JP2001324749A - Image pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a driving mechanism for performing a power varying operation of an optical finder synchronously with a photographing optical system small in size and low in cost. SOLUTION: The image pickup device capable of varying the focal distance of the photographing optical system and equipped with an optical finder is provided with a moving cam ring 34 which is moved along a 1st prescribed path in accordance with the power varying operation of the photographing optical system, a finder cam plate 46 which is made movable along a 2nd prescribed path and for performing the power varying operation of the optical finer, and a tension spring 47 for moving the finder cam plate 46 along the 2nd prescribed path in accordance the movement of the moving cam ring 34 along the 1st prescribed path. Also the device is provided with an inhibiting means (end face 2f and guide end part 46d) for inhibiting the movement of the finder cam plate 46 along the 2nd prescribed path in a prescribed path range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging device,
In particular, the present invention relates to an imaging apparatus that can change the focal length of an imaging optical system and that includes an optical finder.

[0002]

2. Description of the Related Art Conventionally, in an optical viewfinder attached to a collapsible lens barrel type camera, a magnification change operation is performed in synchronization with a change in a focal length of a photographing optical system. Drives the cam from the driving mechanism of the photographic optical system via a transmission member such as a gear train, or detects the focal length of the photographic optical system, and drives the actuator according to the detected value to change the magnification of the optical finder. That was being done.

[0003]

However, in the above-described configuration in which the transmission member is interposed, the transmission member must be provided outside the lens barrel due to its structure, which is an adverse effect on miniaturization. Further, in the configuration using the above-mentioned conventional actuator, the number of components constituting the drive mechanism is increased, and there is a large problem in terms of cost as well as miniaturization.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an image pickup apparatus in which a drive mechanism for changing the magnification of an optical finder in synchronization with a photographing optical system is reduced in size and cost. The purpose is to provide.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a photographing optical system is provided in an image pickup apparatus having an optical finder and a focal length of a photographing optical system. A moving member that moves along a first predetermined path in accordance with a zooming operation of the system; a cam member that can move along a second predetermined path and performs a zooming operation of an optical finder;
Following means for moving the cam member along the second predetermined path in accordance with the movement of the moving member along the first predetermined path.

According to the second aspect of the present invention, even if the moving member moves along the first predetermined path, the second member can be moved.
Prohibiting means for prohibiting the movement of the cam member along the predetermined path in a predetermined path range.

According to a third aspect of the present invention, the predetermined path range corresponds to a case where the focal length of the photographing optical system is in a non-photographing area.

According to a fourth aspect of the present invention, the follower is constituted by an elastic member which urges the cam member in a predetermined direction to abut the moving member.

According to a fifth aspect of the present invention, the predetermined direction is a direction in which the focal length of the photographing optical system is on the wide angle side.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the structure of a lens barrel of a camera including a zoom position detecting device according to the present invention. 2 to 4 are central sectional views of a lens barrel portion.
2 shows the lens barrel at the retracted position, FIG. 3 shows the lens barrel at the wide (wide-angle) position, and FIG. 4 shows the lens barrel at the tele (telephoto) position. Less than,
This will be described with reference to FIGS.

Reference numeral 1 denotes a base which is a base of the lens barrel unit, and forms a structure of the lens barrel unit together with a fixed barrel 2 fixed to a front end thereof by screws. A first lens barrel 3 holds lenses 4 and 5. Also, three follower pins 6 each having a tapered portion at the tip are press-fitted to the outer peripheral side surface, and a cap 7 is fixed to the front surface by bonding.

Reference numeral 8 denotes a shutter unit.
0, 11, and 12 are held. The detailed configuration of the shutter unit 8 will be described with reference to FIG.

FIG. 5 is an exploded perspective view of the shutter unit 8.

In the drawing, two movable followers 81 integrally formed with two follower portions 13a each having a tapered portion at the tip and provided movably in the axial direction are provided on the outer peripheral portion of the drawing base plate 13. And a total of three followers are evenly arranged. The movable follower 81 is urged by a compression spring 80 (FIG. 3), thereby offsetting a mechanical gap to maintain accuracy.

