the outer peripheral surface of the fixed lens barrel. A first protrusion protruding in a brim shape, a second protrusion protruding from an inner peripheral surface of the distance operation ring so as to face a side surface of the first protrusion, and the first protrusion. A third protrusion formed on the cam ring so as to face a side surface of the first protrusion, a portion where the first protrusion and the second protrusion face each other, and the first protrusion. In the portion where the portion and the third protruding portion face each other, the brush is arranged on one side and the other side is guided to the other side. A movable contact mechanism constructed by pattern is disposed, the Rukoto that have a one in which the first problem solving means.

In addition, the conductor pattern is a rigid printed circuit board, at least a part of which is a discontinuous pattern, and the discontinuous pattern is used for detecting a rotation angle of the cam ring. As a second means for solving the problem, the movable contact mechanism further includes a hard printed circuit board having a state detection means and a power supply means on the same surface of the board, and at least two state setting means. It is used as a means for solving the problem of item 3.

[0017]

[Action]

 In the present invention, the brim-shaped first protrusion is provided on the outer peripheral surface of the fixed lens barrel. With this, when assembling, insert the cam ring into the fixed lens barrel and insert the pin into the groove so that the first protrusion of the fixed lens barrel faces the third protrusion of the cam ring. By implanting in the fixed lens barrel, the fixed lens barrel and the cam ring are aligned in the optical axis direction. Further, by inserting the distance operation ring into the fitting portion of the fixed lens barrel so that the first protrusion and the second protrusion face each other, the fixed lens barrel and the distance operation ring are moved in the optical axis direction and the optical axis. Aligned in the direction perpendicular to the axis. Therefore, these positions can be easily aligned.

Further, a brush and a conductor pattern are further provided on a portion where the first protrusion portion and the second protrusion portion face each other and a portion where the first protrusion portion and the third protrusion portion face each other. A movable contact mechanism will be provided. For example, a conductor pattern is provided on the side surface of the first protrusion, and a brush is attached to the second and third protrusions. As a result, by aligning the fixed lens barrel, the distance operation ring, and the cam ring, the brush and the conductor pattern are aligned with each other, so that it is not necessary to separately align only the movable contact mechanism. Further, since the movable contact mechanism is provided on the side surface of the flange-shaped first protrusion provided along the circumferential direction of the fixed lens barrel, it is possible to insert the distance operation ring or the cam ring during assembly. , The brush of the encoder can be assembled accurately without any fear of deformation.

[0019]

【Example】

 An embodiment of the present invention will be described with reference to the drawings.

The configuration of the lens barrel of this embodiment will be described with reference to FIGS. 1 and 2.

The optical system of the lens barrel includes lens groups L1, L2, and L3. As shown in FIG. 1, the lens groups L1 and L3 are fixed to the inner peripheral surface of the fixed lens barrel 1 near both ends thereof. The diameter of the lens unit L1 is larger than the diameter of the lens units L2 and L3. Therefore, the diameter of the fixed barrel 1 is large on the lens group L1 side and small on the lens group L3 side.

Further, the fixed barrel 1 is divided into an outer barrel and an inner barrel in a portion holding the lens group L3. The lens unit L3 is held by the inner cylinder. The focusing optical lens group L2 is held by the lens holding ring 2, and the lens holding ring 2 includes a pin 3 implanted in the lens holding ring 2 and a straight groove 301 formed in the fixed lens barrel 1. By fitting, the fixed lens barrel 1 is fitted to the inner peripheral surface of the fixed lens barrel 1 so as to be movable only in the optical axis direction.

A cam ring 4 is rotatably fitted on the outer peripheral side of the fixed barrel 1. A cam groove 302 is provided in the cam ring 4 and is engaged with the pin 3. A pin 5 is planted in the fixed lens barrel 1 and engages with a groove 303 provided along the circumferential direction of the cam ring 4. A distance operation ring 6 is arranged outside the cam ring 4.