Reference numerals 82 and 83 denote coils wound around bobbins. Magnetic fluxes generated by energizing the coils are magnets 87 and 89 formed integrally with arms 86 and 88 via yokes 84 and 85, respectively. , Respectively, to generate a magnetic rotational force. The rotation angles of the arm 86 and the arm 88 are respectively set to the openings 13 formed in the throttle base plate 13.
b, 13c, at both ends of which arms 86,
The arm 88 abuts against each arm 86a, 88a and stops rotating. At this time, the polarities of the magnets 87 and 89 are stopped at positions where the magnets 87 and 89 act as attractive forces of the magnets with respect to the yokes 84 and 85. Therefore, the state is maintained even after the energization of the coils 82 and 83 is stopped. Further, even when the rotation is reversed, the rotation angle is in the range shown in FIG. 6, so that the suction force is similarly exerted, and the stopped state is maintained even if no current flows through the coils 82 and 83. FIG. 6 shows magnets 8 for coils 82 and 83 and yokes 84 and 85.
It is the figure which showed the rotation angles of 7 and 89, respectively.

Returning to FIG. 5, reference numeral 90 denotes an aperture blade, and a shaft 86a provided on the arm of the arm 86 is inserted into an elongated hole 90a of the blade 90. The hole 90b of the blade 90
Is rotatably fitted to the shaft portion 13d of the drawing ground plate 13. The aperture shape of the aperture blade 90 is circular, and the amount of light is limited by further attaching an ND filter 91. This ND
The filter 91 is affixed in a high-density imaging device of a recent digital camera because the influence of diffraction cannot be ignored when the aperture diameter is small, and the image quality of an image formed may be degraded. Limits the amount of light without reducing image quality.

Reference numerals 92 and 93 denote shutter blades, and respective holes 92b and 93b are shaft portions 1 provided on the aperture base plate 13.
3e and 13f are rotatably fitted respectively. The shaft 88 a provided on the arm of the arm 88 is
2, 93 are inserted into elongated holes 92a, 93a.

Reference numeral 94 denotes a cap which holds and fixes the coils 82 and 83 and the yokes 84 and 85 between the drawn base plate 13 and the arm 86 (and the magnet 87) and the arm 8
8 (and the magnet 89) are rotatably held. 9
Reference numeral 6 denotes a case for preventing the blade 90 from falling off, and reference numeral 95 denotes a sheet for preventing interference between the blade 90 and the blades 92 and 93. An open stop 95a is provided at the center of the sheet 95.
When the aperture blade 90 is retracted, an open aperture is formed.

Referring back to FIGS. 1 to 4, reference numeral 14 denotes a third lens barrel holding a lens 15. The detailed configuration of the third lens barrel 14 will be described with reference to FIG.

FIG. 7 is a perspective view showing the structure of the third lens barrel 14.

The third lens barrel 14 is guided by a guide bar 16 and a guide shaft 1a provided on the base 1 (FIG. 1). The third group barrel 14 has a female screw held at its arm in the axial direction. The nut 17 (see also FIGS. 3 and 4) restricts the tension and is biased by a tension spring 18 in the retracting direction. The projections 14a of the third lens barrel 14 are fitted in the slits 17a provided in the nut 17, and the rotation is restricted.

Referring back to FIGS. 1 to 4, reference numeral 21 denotes a third group lens barrel 14.
Is a stepping motor for driving the motor. The detailed configuration of the step motor 21 will be described with reference to FIG.

FIG. 8 is an exploded perspective view showing the structure of the step motor 21.

In the figure, reference numeral 19 denotes a screw provided integrally with the magnet 20, and has a male screw portion screwed with the female screw portion of the nut 17.

In the stepping motor 21, a pair of yokes 2
2a, 23a and a coil 24a wound on a bobbin form a first stator piece, and a pair of yokes 22b,
23b and a coil 24b wound on a bobbin form a second stator piece, and these first and second stator pieces are arranged together with the yoke plate 25 so as to face linearly with the magnet 20 interposed therebetween. Then, the yoke plate 25 is screwed onto the base 1 (FIG. 1). Thereby, the step motor 21 is fixed to the base 1.

Returning to FIGS. 1 to 4, reference numeral 26 denotes a photo interrupter fixed to the base 1 and a slit plate 14b (FIG. 7) integrally fixed to the third lens barrel 14 It is arranged at a position where it can advance and retreat to the slit portion. 28 is a cap fixed to the base 1,
The distal end side of the guide bar 16 is fixed, and the screw 19 is rotatably held.

Reference numeral 29 denotes an image sensor, which is fixed and held by a holding plate 30 fixed to the base 1 by screws or the like. Reference numeral 31 denotes a flexible wiring board to which an image sensor 29 is soldered and supplies a photoelectrically converted image signal to a signal processing circuit described later. 32 is dustproof rubber, 33 is LPF
Both are fixed to the base 1 with an adhesive or the like.

The inner diameter portion of the fixed cylinder 2 has a cam groove 2a shown in FIG. 10, in which a metal follower pin 27 press-fitted into a moving cam ring 34 engages. The rotation of the movable cam ring 34 causes the cam groove 2a to move.
Along the optical axis. FIG. 10 is a diagram showing an engagement relationship between the fixed cylinder 2 and the moving cam ring 34.

Gear teeth 34a are provided on the outer periphery of the moving cam ring 34.
The zoom motor 35 is driven at a reduced speed by gears 36 to 41 as shown in FIG. FIG. 11 is a diagram illustrating a gear train of the zoom motor 35.

The gear 36 is provided with three blades 36a (FIG. 12) for detecting the rotation of the zoom motor 35, and the blades are engaged with photointerrupters 54 and 55 arranged at an angle of 150 degrees. Combine. This will be described later with reference to FIGS.

FIG. 14 shows the first lens barrel 3, the movable cam ring 34,
It is sectional drawing which shows arrangement | positioning relationship of the gear 41 etc.

In the figure, the material of the gear 41 and its shaft 43 is metal. A gasket 45 plated with nickel is affixed to the back surface of the exterior 44 of the main body. Since the gasket 45 has elasticity, the shaft 43 is in close contact with the exterior 44 via the gasket 45. The first lens barrel 3 and the moving cam ring 34 are made of molding resin mixed with carbon fibers for the purpose of increasing strength and providing electrical conductivity.

Returning to FIGS. 1 to 4, reference numeral 46 denotes a finder cam plate, on the surface of which are provided tapered cam grooves 46b and 46c for driving the finder lens for zooming. Follower unit (not shown) provided integrally with a compensator lens (not shown) constituting the finder lens
And a follower portion (not shown) provided integrally with a variator lens (not shown) also constituting the finder lens, is in sliding contact with the cam grooves 46b and 46c, respectively. On the back of the finder cam plate 46, the fixed cylinder 2
There is a key portion 46a that fits into the groove portion 2d provided in the
The key portion 46a rotates along the outer peripheral portion of the fixed cylinder 2. 4
7 is a tension spring, one of which is a finder cam plate 4
6, the other is fixed to the fixed cylinder 2, so that the finder cam plate 46 is always biased in the wide direction.

Inside the moving cam ring 34, there is a linear guide cylinder 4
2 is rotatably fitted, and a protrusion 42e provided on the straight guide cylinder 42 has a groove 2c provided on the fixed cylinder 2 (FIG. 1).
0) and does not rotate with respect to the fixed cylinder 2. The three projections 42f provided on the front surface of the linear guide cylinder 42 fit into the grooves 34e (FIG. 9) provided on the inner surface of the movable cam ring 34. For this reason, the straight guide cylinder 42 and the movable cam ring 34 move integrally in the optical axis direction while being free to rotate. FIG. 9 shows a straight guide cylinder 42.
FIG. 4 is a view showing an engagement relationship between the moving cam ring and the moving cam ring.