The cam ring 4 is rotationally driven by transmitting the rotational driving force of the motor 10 arranged between the inner barrel and the outer barrel of the fixed barrel 1 or the rotational force of the distance operating ring 6. The motor 10 is connected to a control circuit 20 (not shown in FIG. 1) mounted in the lens barrel and driven by an instruction from the control circuit 20. A segment gear 8 and a clutch 7 (not shown in FIG. 1) are arranged between the cam ring 4 and the motor 10. The clutch motor 11 disposed on the cam ring 4 is rotationally driven according to an instruction from the control circuit 20 to move the clutch shafts 7a and 7b of the clutch 7 in the optical axis direction. As a result, the clutch shafts 7a and 7b are connected to the segment gear 8 or the distance operation ring 6, and the driving force of the motor 10 or the distance operation ring 6 is transmitted to the cam ring 4.

As shown in FIGS. 1 and 2, a bayonet mount portion 1 a for connecting the lens barrel to the camera body 30 is formed at the end of the fixed barrel 1 on the lens group L 3 side.

The bayonet mount 1 a is provided with an electrical contact 16 connected to the control circuit 20. The electrical contact 16 contacts the electrical contact of the camera body 30 to electrically connect the control circuit 32 of the camera body 30 and the control circuit 20 of the lens barrel.

Between the portion of the fixed lens barrel 1 where the fixed lens barrel 1 holds the lens group L1 and the portion where the fixed lens barrel L2 holds, there is a collar-shaped first portion along the outer peripheral side circumferential direction. The projection part 304 of No. 1 is formed. A smooth substrate 18, which is a kind of a hard printed circuit board provided with an encoder pattern, is adhered to the surface of the first protrusion 304 on the cam ring 4 side. At the end of the cam ring 4 on the side of the first protrusion 304, a third protrusion 307 is formed by raising a part of the end in parallel with the first protrusion 304, and a brush is formed at this portion. 17a and 17b are mounted. A second protrusion 306 is provided on a part of the inner wall of the distance operation ring 6, and the brush 14 is mounted on the second protrusion 306. The brushes 14, 17a, 17b contact the smooth substrate 18 to form an encoder.

The configurations of the smooth substrate 18 and the brushes 14, 17a, 17b will be further described with reference to FIG. The smooth substrate 18 has a substantially donut shape in which the outer peripheral portion is circular and the inner peripheral portion has a fan-shaped protrusion toward the substrate center. Two encoder patterns 118a and 118b made of a conductor are arranged along the circumferential direction on the outer peripheral portion. Four encoder patterns 119, 120a, 120b, 120c, 120d are arranged on the fan-shaped protruding portion on the inner peripheral portion. The pattern 118a is a linear pattern, and the pattern 118b is a dashed pattern. The patterns 118a and 118b are connected to the control circuit 20, respectively. The brush 14 is a comb-shaped conductor brush having two teeth. With the rotation of the distance operation ring 6, the tooth tip portion of the brush 14 slides on the pattern 118b. The control circuit 20 detects whether or not the distance operation ring 6 has rotated by detecting whether or not the patterns 118a and 118b are in a conductive state via the brush 14.

The pattern 119 is a linear pattern and is connected to the control circuit 20.

The brush 17 a is connected to the clutch motor 11 and is always in contact with the pattern 119 regardless of whether the cam ring 4 is rotating or stopped, and the control signal of the control circuit 200 and Transfers drive power.

The pattern 120a is a linear pattern. The patterns 120b, 120c, and 120d are irregular broken line patterns. The patterns 120a, 120b, 120c, 120d are connected to the control circuit 20, respectively. The brush 17b is a comb-shaped conductor brush having four teeth. As the cam ring 4 rotates, the tooth tips of the brush 17b slide on the patterns 120a, 120b, 120c, 120d, respectively. The control circuit 20 detects the rotation angle of the cam ring 4 by detecting whether the pattern 120a and the patterns 120b, 120c, and 120d are in a conductive state via the brush 17b. Further, a switch 24 is arranged outside the fixed lens barrel 1 to accept switching of the focusing operation mode from the user. The switch 24 accepts an autofocus (AF) focusing mode, a manual focus (MF) focusing mode, and an AF focusing mode capable of interrupting MF focusing.