The metal follower pin 6 provided in the first lens barrel 3 engages with the cam groove 34b (FIG. 9) of the movable cam ring 34, and the first linear lens barrel 42 3 is engaged with a translation pin 3a (FIG. 9). The movement of the first lens barrel 3 in the rotation direction is restricted by the linear motion groove 42a, and when the movable cam ring 34 rotates, the first lens barrel 3 is extended in the optical axis direction.

Similarly, the shutter unit 8 also includes a cam groove 34c (FIG. 9) of the movable cam ring 34 and the linear guide cylinder 42.
The shutter unit 8 is movable only in the optical axis direction because the shutter unit 8 is engaged with the linear motion groove 42b and is regulated by the linear motion groove 42b. Therefore, when the movable cam ring 34 rotates, the shutter unit 8 is extended in the optical axis direction along the cam groove 34c (FIG. 9).

A collar 34d is provided on the outer periphery of the movable cam ring 34.
Is provided. While the movable cam ring 34 rotates and moves from the retracted position to the wide position, the collar 34d is
Is arranged on the object side with respect to the receiving portion 2b provided in FIG. And, between the wide and the tele, always the brim 34d
Are located on the object side of the receiving portion 2b. Therefore, when a shocking external force acts on the first lens barrel 3 and the movable cam ring 34 in a photographable state, the receiving part 2b provided on the inner periphery of the fixed cylinder 2 receives the external force, and the lens barrel falls off or is damaged. Can be prevented. Also, as shown in FIG. 12, the first group lens barrel 3, the moving cam ring 34, the zoom gear 41, the shaft 43, and the exterior 44 via the gasket 45 are electrically connected to each other. Since the components are connected to the ground of the electric circuit, even if static electricity is applied to the camera body, the electric circuit is not directly affected.

FIG. 18 is a block diagram showing an electric circuit for controlling the operation of the lens barrel of the camera constructed as described above.

In FIG. 18, an image signal photoelectrically converted by the image pickup device 29 is subjected to predetermined image processing such as color conversion and gamma processing by an image processing circuit 61 and is recorded in a memory 62 such as a card medium. The control unit 60 controls the entire camera, and controls the photo interrupters 54, 5 and 5 inside the lens barrel.
5. Monitor output signals from the photo interrupter 26, the photo interrupter 48 for detecting zoom reset (FIG. 1), etc., and perform distance measurement control, exposure control, and zoom control. The zoom motor 35 is driven. It also performs signal processing on the output signal and controls the memory 62.

Reference numeral 64 denotes an electrically erasable and recordable nonvolatile memory, for example, an EEPROM or the like. Reference numeral 63 denotes a volatile memory which can be electrically erased and recorded, and is used to store variables used on the camera. For example, an SRAM or the like is used. The on / off state of the power switch 65 is also input to the control unit 60.

Hereinafter, the processing operation of the control unit 60 will be described with reference to FIGS.

FIG. 19 is a flowchart showing the processing operation of the control unit 60 when the power switch 65 is turned on.

When the power is turned on (S001), it is determined whether or not the lens barrel is at the retracted position (S002). If the lens barrel is in the retracted position, as shown in FIG. 11, the zoom motor 35 is rotated to rotate the gear teeth 34a via the gears 36 to 41, and the movable cam ring 34 is rotated in the clockwise direction in FIG. It rotates in the rotation direction (S003). The cap 7 incorporated in the first lens barrel 3 starts to open. Further, the moving cam ring 3
4 is rotated and the lens barrel is in the initial position (zoom reset position)
It is determined whether or not it has been driven (S004).

Whether the lens barrel has been driven to the initial position or not is determined by a light shielding plate 42 provided at the bottom of the linear guide cylinder 42.
c (FIG. 1) is performed by shutting off the photointerrupter 48 adhered to the base 1. If a signal indicating the shutoff is not detected from the photointerrupter 48 within a predetermined time, the lens barrel is moved to the initial position (zoom). It is determined that it is not driven to the reset position (reset position), and predetermined error processing 1 is performed (S
100).

The gear 36 is provided with three blades.
4 and 55, the output signal is converted into a pulse, and the pulse is counted.
Is detected. On the other hand, the rotation speed of the zoom motor 35 at each of the wide, middle, and tele zoom positions of the lens barrel is stored in the nonvolatile memory 64 in advance based on the above-described initial position of the lens barrel. When the current pulse count matches the rotational speed at the desired zoom position stored in the non-volatile memory 64, it is determined that the lens barrel has reached the desired zoom position. Since such a position control of the lens barrel is performed, it is necessary to accurately count the number of rotations.

By the way, because of the influence of the inertia of the rotor and gears of the zoom motor 35, the zoom motor 35 cannot be stopped immediately when it is stopped. Control,
There is also a case where extra rotation is performed in the reverse rotation direction. Therefore, unless the rotation direction of the zoom motor 35 is taken into consideration, pulses cannot be accurately counted. As means for detecting the rotation direction, two photo interrupters 5
4, 55 are used.

FIGS. 12 and 13 are timing charts showing the output signal waveforms of the photo interrupters 54 and 55 and the output signal waveform of the photo interrupter 48 for determining the initial position. FIG. 12A shows the zoom motor 35.
FIG. 12B shows the output directions when the rotation direction of the zoom motor 35 is clockwise (CW), and FIG. 13B shows the output waveforms when the rotation direction of the zoom motor 35 is clockwise (CW). Is the zoom motor 35
Shows the respective output waveforms when the rotation direction is in the counterclockwise direction (CCW).

When the zoom motor 35 is turned clockwise (CW)
, As shown in FIG. 12 (B),
The output waveform of the photo-interrupter 55 is output with a quarter cycle ahead of the output waveform of the photo-interrupter 54.
When the zoom motor 35 is rotating in the counterclockwise direction (CCW), as shown in FIG. 13, the output waveform of the photo-interrupter 55 is delayed by 1/4 cycle from the output waveform of the photo-interrupter 54. Is output. Thus, the output of the photo interrupters 54 and 55 differs depending on the rotation direction. This difference is detected, and the rotation speed of the zoom motor 35 is accurately counted in consideration of the rotation direction of the zoom motor 35 thus obtained.

Returning to FIG. 19, if it is determined in step S004 that the lens barrel has been driven to the initial position (zoom reset position), the lens barrel is moved to the wide position (S005). This will be described with reference to FIGS.

FIGS. 15 to 17 are views showing the finder cam plate 46 at each operation position.

First, while the lens barrel moves from the collapsed position to immediately before the wide position, the finder cam plate 46 is pulled in the wide position direction by the tension spring 47 as shown in FIG. 2f is in contact with the finder plate guide end 46d, and the finder cam plate 46 is stopped irrespective of the rotational position of the lens barrel or the movable cam ring 34. When the lens barrel moves immediately before the wide position, as shown in FIG. 16, the projection 46a of the finder cam plate 46 and the projection 34e provided on the movable cam ring 34 start to abut. From just before the wide position to the telephoto position, as shown in FIG.
In any of the rotation positions of 4, the projection 46a of the finder cam plate 46 keeps abutting on the projection 34e of the movable cam ring 34 by the extension spring 47, so that the finder cam plate 46 is synchronized with the movable cam ring 34 together. Move.

Returning to FIG. 19, after the lens barrel has moved to the wide position, the stepping motor 21 is driven to move the third group lens barrel 14 evacuated from the retracted position to the initial position (reset position) (S006). ). When the step motor 21 is driven, the screw 19 rotates via the magnet 20, as shown in FIG. Since the nut 17 is regulated by the projection 14a of the third lens barrel 14 as described above, the nut 17 moves in the optical axis direction, and the third lens barrel 14 also moves in the optical axis direction following this.
Perform focus adjustment. The slit plate 14b (FIG. 7) enters or retracts from the slit portion of the photointerrupter 26 within the range of the operation stroke of the third lens barrel 14, and as a result, the output signal of the photointerrupter 26 switches. Then, the count value of the counter that detects the number of steps of the step motor 21 is reset, and the movement of the third lens barrel 14 to the initial position is completed.