Further, in addition to the above-mentioned functions, the lens barrel of the present embodiment has a focus lock function for fixing the focusing optical system, a focus preset function for storing a specific focusing position, and a focusing position for the specific focusing position. An AF auxiliary function for automatically returning is mounted, and in order to realize these, a photo interrupter and a motor are attached in addition to the above-mentioned configuration, but description thereof will be omitted.

Next, the outline of the method of assembling the lens barrel of this embodiment will be briefly described.

Although not shown, the fixed lens barrel 1 is divided into a rear part that holds the lens group L3 and a front part that holds the lens groups L 1 and L2, and these are fitted together by a seal cage. They are connected by fixing with a fixing member. First, the smooth substrate 18 is bonded to the first protrusion 304 on the front of the fixed barrel 1. Next, the brushes 17a and 17b are fixed to the third protrusion 307 of the cam ring 4. The front part of the fixed barrel 1 is moved while moving the cam ring 4 from the end of the fixed barrel 1 that holds the lens unit L2 toward the end that holds the lens unit L1 in parallel to the optical axis. Then, cover the cam ring 4. At this time, the pin 5 is fitted in the groove 303 and is implanted in the fixed lens barrel so that the brushes 17a and 17b of the cam ring 4 are pressed against the smooth substrate 18 by an appropriate contact force. This completes the alignment of the cam ring 4 in the optical axis direction and the alignment of the brushes 17a, 17b with the patterns 119, 120a, 120b, 120c, 120d of the smooth substrate 18. The lens group L2 attached to the lens holding ring 2 is inserted into the fixed lens barrel 1 and the pin 3 is implanted. The lens unit L1 is fixed to the front part of the fixed barrel 1.

Next, a drive unit such as a clutch motor 11 and a clutch is attached to the cam ring 4.

The distance operation ring 6 to which the brush 14 is attached is moved in parallel to the optical axis from the end portion holding the lens group L2 at the front part of the fixed lens barrel 1 to the end portion holding the lens group L1. While doing so, the distance operation ring 6 is fitted to the fitting portion including the contact surface 1b with which the distance operation ring 6 formed on the front portion of the fixed barrel 1 abuts, and the rotary sliding surface 1c for rotation. In this case, the brush 14 of the distance operation ring 6 is brought into contact with the smooth substrate 18 with a predetermined pressing force, whereby the alignment of the distance operation ring 6 in the optical axis direction and the direction perpendicular to the optical axis is completed.

At the same time, the alignment of the brush 14 and the patterns 118a and 118b of the smooth substrate 18 is completed. The rear part of the fixed barrel 1 to which the lens unit L3, the motor 10 and the like are attached is connected to the front part by a seal part. As a result, the lens barrel is completed.

The operation when the lens barrel of this embodiment is connected to the camera body will be described with reference to FIG.

In this embodiment, the lens barrel is connected to the camera body 30 as shown in FIG. In addition to the optical system, the camera body 30 is equipped with a control circuit 32 and a focus detection device.

The control circuit 20 performs communication with the control circuit 32 of the camera body 30, confirmation of the setting state of the switch 24 provided on the lens barrel, drive control of various drive units, recognition of encoder signals, and the like. .

The communication method between the control circuit 20 in the lens barrel and the control circuit 32 in the camera body is a well-known technique in the related art, and a description thereof will be omitted here.

The focus detection device 31 of the camera body 30 detects the in-focus state. The control circuit 32 communicates with the control circuit 20 in the lens barrel, reads the lens-specific data stored in the storage circuit in the control circuit 20, and transmits various operating commands for instructing the lens barrel to operate. , And each part of the camera body 30 are controlled.