At this time, it is determined whether the third lens barrel 14 has been moved to the initial position (reset position) within a predetermined time (S007). That is, it is determined whether or not the output signal of the photo interrupter 26 has been switched within a predetermined time. If not, it is determined that some trouble has occurred, and predetermined error processing 2 is performed (S101).

If it is determined in step S007 that the third lens group barrel 14 has been able to move to the initial position (reset position) within a predetermined time, the step motor 21 is driven, and the third lens group lens barrel 1 is driven.
4 is moved to the standby position at the time of the wide state, and the aperture, the white balance and the like are controlled in accordance with the brightness of the subject and the like, and the shooting preparation is completed (S008).

Thereafter, when the operator operates the zoom lever to the telephoto side, the control unit 60 starts driving the zoom motor 35 in the forward rotation direction and counts the number of rotations of the zoom motor 35. The control unit 60 controls the zoom motor 35 by monitoring the count value, and controls the first group lens barrel 3 and the shutter unit 8.
To move. At this time, the moving cam ring 34 is also moving at the same time.
The finder cam plate 46 biased to the fourth side also moves together (FIG. 17). As a result, the variator lens and compensator lens of the finder (not shown) are driven, and the magnification of the optical finder is changed according to the focal length of the photographing optical system.

The operator can select a desired zoom position by releasing the lever of the zoom operation unit. When the lever is released, the zoom operation is stopped and the zoom operation is stopped at the desired position.

FIG. 20 is a flowchart showing the processing operation of the control unit 60 when the power switch 65 is turned off.

When the operator turns off the power switch 65 (S010), the step motor 21 is driven to
The group lens barrel 14 is moved to the collapse standby position (S011), and thereafter, the zoom motor 35 is driven to drive the lens barrel in the collapse direction. When the lens barrel is moved to the retracted position side from the wide position, the guide end 46 d of the finder cam plate 46 is moved.
Abuts against the end face 2f of the groove 2d of the fixed cylinder 2, and the finder cam plate 46 cannot move any more. The contact between the projection 46a of the finder cam plate 46 and the projection 34e of the movable cam ring 34 is released, and the movable cam ring 34 is retracted along the cam groove 2a provided on the inner surface of the fixed cylinder 2. Conventionally, since the finder cam plate 46 and the movable cam ring 34 always move in synchronization with each other,
The range in which the cam groove 2a is required is the range from the retracted position to the telephoto position, whereas in the present embodiment,
The range from immediately before the wide position to the telephoto position, in which the cam groove 2a is required, can be reduced. Further, since the range in which the finder cam plate 46 is driven is small, the diameter of the third lens barrel 14 can be reduced.

Next, in order to detect the completion of the movement to the zoom reset position, the switching of the output signal of the photointerrupter 48 is monitored (S012). If the output signal cannot be detected within a predetermined time, the process proceeds to step S015. Predetermined error processing 1 similar to step S100 of step 19 is performed.

On the other hand, if the switching of the output signal of the photo interrupter 48 can be detected within the predetermined time, the flow advances to step S013 to drive the zoom motor 35 to move the lens barrel to the retracted position. Thereafter, an electrical termination process is performed, and the power is turned off (S014).

[0062]

As described in detail above, according to the first aspect of the present invention, the image pickup apparatus is provided with a moving member that moves along a first predetermined path in accordance with a zooming operation of the photographing optical system, and a second predetermined member. A cam member that is movable along a path and performs a zooming operation of an optical finder; and moves the cam member along the second predetermined path according to movement of the moving member along the first predetermined path. And a follow-up means.

According to the second aspect of the present invention, even if the moving member moves along the first predetermined path,
The image forming apparatus further includes a prohibiting unit that prohibits the movement of the cam member along the second predetermined path in a predetermined path range.

As a result, the cam member (finder cam plate 46) and the moving member (moving cam ring 34) have always been moved synchronously together, so that the inner diameter of the fixed cylinder (2) is moved from the collapsed position to the inner diameter. The cam groove (2
In contrast to the requirement of a), in the present invention, it is sufficient that the cam groove 2a has a range from immediately before the wide position to the telephoto position, and the range in which the cam groove is required can be reduced. Further, a cam member (finder cam plate 46)
Is also small, so that the diameter of the third lens barrel 14 can be reduced.