The user operates the focus operation mode switch 24 to set one of AF focus mode, MF focus mode, and MF interruptable AF focus mode. When the focus operation mode switch 24 receives the selection of the AF mode, the control circuit 20 sends a drive signal to the clutch motor 11 via the brush 17a of the encoder to position the shafts 7a and 7b on the gear 8 side, The cam ring 4 and the segment gear 8 are connected.

Next, the control circuit 20 rotates the motor 10. The rotational driving force of the motor 10 is transmitted via the segment gear 8 to rotate the cam ring 4. Due to the rotation of the cam ring 4, the pin 3 embedded in the lens holding ring 2 moves along the cam groove 302 of the cam ring 4 while being guided by the rectilinear groove 301 of the fixed lens barrel 1. As a result, the lens holding ring 2 moves back and forth along the optical axis, and the focusing optical lens group L2 moves to the focusing position.

The movement amount control at this time is performed as follows. The amount of movement of the focusing optical lens group L2 is calculated in the control circuit 32 from the output of the focus detection device 31 in the camera body 30 and the lens specific data transmitted from the control circuit 20, and the calculated amount is transmitted to the control circuit 20. . The control circuit 20 drives the motor 10 in accordance with this movement amount to move the focusing optical lens group L 2 in the optical axis direction to perform the focusing operation.

When the MF mode is selected by the focus operation mode switch 24, the control circuit 20 drives the clutch motor 11 to move the shafts 7a and 7b of the clutch 7, and the cam ring 4 and the distance operation ring 6 are driven. And are connected. As a result, when the user rotates the distance operation ring 6, the cam ring 4 rotates and the focusing optical lens group L2 moves back and forth along the optical axis.

When the MF interrupt enable AF mode is selected by the focus operation mode switch 24, the control circuit 20 constantly monitors the conduction state of the encoder patterns 118 a and 118 b via the brush 14, and the user operates the distance operation ring. When it is detected that 6 has been turned, that is, when the MF is operated, the control circuit 20 immediately drives the clutch motor 11, and the clutch 7 disconnects the cam ring 4 and the AF motor 10 from each other. By connecting the distance operation ring 6 with the distance operation ring 6, the MF focusing operation can be performed.

As described above, in this embodiment, the first protrusion 304 of the fixed lens barrel 1 is provided with the encoder pattern 118a and the like on the surface facing the cam ring 4 and the distance operation ring 6. As described above, by aligning the cam ring 4 and the distance operation ring 6 using the first protrusion 304, the alignment can be performed easily and accurately.

Further, since the smooth substrate 18 provided with the encoder pattern 118a and the like is arranged on the first protrusion 304, by aligning the cam ring 4 and the distance operation ring 6 with the encoder pattern 118a and the like. The brushes 14a, 17a, 17b are aligned. Therefore, it is not necessary to perform the alignment of the encoder separately from the alignment of the cam ring and the distance operation ring as in the conventional case. Further, since the smooth substrate 18 provided with the encoder pattern 118 and the like is arranged in the direction perpendicular to the optical axis, an unreasonable force is applied to the brushes 14, 17a and 17b when the cam ring 4 and the distance operation ring 6 are attached. Never join. Therefore, the brush is not deformed as in the conventional case and the contact pressure between the brush and the encoder is not varied, so that the assembling accuracy can be improved.

Further, in this embodiment, by disposing the smoothing substrate 18 provided with the encoder pattern in the direction perpendicular to the optical axis, the fixed lens barrel 1 can be used while the space occupied by the encoder in the optical axis direction is extremely small. It is possible to obtain a space for the difference in radius between the portion holding the lens unit L1 and the portion holding the lens unit L2. In the present embodiment, on the smooth substrate 18 arranged in this space, in addition to the pattern conventionally arranged as an encoder, the rotation of the distance operation ring 6 conventionally detected by the photo interrupter is detected. It was possible to mount the patterns 118a and 118b for doing so.