As a result, it is possible to reduce the size and cost of the drive mechanism for performing the zooming operation of the optical finder in synchronization with the photographing optical system.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a lens barrel portion of a camera including a zoom position detection device according to the present invention.

FIG. 2 is a central sectional view showing a lens barrel portion at a retracted position.

FIG. 3 is a central sectional view showing a lens barrel portion at a wide (wide-angle) position.

FIG. 4 is a central sectional view showing a lens barrel portion at a tele (telephoto) position.

FIG. 5 is an exploded perspective view of a shutter unit.

FIG. 6 is a diagram showing a rotation angle of a magnet with respect to a coil and a yoke.

FIG. 7 is a perspective view showing a configuration of a third lens barrel.

FIG. 8 is an exploded perspective view showing a configuration of a step motor.

FIG. 9 is a diagram illustrating an engagement relationship between a straight guide cylinder and a movable cam ring.

FIG. 10 is a view showing an engagement relationship between a fixed cylinder and a movable cam ring.

FIG. 11 is a diagram showing a gear train of a zoom motor.

12A is a diagram illustrating a rotation direction of a zoom motor and an arrangement of a photo interrupter with respect to the zoom motor. FIG. 12B is a diagram illustrating each case where the rotation direction of the zoom motor is a clockwise direction (CW). 6 is a timing chart showing an output signal waveform of a photo interrupter.

FIG. 13 is a timing chart showing output signal waveforms of each photointerrupter when the rotation direction of the zoom motor is counterclockwise (CCW).

FIG. 14 is a cross-sectional view showing an arrangement relationship of a first lens barrel, a moving cam ring, a gear, and the like.

FIG. 15 is a view showing the finder cam plate in a first operation position.

FIG. 16 is a view showing the finder cam plate in a second operation position.

FIG. 17 is a view showing the finder cam plate in a third operation position.

FIG. 18 is a block diagram showing an electric circuit for controlling the operation of the lens barrel of the camera shown in FIG.

FIG. 19 is a flowchart showing a processing operation of a control unit when a power switch is turned on.

FIG. 20 is a flowchart illustrating a processing operation of a control unit when a power switch is turned off.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base 2 fixed barrel 2 f end face (prohibiting means) 3 first-group barrel 8 shutter unit 14 third-group barrel 21 step motor 26 photointerrupter 29 image sensor 34 moving cam ring (moving member) 35 zoom motor 36 to 41 gear 42 straight ahead Guide cylinder 46 Finder cam plate (cam member) 46 d Guide end (prohibiting means) 47 Extension spring (following means) 48 photo interrupter 54 photo interrupter 55 photo interrupter 60 control unit 74 non-volatile memory

Claims (6)

[Claims] 1. An imaging device having an optical finder, wherein a focal length of an imaging optical system can be changed, and a moving member that moves on a first predetermined path in accordance with a zoom operation of the imaging optical system; A cam member that is movable along a predetermined path and performs a zooming operation of an optical finder; and moves the cam member along the second predetermined path according to movement of the moving member along the first predetermined path. An imaging apparatus comprising: a follower for causing the imager to follow. 2. A prohibition means for prohibiting movement of the cam member along the second predetermined path within a predetermined path range even if the moving member moves along the first predetermined path. The imaging device according to claim 1, further comprising: 3. The imaging apparatus according to claim 2, wherein the predetermined path range corresponds to a case where a focal length of the imaging optical system is in a non-imaging area. 4. The apparatus according to claim 1, wherein the follower comprises an elastic member which urges the cam member in a predetermined direction to abut the moving member. Imaging device. 5. The imaging apparatus according to claim 4, wherein the predetermined direction is a direction in which a focal length of the photographing optical system is on a wide angle side. 6. The moving member has a cylindrical shape, the first predetermined path has a circular shape along the cylindrical shape, and the cam member has at least a portion of another cylindrical shape along the cylindrical shape. The imaging device according to any one of claims 1 to 5, wherein the imaging device is configured to include a cam portion in at least a part thereof.