As a result, the space occupied by the conventional encoder in the optical axis direction and the space of the photo interrupter for detecting the rotation of the distance operation ring are arranged in the first protrusion and the smooth substrate which are arranged perpendicularly to the optical axis. It was possible to reduce the space to tighten. At the same time, since the number of parts can be reduced, the manufacturing cost can be reduced.

It is needless to say that the smooth substrate used in this embodiment can be replaced with a hard printed substrate such as a glass epoxy substrate, but it is desirable to use a smooth substrate as in this embodiment. If it is used, the contact torque is reduced and the current consumption for AF driving is reduced, which is also effective in extending the life of the battery.

Further, in the present embodiment, the first protrusion 304 and the smooth substrate 18 are provided at the end of the cam ring 4 on the lens group L1 side. However, the present invention is not limited to this position, and the lens L3 of the cam ring 4 is not limited to this position. It is of course also possible to place it on the side end.

[0054]

As described above, according to the present invention, the fixed lens barrel is provided with the first protrusion having a surface facing a part of the distance operation ring and the cam ring, and the first protrusion is provided on the first protrusion. By arranging the encoder, it is possible to obtain an effect that the assembling property is improved and the manufacturing cost is reduced. Further, since two or more encoders are put together in the same space, there is an effect of space saving.

[Brief description of drawings]

FIG. 1 is a sectional view of a lens barrel according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the operation of each component when the lens barrel of FIG. 1 is attached to the camera body.

FIG. 3 is a sectional view of a conventional lens barrel.

FIG. 4 is an explanatory diagram showing a configuration of an encoder attached to a first protrusion of the lens barrel of FIG.

5 is an explanatory diagram showing a configuration of an encoder of the lens barrel of FIG.

[Explanation of symbols]

1, 101 ... Fixed lens barrel, 1a, 101a ... Bayonet mount part, 2, 102 ... Lens holding member, 3, 103 ...
Pins 4, 104 ... Cam ring (lens drive ring) 5, 10
5 ... Pin, 6, 106 ... Distance operation ring (operation ring), 7, 1
07 ... Clutch, 7a, 7b, 107a, 107b ...
Shafts, 8, 108 ... Segment gears, 10, 110 ... Motors, 11, 111 ... Clutch motors, 14, 17a, 1
7b ... Brushes, 16, 116 ... Electrical contacts, 18 ... Smooth substrate (rigid printed circuit board), 20 ... Control device, 24 ... Focusing operation mode switch, 30 ... Camera body, 31 ... Focus detection device, 32 ... Control circuit, 114 ... Photointerrupters, 118a, 118b, 119, 120a, 120
b, 120c, 120d ... Encoder pattern, 13
1, 131a, 131b, 131c, 131d, 131
e ... Encoder pattern, 132a, 132b ... Brush, L1, L2, L3 ... Lens group.

Claims (3)

[Scope of utility model registration request] 1. A fixed lens barrel for movably holding a lens holding unit, a lens drive ring arranged outside the fixed lens barrel for transmitting a driving force to the lens holding unit, and further the lens drive ring. A lens barrel having an operating ring for receiving a rotational driving force from the outside and transmitting this force to a lens driving ring, the collar being formed on the outer peripheral surface of the fixed lens barrel. A protruding first protruding portion, a second protruding portion formed on the inner peripheral surface of the operation ring so as to face the side surface of the first protruding portion, and a side surface of the first protruding portion. A third protrusion formed on the lens driving ring so that the first protrusion and the second protrusion face each other, and the first protrusion and the third protrusion. A brush is arranged on one side and a conductor pattern is arranged on the other side in a portion facing the protrusion. And a movable contact mechanism configured by being arranged. 2. The conductor pattern is a rigid printed circuit board, at least a part of which is a discontinuous pattern,
The lens barrel according to claim 1, wherein the discontinuous pattern is used to detect a rotation angle of the lens driving ring. 3. The movable contact mechanism comprises a hard printed board having a state detecting means and a power supply means on the same surface of the board, and at least two state setting means. Lens barrel.